Methods to remediate soil heavy metal pollution

A technology for remediating soil and heavy metals, applied in the field of soil remediation, can solve problems such as hindering plant growth and development, pollution, and limited application range, and achieve the effect of enriching the ratio of elements, improving the excessive content of heavy metals, and improving the waste of agricultural soil

Active Publication Date: 2021-03-02
JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

② Elements required for normal growth and development of plants, and have certain physiological functions for the human body, such as copper, zinc, etc., but too much will cause pollution and hinder plant growth and development
However, the inventive method can only passivate three heavy metal pollutants of cadmium, arsenic and lead, but has no corresponding passivation effect on heavy metals such as mercury, copper, chromium, nickel and manganese, and it can only be applied to moderate and mild Remediation of heavy metal contaminated soil, its application range is limited

Method used

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  • Methods to remediate soil heavy metal pollution
  • Methods to remediate soil heavy metal pollution
  • Methods to remediate soil heavy metal pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1: A heavy metal contaminated soil remediation agent:

[0082] The present embodiment provides a heavy metal contaminated soil remediation agent, and the remediation agent includes:

[0083] a soil conditioning precursor consisting of magnetic polyvinyl alcohol microspheres, iron-magnesium calamus charcoal, and bentonite / polyvinyl alcohol composite resin in a weight ratio of 1:4.5:1.5; and

[0084] A binder composition consisting of bentonite and starch;

[0085] Wherein, the magnetization of the magnetic polyvinyl alcohol microspheres is not less than 2.5A m 2 / kg.

[0086] The heavy metal contaminated soil remediation agent is prepared through a method comprising the following steps.

[0087] 1) Preparation of magnetic polyvinyl alcohol microspheres:

[0088] 1.1) 0.4 parts by weight of gelatin is completely dissolved in sufficient distilled water at room temperature;

[0089] 1.2) 0.5 parts by weight of benzoyl peroxide, 10 parts by weight of liquid wax,...

Embodiment 2

[0109] Example 2: Another heavy metal contaminated soil remediation agent:

[0110] This embodiment provides another heavy metal-contaminated soil remediation agent, whose components, proportions and preparation methods are basically the same as those in embodiment 1, the only difference is that the soil conditioning precursor of this embodiment does not contain magnetic polyethylene Alcohol microspheres.

Embodiment 3

[0111] Example 3: Another heavy metal contaminated soil remediation agent:

[0112] This embodiment provides another heavy metal-contaminated soil remediation agent, and its components, proportions and preparation methods are basically the same as those in embodiment 1, the only difference is that the soil conditioning precursor of this embodiment does not contain iron-magnesium calamus carbon.

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Abstract

The present invention relates to the technical field of soil remediation, in particular to a method for remediating heavy metal pollution in soil. The present invention firstly provides a magnetic polyvinyl alcohol microsphere and iron-magnesium calamus charcoal with a weight ratio of 1.0:3.0-5.0:1.5-3.0 A heavy metal soil pollution remediation agent composed of bentonite / polyvinyl alcohol composite resin as a soil conditioning precursor and a binder component; apply the remediation agent to the surface of heavy metal-contaminated soil and mix it evenly, spray water slightly and maintain it to complete Remediation of heavy metal contaminated soil. The restoration agent can efficiently repair heavy, medium and light heavy metal polluted soil, complete the passivation and degradation of heavy metal elements such as cadmium, arsenic, lead, mercury, copper, chromium, nickel and manganese in the soil, and can also Improve soil water retention capacity, increase soil moisture, enhance soil quality, passivate and degrade slow release of heavy metal elements, prolong action time, and reduce costs.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a method for remediating soil heavy metal pollution. Background technique [0002] Heavy metals are more prominent among soil inorganic pollutants, mainly because heavy metals cannot be decomposed by soil microorganisms, but are easy to accumulate and convert into more toxic methyl compounds, and some even accumulate in the human body at harmful concentrations through the food chain, causing serious harm. Human health. Soil heavy metal pollutants mainly include mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc, etc. Although arsenic is not a heavy metal, its behavior, source and harm are similar to heavy metals, so it is usually listed in Heavy metals are discussed. As far as the needs of plants are concerned, metal elements can be divided into two categories: 1. Elements that are not needed for plant growth and development, but are more ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/00B09C1/08C05G3/80C05G3/00C05G3/70C09K101/00
CPCB09C1/00B09C1/08B09C2101/00C05D5/00C05G3/00C09K17/40C09K2101/00C05G3/70C05G3/80C05D9/00C05D9/02C05F11/00
Inventor 杨金生
Owner JIANGSU GAIYA ENVIRONMENTAL SCI & TECH CO LTD
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