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 wastewater story sewage treatment wastewater treatment - need and methods conservation

Use of _______ helps in water purification.

  1. Sodium

  2. Alum

  3. Chlorine

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

There are several source of water pollution like industrial effluents, sewage water, radiobiological pollutants etc. Alum is used to clarify water by coagulating soil or mud particles whereas chlorine makes water free from pathogenic bacteria.

Multiple choice allotropes of carbon occurrence of carbon compounds in nature polymers chemistry

Which of the followings may reduce plastic pollution?

  1. Stop using bottled water

  2. Bring your own reusable grocery bags with you when you go to the store

  3. Use a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones

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

We can help to reduce plastic pollution by minimizing the use of plastic and we can do it by stop using bottled water, by bring our own reusable grocery bags when go to the store and by using  a refillable dispenser for your hand soap and dish washing liquid, one large bottle is better than using a bunch of small ones. 

Food and personal product manufacturers, retailers and consumers need to be aware of the benefits of plastics packaging and the need to dispose plastics in a manner which leads to increasing emphasis on recycling. Everyone must understand that the environmental legacy we leave behind for future generations will depend on our resolve to : $REDUCE - REUSE - RECYCLE$.


Multiple choice biology waste generation and management disposal of waste safe disposal of waste solid waste and its management

Scrubbers were used 

  1. To make air free from microorganisms.

  2. To make air free from dust and gases.

  3. To make air free from solid particles.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Scrubbers are air pollution control devices used to remove harmful gases and particulate matter (dust) from industrial exhaust streams. They work by spraying a liquid to capture the pollutants.

Multiple choice applications of adsorption adsorption adsorption and colloids surface chemistry chemistry

Removal of chlorine from drinking water in the food industry is done by adsorption :

  1. True

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

 Activated carbon filtration is a commonly used technology based on the adsorption of contaminants onto the surface of a filter. This method is effective in removing certain organics (such as unwanted taste and odours, micropollutants), chlorine, fluorine or radon from drinking water or wastewater.

Multiple choice evs garbage in, garbage out preparation of compost sewage disposal solid waste management

Enzymatic filters are used for removing

  1. Nitrogen pollutants

  2. Chloride pollutants

  3. Hydrocarbons

  4. Lead
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Hydrocarbon Removal filters are designed to remove hydrocarbons and sediment contaminants from groundwater accumulation in bunded areas, outfalls or as part of any pollution preventative drainage solution on your site, where hydrocarbon risk entering the environment.
The contaminants are absorbed by the smart filtration technology which bond with the hydrocarbon molecules to efficiently encapsulate and solidify hydrocarbons internally in the cartridge.
This allows filtered groundwater to pass unimpeded through the filter.
So the correct answer is 'Hydrocarbons'.
Multiple choice basics of management of water environmental science conservation of resources food production: soil and water management biology

______________ are used for converting saline or brackish water into pure distilled water.

  1. Photo voltaic cells

  2. Solar desalination systems

  3. Solar cookers

  4. Solar water-heating
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Solar desalination systems use solar energy to evaporate saline or brackish water, leaving salts behind and condensing the pure water vapor.

Multiple choice evs water: a precious resource importance of water let's play with water water and its properties water resources and conservation

Treated water is:

  1. distilled water

  2. potable water

  3. rain water

  4. river water
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation
Treated water is the one that has improved quality of water to make it more acceptable for a specific end-use. The end use may be drinking, industrial water supply, irrigation, river flow maintenance, water recreation or many other uses, including being safely returned to the environment.
Distilled water is obtained after condensation of steam.
Potable water is the fittest form of water, suitable for consumption after treatment.
Rain water and river water contains dissolved gases, minerals and particulates from the environment. They are natural form of water.
Therefore option A and B are correct.
Multiple choice evs water: a precious resource importance of water let's play with water water and its properties water resources and conservation

Dissolved gases can be removed from water by:

  1. chlorination

  2. boiling

  3. filtration

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

Dissolved gases can be removed from water by boiling.
Water contains certain gases in dissolved state. The higher the temperature of a solution becomes, the less a gas dissolves provided it doesn't react with the solvent. Consequently, heating/boiling a solution can expel the remaining gas.

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Activated sludge should have the ability to settle quickly so that it can:

  1. be rapidly pumped back from sedimentation tank to aeration tank

  2. absorb pathogenic bacteria present in wastewater while sinking to the bottom of the settling tank

  3. be discarded and anaerobically digested

  4. absorb colloidal organic matter.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The activated sludge have to settle quickly so that it can be pumped back to the aeration tank. So, the correct option is 'be rapidly pumped back from sedimentation tank to aeration tank'

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

In the sewage treatment, bacterial flocs are allowed to sediment in a settling tank. This sediment is called as:

  1. inactivated sludge

  2. activated sludge

  3. primary sludge

  4. secondary sluge
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
In the secondary treatment, the effluent is passed into a settling tank where the bacterial flocs are allowed to sediment and the sediment is called activated sludge.
So, the correct option is 'activated sludge'
Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

The primary treatment of removal of:

  1. dissolved impurities

  2. stable particles

  3. toxic substances

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

The primary treatment involves physical removal of particles from the sewage through filtration and sedimentation. These are removed initially by sequential filtration which removes the floating debris and then grit is removed by sedimentation. 

So, the correct option is 'Option A' .

Multiple choice zoology introduction to microbiology microbial pollution control environmental use of microorganism microbes in waste treatment and biogas

Wastewater treatment generates a large quantity of sludge, which can be treated by:

  1. anaerobic digesters

  2. floc

  3. chemicals

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

Wastewater treatment generates a large quantity of activated sludge during secondary treatment which is used as a inoculum and a small part of it is pumped back to the large aeration tanks whereas the remaining part of that sludge is treated by anaerobic sludge digesters anaerobically. During this digestion, bacteria produces a mixture of gases called biogas. 

So, the correct option is 'Option A' .