Method for repairing lead-polychlorinated biphenyl combined polluted soil

Abstract

The invention discloses a method for repairing a lead-polychlorinated biphenyl (Pb-PCBs) combined polluted soil. The method comprises the following steps: utilizing hydrogen peroxide to sterilize the seeds of impatiens balsamina and planting the seeds in seedling growing discs; after the seeds germinate and grow to 5-8cm, transplanting the seeds to the soil polluted by Pb and PCBs; periodically watering so as to keep a proper moisture, and harvesting the whole plants after 120 days so as to carry out appropriate treatment; and finishing a remediation period, repeating the above operations, until the content of Pb-PCBs in the soil lowers to a safety environmental standard. The method provided by the invention has the advantages that the impatiens balsamina has strong adaptability and can resist against cold weather and poor soil, the seeds spilled on the ground can grow automatically and rapidly at proper damp and hot conditions; the culturing management is convenient. Compared with the traditional remediation method of the polluted soil, the remediation method of the soil polluted by Pb and PCBs by utilizing the tolerant flower impatiens balsamina provided by the invention is characterized by low cost, little construction volume, low requirement on techniques and no secondary pollution, and the environment can be beautified during soil remediation.

Description

technical field [0001] The invention relates to a phytoremediation technology for heavy metal-persistent organic matter compound polluted soil, in particular to a method for repairing lead-polychlorinated biphenyl compound polluted soil. technical background [0002] Due to mining, sewage irrigation, etc., the heavy metal pollution in the soil is becoming more and more serious. According to the 2008 China Environmental Statistical Yearbook data, among the 1.4 million hectares of sewage irrigation areas in the country, the area suffering from heavy metal pollution accounts for 64.8%. and moderately polluted area reached 87.0%, see Document 1: National Bureau of Statistics, State Environmental Protection Administration. China Environmental Statistical Yearbook-2008[M]. Beijing: China Statistics Press, 2008. With the rapid development of information technology and the acceleration of the replacement of electronic products, more and more electronic products have been eliminated,...

AI Technical Summary

Problems solved by technology

However, when Pb and persistent organic pollutants exist in combination, there are relatively few studies on whether plants have a repairing effect on heavy metals.

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