QUESTION
ETP system for food, personal care products and printing waste - Foul odour in treated water

We have a Activated sludge extended aeration type ETP treating our effluent of foods, personal care products and printing and also sewage waste.  We have two aeration tanks (7.70*4*4.30)m , 120 kl each. Also ETP has a capacity of 350 KLD.
Inlet BOD IS AROUND 300-400 AND COD AROUND 1200-2000.
Now since sometime the outlet parameters are out of limit and the treated water is giving odour and has a black hazy colour. Also SV30 is more than 450. Please give us a solution and possible causes.

Gautam
gautam.thapliyal@itc.in

by
25 March 2008