+91-8076753736 support@wiredfaculty.com

Sponsor Area

Environmental Issues

Question

Wired Faculty App

What are various constituents of domestic sewage ? Discuss the effects of sewage discharge on a river.

Solution

Constituents of domestic sewage.
It mainly consists of biodegradable organic matter
(i) suspended solids e.g., sand, silt and clay.
(ii) colloidal materials eg. faecal matter, bacteria, disease causing microbes, cloth fibre, plastic and paper.
(iii)Dissolved materials, e.g. nutrients (nitrates, ammonia, phosphates, sodium and calcium).

Effects of Sewage discharge on a river :
(i) The micro-organisms in the sewage consume alot of oxygen and this pose a problem for other organisms in the river.
(ii) The Biochemical oxygen demand (BOD) of the river increases.
(iii) Presence of large amount nutrients causes excessive growth of planktonic algae or Algal bloom which imparts distinct color and degrades the quality of water and fish mortality. Some bloom-forming algae are extremely toxic to human beings and animals.
(iii) Various disease causing microbes may cause outbreak of serious diseases, such as, dysentery, typhoid, jaundice, cholera, etc

Some More Questions From Environmental Issues Chapter

What is the term for the inflammation of cornea due to high absorption of UV-B radiation :

Smog is a mixture of :

WHO’s recommendations about the industrial noise limit is of :

Which of the atmospheric layer contains ozone layer ?

The amount of dissolved oxygen required by the microorganisms to degrade the organic wastes present in water is called ?

The cause of acid rain is :

Which one of the following causes ozone depletion ?

What disease is caused due to consumption of fishes captured from water contaminated with mercury ?

Which one of the following is not a green-house gas ?

Which gas contributes the maximum in global warming ?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation