High-concentration anaerobic sludge digestion treatment process for carrying out mechanical dewatering on sludge

Abstract

The invention relates to a high-concentration anaerobic sludge digestion treatment process for carrying out mechanical dewatering on sludge, comprising the following steps of: conveying sludge with high water content into a concentration tank, wherein the water content of the concentrated sludge is reduced to 97 percent, and a supernate reflexes to a sludge treatment system; carrying out mechanical pre-dewatering on the concentrated sludge, wherein the water content is about 88-90 percent after the mechanical pre-dewatering; then carrying out anaerobic digestion on the pre-dewatered sludge under the high concentration condition by adopting a CSTR (Continuous Stirred-Tank Reactor); and further dewatering the sludge after anaerobic digestion, wherein the water content of a treated sludge cake is about 75 percent. The invention has following advantages and positive effects: by adopting the technical scheme, the dewatering effect of the sludge is favorable, the volume of an anaerobic sludge digestion tank is greatly shortened, and the capital construction investment and the operation cost of a sewage treatment plant are reduced; the load of organic matters in the sludge can be effectively improved by carrying out pre-dewatering on the sludge; and the CSTR anaerobic sludge digestion which is suitable for the high-concentration solid materials is used for treatment, which is beneficial to sludge resource utilization.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and relates to a sludge dehydration process in which a pre-dehydration unit is added before a sludge digestion unit. Background technique [0002] In recent years, people's requirements for environmental quality have become higher and higher, and the control of environmental pollution in various countries has also been strengthened. The biochemical treatment technology of municipal sewage and other organic sewage has been widely recognized and promoted. However, these sewage treatment processes will A large amount of residual activated sludge is produced. The treatment and disposal of these remaining activated sludges all involve the concentration and dehydration of sludge. [0003] In the traditional sludge dewatering process, the sludge is generally concentrated first, and then mechanically dewatered after the sludge is digested. There are problems such as the large size of the sludge...

AI Technical Summary

Problems solved by technology

There are problems such as large volume of sludge anaerobic digestion tank, high infrastructure investment and operating costs, poor sludge dehydration effect, high moisture content of treated sludge, which is not conducive to subsequent disposal of sludge, etc.

And usually the heat generated in winter cannot meet the insulation needs of the anaerobic digester itself

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