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Strengthened hyperaccumulation phytoremediation technology for arsenic and cadmium heavy metal polluted soil

A technology for hyper-accumulation of plants and polluted soil, applied in the field of environmental protection and ecological restoration, can solve the problem of high cost, achieve the effects of low cost, large amount of interception, and low requirements for planting technology

Inactive Publication Date: 2018-01-19
湖南景翌湘台环保高新技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heavy metal curing agent effectively solidifies the heavy metals in the soil without causing soil compaction, without secondary pollution, but peat is a non-renewable resource and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The arsenic and cadmium slag polluted site in Xiangxiang City, Hunan Province left the soil with arsenic concentrations of 52.6 mg / KG and cadmium 6.8 mg / KG, which are moderately polluted.

[0029] In the arsenic and cadmium slag polluted site left in Xiangxiang City, Hunan Province, after ploughing for 10-25 cm, add 5 kg of stabilizer per cubic meter of heavy metal contaminated soil, add water, and maintain it for 5 days under natural conditions. The pH value of the soil Between 6.8 and 7.5. Wherein, in the stabilizer, the proportion of lime, sepiolite and calcium dihydrogen phosphate is 40%:50%:10% by weight.

[0030] In March, vetiver grass was planted, and the planting density was determined to be 15cm in plant spacing and 100cm in row spacing. Apply organic matter as base fertilizer when planting, 1000m 2 Apply 50kg, topdressing 1-2 times after the vetiver is colonized and survived or during the period of vigorous growth, with urea as topdressing, 1000 m 2 Admini...

Embodiment 2

[0036] In an arsenic and cadmium contaminated site in Xiangtan County, Hunan, the concentration of arsenic in the soil was 31.8 mg / KG and cadmium was 2.5 mg / KG, which was considered to be moderately polluted.

[0037] In the arsenic and cadmium slag polluted site left in Xiangxiang City, Hunan Province, after ploughing for 10-25 cm, add 3 kg of stabilizer per cubic meter of heavy metal contaminated soil, add water, and maintain it for 20 days under natural conditions. The pH value of the soil Between 6.8 and 7.5. Among the stabilizers, the proportion of lime, sepiolite and calcium dihydrogen phosphate is 50%: 45%: 5% by weight.

[0038]In March, vetiver grass was planted, and the planting density was determined to be 15cm in plant spacing and 100cm in row spacing. Apply organic matter as base fertilizer when planting, 1000m 2 Apply 50kg, topdressing 1-2 times after the vetiver is colonized and survived or during the period of vigorous growth, with urea as topdressing, 1000 m...

Embodiment 3

[0044] The arsenic and cadmium slag polluted site in Xiangxiang City, Hunan Province left the soil with arsenic concentrations of 52.6 mg / KG and cadmium 6.8 mg / KG, which are moderately polluted.

[0045] In the arsenic and cadmium slag contaminated site in Xiangxiang City, Hunan Province, after ploughing for 10-25 cm, add 5 kg of stabilizer per cubic meter of heavy metal contaminated soil, add water, and maintain it for 10 days under natural conditions. The value is between 6.8 and 7.5. Among the stabilizers, by weight, lime 40%, sepiolite 30%, calcium dihydrogen phosphate 8%, humic acid 10%, zeolite 1%, bentonite 1%, trimercapto-s-triazine 10%.

[0046] In March, vetiver was planted, and the planting density was determined to be 20cm in plant spacing and 110cm in row spacing. Apply organic matter as base fertilizer during planting, 1000 m 2 Apply 50kg, topdressing 1-2 times after vetiver colonization or during the period of vigorous growth, with monoammonium phosphate as to...

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Abstract

The invention provides a strengthened hyperaccumulation phytoremediation technology for arsenic and cadmium heavy metal polluted soil. The technology comprises stabilization repairing and ecological repairing. In the stabilization repairing process, after an upper layer of to-be-repaired heavy metal polluted soil and a stabilizer are evenly stirred, water is added for irrigation, and curing is conducted under the nature condition, wherein the stabilizer comprises, by weight, 40-60 parts of lime, 30-50 parts of sepiolite and 5-10 parts of monocalcium phosphate. In the ecological repairing process, vetiver grass is planted in cured soil subjected to stabilizer treatment. According to the technology, the nutrient condition, the pH value and the redox potential of the heavy metal polluted soilare adjusted in the stabilization repairing process, and the mobility of the heavy metal is cured; the vetiver grass and other plants are used for conducting enrichment absorption on heavy metal, andthe plant root system is used for conducting stable curing on the heavy metal; and safe and efficient arsenic and cadmium heavy metal polluted soil is achieved through combination of the two above processes, and the repairing cost is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and ecological restoration, in particular to an enhanced hyperaccumulation phytoremediation technology for arsenic and cadmium heavy metal polluted soil. Background technique [0002] In April 2014, the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that 16.1% of the country's total soil sites exceeded the standard, of which 19.4% of the cultivated soil sites exceeded the standard. In June 2015, the "China Cultivated Land Geochemical Survey Report" issued by the China Geological Survey) showed that the proportion of heavy metals in medium-severe pollution or exceeding the standard accounted for 2.5%, covering an area of ​​34.88 million mu; The proportion of the site accounts for 5.7%, covering an area of ​​78.99 million mu. From a regional point of view, the range of soil heavy metals exce...

Claims

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Application Information

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IPC IPC(8): B09C1/10
Inventor 邹灵峰刘宜德
Owner 湖南景翌湘台环保高新技术开发有限公司
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