Tag: sewage treatment

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Multiple choice 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

In our municipal drinking water purification and supply scheme chlorine is added to water because 

  1. Chlorine gives sweat taste to water.

  2. Chlorine kills harmful bacteria.

  3. Chlorine cools water.

  4. Chlorinated water is now a days fashionable.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorine is used for municipal drinking water purification. It is a strong oxidizing agent, hence it kills pathogenic bacteria by oxidation of organic molecules. Chlorine on hydrolysis produces hypochlorous acid that penetrates the pathogenic surface and disintegrates lipids in its cell wall. It also reacts with intracellular enzymes and proteins and deactivates them. Hence chlorination is used to prevent the spread of waterborne diseases such as cholera, dysentery and typhoid. Thus the correct answer is option B.

Multiple choice 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

Polluted water can be purified by using

  1. Microorganisms

  2. Algae

  3. Pesticides

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

The polluted water can be purified using the treatment plants. Activated sludge method refers to floc of microorganisms like bacteria and fungi which are used in the process to break down organic matter into carbon dioxide, water, and other inorganic compounds. There are microbes which grow in the water forming mass or flocs and help in the clearing of the water. These flocs are used in the next round of treatment plants for efficient removal of wastes.

Thus, the correct answer is option A. 

Multiple choice 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

In water treatment plants, the gas used to kill germs is

  1. Nitrogen

  2. Chlorine

  3. Argon

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

Chlorine is widely used in municipal water treatment plants as a disinfectant to eliminate harmful germs and ensure the water is safe for consumption.

Multiple choice 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

A sewage treatment process, in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called a/an:

  1. Cyclic treatment

  2. Activated sludge treatment

  3. Primary treatment

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

Sewage pollution can be prevented by treating sewage, in sewage or effluent treatment plant, before passing into water course. The treatment comprises of primary treatment, secondary treatment and tertiary treatment.
Primary treatment consists of shredding, churning, floatation, screening and sedimentation.
In secondary treatment organic matter is decomposed through sewage fungus by passing sewage through water hyacinth pond, or trickling filter method if passing sewage through thick bed of gravel, or activated sludge method i.e., passing sewage through aerated or oxidation tanks. In activated sludge method, aeration helps in oxidation of sludge or biosolid. The aerobic bacteria can be recycled. The cleared water is now chlorinated with chlorine or perchlorate salts, ozonised or irradiated with ultraviolet light to kill pathogens.
The activated sludge process is a process for treating sewage and industrial wastewaters using air and a biological floc composed of bacteria and protozoa.
The tertiary treatment is physico-chemical treatment for removing turbidity and dissolved substances. Alum, ferric chloride and lime are used for their precipitation.
Therefore, the correct answer is option B.

Multiple choice 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

Chlorine tablet is used to remove .......... from waste water.

  1. Odour

  2. Dark colour

  3. Bacteria

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Chlorine tablets are added to wastewater or drinking water primarily as a disinfectant to kill harmful pathogenic bacteria and microorganisms. They do not remove odor or dark color.

Multiple choice 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

Secondary sewage treatment is mainly a

  1. Biological process

  2. Physical process

  3. Mechanical process

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

Sewage pollution can be prevented by treating sewage before passing into water course in sewage or effluent treatment plant.

The sewage treatment involves -
Primary treatment, secondary treatment and tertiary treatment. 
Primary treatment consists of shredding, churning, floatation, screening and sedimentation. 
In Secondary treatment the organic matter is decomposed by microorganisms and through sewage fungus by passing through water hyacinth pond, trickling filter method or activated sludge method. Aeration helps in oxidation of sludge. 
Tertiary treatment is a physico-chemical treatment for removing turbidity and dissolved substances.
So, the correct answer is 'Biological process'

Multiple choice 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

Pollution can be controlled by:

  1. Sewage treatment

  2. Manufacturing electrically operated vehicles

  3. By checking atomic blasts

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

Checking atomic blasts will reduce radioactive pollution. Sewage pollution can be prevented by treating sewage before passing into water course, in sewage treatment plant or effluent treatment plant (ETP). Electrically operated vehicles will control automobile exhaust and improve the air quality in cities.

Multiple choice 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

Which of the following filter is used for filtration of wastewater?

  1. Sand filter

  2. Grit filter

  3. Cloth

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In wastewater treatment, both sand filters and grit chambers (or grit filters) are standard components used to remove solid particles and debris from the influent.

Multiple choice 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

Rainwater can be preserved by building small reservoirs, contour building and

  1. wall

  2. roof

  3. dams

  4. house
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rainwater harvesting involves capturing and storing water using structures like dams, contour bunds, and reservoirs to prevent runoff and increase groundwater recharge.

Multiple choice 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

When harmful substances get mixed with water it becomes

  1. polluted

  2. muddy

  3. pure

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

Water pollution is defined as the contamination of water bodies by harmful substances, which makes the water unsafe or unsuitable for its intended use.