CN112457863A

CN112457863A - Heavy metal antimony contaminated soil remediation agent

Info

Publication number: CN112457863A
Application number: CN202011440999.3A
Authority: CN
Inventors: 王勋; 陈佑龙; 于喜和; 杨慧敏; 王祖威
Original assignee: Nanjing Qingke Zhongsheng Environment Technology Co ltd
Current assignee: Nanjing Qingke Zhongsheng Environment Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-03-09

Abstract

The invention discloses a heavy metal antimony contaminated soil remediation agent, which comprises the following components in percentage by mass: 30-50% of clay mineral, 30-50% of iron salt, 5-20% of surfactant and 1-5% of dithiocarbamate derivative. The preparation method is simple and feasible, fully exerts the synergistic effect of the components, reduces the leaching concentration of antimony in the soil through adsorption, chelation, precipitation and PH regulation, has good effect, and has low cost, easy implementation and operation and high safety.

Description

Heavy metal antimony contaminated soil remediation agent

Technical Field

The invention relates to the technical field of soil pollution remediation, in particular to an antimony-polluted soil remediation agent.

Background

Antimony, which is a rare metal of the same family as arsenic, has been increasingly polluting the environment in recent years due to the influence of human activities and the widespread use of antimony compounds. Due to the potential chronic toxicity and proven carcinogenicity of antimony, research on antimony pollution in foreign countries is gaining more and more attention. The U.S. EPA ranks antimony and its compounds as priority control contaminants, which are also a contaminant of close concern in the environmental parlor of Japan, and antimony is listed as hazardous waste in the Basel convention for the definition of the border-crossing migration of hazardous waste. Because China is the world with the largest antimony reserves and antimony ore yields, our country is suffering from environmental pollution caused by antimony ore mining. In addition, with the rapid development of the industries such as printing and dyeing, flame retardants, semiconductor production and the like in China, the using amount of antimony is increased year by year, and the environmental risk and harm brought by antimony pollutants are further increased.

Currently, the domestic technologies of immobilization/stabilization, leaching, soil washing, electrodynamics restoration, chemical reduction, phytoremediation and microorganism restoration for treating the antimony-polluted soil have been widely used in the treatment of heavy metal pollution in soil due to the advantages of mature technology, low cost, simple operation, convenient construction, high efficiency and the like. However, because of the lack of attention to antimony pollution, the effect of treating antimony pollution in the prior art is not obvious, and the invention needs to make up for the deficiencies of the prior art and invents a special remediation agent for treating soil antimony pollution.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a novel cadmium-polluted soil remediation agent.

The purpose of the invention is realized by the following technical scheme:

the heavy metal antimony contaminated soil remediation agent comprises the following components in percentage by mass: 30-50% of clay mineral, 30-50% of iron salt, 5-20% of surfactant and 1-5% of dithiocarbamate derivative.

Preferably, the heavy metal antimony contaminated soil remediation agent consists of the following components in percentage by mass: 30-50% of sepiolite, 30-50% of ferrous sulfate, 5-20% of sodium dodecyl benzene sulfonate and 1-5% of sodium pyrrolidine dithiocarbamate.

The preparation method of the heavy metal antimony contaminated soil remediation agent comprises the following steps: and fully and uniformly mixing the components in percentage by mass to obtain the cadmium-polluted soil remediation agent.

Compared with the prior art, the method of the invention has the following advantages:

(1) the raw materials for preparing the medicament have the characteristics of economy, effectiveness, wide sources, strong stability, simple and easy preparation and no secondary pollution to soil;

(2) the repairing method has simple steps, wide application range and strong applicability;

(3) the solidification stabilization repairing method used by the invention has good stabilization repairing effect on heavy metal antimony polluted soil.

Detailed Description

The present invention is further illustrated by the following specific examples.

Preparation of restorative agent example 1:

the raw materials are fully mixed according to the mass percentage composition shown in the following table 1, and different cadmium-polluted soil remediation agents are prepared.

TABLE 1 formulation composition of various antimony contaminated soil remediation agents

Numbering	Sepiolite	Sodium dodecyl benzene sulfonate	Ferrous sulfate	Pyrrolidinedicarbamic acid sodium salt
					1	45％	10％	40％	5％
2	50％	5％	40％	5％
					3	40％	12％	45％	3％

Embodiment 2 concrete implementation mode and technical effect of heavy metal antimony contaminated soil remediation agent:

30 kg of antimony-contaminated soil is taken from a site left after a certain chemical plant in Chongqing is moved.

(1) The pretreatment of the original soil sample of the polluted soil comprises the following steps: a horizontal oscillation method of a solid waste leaching toxicity leaching method HJ/T557-: HJ 766 and 2015 determination of metal elements in solid waste inductively coupled plasma Mass Spectrometry. The leaching concentration of antimony in the original soil of the polluted soil is 216 ug/L.

(2) 30 kg of antimony-contaminated soil is averagely divided into 3 parts, each part is 10 kg, and the serial numbers of the three parts are 1#, 2#, and 3#, 0.1 kg of the three serial numbers of the agents in the embodiment 1 are respectively extracted, and the remediation agents are respectively and uniformly spread on the surface of the contaminated soil with the same serial number.

(3) The soil to be treated is communicated with the remediation agent spread on the soil to be treated in a stirring way, and is stirred and mixed for more than 3 times to form mixed soil, and water is added to keep the water content of the mixed soil to be about 30 percent (wet without water leaching);

(4) and covering a plastic film on the mixed soil, and maintaining for 3 days to ensure that the remediation agent in the mixed soil fully reacts with the antimony in the heavy metal polluted soil, so as to fully stabilize the soil.

(5) The leaching concentration of antimony in the soil applied in the embodiment 1 is respectively sampled and detected, and the leaching concentration of antimony in the soil meets the requirement of surface water IV in the quality standard of surface water environment (GB 3838-2002).

Table 2 example 1 effect of application of restorative

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. The heavy metal antimony contaminated soil remediation agent is characterized in that: the heavy metal antimony contaminated soil remediation agent comprises the following raw materials in percentage by mass: 30-50% of clay mineral, 30-50% of iron salt, 5-20% of surfactant and 1-5% of dithiocarbamate derivative.

2. The agent for remediating antimony-contaminated soil as recited in claim 1, wherein: the clay mineral is one or more of montmorillonite, kaolinite or sepiolite.

3. The agent for remediating antimony-contaminated soil as recited in claim 1, wherein: the surfactant is one or more of sodium dodecyl benzene sulfonate or sodium dodecyl sulfate.

4. The agent for remediating antimony-contaminated soil as recited in claim 1, wherein: the dithiocarbamate derivative is one or more of pyrrolidine dithiocarbamate or dibenzyl dithiocarbamate.

5. The agent for remediating antimony-contaminated soil as recited in claim 1, wherein: the heavy metal antimony contaminated soil remediation agent comprises the following raw materials in percentage by mass: 30-50% of sepiolite, 30-50% of ferrous sulfate, 5-20% of sodium dodecyl benzene sulfonate and 1-5% of sodium pyrrolidine dithiocarbamate.

6. The preparation method of the heavy metal antimony contaminated soil remediation agent according to claim 1 or 5, wherein: the method comprises the following steps: the cadmium-contaminated soil remediation agent is prepared by uniformly and fully mixing the components in the mass percentage as described in claim 1 or 5.