Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process

Solution

Secondary treatment or Biological treatment :
* Primary effluent is passed into large aeration tanks with constant mechanical agitation and air supply. * Useful aerobic microbes grow rapidly and form flocs.
* Flocs are masses of bacteria and consumes organic matter and thus reduce the biochemical oxygen demand (BOD).
* When BOD of sewage has reduced, the effluent is passed into Settling tank.
* Here, the bacterial flocs settle and sediment is called activated sludge.
* A small part of the sludge is used as an inoculum in the aeration tank and the remaining part is passed into large tanks called anaerobic sludge digesters.
* In the digesters, heterotrophic microbes anaerobically digest bacteria and fungi in sludge producing mixture of gases such as methane, H2S, CO2 which forms the biogas.

Some More Questions From Environmental Issues Chapter

Fill in the blanks with suitable words :
1. Increase in concentration of soluble salts in the soil is called.........

2. Aforestation can check the advancement of......... .

3. DDT is a serious pollutant as it is a.........pollutant and undergoes......... .

4 .........plant has become a troublesome weed in agricultural fields.

5 .........are major aerosol pollutant present in jet aircraft emission.

For Daily Free Study Material Join wiredfaculty

Environmental Issues

Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process

Some More Questions From Environmental Issues Chapter

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 ?

Write “True” or “False” :

Coin one word for the following statements :
Discarded computer parts like monitors, key boards, mouse etc.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Phone Number

Email Address

Location

For Daily Free Study Material Join wiredfaculty

Environmental Issues

Secondary treatment of the sewage is also called Biological treatment. Justify this statement and explain the process

Some More Questions From Environmental Issues Chapter

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 ?

Write “True” or “False” :

Coin one word for the following statements : Discarded computer parts like monitors, key boards, mouse etc.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Coin one word for the following statements :
Discarded computer parts like monitors, key boards, mouse etc.