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Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Primary sludge is used for

  1. Preparation of compost

  2. Preparation of manure

  3. Biogas production

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Primary sludge is the solid material removed during the primary sedimentation process of sewage treatment. It is organic-rich and can be processed via anaerobic digestion for biogas production, composting, or manure preparation.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Methanogens converts

  1. Methyl alcohol into methane

  2. Formic acid into methane

  3. Acetic acid into methane

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanogens are anaerobic archaea that produce methane as a metabolic byproduct. They are capable of utilizing various substrates, including acetate, formate, and methanol, to generate methane.

Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Primary treatment of sewage is

  1. Physical process

  2. Biological process

  3. Chemical process

  4. Biochemical process
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Primary treatment of sewage involves physical processes like sedimentation and filtration to remove large particles and suspended solids. It does not involve biological or chemical degradation.

Multiple choice zoology microbes in human welfare biogas environmental use of microorganism microbes in waste treatment and biogas

Sewage treatment process includes all of these features, except

  1. A small part of the activate sludge is pumped back into the aeration tank to serve as incoculum

  2. Activated sludge cannot be used in anaerobic digestion process

  3. Anaerobic bacteria digest aerobic bacteria in sludge digesters

  4. Transfer of primary effluent in aeration tanks
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The process of removal and digestion of inorganic and organic waste present in the sewage water is called sewage treatment.

A. The flocs of bacteria obtained after treatment of the sewage water is called activated sludge. A small part of it is pumped back into the aeration tank which will act as inoculum and will multiply to start the digestion of organic compounds again.
B. Activated sludge can be anaerobic bacterium as well.
C. In sludge digesters, the digestion of organic compounds occurs.
D. Primary effluent is transferred to the aeration tanks for the purpose of digestion through aerobic bacteria.
Hence, the correct answer is 'Anaerobic bacteria digest aerobic bacteria in sludge digesters'.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Anaerobic sludge digesters and inoculums are part and parcel of _____________.

  1. Primary sluge

  2. Activated sludge

  3. BOD

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

Anaerobic digestion is a collection of a process by which microorganism break down biodegradable material in the absence of oxygen and some of these processes are used in the waste Industries to manage the waste. Primary sludge is a result of the capture of suspended solids and organics materials. In the primary process of waste management, the material is treated in a variety of ways. During the biological treatment of the waste a part of activated sludge is used as inoculum and they are passed into the last tank which is known as anaerobic sludge digester. The microorganism present in the sludge gets killed.


So, the correct option is 'Primary sludge'.

Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Which of the following is correct about biogas?

  1. Methane gas is produced along with ethyl alcohol by methanogen

  2. Methanogens acts on cellulose and release biogas

  3. Biogas is produced by thunder and lightening
  4. Maximum gas found in biogas is $CO _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Methanogens are present in the rumen of cattle that is present in dung as well. Methanogens acts on the cellulose content of the and  It helps in the production of methane gas that is a component of biogas.
  • Hence Methanogens acts on cellulose and release biogas is a correct statement.
  • So, the correct answer is 'Methanogens acts on cellulose and release biogas'.
Multiple choice zoology bioenergy biogas environmental use of microorganism microbes in waste treatment and biogas

Biogas production is rate limited by

  1. Production of methane

  2. Cellulose digestion

  3. Conversion of monomers to organic acids

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The breakdown of complex polymers like cellulose into simpler monomers is the rate-limiting step in anaerobic digestion. This hydrolysis step is often the slowest part of the process.