Question: Secondary treatment uses __________ to consume wastes. [A]. micro-organisms [B]. chemicals [C]. filtration [D]. none of these Answer: Option A Explanation: No answer description available for this question.

Question: Which of the following chemical is sometime added in the process of coagulation and flocculation? [A]. Aluminum sulphate [B]. Aluminum oxide [C]. Calcium chloride [D]. None of these Answer: Option A Explanation: No answer description available for this question.

Question: Sedimentation is a physical process used in wastewater treatment to [A]. remove particles that are less dense than water [B]. remove particles that are more dense than water [C]. remove the pertinacious material from the water [D]. none of…

Question: The common methods used for disinfection in waste water treatment plants are [A]. chlorination [B]. UV light [C]. both (a) and (b) [D]. Phenolic solvent Answer: Option C Explanation: No answer description available for this question.

Question: The chemical oxygen demand (COD)measures the [A]. amount of oxygen required for growth of microorganisms in water [B]. amount of oxygen that would be removed from the water in order to oxidize pollution [C]. amount of oxygen required to…

Question: The water being used in dairy industry should contain not more than [A]. 5 proteolytic and/or lipolytic organisms per ml [B]. 10 proteolytic and/or lipolytic organisms per ml [C]. 15 proteolytic and/or lipolytic organisms per ml [D]. 20 proteolytic…

Question: Coliform bacteria in water is an indication of the presence of [A]. radioactive wastes [B]. excess fertilizer [C]. decaying animals and plants [D]. human feces Answer: Option D Explanation: No answer description available for this question.

Question: Lagoons may be characterized as [A]. anaerobic [B]. facultative [C]. aerated [D]. all of these Answer: Option D Explanation: No answer description available for this question.

Question: The activated sludge process is sometime referred as [A]. fluid bed biological oxidation system [B]. fixed bed biological oxidation system [C]. turning bed biological oxidation system [D]. none of the above Answer: Option A Explanation: No answer description available…

Question: The activated sludge process consists of returning a portion of the clarifier [A]. effluent water entering the reactor [B]. influent water coming out of the reactor [C]. influent water entering the reactor [D]. effluent water coming out of the…