Wastewater Management: Overview and Case Studies

Wastewater Management

Peter Metzen, HPCEize Drenth, Antea Group

Confidential – © Inogen Environmental Alliance 2016

Content:

• Introduction

• Standard types of discharge

• Scope of consulting for industrial clients

• Recycling of discharge type 1 – Example Food industry

• Recycling of discharge type 2 – Example Textile industry

• Recycling of discharge type 3 – Example Industrial park

• Conclusion


Introduction

• Closed loop for water is a common wish for most industrialwastewater producers

• What means „closed loop“?- Installation of maximum possible rate for reuse or

recycling of treated wastewater- Reduction of water footprint- Reduction of environmental impact- Zero emission of wastewater is under normal

commercial conditions not possible


Industrial clients

Scope of consulting/engineering in industrial wastewater projects

• Preparation of a wastewater cadastre

• Evaluation of actual costs for wastewaterdisposal

• Definition of quality requirements for reuse of water in production

• Evaluation of actual or expected legislation

• Identification of future cost and possible savings

• New developments and new process technologies

• Concept for watermanagement in production

• Technical/commercial report as base for a decision

After Decision of client:

• Detail Design and all engineering services needed for the treatmentplant andwaterrecycling

• Start of plant operation and training of staff

• Engineering and Installation


Industrial clients

Scope of works for wastewater cadastre

• Integrated Status analysis (Fresh water, wastewater, wastes)

• Preparation of a wastewater cadastre• Wastewater flows and wastewater sources and waterquality (analytic)

• Are different wastewater types collected together or separately?

• What Quality requirements for reuse of water are relevant?

Example:


Standard types of discharge

Industrial plant

Municipal

Wastewater Treatment Plant

River

direct dischargerwastewater

Industrial

wastewater

treatment plant


Standard types of discharge

dire

ct

dis

charg

er

indire

ct

dis

charg

er

CN = 5 m-1

CN = 25 m-1

CN = 85 m-1

raw

waste

wate

r

example:

different effluent qualities

after treatment


Recycling of discharge type 1

Industrial plantwastewater

Recycling XX %

Industrial

wastewater

treatment plant

Municipal

Wastewater Treatment Plant

River

indire

ct


Situation

The malthouse formerly had the status of a direct discharger and was forced bythe local authority to become a indirect discharger.

Consequences for malthouse

• Price for the wastewater discharge into sewer system: 2,88 €/m³

• Yearly fee for wastewater discharge: appr. 1.500.000,- € per year

Example: Food Industry

Without recycling

fresh water demand: 70 m³/hwastewater: 56 m³/h

With recycling 80%

fresh water demand: 26 m³/hwastewater: 12 m³/h



Solution designed

Reduce the wastewater quantity from 100% to 20% by designing a complex waterrecycling.

• 80 % of the water is recycled to drinking water quality (appr. 420.000 m³/a) andused in production

• 20 % of the water is discharged (appr. 105.000 m³/a)

• Invest of recycling plant: 1.250.000,- €

• Spec. price of recycling: appr. 1,20 €/m³ versus 2,88 €/m³ for disposal

Benefits for malthouse

• Saving on wastewater fee: appr. 705.000,- € per year

• Saving on rainwater fee: appr. 280.000 € per year



Recycling of discharge type 2

Industrial plant

Municipal

WWTP

Industrial

wastewater

treatment plant

Treatment

effluent

Example: Textile Industry

recycling water stream

anaerobic

treatment

biomass

aerobic

treatmentbiomass-

separation

wastewater stream

anaerobic

treatment

aerobic

treatmentbiomass-

separation

biomass

well water

conditioning

municipal

wastewater

treatment plantproduction

pre-treatment

dyeing

printing

tightening

washing

aerobic treatment

with

membrane filtration

filtrate

biomass

process water

storage

tank

oxidative treatment

for decolorisation

ozone

flow chart

Specification and

Requirements:

Crude water

DOC: 209 - 367 [mg/l]

colour number CN

49 - 115 [1/m]

Pre-treatment of

wastewater for further

treatment in urban

waste treatment plant

(wastewater stream)

Treatment of wastewater

for reuse in textile factory

(recycling water stream)

Example: Textile Industry


Recycling of discharge type 3Industrial Park

Industrial plant

River

wastewater

recycling XX %

Industrial

wastewater

treatment plant

Treatment


Example: Industrial Park

Turn-Key- wastewater treatment- complexe cyanide- infl. 190 mg/l effl. 0,9 mg/l- CE-declaration- NRB-directives- BRL-directives- construction/engineering- Mechanical en Electrical- delivery: December 2016

Manufacturer- herbicide (dichlobenil)- synth. oil voor windturbines- worldwide approx. 900 MEuro

Roadmap- 2 year research with client- tech-partner

Van Remmen UV Techniek B.V.



EU-wastewater derectives:- prohibited to discharge waste water to the surface water- change in content waste water

Question:• Ammonium 50 mg/l• Cyanide totaal 160 mg/l• Indamp rest 41 g/l• Chloride 3200 mg/l• Carbonaat 13.700 mg/l• Bicarbonaat 17.000 mg/l• Natrium 13.000 mg/l• pH 11




Standard solution in the past for industrial plants

Discharge of the wastewater without recycling

Reasons for water recycling

• reduction of costs

• in some regions: unsufficient water supply

• reduction of water footprint

• environmental foot print

• new developments

Technical view

• the higher the recycling quote the bigger the costs

• recycling quote up to 60 – 80 % save costs

• 100% closed loop is almost not possible

• residuals (salts, screenings, concentrates etc) have to be disposed

Conclusion
