A system and method for high-efficiency denitrification of old landfill leachate treated by a humic filler aerobic fixed bed anoxic MBR combination

Abstract

The invention belongs to the field of waste water treatment, and discloses a system and method for high-efficiency denitrification of aged landfill leachate treated with humic filler aerobic fixed bed anoxic MBR combination. The treatment steps are as follows: step 1) introducing the old landfill leachate into The aerobic nitrification reaction is carried out in the aerobic fixed bed of humic filler to obtain the treated effluent; step 2) the effluent treated in step 1) flows into the anoxic MBR reactor for anoxic denitrification treatment, first using humic filler The powerful nitrification ability of the microorganisms existing in the aerobic fixed bed humic filler can carry out sufficient aerobic nitrification reaction to realize the full nitrification of ammonia, and then combine with the anoxic MBR reactor to realize sufficient denitrification. The oxynitrification reaction produces sufficient nitrates to ensure sufficient nitrates in the anoxic MBR reactor for denitrification, provide good denitrification conditions, and finally achieve efficient and low-cost removal of total nitrogen.

Description

technical field [0001] The invention belongs to the technical field of biological denitrification treatment of refractory high-ammonia nitrogen old landfill leachate, and in particular relates to a system and method for treating old landfill leachate with a combined process for high-efficiency denitrification. Background technique [0002] There are 27,000 informal landfills and more than 1,600 formal sanitary landfills in my country, with a total waste stock of 8 billion tons and an area of ​​about 500 million square meters. At present, the mainstream treatment process for old landfill leachate produced by stock garbage is the double-membrane method, including "MBR+NF+RO" and "MBR+DT-RO" combined processes, but membrane pollution causes flux decline and concentrates are difficult to be effective The problems dealt with have not been perfectly resolved. How to develop a new process for treating old leachate without using membrane technology is an important problem faced by ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of low denitrification efficiency in the treatment of aged landfill leachate in the prior art, the present invention utilizes a treatment unit constructed by using humic filler aerobic fixed bed and anoxic MBR reactor in multi-stage series to treat aged landfill leachate Firstly, the strong nitrification ability of indigenous microorganisms in the humic packing aerobic fixed bed is used to carry out sufficient aerobic nitrification reaction to realize the full nitrification of ammonia, and then combined with the anoxic MBR reactor to achieve sufficient denitrification. Sufficient aerobic nitrification in the step produces sufficient nitrate to ensure sufficient nitrate in the anoxic MBR reactor, provide good denitrification conditions for it, and finally achieve high-efficiency and low-cost removal of total nitrogen

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