Qiu Rongliang: Mine restoration-what path to follow?
Sponsored by the Chinese Academy of Sciences, Chinese Association for science and technology, Ministry of agriculture and the Ministry of environmental protection, undertaken by periodical of Chinese Academy of science and Chinese Ecological Restoration Network, hosted the strategic and decision-making Forum: Security of soil and ecological environment – international soil years locates in China “, this theme activity was successfully held in China Hall of Science and Technology on 11-12 July 2015. Experts gather together to explore the way of remediation of soil pollution in China.
Qiu Rongliang, a professor from college of environmental science and engineering, Zhong Shan University, has made a report on the progress of the remediation of heavy metal contaminated soil in mine and surrounding areas.
Heavy metal pollution on the soil, ecology are hazardous, it’s also a serious problem in human health and food safety. The lead zinc mine is mainly located in the south of China, especially in Guangdong and Yunnan. China’s land occupation by mining, destruction of land is up to 7.43 million hectares. The reclamation rate of mining affected land is only 13.3% nationwide, the reclamation rate mainly comes from coal mine, but metal mine reclamation rate is relatively low.
Metal mining area has the following features of pollution: acidic wastewater accelerated heavy metal pollution, the iron sulfur oxidation reduction process alternately accelerated biological geochemistry circulation, heavy metal biogeochemical activity with “hot spots”. Building up remediation system of heavy metal polluted mine soil has a long way to go, in the system, soil process, root rhizosphere and planting processes will have important effects on soil remediation.
Colloid migration may be an important solution for heavy metal migration in mining area.
The key of mine restoration is to control the source, the development and use of new technology in the process is very important, for instance, the separation of isotopes. At the same time, the study of the ways of heavy metal migration and absorption, and their mechanism should be strengthened.
For the restoration of agricultural mining, in 1983, concept of phytoremediation was proposed. The main idea is to uptake of heavy metals by plant, but the development and improvement in this field is slower than expected, maybe affected by patented. These are the theory foundation for international phytoremediation. For the abandoned mine land, the heavy metals causing pollution can or cannot be seen from the view of resources? At the same time, is it possible to get economic and ecological benefits from some energy plants and economic plants during restoration?