Method for restoring soil heavy metal cadmium pollution by use of herba cichorii

Abstract

A method for using chicory to restore heavy metal cadmium-contaminated soil is to plant chicory in the heavy metal-contaminated soil according to its natural growth period and carry out conventional cultivation; through the ability of chicory to absorb and enrich heavy metal cadmium during the natural growth process, remove Excess heavy metal cadmium in soil. Chicory can grow normally in heavy metal-contaminated soil without obvious toxic symptoms and does not affect the yield of chicory; and because of the large biomass of the aboveground parts, it can be cut many times during its growth period and can absorb and accumulate a large amount of various heavy metals. Especially for the heavy metal cadmium content in the plant was significantly higher than the soil background value, reaching the level of enrichment. This method is relatively simple in cultivation, low in management costs, and can benefit for many years from one planting. Chicory has high economic value as a conventional pasture. After simple detoxification treatment, it can prevent heavy metals from re-entering the food chain, and can obtain good quality while controlling pollution. Income.

Description

technical field [0001] The invention relates to a phytoremediation technology for soil polluted by heavy metals, in particular to a method for repairing soil polluted by heavy metal cadmium by using chicory. Background technique [0002] With the development of industry, the intensification of urban pollution and the continuous improvement of agricultural production areas, the pollution of soil by heavy metals and foreign organic compounds is becoming more and more serious. At present, there are different degrees of heavy metal pollution in the soil of various countries in the world. The average annual global emission of Hg is about 15,000 tons, Cu is 3.4 million tons, Pb is 5 million tons, Mn is 15 million tons, and Ni is 1 million tons. Heavy metal pollution can lead to soil degradation, reduce the yield and quality of crops, and enter surface water and groundwater through runoff and leaching along with rainwater and sediment, causing water pollution. Looking at the curre...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to, aiming at the deficiencies in the above-mentioned prior art, provide a kind of method that utilizes chicory to remediate soil heavy metal cadmium pollution, to solve the problems that plants cannot be harvested multiple times, seasonal restrictions, and slow growth in the existing heavy metal-contaminated soil remediation technology , The biomass of the aboveground part is low, the total amount of heavy metals absorbed and accumulated is small, it only has tolerance and enrichment ability for a single heavy metal, it does not have good economic benefits, and the comprehensive effect of practical application is not great, etc.

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