Compound passivator suitable for heavy metal compound contaminated soil and using method of compound passivator

A compound pollution and passivating agent technology, applied in the field of soil remediation of agricultural land, can solve the problems of poor remediation effect of heavy metal compound pollution, achieve good promotion and application value, reduce activity and mobility, and simple operation

Inactive Publication Date: 2021-03-12
天津华勘环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the repair effect of natural passivation materials on the combined pollution of two or more heavy metals is poor, and the research on the application of compound and modified passivation materials has gradually replaced the research on single passivation materials.

Method used

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  • Compound passivator suitable for heavy metal compound contaminated soil and using method of compound passivator
  • Compound passivator suitable for heavy metal compound contaminated soil and using method of compound passivator
  • Compound passivator suitable for heavy metal compound contaminated soil and using method of compound passivator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The soil used in the experiment is weakly acidic soil, the pH value of the soil is 6.21, the main pollutants are Cd and As, and the pollution concentrations are 2.48mg·kg -1 , 46.3mg·kg -1 . Add the compound passivator of the present invention whose total addition amount is 2.0% of the soil mass into the polluted soil respectively, fully mix the passivator with the soil, keep 70-75% of the saturated water holding capacity in the field, and stabilize and cultivate two After one week, the rice seedlings were transplanted to the polluted soil for cultivation, and the whole growth period was flooded (the soil surface maintained a water level of 3-5cm) for cultivation. The rice was harvested after 120 days, and the content of cadmium and inorganic arsenic in the brown rice was determined.

[0032] Treat without adding passivating agent as blank control (hereinafter represented by CK), set two groups of different control groups T 1 , T 2 , the present embodiment and matche...

Embodiment 2

[0041] The soil used in the experiment is alkaline soil, the soil pH value is 8.04, the main pollutants are Cd and Pb, and the pollution concentrations are 3.86mg·kg -1 , 606mg·kg -1 . Add the compound passivator of the present invention whose total addition amount is 2.0% of the soil mass into the polluted soil respectively, fully mix the passivator with the soil, keep 70-75% of the saturated water holding capacity in the field, and stabilize and cultivate two Sow rapeseed one week later, harvest rapeseed after 35 days of growth, collect edible parts of rapeseed to determine the content of cadmium and lead.

[0042] Treat without adding passivating agent as blank control (hereinafter represented by CK), set two groups of different control groups T 1 , T 2 , the present embodiment and matched group's component and the proportioning of each component are shown in Table 3.

[0043] Table 3 Different Compounding Treatments

[0044]

[0045]

[0046] The determination m...

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Abstract

The invention discloses a compound passivator suitable for heavy metal compound contaminated soil and a using method of the compound passivator, and belongs to the technical field of agricultural landremediation. The compound passivator is prepared from attapulgite or sepiolite, a silane coupling agent, straw, fermented chicken manure and earthworm nutrient soil as main raw materials. The compound passivator specifically comprises the following components by mass percentage: 20%-50% of attapulgite or sepiolite, 1%-5% of a silane coupling agent, 5%-20% of straw, 20%-50% of fermented chicken manure and 20%-50% of earthworm nutrient soil. And the sum of the weight percentages of the components is 100%. When the compound passivator is used, the preparation process is firstly completed, and then the compound passivator is uniformly mixed with soil according to a certain mass ratio. The preparation method of the compound passivator is simple, the cost is low, and the compound passivator hasgood popularization and application value.

Description

technical field [0001] The invention belongs to the field of soil remediation of agricultural land, and in particular relates to a complex passivator suitable for heavy metal complex polluted soil and a use method thereof. Background technique [0002] The National Soil Pollution Survey released in 2014 showed that about 19.4% (about 2.0×10 7 hectares) of cultivated land has the problem of heavy metal pollution. Heavy metals in the soil are persistent, non-deformable, concealed by plants, and non-degradable. They are easily absorbed by plants and cause direct harm to food safety and human health through the biomagnification of the food chain. Heavy metal pollution control technologies include guest (exchange) soil method, solidification / stabilization, soil leaching and flushing, thermal separation, steam extraction, phytoremediation, electric restoration, etc. In-situ remediation (In-situ remediation) is a kind of soil pollution control technology developed to solve the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/80B09C1/08
CPCB09C1/08B09C2101/00C05D9/00C05G3/00C05G3/80C05F3/00C05F11/00
Inventor 刘艺芸白鹤陈志国曹文庆宋景鹏王秀梅邱沙张荣余世磊贾新昆陈泽锋赵信刚
Owner 天津华勘环保科技有限公司
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