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Membrane treatment method of landfill leachate concentrate

A technology for landfill leachate and concentrated liquid, which is applied in the fields of dehydration/drying/concentrated sludge treatment, chemical instruments and methods, and multi-stage water/sewage treatment. and other problems, to achieve the effect of low processing cost, low equipment investment and low processing cost

Inactive Publication Date: 2014-08-06
TIANJIN HIPURE MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using membrane bioreactor + nanofiltration and reverse osmosis technology to treat landfill leachate can ensure that the produced water meets the discharge standard, but this treatment process will produce a large part of the concentrate, which cannot meet the discharge standard and needs further treatment
This kind of concentrated solution is high in salt, toxic, heavy metal ions and biodegradable substances, and it is difficult to handle. It is usually treated by incineration, evaporation, etc., which requires large investment, high cost, high energy consumption, and may cause secondary pollution.

Method used

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  • Membrane treatment method of landfill leachate concentrate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 Shown, the membrane treatment method of the landfill leachate concentrate of this implementation, its steps are as follows:

[0031] 1) Add 0.5g / L lime to the landfill leachate concentrate, stir and mix for 5 minutes, then add 0.2g / L sodium carbonate, mix and stir for 5 minutes, and settle for 1 hour;

[0032] 2) Filter the precipitated supernatant with a tubular membrane ultrafiltration membrane to remove impurities such as suspended solids and colloids in the concentrated solution, and obtain a turbidity of 0.3 NTU in the filtrate;

[0033] 3) adding hydrochloric acid to the tubular membrane permeate to adjust the pH value to 7;

[0034] 4) Use the reverse osmosis membrane to treat the concentrated solution after adjusting the PH value. The permeated solution COD is 45mg / L, total nitrogen is 15mg / L, and the chromaticity is 1, reaching the discharge standard, and the water recovery rate is 50%;

[0035] 5) Use a plate and frame filter press to dehydr...

Embodiment 2

[0037] Such as figure 1 Shown, the membrane treatment method of the landfill leachate concentrate of this implementation, its steps are as follows:

[0038] 1) Add 2g / L lime to the landfill leachate concentrate, stir and mix for 15 minutes, then add 0.5g / L sodium carbonate, mix and stir for 15 minutes, and settle for 2 hours;

[0039] 2) Filter the precipitated supernatant with a tubular membrane microfiltration membrane to remove impurities such as suspended solids and colloids in the concentrated solution, and obtain a turbidity of 0.5 NTU in the filtrate;

[0040] 3) Add hydrochloric acid to the tubular membrane permeate to adjust the pH value to 6.5;

[0041] 4) Using nanofiltration membrane to treat the concentrated solution after adjusting the pH value, the permeated solution COD85mg / L, total nitrogen 25mg / L, chromaticity 1, reached the discharge standard, and the water recovery rate was 65%;

[0042] 5) Use a belt filter press to dehydrate the sediment to form a mud c...

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Abstract

The invention discloses a membrane treatment method of a landfill leachate concentrate. The method comprises the steps of adding lime and sodium carbonate into the landfill leachate concentrate, removing calcium, magnesium and heavy metal ions in the concentrate, performing tubular membrane filtration, then performing nano-filtration and reverse osmosis treatment, and discharging permeated liquid under standards so as to realize reduction of the landfill leachate concentrate. The membrane treatment method can be used for realizing the reduction of the landfill leachate concentrate, reducing the investment and treatment cost, and removing most pollutants in the concentrate at the same time.

Description

technical field [0001] The present invention relates to a method for treating landfill leachate concentrate, in particular to a membrane treatment method for landfill leachate concentrate. Background technique [0002] A large amount of leachate will be produced during the transportation, stacking, and landfill of domestic waste. Landfill leachate has high pollutant concentration, complex composition, high toxicity, and is difficult to handle. The pollutants contained in one ton of leachate are equivalent to 100 tons of urban sewage. The concentration must be treated up to the standard before it can be discharged. In order to control pollution and protect the environment, the country has formulated the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008), which stipulates strict discharge standards for landfill leachate, and puts forward higher requirements for landfill leachate treatment. Using membrane bioreactor + nanofiltration and reverse osmo...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F9/10C02F11/12
CPCY02A20/131
Inventor 吴姗姗
Owner TIANJIN HIPURE MEMBRANE TECH CO LTD
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