Waste incineration plant leachate treatment method and treatment system

Abstract

A waste incineration plant leachate treatment method includes the following steps: S1, waste leachate is introduced into a pre-sedimentation tank for removal of large particulate matters and sedimentin the leachate, and the leachate is introduced into a regulating tank; S2, the leachate is continuously stirred by a submersible agitator arranged at the bottom of the regulating tank, and the leachate is introduced into a UBF pool; S3, the leachate is circulated in the UBF pool, and the leachate overflows from the top of the UBF pool to an intermediate pool; S4, the leachate is precipitated in the intermediate pool, and outlet water overflows to a first denitrification tank; S5, after denitrification reaction, sewage overflows to a first-stage nitrification tank by a stirrer set in the firstdenitrification tank for nitrification in the first-stage nitrification tank, and the sewage overflows to a secondary denitrification tank; S6, after the sewage passes through the secondary denitrification tank and a secondary nitrification tank in turn, the sewage is directly pumped into a membrane treatment system; and S7, the sewage is filtered in the membrane treatment system. The method is particularly suitable for treating sewage of with high concentration of pollutants, especially waste leachate with high COD, high ammonia nitrogen, and high total nitrogen.

Description

technical field [0001] The invention relates to a treatment method and system for leachate of a waste incineration plant, belonging to the technical field of leachate treatment. Background technique [0002] Landfill leachate has a high concentration of pollutants, and if it is not treated effectively, it will cause serious harm to the environment. At present, the combination of physical and chemical treatment, biochemical treatment and land treatment is mainly used in China, and the treatment effect can reach the "Integrated Wastewater Discharge Standard" (GB8978-199S6: first-level standard. [0003] Chinese patent CN 101514062 A discloses a method for treating high-concentration organic sewage such as leachate, resin sewage and printing and dyeing sewage of a waste incineration plant. This method can effectively remove some organic matter and ammonia nitrogen and other pollutants. Its method deficiency is: one, effluent standard is " comprehensive discharge standard of s...

AI Technical Summary

Problems solved by technology

Its method deficiency is: one, effluent standard is " comprehensive discharge standard of sewage " (GB8978-199S6: first grade standard, and the standard is too low, can not meet the " Standards for Pollution Control of Domestic Garbage Landfill Sites (GB16889-2008) Table 3 Standards

2. The concentrated solution produced by the membrane system is directly returned to the regulating tank without any treatment, the system will accumulate a large amount of divalent ions, and the system is difficult to operate stably for a long time

Its method deficiency is: one, effluent standard is " comprehensive discharge standard of sewage " (GB8978-199S6: first grade standard, and the standard is too low, can not meet the " Standards for Pollution Control of Domestic Garbage Landfill Sites (GB16889-2008) Table 3 Standards

2. The ammonia nitrogen index of the treated influent water quality is too low to fully meet the processing capacity of high ammonia nitrogen

3. The setting of the secondary settling tank is superfluous, which cannot satisfy the function of mud-water separation at all.

Images