Tampere University of Technology

TUTCRIS Research Portal

Storing of exoelectrogenic anolyte for efficient microbial fuel cell recovery

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
JournalEnvironmental Technology
Volume40
Issue number11
Early online date2018
DOIs
Publication statusPublished - 2019
Publication typeA1 Journal article-refereed

Abstract

Starting up a microbial fuel cell (MFC) requires often a long-term culture enrichment period, which is a challenge after process upsets. The purpose of this study was to develop low cost storage for microbial fuel cell enrichment culture to enable prompt process recovery after upsets. Anolyte of an operating xylose-fed MFC was stored at different temperatures and for different time periods. Storing the anolyte for one week or one month at +4 °C did not significantly affect power production, but lag time for power production was increased from 2 days to 3 or 5 days, respectively. One month storing at -20 °C increased the lag time to 7 days. The average power density in these MFCs varied between 1.2 and 1.7 W/m3. The share of dead cells (measured by live/dead staining) increased with storing time. After six-month storage the power production was insignificant. However, xylose removal remained similar in all cultures (99-100%) whilst volatile fatty acids production varied. The results indicate that fermentative organisms tolerated the long storage better than the exoelectrogens. As storing at +4 °C is less energy intensive compared to freezing, anolyte storage at +4 °C for maximum of one month is recommended as start-up seed for MFC after process failure to enable efficient process recovery.

Publication forum classification

Field of science, Statistics Finland

Downloads statistics

No data available