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多选题 The slow sand filtration usually has two working stages, including ( )
学科：水质工程学
时间：2023-05-10 01:39:07
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题目1多选题
The removal mechanisms of suspended particles in the filter include ( )A. Mechanism of screeningB. Mechanisms of adsorption and contact flocculationC. Mechanism of migrationD. Mechanism of stripping
题目2多选题
Requirements for filter media include ( )A. Mechanical strengthB. Chemical stabilityC. Gradation and porosityD. Obtaining of the filter material should be as convenient as possible
题目3判断题
Slow sand filter needs backwash after running for a long time. ( )A. 对B. 错
题目4判断题
The applied transverse surface cleaning in V-shaped filter may increase the amount of backwashing water. ( )A. 对B. 错
题目5判断题
Chemical cleaning is usually based on the degree of membrane fouling, using oxidant (sodium hypochlorite, etc.), acid (hydrochloric acid, sulfuric acid, nitric acid, etc.), alkali (sodium hydroxide, etc.), complexing agent, surfactant, enzyme, detergent and other chemical cleaning agents to soak and clean the membrane. ( )A. 对B. 错
题目6多选题
Valveless filter has many advantages include ( )A. it does not need large valvesB. backwash is completely automaticC. negative water head will not appear in the filtration processD. the structure of the filter is simple, loading and unloading of the filter media are very convenient
题目7多选题
The slow sand filtration usually has two working stages, including ( )A. mature period of the filter layerB. the aging periodC. the filtration periodD. the backwash period
题目8判断题
Air floatation process can be applied to desalination. ( )A. 对B. 错
题目9判断题
The actual residence time is shorter than theoretical value because of the density current in the actual sedimentation tank. ( )A. 对B. 错
题目10单选题
The salt content in seawater is mainly: ( )A. MgCl2B. CaSO4C. NaClD. NaBr
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