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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 2
11.
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
biological oxidation.
skimming off.
settling out using chemical reagents.
chlorination.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
decreases.
increases.
remains constant.
may increase or decrease ; depends on the chemical characteristics of polluted water.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called
grit
dust
powder
smoke
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Which of the following is the most severe air pollutant ?
hydrocarbons
NOx
SO2
CO
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Presence of bacteria in potable (drinking) water causes
turbidity
disease
bad odour
bad taste & colour
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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