Outline of Water Quality Regulations - gesui.metro.tokyo.jp · PDF fileOutline of Water Quality Regulations ... u l s u b s t a n c e s ... Sewerage Law prescribes the facilities which

- Aiming for a comfortable Water Environment -

Industrial Wastewater

Outline of Water Quality Regulations

Bureau of Sewerage

Tokyo Metropolitan Government 【Photograph】

Tokyo Sky Tree visible from Kosuge Water Reclamation Center Tokyo Sky Tree is the highest broadcasting tower in the world. It reaches a height of 634meters. View from the observation deck is right superb including Mt.Fuji.

In Metropolitan Tokyo, the coverage of the sewerage system achieved

approximately 100% by the end of FY 1994, and virtually all domestic

wastewater and industrial wastewater is treated by the Water Reclamation

Centers. However, this does not mean that the problems of pollution of

Tokyo's rivers and sea areas (called as public water body) have been

completely solved. The current sewage treatment system was originally

intended for domestic sewage, and has difficulties in completely treating

wastewater from workplaces.

Also, discharging harmful substances into the sewerage system damage the

treatment capability of the Water Reclamation Centers.

In order to realize a pleasant water environment, the understanding and

cooperation of all companies regarding prevention of discharging harmful

substances and improvement of wastewater quality is necessary.

The Sewerage Law and the Tokyo Sewerage Ordinances provide water

quality regulations for wastewater containing harmful substances, etc. This

pamphlet explains the overall water quality regulations for wastewater when

using the public sewerage system.

※ In this brochure,

Workplace means a place which discharges wastewater

with business such as factory, restaurant, hospital,

university, institute, etc..

Specified facility means a facility which defined in

Sewerage Law .

Specified workplace means a workplace which has more

than one specified facility.

- Items subject to regulation and their effect on public sewerage system - Regulations regarding the water quality of wastewater discharged to the public sewerage system have been formulated from the point of view of conservation of public water areas, maintenance of sewerage facilities, etc. The items subject to regulation and the effect when discharged into the public sewerage system are as follows.

Items subject to regulation Effect on public sewerage system

Hydrogen ion concentration index(pH) Causes corrosion to the sewerage facilities. Harmful gases may be generated when mixed with other wastewater.

Biochemical oxygen demand (BOD) The treating function of the Water Reclamation Centers is reduced when the concentration is high.

Suspended solids (SS) Blocks sewage pipes. Normal-hexane extracts Blocks sewage pipes. Also is a fire hazard.

Nitrogen, Phosphorous The treating function of the Water Reclamation Centers is reduced when the concentration is high.

Cyanide Makes working within sewage pipes hazardous. Reduces the biological treating function in the Water Reclamation Centers.

Alkyl mercuric compound, organic phosphorous, lead, total mercury, cadmium, arsenic, hexavalent chromium, copper, zinc, total chromium, dissolved iron, dissolved manganese, polychlorinated biphenyls, selenium, boron

Reduces the biological treating function in Water Reclamation Centers. Makes treating and disposal of sludge arising from Water Reclamation Centers, etc., difficult.

Trichloroethylene, tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1-3-dichloropropene, thiuram, simazine, thiobencarb, benzene, fluorine, 1,4-dioxane,

Makes working within sewage pipes hazardous. Reduces the biological treating function in the Water Reclamation Centers.

Phenols Reduces the biological treating function in the Water Reclamation Centers.

Iodine consumption Causes corrosion to the sewage facilities. Makes working within sewage pipes hazardous by generating hydrogen sulfide gas.

Temperature Makes working within sewage pipes hazardous

Some Wastewater are not allowed to Discharge to the Public Sewerage System

(Note) The ability of microorganisms is used for treating sewage at the Water Reclamation Centers.

１

－1－

50ｍ3/day or more 50ｍ3/day or more Less than 50ｍ3/day0.03㎎/L or less 0.03㎎/L or less 0.03㎎/L or less

1㎎/L or less 1㎎/L or less 1㎎/L or less1㎎/L or less 1㎎/L or less 1㎎/L or less

0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less0.5㎎/L or less 0.5㎎/L or less 0.5㎎/L or less0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less

0.005㎎/L or less 0.005㎎/L or less 0.005㎎/L or lessNo detection No detection No detection

0.003㎎/L or less 0.003㎎/L or less 0.003㎎/L or less0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less0.2㎎/L or less 0.2㎎/L or less 0.2㎎/L or less

0.02㎎/L or less 0.02㎎/L or less 0.02㎎/L or less0.04㎎/L or less 0.04㎎/L or less 0.04㎎/L or less

1㎎/L or less 1㎎/L or less 1㎎/L or less0.4㎎/L or less 0.4㎎/L or less 0.4㎎/L or less

3㎎/L or less 3㎎/L or less 3㎎/L or less0.06㎎/L or less 0.06㎎/L or less 0.06㎎/L or less0.02㎎/L or less 0.02㎎/L or less 0.02㎎/L or less0.06㎎/L or less 0.06㎎/L or less 0.06㎎/L or less0.03㎎/L or less 0.03㎎/L or less 0.03㎎/L or less

0.2㎎/L or less 0.2㎎/L or less 0.2㎎/L or less0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less0.1㎎/L or less 0.1㎎/L or less 0.1㎎/L or less10㎎/L or less 10㎎/L or less 10㎎/L or less

230㎎/L or less 230㎎/L or less 230㎎/L or less8㎎/L or less 8㎎/L or less 8㎎/L or less

15㎎/L or less 15㎎/L or less 15㎎/L or less0.5㎎/L or less 0.5㎎/L or less 0.5㎎/L or less

2㎎/L or less 2㎎/L or less 2㎎/L or less 2㎎/L or less3㎎/L or less 3㎎ /L or less 3㎎/L or less 3㎎/L or less2㎎/L or less 2㎎ /L or less 2㎎/L or less 2㎎/L or less5㎎/L or less 5㎎ /L or less 5㎎/L or less ―

10㎎/L or less 10㎎/L or less 10㎎/L or less ―10㎎/L or less 10㎎/L or less 10㎎/L or less ―

Less than 600㎎/L Less than 600㎎/L(less than 300㎎/L) (Less than 300㎎/L)Less than 600㎎/L Less than 600㎎/L

(Less than 300㎎/L) (Less than 300㎎/L)Mineral oil 5㎎/L or less 5㎎/L or less ―

Animal and vegetable oils 30㎎/L or less 30㎎/L or less ―Less than 120㎎/L Less than 120㎎/L ―

Less than 16㎎/L Less than 16㎎/L ―Greater than 5 and less than 9 Greater than 5 and less than 9 Greater than 5 and less than 9

(Greater than 5.7 and less than 8.7) (Greater than 5.7 and less than 8.7) (Greater than 5.7 and less than 8.7)

Less than 45ﾟC Less than 45ﾟC Less than 45ﾟC(Less than 40ﾟC) (Less than 40ﾟC) (Less than 40ﾟC)

Less than 220㎎/L Less than 220㎎/L Less than 220㎎/L

3 The values within ( ) for BOD, SS, pH, and temperature apply to manufacturing industry and gas supply industry.

1,3-dichloropropene

1㎎/L or less

Selenium

0.02㎎/L or less

Harmful substances

Iodine consumption Less than 220㎎/L

(pH)

- Discharge standards to sewerage within the 23 wards in Tokyo (excludingdioxins) -

(Greater than 5.7 and less than 8.7)

TemperatureLess than 45ﾟC

(Less than 40ﾟC)

Greater than 5 and less than 9

Zinc

Fluorine

Total chromium

Boron

ThiobencarbBenzene

Copper

ThiuramSimazine

1,1,2-trichloroethane 0.06㎎/L or less

―

―

―

2㎎/L or less

8㎎/L or less15㎎/L or less

2㎎/L or less0.5㎎/L or less

10㎎/L or less230㎎/L or less

0.2㎎/L or less0.1㎎/L or less

3㎎/L or less

0.06㎎/L or less0.03㎎/L or less

――

PhenolsIron (dissolved)

―――

―(BOD)

(SS)―

PhorphorousHydrogen ion concentration

Manganese (dissolved)Biochemical oxygen demand

Normal-hexaneextracts

Nitrogen―

Suspended solids

2 Among , the criterion for total chromium applicable to the operator of a specified facility discharging less than 50ｍ3/day applies tooperators of factories or operators of specified workplaces established on or after 1st April 2001. The criteria for copper, zinc, phenols, iron, andmanganese apply to the operators of factories established on or after 2nd April 1972 or specified workplaces established on or after 1st April 2001.Factories are defined in Article 2-7 of "Environmental Ordinance to ensure the Health and Safety of Residents (Tokyo Municipal Ordinance No. 215,2000), and specified workplaces are defined in Article 8 of the same Ordinance.

Difficult to process substances

Items that

can be

processed

Environmental

items, etc.

Substance or item Less than 50ｍ3/dayCadmium 0.03㎎/L or less

Alkylmercuric compound

1,4-dioxane

Lead 0.1㎎/L or lessHexavalent chromium 0.5㎎/L or less

Cyanide 1㎎/L or lessOrganic phosphorous 1㎎/L or less

Dichloromethane 0.2㎎/L or less

Polychlorinated biphenyls 0.003㎎/L or less

Carbon tetrachloride

0.02㎎/L or less

(Notes)1 In the case of boron and fluorine, the upper box shows the discharge standard for public sewerage system discharging into rivers or other publicwater areas, and the lower box shows the exclusion criterion for public sewerage system discharging into the sea. (The standard differ depending onthe location.)

Person that has not installed a specifiedfacility in terms of the Water PollutionControl Law

As of 21st October 2015

No detection

Arsenic 0.1㎎/L or lessTotal mercury 0.005㎎/L or less

Applicable to Operator of specified facility　under theWater Pollution Control Law

Trichloroethylene 0.1㎎/L or lessTetrachloroethylene 0.1㎎/L or less

Cis-1,2-dichloroethylene 0.4㎎/L or less1,1,1-trichloroethane 3㎎/L or less

1,2-dichloroethane 0.04㎎/L or less1,1-dichloroethylene

0.1㎎/L or less

２

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Item

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－2－

- Discharge Standards to sewerage (dioxins)-

Issued 15th January 2000

(Note) pg means picogram, and TEQ is the abbreviation for toxic equivalent.

- Specified Facility in accordance with the Sewerage Law - Sewerage Law prescribes the facilities which ought to be regulated on the drainage quality. The facilities are as follows. A facility complying with 1 or 2 below that continuously discharges wastewater to the public sewerage system.

1 A specified facility defined by the Water Pollution Control Law

2 A facility for which the water quality of the wastewater is regulated by the Law on Special Measures concerning Countermeasures against Dioxins

- How to Observe the Discharge Standards -

To enable wastewater from workplaces to observe the discharge standards, first investigate the following items. 1 Ingenuity of manufacturing method, processes, etc. 2 Ingenuity of usage of chemicals and ingredients. In addition, reduction of the consumption. 3 To collect the waste fluid, and outsourse the disposal to waste disposal firm. If it is not possible to comply with the discharge standards by these methods, it is necessary to install a treatment facility to process the wastewater. Typical processing methods are shown on and after page 16.

- Wastewater that does not comply with the standards cannot be discharged - . . . A workplace that discharges wastewater not complying with the Sewerage Law can be punished (up

to 6 months' imprisonment or up to 500,000 yen fine. Up to 3 months' imprisonment or 200,000 yen fine in the case of an unintentional act). Also, in the case of a workplace that is considered to have the possibility of discharging wastewater that does not comply with these standards, an order may be issued to improve a specified facility, to temporarily stop using a specified facility, or to stop discharging to the public sewerage system.

. . . An order may be issued to a workplace that have discharged wastewater that does not comply with these standards to improve the quality of their wastewater, or to temporarily stop discharging to the public sewerage system.

Applicable to Operators of facilities subject to the water quality standard prescribed by the Law on Special Measures concerning Countermeasures against Dioxins

Standard 10pg-TEQ/L or less

３

－3－

- 1 Notification of commencement (change) of use of public sewerage system - When discharging wastewater to the public sewerage system, please submit a "Notification of Commencement of Use of Public Sewerage System" or a "Notification of Commencement (Change) of Use of Public Sewerage System" to the relevant Sewerage Office. After submission, submit a "Notification of Commencement (Change) of Use of Public Sewerage System" when there is a change in the quantity or quality of wastewater.

F . . . Notification by FAX Title of notification When it is necessary to submit F

Notification of Commencement (Change) of Use of Public Sewerage System

o When the quantity of wastewater discharged per day when the flow at maximum is 50 m3 or higher at maximum.

o When any of the items on the table of page 5 and 6 does not comply with the quality* of wastewater discharged to the public sewerage system

No

Notification of Commencement of Use of Public Sewerage System

o When installing specific facilities (only when the above is not applicable)

No

* Indicates the water quality before treating when a wastewater treating facility or treatment facility has already been installed.

- Categories of notification for specified facilities and treatment facilities – The categories of notification for specified facilities and treatment facilities are as follows. See pages 9 and 10 for more detailed information.

Specified workplace

(Workplace where specified facilities are

installed)

Non-specified workplaces

Notification regarding specified

facilities

Notification regarding treatment

facility

* A treatment facility is a facility to treat wastewater within on the discharge standards (page 5).

４

The Operators of Certain Workplaces are required to submit the Following Notifications

－4－

Formality examination (Required documents provided, no omissions, etc.)

Amendments requested for areas requiring amendment, and if cannot be

amended documents are returned.

When all items are formally provided

Examine whether it is possible to comply with the discharge

standards with the method of processing described in the

notification. 60 day period in whichcontent of the notificationis examined in detail When the content of the notification is

inappropriate, an order to change (or

abandon) the scheme or an instruction to

change the scheme may be issued.

When early commencement of construction

has been requested and approved by the

Bureau of Sewerage

Within 5 days

Submission of notification of

completion of construction

NotificationSubmission of

acceptance certificate Issuance of the

Order to change scheme

of construction Commencement

construction Completion of

of construction Early commencement

- Sequence of notification – The sequence of the notification procedures for installation or change of a specified facility or treatment facility is as follows.

When there has been a violation of the obligation to submit a notification

When there has been a violation of the obligation to submit a notification based on the law or the ordinances, punishment may be imposed. Example: For failing to notify regarding installation of a specified facility or falsifying the notification, up to 3 months’ imprisonment or a fine up to 200,000 yen may be imposed.

５

－5－

- 2 Notification regarding specified facilities - ● For specified facilities, the following notifications are required. Please submit to the relevant Sewerage Office. F . . . Notification by FAX Title of notification When notification is necessary Content of notification Deadline for notification F

１ Notification of installation of specified facility

When the operator of a workplace that continuously uses the public sewerage system for discharging sewage intends to install a specified facility on the workplace.

(1) (In the case of an individual) Name and address (in the case of a company) Name, address, and representative’s name (2) Name and location of workplace (3) Type of specified facility (4) Structure of specified facility (5) Method of use of specified facility (6) Method of processing wastewater discharged from the specified facility (7) Quantity and quality of wastewater discharged to the public sewerage system, water supply and wastewater system

Up to 60 days prior to the date of installation of the specified facility. Construction cannot commence until 60 days has passed after receipt of the notification. However, in some cases this period of time can be shortened.

No

２ Notification of use of specified facility

When the operator of a facility designated as a specified facility (including facilities under construction) uses the facility to continuously discharge wastewater from the workplace to the public sewerage system.

Within 30 days from the date of becoming a specified facility

No When a workplace where a specified facility is already installed starts to use the public sewerage system.

Within 30 days from the date of using the public sewerage system

３ Notification of change of structure, etc., of specified facility

When either of (4), (5), (6), or (7) of the “Content of notification” in 1 or 2 is to be changed.

Items to be changed

Up to 60 days prior to the date of change of structure, etc., of the specified facility. Construction cannot commence until 60 days has passed after receipt of the notification. However, in some cases this period of time can be shortened.

No

４ Notification of change of name, etc.

When either of (1) or (2) of the “Content of notification” in 1 or 2 is to be changed.

Items changed Within 30 days from the date of the change Yes

５ Notification of termination of use of specified facility

When terminating the use of a specified facility.

Specified facility terminated Within 30 days from the date of termination Yes

６ Notification of succession

When there is succession to the position of the person that had submitted the notification in 1 or 2.

Reason for the succession (transfer, lease, inheritance, merger, division)

Within 30 days from the date of succession. The person to submit the notification is the successor (transferee, inheritor, the company after merger, etc.)

Yes

７ Notification of completion of construction, etc.

Upon completion of construction, etc., of a specified facility concerning whose installation or change of structure, etc., a notification has been submitted.

Items completed Within 5 days from the date of completion Yes

６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７－6－






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７






No








Items to be changed


No











Yes




６７－7－

- 3 Notifications regarding treatment facilities - ●For treatment facilities the following notifications are required. Please submit to the relevant Sewerage Services Administration Office. F . . . Notification by FAX Title of notification When notification is necessary Content of notification Deadline for notification F

１

Notification of installation of new treatment facility and change to method of use

When a treatment facility is to be newly installed, expanded, modified, or its method of use is to be changed.

(1) (In the case of an individual) Name and address (in the case of a company) Name, address, and representatives name (2) Name and location of workplace (3) Outline of workplace (4) Structure and method of use of treatment facility ● Complete in the case of a new installation ● The relevant parts in the case of a notification of expansion, modification, or change of use

Up to 60 days prior to the date of installation of the new treatment facility or change of use. Construction cannot commence until 60 days has passed after receipt of the notification. However, in some cases this period of time can be shortened.

No

２ Notification of change of name, etc.

When either of (1), (2), or (3) of the “Content of notification” in 1 is to be changed.

Items changed Within 30 days from the date of change Yes

３ Notification of termination of use of treatment facility

When use of treatment facility is terminated.

Terminated treatment facility Within 30 days from the date of termination Yes

４ Notification of succession

When there is succession to the position of the person that has submitted the notification in 1.



Yes

５ Notification of completion of construction

Upon completion of construction for a new installation, etc., of a treatment facility or for a change of use for which a notification has been submitted.


● Other notifications The Sewerage Ordinances require that a person be appointed to be responsible for management of water quality, and that person be notified. Refer to page 11 for details of the notification.

８９


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





８９

－8－


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





８９


１





No











Yes





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１





No











Yes





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１





No











Yes





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１





No











Yes





８９

－9－

It is a duty to appoint the Water Quality Manager

- What is the Water Quality Manager system? – There are some substances that are difficult to treat at the Water Reclamation Centers. In order to preserve the water quality of public water body and to protect the public sewerage system, it is necessary that there is self-management of wastewater on workplaces. In Tokyo it is obligatory to appoint a water quality manager on workplaces that have a possibility of discharging wastewater that does not comply with the discharge standards, and notify the Metropolitan Government. In some cases there is an exemption for appointment of the water quality manager. For details inquire at the relevant Sewerage Office (see the back cover). Work of the water quality manager 1 Manage facilities generating wastewater, facilities treating wastewater, and treatment facilities. 2 Measure and record the water quality of the wastewater discharged. 3 Take the necessary measures in case of an accident. 4 Be a contact person for guidance from the Bureau. Requirements of a water quality manager 1 Workplaces having a processing facility or treatment facility that treats more than 30 liters of

wastewater in 1 day (1) A person having national water quality and pollution control manager's qualification (2) A person having a Tokyo pollution control manager's qualification (3) A person that has completed training course (甲(kou)) held by the Bureau (4) A person that has completed training course (甲(kou)) specified by the Bureau 2 Workplaces having a processing facility or treatment facility that processes less than 30 liters of

wastewater in 1 day (1) A person having (1) to (4) of 1 (2) A person that has completed training course (乙(otsu)) held by the Bureau (3) A person that has completed training course (乙(otsu)) specified by the Bureau (4) For a workplace conducting a normal dry cleaning business, a person that has completed training

as a dry cleaner based on the Laundries Law 3 Specified workplace other than 1, 2, etc. (1) A person having (1) to (4) of 2 (2) In workplaces that generate specially-controlled industrial waste other than infectious waste (only

workplaces that commission a company to collect and dispose of all liquid waste), a person that is the manager responsible for specially controlled industrial waste for that workplace, or a person who had training to be the manager responsible for specially controlled industrial waste held by the Japan Industrial Waste Information Center.

１０

－10－

Notifications relating to the water quality manager

F . . . Notification by FAX Title of notification When notification is necessary F

Notification of Appointment of Water Quality Manager

When a water quality manager is appointed or changed, please notify the relevant Sewerage Office

Yes

Application for Certificate of Completion of Training for Qualification of Water Quality Manager

For application of certificates of completion by a person that has completed the training course held by the Bureau, please apply to the Drainage and Industrial Wastewater Guidance Section of the Facilities Management and Maintenance Division.

Yes

１１

－11－

Measures to Deal with Water Quality Accidents

- Contact the Bureau of Sewerage in the event of a water quality accident - For all workplaces (including specified workplace, non-specified workplace), in the event of occurrence of an accident (water quality accident*) in which wastewater that includes harmful substances or oil, etc., is discharged into the public sewerage system, emergency measures shall be taken to prevent discharge into the sewerage system, the situation shall be promptly reported to the relevant Sewerage Services Administration Office (see back page).And obey the instructions of the person in charge. * Example of water quality accident Stoppage of function of treatment facility due to fire, power cut, etc., damage to storage tank pipes,

etc., operational error, etc.)

Details to be reported

1 Name of person reporting 2 Outline of the water quality accident: Date and time of occurrence (discovery) of the accident

Name and address of workplace where accident occurred Facility that discharged harmful substances, etc. Substances discharged into sewerage system and estimated quantity

(or quantity discharged from facility) 3 Whether or not police, fire brigade, ward office, etc., have been notified 4 Details of emergency measures taken 5 Current status of discharge to the public sewerage system 6 Contact details of the person reporting (telephone number, etc.)

The Sewerage Law requires measures to be taken on specified workplaces when a water quality

accident occurs

1 When an accident occurs in which wastewater that includes harmful substances or oil* is discharged into the public sewerage system, specified workplace must immediately take emergency measures, and promptly notify the relevant Sewerage Office of the status of the accident and an outline of the measures taken.

However, if the discharge standards are satisfied even though wastewater has been discharged into the sewerage system, there is exemption from taking measures when the accident occurs.

If appropriate emergency measures are not taken, the Director General of the Bureau of Sewerage of Tokyo may order emergency measures to be taken.

2 If the order to take emergency measures is violated, punishment of up to 6 months’ imprisonment or

１２－12－

a fine of up to 500,000 yen may be imposed. (Up to 3 months' imprisonment or a fine up to 200,000 yen in the case of an unintentional act)

* Wastewater containing harmful substances or oil, etc. (substances that must be notified, etc.) The harmful substances shown on the Table “Discharge standards for the 23 wards in Tokyo (excluding dioxins)” (page 5) (the 27 substances from cadmium to 1, 4-dioxane) and ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, vinyl chloride monomer, trans-1, 2-dichloroethylene, dioxins, oils (crude oil, heavy oil, lubricating oil, light oil, kerosene, volatile oils, animal and vegetable oils and fat)

１３－13－

There are Other Matters that Must be Observed

- Measurement and recording of water quality - Operators of specified facilities that discharge wastewater are required to measure the water quality of the wastewater. Records of the measurement results must be retained for 5 years. Please consult with the relevant Sewerage Office (see back cover) regarding the method of measurement, measurement locations, and method of recording. The freguency of measurement times is as follows.

Measurement item Number of measurements pH, temperature More than once per day BOD More than once per 14 days Dioxins More than once per a year Other items More than once per 7 days

In case of failing to record in accordance with the regulations or falsification of records

A fine of up to 200,000 yen may be imposed.

- Obligation to permit inspections -

The staff of the Bureau has authority to enter the land or buildings within the wastewater area, and can conduct any inspections of the wastewater facilities, specified facilities, or treatment facilities, in order to conserve the function and structure of the public sewerage system, or, to ensure compliance with the discharge standards for wastewater discharged to the public sewerage system.

Refusal, impeding, or avoiding inspection A fine of up to 200,000 yen may be imposed.

- Reporting Obligation - Operators of specified facility and everyone that discharge violation wastewater shall report the following matters when the Bureau request. 1 Status of the workplace discharging the wastewater 2 Status of the treatment facility 3 Water quality of the wastewater

In case of failing to report or falsifying a report A fine of up to 200,000 yen may be imposed.

１４－14－

Example of treatment method for acidic or alkaline wastewater (neutralization method)

Methods of Wastewater Treatment (Example)

Alkali

pH

Conditioning tank

P

Equalization tank

Acid

Treated water

Neutralization tank

Wastewater

1 Acid or alkali (hydrogen ion concentration (pH)) Treatment of acidic or alkaline wastewater is carried out by the neutralizing method in which a neutralizing agent with different properties (acid or alkaline) is added to adjust the pH to neutral. Sulfuric acid or sodium hydroxide (caustic soda) can be used as the neutralizing agent. For strong acidic or strong alkaline wastewater, it is difficult to obtain treated water with a stabilized neutral pH with one stage treatment, so it is necessary to carry out the neutralizing process in two stages. Also, if both acidic and alkaline wastewater is generated, it is possible to economize by neutralizing agent by mixing them. However, if wastewater is used as a neutralizing agent for final neutralization, etc., it is necessary to take sufficient care regarding regulated substances such as heavy metals that may be included in the wastewater used as neutralizing agent. 2 Biochemical oxygen demand (BOD) Polluting substances measured as BOD are mainly organic substances. These substances consume the dissolved oxygen. As a result, corruption of the wastewater happens, and it becomes the cause of a bad smell and the poisonous gas. Treatment of BOD wastewater is normally carried out by a method such as the activated sludge process or the contact aeration process. In the activated sludge method, activated sludge is mixed with the wastewater, air is fed into the mixture, and the polluting substances are oxidized and decomposed by the action of aerobic microorganisms in the sludge. On the other hand, in the contact aeration process, an element referred to as a “fixed filter bed” to which a microbial membrane is adhering is immersed in the wastewater, air is fed into the wastewater, and the polluting substances are oxidized and decomposed by the action of aerobic microorganisms adhering to the element. Also, a process using microorganisms such as yeast is used for treating wastewater with high BOD.

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Example of treatment method for nitrogen and phosphorus wastewater

Screen

Treated water Circulation water

Settlement tank

Returned sludge

Reaction tank

Air Excess sludge

Wastewater

Equalization

tank (Sludge treatment)

PP

PAC

3 Nitrogen

The basis of nitrogen treatment is biological processing similar to BOD treatment. Organic nitrogen and ammonium nitrogen in the wastewater is oxidized to nitrate-nitrogen by the action of nitrifying bacteria under aerobic conditions.

It is reduced to nitrogen gas by the action of denitrifying bacteria under anaerobic conditions, and it is removed to the atmosphere. 4 Phosphorous To remove phosphorous, a biological treatment (anaerobic or aerobic process) using the excess phosphorous uptake phenomenon by activated sludge, or a chemical precipitation treatment that removes insoluble phosphorous compounds by adding a coagulant such as polyaluminium chloride (PAC) or similar can be used. To remove both nitrogen and phosphorous simultaneously, some methods such as anaerobic-anoxic-oxic-process and combination of nitrogen treatment and coagulant are general.

5 Suspended solids (SS) Wastewater which needs SS treatment is from almost all food manufacturing or kitchen facilities that are subject to processing for BOD and normal-hexane extracts. Therefore SS treatment is normally not carried out alone, but methods such as the dissolved air flotation method, which is a method of BOD treatment or normal-hexane extracts, the natural flotation method, the filtration method, and the chemical precipitation process are generally used.

Example of treatment method for BOD wastewater (activated sludge process)

Excess sludge

(Sludge treatment) PReturn sludge Equalization tank

Wastewater

Screen

Air Treated water

Reaction tank Settlement tank

P

P

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6 Normal-hexane extracts

Normal-hexane extracts refers to oils in wastewater that are extracted by normal-hexane as the solvent. These oils are normally treated by the biological treatment, the pressurized flotation method, the chemical precipitation process, etc. In the case of kitchen wastewater, biological treatment can be carried out together with BOD and other organic material. In the dissolved air flotation method oils are made to adhere to fine air bubbles, and then separated and removed by flotation. In the chemical precipitation process, the process is the same as for SS treatment, and this process is used in particular with the purpose of mineral oils treatment. 7 Volatile organic compounds (VOC) such as trichloroethylene, etc. In addition to trichloroethylene, “trichloroethylene, etc.” refers to the 9 substances from tetrachloroethylene to 1, 3-dichloropropane among the organic substances listed in page 5, and benzene and 1, 4-dioxane. These substances are used for removal of grease, cleaning metal products, peeling paints, dry cleaning agents, and etc. To treat trichloroethylene, etc., dissolved in water, the adsorption method or the aeration method are used. With the adsorption method, trichloroethylene is adsorbed and removed by directly passing through activated carbon. On the other hand, in the aeration method, air is blown into the wastewater to expel dissolved trichloroethylene, etc., and after it is vaporized in air it is removed by adsorption onto activated carbon. Also, for dichloromethane or 1, 2-dichloroethane, both among trichloroethylene, etc., are comparatively easily dissolved in water, and the concentration in wastewater can be easily increased, so it is necessary to avoid mixing these substances with water as much as possible. As for the other method, the wastewater including these solvents can be collected and treated by industrial

waste disposal operators.

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Example of treatment method for wastewater containing oils (dissolved air flotation method)

Sludge storage tank

Wastewater

coagulant Acid Alkali

P pH

Pressurized water

Flocculation

tank

(Sludge treatment)

Treated water

flotation tank Equalization tank pH adjustment

tank

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Air

8 Iodine consumption Iodine consumption refers to the quantity of iodine consumed by reducing substances in the wastewater. This is the quantity of reducing substances that consume oxygen in the wastewater expressed as the quantity of iodine consumed. The substances that cause an increase in the iodine consumption in the wastewater include reducing substances such as hydrogen sulfide, sodium sulfite, sodium sulfide, sodium thiosulfate, organic matter, etc. Treatment methods include the oxidation method by aeration, etc., or the chemical oxidation method. However for processing wastewater containing hydrogen sulfide, harmful gas is generated by the aeration method, so the chemical oxidation method using sodium hypochlorite or similar is used. 9 Cyanide compound The alkaline-chlorine method or the ion exchange method, etc., are used for processing cyanide containing wastewater. The normal processing method used is the alkaline-chlorine method in which the wastewater is made alkaline, and the cyanide is oxidized and separated using an oxidation agent. The cyanide oxidation and decomposition reaction using the alkaline-chlorine method proceeds in 2 stages, so a cyanide processing facility normally consists of an adjustment tank, a primary and secondary reaction tank, a chemical tank, etc. The oxidizing agent used for oxidative decomposition is normally sodium hypochlorite, which is easily handled. Control of pH adjustment and addition of the oxidizing agent in the reaction tank is carried out using a pH meter and an ORP meter. If the wastewater contains heavy metals such as iron , nickel, they form complexes. In this case, it is difficult to decompose the cyanide, so treatment must be carried out by a special method such as the ferric hexacyanoferrate method or the zinc white method. Therefore, in the operation processes on workplaces, it is necessary to sufficiently separate the wastewater systems so that wastewater containing iron and nickel that form complexes that are difficult to decompose and wastewater containing cyanide are separated. Also, if cyanide wastewater also contains heavy metals, further treatment is necessary to remove the heavy metals. As for the other method, the wastewater including cyanide can be collected and treated by industrial waste disposal operators.

Trichloroethylene, etc. Trichloroethylene, etc.

Activated carbon tank

Exhaust gasF

Example method of processing trichloroethylene, etc. (Adsorption method) (Aeration method)

(Exhaust gas)

Separation tank

Treated water

Activated carbonTreated water

Wastewater Wastewater

Aeration tank Separation tank

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Example method of processing hexavalent chromium wastewater (reduction method)

pH ORP

Example of treatment method for cyanide wastewater (alkaline-chlorine method)

pH ORP pH ORP

Equalization tank

Acid Alkali Oxidizing agent

Treated water

Secondary reaction tank

(Heavy metal treatment)

Alkali Oxidizing agent

Primary reaction tank

Wastewater P

10 Hexavalent chromium The combination of reduction and chemical precipitation method is used for wastewater treatment containing hexavalent chromium. In this method, hexavalent chromium is reduced using a reducing agent, and after converting it to trivalent chromium, a hydroxide that is insoluble in water is generated by the chemical precipitation process, and separation is carried out by precipitation. Normally sodium disulfite or sodium bisulfite is used as the reducing agent. The facilities used for the reduction process normally include an equalization tank (raw water tank), a reduction tank, and a chemical tank. The adjustment of the pH and the addition of reducing agent in the reduction tank are controlled using a pH meter and an ORP meter.

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Oxidizing agent

Reduction tank

(Heavy metal treatment)

Wastewater

Equalization tank

Acid

Treated water P

－19－

11 Heavy metals (cadmium, lead, trivalent chromium, copper, zinc, iron, manganese) Heavy metals are discharged from the workplaces of various types of industry, such as the manufacturing industry, chemical industry, plating industry, and metal product manufacturing industry, etc.. The heavy metals are present in the wastewater as solids not dissolved in the water, or as metallic ions dissolved in the water. Methods of wastewater treatment containing heavy metals include chemical precipitation method, and ion exchange method, but normally chemical deposition method is used in which an alkaline chemical is added to the wastewater, and the heavy metals are deposited and removed as hydroxides. However, in case of existence of complexes with cyanide ,, it is necessary to treat the cyanide in advance as a pre -treatment . Also, the chemical precipitation process with slaked lime is used to treat wastewater containing copper pyrophosphate as a special treatment method. A polyelectrolyte flocculant is also used to promote separation of the generated hydroxide water. Of the heavy metals, in the case of lead, the hydroxide flock after flocculation is very fine, so it is necessary to install a filtration facility such as a total filter press, etc., to separate the solids and the water. * Disposal of industrial waste, etc. Please do not discharge the recovered waste liquid and the sludge remaining after treating the wastewater to the public sewerage system. Dispose it in accordance with the guidance of the Bureau of Environment, Tokyo Metropolitan Government. (Contact details) Regulatory monitoring officer, Industrial Waste Management Section, Sustainable Materials Management Division, Tokyo Metropolitan Government Bureau of Environment: 03-5388-3589 (direct line)

２０

(Neutralization process)

Alkali

Example of treatment method for wastewater containing heavy metals (chemical precipitation process)

P pH Wastewater

Equalization tank

Acid

Treated water

Filtered liquid (to equalization tank)

Sludge

Dewatering machine

Flocculant

Flocculation tank pH controlling

tankSettling tank Sludge

－20－

[Necessity of self-management of treatment facilities] Without proper self-management of treatment facilities, including instruments such as pH meters and quantities of chemicals used, etc., it is not possible to strictly comply with the discharge standards. We ask that all workplaces to carry out appropriate maintenance of treatment facilities. Refer to the Bureau of Sewerage, Tokyo Metropolitan Government for specific details regarding maintenance of treatment facilities (http://www.gesui.metro.tokyo.jp/osigoto/kisei/8izikanri.htm).

- There are financing systems for operators installing treatment facilities, etc.-

Japan Finance Corporation and Tokyo Metropolitan Government provide finance and loans for prevention of pollution. Refer to the following bureaus for details.

Name Contact details Japan Finance Corporation Financing for Small and Medium Enterprise

(SME) Unit, (funding for environmental and energy countermeasures)

Business Financial Consultations, Japan Finance Corporation Telephone: 0120-154-505 (switchboard)

Tokyo Metropolitan Government System Financing for Small and Medium Enterprise Unit,

Financial Affairs Section, Financial Affairs Department, Bureau of Industrial and Labor Affairs , Tokyo Metropolitan Government Telephone: 03-5320-4877

Note that certain wards provide their own financing system. Please inquire at each ward office for details.

- Operators of treatment facilities, etc., can obtain tax reductions- For details, inquire at your nearest Tax Office in the case of national tax, and your nearest Metropolitan Taxation Office in the case of local tax.

Financing and Reduction in Taxation for Installation of Treatment Facilities, etc.

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* Note that in the event of an accident that occurs during nighttime or on a holiday, please use the telephone number within ( ).

Wastewater Facilities Section, Facilities Management and Maintenance Division, Bureau of Sewerage, Tokyo Metropolitan Government 2-8-1 Nishi Shinjuku, Shinjuku-ku,Tokyo 163-8001 Tel. 03-5320-6585 (direct) FAX 03-5388-1706

Office name Address and telephone numberThe number within ( ) is for

emergencies at nighttime or on holidays

Area of jurisdiction

Water Quality Regulation Officer, Customer Service Section, First Eastern Sewerage Services Administration Office

7-1-14 Toyo, Koto-ku, Tokyo 135-0016 Tel. 03-3645-9648 (direct) (03-3645-9641) FAX 03-3649-8355

Sumida, Koto, Minato (Daiba only), and Shinagawa (Higashi Yashio only) Wards

Water Quality Regulation Officer, Customer Service Section, Second Eastern Sewerage Services Administration Office

1-2-1 Kosuge, Katsushika-ku, Tokyo 124-0001 Tel. 03-5680-1392 (direct) (03-5680-1268) FAX 03-5680-1624

Adachi, Katsushika, and Edogawa Wards

Water Quality Regulation Officer, Customer Service Section, First Western Sewerage Services Administration Office

3-37-4 Arai, Nakano-ku, Tokyo 165-0026 Tel. 03-5343-6209 (direct) (03-5343-6200) FAX 03-5343-6216

Chiyoda, Chuo, Minato (excluding Daiba), Shinjuku, Bunkyo, Taito, Shibuya, Nakano, Suginami, Toshima, Kita, Arakawa, Itabashi, Nerima, Wards

Water Quality Regulation Officer, Customer Service Section, Southern Sewerage Services Administration Office

13-26 Yukigayaotsukamachi, Ota-ku, Tokyo 145-0067 Tel. 03-5734-5045 (direct) (03-5734-5031) FAX 03-3728-8280

Shinagawa (excluding Higashi Yashio), Meguro, Ota, Setagaya Wards

Fiscal year 2016

Type 4 size specification

Registration No. 12

For further details of the system of workplace wastewater regulations, notifications regarding specified

facilities, treatment facilities, and water quality managers, etc., please inquire at the following Sewerage

Services Administration Offices.

Documents

Outline of Water Quality Regulations - gesui.metro.tokyo.jp · PDF fileOutline of Water Quality Regulations ... u l s u b s t a n c e s ... Sewerage Law prescribes the facilities which