Technical diagram
Recently, Wu Zhengyan, a researcher at Institute of Bioengineering and Agricultural Engineering, Hefei Institute of Material Science, Chinese Academy of Sciences, developed a new type of remediation agent that efficiently removes heavy metals in water and soil by using abandoned rock wool. This work will promote the circulation of construction waste materials Use, safeguard the environment and food security, the implementation of the strategy of rural rejuvenation is of great significance.The relevant achievements have been published by the Chemical Engineering Journal.
Electroplating, mining and mining and other industrial activities led to regional water and soil chromium pollution, leading to food chromium over the standard often occur, a serious threat to human health, become China's agricultural and environmental issues to be solved the key issues.Currently, usually using nano-iron Reducing agent will be highly toxic hexavalent chromium reduced to low toxicity trivalent chromium, but nano-iron easy to agglomerate seriously affect its reduction efficiency, so often use the carrier material to improve the dispersion of nano-iron.However, these carriers exist in varying degrees of high cost, Complex process, limiting the wide application of the method, become the technical bottleneck in the field of chromium pollution control, the urgent need to develop low-cost, high efficiency carrier material.
Rock wool is a kind of commonly used inorganic building materials, and a large amount of abandoned rock wool is produced in our country each year. Due to the lack of recycling technology, rock wool is usually directly accumulated or buried, which not only occupies a large amount of space but also causes some environmental pollution. A low-cost, efficient and easy treatment, turning waste into treasure to promote the recycling of waste rock wool.
The research group carried out a series of physical and chemical modification on the waste rock wool to prepare a carrier material with a large number of micro and nano pores and functional groups, which can greatly improve the dispersibility of the nano-iron and load the nano-iron to prepare a novel heavy metal remediation agent. The repairing agent can efficiently capture and reduce hexavalent chromium and control its migration, thereby inhibiting crop uptake of chromium and improving food safety.In order to promote its industrial application, the repairing agent is used as a filter element to develop a novel filtration system for chromium The industrial wastewater treatment provides a light and simple solution, which has the advantages of simple process, low cost and reusability, provides an effective technical supply for water and soil heavy metal pollution treatment, and provides a new way for waste rock wool recycling.
The research work was supported by the National Natural Science Foundation of China, the CASS Green Promotion Project, the STS project of the Chinese Academy of Sciences, the key deployment projects of the Chinese Academy of Sciences, the major projects of Anhui Province and the Anhui Provincial Department of Environmental Protection.
