What are the reasons for the slow sedimentation of activated sludge in the aerobic tank of wastewater treatment?
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What are the reasons for the slow sedimentation of activated sludge in the aerobic tank of wastewater treatment?
The oxygen tank requires aeration; as for the sedimentation of sludge, what’s the point of doing that in the aerobic tank? It can be done in the secondary sedimentation tank.
He must be referring to SV30, as it was found to settle slowly during the experiments.
There are several reasons for slow settlement in general: 1. Low sludge concentration； 2. High organic load ； 3. Sludge bulking ； 4. Transitional aeration.
1. Excessive aeration may prevent fine sludge from forming flocs. 2. The low COD load causes partial flocculation breakdown of the sludge; some nutritional agents can be added. 3. The sludge has high activity and a short age, which allows for an increase in the recirculation rate. 4. The ratio of organic pollutants to active microbial biomass is high; due to an abundance of food (organic pollutants), the microorganisms in the activated sludge grow rapidly, and organic pollutants are removed at a fast pace as well, resulting in poor settling properties of the activated sludge.
The analyses from Haiyou on the fourth and fifth floors are all reasonable! As a process operator, it is very necessary to accumulate and analyze raw data; as for the specific reasons, microscopic examination can also be conducted.
What was said about the fourth and fifth floors is correct; actually, these are the only possible situations