Hamad Chemical Environmental Engineering 22/09/2021 A. HF B. SO2 C. H2S D. Both B. & C. Related Mcqs: Disinfection of water is done to remove ______________________?A. Color B. Bad taste C. Foul odour D. Bacteria... The function of skimming tank in sewage treatment is to remove _____________ substances?A. Dissolved solid B. Suspended solid C. Oil & fatty D. Gritty & inorganic... Beyond what concentration of H2S in air, acute danger to human life exists ?A. 50 ppm B. 100 ppm C. 300 ppm D. 700 ppm... TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?A. 5 B. 100 C. 1000 D. 2000... Replenishment of dissolved oxygen in water stream polluted with industrial waste occurs by________________?A. Natural aeration of water stream B. Photosynthetic action of algae C. Both A. & B. D. Neither A. nor B....
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