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Silicon-rich soil conditioner for treating cadmium-arsenic compound contaminated soil, and preparation method and application method thereof

A soil conditioner and compound pollution technology, applied in the field of silicon-rich soil conditioner and preparation, can solve the problems of few soil passivator or conditioner materials, increasing the bioavailability of As in soil, and high risk of secondary pollution, To achieve the effect of solving the harmless treatment of chaff, the production and preparation process is simple, and the production method is simple and easy to implement

Active Publication Date: 2020-09-01
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of these materials consumes mineral resources, has a high risk of secondary pollution, and cannot be used in excess, which is not conducive to the improvement of soil quality;
[0005] Second, currently a large number of soil passivation or conditioner materials are only aimed at the remediation and treatment of single heavy metal contaminated soil, and there are few soil passivator or conditioner materials for compound pollution of Cd and As
This leads to in-situ passivation materials that can remediate Cd-contaminated soils may not be able to remediate As-contaminated soils. For example, soil conditioners that remediate heavy metals such as Pb, Cd, Cu, and Zn can generally significantly increase soil pH, but Raising will increase the bioavailability of As in soil

Method used

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  • Silicon-rich soil conditioner for treating cadmium-arsenic compound contaminated soil, and preparation method and application method thereof
  • Silicon-rich soil conditioner for treating cadmium-arsenic compound contaminated soil, and preparation method and application method thereof
  • Silicon-rich soil conditioner for treating cadmium-arsenic compound contaminated soil, and preparation method and application method thereof

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Experimental program
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preparation example Construction

[0028] 1. Preparation of silicon-rich soil conditioner:

[0029] (1) Preparation of rice husk powder: The remaining rice husks processed by a rice mill in a village in Liuyang City, Hunan Province were taken, and the contents of heavy metals Pb, Cd, Cr, As, and Hg in the rice husks were less than 5 mg / kg. Manually remove impurities, then be pulverized into grain husk powder with a particle size range of 20 objects with a pulverizer;

[0030] (2) Initial combustion of chaff powder: evenly spread the crushed chaff powder on the combustion board, the thickness of the chaff powder is 1.0cm; then put it in the combustion furnace for aerobic initial combustion, and the temperature of the combustion furnace is controlled at 200°C± 5°C, air velocity 0.5m 3 / s, with 21% oxygen saturation, burn for 0.5h under aerobic conditions until there is no black smoke;

[0031] (3) Final combustion of chaff flour: the combustion furnace continues to heat up to 600°C±5°C at a rate of 15°C / min, an...

Embodiment 1

[0050] Embodiment 1: Using the silicon-rich soil conditioner of the present invention to plant rice variety Huanghuazhan

[0051] After the rice is mature, the rice plants and the corresponding rhizosphere soil are collected, and relevant indicators are measured and analyzed. It can be seen from Table 3 that the application of silicon-rich conditioner affected the physical and chemical properties of rice Huanghuazhan rhizosphere soil. Rice Huanghua accounted for a slight increase in rhizosphere soil pH, an increase of 0.03 units, but the difference was not significant; soil organic matter decreased significantly by 13.7%; soil available Si content significantly increased by 38.9%. Compared with the control group, after applying the silicon-rich soil conditioner, the content of Cd and As in different extraction states of the rhizosphere soil of rice Huanghuazhan decreased, and the rhizosphere soil CaCl 2 -Cd, HOAc-Cd, TCLP-Cd content decreased significantly, decreased by 18.5%...

Embodiment 2

[0060] Embodiment 2: Adopting the silicon-rich soil conditioner of the present invention to plant rice variety Xiangwanxian No. 13

[0061] After the rice is mature, the rice plants and the corresponding rhizosphere soil are collected, and relevant indicators are measured and analyzed. It can be seen from Table 6 that the application of silicon-rich conditioner affected the physical and chemical properties of the rhizosphere soil of rice Xianglate Xian 13. Compared with the control group, the pH of the rice rhizosphere soil increased slightly by 0.22 units, which was significantly different from the control group; the soil organic matter decreased significantly by 14.0%, while the soil available Si content increased significantly by 26.7%. Compared with the control group, the application of silicon-rich soil conditioner decreased the three kinds of extractable and exchangeable As contents of rice rhizosphere soil Cd, soil CaCl 2 -Cd, HOAc-Cd, and TCLP-Cd content decreased by ...

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Abstract

The invention discloses a preparation method of a silicon-rich soil conditioner for treating cadmium-arsenic combined pollution soil. The preparation method comprises the following steps: (1) removingimpurities from rice husks, and crushing the rice husks into husk powder; (2) putting the crushed rice husk powder into a combustion furnace, and carrying out aerobic primary combustion until no black smoke exists; (3) continuously combusting the rice husk powder under an aerobic condition, naturally cooling to obtain grey white rice husk ash without black impurities, and grinding and sieving therice husk ash to obtain rice husk ash with the particle size range of 40-100 meshes; (4) stirring and mixing nitric acid and rice husk ash, carrying out acid modification and ash removal at room temperature, after stirring is finished, filtering the obtained leaching solution by virtue of a 200-mesh sieve, and reserving a solid; and (5) washing the rice husk ash with deionized water for multipletimes until the pH value of the solution is 6.5-7.5, and drying at 60-80 DEG C until the weight is constant. The problems that synchronous passivation of Cd and As in the Cd and As compound contaminated soil is difficult to realize, and the contents of Cd and As in rice are synchronously reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration and management and agricultural product quality and safety, and specifically relates to a silicon-rich soil conditioner for the treatment of cadmium-arsenic compound polluted soil, a preparation method and an application method. Background technique [0002] Due to the impact of mining, smelting, and the application of heavy metal-containing pesticides and fertilizers, rice fields are seriously polluted by heavy metals. However, heavy metals are non-degradable and last for a long time, making it difficult to naturally eliminate or reduce them from the environment. Rice has a strong ability to accumulate heavy metals such as Cd and As. The continuous accumulation of heavy metals in paddy soil not only hinders the healthy growth of rice, but more seriously endangers human health through the food chain. At present, the complex pollution of soil by heavy metals is becoming more and m...

Claims

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Application Information

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IPC IPC(8): C09K17/02C09K17/04A01B79/02C09K101/00C09K109/00
CPCC09K17/02C09K17/04A01B79/02C09K2101/00C09K2109/00
Inventor 辜娇峰廖柏寒周航刘雅
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY