Tag: microbial pollution control

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Questions Related to microbial pollution control

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

In secondary treatment, solid reducers, ranges from

  1. 70-92%

  2. 80-90%

  3. 20-60%

  4. 10-70%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secondary treatment typically removes 70-92% of solids and BOD (Biochemical Oxygen Demand) from wastewater. The lower range (70-80%) represents less efficient systems, while well-operated plants achieve 85-92% removal.

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

Secondary treatment is also known as ________________.

  1. Biological Treatment

  2. Preliminary Treatment

  3. Secondary Treatment

  4. Tertiary Treatment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Secondary treatment is known as biological treatment because it relies on aerobic bacteria and other microorganisms to consume organic waste.

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

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

  1. Wind

  2. Temperature

  3. Water

  4. Micro-organisms
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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 ____________.

  1. Sewage

  2. Crop cultivation

  3. Rain

  4. Soil erosion
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water pollution is primarily caused by the discharge of untreated or partially treated sewage, which introduces organic waste and pathogens into water bodies.

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

Select the correct statement from the following.

  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.
Reveal answer Fill a bubble to check yourself
C Correct answer
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
Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

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

  1. i, iv, ii, iii

  2. ii, iv, i, iii

  3. ii, i, iv, iii

  4. iv, ii, iii, i
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The sequence is: (ii) filtration to remove debris, (i) aerobic treatment to reduce BOD, (iv) anaerobic digestion of sludge, and (iii) production of biogas.

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

The primary treatment of sewage water involves.

  1. Sludge digestion

  2. Aerobic bacterial activity

  3. Anaerobic bacterial activity

  4. Filtration and sedimentation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Primary treatment is a physical process that involves the removal of large floating debris through filtration and the settling of solid particles through sedimentation.

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

Sewage water is purified by

  1. Microorganisms

  2. Light

  3. Fishes

  4. Aquatic plants
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Which one is a biological in sewage treatment?

  1. Primary treatment

  2. Secondary treatment

  3. Tertiary treatment

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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'