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单选题 Activated sludge is a step
学科：2023-2024-1专业英语
时间：2023-09-16 10:54:39
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题目1单选题
DO meansA. defensive organizationB. dissolved oxygenC. depleted organismD. domestic oxidization
题目2单选题
Microorganisms are separated from the liquid in( )A. a primary clarifierB. an aeration tankC. a final clarifierD. a digesting tank
题目3单选题
()are activated when screens get sufficiently clogged to raise the water level in front of the barsA. The steel barsB. The cleaning rakesC. The flow meterD. all of the above
题目4单选题
As with coagulants,these aids should preferably be()A. nocuousB. innocuousC. feasibleD. favorably
题目5单选题
What are the Key factors in the successful operation of DAF unitsA. The maintenance of proper pHB. The continuous presence of trained operatorsC. Proper flow ratesD. all of the above
题目6单选题
Activated sludge is a stepA. biologicalB. chemicalC. physicalD. medical
题目7单选题
If the tank volume is 120 m³ and the flow rate is 2 m³/min,how long is the retention timeA. 30 minB. 40 minC. 50 minD. 60 min
题目8单选题
Discharges into a sanitary sewerage system consist of ( )A. domestic wastewaterB. infiltrationC. industrial dischargeD. all of the above
题目9单选题
Primary treatment is( )that remove nonhomogenizable solids and homogenize the remaining effluentA. physical processB. chemical processC. biological processD. all of the above
题目10单选题
Flotation is an operation that removes not only oil and grease but also( )A. suspended solidsB. grease particleC. proteinD. phosphorus
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