Method and system for treating landfill leachate

Abstract

The invention discloses a method and system for treating landfill leachate. The system includes a first conditioning tank, an ultrasonic reaction tank, a second conditioning tank, a first-stage iron-carbon micro-electrolysis tank, and a first coagulation sedimentation tank connected in sequence. , carrier microbial biochemical treatment system and environmental protection packing filter device; the ultrasonic reaction tank is used to make the effluent of the first conditioning pool undergo ultrasonic reaction; the first-level iron-carbon micro-electrolytic pool is used to make the effluent of the second conditioning Electrolytic catalytic oxidation reaction; the first coagulation sedimentation tank is used to coagulate and settle the effluent of the first-level iron-carbon micro-electrolytic cell; the carrier microbial biochemical treatment system includes successively connected hydrolytic acidification tanks and anaerobic-anoxic-aerobic method Biological denitrification and phosphorus removal system; environmental protection filler filter device is used to filter the effluent of the carrier microbial biochemical treatment system. The invention combines a physical and chemical treatment system with a biochemical treatment system, and the total nitrogen content of the treated tail water can be reduced to 20-30mg / L.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage treatment, in particular to a method and system for treating landfill leachate. Background technique [0002] Landfill leachate refers to the moisture contained in the garbage itself in the landfill, the rain and snow water and other moisture entering the landfill, deducting the saturated water holding capacity of the garbage and the covering soil, and passing through the garbage layer and the covering soil. A high concentration wastewater. High concentration of ammonia nitrogen is one of the water quality characteristics of leachate, and the concentration of ammonia nitrogen in leachate generally ranges from tens to thousands of milligrams per liter. According to the change law of leachate water quality produced by domestic waste landfills, with the extension of landfill time, the concentration of ammonia nitrogen in leachate tends to increase, and the biochemical proper...

AI Technical Summary

Problems solved by technology

According to the change law of leachate water quality produced by domestic waste landfills, with the extension of landfill time, the concentration of ammonia nitrogen in leachate tends to increase, and the biochemical properties decrease.

[0003] Due to the complex composition of landfill leachate, high pollution concentration, and high content of heavy metal ions, and with the aging of landfill leachate, biochemical disorders of leachate generally occur, high operating costs, pollutant accumulation, and total nitrogen exceeding the standard and other problems, the original process is difficult to meet the actual operation needs, and it is difficult to achieve stable water discharge standards

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