Long-term stability of bioelectricity generation coupled with tetrathionate disproportionation
Research output: Contribution to journal › Article › Scientific › peer-review
|Number of pages||7|
|Publication status||Published - 1 Sep 2016|
|Publication type||A1 Journal article-refereed|
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.
- Acidophile, Disproportionation, Long-term stability, Microbial fuel cell, Tetrathionate