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New technique of prepositive replenishment treatment of denitrification denitrfication for preoclating water in two-stage mineralization garbage

A treatment process and mineralized waste technology, which is applied in the new process field of mineralized landfill leachate recharge treatment, can solve the problems of low removal rate of total nitrogen in effluent, failure of effluent ammonia nitrogen to meet the standard, high project cost and operating cost, etc.

Inactive Publication Date: 2005-01-12
TONGJI UNIV
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Problems solved by technology

[0002] The leachate treatment of landfill waste is currently a difficult problem worldwide. The main problems of leachate treatment using conventional water treatment technologies are: the effluent is difficult to meet the standard, and the project cost and operating cost are high.
However, the first problem existing in the treatment of leachate by using the mineralized waste series process is that the total nitrogen removal rate of the effluent is low, and the total nitrogen removal rate is usually lower than 50%.
The second problem is that there is a contradiction between the total nitrogen removal rate and the effluent water quality, that is, to maintain a high total nitrogen removal rate, the effluent total nitrogen is mainly in the form of ammonia nitrogen, which leads to the failure of the effluent ammonia nitrogen to meet the standard, and the high COD concentration of the effluent; if maintained Better effluent water quality means low ammonia nitrogen concentration and COD concentration, and the effluent total nitrogen removal rate is low

Method used

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  • New technique of prepositive replenishment treatment of denitrification denitrfication for preoclating water in two-stage mineralization garbage

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Embodiment Construction

[0012] Two cast iron columns with a diameter of 0.4m and a height of 1.3m are used as denitrification and nitrification units, and the denitrification and nitrification environments in different columns are maintained by controlling the air intake. The treated leachate comes from the adjustment pond of Shanghai Laogang Landfill.

[0013] The influent hydraulic load (leachate to be treated) of the denitrification unit is 0.02m 3 / m 2 · d, the reflux ratio is 130%. The hydraulic load of the return leachate of the nitrification unit is 0.03m 3 / m 2 ·d, the reflux ratio of effluent is 50-200%. The influent and effluent quality are as follows:

[0014] Water quality of leachate before and after treatment (except pH in mg / L)

[0015] Water quality indicator COD Cr BOD 5 TN NH 3 -N NO 3 -N pH

[0016] Influent concentration 11000~15000 4600~6000 1340~1770 1200~1650 <15 7.0~8.0

[0017] Effluent concentration 280~350 15~35 180~245 <...

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Abstract

A process for treating the percolated liquid of garbage features that the two stages of mineralized garbage are respectively used as nitrifying unit and denitrifying unit and the water coming from nitrifying unit is flowing back to dinitrifying unit for denitrifying it. Its advantage is high quality of treated water.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a new process for recharging mineralized landfill leachate. Background technique [0002] The leachate treatment of landfill waste is currently a worldwide problem. The main problems of leachate treatment using conventional water treatment technology are: the effluent is difficult to meet the standard, and the project cost and operation cost are high. At present, there is no technology that can meet the standard. The most fundamental problem is the high operating cost. The operating cost that fully meets the standard is usually around 80 yuan / ton. [0003] The recharge method to treat leachate is to use an appropriate method to reinject the leachate collected at the bottom of the landfill from the surface of the landfill cover layer or the lower part of the cover layer into the landfill site, and use the "biological filter" of the landfill garbage lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 徐迪民孙英杰
Owner TONGJI UNIV
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