Environmental Studies · Chemistry

Water and Wastewater Treatment

1,423 Questions

This topic deals with water purification, wastewater treatment methods, and industrial effluent management. It includes questions on filtration, disinfection, and water hardness removal. These concepts are tested in environmental science and engineering exams.

Water purificationWastewater treatmentBioremediation strategiesWater hardness removalIndustrial effluent management

Water and Wastewater Treatment Questions

Multiple choice biology human influences on the environment effects of water pollution effect of water pollution water pollution and its control

Which is the correct ascending arrangement of BOD of sewage(S) distillery effluent(DE), paper mill effluent(PE) and sugar mill effluent(SE)?

  1. SE$<$PE$<$S$<$DE
  2. PE$<$S$<$SE$<$DE
  3. S$<$DE$<$PE$<$SE
  4. SE$<$S<$PE$<$DE
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • BOD is the Biological Oxygen Demand that is created when there is an excessive quantity of the organic matter in the water body and its decomposition is initiated by the decomposing bacteria. More the amount of organic waste, the higher will be the BOD and so more will be pollution in the water body. 
  • This causes an extreme reduction in the dissolved oxygen and suffocates the aquatic animals. 
  • Distillery effluent is rich in organic waste left from alcoholic fermentation and it has the highest BOD. 
Sugar mill effluent follows the distillery effluent in the concentration of organic content. The sewage water contains the excreta and detergents mixed with it. 
  • Papermill effluent has the lowest concentration of the organic mass.

Hence, the correct answer is 'PE< S< SE< DE'.

Multiple choice

The process of removing the salt from salt water

  1. Permeability

  2. Desalination

  3. None of these

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

Desalination is the industrial process of removing salt and other minerals from saline water to make it suitable for human consumption or irrigation.

Multiple choice chemistry water too little to waste pollution of water water pollution planet earth

Potassium permanganate is used for purifying drinking water, because:

  1. it is a sterilising agent

  2. it dissolves the impurities of water

  3. it is a reducing agent

  4. it is an oxidising agent
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potassium permanganate is an inorganic chemical compound and it is a strong oxidizing agent. Potassium permanganate is used in water treatment to remove odor-causing compounds and is also used to remove iron and manganese in water.

Multiple choice bio-chemistry absorption by roots - the processes involved osmotic relations of plant cells transport across membrane imbibition and its importance

Which of the following statements does not apply to reverse osmosis?

  1. It is used for water purification

  2. In this technique, pressure greater than osmotic pressure is applied to the system

  3. It is a passive process

  4. It is an active process
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Osmosis is passive transport where water follows down the gradient across a semi-permeable membrane from a higher concentration to a  lower concentration. Reverse osmosis simply means that the cumulative pressure gradients cause the flow of water molecules to go against the osmotic pressure gradient from a lower concentration to the higher concentration. 
As the process of reverse osmosis requires energy for transporting molecules against the concentration gradient, it is an active process.

Multiple choice evs - i sources of water the lithosphere and the hydrosphere first aid safety and first aid

Distilled water is commonly used across manufacturing and within industry when the highest quality of water is required.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Distilled water is commonly used across manufacturing and within industry when the highest quality of water is required.

Distilled water is water free from impurities through distillation process. Distillation involves boiling the water and then condensing the steam into a clean container.
Where exceptionally high purity water is required, double distilled water is used.
Therefore, the correct answer is option A.

Multiple choice

What is the recommended way to purify water in the wilderness?

  1. Boiling

  2. Filtering

  3. Using iodine tablets

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

Boiling water is the most effective way to kill bacteria and other microorganisms, making it safe to drink.

Multiple choice

Which of the following is a common method for purifying water in the wilderness without boiling it?

  1. Using a water filter

  2. Adding iodine tablets

  3. Exposing to sunlight

  4. Using a chemical disinfectant
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Water filters remove impurities and microorganisms from water, making it safe to drink.

Multiple choice

What are some of the things that you can do to improve water quality in your community?

  1. Reduce your water usage.

  2. Dispose of waste properly.

  3. Support water quality protection initiatives.

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

There are a number of things that you can do to improve water quality in your community, including reducing your water usage, disposing of waste properly, and supporting water quality protection initiatives.

Multiple choice

What are some of the things that businesses can do to improve water quality?

  1. Reduce their water usage.

  2. Dispose of waste properly.

  3. Invest in water-efficient technologies.

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

There are a number of things that businesses can do to improve water quality, including reducing their water usage, disposing of waste properly, and investing in water-efficient technologies.

Multiple choice

How can water pollution be reduced at track and field events?

  1. Using biodegradable products

  2. Properly disposing of waste

  3. Minimizing the use of water

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

All of the above actions can help to reduce water pollution at track and field events.

Multiple choice

What is the term for the process of reusing water that has already been used once?

  1. Water Recycling

  2. Water Conservation

  3. Water Treatment

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

Water recycling involves reusing water that has already been used once, typically for non-potable purposes.

Multiple choice

What is the term for the process of treating wastewater so that it can be reused?

  1. Water Recycling

  2. Water Conservation

  3. Water Treatment

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

Water recycling involves treating wastewater so that it can be reused, typically for non-potable purposes.

Multiple choice

What is the term for the process of reducing water consumption without compromising on its intended use?

  1. Water Conservation

  2. Water Recycling

  3. Water Treatment

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

Water conservation involves reducing water consumption without compromising on its intended use.