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Method for processing percolate membrane treatment concentrated solution of refuse landfill

A landfill and leachate technology, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the fouling of disc tube filter membranes, affect the service life and Water treatment effect and other issues, to achieve the effect of reasonable process setting, strong practicability, and reduced equipment loss

Active Publication Date: 2014-02-12
浙江博世华环保科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentration by disk tube filtration can effectively remove organic matter and total dissolved solids mainly composed of inorganic salts in the concentrated solution to a certain extent. Scaling of tubular filter membrane or reverse osmosis membrane affects its service life and water treatment effect

Method used

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  • Method for processing percolate membrane treatment concentrated solution of refuse landfill

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The combined process disclosed by the invention is used to treat the leachate membrane treatment concentrate of a landfill site.

[0035] The landfill first uses denitrification and nitrification processes for treatment, and then uses an external membrane bioreactor for mud-water separation. The effluent is treated with nanofiltration membranes, and the effluent of nanofiltration membranes is discharged after being treated with reverse osmosis membranes. After membrane treatment, the concentration of CODcr in the concentrated solution is 1500mg / L, the total hardness content is 1800mg / L, the conductivity is 5600μs / cm, and the pH is 7.2.

[0036] (1) Take 5 tons of membrane treatment concentrate, add industrial grade caustic soda to the membrane treatment concentrate to adjust its pH to 11.5, at this time, the heavy metal ions, calcium and magnesium ions in the concentrate react with caustic soda to generate a large amount of precipitation;

[0037] (2) Filter the above-...

Embodiment 2

[0042] In this example, the combined process disclosed in the present invention is used to treat the leachate membrane treatment concentrate of a landfill, and the landfill adopts the leachate treatment process described in Example 1. After membrane treatment, the concentration of CODcr in the concentrate is 3200mg / L, the total hardness content is 3100mg / L, the conductivity is 8200μs / cm, and the pH is 7.3.

[0043] (1) Take 5 tons of membrane treatment concentrate, add industrial grade caustic soda to the membrane treatment concentrate to adjust its pH to 11.5, at this time, the heavy metal ions, calcium and magnesium ions in the concentrate react with caustic soda to generate a large amount of precipitation;

[0044] (2) Filter the above-mentioned mixed solution containing sediment through a tubular microfiltration membrane. The pore size of the tubular membrane is 0.1 μm, and the operating pressure is 0.4Mpa. After filtration, 4.8 tons of the first permeate and 200L of the r...

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Abstract

The invention discloses a method for processing a percolate membrane treatment concentrated solution of a refuse landfill. The method comprises steps of adding an alkali into the percolate membrane treatment concentrated solution of a refuse landfill, 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 so as 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 the pH to be 6-9, and then concentrating the first permeating liquor through reverse osmosis to obtain a third permeating liquor and a concentrated liquor; discharging the third permeating liquor directly, and drying and solidifying the concentrated liquor. The method is simple, can improve the recovery rate of the percolate membrane treatment concentrated solution, and reduces damage to the reverse osmosis membranes; the quality of the effluent is stable and reaches the standard.

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 landfill. Background technique [0002] At present, sanitary landfill is the main way to deal with urban domestic waste in my country. During the landfill process, various metabolites and water are produced due to anaerobic fermentation, decomposition of organic matter, rainwater flushing, and groundwater immersion, forming landfill leachate. This is a kind of wastewater with large changes in water quality, complex components, high concentration of organic matter, high ammonia nitrogen content, high salt content, and high humus concentration. It is very difficult to treat. [0003] The treatment methods of landfill leachate mainly include recharge method, physical and chemical method, biochemical method and so on. With the improvement of national environmental protection requirements, the leach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F9/10C02F11/12
Inventor 陈昆柏金祥福刘红李艳儿黄卓敏蒋海霞王立江
Owner 浙江博世华环保科技有限公司
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