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Chemical Engineering - Environmental Engineering

Exercise : Environmental Engineering - Section 1
31.
The main pollutant in waste water discharged from a petroleum refinery is oil (both in free and emulsified form). Free oil is removed by
biological oxygen pond.
aerated lagoons.
trickling filters.
gravity separator having oil skimming devices.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Phenolic water generated in coke ovens & by-product plant attached to an integrated steel plant containing phenol in concentration of less than 100 mg/litre can be removed by
chlorination
treating in biological oxygen pond
chemical coagulation
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?
Dust catcher (gravity type)
Cyclone separator
Bag filter
Hollow wet scrubber
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is
inversely proportional to viscosity of gas.
proportional to the viscosity & density of the gas.
proportional to the pressure of the gas.
both (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Dust collection efficiency of a cyclone separator depends upon its
diameter.
inlet gas velocity.
overall height.
all (a), (b) & (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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