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GRUNDFOS allDOS Data Booklet
Selcoperm electrolytic chlorination system Reliable and easy generation of hypochlorite solution
for disinfection applications
2
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
2. 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
0
20
40
60
80
100
100
80
60
40
20
0
4 5 6 7
% HClO % Cl2
pH
HClO
Cl2 ClO-
1 2 3 8 9
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 8.5 and 9.5, 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 2 ppm chlorine equivalent.
cathode anode
NaCl +H2O
NaClO solution
H2
H2ONaCl
NaClO
H+
NaOH
Na+
OH–
Cl2
Cl–
the benefits of the electrolysis with Selcoperm• Robustturn-key system
• Safe and reliable method of producing chlorine on-site
• Commonsaltisthebasematerial–itisnontoxic,easytostoreandtohandle.
• Onlywater,commonsaltandelectricityisneededfortheelectrolysis–lowoperatingcosts,world-wideuse
• Freshhypochloriteisalwaysonhand–thedisinfectantsolutiondoesnotdissociatelikecommercialhypochloritesolutions
• Lowerformationofchlorateasaby-product
• ApproveddisinfectionmethodcomplyingwiththeDWIdrinkingwaterregulations–analternativewithlesssafetyrequirementstochlorine-gas-based systems
• Robustandelementarycomponents–low-maintenanceandalongservicelife,comparedwiththemembranecellelectrolysis
• 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
• drinkingwatertreatment
• swimmingpoolwatertreatment
• industrial treatment for cooling towers or process water.
The systems are an excellent alternative to chlorine-gas or commercial hypochlorite applications.
4
SelcopermRequirements
Installation scheme of a Selcoperm system in a room
Requirements for the installation
Water • Goodwaterqualitywithlowiron(<200mg/m3)andmanganese(<50mg/m3) content, preferably drinking water
• Supplypressurerange:from2.5to10bars.Forlowerwaterpressures,boosterpumpsareavailable.• Waterinflowtemperaturemustbeintherangeof5°Cto20°C.
Water demand 125-150 litres per kg of prepared chlorine
Salt • Food-gradecommonsalt(DIN19604orEN973)
• Fordrinkingwaterdisinfection,saltwithalowbromideconcentrationmustbeused(max.0.01%)
Salt consumption 3 to 3.5 kg of salt per kg of prepared chlorine
electrical connection 185 to 265 V or 380 to 440 V; 50/60 Hz
Power consumption approx. 4.5-5.5 kWh per kg of prepared chlorine
Drain An on-site drain for the regeneration water of the water softener is necessary.
exhaust air • Theoutletoftheexhaustairhastobeascloseaspossibletotheelectrolyticchlorinationsystem.• Inaddition,naturalairsupplyviaaventilationholeintheroomisrequired.
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 32 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 brine has to be at least 100 mm above the brine outlet. 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 and low level natural ventilation.
Components of the installation:
a Selcoperm electrolytic chlorination system
B Brine tankC Product tankD Dosing pumpse Vent tubing
A
B
C
D
E3
6
1
4
2
65 5
750 750
5
Selcoperm
Structure of a Selcoperm systemSelcoperm units comprise 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 can 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 amountofNaClObufferstoragerequired.Thesizingofthebrinetankalsodependsonthespaceavailableandonthesaltfillingoption:manual or automatic.
Unique selling Points• Quantitativeairflow-airisblowncontinuouslythroughtheelectrolyserchamber,andismonitoredbyaquantitativeairflowsensor
to ensure that the correct volume of air is flowing through the system at all times.
• Theelectrodesaswellasthehydrogendegassingcolumnaredualcontained,inordertoavoidhydrogenleakingfromthesystemintothe plant room.
• Noexternalriskzone–fullycompliantwithATEX.
• Negativepressureonproductstoragetank–aventuriteeisfittedinthehydrogenventilationpipework;thisservesasasiphonbreakand tank ventilation to ensure that all hydrogen in the product tank is safely removed to atmosphere.
• Productsolutionwith6-8g/lchlorineconcentrationcanbestoredforseveralweekswithoutanydegradation.
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).
Selection diagram
Dosing quantity in mg/l
Water flow (log)
Corresponding chlorine quantity
Selcoperm 2000
Selcoperm 1000
Selcoperm 500
Selcoperm 250
Selcoperm 125
larger capacities available on request
smaller capacities available on request
6
SelcopermStructure
Structure of a Selcoperm system (description see pages 6 - 8)
electrolyser cell and hydrogen degassing column
• Installedinaseparatechamberwithaquantitativelymonitoredairflow• Electrolysercell(1) in a vertical transparent PVC pipe for easy process monitoring and visual electrode check• Electrodesaremadeoftitaniumcarriermaterialwithaverydurablecatalyticmetallicoxidecoating,alsosuitableforcoldwater
applicationsof5°Candhigher.• Thehydrogendegassingcolumn(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
• GrundfosAlldosdosingpump(3) with a wide adjustment range for precise dosing of the salt solution
• Flowmeter(4) with switch for safe process interruption, if the value falls below its critical minimum
• Waterflowvalve(5) for the reproducible adjustment of the dilution ratio
• Adjustablepressurereducingvalve(6) with pressure reading for the water supply
• Continuouslyoperatingwatersoftenersystem(7) for the reduction of the water hardness to below 20 mg/l (CaCO
3)
• Samplevalvesforsoftenedwater(B), brine solution (C) and product solution (D)
Control system
• Lockablecontrolpanel(10) IP 55 with integrated water cool-ing for the high-performance electronics
• Displaywithpresentationofsystemstatus,amperage,volt-age, service hours and air flow rate
• Functions:automatictankrefilling,manualsystemshutdownor remote Off
• Displayoferrormessages:low voltage, high voltage, overtemperature electrolyser cell, leakage, overtemperature electronics, ventilation error, water flow error.
• Potential-freealarmcontact
Ventilation
• Airdilutionfan(11) with air flow sensor (12)• Forcedventilationintheelectrolyserchamber.Atthevent
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
12 F
10
11
12
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 cell2 Hydrogen degassing column3 Dosing pump4 Water flow meter5 Water flow valve6 Pressure reducing valve7 Water softener8 Level sensor9 Non-returnvalve10 Control panel11 Air dilution fan12 Exhaust system with air flow sensor 13 Drain plug
D Outlet: product to storage tankF Ventdischargeoutlet
10
90
80
70
60
50
40
30
20
100
I/h
1000 (125-500)
1100 (1000 - 2000)
1800
1000 (125-500)
1100 (1000 - 2000)
1800
11.
12.
10.
11.
12.
10.
1.
2.
8.
5.
4.
9.
3.
6.7.
12.12.
8
Selcoperm
Connections
Connection Internal diameter
metric imperial
Water Inlet (A) 20 mm 1/2”
Softened water outlet (B) 20 mm 1/2”
Brine solution inlet (C) 20 mm 1/2”
Product outlet (D) 32 mm 1”
Rinsingwateroutlet(E) 32 mm 1”
Ventdischargeoutlet(F) 90 mm 3”
Measurements
Measurements in mm
Measurements of a Selcoperm system
FrontviewBack view
legend10 Control panel11 Air dilution fan12 Exhaust system13 Drain plug
A Water Inlet
B Softened water outlet
C Brine solution inlet
D Product outlet
E Rinsingwateroutlet
F Vent discharge outlet
12
A
B
C
E
1330
1430
1530
1660
125
D
F
700
12
1313
11
10
700
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
125 125 g/h 250 250 g/h 500 500 g/h1000 1000 g/h2000 2000 g/h
Connection
I imperialM metric
Supply voltage
H 95-120 V / 50-60 Hz1 220-260 V / 50 Hz6 240-260 V / 60 Hz4 380-440V/50Hz;3+N*5 380-440V/60Hz;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
125 3
220-260 1 50 imperial95702180
(195-125-10003)
SeS-125-I/6 240-260 1 60 imperial95702181
(195-125-10004)
SeS-125-I/H 95-120 1 50-60 imperial95702182
(195-125-10005)
SeS-125-M/1 220-260 1 50 metric95702167
(195-125-10000)
SeS-125-M/6 240-260 1 60 metric95702178
(195-125-10001)
SeS-125-M/H 95-120 1 50-60 metric95702179
(195-125-10002)
SeS-250-I/1
250 6
220-260 1 50 imperial95702192
(195-250-10003)
SeS-250-I/6 240-260 1 60 imperial95702193
(195-250-10004)
SeS-250-I/H 95-120 1 50-60 imperial95702194
(195-250-10005)
SeS-250-M/1 220-260 1 50 metric95702189
(195-250-10000)
SeS-250-M/6 240-260 1 60 metric95702190
(195-250-10001)
SeS-250-M/H 95-120 1 50-60 metric95702191
(195-250-10002)
SeS-500-I/1
500 12
220-260 1 50 imperial95702200
(195-500-10004)
SeS-500-I/6 240-260 1 60 imperial95702201
(195-500-10005)
SeS-500-I/4 380-440 3+N* 50 imperial95702202
(195-500-10006)
SeS-500-I/5 380-440 3+N* 60 imperial95702203
(195-500-10007)
SeS-500-M/1 220-260 1 50 metric95702196
195-500-10000
SeS-500-M/6 240-260 1 60 metric95702197
(195-500-10001)
SeS-500-M/4 380-440 3+N* 50 metric95702198
(195-500-10002)
SeS-500-M/5 380-440 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 24
220-260 1 50 imperial95702171
(195-1000-10004)
SeS-1000-I/6 240-260 1 60 imperial95702172
(195-1000-10005)
SeS-1000-I/4 380-440 3+N* 50 imperial95702173
(195-1000-10006)
SeS-1000-I/5 380-440 3+N* 60 imperial95702174
(195-1000-10007)
SeS-1000-M/1 220-260 1 50 metric95702205
(195-1000-10000)
SeS-1000-M/6 240-260 1 60 metric95702168
(195-1000-10001)
SeS-1000-M/4 380-440 3+N* 50 metric95702169
(195-1000-10002)
SeS-1000-M/5 380-440 3+N* 60 metric95702170
(195-1000-10003)
SeS-2000-I/4
2000 48
380-440 3+N* 50 imperial95702185
(195-2000-10002)
SeS-2000-I/5 380-440 3+N* 60 imperial95702186
(195-2000-10003)
SeS-2000-M/4 380-440 3+N* 50 metric95702183
(195-2000-10000)
SeS-2000-M/5 380-440 3+N* 60 metric95702184
(195-2000-10001)
N*=neutral
12
Selcopermaccessories
Brine tanks• fortheproductionofasaturatedsaltsolution.Material:Polyethylene• withwaterinletvalveandgravelbed
type Capacity [kg]
Ø [mm]
Height [mm]
Inlet connection [mm]
outlet connection [mm]
Weight approx. [kg]
order Number
Set-150-S 150 550 644 20 20 3895714317
(195-150S-1)
Set-300-S 300 640 930 20 20 9695714318
(195-300S-1)
Set-500-S 500 790 1035 20 20 15695714319
(195-500S-1)
Set-1250-S 1250 1148 1040 20 20 22095714320
(195-1250S-1)
Product storage tanks• tanksaremadeofPolyethylene,havealevelsensor,andarereadyforconnectionwithSelcoperm• tanksforupto1000litreshaveanintegratedPolypropylenebundwithleakagesensor
type Capacity [l]
Diamater [mm]
Width [mm]
length [mm]
Height [mm]
Inlet connec-tion [mm]
outlet con-nection [mm]
Weight approx. [kg]
order Number
Set-350-P 350 660 800 1160 1200* 32 25 7695714321
(195-350P-1)
Set-501-P 500 800 950 1300 1250** 32 25 9795714322
(195-500P-2)
Set-700-P700
(2 x 350)660 800 1850 1250** 32 25 135
95714323 (195-700P2-1)
Set-991-P 1000 1000 1150 1500 1500** 32 25 14195714324
(195-1000P-2)
Set-1001-P1000
(2 x 500)800 950 2130 1300*** 32 25 162
95714325 (195-1000P2-2)
Set-2000-P 2000 1350 – – 1800 32 32 8195714326
(195-2000P-1)
Set-3000-P 3000 1535 – – 2000 32 32 10795714327
(195-3000P-1)
Set-5000-P 5000 1950 – – 2400 50 50 17095714328
(195-5000P-1)
Set-10000-P 10000 2000 – – 3800 50 50 40895714329
(195-10000P-1)
brine outlet
Product tank with bundBrine tank
softened water inlet
Product tank
inlet connection
outlet connection
*bundheight:450mm **bundheight:500mm ***bundheight:630mm
13
Selcoperm
test kit• fortestingthegeneratedproductbytitrationmethod
Description order No.
Test Kit PWS T1000, comprising:5 pipettes, 1 measuring cylinder, 1 hardness test kit, 1 thermometer, 1 hydrometer, 1 chlorine concentration test kit for product solution, 1 encapsulated instruction sheet, 1 PP carry case
95702376
(553-1750)
acid rinsing set• forcleaningtheelectrolysercellincaseofdeposits
Description order No.
Acid rinsing set comprising a manual acid rinsing pump with hose95702377
(553-1751)
Maintenance kit• includedpartsformaintenanceaftertwoyears(maintenancekitforbrinepump,
set of sealings for Selcoperm)
Description order No.
Maintenance kit gaskets for Selcoperm 125 to 50095702281
(553-240)
Maintenance kit gaskets for Selcoperm 1000 to 200095702282
(553-241)
accessories
Acid rinsing pump
Test kit
14
Selcopermapplication scheme
Drinking water treatment with Selcoperm
legend1 Groundwater2 Measuring system3 Selcoperm electrolytic chlorination system4 Chemical tank5 Oxidation6 Filtration7 Chemical conditioning
12
34
56
7
2
15
Selcoperm
Swimming pool water treatment with Selcoperm
CAN3 - 12 x DIP-A.
PAC NaClO pH
legend1 Swimming pool2 Remotemaintenance,loggingperPC3 DIP compact measuring and control system4 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 Filter12 Circulating pump13 Sample water feeding line14 Sample water recycling line
1
10
2
5
4
3
6 7 8
9
9
9
11
12
13
14
application scheme