Mudzanani, KhuthadzoVan Heerden, EMbhele, Nkhangweleni RDaramola, MO2021-11-232021-11-232021-07Mudzanani, K., Van Heerden, E., Mbhele, N.R. & Daramola, M. 2021. Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community. <i>Sustainability, 13(15).</i> http://hdl.handle.net/10204/121672071-1050https://doi.org/10.3390/su13158225http://hdl.handle.net/10204/12167The 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.FulltextenAnaerobic co-digestionBiodegradationBrewery spent grainsMethanogenesisMicrobial communityMunicipal sludgeArticleMudzanani, K., Van Heerden, E., Mbhele, N. R., & Daramola, M. (2021). Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community. <i>Sustainability, 13(15)</i>, http://hdl.handle.net/10204/12167Mudzanani, Khuthadzo, E Van Heerden, Nkhangweleni R Mbhele, and MO Daramola "Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community." <i>Sustainability, 13(15)</i> (2021) http://hdl.handle.net/10204/12167Mudzanani K, Van Heerden E, Mbhele NR, Daramola M. Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community. Sustainability, 13(15). 2021; http://hdl.handle.net/10204/12167.TY - Article AU - Mudzanani, Khuthadzo AU - Van Heerden, E AU - Mbhele, Nkhangweleni R AU - Daramola, MO AB - 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. DA - 2021-07 DB - ResearchSpace DP - CSIR J1 - Sustainability, 13(15) KW - Anaerobic co-digestion KW - Biodegradation KW - Brewery spent grains KW - Methanogenesis KW - Microbial community KW - Municipal sludge LK - https://researchspace.csir.co.za PY - 2021 SM - 2071-1050 T1 - Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community TI - Enhancement of biogas production via co-digestion of wastewater treatment sewage sludge and brewery spent grain: Physicochemical characterization and microbial community UR - http://hdl.handle.net/10204/12167 ER -2498424975