GRUNDFOS allDOS Data Booklet

Selcoperm electrolytic chlorination system Reliable and easy generation of a hypochlorite solution

for disinfection applications

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SelcopermGeneral

Fundamentals of disinfectionMany diseases are transmitted by drinking water. Among these diseases are typhus, paratyphoid, cholera and diarrhoea with vomiting, as well as viral infections such as hepatitis and poliomyelitis. Legionella in shower or bathing water can provoke pulmonary diseases.

Compared to the chemical contamination of water, where toxicity values are attained only slowly in general, in a drinking water epi-demic infections spread dramatically in the whole supply area. The best prevention of epidemics is to use microbiologically clean non polluted water, preferably deep ground water as drinking water. Unfortunately, in some regions this is not possible for hydrogeological or quantitative reasons. In these regions, surface water is used, which often has to be purified. Pathogens that are possibly encountered, can be removed from the water or killed by adding certain substances to the water, i.e. by disinfecting the water.

Disinfection with chlorineThe most widespread disinfectant used in the treatment of drinking water is chlorine, which can be applied in a variety of ways. History has taught us that, in bacteriological terms, chlorinating water is a quite safe way of disinfecting drinking water. After all, more than 75 years have passed since chlorine was used to disinfect drinking water for the first time. Many years of experience have shown that acute toxicity can be excluded, when chlorination is executed correctly.

The disinfecting properties of chlorine are based on the fact that hypochlorous acid (HClO) is produced when it is dissolved in water, according to the equation Cl

2 + H

20 D HCl + HClo

and depend strongly on the pH value. The best effect is obtained with pH values less than 7.5.

Generally, three methods are used for chlorinating drinking and process water:

1. Chlorine gas dosing

�. Dosing of sodium or calcium hypochlorite solution

3. Electrolytic chlorine generation

The third method in particular offers a number of advantages, which are incorporated in the Selcoperm chlorine electrolysis systems.

Dissociation of hypochlorous acid in dependence of the pH value

3

Selcoperm

the Selcoperm electrolysis principleWith electrolysis, chlorine is produced directly from a solution of common salt using electricity.

General

The following reactions take place in the electrolytic cell:

2 NaCl + 2 H2o g 2 NaoH + Cl

2 + H

2

The chlorine produced reacts immediately with the caustic soda solution also formed, resulting in a hypochlorite solution:

Cl2 + 2 NaoH D NaCl + NaClo + H

2o

The solution generated has a pH value between 8 and 8.5, and a maximum equivalent chlorine concentration in the range of 6 - 8 g/l. It has a half-life of several months, which makes it ideal for storage in a buffer tank.

After dosing the solution into the water flow, no pH value correction is necessary, as it is often required e.g. in electrolysis according to the membrane principle. The sodium hypochlorite solution reacts in a balance reaction, resulting in hypochlorous acid, the efficient disinfectant:

NaClo + H2o D NaoH + HClo

The dosing quantity depends on the application as well as the local regulations. In general, the concentration after the injection unit is 0.3 to � ppm chlorine equivalent.

cathode anode

NaCl +H2O

NaClOsolution

H2

H2ONaCl

NaClO

H+

NaOH

Na+

OH–

Cl2

Cl–

the benefits of the Selcoperm electrolysis method• Common salt is the base material – it is nontoxic and easy to store.

• Only water, common salt and electricity is needed for the electrolysis – low operating costs, world-wide use.

• Fresh hypochlorite is always on hand – the disinfectant solution does not dissociate like commercial hypochlorite solutions. Lower formation of chlorate as a by-product.

• Approved disinfection method complying with the DWI drinking water regulations – an alternative with less safety requirements to chlorine-gas-based systems.

• Robust and elementary components – low-maintenance and a long service life, compared with the membrane cell electrolysis.

• Lower pH of product compared with commercial sodium hypochlorite reduces scaling of injection points etc. in hard water areas.

the applicationsTypical disinfection applications for Selcoperm systems are especially in

• drinking water treatment

• swimming pool water treatment

• industrial treatment for cooling towers or process water.

The systems are an excellent alternative to chlorine-gas or commercial hypochlorite applications.

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SelcopermRequirements

Installation scheme of a Selcoperm system in a room

Requirements for the installation

Water • Good water quality, preferably drinking water

• Supply pressure range: from �.5 to 10 bars. For lower water pressures, booster pumps are available.• Water inflow temperature must be in the range of 5 °C to �0 °C.

Water consumption max. 1�5 litres per kg of prepared chlorine

Salt • Food-grade common salt (DIN 1960�)

• For drinking water disinfection, salt with a low bromide concentration must be used (max. 0.01%)

Salt consumption 3 to 3.5 kg of salt per kg of prepared chlorine

electrical connection 185 to �65 V or 380 to ��0 V; 50/60 Hz

Power consumption approx. �.5 kW per kg of prepared chlorine

Drain An on-site drain for the regeneration water of the water softener is necessary.

exhaust air • The outlet of the exhaust air has to be as close as possible to the electrolytic chlorination system.• In addition, natural air supply via a ventilation hole in the room is required.

1 The internal vent tube has to be piped to the exterior of the building. Minimum tube diameter 90 mm. Maximum length of the tubing 10 m. Must be installed without dips and adequately supported to a safe discharge point.

2 Minimum diameter 3� mm for tubing between the unit and the product tank. Tubing from the Tee above the product tank in an upwards direction until the Venturi Tee.

3 A Venturi Tee is supplied together with the system to assure the adequate dilution of the exhaust air. It should be mounted as close as possible to the vent discharge point.

4 The top edge of the salt solution has to be at least 100 mm above the inlet for the salt solution at the system.5 Around the electrolysing system, enough space should be left free for operation and maintenance work.6 It is recommended that the room has high level natural ventilation.

0

1

min

.10

0 m

m

min. 50 cm min. 50 cm

max.30 cm

3

2

E16

5 5

B4

A D

C

Components of the installation:

a Selcoperm electrolytic chlorination system

B Brine tankC Product tankD Dosing pumpse Vent tubing

5

Selcoperm

Selection diagram

Structure of a Selcoperm systemSelcoperm unit comprises of the electrolyser, degassing column, brine dosing pump, exhaust fan with quantitative air flow monitor for air dilution of electrolyser chamber and a water softening system. Additional equipment which is required is a salt saturator, product tank for storage of the generated solution and dosing pumps. The installation is be rounded off with a measuring and control unit for chlorine dosing, if required.

The Selcoperm system is supplied as a turn-key solution, only the tubing for the water connection, the connections for the salt and prod-uct storage tanks and the exhaust air tubing have to be installed. The size of the storage tank depends on the space available and the amount of NaClO buffer storage required. The sizing of the brine tank also depends on the space available and on the salt filling option: manual or automatic.

Structure / Dimensioning

DimensioningStandard Selcoperm systems are available in five capacity levels. The choice of the system depends on the maximum daily chlorine demand (dosing quantity x daily maximum water flow rate).

Dosing quantity in mg/l

Water flow (log)

Corresponding chlorine quantity

Selcoperm �000

Selcoperm 1000

Selcoperm 500

Selcoperm �50

Selcoperm 1�5

Information on larger or smaller capacities available on request.

6

SelcopermStructure

Structure of a Selcoperm system (description see pages 6 - 8)

electrolyser cell and hydrogen degassing column

• Installed in a separate chamber with a quantitatively monitored air flow• Electrolyser cell (1) in a vertical transparent PVC pipe for easy process monitoring and visual electrode check• Electrodes are made of titanium carrier material with a very durable catalytic metallic oxide coating, also suitable for cold water

applications of 5 °C and higher.• The hydrogen degassing column (2) removes the formed hydrogen via the vent hole and prevents it from penetrating the product

storage tank. The hydrogen is piped through the outlet (F) via a dual contained pipework into the ambient air. In the event of a block-age, an integrated sensor switches off the system.

Hydraulic chamber

• Grundfos Alldos dosing pump (3) with a wide adjustment range for precise dosing of the salt solution

• Flow meter (4) with switch for safe process interruption, if the value falls below its critical minimum

• Water flow valve (5) for the reproducible adjustment of the dilution ratio

• Adjustable pressure reducing valve (6) with pressure reading for the water supply

• Continuously operating water softener system (7) for the reduction of the water hardness to below �0 mg/l (CaCO

3)

• Sample valves for softened water (B), brine solution (C) and product solution (D)

Control system

• Lockable control panel (10) IP 55 with integrated water cool-ing for the high-performance electronics

• Display with presentation of system status, amperage, volt-age, service hours and temperature of the electrolyser cell

• Functions: automatic tank refilling, manual system shutdown or remote Off

• Potentiometer for voltage adjustment (11)• Display of error messages: current too high, current too low,

overtemperature electrolyser cell, leakage, overtemperature electronics, ventilation error, water flow error.

• Potential-free alarm contact

Ventilation

• Air dilution fan with flow rate indication (12)• Forced ventilation in the electrolyser chamber. At the vent

discharge point outside the building dilution of the hydrogen produced.

The turn-key Selcoperm systems are piped, wired labelled and tested before delivery.

6 7

13 F

10

12

13

3

9

4

5

8

7

SelcopermStructure / Measurements

Structure and measurements of a Selcoperm system

View left side View right side

Measurements in mm

legend1 Electrolyser cell� Hydrogen degassing column3 Dosing pump� Water flow meter5 Water flow valve6 Pressure reducing valve7 Water softener8 Level sensor9 Non-return valve10 Control panel11 Potentiometer for voltage control1� Air dilution fan13 Exhaust system with air flow meter1� Drain plug

D Outlet: product to storage tankF Vent discharge outlet

1800

950 (125 - 500)

1050 (1000 - 2000)18

00

950 (125 - 500)

1050 (1000 - 2000)

13 13

10 10

12 12

1

2

3

4

5

9

8

F F

D

13 13

6 7

8

Selcoperm

Connections

Connection Internal diameter

metric imperial

Water Inlet (A) �0 mm 1/�”

Softened water outlet (B) �0 mm 1/�”

Brine solution inlet (C) �0 mm 1/�”

Product outlet (D) 3� mm 1”

Rinsing water outlet (E) 3� mm 1”

Vent discharge outlet (F) 90 mm 3”

Measurements

Measurements in mm

1800

700

Measurements of a Selcoperm system

700

1800

Front viewBack view

D

e

13

C

B

a

legend10 Control panel11 Voltage controller1� Air dilution fan13 Exhaust system1� Drain plug

A Water Inlet

B Softened water outlet

C Brine solution inlet

D Product outlet

E Rinsing water outlet

F Vent discharge outlet

13

10

12

14 14

11

FF

9

SelcopermIdentification

type key SeS electrolytic chlorination systemexample: type key SeS-250-M/1 = capacity 250 g/h, metric connections, supply voltage 220-260 V / 50 Hz

example: SeS -250 -M /1

type range

Max. capacity

1�5 1�5 g/h �50 �50 g/h 500 500 g/h1000 1000 g/h�000 �000 g/h

Connection

I imperialM metric

Supply voltage

H 95-1�0 V / 50-60 Hz1 ��0-�60 V / 50 Hz6 ��0-�60 V / 60 Hz� 380-��0 V / 50 Hz; 3+N*5 380-��0 V / 60 Hz; 3+N*

N* = neutral

10

Selcopermtechnical Data

technical data / order data

Selcoperm Capacity Voltage Phases Frequency Connections order Number

type [g Cl2/h] [kg Cl

2/day] [V] [Hz]

SeS-125-I/1

1�5 3

��0-�60 1 50 imperial95702180

(195-125-10003)

SeS-125-I/6 ��0-�60 1 60 imperial95702181

(195-125-10004)

SeS-125-I/H 95-1�0 1 50-60 imperial95702182

(195-125-10005)

SeS-125-M/1 ��0-�60 1 50 metric95702167

(195-125-10000)

SeS-125-M/6 ��0-�60 1 60 metric95702178

(195-125-10001)

SeS-125-M/H 95-1�0 1 50-60 metric95702179

(195-125-10002)

SeS-250-I/1

�50 6

��0-�60 1 50 imperial95702192

(195-250-10003)

SeS-250-I/6 ��0-�60 1 60 imperial95702193

(195-250-10004)

SeS-250-I/H 95-1�0 1 50-60 imperial95702194

(195-250-10005)

SeS-250-M/1 ��0-�60 1 50 metric95702189

(195-250-10000)

SeS-250-M/6 ��0-�60 1 60 metric95702190

(195-250-10001)

SeS-250-M/H 95-1�0 1 50-60 metric95702191

(195-250-10002)

SeS-500-I/1

500 1�

��0-�60 1 50 imperial95702200

(195-500-10004)

SeS-500-I/6 ��0-�60 1 60 imperial95702201

(195-500-10005)

SeS-500-I/4 380-��0 3 + N* 50 imperial95702202

(195-500-10006)

SeS-500-I/5 380-��0 3 + N* 60 imperial95702203

(195-500-10007)

SeS-500-M/1 ��0-�60 1 50 metric95702196

195-500-10000

SeS-500-M/6 ��0-�60 1 60 metric95702197

(195-500-10001)

SeS-500-M/4 380-��0 3 + N* 50 metric95702198

(195-500-10002)

SeS-500-M/5 380-��0 3 + N* 60 metric95702199

(195-500-10003)N* = neutral

11

Selcopermtechnical Data

technical data / order data (continuation)

Selcoperm Capacity Voltage Phases Frequency Connections order Number

type [g Cl2/h] [kg Cl

2/day] [V] [Hz]

SeS-1000-I/1

1000 ��

��0-�60 1 50 imperial95702171

(195-1000-10004)

SeS-1000-I/6 ��0-�60 1 60 imperial95702172

(195-1000-10005)

SeS-1000-I/4 380-��0 3 + N* 50 imperial95702173

(195-1000-10006)

SeS-1000-I/5 380-��0 3 + N* 60 imperial95702174

(195-1000-10007)

SeS-1000-M/1 ��0-�60 1 50 metric95702205

(195-1000-10000)

SeS-1000-M/6 ��0-�60 1 60 metric95702168

(195-1000-10001)

SeS-1000-M/4 380-��0 3 + N* 50 metric95702169

(195-1000-10002)

SeS-1000-M/5 380-��0 3 + N* 60 metric95702170

(195-1000-10003)

SeS-2000-I/4

�000 �8

380-��0 3 + N* 50 imperial95702185

(195-2000-10002)

SeS-2000-I/5 380-��0 3 + N* 60 imperial95702186

(195-2000-10003)

SeS-2000-M/4 380-��0 3 + N* 50 metric95702183

(195-2000-10000)

SeS-2000-M/5 380-��0 3 + N* 60 metric95702184

(195-2000-10001)

N* = neutral

1�

Selcopermaccessories

accessories

Salt tanks• for the production of a saturated salt solution. Material: Polyethylene• with water inlet valve and gravel bed

type Capacity Diameter Height order Number

[kg] [mm] [mm]

Set-120-S 100 500 77095702177

(195-100S-1)

Set-330-S �00 650 1��095702188

(195-200S-1)

Set-1180-S 800 1050 150095702234

(195-800S-1)

Other tank sizes on request.

Product storage tanks• with integrated bund, leakage and level sensor, ready for connection with Selcoperm. Material: Polypropylene

type Capacity Width Depth Height order Number

[l] [mm] [mm] [mm]

Set-200-P �00 1100 780 60095702187

(195-200P-1)

Set-300-P 300 1100 780 60095702195

(195-300P-1)

Set-500-P 500 1300 900 60095702235

(195-500P-1)

Set-600-P 600 (� x 300) 1800 780 60095702236

(195-600P2-1)

Set-990-P 1000 1500 1150 65095702175

(195-1000P-1)

Set-1000-P 1000 (� x 500) �1�0 900 60095702176

(195-1000P2-1)

Other tank sizes on request.

Product tank with bundBrine tank

Outlet brine solutionØ �0 mm

Inlet softened waterØ �0 mm

Supply connection Ø 3� mmDrain connection � x Ø �5 mm

13

Selcoperm

test kit• for testing the generated product by titration method

Description order No.

Test Kit PWS T1000, comprising:5 pipettes, 1 measuring cylinder, 1 hardness test kit, 1 thermometer, 1 hydrometer, 1 encapsulated instruction sheet, 1 PP carry case

95702376

(553-1750)

acid rinsing set• for cleaning the electrolyser cell in case of deposits

Description order No.

Acid rinsing set95702377

(553-1751)

Maintenance kit

Description order No.

Maintenance kit gaskets for Selcoperm 1�5 bis 50095702281

(553-240)

Maintenance kit gaskets for Selcoperm 1000 bis �00095702282

(553-241)

accessories

1�

Selcopermapplication scheme

Drinking water treatment with Selcoperm

legend1 Groundwater� Chemical tanks3 Measuring system� Selcoperm electrolytic chlorination system5 Oxidation6 Filtration7 Chemical conditioning

1

2

3

4

56

7

2 4

3

15

Selcoperm

Swimming pool water treatment with Selcoperm

CAN3 - 12 x DIP-A.

PAC NaClO pH

legend1 Swimming pool� Remote maintenance, logging per PC3 DIP compact measuring and control system� DIT analysing system5 Selcoperm electrolytic chlorination system6 Dosing station for flocculent (PAC)7 Dosing station for hypochlorite8 Dosing station for pH-correction9 Injection units10 Surge basin11 Filter1� Circulating pump13 Sample water feeding line1� Sample water recycling line

1

10

2

5

4

3

6 7 8

9

9

9

11

12

13

14

application scheme

Being responsible is our foundationThinking ahead makes it possible

Innovation is the essence

Subject to change.95701824 0608eN

15.810048 V2.0

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