Method for fully recycling sludge

Abstract

The invention relates to sewage treatment and solid waste treatment in the environmental engineering field and aims at recycling the excess sludge in a sewage treatment plant. A hydrolyzed solution, which is obtained after the sludge is hydrolyzed, can be used as a flocculating agent which directly flows back for sewage treatment; a calcium chloride solution can be added into the hydrolyzed solution, so that supernatant liquor which contains the biological flocculating agent and bottom sediments which mainly comprise inorganic matters and a small amount of unhydrolyzed organic matters are separated; a crude flocculation solution is obtained by centrifuging the supernatant liquor which contains the flocculating agent; and a flocculating agent crude product can be obtained after the crude flocculation solution reacts with acetone and a reaction product is centrifuged. After being treated, the bottom sediments which mainly comprise the inorganic matters and a small amount of unhydrolyzedorganic matters can be used as a chemical fertilizer. In the invention, after being treated, the sludge is recycled, the purpose of zero sludge discharge is achieved finally, the sludge treatment problem of the sewage treatment plant is thoroughly solved, the cost of water treatment is lowered and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of sludge treatment in sewage treatment plants, and is a method for completely recycling sludge, which aims at resource utilization of excess sludge to prepare products and prevents sewage treatment plants from discharging excess sludge to the outside. Background technique [0002] With the development of my country's economy, the municipal sewage treatment capacity has been continuously enhanced, the sewage treatment rate has continued to increase, and the environmental pollution problems caused by municipal sewage have been gradually resolved. However, there has always been a tendency to treat heavy wastewater and light sludge. Many cities have not considered sludge treatment as a necessary part of the sewage plant. It is often a long time before the sludge treatment system is built after the sewage treatment plant is completed. , or the sludge treatment system has not been well run, resulting in a very low...

AI Technical Summary

Problems solved by technology

[0006] Based on the defects of the above-mentioned sludge treatment and disposal technology and the actual needs of sludge treatment and disposal, in order to solve the problem of excess sludge discharge in existing sewage treatment plants, an economical, stable and environmentally friendly sludge recycling technology is provided to realize sewage The resource utilization of excess sludge in the treatment plant, the present invention creates a new type of sludge multi-level resource utilization technology

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