Technology and device for recovering ammonia from garbage leachate in domestic garbage sanitary landfill site

Abstract

The invention provides a technology and device for recovering ammonia from garbage leachate in a domestic garbage sanitary landfill site. The method comprises the following steps: (1) removal of ammonia in garbage leachate: adding alkaline chemicals into the leachate to regulate the pH value of the garbage leachate to 9-11, and removing ammonia in the garbage leachate in an ammonia removal tower by using an air stripping method; (2) ammonia recovery: recovering ammonia sulfate from gas containing ammonia by using a sulfuric acid solution absorption method, wherein the absorption is realized by two absorption reactors: in the first absorption reactor, 85-95% of gas containing ammonia is processed, and the concentration of ammonia sulfate in the circulating mother liquor in the first absorption reactor is lower than the saturation concentration of ammonia sulfate, thereby preventing ammonia sulfate from crystallizing; and the unsaturated circulating mother liquor in the first absorption reactor is sent into a second absorption reactor to continuously react with 5-15% of gas containing ammonia, so that the concentration of ammonia sulfate in the circulating mother liquor in the second absorption reactor is higher than the saturation concentration of ammonia sulfate, thereby promoting the ammonia sulfate to crystallize; and (3) separating ammonia sulfate crystals.

Description

Recovery process and equipment for ammonia leachate in sanitary landfill of domestic waste technical field The invention relates to a recovery process and equipment for ammonia leachate in domestic waste sanitary landfills, and in particular to the technical field of domestic waste treatment and utilization. Background technique Sanitary landfill is a method of disposing solid waste widely used in my country in recent years. For an anaerobic landfill, its mechanism is to use anaerobic fermentation method to convert organic matter in garbage into gaseous products such as carbon dioxide and methane through the degradation of anaerobic and facultative microorganisms. Since municipal solid waste itself contains a lot of water, it will leach out in the form of leachate during the bioconversion process. At the same time, affected by factors such as rainfall and runoff, landfills will also pass through percolation to form landfill leachate. The composition of landfill leachate...

AI Technical Summary

Problems solved by technology

In particular, it solves the equipment problem of reaction between ammonia-containing gas and sulfuric acid after deamination, overcomes the problems of high cost of ammonium sulfate saturator process equipment, easy blockage of pipelines by ammonium sulfate crystals, frequent equipment maintenance and other problems, high absorption efficiency, and simple operation and management.

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