in a wastewater treatment plant, activaied siüige tefts\' os\' a. the discharge
ID: 2310784 • Letter: I
Question
in a wastewater treatment plant, activaied siüige tefts' os' a. the discharge of sludge from the sedimentaion tank to the digester b. the supernatant returned from thgdrying auisto the- scruen channel c. activation of the bacteria d. burning of the sludge in the drying beds ater dving For energy recovery e. the return of a part of the sludge from the sadimentation tank to the aeration tank 16 chemicals Oxygen sag curves a. may occur during spring floods. b. occur when oxygen-demandtng wastes are adked to the water c. develop in fasitlowing river d. may oceurupstream from a sewage treatnent flant. e. All of these answers. 17 The chemical(s) that is (are) the predominant cause ok ozone depletion: 18 a. Carbon dioxide b. Chlorofluorocarbons CFOs c. Methane d Nitrous oxide e.Both b andExplanation / Answer
16) e. The return of part of sludge from sedimentation tank to aeration tank
17) b Occures when oxygen-demanding wastes are added to the water.
18) b. Chlorofluorocarbons CFCs
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