Contaminant mobility and carbon sequestration downstream of the Ajka (Hungary) red mud spill: The effects of gypsum dosing

The Science of the Total Environment
P RenforthKatalin Gruiz

Abstract

A number of emergency pollution management measures were enacted after the accidental release of caustic bauxite processing residue that occurred in Ajka, western Hungary in October, 2010. These centred on acid and gypsum dosing to reduce pH and minimise mobility of oxyanion contaminants mobile at high pH. This study assessed the effectiveness of gypsum dosing on contaminant mobility and carbon sequestration through assessment of red mud and gypsum-affected fluvial sediments via elemental analysis and stable isotope analysis. There was a modest uptake of contaminants (notably As, Cr, and Mn) on secondary carbonate-dominated deposits in reaches subjected to gypsum dosing. C and O stable isotope ratios of carbonate precipitates formed as a result of gypsum dosing were used to quantify the importance of the neutralisation process in sequestering atmospheric carbon dioxide. This process was particularly pronounced at sites most affected by gypsum addition, where up to 36% of carbonate-C appears to be derived from atmospheric in-gassing of CO(2). The site is discussed as a large scale analogue for potential remedial approaches and carbon sequestration technologies that could be applied to red mud slurries and other hyperalkaline was...Continue Reading

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Citations

Feb 14, 2012·Environmental Science & Technology·Ian T BurkeKatalin Gruiz
Aug 27, 2013·Environmental Science and Pollution Research International·Andrea Szabó NagyIstván Vass
Dec 19, 2012·Journal of Hazardous Materials·Chunhua SiChuxia Lin
Nov 14, 2014·Environmental Toxicology and Chemistry·M Nazaret González-AlcarazCornelis A M van Gestel
Mar 13, 2015·Environmental Science and Pollution Research International·Cindy L LockwoodIan T Burke
Jul 23, 2013·Journal of Environmental Management·Vasile-Mircea Cristea
Jul 8, 2014·The Science of the Total Environment·Miroslav MišíkSiegfried Knasmueller
May 3, 2016·The Science of the Total Environment·Wenxu DongChunsheng Hu
Aug 31, 2016·Environmental Science and Pollution Research International·Feng ZhuFusong Han
Oct 25, 2016·Environmental Science and Pollution Research International·Faradiella Mohd KusinMohd Syakirin Md Z
Nov 14, 2016·Journal of Hazardous Materials·Xiangfeng KongYiwei Li
Oct 15, 2014·Environmental Science. Processes & Impacts·Á D AntonW M Mayes
Jul 10, 2012·Journal of Environmental Monitoring : JEM·Orsolya KleberczKatalin Gruiz
Jan 28, 2015·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·Ian T BurkeVictoria S Coker
Feb 28, 2016·Environmental Science and Pollution Research International·Zhi-Chao WenYan Liang
Nov 1, 2016·Environmental Science and Pollution Research International·Muxi LuoFengting Li
Oct 8, 2016·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·Andrea Szabó NagyIstván Vass
Nov 7, 2018·Journal of Hazardous Materials·Yaxian ZhangJose Tacares Araruna Junior
Jun 13, 2018·Environmental Science & Technology·William Matthew MayesPhil Renforth
Nov 29, 2017·Environmental Science & Technology·Andrew W BrayIan T Burke

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