System and method for leachate treatment in sanitary landfill

Abstract

The invention belongs to the field of recycling economy and water treatment and discloses a system and a method for leachate treatment in a sanitary landfill. The system is formed by sequentially connecting a regulating tank, an upflow anaerobic reaction tank, an anaerobic and aerobic biochemical reaction tank, a secondary sedimentation tank, a coagulation sedimentation tank, an immersion-type ultra-filtration system, a nano-filtration system and an advanced oxidation system. The system is capable of carrying out the overall treatment on waste leachate, achieving the advanced treatment of the waste leachate in the sanitary landfill in a way that the physical treatment, chemical treatment and biological treatment are integrated based on the principle that the contaminants having different particle sizes and properties in the waste leachate are classified and achieving the classification of nearly 90 organic contaminants in the waste leachate, thus the treated effluent can fully meet the requirement for the effluent concentration limit of water pollution according to 'the standard for pollution control on the landfill site of municipal solid waste' (GB16889-2008), the system can operate stably for a long time, and the treatment cost is lower than that according to the secondary disc tube reverse osmosis (DT-RO) process.

Description

technical field [0001] The invention relates to the treatment of landfill leachate, which belongs to the field of circulating water treatment, in particular to a treatment system and method for leachate of a garbage sanitary landfill. Background technique [0002] There are not many treatment processes that can meet my country's current landfill leachate discharge standards, mainly as follows: [0003] (1) Deamination tower-UASB-SBR-microfiltration / ultrafiltration-RO reverse osmosis membrane; [0004] (2) UASB-A / O MBR-NF nanofiltration; [0005] (3) Microfiltration - two-stage disc reverse osmosis membrane (DT-RO); [0006] In the above process (1), using a deammonization tower to remove ammonia nitrogen by a physical and chemical method will bring about a series of problems, mainly due to the secondary pollution of ammonia nitrogen caused by the deammonization tower, the inability to handle the absorption liquid, and the high energy consumption of ammonia nitrogen combust...

AI Technical Summary

Problems solved by technology

However, the facts show that German technology is not suitable for landfill leachate without any sorting treatment in China, especially for leachate with high concentration of COD and ammonia nitrogen characteristics in large cities, such as: a landfill in Beijing The DTRO treatment process used in the early stage was unable to continue to operate after 3 months, and finally had to be treated with MBR biochemical method and NF membrane process

In addition, the concentrated solution treated by DTRO in Germany adopts the method of evaporation, concentration and crystallization, so that pollutants and salts are completely out of the system, while the existing domestic concentrated solution treatment method is to use backfilling to landfill, ammonia nitrogen and salt classes are not removed

Ammonia nitrogen has an obvious inhibitory effect on anaerobic microorganisms, and salts will lead to the accumulation of leachate salinity in landfills. Therefore, reverse osmosis concentrated water recharge artificially deteriorates the water quality of landfill leachate process, and eventually reacts on the expensive treatment system, resulting in a sharp increase in the reverse osmosis pressure after a period of time, and the deterioration of the effluent water quality

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