Question

1. What does waste water contain ?​

Answer 1

• Waster water contains harmful bacteria, chemical and viruses which is not good for our health.

Answer 2

Answer:

Untreated sewage may contain water; nutrients (nitrogen and phosphorus); solids (including organic matter); pathogens (including bacteria, viruses and protozoa); helminthes (intestinal worms and worm-like parasites) ; oils and greases; runoff from streets, parking lots and roofs; heavy metals (including mercury).