Method for simultaneous producing and repairing of mild cadmium contaminated soil

A cadmium-contaminated soil, mild technology, applied in the field of phytoremediation of soil heavy metal pollution, can solve the problems of long cycle time, low extraction rate, unacceptable, etc.

Inactive Publication Date: 2019-04-16
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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Problems solved by technology

[0004] However, there are still some difficulties in the practical application of phytoremediation technology, such as the hyperaccumulation plant species of heavy metals are few, the biomass is not large, the extraction rate is not high, and some plants have poor stress resistance in the field growth process. Th

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  • Method for simultaneous producing and repairing of mild cadmium contaminated soil
  • Method for simultaneous producing and repairing of mild cadmium contaminated soil
  • Method for simultaneous producing and repairing of mild cadmium contaminated soil

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[0029] The following are specific examples:

[0030] The above scheme is optimized. In the S1 step, the cadmium-enriched plants include Pokeweed and Bidens, the Pokeweed is planted between February and March each year, and the Bidens is between March and March each year. Planted between April, the planting time of the Bidens is later than the planting time of the Pokeweed. In this embodiment, both Pokeweed and Bidens have the characteristics of large biomass, developed root system and strong stress resistance, wide adaptability to soil, simple planting management method, and good cadmium accumulation effect. In addition, the plant heights of Pokeweed and Bidens are quite different, and there is no spatial competition relationship. Moreover, Bidens can be cut many times a year, which can speed up the treatment of cadmium pollution in the soil. Phytolacca has a higher plant height. Planting it between February and March can ensure that there will be no spatial competition and conf...

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Abstract

The invention relates to the technical field of soil heavy metal pollution phytoremediation, and provides a method for simultaneous producing and repairing of mild cadmium contaminated soil. The method includes the steps of S1, successively sowing a variety of cadmium-rich plants with large plant height differences in the form of intercropping in soil with mild cadmium contamination according to seasons; S2, interplanting cucurbitaceae climbing herbaceous plants with low cadmium enrichment on the cadmium-rich plants, and picking at the time of fruit ripening; S3, timely conducting mowing and stubble remaining on the cadmium-rich plants, and removing all plants in the soil from roots between September and October; S4, detecting the cadmium content of the soil, if not qualified, repeating S1-S3 steps, carrying out the next batch of planting, and if qualified, stopping planting. The cadmium-enriched plants with high plant height differences are sown, the cucurbitaceae climbing herbaceousplants with the low cadmium enrichment is inter-planted thereon, and the above plants can effectively treat cadmium pollution in the soil due to the fact that there is no competition in the growth space, and can also bring economic income.

Description

technical field [0001] The invention relates to the technical field of phytoremediation of soil heavy metal pollution, in particular to a method for production while repairing medium-light cadmium-contaminated soil. Background technique [0002] Soil cadmium pollution is one of the ten serious environmental problems facing society today. In nature, soil cadmium pollution has the characteristics of long decomposition period, high mobility, high toxicity, and refractory degradation. In my country, the cadmium-contaminated area of ​​farmland soil alone has exceeded 20×10 4 hm 2 , the annual production of agricultural products with excessive cadmium content reaches 14.6×10 8 kg. [0003] At present, the commonly used soil cadmium pollution remediation technologies mainly include physical remediation technology, chemical remediation technology and biological remediation technology (phytoremediation and microbial remediation, etc.). Among them, phytoremediation technology can...

Claims

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Application Information

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IPC IPC(8): A01B79/02B09C1/00
CPCA01B79/02B09C1/105B09C2101/00
Inventor 殷志遥冉宇景琪田靓赵颖刘更生
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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