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Sludge Expansion Knowledge Classroom | Makinggreen Environmental Protection

Time : 2020-04-15

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Sludge Expansion Knowledge Classroom | Makinggreen Environmental Protection

Sludge expansion is a common problem in the environmental protection industry. The following Making Green Environmental Protection has summarized what is sludge expansion for everyone based on the company's years of environmental protection experience.
 
Sludge bulking (sludgebulking) refers to the phenomenon that the sludge structure is extremely loose, the volume increases and floats, and it is difficult to settle and affect the quality of the effluent. Basically, various types of activated sludge processes currently undergo sludge expansion. The sludge expansion is not only high in incidence rate but common in occurrence, but once it is difficult to control, it usually takes a long time to adjust. Generally speaking, when the SVI value of the activated sludge is about 100, its settling performance is better. When the SVI value exceeds 150, it indicates that the activated sludge is about to or is already in the expansion state, and should be immediately paid attention to.


Basic overview of sludge expansion
Sludge bulking (sludgebulking) refers to the phenomenon that the sludge structure is extremely loose, the volume increases and floats, and it is difficult to settle and affect the quality of the effluent. Basically, all types of activated sludge processes will cause sludge expansion, and once it is difficult to control, it usually takes a long time to adjust. The incidence of sludge swelling is quite high. Nearly 50% of urban sewage treatment plants in Europe have varying degrees of sludge swelling each year, and the incidence in China is also very high. There are many theories on sludge expansion, but they are not completely consistent, and there are even many contradictions, which cause great trouble to water treatment workers.


Main characteristics of sludge expansion
The sludge structure is loose, the quality becomes light, and the sedimentation and compression performance is poor; the SV value increases, sometimes reaching 90%, and the SVI reaches more than 300; a large amount of sludge is lost and the effluent is turbid; the secondary sedimentation is difficult to separate solid and liquid, and the return sewage The low mud concentration, sometimes accompanied by the generation of a large amount of foam, can not maintain the normal work of biochemical treatment.


Sludge expansion is one of the more serious anomalies of the biochemical treatment system. It directly affects the quality of the effluent and harms the operation of the entire biochemical system.


The incidence of sludge swelling is quite high. Nearly 50% of urban sewage treatment plants in Europe have varying degrees of sludge swelling each year, and the incidence in China is also very high. Basically, various types of activated sludge processes currently undergo sludge expansion. Sludge swelling not only has a high incidence and is widespread, but once it is difficult to control, it usually takes a long time to adjust for sludge swelling. There are many theories in various aspects, but they are not completely consistent, and there are even many contradictions. Causes great trouble for water treatment workers.


The above is the relevant knowledge about sludge expansion introduced by Making Green Environmental Protection. If you have any environmental protection needs and consultation, please call Making Green Environmental Protection.