Dm (manual) (1).pdf

Operation Manual for DM System description The system is a skid mounted DM unit having facilities for two stage cation and anion unit. The system is engineered for water having dissolved solid level within 500 mg/liter. The capacity of the system is 50-100litre/hr The system removes dissolved salts from water which operates on the principle of ion exchange. The dissolved ions both cation and anion of soluble salts are replaced by hydrogen and hydroxyl ions respectively in cation exchanger and anion exchanger which ultimately converts both ions into a pure water molecule. The exhausted cation exchanger and anion exchanger beds are regenerated by hydrochloric acid and caustic soda solutions respectively. The water which will come out ultimately from the last bed shall be salt free. Standard Features of the system Technology

Exchange based dissolved salt separation.

Model

CA(2)15

Capacity

50-100 liter per hr

System

Skid mounted gravity feed cation & anion exchange unit (two stage)

Component

Cation exchanger (2) & Anion exchanger (2), Chemical solution tank (2), Operating Valves

Valve schedule

Inlet valve (Cation & Anion unit each) Outlet valve Cation & Anion unit each) Down Rinse valve (Cation & Anion unit each), Injection valve (Chemical solution tank each)

Feed Water Quality TSS

< 5NTU

Iron

< 0.3 ppm

TDS

< 500 ppm

Treated water Quality TDS

< 5 -10ppm

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ENVIROSPEC

77A/72, Raja S. C. Mullick Road, P.O.: Regent Estate, Kolkata – 700 092

Telephone: (033) 2412-1573 Email: [email protected]

Operational Procedure Pre start checking up 1. Ensure all the units, valves are in operating condition. 2. Ensure the uninterrupted water supply from the over head tank.

Start up Operation 1. First open the main supply inlet valve to the plant and ensure uninterrupted water supply to the system from water source or reservoir (overhead tank). 2. Next open the inlet & outlet valve of cation unit (1st) and discharge initial water in up-rinse mode for a few minutes. 3. Then transfer the line of cation unit (1st) to inlet of the anion unit (1st). 4. Open the inlet & outlet valve of anion unit (1st) and discharge initial water in up-rinse mode. 5. Adjust the flow rate by controlling inlet valve of cation unit (1st). 6. Check water quality at outlet of anion unit (1st). 7. When quality reaches as per set standard, transfer water line to inlet of cation unit (2nd). 8. Open inlet & outlet valve of cation unit (2nd) and discharge initial water in uprinse mode for few minutes. 9. Next transfer the water line from cation unit (2nd) to inlet of anion unit (2nd). 10. Open the inlet & outlet valve of anion unit (2nd) and discharge initial water in up-rinse mode for few minutes. 11. Check outlet quality. When the quality reaches as per set limit, transfer the water to the process or final collection tank.

Stop Operation 1.

Check water quality in regular interval at the outlet of anion unit (1st) & anion unit (2nd) of both streams.

2.

When quality start deteriorating, stop operation. Close all inlet & outlet valves of the units.

3.

Start chemical regeneration of cation & anion unit for respective stream.

______________________________________________________________________________________

ENVIROSPEC

77A/72, Raja S. C. Mullick Road, P.O.: Regent Estate, Kolkata – 700 092

Telephone: (033) 2412-1573 Email: [email protected]

Chemical Regeneration Procedure Cation Exchange Regeneration 1.

Preparing acid solution Take 2.5 Kg HCl (30%) in acid solution tank and add 7.5 litre DM or Cation free water for dilute the concentration to 6-7.5%.

2.

Start acid Injection Open first soln. tank injection valve & then slowly open the down rinse valve Adjust the down rinse valve for ensuring injection at the rate of 30-40litre/hr so that the entire acid solution can be injected within 15–20 min. When acid injection is completed, close first down rinse valve and then tank injection valve.

3.

Down Rinse Fill solution tank fully with DM or cation free water & open tank injection valve. Open the down rinse valve and rinse the bed with at least 1-1.5 tank volume of water to remove adhered acid from resin surface. Close first down rinse valve and then the tank injection valve.

4.

Up Rinse Open first supply water inlet valve Open then outlet valve of cation unit and start rinse in up-flow mode by discharging the water. Rinse in up-flow mode for 10-20 minutes at service flow rate by adjusting cation inlet valve.

Check the water quality at the outlet. If the water quality found satisfactory, the unit can be taken into service by closing the up rinse valve and transferring the line to inlet of anion unit.

______________________________________________________________________________________

ENVIROSPEC

77A/72, Raja S. C. Mullick Road, P.O.: Regent Estate, Kolkata – 700 092

Telephone: (033) 2412-1573 Email: [email protected]

Anion Exchange Regeneration

1. Preparing alkali solution Take 600 gm NaOH (100%) flake in a separate bucket and add 10 litre DM water for dissolve the salt to make a solution of concentration 6-7.5%. When solution cool down transfer it to solution tank.

2. Start alkali Injection Open first soln. tank injection valve & then slowly open the down rinse valve Adjust the down rinse valve for ensuring injection at the rate of 20litre/hr so that the entire caustic solution can be injected within 30–35 min. When alkali injection is completed, close first down rinse valve and then tank injection valve.

3. Down Rinse Fill solution tank fully with DM water and open the tank injection valve. Open down rinse valve and rinse the bed with at least 2-3 tank volume of water to remove adhered caustic from resin surface. Close first down rinse valve and then the tank injection valve.

4. Up Rinse Open first the cation outlet valve Open inlet valve and outlet valve of anion unit and start rinse in up-flow mode by discharging water through outlet. Rinse for 25-30 minutes at service flow rate by adjusting anion inlet valve.

Check time to time water quality at the outlet of anion unit. If the water quality found satisfactory, the unit can be taken into service by closing the outlet valve and transferring the line to the next unit

______________________________________________________________________________________

ENVIROSPEC

77A/72, Raja S. C. Mullick Road, P.O.: Regent Estate, Kolkata – 700 092

Telephone: (033) 2412-1573 Email: [email protected]