Tag: wastewater story

Questions Related to wastewater story

Which parameter is very important in sewage treatment?

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  1. Temperature

  2. Chemical

  3. Decomposition

  4. All of them

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Correct Option: A

Sewage consist of 99.9% of

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  1. Oxygen

  2. Nutrients

  3. Waste

  4. Water

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Correct Option: D

In a waste water treatment, plants are examples of

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  1. Natural Ecosystem

  2. Artificial Ecosystem

  3. Lotic

  4. lentic

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Correct Option: B

Primary treatment reduces solids, ranges from

biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

  1. 20-60%

  2. 10-50%

  3. 20-70%

  4. 40-60%

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Correct Option: D

Which of the following are correctly matched ? 
1. Arsenic poisoning - Black-foot disease
2. Secondary effluent treatment - Biological process 
3. Pyrolysis - Waste disposal
4. Tubifex - Water pollution indicator 
5. Biomagnification - Degradable pollutants 

biology wastewater story basics of water pollution sewage treatment wastewater treatment - need and methods personal and public cleanliness who will do this? water borne disease hygiene - a key to healthy life

  1. 1, 2, 3 and 5

  2. 1, 3, 4 and 5

  3. 2, 3, 4 and 5

  4. 1, 2, 4 and 5

  5. 1, 2, 3 and 4

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Correct Option: E
Explanation:

Biomagnification refers to increase in concentration of the toxicant at successive trophic levels. This happens because a toxic substance accumulated by an organism cannot be metabolised or excreted, and is thus passed on to the next higher trophic level. This phenomenon is well known for mercury and DDT. 

What involved in wastewater final treatment?

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  1. BOD

  2. Chlorination

  3. Sedimentation

  4. All of above

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Correct Option: B

Waste water contains algae, fungi, bacteria and

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  1. Crocodiles

  2. Snakes

  3. Rotifers

  4. Tigers

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Correct Option: C

During sewage treatment the microorganisms participate under which step?

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  1. Primary

  2. Secondary

  3. Teritiary

  4. None of the above

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Correct Option: B
Explanation:

Sewage treatment generally involves three stages, called primary, secondary and tertiary treatment. 

Primary treatment consists of temporarily holding the sewage in a quiescent basin where heavy solids can settle to the bottom while oil, grease and lighter solids float to the surface. 
Secondary treatment removes dissolved and suspended biological matter. Secondary treatment is typically performed by indigenous, water-borne micro-organisms in a managed habitat. Secondary treatment may require a separation process to remove the micro-organisms from the treated water prior to discharge or tertiary treatment. 
Tertiary treatment allows rejection into a highly sensitive or fragile ecosystem like estuaries, low-flow rivers, coral reefs etc. 

The domestic sewage in large cities

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  1. Has a high BOD level, as site containes both aerobic and anaerobic bacteria.

  2. Is processed by aerobic and then anaerobic bacteria in the secondary treatment in the Sewage Treatment Plants (STPs).

  3. When treated in STPs does not really require the aeration step as the sewage contains adequate oxygen.

  4. Has very high amounts of suspended solids and dissolved salts.

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Correct Option: B
Explanation:
Secondary (biological) treatment is the method to remove the dissolved organic matter that escapes primary treatment. This is achieved by microbes consuming the organic matter as food, and converting it to carbon dioxide, water, and energy for their own growth and reproduction. The biological process is then followed by additional settling tanks to remove more of the suspended solids. In this method, waste water first treated with microbes aerobically and anaerobically in anaerobic digester tank.

Sewage water is purified for recycling by the action of 

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  1. Light

  2. Micro-organisms

  3. Aquatic plants

  4. Fishes

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Correct Option: B
Explanation:

Domestic sewage primarily contains biodegradable organic matter, which readily decomposes by bacteria and other micro-organisms, which can multiply using these organic substances as substrates and hence utilise some of the components of sewage. It is possible to estimate the amount of biodegradable organic matter in sewage water by measuring biochemical oxygen demand (BOD).  

Microorganisms involved in biodegradation of organic matter in the receiving water body consume a lot of oxygen, and as a result there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures.