作者机构：
Hunan Research Institute of Nonferrous Metals, 410015, Changsha, China;College of Resources and Environment, Hunan Agricultural University, 410015, Changsha, China;Nanjing Agricultural University, 210095, Nanjing, China
会议名称：
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
会议时间：
2011-09-18
会议地点：
长沙
会议论文集名称：
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)论文集
摘要：
A complex copper-lead-zinc dressing of wastewater has a complicated composition. A variety of heavy metal ions are out of limits and a rich variety of residual mineral processing reagents. COD and pH index are over-standard. Direct recycling of dressing wastewater has a great influence on the dressing indexes. And direct emission has a serious contamination effect on the environment. Due to the characteristics of dressing of wastewater and the requirements of mineral processing, experiment adopted the following process to dispose the dressing wastewater-" coagulation precipitateC102 oxidation-aeration-adjustable pH-clarifying". Quality of processing water reached primary standard in the integrated wastewater discharge. Then dressing wastewater by the use of mineral processing reagents and the optimization of dressing process was successfully reused and without discharge. An ore dressing plant located in the upstream of Lhasa River produces nearly two million tons of dressing wastewater yearly. Various substances emitted in the dressing of wastewater includes CODCr, sulfide, SS, heavy metal ions, and many more exceeds the national emission standard. The major toxic pollutants in the dressing of wastewater are heavy metal irons which can hardly decompose in the natural environment, hence they have a long-term degradation effect on the natural environment. The introduction of organic mineral processing reagents to the mineral dressing process can be beneficial in removing higher amounts of CODCr in dressing of wastewater. Additionally, the most common used of organic agents, like heavy metal complex reagents and chelating agents, are likely to form some more polluting compounds with the heavy mental irons, copper, zinc, cadmium, mercury and so on, in the dressing of waste water, rendering a further pollution. These pollutants might lead to gene mutation and chromosome disorder if they enter human body through the food chains, and they can result in disability and other health menace. Thus these measures are very necessary for several reasons include of saving water resource, protecting the water quality of Lhasa River or keeping sustainable development for this company. In the world today, the predominant control methods of dressing wastewater are coagulation precipitate, ion exchange method, electrodialysis, oxygenolysis, flotation process, biological method and so on with regard to the above mentioned challenges of wastewater, the mere use of one technique of wastewater disposal can neither satisfy the emission standards of wastewater, nor can it meet the requirements of reusing the wastewater. This study is carried out by combining coagulation precipitate method with C1O2 oxygenolysis to control wastewater dressing challenges. From the results, the treated dressing wastewater is completely fits into the national emission standard, and 100 percent of treated dressing wastewater could be reused in industrial production with the flotation index is nearly the same as that of fresh water, hi short, this new method has striking significant in improving economic and social benefits.
作者机构：
[于大炮; 代力民; 周莉] Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China;College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;Liaoning Technical University, Fuxin 130021, Liaoning, China;Jilin Forest Industry Group Limited Liability Company, Changchun 130021, China;[刘正纲] Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China, Liaoning Technical University, Fuxin 130021, Liaoning, China
通讯机构：
[Dai, L.-M.] I;Institute of Applied Ecology, Chinese Academy of Sciences, China
摘要：
The ZnO nanorods (diameter of 40 nm and 100 nm) were modified with Ru(dcbpy)(2)(NCS)(2) (RuN3), and their responses to formaldehyde were measured at room temperature. All the results showed that the responses to formaldehyde of modified ZnO were higher than that of bare ZnO; especially the responses of modified ZnO nanorods with diameter of 40 nm-5 ppm formaldehyde was about 200% higher than that of bare ZnO. The UV-vis absorption spectrum and transient photovoltage analysis showed that the high responses of modified ZnO mainly arose from the strong photocatalytic oxidizing effect induced by the increasing of the absorption and photo-generated electron-hole separation. Our results demonstrate that the modification of RuN3 is a promising approach on improving the formaldehyde responses of ZnO nanorods. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
