Daily Water Treatment Question (11.29)

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1. During the shutdown of the biochemical tank in the activated sludge process, the incorrect practice is ( ). A. After stopping the water supply, cease adding the pH regulator. B. After stopping the water supply to the biological treatment tank, continue aeration and keep adding phosphates as usual. C. Gradually reduce the number of operating cycles of the biological treatment tank based on the water volume. D. Gradually reduce the amount of water supplied. 2. During the shutdown process of the biological treatment tank in the activated sludge process, which sequence of operations is incorrect? ( ) A. Stop the water supply first, then stop aeration. B. Stop the phosphate preparation system first, then the point where phosphates are added. C. Adjust the oxygen supply level first, then reduce the water inflow volume. D. Stop the water supply first, then stop recirculation. B;C