OPERATING PROCEDURE FOR D.M WATER PLANT (MB 25 Mixed Bed)

1. Open ‘B’ and ‘D’ and allow the raw water to pass through bed for 10 minutes.
2. Close ‘B’ and ‘D’. Allow the bed to settle for 10 minutes.
3. Preparation of Soda Solution
Take 12 litres of D.M. water into the caustic tank, weigh and add 0.75 kgs of caustic soda into the tank under stirring. Ensure completely dissolved.
4. Soda Injection
Fill regeneration tank used for regenerating purpose with 5 litres of soda solution. Connect the regenerant inlet and compressed air pipeline to the regenerant tank. Open E and G to allow the soda injection to take for 10 minutes by adjusting the air pressure. Close E and G. After soda injection close E and G and stop compressed air supply.
5. Soda Rinse
Open E and G. Connnect regenerant inlet to raw water. Rinse for 20 minutes. Close E and G.
6. Preparation of Acid Solution
Take 5.5 litres of D.M. water into the acid measuring tank, pour 1.8 litres of acid and stir to get uniformity.
7. Acid Injection
Fill the regenerant tank with 3.5 litres of acid solution. Connect the regenerant inlet and compressed air pipeline to the regenerant tank. Open F and H to allow acid injection to takes place for a period 10 minutes by adjusting the air pressure. Close F and H. Repeat the process by filling the regenerant tank with remaining 3.0 litres of acid solutioon and repeat the process by opening F and H.
After acid injection close F and H and stop compressed air supply.
8. Acid Rinse
Connect the regenerant inlet to raw water supply. Open F and H and rinse for 20 minutes. Close F and H.
9. Air Mixing
Connect air inlet to air blower, open D and air inlet valves. Give air mixing for 20 minutes. Close D and air inlet.
10. Final Washing
Open A and C and wash the resins with water through raw water inlet until the conductivity reads 1 micro seimen/cm.
11. If the right conductivity reading is not obtained, perform air mixing and final washing process once again to get the conductivity.