SOP on Effluent Treatment Plant (ETP)Cleaning , Operation & Maintenance

(1) Drain out the treatment tank for left overs. 

(2) Fill the tank with tap water, close the lid and start the stirrer for 15 minutes. 

(3) Drain out the washing through sludge collector tanks and carbon bed. 

(4) Take out the sludge collecting bags from the sludge collectors and rinse the tanks with tap water. 

(5) Finally clean the effluent treatment plant by filling the tap water in treatment tank and drain out through sludge collector tanks and carbon bed. 

(1) Fill the treatment tank with about 300 liters of tap water.

(2) Add the effluents (solids/liquids) to the tank and stir for 15 minutes. 

(3) Check the pH of mixed effluent water.

(a) If pH is acidic (i.e. less than 5.0), add a sufficient quantity of 10% w/v solution of lime to raise the pH 7.0  0.2. 

(b) If pH is alkaline (i.e. more than 9.0), add 10% w/v solution to Alum or Ferrous sulphate to drop the pH 7.0  0.2.

(4) Stir the mixture for 30 minutes. 

(5) Dissolve 25gm of Polyelectrolyte in 2 liters of tap water, add to the tank and stir for 30 minutes. 

(6) Switch off the stirrer and allow the mixture to separate for 2 hours. 

(7) Pass the separated solids in sludge collector tanks containing jute bags. 

(8) Take out the jute bags, completely dry in air and sunlight. Remove the dried sludge in Polythene bags and send for deep burial in land far away from the residential area. 

(9) Pass the treated water through carbon bed to drainage holes. 

(10) Collect the treated water at least once in a month for testing and record the results. 

(1) Clean the ETP at least once in a week. 

(2) Clean the sludge collecting bags every time after use. 

(3) Change the carbon bed at least once in a month. 

(4) Grease the electrically driven motor at least once in a month.