Landfill leachate treatment process and treatment device of landfill leachate

Abstract

The invention belongs to the field of wastewater treatment, in particular to a landfill leachate treatment process and a treatment device of landfill leachate. The treatment process comprises the following steps: 1) filtering wastewater with a nanofiltration membrane; 2) performing micro-electrolysis treatment on water produced by nanofiltration in step 1); 3) adding hydrogen peroxide into the water produced by nanofiltration subjected to micro-electrolysis treatment in step 2) and performing Fenton treatment; 4) performing electrocatalytic oxidation treatment on the water produced by nanofiltration undergoing Fenton treatment in step 3), and discharging the wastewater up to standard; 5) purifying concentrated water produced by nanofiltration in step 1). A treatment method combining nanofiltration and advanced oxidization is adopted instead of a reverse osmosis treatment process, so that salts and COD (Chemical Oxygen Demand) in percolate can be treated properly to form a positive cycle, up-to-standard discharge can be achieved, and the problem of difficulty in treating a reverse osmosis concentrated solution when the reverse osmosis treatment process is adopted is solved.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a landfill leachate treatment process and a treatment device thereof. Background technique [0002] Landfill leachate refers to the water that leaks out after the accumulation of garbage in landfills or incinerators. This type of wastewater has high salt content, high COD, high ammonia nitrogen and total nitrogen content, and contains heavy metals, with poor biochemical properties. [0003] In the prior art, most of the landfill leachate treatment adopts the following processes: a combination of biochemistry, nanofiltration, and reverse osmosis; a combination of biochemistry and reverse osmosis. In the above method, the permeate of reverse osmosis and reverse osmosis is discharged, and the concentrate is recharged. Because reverse osmosis has a high interception rate of pollutants, the waste water can be discharged up to the standard. Therefore, the final treatment of any of ...

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Problems solved by technology

[0004] However, after the reverse osmosis membrane intercepts all the salt and pollutants and COD (hereinafter referred to as COD) in the wastewater, the salt and COD are concentrated and enriched in the concentrated solution of reverse osmosis. Currently, the concentrated solution of reverse osmosis is Most of the treatment adopts the method of recharge, but the recharge of the concentrate will cause the concentration of salt and pollutants in the entire landfill leachate system to increase, and the concentration of salt and pollutants will continue to accumulate and increase, which will eventually make the biochemical system and the reaction system The osmosis system is paralyzed, and the treatment of reverse osmosis concentrate has become a difficult point in the current industry

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