Ozone oxidation treatment leachate nanofiltration concentrate treatment method

Abstract

The invention relates to an ozone oxidation treatment leachate nanofiltration concentrate treatment method. The method comprises the following steps: adding a leachate nanofiltration concentrate, iron trichloride and polyacrylamide to a stirring tank, mixing, and allowing a supernatant in a precipitation pool to flow into a clear liquid collecting tank; adding the supernatant to the top of an ozone reaction tower through an elevator pump, sending an ozone gas generated in an ozone generator to the lower portion of the ozone reaction tower, allowing the supernatant to be in contact with the ozone gas in a cycle manner in order to carry out an oxidation reaction, discharging oxidized wastewater to an intermediate water tank, and storing the oxidized wastewater in the intermediate water tank; and conveying wastewater in the intermediate water tank to a denitrification tank through a water feed pump, continuously carrying out plug-flow aeration in the denitrification tank, carrying out a denitrification reaction on wastewater, allowing obtained wastewater to automatically flow into a nitrification tank, carrying out blast aeration to carry out a nitrification reaction, lifting and conveying wastewater obtained after the nitrification reaction to an ultrafilter membrane assembly through a conveying pump, carrying out solid-liquid separation, returning a treated ultrafiltration concentrate to the denitrification tank, and discharging clear liquid outlet water. The method has the characteristics of simple process route, high treatment cost performance and no secondary pollution.

Description

technical field [0001] The invention relates to a method for treating leachate nanofiltration concentrate by ozone oxidation, and belongs to the technical field of leachate nanofiltration concentrate treatment. Background technique [0002] The leachate produced during the landfill process of municipal solid waste has the characteristics of high concentration of organic pollutants, high concentration of ammonia nitrogen, high concentration of heavy metal ions, etc., and it is very difficult to treat. At home and abroad, there are traditional biological methods, membrane separation and combination methods for the treatment of landfill leachate, among which membrane biochemical reactor and disk tube reverse osmosis are currently the mainstream treatment processes. In order to meet the special limit value discharge requirements in the new GB16889-2008 standard, the leachate treatment process usually adopts the "biochemical + membrane" process, and nanofiltration or reverse osmo...

AI Technical Summary

Problems solved by technology

After the leachate nanofiltration concentrate is returned to the adjustment tank, with the increase of the leachate nanofiltration concentrate, the membrane pressure of the treatment system will increase, which will cause the treatment quality of the treatment system to decline, and even cause the treatment system to collapse.

The recharge method landfill requires less leachate production and can only be used in small waste disposal sites. However, due to the accumulation of salt and the increase in conductivity, the recharge landfill will deteriorate the treatment system, so its use is limited. sex

The combination of coagulation sedimentation, resin adsorption, and activated carbon adsorption requires a large dosage of chemicals, resulting in a large amount of sludge, and the treatment cost is very expensive.

However, evaporation to dryness and incineration cannot cause secondary pollution, and the treatment effect is not good.

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