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Article

Anaerobic Digestion for Biogas Production from Municipal Sewage Sludge: A Comparative Study between Fine Mesh Sieved Primary Sludge and Sedimented Primary Sludge

1
Department of Civil Engineering, University of Botswana, Gaborone, Botswana
2
Design of Environmental Processes Laboratory, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Weihua Zhao
Water 2021, 13(24), 3532; https://doi.org/10.3390/w13243532
Received: 19 October 2021 / Revised: 26 November 2021 / Accepted: 3 December 2021 / Published: 10 December 2021
Two different types of primary sewage sludge have been used as feedstock for production of biogas through anaerobic digestion (AD): the one type was sludge from a typical primary clarifier (PC), while the other type of sludge produced by a rotating belt filter, commonly called microsieve (MS). Initially the main physicochemical characteristics of the sludges, such as total solids (TS), volatile solids (VS), VS/TS, pH and carbon to nitrogen ratio (C/N) were determined, for MS: 37.86 ± 0.08%, 83.00 ± 0.41%, 0.83 ± 0.00, 6.67 ± 0.08 and 19.68 ± 0.69, respectively, and for PC: 2.61 ± 0.08%, 78.77 ± 1.91%, 0.79 ± 0.02, 6.61 ± 0.10 and 14.46 ± 1.23, respectively. Then, calculated amounts of the sludges were inserted into airtight vials and were inoculated using anaerobic sludge. The daily biogas production was measured over a period of 30 days. PC sludge maximized the daily biogas production (44.20 mlbiogas/gvsd) 11 days after inoculation, while the MS sludge reach a peak (37.74 mlbiogas/gvsd) 14 days after inoculation. The cumulative biogas production over the 30 days of AD was in the same laver (442.29 mlbiogas/gvs for PC versus 434.73 mlbiogas/gvs for MS). However, PC sludge indicated higher daily biogas production, compared to MS sludge, while the opposite was observed for the period following the peak point. The Volatile Solids Reduction for PC and MS sludges was recorded as 46.06% and 32.39%, respectively. View Full-Text
Keywords: anaerobic digestion; sewage sludge; biogas; primary clarifier; microsieve anaerobic digestion; sewage sludge; biogas; primary clarifier; microsieve
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MDPI and ACS Style

Odirile, P.T.; Marumoloa, P.M.; Manali, A.; Gikas, P. Anaerobic Digestion for Biogas Production from Municipal Sewage Sludge: A Comparative Study between Fine Mesh Sieved Primary Sludge and Sedimented Primary Sludge. Water 2021, 13, 3532. https://doi.org/10.3390/w13243532

AMA Style

Odirile PT, Marumoloa PM, Manali A, Gikas P. Anaerobic Digestion for Biogas Production from Municipal Sewage Sludge: A Comparative Study between Fine Mesh Sieved Primary Sludge and Sedimented Primary Sludge. Water. 2021; 13(24):3532. https://doi.org/10.3390/w13243532

Chicago/Turabian Style

Odirile, Phillimon T., Potlako M. Marumoloa, Anthoula Manali, and Petros Gikas. 2021. "Anaerobic Digestion for Biogas Production from Municipal Sewage Sludge: A Comparative Study between Fine Mesh Sieved Primary Sludge and Sedimented Primary Sludge" Water 13, no. 24: 3532. https://doi.org/10.3390/w13243532

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