Tag: microbes in waste treatment and biogas

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Multiple choice physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

In a wind mill the electric energy is converted into mechanical energy.         

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.
Windmills, like waterwheels, were among the original prime movers that replaced animal muscle as a source of power. They were used for centuries in various parts of the world, converting the energy of the wind into mechanical energy for grinding grain, pumping water, and draining lowland areas.
Kinetic energy of the wind is transformed into mechanical energy of the turning windmill. This can be used to turn a generator to generate electricity. The original energy to cause the wind to blow came from the sun. Uneven heating of the earth's surface causes wind.
Hence, the statement is false.

Multiple choice physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

65% by volume is hydrogen gas in the biogas. 

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Answer is B.

Biogas is characterized based on its chemical composition and the physical characteristics which result from it. It is primarily a mixture of methane (${ CH } _{ 4 }$) and inert carbonic gas (${ CO } _{ 2 }$). However the name 'biogas' gathers a large variety of gases resulting from specific treatment processes, starting from various organic waste - industries, animal or domestic origin waste, etc . 
Hence, the statement is false.

Multiple choice physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

The gas obtained by the fermentation of biomass is :

  1. LPG

  2. CNG

  3. hydrogen

  4. biogas
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fuel-grade ethanol is one energy source that has great potential for being generated from biomass. The gas obtained by the fermentation of biomass is called biogas.

Multiple choice physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

Gobar gas is a:

  1. solid fuel

  2. liquid fuel

  3. primary fuel

  4. secondary fuel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas is a type of secondary energy because biomass (primary energy) is used to produce biogas by anaerobic digestion into more efficient and higher value fuel.Biogas is also called gobargas as made by waste remains of plants and animals.

Multiple choice physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy biogas environmental use of microorganism microbes in waste treatment and biogas

Which of the following is released from biomass?

  1. Cow-dung

  2. Methane

  3. Oxygen

  4. Helium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Major gases released from biomass are methane ($CH _4$), carbon dioxide ($CO _2$), hydrogen ($H _2$) and hydrogen sulphide ($H _2S$).

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

Activated sludge should have the ability to settle quickly so that it can:

  1. be rapidly pumped back from sedimentation tank to aeration tank

  2. absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank

  3. be discarded and anaerobically digested

  4. absorb colloidal organic matter.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The activated sludge have to settle quickly so that it can be pumped back to the aeration tank. So, the correct option is 'be rapidly pumped back from sedimentation tank to aeration tank'

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

In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called as:

  1. inactivated sludge

  2. activated sludge

  3. primary sludge

  4. secondary sluge
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In the secondary treatment, the effluent is passed into a settling tank where the bacterial flocs are allowed to sediment and the sediment is called activated sludge.
So, the correct option is 'activated sludge'
Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

The primary treatment of removal of:

  1. dissolved impurities

  2. stable particles

  3. toxic substances

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

The primary treatment involves physical removal of particles from the sewage through filtration and sedimentation. These are removed initially by sequential filtration which removes the floating debris and then grit is removed by sedimentation. 

So, the correct option is 'Option A' .

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

Wastewater treatment generates a large quantity of sludge, which can be treated by:

  1. anaerobic digesters

  2. floc

  3. chemicals

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

Wastewater treatment generates a large quantity of activated sludge during secondary treatment which is used as a inoculum and a small part of it is pumped back to the large aeration tanks whereas the remaining part of that sludge is treated by anaerobic sludge digesters anaerobically. During this digestion, bacteria produces a mixture of gases called biogas. 

So, the correct option is 'Option A' .

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

Activated sludge should have the ability to settle quickly so that it can

  1. Be rapidly pumped back from sedimentation tank aeration tank.

  2. Absorb pathogenic Bactria present in waste water while sinking to the bottom of the settling tank

  3. Be discarded and anaerobic ally digested

  4. Absorb colloidal organic matter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to the aeration tank, where it can start the process of decomposition of the organic matter again. Activated sludge has filamentous bacteria that are capable of performing the aerobic digestion of organic waste is the sewage water.

Hence, the correct answer is 'Be rapidly pumped back from sedimentation tank aeration tank'