Method for treating UF permeation liquor during membrane extraction of water-soluble fertilizer containing humic acid from landfill leachate MBR+NF concentrated solution

Abstract

The invention belongs to the field of treatment of landfill leachate and particularly relates to a method for treating UF permeation liquor during membrane extraction of a water-soluble fertilizer containing humic acid from a landfill leachate MBR+NF concentrated solution. Refractory organics in the UF permeation liquor are decomposed through catalytic ozonation, a part of the organics are directly inorganized, a part of the organics are converted into floc and removed through coagulation sedimentation and sand filtration, and a part of the organics are converted into degradable organics and further purified through a biological aerated filter; ammonia nitrogen produced in the oxidation process and total nitrogen in the UF permeation liquor are purified through the biological aerated filter, finally, effluent meets standards and is discharged, and the secondary pollution problem during resource utilization of humic acid in the leachate MBR+NF concentrated solution is solved. The method is advanced, practical, economical and free of secondary pollution.

Description

technical field [0001] The invention belongs to the field of landfill leachate treatment, and in particular relates to a treatment method for UF permeate liquid from landfill leachate MBR+NF concentrated liquid membrane extraction of humic acid-containing water-soluble fertilizers. Background technique [0002] The leachate produced during the sanitary landfill, incineration, and composting of garbage is a type of high-concentration organic wastewater containing complex pollutants such as organic matter, ammonia nitrogen, heavy metals, and inorganic salts. Currently, the combined process of MBR+NF is commonly used to treat leachate. Although this process can make the treated effluent reach the standard, it will inevitably produce MBR+NF concentrated liquid that accounts for 1 / 8-1 / 4 of the original liquid volume. At present, the methods for treating this concentrated liquid include refilling landfill, advanced oxidation, recycling Incinerator spraying and evaporation, etc., b...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the UF permeated liquid in the water-soluble fertilizer containing humic acid cannot be treated by membrane extraction of the landfill leachate MBR+NF concentrated liquid, and to provide a two-stage ozone catalytic oxidation to mainly remove refractory organic matter in the UF permeated liquid , coagulation sedimentation and sand filtration to remove suspended organic matter, biological aerated filter for further purification of degradable organic matter and biological denitrification

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