Method for inhibiting activated sludge bulking of SBR pool

Abstract

The invention relates to a method for inhibiting the activated sludge bulking of an SBR pool, and belongs to the field of sewage treatment. A platform is constructed beside the SBR pool, and a self-sucking pump (2) is placed on the platform; a pipeline (3) positioned on one head of the self-sucking pump (2) extends into the SBR pool (1), and the other head of the self-sucking pump (2) is connected with a venturi ejector (4); and an air duct (6) is connected to a venturi pipe (5) of the venturi ejector (4), the air duct (6) is directly connected with an ozone generator (7), and the outlet of the venturi ejector (4) is connected with a spray nozzle (9). According to the method, the ozone generator (7) is started, the self-sucking pump (2) is started at the same time, active sludge and sewage which are positioned in SBR simultaneously enter the venturi ejector (4) to be mixed with ozone and are sprayed from the spray nozzle (9) through a pipeline (8) under the action of the self-sucking pump; the sludge volume index range of raw wastewater is 500-710, the sludge settling ratio range of the raw wastewater is 50%-65%, after the raw wastewater is treated by a device, the sludge volume index range is detected to be 55-75, and the sludge settling ratio range is detected to be 12%-18%.

Description

technical field [0001] The invention relates to a method for inhibiting the expansion of activated sludge in an SBR pool, belonging to the field of sewage treatment. Background technique [0002] Sludge bulking is one of the more serious abnormal phenomena in the biochemical treatment system, which directly affects the quality of the effluent and endangers the operation of the entire biochemical system. The occurrence rate of sludge bulking is quite high. Nearly 50% of urban sewage plants in Europe have sludge bulking to varying degrees every year, and the incidence rate in China is also very high. Basically, sludge bulking will occur in all types of activated sludge processes at present. Sludge bulking not only has a high occurrence rate but is common, and once it occurs, it is difficult to control and usually takes a long time to adjust. For sludge bulking, there are many theories in various aspects, but they are not completely consistent, and there are even many contrad...

AI Technical Summary

Problems solved by technology

[0003] At present, there are two types of methods to inhibit the expansion of activated sludge in SBR pools: one is emergency measures, adding coagulants such as iron salts and aluminum salts can directly improve the compaction of sludge to ensure sedimentation water; The sludge bulking phenomenon can also be eliminated in the return sludge, but the emergency measures cannot fundamentally control the reproduction of filamentous bacteria. Once the dosing is stopped, the sludge bulking phenomenon will come back again, and the dosing may destroy the ecological system. Microbial growth environment, resulting in reduced treatment efficiency

The other is to improve the biochemical environment and adopt a high-load activated sludge process. Although the removal rate of organic acids is high and it helps the production of flocculent bacteria, the cost is high and it will cause inconvenience to future maintenance and management.

Therefore, neither of these two methods can effectively inhibit the expansion of activated sludge in SBR pools.

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