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

Which one of the following is pure water?

  1. Rain water

  2. Filter water

  3. Tubewell water

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

Rain water is the purest natural form of water as it evaporates from water bodies, condenses, and falls before contacting ground surfaces. Distilled water is purer but processed artificially. Filter and tubewell water contain dissolved minerals and impurities from soil and pipes.

Multiple choice

What is the full-form of the water purification technology - RO?

  1. Reverse Oxidized

  2. Re-Oxidized

  3. Re-Oxygenated

  4. Reverse Osmosis

  5. Revert Oxygen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Reverse osmosis (RO) is a water purification technology that uses a semi-permeable membrane. This membrane-technology is not properly a filtration method. In RO, an applied pressure is used to overcome osmotic pressure, a colligative property, that is driven by chemical potential, a thermodynamic parameter.

Multiple choice

Match the following:

 
a. Sedimentation 1. Separates the insoluble and suspended solids of various sizes from a liquid using a filter
b. Decantation 2. Settles down heavier insoluble particles in a mixture of water
c. Filtration 3. Transfers the clear liquid without disturbing the insoluble heavy particles

  1. a - 2, b - 3, c - 1

  2. a - 2, b - 1, c - 3

  3. a - 1, b - 2, c - 3

  4. a - 3, b - 2, c - 1

  5. a - 1, b - 3, c - 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option.  

Multiple choice

Which of the following come under secondary treatment systems of waste water?

  1. Sedimentation
  2. Trickling filters
  3. Activated sludge
  4. Phosphorus removal Select the correct answer.

  1. 1 and 2

  2. 1 and 3

  3. 2 and 3

  4. 3 and 4

  5. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Secondary treatment systems are classified as: Fixed-film or attached growth systems: It includes trickling filters, biotowers, and rotating biological contactors, where the biomass grows on media and the sewage passes over its surface. Suspended-growth systems: It include activated sludge, where the biomass is mixed with the sewage and can be operated in a smaller space than trickling filters that treat the same amount of water.