An integrated restoration method for cadmium-contaminated farmland

Abstract

The invention discloses a cadmium polluted farmland integral repair method. The integral repair method comprises front end treatment, process control process and terminal deep treatment; the front endtreatment is farmland irrigation water purification; the process control process is farmland soil multi-effect cadmium passivation; and the terminal deep treatment is to plant plants in farmlands inslack seasons for plant repair. After integral repair, under the precondition of not adjusting a paddy planting structure, the effective-state content of soil cadmium in paddy planting areas can be reduced by above 25% through three treatment systems of front end treatment, process control process and terminal deep treatment, and the cadmium reducing rate of agricultural products (such as rice) isnot lower than 50%.

Description

technical field [0001] The invention belongs to the field of agricultural pollution control, and in particular relates to a farmland integrated restoration method. Background technique [0002] In 2002, the results of the Ministry of Agriculture's random inspection of rice safety in the national market showed that the most serious excess of lead in rice was 28.4%, followed by 10.3% of cadmium. Hunan is a well-known hometown of non-ferrous metals. From a national perspective, Hunan is a major heavy metal pollution area. According to reports by Guo Zhaohui and others, the area of ​​land polluted by lead, cadmium, copper, arsenic, mercury and other heavy metals in Hunan Province due to non-ferrous metal mining is 28,000 square kilometers, accounting for 13% of the total area of ​​the province. With the rapid development of industry and urbanization in this province, the further deterioration of the soil environment quality in the province has been exacerbated, and Hunan Provin...

AI Technical Summary

Problems solved by technology

Phytoremediation technology has limited treatment effect and cannot completely eliminate heavy metal pollutants from the source

[0004] At present, the traditional farmland restoration technology is relatively simple, either there is secondary pollution, the cost is high, or the treatment effect is limited

Moreover, it is difficult to make cadmium in rice reach the food pollutant limit standard by a single technology, and it is difficult to ensure food safety production. The development of an efficient and green integrated restoration technology has broad market application prospects

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