AI Article Synopsis
- Bioaugmentation using a mix of Bacteria and Archaea improved anaerobic digestion of sewage sludge, leading to better biogas and methane production, with biodegradation efficiency over 46%.
- The study tested different doses of the bioaugmentation mixture in reactors at 35 °C, resulting in an increased rate constant for biogas production as doses were raised.
- Next-generation sequencing showed a dominant bacterial species and identified the prevalent hydrogenotrophic methanogen among Archaea in the digesters.
Article Abstract
Bioaugmentation with a mixture of microorganisms (Bacteria and Archaea) was applied to improve the anaerobic digestion of sewage sludge. The study was performed in reactors operating at a temperature of 35 °C in semi-flow mode. Three runs with different doses of bioaugmenting mixture were conducted. Bioaugmentation of sewage sludge improved fermentation and allowed satisfactory biogas/methane yields and a biodegradation efficiency of more than 46%, despite the decrease in hydraulic retention time (HRT) from 20 d to 16.7 d. Moreover, in terms of biogas production, the rate constant k increased from 0.071 h to 0.087 h as doses of the bioaugmenting mixture were increased, as compared to values of 0.066 h and 0.069 h obtained with sewage sludge alone. Next-generation sequencing revealed that sp. predominated among Bacteria in digesters and that the hydrogenotrophic methanogen sp. was the most abundant genus among Archaea.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6121296 | PMC |
| http://dx.doi.org/10.3390/ijerph15081717 | DOI Listing |
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