Method for processing percolate membrane treatment concentrated solution of waste incineration plant

Abstract

The invention discloses a method for processing a percolate membrane treatment concentrated solution of a waste incineration plant. The method comprises steps of adding an alkali into the percolate membrane treatment concentrated solution of the waste incineration plant, and reacting to obtain a mixed liquor containing precipitate; micro-filtering the mixed liquor to obtain a first permeating liquor and a closure liquor; press-filtering for dehydrating the closure liquor through a plate frame to obtain a second permeating liquor and mud cakes, returning the second permeating liquor to the alkali adding step for recycling, and solidifying the mud cakes; adding an acid into the first permeating liquor, regulating pH to be 6-9, and then desalting the first permeating liquor through electrodialysis to obtain electrodialysis fresh water and electrodialysis thick water; carrying out evaporative crystallizing on the electrodialysis thick water, and concentrating the electrodialysis fresh water through reverse osmosis to obtain a third permeating liquor and a concentrated liquor; directly discharging the third permeating liquor, and drying and solidifying the concentrated liquor. The method is simple, has good processing effect, and high recovery rate of the percolate membrane concentrated solution of the waste.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for treating leachate membrane treatment concentrate of garbage incineration plants. Background technique [0002] In recent years, due to the further prominence of environmental problems, municipal solid waste has attracted the attention of various relevant departments and scientific research institutions, and the comprehensive treatment level of municipal solid waste has been significantly improved. The basic policy of waste management, which focuses on waste disposal and aims at recycling, develops steadily. As far as the research status is concerned, the harmless treatment technologies mainly include garbage incineration, composting fermentation treatment and sanitary landfill. [0003] In addition to the control and disposal of flue gas pollution, the waste incineration method also has the problem of landfill leachate. This is a kind of wastew...

AI Technical Summary

Problems solved by technology

The back-spraying method will cause the furnace temperature of the incinerator to be too low, or even flame out; the evaporation method is temporarily difficult to promote due to high energy consumption, expensive equipment and serious equipment loss. In addition, if the concentrated solution is directly evaporated or spray-dried due to the Contains medium salt and organic matter, which will cause compaction of the evaporator and spray dryer, lower heat transfer coefficient, low efficiency, and ultimately lead to inability to handle

Therefore, there is no effective method for treating the leachate membrane treatment concentrate of waste incineration plants so far.

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