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.Management Sciences
Category: Chemical Environmental Engineering
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_______________?
A. Chlorination
B. Treating in biological oxygen pond
C. Chemical coagulation
D. None of these
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre) ?
A. Lagooning
B. Activated carbon adsorption
C. Biological oxidation pond
D. Chemical coagulation
______________ is the process of killing organism in water ?
A. Coagulation
B. Sterilisation
C. Disinfection
D. Sedimentation
____________ is removed from water by lime-soda process?
A. Foul smell and taste
B. Iron and manganese
C. Temporary hardness
D. Permanent hardness
The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?
A. Mercury
B. Brine
C. Phosphate
D. None of these
Photochemical smog is formed from automobile exhaust ________________?
A. By reaction of hydrocarbon & nitric oxide in presence of sunlight
B. Appears only on sunny days
C. Is harmful for crops and trees also besides causing eye irritation & asthma
D. All A., B. & C.
A shallow pond in which the sewage is retained and biologically treated is called__________________?
A. Oxidation
B. Imhoff tank
C. Lagoon
D. Skimming tank
Presence of ____________ in water stream are deleterious to aquatic life?
A. Soluble and toxic organics
B. Suspended solids
C. Heavy metals and cyanides
D. All A., B. & C.
H2S present in gaseous stream can be removed by adsorption on _____________________?
A. Silica gel
B. Active carbon
C. Bog iron
D. Limestone powder
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