1.

The following are the sewage treatment processes :1. Primary sedimentation2. Screening3. Grit removal4. Secondary sedimentation.When only preliminary treatment is to be given for sewage, select the required treatment proceses including their correct sequence from the codes given below:

A. 2, 3
B. 2, 3, 1
C. 1, 2, 3, 4
D. 3, 1, 2, 4
Answer» C. 1, 2, 3, 4


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