Device and method for treating landfill leachate with low-temperature plasma coupled biological method

Abstract

The invention relates to a device and method for treating landfill leachate with a low-temperature plasma coupling biological method. According to the device and method for treating the landfill leachate with the low-temperature plasma coupling biological method, a leachate spray gun and a demister are arranged at the top end of an oxidation reactor, a low-temperature plasma electrode is arranged on the lower middle portion of the oxidation reactor, and air holes are formed in the bottom of the oxidation reactor; landfill leachate enters the oxidation reactor through the leachate spray gun, low-temperature plasma treatment is conducted on the leachate by the low-temperature plasma electrode, and the leachate is discharged through a first leachate conduit after reaction; a reinforced aerating device is installed in a deep oxidation reactor, and outlet water of the oxidation reactor enters the deep oxidation reactor for deep oxidation reaction; a water distributing device, a filler bed and a filtering layer are arranged in a filler bed bioreactor, and the leachate passes through the water distributing device, the filler bed and the filtering layer and then is discharged through a second leachate conduit. According to the device and method for treating the landfill leachate with the low-temperature plasma coupling biological method, the biodegradability of the leachate is improved through physicochemical treatment, the effect of removing organic matter, chroma and ammonia nitrogen in the leachate is improved, organic matter and oxynitride in the leachate are further removed through the filler bed bioreactor, and the whole system has the advantages of being high in efficiency and low in consumption.

Description

technical field [0001] The present invention relates to an advanced oxidation coupled biological process technology for treatment of landfill leachate in domestic waste incineration plants, landfills or transfer stations, in particular to a device and method for treating landfill leachate using low-temperature plasma coupled biological process, It belongs to the field of purification of environmental pollutants. Background technique [0002] With the development of our country's economy and the improvement of people's living standards, the output and treatment of urban domestic waste have been increasing in recent years. Domestic waste landfill and incineration are the two main methods of waste disposal. More than 90% of my country's waste uses the above two methods. processed in a variety of ways. Due to the high moisture content of garbage in my country, a large amount of landfill leachate will be produced during the process of transshipment, treatment and disposal. The c...

AI Technical Summary

Problems solved by technology

The concentration of organic pollutants in landfill leachate is as high as 3000~80,000mg / L, the concentration of suspended solids is 1000~10,000mg / L, the concentration of ammonia nitrogen is 2000~3000mg / L, and it also contains a large amount of inorganic substances with high concentration, such as Ca 2+ , Mg 2+ 、Na + , SO 4 2- , Cl - etc. It has the characteristics of high pollutant concentration, large fluctuation, complex composition, high content of refractory organic matter, high chroma, and C:N:P ratio imbalance, etc. It is difficult to treat leachate up to standard

[0003] The problems existing in the leachate treatment plant are mainly manifested in: (1) Poor shock load resistance

Biological treatment of sewage generally requires relatively stable sewage water volume and water quality. In waste treatment facilities, during the rainy season, the capacity of the regulating tank is relatively insufficient, which will inevitably cause an impact on the load of the biological treatment system and affect the treatment effect; , the amount of leachate is very small, and the concentration of pollutants such as ammonia nitrogen is high, which inhibits the growth of microorganisms

(2) Poor adaptability of single biological treatment process

With the prolongation of the landfill time, there will be a serious imbalance of nutrient elements at the back end of the leachate treatment process, the carbon-nitrogen ratio of the leachate will decrease, and the biodegradability of COD and TN will decrease.

(3) Biological decolorization is quite difficult

[0004] Physicochemical treatment process can quickly respond to the fluctuation of water quality and quantity and adjust the process parameters in time, especially the advanced oxidation process has a good treatment effect on improving the biodegradability of wastewater, but it has the disadvantages of high treatment cost, complicated operation and high energy consumption.

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