Method for degrading dimethyl phthalate in polluted soil through photocatalysis

Abstract

The invention belongs to the technical field of soil pollution treatment, and discloses a method for degrading dimethyl phthalate in polluted soil through photocatalysis. The method comprises the following steps that according to the pH value and the water content of the soil, a minute amount of dilute hydrochloric acid or dilute sodium hydroxide solution is added into the polluted soil, and a small amount of tap water is added complementally, so that the pH value of the soil is enabled to be about 7-8, and the water content of the soil is enabled to be about 30%; a nano titanium dioxide catalyst is added into the soil obtained from the last step, and uniform mixing is carried out; and the soil obtained from the last step is flatly laid into a soil layer with the thickness of 5-10 cm, thesoil layer is put into a closed container provided with an ultraviolet high-pressure mercury lamp, a power switch of the high-pressure mercury lamp is turned on, the ultraviolet light starts to irradiate the soil, and the target object in the soil starts to be degraded. According to the method, the lighting time is adjusted according to the content of the target object in the soil, so that the content of the target object in the polluted soil is reduced to a required content; and the method has the advantages that the repairing efficiency is high, the speed is high, the application objects arewide, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, in particular to a method for photocatalytically degrading dimethyl phthalate in polluted soil. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Soil is the material basis for sustainable economic and social development. It is related to the health of the people and the construction of a beautiful China. Protecting the soil environment is an important part of promoting the construction of ecological civilization and maintaining national ecological security. At present, the overall situation of my country's soil environment is worrying, and the pollution in some areas is relatively serious, including the pollution of organic pollutants. Phthalate esters (PAEs) are a class of plasticizers, which are persistent organic pollutants. They are difficult to degrade in nature and generally take years or even hundred...

AI Technical Summary

Problems solved by technology

[0007] my country's soil remediation started in the early 21st century. Although the research and development of remediation technology has made significant progress, the existing remediation measures are relatively extensive. Compared with advanced countries such as Europe and America, there is still a big gap in remediation technology, equipment and large-scale application. The removal of high-concentration organic pollutants and the remediation of contaminated soil with high clay content are current difficulties

[0008] At present, there is a serious shortage of rapid and in-situ repair technology and equipment independently developed in China, lack of practical repair technology and engineering construction experience suitable for my country's national conditions, and lack of management technology for large-scale application and industrial operation

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