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Composition for conditioning cadmium-polluted selenium-rich soil, and use method and use thereof

A technology of selenium-enriched soil and composition, which is applied in the field of soil pollution control, can solve the problems of reducing the effectiveness of heavy metals, increasing the cost and workload of soil remediation, and limitations, and achieves the goals of low remediation cost, increased organic matter content, and reduced remediation cost Effect

Inactive Publication Date: 2017-09-29
四川省地质调查院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when biochar is used alone, it needs a large amount to effectively reduce the effectiveness of heavy metals, which increases the cost and workload of soil remediation, and limits its application to the treatment of large areas of polluted soil.

Method used

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  • Composition for conditioning cadmium-polluted selenium-rich soil, and use method and use thereof
  • Composition for conditioning cadmium-polluted selenium-rich soil, and use method and use thereof
  • Composition for conditioning cadmium-polluted selenium-rich soil, and use method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The mulberry branches are cleaned centrally to remove soil and gravel, after being dried and coarsely crushed, they are pyrolyzed under anaerobic conditions at 400-600°C to generate biochar, which is pre-crushed by a ball mill. Biochar, bentonite (Santai Guanghua Bentonite Co., Ltd., Sichuan Province) and commercially available calcium magnesium phosphate fertilizer (P 2 o 5 Content 18%, CaO content 40%, water soluble SiO 2 content of 25%, MgO content of 8%) to mix, fully mix and pass through a 100-mesh sieve for later use. According to the actual situation of the soil, the dosage of the composition is 0.25%-0.5% of the weight of the dry soil, and it is mixed into the soil 3-7 days before sowing the paddy rice.

Embodiment 2

[0040] The mulberry branches are cleaned centrally to remove soil and gravel, after being dried and coarsely crushed, they are pyrolyzed under anaerobic conditions at 400-600°C to generate biochar, which is pre-crushed by a ball mill. Biochar, bentonite (Santai Guanghua Bentonite Co., Ltd., Sichuan Province) and commercially available calcium magnesium phosphate fertilizer (P 2 o 5 Content 18%, CaO content 40%, water soluble SiO 2content of 25%, MgO content of 8%) to mix, fully mix and pass through a 100-mesh sieve for later use. According to the actual situation of the soil, the dosage of the composition is 0.5%-1.5% of the weight of the dry soil, and it is mixed into the soil 3-7 days before the rice is sown.

Embodiment 3

[0042] The mulberry branches are cleaned centrally to remove soil and gravel, after being dried and coarsely crushed, they are pyrolyzed under anaerobic conditions at 400-600°C to generate biochar, which is pre-crushed by a ball mill. Biochar, bentonite (Santai Guanghua Bentonite Co., Ltd., Sichuan Province) and commercially available calcium magnesium phosphate fertilizer (P 2 o 5 Content 18%, CaO content 40%, water soluble SiO 2 content of 25%, MgO content of 8%) to mix, fully mix and pass through a 100-mesh sieve for later use. According to the actual situation of the soil, the dosage of the composition is 1%-2% of the weight of the dry soil, and it is mixed into the soil 3-7 days before the rice is sown.

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Abstract

The invention provides a composition for conditioning cadmium-polluted selenium-rich soil, and a use method and an application thereof. The composition comprises biomass carbon, bentonite and a calcium magnesium phosphate fertilizer. The biomass carbon produced from agricultural wastes ramulus mori, bentonite and the calcium magnesium phosphate fertilizer are used to effectively control the activity of cadmium in the soil, reduce the content of cadmium in rice and produce natural selenium-rich rice according with national standards. The composition has the advantages of low preparation cost and environmental protection, and can be practically applied to the remediation and the regulation of the cadmium-polluted selenium-rich soil.

Description

technical field [0001] The invention relates to the technical field of soil pollution control, in particular to a composition for conditioning cadmium-polluted selenium-enriched soil and its application method and purpose. Background technique [0002] With the rapid development of my country's economy, the problem of soil heavy metal pollution is becoming more and more serious, which mainly comes from industrial and agricultural production and transportation. Soil heavy metal pollution has a huge impact on people's production and life. Not only does it directly cause economic losses due to food production reduction, but also heavy metals are transmitted through water, air, plants and other media or food chains and ultimately endanger human health. In my country's heavy metal-polluted soil, cadmium pollution is quite serious. After cadmium enters the human body, it can cause itai disease, kidney failure, damage the nervous system and cause cancer; and selenium, as an essent...

Claims

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Application Information

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IPC IPC(8): C05G3/04C09K17/08C09K101/00C09K109/00C05G3/80
CPCB09C1/08B09C2101/00C05B13/02C05G3/80C09K17/08C09K2101/00C09K2109/00C05D9/00
Inventor 徐志强李忠惠梁斌蒋卉阚泽忠黎诗宏
Owner 四川省地质调查院
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