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A remediation method of cd-pb-cr(vi) composite polluted soil

A technology of cd-pb-cr and compound pollution, which is applied in the field of soil remediation, can solve the problems that the remediation effect of FeS particles has not been studied, and achieve the effect of short remediation period, low cost of chemicals and simple steps

Active Publication Date: 2022-08-05
中南安全环境技术研究院股份有限公司
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Problems solved by technology

However, this technical solution only studies the remediation effect of FeS particles on Cr(VI) contaminated soil, and does not study the remediation effect of FeS particles on Cd and Pb

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Embodiment Construction

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but they do not limit the present invention.

[0023] 1. Materials and methods

[0024] 1.1 Experimental materials

[0025] 1.1.1 FeS nanoparticles and phosphate

[0026] The FeS nanoparticle suspension was prepared by adopting the patent of CN 105460979 B "A Preparation and Use Method of FeS Microparticles for Remediating Hexavalent Chromium Contaminated Soil". FeSO used in the preparation process 4 ·7H 2 O and Na 2 S·9H 2 O was purchased from Chongqing Boyi Chemical Reagent Co., Ltd. and Chengdu Kelong Chemical Reagent Factory, respectively, and sodium carboxymethyl cellulose (CMC) was purchased from Shanghai Qiangshun Chemical Reagent Co., Ltd., which was chemically pure; 3 PO 4 ·12H 2 O was purchased from Chongqing Boyi Chemical Reagent Co., Ltd. as analytical grade....

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Abstract

The invention provides a restoration method for Cd-Pb-Cr(VI) composite polluted soil. The remediation method includes the following steps: analyzing the concentrations of Cd, Pb and Cr(VI) in the soil to determine the degree of soil pollution, determining the dosage of FeS nanoparticles and phosphate in the remediation agent, and applying the remediation agent to Cd-Pb- The Cr(VI) composite contaminated soil was subjected to reactive remediation, and then the concentrations of Cd, Pb, and Cr(VI) in the soil leachate after remediation were checked. If the restoration target was not reached, the analysis and restoration were repeated. The remediation method provided by the invention can remediate the Cd-Pb-Cr(VI) composite polluted soil by using a simple ratio of FeS nanoparticles and phosphate. The remediation method has simple steps and strong operability in practical application. The composition of the repairing agent is simple, but the types of heavy metals to be repaired are diverse and targeted, the repairing cycle is short, and the cost of the repairing agent is low.

Description

technical field [0001] The invention belongs to the technical field of soil restoration, in particular to a restoration method for Cd-Pb-Cr(VI) composite polluted soil. Background technique [0002] In recent years, with the implementation of policies such as "retreat the second and enter the third", "retire the city and enter the park" and "industrial transfer", a large number of industrial enterprises have left sites in the city. From the perspective of the pollution types of the site, inorganic pollution, especially heavy metal pollution, is more prominent, and it often presents the characteristics of multiple heavy metal composite pollution. Cadmium (Cd), lead (Pb), and chromium (Cr) three kinds of heavy metal pollution often coexist in metal smelting, chemical manufacturing, electroplating and other industries, and the seriousness of the pollution cannot be ignored, causing serious damage to the environment, ecological safety and human health. Therefore, the remediatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 佘健王婉玉彭聃瞿宏璟聂衍韬叶枫
Owner 中南安全环境技术研究院股份有限公司
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