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  • Title: Influence of two types of sludge on the biogas production of assorted waste streams and the significance of beef cattle waste and liquid cheese whey in the organic fraction of municipal solid waste.
    Author: Peña-Vargas MY, Durán-Moreno A.
    Journal: J Environ Sci Health A Tox Hazard Subst Environ Eng; 2018; 53(14):1235-1242. PubMed ID: 30623715.
    Abstract:
    The aim of this study was to assess the biogas production generated by the anaerobic co-digestion of two co-substrates-liquid cheese whey (LCW) and beef cattle waste (BCW)-mixed with the organic fraction of municipal solid waste (OFMSW) and inoculated with either granular or suspended sludge. At the end of co-digestion, a high biogas yield was observed for the granular sludge mixture of OFMSW and BCW, which provides support for beef cattle waste as a promising substrate for biogas production. The mixture of OFMSW and LCW resulted in an enhancement of biogas production compared to OFMSW alone; however, the characteristics of LCW led to instability during the process. The key finding was that the type of sludge used influences the biogas production of the mixture. For the two sludges tested, the reactors containing granular sludge produced more biogas than those with suspended sludge. Reactors inoculated with a granular sludge produced 70% more biogas with the mixture of OFMSW and BCW compared to those with the suspended sludge. The OFMSW and LCW mixture with granular sludge produced 16% more biogas than with the suspended sludge.
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