Question

name the following
1)any four organic impurities present in sewage
2) the gas produced during anaerobic decomposition of sludge
3) some diseases caused by untreated sewage
4) various types of contaminants that are present in sewage

Answer 1

1 . vireces
2. co2 gas
3. cholara typhoid

Answer 2

1]
a) fruits and vegetables wastes.
b)