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Method for repairing cadmium contaminated soil through compound soil repair agent

A soil remediation agent and a technology for cadmium-contaminated soil, which is applied in the field of remediation of cadmium-contaminated soil by a composite soil remediation agent, can solve the problems of unstable remediation effect of single activated carbon, poor remediation effect, strong ability and the like, and achieves low synthesis and transportation costs, Low-cost, wide-ranging effects

Active Publication Date: 2019-11-08
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of unstable repair effect, poor repair effect and strong ability of rice roots to absorb cadmium in the existing single activated carbon, the present invention provides a method for repairing cadmium-contaminated soil by using a composite soil repair agent

Method used

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  • Method for repairing cadmium contaminated soil through compound soil repair agent
  • Method for repairing cadmium contaminated soil through compound soil repair agent
  • Method for repairing cadmium contaminated soil through compound soil repair agent

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Embodiment 1

[0040] A method for synergistically repairing cadmium-contaminated soil using hydroxyapatite-calcium silicate hydrate and biochar, comprising the following steps:

[0041] (1) Preparation of composite soil remediation agent

[0042] (a) Preparation of hydroxyapatite-calcium silicate composite material:

[0043] Dissolve 6g of calcium chloride in 60ml of water to obtain a calcium chloride solution;

[0044] 5g of sodium silicate was dissolved in 50ml of water to obtain sodium silicate solution;

[0045] The resulting calcium chloride solution was slowly added dropwise to the sodium silicate solution under ultrasonic conditions, resulting in a white sol that gradually hardened and was sampled, taken out and incubated in a plastic container at room temperature for 24 hours. In order to remove free calcium hydroxide, wash and filter with deionized water after the reaction, and finally dry at 80°C for 24 hours to obtain calcium silicate hydrate. The scanning electron microscope pic...

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Abstract

The invention provides a method for repairing cadmium contaminated soil through a compound soil repair agent. The method comprises the following steps that the compound soil repair agent is prepared firstly, then the compound soil repair agent and the cadmium contaminated soil are evenly mixed, finally, rice seedling is planted, the soil moisture content is maintained to be 50%-80%, the repairingtime is the overall growing period of rice, the compound soil repair agent is prepared from hydroxylapatite-calcium silicate composite and biochar with the mass ratio being (1:9) to (9:1), the addingamount accounts for 5wt% of the total soil mass of repaired soil, optimally, the mass ratio of the hydroxylapatite-calcium silicate composite to the biochar is (1:9) to (4:6), the more optimal ratio of the hydroxylapatite-calcium silicate composite to the biochar is 4:6, the hydroxylapatite-calcium silicate composite and the biochar act synergistically, in the short period-repairing for 7 days, the compound repair agent can effectively decrease the cadmium content in soil, meanwhile, the cadmium in the soil is converted from the active form to the stable form, bio-availability is effectively lowered, after the rice grows for 152 days, the cadmium metal content in the root and stem of the rice is significantly decreased, and absorbing of the rice to cadmium in the soil is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating cadmium-contaminated soil by using a composite soil remediation agent of hydroxyapatite-calcium silicate composite material and biochar to inhibit rice from absorbing cadmium in the soil. Background technique [0002] Soil heavy metal pollution is one of the most widely polluted and most harmful environmental problems in today's environmental pollution. Heavy metals in soil have attracted much attention because of their poor mobility, long-term retention, and difficulty in being degraded. Metal cadmium is considered to be a very dangerous environmental pollution element. Elemental cadmium cannot exist stably in nature, and it mainly exists in sulfur cadmium ore and zinc ore. Since the beginning of the 20th century, since cadmium and its compounds have been widely used in the manufacture of nickel-cadmium batteries, pigments, alloys, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/12
CPCB09C1/08B09C1/085C09K17/12B09C2101/00
Inventor 袁兴中彭叶琼蒋龙波熊婷姚赛杨羽茜陈鸿鹄
Owner HUNAN UNIV
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