High BOD,COD and foaming in treated effluent - Need ways to reduce


I am working in light Engineering (Bicycle manufacturing) industry, having Effulent tretament plant.
We are facing following probelm to meet required parameters of Pollution Control Board. The problems are as under -

1. BOD & COD and Oil & Grease parameters are high in treated water. How to reduce these.

2. We are using Caustic Soda in our plant for cleanin the Oil from surface of the material, which causes foaming in treated water, How to minimize this problem.

3. If any book or agency available near Gwalior kindly intimate me through mail.

Hoping for early reply.

Thanking you,

Sandeep Srivastava