Vegetative cover treatment method of long buring age buring field percolate

Abstract

The present invention relates to a domestic refuse landfill yard percolation liquor treatment method by utilizing vegetation system. Said method includes the following steps: firstly, constituting vegetation soil layer and irrigation water-conveying installation, then utilizing percolation liquor whose BOD5 mass volume concentration is less than 200 mg / L to make irrigation. Said invention also provides the concrete irrigation steps and measures. It is characterized by that it utilizes plant root system and microbial metabolism action in the soil layer to purify the percolation liquor. The removal rates of COD, ammonia nitrogen and total nitrogen are respectively up to 90%, 95% and 80%.

Description

technical field [0001] The invention relates to a leachate treatment process of a domestic garbage landfill, in particular to a treatment technology for biologically treating the effluent of the leachate with a long fill age or with a short fill age leachate having similar water quality characteristics. The invention belongs to the technical field of solid waste treatment and disposal. Background technique [0002] The main secondary pollution in the landfill disposal process of domestic waste is landfill leachate, which has the characteristics of high pollution load and variable water quality, see ('Present and Long-Term Composition of MSWlandfill leachate: A Review. 'Kjeldsen P, Barlaz M A, Rooker A P, et al.Critical Reviews in Environmental Science and Technology 32(4):297-336, 2002), there is a great threat to the environment around the landfill. Although the treatment of landfill leachate has been highly valued, and a wide range of landfill leac...

AI Technical Summary

Problems solved by technology

Although the treatment of landfill leachate has been highly valued, and a wide range of landfill leachate treatment processes have been developed, these technologies still have serious defects in practical application: or the treatment cost is low but the treatment effect is low. , Especially poor adaptability to leachate of different filling ages, or good treatment effect but high treatment cost

The specific performance is as follows: 1) Although the biological (including aerobic and anaerobic) treatment methods with lower processing costs can effectively (COD, BOD) 5 removal rate > 80%) to treat landfill leachate with a short landfill operation period (less than 5 years) (also known as short-fill age leachate), but for landfill with a long landfill operation period (more than 5 years) Leachate (also known as long-filling leachate) has almost no treatment effect, see ('Review: Anaerobic treatment of municipal sanitary landfill leachates: the problem of refractory and toxic components'Alkalay D, Guerrero L, Lema J M et al .World Journal of Microbiology and Biotechnology 14 (3): 309-310, 1998); Not only that, even if the current most perfect biological treatment process is dealing with short-age leachate, the COD of the treated water is generally around 1000mg / L , it is difficult to meet the relevant national discharge standards, and there is still a greater threat to discharge into water bodies

2) The physical and chemical treatment method has two problems of technology and cost

Physicochemical treatment generally targets the biologically treated effluent of long-age leachate and short-age leachate that are difficult to biologically treat. In practical applications, only two types of technical methods have the possibility of making the effluent reach the standard, namely advanced oxidation methods and Nanofiltration or reverse osmosis in membrane technology, but these are just two high-cost physical and chemical treatment methods, and there are obvious economic obstacles in their application ('Advanced physico-chemical treatment experiences on young municipal landfill leachates' Ozturk I, Altinbas M, Koyuncu I, et al.Waste Management, 23:441-446, 2003); at the same time, there are certain environmental risks in physical and chemical methods

Due to the complexity of the chemical oxidation process, there may be highly toxic trace pollutants in the treated water. The mechanism of the membrane method is interception, and the intercepted concentrated pollutants still have the problem of reprocessing and disposal.

[0003] Therefore, the treatment technology of long-fill-age leachate or short-fill-age leachate with similar water quality characteristics after biological treatment is still the main challenge in the secondary pollution control of domestic waste landfills

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