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Method for pretreating landfill leachate by quasi aerobiotic landfilling body

A landfill leachate, quasi-aerobic technology, applied in the direction of aerobic and anaerobic process treatment, can solve the problems of large difference in denitrification effect, impact and high investment cost

Inactive Publication Date: 2015-12-09
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional biological nitrogen removal technology has the following problems: 1) It is difficult for autotrophic nitrifying bacteria to compete with heterotrophic bacteria and become the dominant bacteria in the activated sludge system; 2) Nitrifying bacteria are easily affected by the environment; 3) Nitrifying- The denitrification process is difficult to unify in time and space, and the denitrification effect varies greatly
However, the control conditions of these denitrification processes are strict, the system is greatly affected by external shocks, and the practical operability is not strong.
In addition, the above methods all require independent processing facilities, and the investment cost is relatively high, resulting in relatively few practical applications.

Method used

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  • Method for pretreating landfill leachate by quasi aerobiotic landfilling body
  • Method for pretreating landfill leachate by quasi aerobiotic landfilling body
  • Method for pretreating landfill leachate by quasi aerobiotic landfilling body

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Embodiment 1

[0068] The municipal solid waste landfill test was carried out in an indoor simulated landfill device from April 2006 to June 2007. The simulated landfill device was made of PVC material and fixed with a steel frame structure. In the landfill test, two treatments were set up, quasi-aerobic landfill and anaerobic landfill, and the size of the landfill structure was 1.0m×1.5m×1.8m. The waste for testing comes from municipal solid waste in Beijing Asuwei landfill, and its moisture, organic matter and ash contents are 52.9%, 48.3% and 51.7% respectively. The amount of garbage used in the landfill test is about 1600kg, and the compacted density of the landfill garbage is about 0.73t m -3 , the porosity is about 27.0%.

[0069] HDPE membranes are laid on the bottom of the quasi-aerobic landfill structure, and a leachate drainage layer (gravel, 50cm in thickness) is laid on the membrane, and a leachate drainage pipe (5cm in diameter) is laid in between. A vertical perforated air du...

Embodiment 2

[0073] The municipal solid waste landfill test was carried out from November 2003 to October 2004 at the domestic waste landfill site in Jiujiang City, Jiangxi Province. The size of the landfill structure is 21m×3.8m×6.0m. The test material is urban domestic waste in Jiujiang City, and two treatments are set up, quasi-aerobic landfill and anaerobic landfill respectively. The amount of landfill waste is 250 tons, and the compaction density of landfill waste is about 0.52 tons / m 3 , the porosity is about 37.9%.

[0074] HDPE membranes are laid on the bottom of the quasi-aerobic landfill structure, and a leachate drainage layer (gravel, thickness 50cm) is laid on the membrane, and a corrugated pipe with a diameter of 0.2m is laid horizontally at the bottom of the landfill structure as the main leachate collection pipeline , The length of the leachate drainage pipe is about 22m. A gravel gabion is laid around the leachate drainage pipe for protection, and the diameter of the gabi...

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Abstract

The invention relates to a method for pretreating landfill leachate by a quasi aerobiotic landfilling body. The method for pretreating comprises the steps: constructing an urban domestic garbage quasi aerobiotic landfilling body; designing a proper reflux process to perform home position treatment on leachate by using a unique aerobiotic-facultative anaerobic-anaerobic environment of the quasi aerobiotic landfilling body. The method has the advantages that concentration of BOD5, CODCr and NH4<+>-N of the leachate is effectively reduced, and a stabilizing process of a garbage heap is accelerated. A specific process comprises the steps: the leachate flows into the landfilling body by a pump by a collection system, in an aerobic zone, ammonia is oxidated to NO3<-> under the action of autotrophic nitrobacteria, in an anoxic zone, NO3<-> is reduced to N2 by using denitrifying bacteria with organic matter as an electron carrier, N2 is released from a liquid phase and conversion and removal of NH4<+>- are realized, and degradation methanogenesis of organic matter is realized. The method can solve the prominent problem of overhigh ammonia nitrogen concentration in the landfill leachate and effectively reduces concentration of BOD5 and CODCr in the leachate.

Description

technical field [0001] The invention relates to a method for pretreating leachate of urban waste landfill in a landfill, in particular to a method for pretreating landfill leachate by using a quasi-aerobic structure. technical background [0002] The leachate produced by municipal solid waste landfills contains a wide variety of organic pollutants, and COD Cr (chemical oxygen demand), BOD 5 (BOD) and NH 4 + -The high concentration of N and the imbalance of C / N ratio seriously affect its subsequent biological treatment process, so the treatment of landfill leachate has always been a difficult problem facing the world (Cao Jingzhe, 2003, characteristics and treatment strategies of urban landfill leachate[J]. Municipal Technology, 2003, 03: 183-185). [0003] The on-site independent treatment methods of landfill leachate can be divided into: physical and chemical treatment, land treatment and biological treatment. Among them, the physical and chemical treatment method is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 岳波黄启飞王琪苑广耀董路
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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