Question

What are the two most common water-borne diseases in the following?
   * traveler's diarrhea
   * cholera
Which of the following are secondary treatment steps in wastewater treatment? (grit chamber/activated sludge treatment)

Which of the following are non-point sources of water pollution? (bar screening/acid rain)

Answer 1

Question1:

(a) Traveler's diarrhea and cholera

Both diseases are spread by contaminated food and water. Cholera is caused by vibrio cholerae.

(b) Activated sludge treatment.

Grit chamber is tank in primary treatment whereas activated sludge is part of secondary treatment which include biomass of microbes used for biological treatment.

(c) Acid rain

Non-point source of pollution is the source which could not defined because it spread by many factors. Point sources are single identified source of pollution, i.e., Bar screening, industrial waste.