### Goethite-enhanced anaerobic bio-decomposition of sulfate mineralsGoethite-enhanced anaerobic bio-decomposition of sulfate minerals

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 Author Chen, Tianhu ♦ Wang, Jin ♦ Jin, Xin ♦ Yue, Zhengbo Source SpringerLink Content type Text Publisher SP Higher Education Press File Format PDF Copyright Year ©2010 Language English
 Subject Domain (in DDC) Natural sciences & mathematics ♦ Earth sciences Subject Keyword goethite ♦ sulfate-reducing bacteria ♦ sulfate minerals ♦ gypsum ♦ anhydrite ♦ Earth Sciences Abstract The effects of goethite on the anaerobic bio-decomposition of sulfate minerals were investigated by using the beef extract as a carbon source and the activated sludge as the source of mixed bacteria. Solution pH, sulfate concentration, total iron ion concentration and the solid products of four different batch tests were monitored and analyzed. Experimental results showed that the presence of iron oxide can improve the alkalinity of the reaction system which results in the increase of pH value. Moreover, the added goethite consumed a large amount of H$_{2}$S generated from the sulfate minerals by SRB, thereby significantly enhancing the decomposition of gypsum and anhydrite compared with the control batch tests. In addition, the SEM observation and the EDS spectra showed that there were some rod-shaped microorganisms and new generated minerals, such as iron sulfide, calcium carbonate crystals, and elemental sulfur. Both of the proliferation of new minerals (iron sulfide and calcium carbonate crystals) and the complete disappearance of sulfate minerals indicated that iron oxide can play the role in fixing the S element through the metabolism of SRB and hence improve the bio-decomposition of sulfate minerals. ISSN 16737385 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2010-03-27 Publisher Institution Chinese Universities Publisher Place Heidelberg e-ISSN 16737490 Journal Frontiers of Earth Science in China Volume Number 4 Issue Number 2 Page Count 7 Starting Page 160 Ending Page 166