Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof

A technology for in-situ remediation and polluted soil, applied in the restoration of polluted soil, etc., can solve the problem of insufficient understanding of the stability of the remediation effect of passivation materials and environmental safety, the lack of outstanding effect of multi-element composite pollution treatment, and the impact on soil physical and chemical properties. properties and other issues, to achieve good passivation repair effect, small impact on soil physicochemical properties and fertility, and easy social acceptance.

Inactive Publication Date: 2010-03-10
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing passivation materials are mainly P-containing substances, lime and organic materials, etc., and the application amount is large, resulting in high cost, and may affect the physical and chemical properties of the soil, reducing soil fertility; in the restoration process, often single heavy metal The pollution effect is remarkable, but the treatment effect on multi-element compound pollution is not outstanding; there is a lack of research data from multi-season experiments and field experiments, and insufficient understanding of the stability of the remediation effect of passivation materials and environmental safety
These problems limit the popularization and application of in-situ passivation remediation in soil heavy metal pollution control.

Method used

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  • Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof
  • Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof
  • Passivation material for in-situ restoration of soil polluted by heavy metal, and preparation and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation and use of passivation materials

[0029] Adjust the pH of the aqueous solution of cetyltrimethylammonium bromide (CTMABr) to 11.0-11.3. with 25% tetramethylammonium hydroxide (TMAOH), and stir for 10 minutes. Under the conditions of continued stirring and room temperature, add ethyl orthosilicate (TEOS) to the above solution. The molar ratio of the above raw material reaction is: n(TEOS): n(TMAOH): n(CTMABr): n(H 2 O)=1.0:0.36:0.24:110. The gel formed by the reaction is placed at room temperature for 24 hours, then the upper layer solution is discarded, the solid product is filtered, washed 4 times, dried in an air stream for 2 hours (120°C), and then calcined in a muffle furnace at 550°C for 4 hours, that is The finished product can be obtained.

[0030] When the passivation material is used, according to the specific soil pollution, 0.45% to 0.9% of the dry soil weight is applied to the soil. Considering that the passivation material is in full co...

Embodiment 2

[0031] Example 2: In-situ passivation to repair alkaline contaminated soil

[0032] The test soil was collected from the suburbs of Tianjin, with a pH of 8.18, which was alkaline. The concentrations of exogenous heavy metals in the soil are: Cd-5mg / kg, Pb-600mg / kg, Cu-200mg / kg. Add passivation materials with mass ratios of 0, 0.15%, 0.30%, 0.45% to the soil, and add a certain amount of urea and potassium dihydrogen phosphate as base fertilizer, mix them thoroughly, and put them into plastic pots. Load 1.5 kg of soil, and repeat each treatment 3 times. Sow rapeseed after 2 weeks of aging and irrigate with deionized water daily to keep the soil moisture at about 60% of the field water holding capacity. The rapeseed was harvested and sampled after 60 days of growth, digested with nitric acid-perchloric acid, atomic absorption spectrophotometry was used to determine the content of Cd, Pb, and Cu in plant samples, and the continuous extraction analysis method (BCR) recommended by th...

Embodiment 3

[0037] Example 3: In-situ passivation to repair acid contaminated soil

[0038] The test soil was collected from Jiaxing, Zhejiang, with a pH of 6.08, which was acidic. The concentrations of exogenous heavy metals in the soil are: Cd-5mg / kg, Pb-600mg / kg, Cu-200mg / kg. Add passivation materials with mass ratios of 0, 0.15%, 0.30%, 0.45% to the soil respectively, and add 0.48g urea, 0.23g sodium dihydrogen phosphate and 0.25g potassium sulfate as base fertilizer, mix well, and load In plastic pots, each pot contains 1.5 kg of soil, and each treatment is repeated 3 times. Sow rapeseed after one month of aging and irrigate with deionized water daily to keep the soil moisture at about 60% of the field water holding capacity. Rape was harvested and sampled after 50 days of growth, digested by nitric acid-perchloric acid method, and atomic absorption spectrophotometry was used to determine the content of Cd, Pb, and Cu in plant samples.

[0039] The content of heavy metals in the shoots...

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Abstract

The invention relates to a technique for treating and restoring soil polluted by heavy metal, in particular to a passivation material for in-situ restoration of soil polluted by heavy metal and a usemethod thereof. The material can be prepared by the following steps: mixing tetramethylammonium hydroxide, cetyl trimethyl ammonium bromide, ethyl orthosilicate and water for reaction according to a mole ratio of (0.3-0.4): (0.2-0.3): 1:(100-120) to obtain a gel, placing the gel for 24 hours at a room temperature, filtering and washing solid product for many times, drying at 100-140 DEG C for 2-4hours and then baking at 500-600 DEG C for 4-8 hours to obtain the finished product. The passivation material can be applied into soil according to a proportion of 0.45-0.9 percent of the weight of dry soil and evenly mixed according to the specific pollution condition of the soil. The passivation restoring material prepared in the invention has the advantages of simple production process, capability of fixing multiple heavy metals, favorable restoring effect, wide application range, and the like, has little user amount, does not influence the physiochemical property of soil and can not causesecondary pollution.

Description

Technical field [0001] The invention relates to a treatment and restoration technology for soil heavy metal pollution, in particular to a passivation material for in-situ restoration of heavy metal contaminated soil and a preparation and use method thereof. Background technique [0002] Due to the discharge of industrial "three wastes" and unreasonable agricultural production activities, heavy metal pollution in the soil environment in our country has become increasingly serious. According to statistics, nearly 20 million hectares of arable land in my country are polluted by heavy metals such as cadmium, arsenic, and lead, accounting for about one-fifth of the total arable land; my country’s annual grain production is reduced by more than 10 million tons due to heavy metal pollution, and grain contaminated by heavy metals There are also as many as 12 million tons per year, resulting in a total economic loss of at least 20 billion yuan. Heavy metal pollutants generally have strong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 徐应明王林梁学峰孙扬秦旭
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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