Phytoremediation method for managing composite cadmium-lead-arsenic contaminated soil

A cadmium-contaminated soil and phytoremediation technology, which is applied in the field of phytoremediation of cadmium-lead-arsenic compound-contaminated soil, can solve the problems of low ability to enrich heavy metals, reduce soil fertility, and difficulty in post-processing, and achieve a large bioconcentration coefficient , High absorption and enrichment capacity, strong ability to enrich arsenic, lead and arsenic ions
CN103894401AActive Publication Date: 2014-07-02INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
Publication Date
2014-07-02

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Abstract

The invention provides a phytoremediation method for managing composite cadmium-lead-arsenic contaminated soil. The method comprises the following steps: step S1: selecting a cadmium-enriched castor-oil plant variety; step S2: obtaining cadmium-lead-arsenic composite contaminated soil with neutral acidity and alkalinity; step S3: planting cadmium-enriched castor-oil plants and ciliate desert-grass in an intercropping manner in the cadmium-lead-arsenic composite contaminated soil with neutral acidity and alkalinity for surviving and growth, and harvesting matured castor-oil plants at regular intervals, and carrying out step S5; step S4: harvesting the upper part of the ciliate desert-grass according to the growth height of the ciliate desert-grass, and carrying out the step S5; retaining stubble of the ciliate desert-grass on the soil surface, and carrying out the step S3; step S5: feeding the harvested and matured castor-oil plants and ciliate desert-grass to an exclusive place for concentration and carrying out innocent treatment. The invention further provides a phytoremediation method for managing cadmium contaminated soil. The phytoremediation method is suitable for managing and repairing cadmium-lead-arsenic moderately and slightly contaminated soil, and has good practical application prospect.
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Description

technical field

[0001] The invention relates to the technical field of pollution control, in particular to a phytoremediation method for treating cadmium, lead and arsenic composite polluted soil. Background technique

[0002] At present, with the development of industry and agriculture and the acceleration of urbanization, the phenomenon of soil pollution by heavy metals is relatively common in some parts of my country, especially in some non-ferrous metal mining areas and surrounding areas of smelters. Among them, cadmium (Cd), lead (Pb), arsenic (As) is particularly serious, far exceeding the soil critical value in GB15618-1995 "Soil Environmental Quality Standards" to ensure agricultural and forestry production and normal plant growth. At present, about 25 million hectares of farmland soil is polluted by heavy metals in my country, and as many as 12 million tons of grain are polluted by heavy metals every year, causing direct economic losses of more than 10 billion yuan. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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