Write one word for each of the following.

1. Dirty water ....................

2. Impurities in wastewater ....................

3. The chemical process of waste water treatment plant ....................

4. Wastewater that contains suspended impurities ....................

5. The material that settles at the bottom of sedimentation tanks ....................

6. Material that rises to the top in sedimentation tanks ....................

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Solution

Waste water

Contaminants

Tertiary treatment

Sewage

Sludge

Scum

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Similar questions

Q. Which one of these is a mechanical process of treating wastewater?

(a) Screening of wastes
(b) Digestion of wastes
(c) Disinfecting water
(d) Sedimentation tanks

Q. Read the following statements (A-D) related to the composition of domestic wastewater and select the correct option stating true (T) and false (F).

A. Wastewater contains 0.3 % of impurities.
B. Suspended solids in wastewater include sand, silt and clay.
C. Colloidal materials like fecal matter, bacteria, cloth and paper fibres are present in wastewater.
D. Dissolved materials in waste water include nutrients like starch, nitrates and ammonia.

Q. Which one of these refers to the material that settles at the bottom in wastewater treatment?

(a) Sludge
(b) Scum
(c) Sewage
(d) None of these

In one of the stages of wastewater treatment, the solid impurities are allowed to settle down at the bottom. This particular stage in the entire purification is called ___

Q. From which one of these does sewage pass through to remove larger impurities?

(a) Vertical bars
(b) Grit chamber
(c) Aeration tanks
(d) Sedimentation tanks

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1.	Dirty water	....................
2.	Impurities in wastewater	....................
3.	The chemical process of waste water treatment plant	....................
4.	Wastewater that contains suspended impurities	....................
5.	The material that settles at the bottom of sedimentation tanks	....................
6.	Material that rises to the top in sedimentation tanks	....................

Waste water Contaminants Tertiary treatment Sewage Sludge Scum

Waste water

Contaminants

Tertiary treatment

Sewage

Sludge

Scum