E-mail: michael@shboqu.com   |   Expert in Water Quality Measurement and Water Treatment Project

How to solve the sludge problem in sewage treatment?

by:BOQU     2023-03-27
There will be some sludge problems more or less in the operation of sewage treatment. Although these problems will not cause the system to crash, some problems in the sewage can be predicted in advance according to some performances of the sludge, so that they will not be messed up when encountering them. There are large pieces of black sludge floating in the sedimentation tank. There are dead corners in the sedimentation tank, local deposition is anaerobic, CH4 and CO2 are produced, bubbles are attached to the sludge particles and float, and the ammonia nitrogen in the effluent is often high; the reflux ratio is too small, and the sludge reflux is not timely, resulting in anaerobic. Solution: If there are dead corners in the sedimentation tank, the system can maintain high dissolved oxygen, fundamentally solve the structural transformation of dead corners; increase the reflux ratio to prevent the sludge from staying in the sedimentation tank for too long. The flocculent sludge floating on the water surface after sludge sedimentation. Some components in the influent inhibit microorganisms, leading to the elimination of some sludge; the influent contains refractory substances, especially inorganic substances, which lead to a decrease in the activity of the sludge after adsorption, and some sludge floats; local dead ends cause the sludge to float regularly and cause biological Membrane peeling off. The sedimentation ratio is low, but the sludge concentration is high. The high concentration of sludge may be caused by the high concentration of organic matter in the influent, or it may be caused by insufficient sludge discharge. Insufficient sludge discharge will lead to excessive inorganic impurities in the sludge. It seems that the sludge concentration is high, but the actual effective components are not high. , the processing effect is poor. From the perspective of sedimentation ratio, although the sludge concentration is high, the actual sedimentation is relatively low. Disintegration of sludge. When the organic load of the influent is too low, the microorganisms can eat non-nutritive food, which will lead to self-oxidation, thereby reducing the flocculation performance of the bacteria micelles. At this time, if sewage with a high organic load is given, the microorganisms will open their abdomen and try to eat. Without time to digest and metabolize, they form a hydrophilic polysaccharide substance outside the cell. At this time, the sludge is difficult to compress and settle, and disintegrates. Solution: Find out the source of toxic substances, collect and treat them separately, introduce the accidental drainage into the accidental pool in time, control the water inflow, determine and maintain the influent concentration and aeration volume, and avoid overloading or long-term low-load operation.
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