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

A waste incineration and leachate technology, applied in separation methods, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problem of hardening of evaporators and spray dryers, no effective treatment of concentrates, serious equipment losses, etc. problems, to achieve the effect of reducing the amount of concentrated water, setting the process reasonably, and reducing the loss of equipment

Active Publication Date: 2015-03-25
浙江博世华环保科技有限公司 +1
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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.

Method used

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

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Embodiment 1

[0033] The combined process disclosed by the invention is used to treat the leachate membrane treatment concentrate of a waste incineration plant.

[0034] The CODcr concentration of the concentrated liquid after membrane treatment in the incineration plant is 3000mg / L, the total hardness content is 8000mg / L, the conductivity is 15600μs / cm, and the pH is 7.2.

[0035] (1) Take 5 tons of membrane treatment concentrate, add industrial grade caustic soda to the membrane treatment concentrate to adjust the pH to 11.5, at this time, the heavy metal ions, calcium and magnesium ions in the membrane treatment concentrate react with caustic soda to form a large amount of precipitation;

[0036] (2) Filter the above-mentioned mixed solution containing sediment through a tubular microfiltration membrane. The pore size of the microfiltration membrane is 0.1 μm, and the operating pressure is 0.35 MPa. After filtration, 4.5 tons of the first permeate and 500 L of the retained solution conta...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/469C02F1/66C02F1/44C02F9/10
Inventor 陈昆柏王立江沈斌余天云廖晓峰黄卓敏李玉云施勇琪陶丽霞姚黄丽
Owner 浙江博世华环保科技有限公司
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