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A kind of heavy metal polluted soil remediation agent and preparation method thereof

A technology for polluted soil and heavy metals, which is applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc. The effect of secondary pollution, easy large-scale promotion, and increased soil fertility

Active Publication Date: 2016-06-22
DALIAN DEETOP ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above heavy metal repair techniques all have a certain effect on heavy metal repair, but they also have their own shortcomings in practical applications.
Phytoremediation technology has limited types of plants for remediation, and its repair speed is slow, and the reprocessing of plants that accumulate a large amount of heavy metals is also the main factor that limits the large-scale promotion of phytoremediation technology; microbial remediation technology generally only adsorbs a single heavy metal. The effect is good, and because the microbial organisms are small, the amount of heavy metals repaired is also small, so this also limits the application of using microorganisms for large-scale on-site repair; the electrodynamic repair technology is still in the experimental research stage, and due to different soil Different physical and chemical properties also have a series of limiting factors in practical application; soil leaching technology is complex and expensive;

Method used

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  • A kind of heavy metal polluted soil remediation agent and preparation method thereof
  • A kind of heavy metal polluted soil remediation agent and preparation method thereof
  • A kind of heavy metal polluted soil remediation agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A heavy metal-contaminated soil remediation agent, the formula ratio is as follows in parts by weight: 50 parts of papermaking sludge, 5 parts of quicklime, 1 part of bentonite ion exchanger, 0.1 part of chitosan and chitosan derivatives;

[0031] After the above raw materials are fully mixed.

[0032] The bentonite ion exchanger is sodium bentonite.

[0033] The chitosan and chitosan derivatives are specifically cationic chitosan.

[0034] The preparation method of described heavy metal polluted soil remediation agent, comprises the following steps:

[0035] (1) Addition of auxiliary materials: take the papermaking sludge with a humidity of 50%, add auxiliary materials in it, and the mass ratio of the added materials is auxiliary materials: sludge dry mass 1:10;

[0036] (2) Earthworm inoculation: take the papermaking sludge added with auxiliary materials, and inoculate it with earthworms, the inoculation amount is earthworms: sludge absolute dry mass 1:40; at an amb...

Embodiment 2

[0040] A heavy metal polluted soil remediation agent, the formula ratio is as follows in parts by weight: 90 parts of papermaking sludge, 30 parts of quicklime, 20 parts of bentonite ion exchanger, 1 part of chitosan and chitosan derivatives;

[0041] After the above raw materials are fully mixed.

[0042] The bentonite ion exchanger is sodium bentonite.

[0043] The chitosan and chitosan derivatives are specifically a mixture of chitosan and carboxymethyl chitosan.

[0044] The preparation method of described heavy metal polluted soil remediation agent, comprises the following steps:

[0045] (1) Addition of auxiliary materials: Take the papermaking sludge with a humidity of 80%, add auxiliary materials to it, and the mass ratio of the added materials is auxiliary materials: sludge dry mass 1:40;

[0046] (2) Earthworm inoculation: take the papermaking sludge after adding auxiliary materials, and inoculate it with earthworms, the inoculation amount is earthworm: sludge abso...

Embodiment 3

[0050] A heavy metal polluted soil remediation agent, the formula ratio is as follows in parts by weight: 80 parts of papermaking sludge, 28 parts of quicklime, 7 parts of bentonite ion exchanger, 0.5 parts of chitosan and chitosan derivatives;

[0051] After the above raw materials are fully mixed.

[0052] The bentonite ion exchanger is sodium bentonite.

[0053] The chitosan and chitosan derivatives are specifically zwitterionic chitosan.

[0054] The preparation method of described heavy metal polluted soil remediation agent, comprises the following steps:

[0055] (1) Addition of auxiliary materials: take papermaking sludge with a humidity of 75%, add auxiliary materials to it, and the mass ratio of added auxiliary materials: sludge dry mass is 1:25;

[0056] (2) Earthworm inoculation: take the papermaking sludge added with auxiliary materials, and inoculate it with earthworms, the inoculation amount is earthworm: sludge absolute dry mass 1:80; at an ambient temperature...

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Abstract

The invention relates to a heavy metal contaminated soil remediation agent and a preparing method thereof, and belongs to the field of soil pollution abatement in environment protection. The heavy metal contaminated soil remediation agent is mainly composed of papermaking sludge, quick lime, sodium bentonite and other bentonite ion exchangers, chitosan and chitosan derivatives. The soil remediation agent is added to soil which is polluted by heavy metal in a proportion of 1:25-50 (remediation agent / soil oven dry mass), so that the content of exchangeable heavy metal which seriously pollutes the environment in the soil is lowered by 30%-70%, and the soil fertility is increased. The heavy metal contaminated soil remediation agent has the advantages of being low in cost, simple in operation, good in use effect, easy to popularize in large scale, and capable of not causing secondary pollution.

Description

technical field [0001] The invention relates to a heavy metal-contaminated soil remediation agent and a preparation method thereof, in particular to a heavy metal-contaminated soil remediation agent using papermaking sludge as a main raw material and a preparation method thereof, belonging to the field of soil pollution control in environmental protection. Background technique [0002] With the continuous development of the global economy, soil heavy metal pollution has become a major problem facing the global environmental quality. The world's average annual emission of Hg is about 15,000 tons, Ni is 1 million tons, Cu is 3.4 million tons, and Pb is 5 million tons. Mn is 15 million t. The area of ​​cultivated land polluted by heavy metals such as Cd, As, Pb, Cr, Hg in my country is 26.67 million hm 2 , accounting for about 1 / 5 of the total cultivated land in the country, of which 11.33 million hm of cultivated land was polluted by Cd 2 , involving 25 regions in 11 provinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08
Inventor 龙柱李恒冯群策
Owner DALIAN DEETOP ENVIRONMENTAL TECH CO LTD