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Method for treating garbage leachate

A technology of landfill leachate and treatment method, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problem of unsatisfactory removal effect, poor biodegradability of leachate, and system operation problems such as defects, to shorten the water intake time, reduce the pollution load and toxicity, and prevent sludge expansion.

Inactive Publication Date: 2009-11-18
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early stage of landfill use, the biodegradability of the leachate is good, which is more suitable for biochemical treatment. However, in the later stage of landfill, the biodegradability of the leachate is poor, and the system will run poorly.
[0007] 3. Most of the landfill leachate pretreatment technologies are effective for COD cr The removal effect is remarkable, for NH 3 -N removal effect is not satisfactory, while high concentration NH 3 -N, will lead to activated sludge poisoning, so ammonia must be blown off before entering the biological treatment, resulting in too long process, complicated management and high operating costs

Method used

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  • Method for treating garbage leachate
  • Method for treating garbage leachate

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Get some landfill leachate somewhere. Water quality: taupe, with foul smell, COD Cr The concentration is 3000mg / L, the pH is 7.5, the ammonia nitrogen is 1325mg / L, the turbidity is 614NTU, and the SS is 727.2mg / L.

[0028] The landfill leachate treatment method is as follows:

[0029] 1) Pretreatment: take landfill leachate, and then add 0.01mol / LFe to it 2 SO 4 ·7H 2 O, 9g / L activated carbon and 6ml / L H 2 o 2 , at a microwave frequency of 2450Hz and a microwave power of 300W, react for 5 minutes;

[0030] 2) SBR follow-up treatment: SBR follow-up treatment is completed in the same reaction tank, which is installed in a water bath, and the temperature of the water bath is controlled at 24-26°C; the amount of pretreated landfill leachate is controlled by a flow meter, and each cycle The input volume is 1L, enter the reaction tank within 0.4h; aerate for 7h, the aeration rate is 13.5L / h, the pH is controlled to 6.5, and the sludge concentration is 3000mg / L; Discha...

Embodiment 2

[0033] Take landfill leachate that has been piled up somewhere for more than 5 years. Water quality: brown with foul smell, COD Cr The concentration is 4000mg / L, the pH is 7.8, the ammonia nitrogen is 1764.8mg / L, the turbidity is 819.2mg / L, and the SS is 969.6mg / L.

[0034] 1) Pretreatment: take landfill leachate, and then add 0.02mol / LFe to it 2 SO 4 ·7H 2 O, 10g / L activated carbon and 7ml / L H 2 o 2 , at a microwave frequency of 2450Hz and a microwave power of 300W, react for 6 minutes;

[0035] 2) SBR follow-up treatment: SBR follow-up treatment is completed in the same reaction tank, which is installed in a water bath, and the temperature of the water bath is controlled at 24-26°C; the amount of pretreated landfill leachate is controlled by a flow meter, and each cycle The input volume is 1L, enter the reaction tank within 0.5h; aerate for 8h, the aeration rate is 13.5L / h, the pH is controlled to be 7, and the sludge concentration is 3500mg / L; Discharge within 0.5h; ...

Embodiment 3

[0038] Get leachate somewhere. Water quality: dark brown with foul smell, COD Cr The concentration is 5000mg / L, the pH is 8.0, the ammonia nitrogen is 2260mg / L, the turbidity is 1024NTU, and the SS is 1212mg / L.

[0039]1) Pretreatment: take landfill leachate, and then add 0.03mol / LFe to it 2 SO 4 ·7H 2 O, 11g / L activated carbon and 8ml / L H 2 o 2 , under microwave frequency 2450Hz, microwave power 300W, react for 7min;

[0040] 2) SBR follow-up treatment: SBR follow-up treatment is completed in the same reaction tank. The reaction tank is installed in a water bath, and the temperature of the water bath is controlled at 24-26°C; The input volume is 1L, enter the reaction tank within 0.6h; aerate for 9h, the aeration rate is 13.5L / h, the pH is controlled to be 7.5, and the sludge concentration is 4000mg / L; h; after the reaction pool is idle for 0.6h, the subsequent SBR treatment of the landfill leachate in the next cycle will be carried out.

[0041] The water quality of ...

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Abstract

The invention relates to a method for treating garbage leachate. The invention adopts the technical proposal that the method comprises the following steps: adjusting the pH value of the garbage leachate to between 7 and 9, adding 0.01 to 0.03 mol / L of Fe2SO4.7H2O, 9 to 11 g / L of active carbon and 6 to 8 ml / L H2O2 into a reaction system, and making the mixture react for 5 to 7 minutes at the microwave frequency of 2,450Hz and the microwave power of 300W; delivering the mixture into a reaction tank within 0.4 to 0.6 hour; aerating the mixture for 7 to 9 hours at the aeration rate of 13.5 L / h, and controlling the pH to between 6.5 and 7.5 and the sludge concentration to between 3,000 and 4,000 mg / L; standing the mixture for 2 to 3 hours, and layering the mixture; discharging the liquid at the upper layer within 0.4 to 0.6 hour; and after the reaction tank stood for 0.4 to 0.6 hour, and carrying out SBR post treatment of the garbage leachate of the next period. The method has short pretreatment time, improves the biodegradability obviously, has good pollutant removal effect, and improves the yielding water quality remarkably.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a treatment method for landfill leachate. Background technique [0002] Landfill leachate is a yellow-brown, foul-smelling, highly polluting liquid containing various organic and inorganic pollutants that seeps out during the process of dumping garbage. It is one of the main factors that produce secondary pollution during the landfill process. The water quality and quantity of landfill leachate vary greatly, the composition is complex, the concentration of pollutants is high, and the hazard lasts for a long time. [0003] The characteristics of landfill leachate determine that it is difficult to obtain satisfactory results by using any one method alone, so it is often necessary to combine various methods to meet the treatment requirements. In addition, for a developing country like my country, it is very urgent to find an economical and reasonable leachate treatment method to achieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/72C02F3/30
Inventor 马溪平王杰徐成斌付保荣程志辉李法云孟雪莲
Owner LIAONING UNIVERSITY
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