A. Answer the following in not more than 20 words.
1. What is municipal sewage?
2. What are 'black water' and 'grey water in the context of sewage?
3. What are the three sources of liquid waste?
4. What do you understand by 'treating' waste water?
5. Mention one use that the sludge from sewage treatment can be put to.
6. Mention two things we can do to reduce the burden on the waste water disposal system.
B Answer the following in not more than 40 more
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