Enhancement of Biogas Production via Co-Digestion of Wastewater Treatment Sewage Sludge and Brewery Spent Grain: Physicochemical Characterization and Microbial Community
| Autor: | Ryneth Mbhele, Esta van Heerden, Michael O. Daramola, Khuthadzo Mudzanani |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
municipal sludge
Methanogenesis 020209 energy Geography Planning and Development Alkalinity TJ807-830 02 engineering and technology 010501 environmental sciences Management Monitoring Policy and Law TD194-195 biodegradation 01 natural sciences Renewable energy sources Biogas 0202 electrical engineering electronic engineering information engineering GE1-350 anaerobic co-digestion 0105 earth and related environmental sciences Environmental effects of industries and plants biology Renewable Energy Sustainability and the Environment Chemistry methanogenesis and brewery spent grains Biodegradation Pulp and paper industry biology.organism_classification Methanogen Environmental sciences Microbial population biology Sewage treatment microbial community Sludge |
| Zdroj: | Sustainability Volume 13 Issue 15 Sustainability, Vol 13, Iss 8225, p 8225 (2021) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su13158225 |
| Popis: | The present study intends to evaluate a synergy towards enhanced biogas production by co-digesting municipal sewage sludge (SS) with brewery spent grain (BSG). To execute this, physicochemical and metagenomics analysis was conducted on the sewage sludge substrate. The automatic methane potential test system II (AMPTS II) biochemical methane potential (BMP) batch setup was operated at 35 ± 5 °C, pH range of 6.5–7.5 for 30 days’ digestion time on AMPTS II and 150 days on semi-continuous setup, where the organic loading rate (OLR) was guided by pH and the volatile fatty acids to total alkalinity (VFA/TA) ratio. Metagenomics analysis revealed that Proteobacteria was the most abundant phyla, consisting of hydrolytic and fermentative bacteria. The archaea community of hydrogenotrophic methanogen genus was enriched by methanogens. The highest BMP was obtained with co-digestion of SS and BSG, and 9.65 g/kg of VS. This not only increased biogas production by 104% but also accelerated the biodegradation of organic matters. However, a significant reduction in the biogas yield, from 10.23 NL/day to 2.02 NL/day, was observed in a semi-continuous process. As such, it can be concluded that different species in different types of sludge can synergistically enhance the production of biogas. However, the operating conditions should be optimized and monitored at all times. The anaerobic co-digestion of SS and BSG might be considered as a cost-effective solution that could contribute to the energy self-efficiency of wastewater treatment works (WWTWs) and sustainable waste management. It is recommended to upscale co-digestion of the feed for the pilot biogas plant. This will also go a long way in curtailing and minimizing the impacts of sludge disposal in the environment. |
| Databáze: | OpenAIRE |
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