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Red mud enhances methanogenesis with the simultaneous improvement of hydrolysis-acidification and electrical conductivity.
- Source :
-
Bioresource Technology . Dec2017, Vol. 247, p131-137. 7p. - Publication Year :
- 2017
-
Abstract
- The role of red mud in the improvement of methanogenesis during sludge anaerobic digestion was innovatively investigated in this study. The results demonstrated that the addition of 20 g/L red mud resulted in a 35.5% increase in methane accumulation. Red mud effectively promoted the hydrolysis-acidification of organic compounds in the sludge, which resulted in the increase of protein, polysaccharide, and VFAs by 5.1–94.5%. The activities of key enzymes were improved by 41.4–257.3%. Electrochemical measurements presented direct evidence that the electrical conductivity was significantly improved with red mud. More conductive magnetite was formed during the secondary mineralization after Fe(III) reduction by Fe (III)-reducing genes such as Clostridiaceae and Ruminococcaceae . The higher conductivity enhanced the electron transfer between the syntrophic bacteria ( Geobacteraceae ) and methanogens ( Methanosaeta and Methanosarcina ), and then improved the methanogenesis. This research provides a novel perspective on the synergism between sludge and red mud for methane production. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 247
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 126635033
- Full Text :
- https://doi.org/10.1016/j.biortech.2017.08.063