Apparatus and method of treating city domestic refuse percolation liquid by two-stage UASB+A/O technique

Abstract

This invention relates to a treatment device and method for municipal solid waste leachate, belonging to wastewater treatment technology field. There are contradictions between anaerobic degradation of organic matter and biological denitrification in the existing processes and the equipments of the existing processes are expensive to run. The invention includes a two-level UASB+A / O processing device and method for municipal solid waste leachate. Methane production by anoxic denitrification and anaerobic reaction is carried out in one-level UASB (II) and further anaerobic reaction of methane production is carried out in two-level UASB (III). Anoxic reaction is carried out first in A / O reactor to remove part of the residual organic matter and then aerobic nitrification reaction is carried out to remove ammonia nitrogen. The invention can adapt to water quality change of leachate well without any physicochemical treatment. Biochemical organic matter and high ammonia nitrogen can all be removed through biological treatment. Wide application can greatly reduce the construction and operation costs of leachate treatment and greatly enhance municipal solid waste leachate treatment efficiency.

Description

technical field [0001] The invention relates to a device and method for completely removing biochemical organic matter and high ammonia nitrogen from urban domestic garbage leachate without physical and chemical pretreatment, belongs to the technical field of biochemical sewage biological treatment, and is suitable for urban domestic garbage leachate and other such as sludge Anaerobic digestion liquid, aquaculture wastewater and other organic industrial wastewater treatment with high ammonia nitrogen and high organic matter. 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 high-concentration organic wastewater with complex components. The pollution disc...

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Problems solved by technology

[0006] The existing process is a combination of anaerobic reaction and aerobic reaction, and denitrification is carried out after anaerobic reaction, which makes the anaerobic degradation of organic matter and biological nitrogen removal in this process an irreconcilable contradiction: if anaerobic is sufficient, Then the subsequent anoxic denitrification will be inefficient due to the lack of organic carbon sources, and physical and chemical processes such as membrane technology must be added to further denitrification; and if the anaerobic treatment effect is poor, the organic load of the aerobic reactor is too high, resulting in a large amount of heterogeneous denitrification. Oxygen bacteria grow and reproduce, while the growth and reproduction of autotrophic nitrifying bacteria will be inhibited, and sufficient denitrification cannot be completed, resulting in the failure of system denitrification

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