Wastewater commissioning guides-Part 3
5, AB method how to control the A section? Is it possible to give continuous return to section A from a sinker with equivalent flow? How much should SV30 control? Is it 5%-10%?
A: The reflux ratio in section A should be larger, but it should not make the residence time of the sludge in the sedimentation tank too short. Although the A section is mainly based on adsorption, it also has certain biodegradation effects, and the biodegradation is mostly precipitated. In the tank, the adsorption capacity can only be restored if the organic matter adsorbed on the surface of the sludge is degraded. The MLSS should be used to control, and SV30 can also be used when the sludge settling performance is stable. According to the actual situation, the settlement ratio is 5%-10% too low.
6. If a wastewater treatment plant does not achieve a good result after one or two years of operation, should it consider recultivating bacteria? What is the difference between changing mud and starting bacteria?
A: No change! If the operating conditions are the same, the change will be the same, even if you do not use the dominant bacteria dosing, can only be maintained for a period of time, it is important to control the operating conditions, if the problem is the design of timely rectification.
7. I am debugging industrial wastewater. The process is hydrolysis + anaerobic + aerobic tank 1 + aerobic tank 2+ precipitation. Due to installation problems, the aeration tank gas distribution is uneven (round aeration head aeration). At each aerator, there is a similar tumbling fountain (diameter of about 1m), uneven aeration, and the treatment effect is How much influence? It was also found that the aeration zone had less filler filming and there were large metazoan microscopically. No other organisms were found. The surface of the filler biofilm was light yellow. The biofilm thickness outside the aeration area was 3cm. Can you give me an explanation? ?
A: The situation you mentioned cannot be said to be uneven and it is normal. And what do you say is that there are not many biofilms? If the biofilm basically covers the filler, it is very good. As for the biofilm thickness of 3cm outside the aeration zone, it is a serious problem. Take measures such as atmospheric flushing and anaerobic stripping.
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