What are the sources of waste water and what are the processes and contaminants involved in its treatment?

Here are the answers to the questions from the passage:

a) Waste water is released from homes, industries, hospitals, offices, and other users.

b) The processes involved in the treatment of waste water are physical, chemical, and biological processes.

c) The contaminants present in sewage water include dissolved impurities, suspended impurities, disease-causing bacteria, other microbes, human faeces, animal waste, oil, urea, pesticides, herbicides, fruit, and vegetable waste.

d) Examples of water-borne diseases are cholera, typhoid, and dysentery.