Method for restoring soil polluted by arsenic and organic matter
A technology for contaminated soil and organic matter, applied in the field of arsenic and organic matter contaminated soil remediation, can solve the problems of low remediation efficiency, high treatment cost, inability to effectively remove soil heavy metal pollution sources, etc., and achieve good treatment effect and low heat energy consumption.
Inactive Publication Date: 2019-01-18
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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Problems solved by technology
[0006] However, for the treatment of arsenic and organic matter pollution, the existing technology has problems such as low repair efficiency, high treatment cost, and inability to effectively remove soil heavy metal pollution sources.
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[0021] Excavate the soil of arsenic and oil-contaminated plots, and sample the total arsenic in the soil to be 122.39mg / kg and the oil content to be 963.23mg / kg. Take 5kg of soil samples and process them into 2-5mm soil particles through a crusher; configure 1mol / kg L sodium citrate solution, add the prepared sodium citrate solution to the soil particles in a ratio of 1L / kg, adjust the soil pH value to 4, then add an appropriate amount of hydrogen peroxide solution and ferrous chloride powder, mix and stir for 30min , to oxidize and degrade the high-molecular substances in the organic matter into low-molecular substances, and filter to obtain the soil mixture; add an appropriate amount of iron powder to the soil mixture, stir well, and convert the pentavalent arsenic in the soil into trivalent arsenic ions, forming Volatile arsenic chloride; the soil is sent to a vacuum heat treatment device with a system pressure of 1Kpa, heated to 200°C for 30 minutes, and the arsenic chlorid...
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Abstract
The invention provides a method for restoring soil polluted by arsenic and an organic matter. The method comprises the steps that firstly the soil in an arsenic and organic matter polluted land parcelis smashed, a sodium citrate solution, a hydrogen peroxide solution and ferrous chloride powder are added to be mixed and stirred for 30 minutes, and the mixture is filtered to obtain a soil mixture;an appropriate amount of iron powder is added; the mixture is sent into a vacuum thermal treatment device and heated to 200 DEG C or above, heat preservation is conducted for 30 minutes, and arsenicchloride and the low molecular organic matter in the soil volatilize from the soil, and thus is separated from the soil; and the obtained soil is washed by adopting pure water, iron ions in the soil are separated into the water, an appropriate amount of calcium chloride powder is added into the washed soil and mixed uniformly, and the soil is regulated to be slightly alkaline to obtain the restored soil. The method can effectively treat an organic complex and a high polymer matter in the soil and transforms arsenic into a volatile matter with a low boiling point, and the method has the advantages of simpleness and easiness in operation and good treatment effect, and can remove arsenic and the organic matter from the soil.
Description
Technical field: [0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating soil contaminated by arsenic and organic matter. technical background: [0002] There are 1.8 to 2 million cancer cases and 1.4 to 1.5 million deaths in the country every year, which is related to the excessive pollution of agricultural products to a certain extent. Soil heavy metal pollution has gradually become the focus of public attention. [0003] Soil arsenic pollution mainly comes from atmospheric deposition, sewage irrigation and spraying of arsenic-containing pesticides. The content of arsenic in China's surface soil is distributed in a north-south direction. The arsenic content in the soil at higher altitudes is higher than that at lower altitudes. It decreases from the Qinghai-Tibet Plateau, Southwest China, and South China to the Northeast. Geochemical linkages. Among them, in a local area, as the topography goes from hi...
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Login to View More IPC IPC(8): B09C1/08B09C1/02B09C1/06
CPCB09C1/08B09C1/02B09C1/06
Inventor 不公告发明人
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD