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Remediation method for cadmium-nitrate combined pollution of facility agriculture soil

A remediation method and composite pollution technology, which is applied in the field of polluted soil environmental governance, can solve the problems of less remediation methods, and achieve the effects of small engineering volume, improved biodiversity, and simple technical management

Active Publication Date: 2016-06-15
ZHEJIANG UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are still relatively few in-situ heavy metal-contaminated soil remediation methods that do not interrupt agricultural production.

Method used

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  • Remediation method for cadmium-nitrate combined pollution of facility agriculture soil
  • Remediation method for cadmium-nitrate combined pollution of facility agriculture soil

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1. Test location: a vegetable planting base in Hangzhou.

[0039]The plastic greenhouses that have been continuously cultivated for 8 years were selected, and the cadmium content was 1.10 mg / kg, and the nitrate content was 235.2 mg / kg, which exceeded the limit value for farmland in the soil environmental quality standard (GB15618-2008).

[0040] The super-accumulative plant Sedum sedum is provided by our team from the existing plants. The stem section of Sedum sedum is cut into the substrate with a ratio of vermiculite:perlite of 3:1, and the plant height is 5-6cm or about Transplanted into the soil compound polluted by cadmium and nitrate at 1 month.

[0041] The conventional Chinese cabbage is Qibao green vegetable, and the conventional water spinach is Thai willow green water spinach.

[0042] The water spinach and pakchoi varieties with low accumulation of cadmium and nitrate were selected from the existing vegetable varieties of our research group. The standard is...

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Abstract

The invention discloses a remediation method for cadmium-nitrate combined pollution of facility agriculture soil. The remediation method comprises the following steps: (1) planting sedum alfredii hance in soil under remediation, regularly harvesting the sedum alfredii hance, and removing the sedum alfredii hance after harvesting twice or triple; (2) after removing the sedum alfredii hance, planting port-grown green-stem slim-leaf water spinach, and flooding the plants with water during growing; (3) after harvesting the port-grown green-stem slim-leaf water spinach, further planting Siyuebai pakchoi in the soil; and (4) repeating steps (1) to (3) until the soil is up to the standard. According to the remediation method for cadmium-nitrate combined pollution of facility agriculture soil, the rotation manner of a Cd-hyperaccumulator, a cadmium-nitrate low-accumulation aquatic vegetable, and a cadmium-nitrate low-accumulation terraneous vegetable is adopted, and the edible safety of the vegetables is guaranteed while the soil is remediated.

Description

technical field [0001] The invention relates to the technical field of environmental treatment of polluted soil, in particular to a repair method for cadmium-nitrate compound pollution of protected agricultural soil. Background technique [0002] The soil in our country has been seriously polluted by heavy metals, and the polluted area is increasing year by year. The environmental pollution caused by heavy metals has become increasingly prominent, and it is one of the outstanding environmental problems that need to be properly resolved. According to statistics, the cadmium-contaminated area of ​​cultivated land in my country is 100,000 km 2 , and the degree of pollution is serious. Cadmium in the soil will not only affect the metabolic activities such as plant growth and cell division, inhibit the growth of crops, reduce the yield of crops, but also enter the food chain through the soil-crop system, bringing great harm to human health. Cadmium has strong mobility in the so...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 杨肖娥唐琳罗伟君潘风山
Owner ZHEJIANG UNIV
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