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| Spent SCR Catalysts and Environmental Management in Typical Coal-fired Power Plant |
| Received:October 23, 2017 Revised:February 15, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.02.009 |
| KeyWord:flue gas denitrification selective catalytic reduction spent catalyst hazardous wastes |
| Author | Institution |
| CAO Li-mei |
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai , China |
| WANG Qing |
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai , China |
| ZHANG Wei |
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai , China |
| QIU Zhao-fu |
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai , China |
| YANG Ji |
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai , China |
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| Abstract: |
| Objective To propose counter measures for composition analysis, output estimation and disposal methods of spent SCR catalysts. Methods Inductive coupled plasma emission spectrometer (ICP) was used to analyze chemical component of large amount of SCR catalyst generated in spent SCR catalysts. A mathematical model was used to estimate the amount of waste SCR produced, and the reasons for the inclusion of spent SCR catalyst in the hazardous waste lists was given on this basis. Results On the basis of coal-fired power plant installed capacity, from the year of 2017, large amount of spent SCR catalyst solid waste will come in China, and the amount will increase year by year. It will reach 25×104~30×104 m3per year after 2020. Ti was the highest content in the spent SCR catalyst, accounting for 23.3%~46.2%. Wolfram (W), vanadium (V), molybdenum (Mo) and barium (Ba) were active components in catalyst. And the ratio of different element was different in different catalysts. The content of vanadium had great influence on the potential determination of spent SCR catalyst. At the same time, the SCR catalyst might adsorb arsenic (As), mercury (Hg), cadmium (Cd) and other heavy metals, which would increase the chemical composition of the spent SCR catalyst. According to relecant provisions in National Hazardous Waste List, the spent SCR catalysts could not be ruled out from hazardous characteristics, no treatment or improper treatment might have adverse effect on human body and environment. On this basis, it is suggested to put the spent SCR catalysts into the hazardous waste list. Conclusion The spent SCR catalyst is a new kind of hazardous waste which has been present in China and will be long existed. There is no sufficient experience on its treatment. It is needed to explore the feasible monitoring and management measures of spent SCR catalysts, and finally implement effective supervision over the spent SCR catalysts for the aim of beautiful China of "Blue sky, green land and clear water". |
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