Short-path deep biological denitrogenation method for city garbage percolate

A technology for biological denitrification and urban waste, applied in the direction of aerobic and anaerobic treatment, to achieve the effect of saving aeration costs

Active Publication Date: 2009-09-02
JIANGSU YULONG ENVIRONMENTAL PROTECTION
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The complete nitrification of high-ammonia nitrogen landfill leachate is a difficult problem in sewage treatment, and the stable and efficient short-range biological denitrification of landfill leachate is a major breakthrough in leachate treatment, which has not been reported in the existing domestic and foreign literature

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  • Short-path deep biological denitrogenation method for city garbage percolate
  • Short-path deep biological denitrogenation method for city garbage percolate

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Experimental program
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Effect test

specific Embodiment approach 1

[0043] Embodiment 1 (treatment of landfill leachate in early stage)

[0044] Combined with examples such as figure 2 Shown, the running operation procedure of technique of the present invention:

[0045] The water used for the experiment was taken from a regulating tank of a landfill in Beijing. The leachate was dark black, viscous, and had a foul smell. The water quality of the leachate: COD: 7000-25000 mg / l; BOD 5 : 3500~14000mg / l; NH 4 + -N: 1250~2450mg / l; SS: 2000~4000mg / l; Alkalinity: 8000~11000mg / l; TP: 9~15mg / l; pH: 7.2~7.9. Sampling and analysis are performed every two days, and the analysis methods used in the test are all standard methods issued by the State Environmental Protection Agency. The leachate is a typical municipal solid waste leachate, with high concentrations of organic matter and ammonia nitrogen, but relatively low heavy metal content. test system such as figure 1 As shown, it consists of two levels of UASB and A / O pool. UASB1 has an inner diam...

specific Embodiment approach 2

[0056] Embodiment 2 (processing of landfill leachate in late stage)

[0057] The "two-stage UASB+A / O" system is used to treat typical late-stage municipal solid waste leachate, the backflow treatment water is denitrified in the first-stage UASB, the methane-producing reaction is carried out in the second-stage UASB, and the A / O reactor is used for NH 4 + -N short-cut nitrification reaction. The organic matter removal rate of the system is 50%-70%, and the system effluent COD is 1000-1500mg / L. When the operating temperature is 17 ~ 29 ℃, stable NO 2 - -Short-cut nitrification with N accumulation rate of 90%-99%. NH during the test 4 + -N load ALR=0.28~0.60kgNH 4 + -N·m -3 d -1 , NH 4 + -N nitration rate=90%~100%. When ALR4 + -N·m -3 d -1 , nitrification rate > 98%, effluent NH 4 + -N-1 . In influent COD / NH 4 + - When N=2-3, the removal rate of inorganic nitrogen TIN=70%-80%. The activated sludge was detected by fluorescence in situ hybridization (FISH), an...

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Abstract

The invention discloses a short-range deep biological denitrification method for urban garbage leachate, which belongs to the technical field of sewage treatment. The prior art cannot realize stable and efficient short-range nitrification and denitrification. The invention adopts a two-stage UASB+A / O process to realize the biological denitrification of urban garbage leachate through short-range nitrification and denitrification. The short-path denitrification by reflux of treated water is firstly carried out in the first-stage UASB II, the methanogenic reaction is carried out in the second-stage UASBIII, and the ammonia nitrogen is removed by short-path nitrification in the A / O reactor IV. Realize the short-range nitrification approach: adjust the effluent reflux ratio and sludge reflux ratio according to the carbon-nitrogen ratio of the influent, so that the free ammonia FA in the anoxic zone of A / O reactor IV is 30-70mg / L, and only inhibits NO2--N oxidizing bacteria , but does not inhibit NH4+-N oxidizing bacteria, 90-99% of NH4+-N is oxidized to NO2--N; through the "ammonia valley" effective and accurate control of aeration time to maintain stable short-term nitrification. Then, the short-range biological denitrification is completed through the return flow of treated water and the return flow of sludge respectively. The short-range nitrification and denitrification of the present invention can save 25% of the oxygen supply; save 40% of the carbon source required for denitrification; and reduce the amount of sludge generated.

Description

technical field [0001] The invention relates to a method for removing biochemical organic matter and high ammonia nitrogen in high-ammonia-nitrogen organic wastewater through stable and efficient short-range nitrification and denitrification, which belongs to the technical field of biochemical sewage biological treatment and is suitable for municipal solid waste leachate and other anaerobic sludge such as sludge Treatment of high ammonia nitrogen organic industrial wastewater such as digestive juice and aquaculture wastewater. Background technique [0002] At present, the annual total amount of garbage in our country is 240 million tons, and the annual growth rate of urban domestic garbage in recent years is above 8% to 10%. At present, about 90% of the garbage in our country is disposed of by landfill, and landfill will produce a large amount of landfill leachate. Landfill leachate is a kind of organic wastewater with complex components and high ammonia nitrogen. The natio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 彭永臻张树军王淑莹
Owner JIANGSU YULONG ENVIRONMENTAL PROTECTION
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