Tag: sewage treatment

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Questions Related to sewage treatment

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 a filtration plant, water is filtered using layers of 

  1. sand

  2. oil

  3. sand and clay

  4. sand, fine gravel and medium gravel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A standard slow or rapid sand filter in a water treatment plant uses graded layers of sand and gravel to effectively trap and remove impurities from the water.

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

Water before treatment contains

  1. Nitrogen

  2. Oxygen

  3. Phosphorus

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

Untreated water often contains nutrients like nitrogen and phosphorus, which are common pollutants from agricultural runoff and sewage that can lead to eutrophication.

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 is/are useful ways of utilizing waste water?

  1. Certain pollutants in sewage water can become fertilizer for various crops.

  2. Waste water can be used for recharging the ground water.

  3. Waste water can be used for irrigation.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Waste water can be used for multiple purposes as mentioned below-
(a) For recharging the groundwater.
(b) It can be used for irrigation.
(c) Treated municipal water can be used for washing cars and watering the gardens.
(c) Certain pollutants in sewage water can be used as fertilizers for various crops.
Therefore, the correct answer is option D.
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 is first stage of waste treatment plant?

  1. Preliminary Treatment

  2. Primary Treatment

  3. Secondary Treatment

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

Preliminary treatment is the first stage of a wastewater treatment plant, involving processes like screening and grit removal to protect downstream equipment.

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

Activated sludge acts as inoculum in:

  1. Primary treatment

  2. Secondary treatment

  3. Tertiary treatment

  4. More that one option
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A.Primary treatment – Removal of large and small particles from sewage through sequential filtration and sedimentation is called primary treatment.

B.Secondary treatment – It involves biological process of microbial degradation of organic matter contained in sewage effluent. In this activated sludge acts an inoculum.

C.Tertiary treatment – There is no occurrence of tertiary sewage treatment.

So, the correct option is ‘Secondary treatment’.    

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

What does sewage consist of?

  1. Fuel waste

  2. Faeces

  3. Paper waste

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

Sewage is wastewater that contains various contaminants, including human waste or faeces. While it may contain paper or nutrients, faeces is the primary defining component of domestic sewage.

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 process involved in waste water convertion into drinkable water?

  1. Precipitation

  2. Condensation

  3. Filtration

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

Filtration is a key physical process in wastewater treatment used to remove suspended solids and impurities. While other processes like sedimentation or chlorination are also used, filtration is a fundamental step in cleaning water.

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 parameter is very important in sewage treatment?

  1. Temperature

  2. Chemical

  3. Decomposition

  4. All of them
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Temperature is a critical parameter in sewage treatment because it significantly affects the rate of biological decomposition and the solubility of oxygen. While chemicals and decomposition are important, temperature regulates these biological and chemical processes.

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

Sewage consist of 99.9% of

  1. Oxygen

  2. Nutrients

  3. Waste

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

Domestic sewage is composed primarily of water, typically accounting for about 99.9 percent of the total volume. The remaining small fraction consists of dissolved and suspended solids, organic matter, and other contaminants.

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 a waste water treatment, plants are examples of

  1. Natural Ecosystem

  2. Artificial Ecosystem

  3. Lotic

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

In the context of wastewater treatment, constructed wetlands or specific plant-based treatment systems are considered artificial ecosystems. They are engineered by humans to perform specific ecological functions like purification.