Method for treating leachate from waste incineration plants

Abstract

The invention discloses a method for treating leachate from waste incineration plants. The method comprises the following steps: (1) anaerobic treatment: carrying out anaerobic treatment on the leachate from the waste incineration plants by means of an upflow anaerobic sludge blanket (UASB) so as to obtain treated liquid I; (2) softening treatment: adding a softening agent into the treated liquidI, carrying out chemical softening treatment, and then filtering by using a tubular micro-filtration membrane (TMF) so as to obtain treated liquid II; (3) deamination treatment: pumping the treated liquid II into a negative pressure ammonia distillation tower, and introducing steam into the tower for carrying out deamination treatment so as to obtain treated liquid III; (4) membrane advanced treatment: cooling the treated liquid III to 35 DEG C or below, then adjusting the pH value to 6-7, and filtering by means of a disk tubular reverse osmosis (DTRO) membrane so as to obtain produced water.According to the method, the leachate from the waste incineration plants is treated by using a combined process of pretreatment, anaerobic treatment, TMF softening, deamination treatment and membraneadvanced treatment, so that ammonia nitrogen, total nitrogen and organic matters in the leachate can be effectively removed, and the produced water is enabled to meet requirement of up-to-standard discharge or to be recycled.

Description

technical field [0001] The invention relates to the technical field of landfill leachate treatment, in particular to a treatment method for landfill leachate in a waste incineration plant. Background technique [0002] Under the increasingly severe situation of "garbage siege", waste incineration power generation has become the best way to "reduce, harmless, and resourceful" dispose of domestic waste. [0003] Landfill leachate in incineration power plants is mainly produced by precipitation and fermentation during waste dumping. Landfill leachate is a kind of organic wastewater with high concentration of pollutants, complex composition and extremely unstable changes, which will cause serious secondary pollution to the surrounding environment and endanger human health. Landfill leachate contains a large amount of organic matter, nitrogen and phosphorus substances, and a wide variety of heavy metals with excessive content, among which COD Cr 、BOD 5 , heavy metals, ammonia ...

AI Technical Summary

Problems solved by technology

In this process, the biochemical treatment uses nitrification and denitrification to convert ammonia nitrogen into nitrate nitrogen and then into nitrogen gas for removal, which occupies a large area and consumes a lot of energy. In addition, the system has no effect on the removal of calcium, magnesium, silicon, and heavy metals. As a result, after entering the advanced treatment of the membrane, it will reach saturated solubility and precipitate out after being concentrated on the concentrated side of the membrane, causing membrane fouling and affecting the water production rate and service life of the advanced treatment of the membrane.

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