Method for remediating cadmium-polluted soil through composite leaching
A cadmium-contaminated soil and soil-contaminated technology is applied in the field of soil heavy metal pollution prevention and control. It can solve the problems of large soil damage, low leaching rate, and secondary pollution. The effect of secondary pollution
Pending Publication Date: 2021-03-26
KUNMING UNIV OF SCI & TECH
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However, the leaching agent used for leaching has a large degree of damage to the soil, low leaching rate, high cost, and secondary pollution. Therefore, it is necessary to prepare an environmentally friendly, non-secondary pollution, and efficient composite leaching It is of great significance to deal with cadmium-contaminated soil
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[0025] The present invention will be further described in detail below with reference to the specific embodiments, but the protection scope of the present invention is not limited to the content. Specific steps are as follows:
[0026] (1) Referring to the “Soil Environmental Quality-Agricultural Land Soil Pollution Risk Control Standard (Trial)” (GB15618-2018), the risk control value of agricultural land and the classification standard of soil pollution degree, through the addition of cadmium (NO 3 ) 2 .4H 2 O was formulated into soils with mild, moderate and severe pollution levels, and the cadmium content in the polluted soil was 9.4 mg.kg, respectively -1 , 16.1mg.kg -1 , 23.5mg.kg -1 .
[0027] (2) Accurately weigh 1g of contaminated soil sample into a 20mL centrifuge tube, add 20mL of compound eluents with different pH and different concentrations, shake horizontally for a period of time in a constant temperature shaking incubator, centrifuge, and pass through a 0.4...
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The invention relates to a method for remediating cadmium-polluted soil through composite leaching, and belongs to the field of soil heavy metal pollution prevention and control. According to the method, rhamnolipid and citric acid are used as raw materials to prepare a composite eluting agent, cadmium-polluted soil with different pollution levels is eluted, and meanwhile, the pH, the concentration and the eluting time of the composite eluting agent are changed in the eluting process, so that the optimal eluting condition is found, and remediation of the cadmium-polluted soil is realized. According to the method, the leaching rate can be greatly increased, cadmium in the soil can be effectively removed, and the leaching time is greatly shortened. The pH value of the compounded solution isequal to 7, so that the change of physical and chemical properties of soil and the loss of nutrients are prevented, and therefore, the selected composite eluting agent through screening is an environment-friendly and efficient chemical eluting agent with engineering practical application value, and the cadmium content of the treated slightly, moderately and severely polluted soil is lower than thesoil pollution risk management and control standard in the soil pollution risk management and control standard (trial) for soil environmental quality agricultural land (GB15618-2018). The technologycan be used for remediating cadmium-containing soil with small area, centralized pollutants and high concentration.
Description
technical field [0001] The invention relates to the application of a composite eluent in repairing cadmium-contaminated soil, and belongs to the field of soil heavy metal pollution prevention and control. Background technique [0002] Soil is a very important resource and plays a pivotal role in people's daily production and life. In recent years, with the continuous development of industry, the problem of soil heavy metal pollution has become increasingly serious. Among them, the heavy metal cadmium is a serious threat to human health and ecological environment safety due to its strong biological toxicity and enrichment. Therefore, taking effective measures to remediate and prevent soil cadmium pollution is important for rational use of land and improvement of living conditions. Quality matters. [0003] The chemical leaching method is considered to be an efficient, fast and thorough technology for the treatment of soil heavy metal pollution. However, the leaching agent ...
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Login to View More IPC IPC(8): B09C1/08B09C1/02
CPCB09C1/08B09C1/02
Inventor 杨悦黄兵陈樑贾云娇
Owner KUNMING UNIV OF SCI & TECH