Question

Polluted water having low body are most economically treated in

Answer 1

Answer:  polluter water have low  body are moat economically tread in the following

Explanation: 1 . sedimentation tanks

                      2 . oxidation ponds

                      3 . sludge digester

                      4 . clarifier  

                                                               i hope it will help u

Answer 2

Answer:

Oxidation Ponds

Explanation:

Polluted water which has low Biochemical Oxygen Demand require less treatment.

So we don't need to go for complete sedimentation and Sludge digester.

We require only Oxidation Ponds for economical treatment.