Coupled effects of ferroferric oxide supplement and ethanol co-metabolism on the methanogenic oxidation of propionate.

Sci Total Environ

Guangdong Province Engineering Research Center for Urban Water Recycling and Environmental Safety, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, Guangdong, China. Electronic address:

Published: June 2020

Direct interspecies electron transfer (DIET) is a new electron-transfer strategy for enhanced propionate degradation. Ethanol can enrich the DIET species of Geobacter and conductive ferroferric oxide (FeO) can promote DIET. Therefore, coupled effects of ethanol and FeO on propionate degradation were investigated. The maximum CH production rate was increased by 81.4% by adding FeO when simultaneously fed with ethanol and propionate, while the improvement could not be observed without ethanol. The sludge conductivity and the electron transfer system activity by adding FeO were increased by 2.66 and 2.73 times, respectively. Besides, the relative abundance of functional microbes such as Geobacter, Syntrophobacter, Smithella, and Methanosaeta, and their functional genes were increased by the supplement of FeO. The improvement of propionate degradation by adding FeO was largely attributed to the co-existence of ethanol degradation. The DIET between Geobacter and Methanosaeta might provide more energies or rapidly consume the oxidation products to promote the propionate degradation.

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http://dx.doi.org/10.1016/j.scitotenv.2020.137992DOI Listing

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