Tag: sewage disposal

Questions Related to sewage disposal

Pyrolysis of wood yields

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  1. Alcohol

  2. Charcoal

  3. Charcoal and wood gas

  4. Charcoal, wood gas, tar and oil

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Correct Option: D
Explanation:
Pyrolysis is the thermal composition of a material by heating it at a very high temperature. Pyrolysis of wood occurs at a temperature of  200–300 °C. Many products are formed from pyrolysis of wood like charcoal, tar, wood gas and wood oil. Charcoal is the residue left after burning of wood. It is rich in carbon. Wood gas and wood oil are used as fuels. Tar is a black liquid and used as filler in roads.
So, the correct answer is 'Charcoal, wood gas, tar and oil'.

Pyroligneous acid produced during pyrolysis of wood is

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  1. Creosote

  2. Acetic acid

  3. Methyl alcohol

  4. Ammonia

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Correct Option: B

The buildings which do not have a sewage system can _____________.

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  1. Construct drainage tanks

  2. Construct septic tanks

  3. Construct sewage water bodies

  4. Construct septic canals

Show answer
Correct Option: B
Explanation:

Septic tanks are underground tanks in which sewage is collected and allowed to decompose with the use of bacteria. Drainage tanks are used to remove water. Sewage pollutes the water bodies when directly discharged into water bodies like river. Septic canal is a tubular passageway for the disposal for sewage.

Thus, the correct answer is option B.

In compositing, volume of solid waste is

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  1. Reduced

  2. Enhanced

  3. Burnt

  4. Removed

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Correct Option: A

Pollution due to sewage can be reduced by 

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  1. Creating separate chemical toilets.

  2. Constructing septic tanks.

  3. Letting off drainage in rivers.

  4. Both A and B.

Show answer
Correct Option: D
Explanation:
A very large fraction of our people defecates in the open, on dry riverbeds, on railway tracks, near fields and many a time directly in water. Untreated human excreta is a health hazard. It may cause water pollution and soil pollution. Both the surface water and groundwater get polluted.
  • A septic tank is an underground chamber made of concrete, fiberglass or plastic through which domestic wastewater flows for basic treatment. Settling and anaerobic processes reduce solids and organics, but the treatment efficiency is only moderate. Septic tank systems are a type of simple onsite sewage facility.
  • Chemical toilet is a toilet that is not connected to a sewage system but has a compartment in which waste is treated with chemicals for temporary storage.
  • Letting off drainage in rivers will cause water pollution.
So, the correct answer is 'Both A and B'

Which is correctly matched?
$1$. Arsenic poisoning- Black foot disease
$2$. Secondary Effluent treatment- Biological process
$3$. Pyrolysis- Solid soil waste disposal
$4$.

Tubifex- Water pollution indicator


$5$. Biomagnification - Degradable pollutants

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  1. $1, 2, 3, 5$

  2. $1, 3, 4, 5$

  3. $2, 3, 4, 5$

  4. $1, 2, 3, 4$

  5. $1, 2, 4, 5$

Show answer
Correct Option: D
Explanation:
  1. Arsenic poisoning causes black foot disease as arsenic is a carcinogen that results in darkening of the skin and abdominal issues.
    2. Secondary treatment to the effluents involves a biological process in which the organic matter in the effluent is decomposed by the bacteria and fungi.
    3. Pyrolysis is the process in which the solid soil is subjected to the high temperature to decompose it into ash.
    4. Tubifex is a roundworm that can sustain the polluted water that has low levels of dissolved oxygen and heavy metal deposition. So, its growth in any water body indicates water pollution.
    5. Biomagnification is the ability of the non-degradable pollutants to stay in the adipose tissues of the living organisms and persist in higher concentration.
    Hence, the correct answer is '1,2,3,4'.