Heavy metal contaminated soil remediation agent and preparing method thereof

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...

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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;

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