Tag: microbial pollution control

Questions Related to microbial pollution control

In secondary treatment, solid reducers, ranges from

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. 70-92%

  2. 80-90%

  3. 20-60%

  4. 10-70%

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Correct Option: A

Secondary treatment is also known as ________________.

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Biological Treatment

  2. Preliminary Treatment

  3. Secondary Treatment

  4. Tertiary Treatment

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Correct Option: A

Which of these is not a key factor that helps in the process of decay?

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Wind

  2. Temperature

  3. Water

  4. Micro-organisms

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Correct Option: A
Explanation:

Decay is what happens when dead animals and plants break down. The key factors involved in decay are: Temperature, Amount of oxygen, Amount of water and the presence of microorganisms. Microorganisms are important in decay. For example, they are used to break down human waste (sewage) and plant waste (compost). Decay recycles important nutrients for plant growth.

Air pollution is caused by transport exhaust fumes and emission of gases like $SO 2$, $CO _, NO _2$ from industries. Similarly, water pollution is caused by ____________.

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Sewage

  2. Crop cultivation

  3. Rain

  4. Soil erosion

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Correct Option: A

Passage of effluents into oxidation tank is for

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Primary treatment

  2. Secondary treatment

  3. Tertiary treatment

  4. Both A and B

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Correct Option: B

Select the correct statement from the following.

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Methanobacterium is an aerobic bacterium found in rumen of cattle.

  2. Biogas commonly called gobar gas is pure methane.

  3. Activated sludge sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.

  4. Biogas is produced by the activity of aerobic bacteria on animal waste.

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Correct Option: C
Explanation:
Methanobacterium is an anaerobic bacterium..
Biogas is a mixture of gases (predominantly methane).
Biogas is produced by the activity of anaerobic bacteria.
Correct answer-C

Identify the correct sequence of steps involved in the treatment of sewage.
(i)   Growth of aerobic microbes to reduce BOD
(ii)  Sequential filtration for removing floating debris
(iii) Production of inflammable gas
(iv) Growth of anaerobic microbes for digestion of bacteria

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. i, iv, ii, iii

  2. ii, iv, i, iii

  3. ii, i, iv, iii

  4. iv, ii, iii, i

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Correct Option: C

The primary treatment of sewage water involves.

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Sludge digestion

  2. Aerobic bacterial activity

  3. Anaerobic bacterial activity

  4. Filtration and sedimentation

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Correct Option: D

Sewage water is purified by

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Microorganisms

  2. Light

  3. Fishes

  4. Aquatic plants

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Correct Option: A
Explanation:

Sewage is composed of organic matter and domestic waste. The pollutants are removed by the sewage treatment process to mitigate it's adverse impact on the environment when it is released. The sewage pass through primary,  secondary and tertiary treatment. The microorganisms by aerobic and anaerobic metabolism degrade the organic matter in secondary and tertiary treatment respectively making it disinfected.

Hence, the correct answer is 'Microorganisms'.

Which one is a biological in sewage treatment?

zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

  1. Primary treatment

  2. Secondary treatment

  3. Tertiary treatment

  4. All of the above

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Correct Option: B
Explanation:

The sewage treatment unit employs the primary, secondary and tertiary treatment for the complete process. In the primary treatment, filtration of the large and solid waste is done. Then in secondary treatment, the decomposing microbes are used for the breakdown of the organic sewage. So, the secondary treatment is the biological treatment of the waste water. In the tertiary treatment, the chemical treatment is provided to the water.

Hence, the correct answer is 'Secondary treatment'