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Excessive Scum Generation Consequences on Performance of Biogas Power Plant under Unregulated Alkanity

Department of Mechanical Engineering, D. Y. Patil College of Engineering, Akurdi, Pune-411 032 (Maharashtra),
*(e-mail :; Mobile : 9665704444; 8788497561)
(Received : July 18, 2020; Accepted : December 25, 2021)


Excessive scum formations adversely impacted on the economy, biology and functionality of the biogas
plant. After the scumming events, the significant declination in overall performance of biogas plant was
observed. In this research work, the critical experimentations were done on full scale biodigester from
June 2017 to March 2019. The critical experimentations concluded the direct influence of the excessive
scum formation on biogas generations, methane contents, pH of process and TSS contents. During the
hot summer months, cold months of winters, rainy seasons and during the sudden change in a day
temperatures the excessive scum formations occurred which hampered the overall performance of the
biogas plant. The yield of biogas generation was reduced to 60% than normal biogas generations. The
methane contents were only limited to 42%. pH was reported up to 6.1 only. Total solid contents were
limited to only 1% which were expected to be 5 to 8%.
Key words : : Biogas, pH, MSW, methane, scum