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Long-term stability of bioelectricity generation coupled with tetrathionate disproportionation

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)876-882
Number of pages7
JournalBioresource Technology
Volume216
DOIs
Publication statusPublished - 1 Sep 2016
Publication typeA1 Journal article-refereed

Abstract

To prevent uncontrolled acidification of the environment, reduced inorganic sulfur compounds (RISCs) can be bioelectrochemically removed from water streams. The long-term stability of bioelectricity production from tetrathionate (S4O6 2-) was studied in highly acidic conditions (pH <2.5) in two-chamber fed-batch microbial fuel cells (MFCs). The maximum current density was improved from previously reported 80 mA m-2 to 225 mA m-2 by optimizing the external resistance. The observed reaction products of tetrathionate disproportionation were sulfate and elemental sulfur. In long-term run, stable electricity production was obtained for over 700 days with the average current density of 150 mA m-2. The internal resistance of the MFC decreased over time and no biofouling was observed. This study shows that tetrathionate is an efficient substrate also for long-term bioelectricity production.

Keywords

  • Acidophile, Disproportionation, Long-term stability, Microbial fuel cell, Tetrathionate

Publication forum classification

Field of science, Statistics Finland