Method for treating excess sludge of sewage plant

Abstract

The invention discloses a method for treating excess sludge of a sewage plant. The method is characterized by including the steps of firstly, mixing the excess sludge of the sewage plant with sludge of a water supply plant according to the volume ratio of 1:(0.1-0.3), and stirring, wherein the water content of the sludge of the water supply plant is 68-73%, and the sludge of the water supply plate is generated by the coagulating sedimentation and filtering sterilizing treatment process, using polyaluminum chloride as the coagulant, of the water supply plant; secondly, dewatering the stirred mixed sludge, to be more specific, placing the stirred mixed sludge in a centrifugal machine, and performing centrifugal dewatering at the rotation speed of 2600-3800r / minute for 10-30 minutes. The method has the advantages that the problems that the sludge water amount of the city water supply plant is large and the sludge water is difficult to treat are solved, the sludge water is reused to treat the excess sludge of the sewage plant, the sludge water treatment problem of the water supply plant is solved, the economic cost of the water supply plant is reduced, the use amount of sewage plant coagulant and conditioning agents before access sludge dewatering is reduced, and the treatment cost of the sewage plant is lowered.

Description

technical field [0001] The invention relates to a process for treating sewage, in particular to a process for treating excess sludge in a sewage plant. Background technique [0002] At this stage, with the improvement of my country's environmental quality standards, the improvement and deepening of the treatment rate and treatment degree of sewage plants in various regions have brought about a huge increase in sludge production. At present, the biggest disadvantage of the activated sludge method used by most water plants is that a large amount of residual sludge is produced while treating sewage (15-100L activated sludge is produced for every kilogram of organic matter removed), and the moisture content of these sludges reaches more than 95%. , resulting in high processing costs for excess sludge (accounting for about 25%-65% of sewage plant operating costs). [0003] The residual sludge filtrate of urban sewage plants has a high phosphorus content, which will increase the ...

AI Technical Summary

Problems solved by technology

At present, most of the water supply plants in my country discharge the sludge water into the nearby water body, causing secondary pollution to the surrounding water body.

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