Method for degrading landfill leachate membrane concentrate by catalyzing hydrogen peroxide with single copper salt

Abstract

The invention discloses a method for degrading landfill leachate membrane concentrate by catalyzing hydrogen peroxide with a single copper salt. The method comprises the following steps: adding a copper salt catalyst and hydrogen peroxide into the landfill leachate membrane concentrate, and carrying out oxidation reaction under the conditions of controlling the pH value of the system to 4-8 and the temperature to 40-60 DEG C. According to the method, the characteristic that Cu (II) can catalyze hydrogen peroxide in a multi-stage mode to generate active oxidizing substances is fully utilized for degrading organic matter in the membrane concentrated solution, a good oxidative degradation effect can be achieved even under the nearly neutral condition, meanwhile, the oxidation reaction is a homogeneous reaction process, no precipitated sludge is generated, the using amount of a copper salt catalyst is small, and the cost is low. The cost of the catalyst is reduced, and the addition amountof Cu (II) is lower than the pollution control standard 40mg / L (GB16889-2008) of a domestic waste landfill site.

Description

technical field [0001] The invention relates to a method for treating landfill leachate membrane concentrate, in particular to a method for using a single copper salt to catalyze hydrogen peroxide to degrade landfill leachate membrane concentrate through multi-stage oxidation, and belongs to the technical field of organic wastewater treatment. Background technique [0002] Landfill leachate is a kind of high-concentration toxic and harmful organic wastewater with complex components. In the prior art, the combined process of biochemical + membrane treatment technology is mainly used for treatment. This process produces a large volume of membrane concentrate. The membrane concentrate contains a large amount of refractory organic matter, with high salt content and poor biodegradability. At present, the treatment and disposal of membrane concentrate mainly includes three methods: one is transfer, such as recharge method; the other is reduction, such as evaporation and membrane ...

AI Technical Summary

Problems solved by technology

Especially the Fenton treatment technology, which is simple to operate and produces highly oxidative OH, can degrade organic matter efficiently and quickly, but the traditional Fenton technology has a narrow pH range (2-3), produces iron sludge and cannot be regenerated. shortcoming

[0003] Chinese patent (publication number CN111453923A) discloses a treatment equipment and process for landfill leachate membrane concentrate. The membrane concentrate after combined processes such as reaction tank, nitrification reaction tank, and MBR reaction tank can be discharged up to the standard, but the process is long and consumes a lot of chemical reagents; Chinese patent (publication number CN111253013A) discloses a physical-chemical combined biochemical treatment process, First, acid precipitation-precipitation treatment is used to remove a large amount of humic acid in the landfill leachate membrane concentrate, followed by two-stage electro-Fenton oxidation treatment to oxidize and decompose refractory organic matter, and finally use electrocatalytic oxidation treatment to remove remaining organic matter, ammonia nitrogen and heavy metals Pollutants such as

Although the effluent can be stably discharged up to the standard, a large amount of acid is required to adjust the pH and produce secondary precipitation pollutants, which require subsequent treatment

The Chinese patent (publication number CN111320316A) discloses a method for treating landfill leachate membrane concentrate, which sequentially undergoes electrocatalytic oxidation, coagulation precipitation, ultrafiltration and evaporation to realize the purification treatment of landfill leachate membrane concentrate. The catalytic oxidation process needs to adjust the pH to 3-6, and the coagulation and sedimentation process needs to adjust the pH to 8-11, which consumes a large amount of acid-base reagents and produces sedimentation sludge, and the electrocatalytic process and evaporation process consume a lot of energy.

Although the evaporation process has achieved reduction, and the production of industrial salt has achieved resource utilization, but the high temperature and high pressure operating conditions have serious equipment corrosion and high energy consumption.