Efficient denitrification system and method for treating aged landfill leachate through combination of humic filler aerobic fixed bed and anoxic MBR

Abstract

The invention belongs to the field of wastewater treatment, and discloses an efficient denitrification system and method for treating aged landfill leachate through combination of a humic filler aerobic fixed bed and an anoxic MBR. The method includes 1) introducing aged landfill leachate into the humic filler aerobic fixed bed for aerobic nitrification reaction treatment to obtain treated effluent; (2) enabling the effluent treated in the step (1) to automatically flow into the anoxic MBR for anoxic denitrification treatment. Firstly, sufficient aerobic nitrification is performed by utilizingthe strong nitrification capacity of microorganisms existing in a humic filler of the humic filler aerobic fixed bed to realize sufficient nitrification of ammonia, and sufficient denitrification isachieved through combination with the anoxic MBR. Sufficient nitrate is generated by utilizing the sufficient aerobic nitrification reaction in the previous step, so that the sufficient nitrate in thedenitrification of the anoxic MBR is ensured, a good denitrification condition is provided for the anoxic MBR, and finally, the high-efficiency and low-consumption removal of total nitrogen is realized.

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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