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Stable repairing agent for simultaneously stabilizing arsenic and cadmium polluted soil and preparation method and use method thereof

A cadmium-contaminated soil and repair agent technology, applied in the field of environmental chemistry, can solve the problems of unstable application effect, cumbersome use, high preparation cost, etc., and achieve the effect of increasing structural richness, not easy to deteriorate, and low dosage ratio

Active Publication Date: 2021-12-07
北京润鸣环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Second, the addition of agricultural land restoration materials is usually required to be less than 1% (the addition of agricultural land is usually 0.5%, and the addition of contaminated sites is usually 3%-5%). It is basically reduced by 30%-50%, which makes it very difficult to restore arsenic pollution on agricultural land;
[0009] Arsenic usually exists in the form of oxyanions, while cadmium usually exists in the form of divalent cations. When there are two pollutants of arsenic and cadmium in the soil at the same time, common stabilization repair materials can only stabilize one of them, and the other element Either ineffective, or antagonistic or counterproductive
[0010] At present, there is a lack of economical, safe, applicable, and efficient restoration materials that stabilize arsenic and cadmium at the same time. The existing materials usually cannot stabilize arsenic and cadmium at the same time. At most, it can achieve the reduction of cadmium and the stabilization of arsenic (decrease of cadmium and no increase of arsenic); and the cost of material preparation High, cumbersome to use, unstable application effect, easy to be affected by various factors, resulting in large differences in treatment effect; ultimately it is difficult to realize large-scale application of arsenic and cadmium compound pollution in farmland

Method used

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  • Stable repairing agent for simultaneously stabilizing arsenic and cadmium polluted soil and preparation method and use method thereof
  • Stable repairing agent for simultaneously stabilizing arsenic and cadmium polluted soil and preparation method and use method thereof
  • Stable repairing agent for simultaneously stabilizing arsenic and cadmium polluted soil and preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Use ferrous citrate and steel slag at a mass ratio of 2:1, 1:1, and 1:2 for ball milling to obtain repair agents, which are denoted as 1#, 2#, and 3#.

[0064] The steel slag is from Hebei Chengde Iron and Steel Plant, which is a converter steel slag, and the raw material particle size of the steel slag is less than 2 mm.

[0065] Most of the steel slag in this batch has a particle size of 1-2mm, and 13% of the steel slag is at the level of 100 nanometers after being prepared by ball milling.

experiment example 1

[0067] The soil sample in the embodiment is based on a certain arsenic and cadmium polluted farmland in Zhejiang area, the available arsenic content is 0.506mg / kg, the available cadmium content is 0.124mg / kg, and the soil pH is 5.78; the specific experimental operation is as follows: the experimental farmland area is 4 Each mu of farmland is divided into the control area, the first area, the second area and the third area by the field ridges covered with plastic film, and the soil surface of the farmland to be repaired is evenly sprayed with a kind of organic acid ferric salt. Calcium-silicon-based porous material, the dosage ratio of the first zone, the second zone, and the third zone is set to 0.3%, 0.5% and 1.0% respectively, the soil plowing depth is 20cm, and the soil density is 1.65g / cm 3 Calculated, the amount of restoration materials per mu of farmland is 660kg, 1100kg and 2200kg in turn. The agricultural tiller reciprocates and plows twice to make the restoration mate...

experiment example 2

[0092] Adopt the same method of experimental example 1, adjust restoration agent 2# addition ratio, as shown in table 2, test, the result is as shown in table 2.

[0093] Table 2 Results of different addition ratios

[0094]

[0095] As can be seen from Table 2, under different addition ratios (0.3%, 0.5%, 1.0%), the restoration agent prepared by the present invention increases successively for the reduction ratio of available arsenic and available cadmium in the test soil, but the addition ratio is greater than 0.5 %, the increase is not obvious, so the best addition ratio for the test soil is 0.5%.

[0096] Table 3 shows the comparison of As and Cd contents in the rice planted on the repaired soil with correspondingly adjusted restoration agent 2# addition ratio. As can be seen from Table 3, under different addition ratios (0.3%, 0.5%, 1.0%) of the restorative agent prepared by the present invention, the content of As and Cd in rice decreases significantly, and in the ca...

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Abstract

The invention provides a stable repairing agent for simultaneously stabilizing arsenic and cadmium polluted soil. The stable repairing agent is an organic acid ferric salt modified silicon-calcium-based porous framework adsorption fixing material; the silicon-calcium-based porous frame adsorption fixing material is steel slag. According to the invention, the acidic property of iron in an iron-based material and the alkaline property of a silicon-calcium-based porous framework adsorbing and fixing material are utilized, and after the two substances are mixed according to an optimal proportion, under the condition that a certain proportion of water is added, the two substances generate nascent substances to synergistically act on the two substances, namely arsenic and cadmium, and the obtained soil remediation agent can chemically stabilize arsenic and cadmium pollutants in soil.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, in particular to a stabilizing restoration agent for simultaneously stabilizing arsenic and cadmium polluted soil, a preparation method and a use method thereof. Background technique [0002] Soil stabilization and remediation technology is to add a stabilizing remediation agent to the polluted soil. The remediation agent interacts with the pollutant ions in the soil, and stabilizes them in the soil through precipitation, adsorption, complexation, etc., and is not easy to migrate and transform threats. to human health. [0003] The selection of stabilized restoration agent and the research and development of efficient stabilized restoration agent are the core of the current technology. Efficient, economical, safe, and applicable restoratives are also the main evaluation indicators for current restoratives. [0004] The danger of arsenic and cadmium polluted soil is that enrichme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08Y02P10/20
Inventor 张丽毕学张琢王志新
Owner 北京润鸣环境科技有限公司
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