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

Water

Potlako M Marumoloa¹  Phillimon T Odirile¹  Petros Gikas²  Anthoula Manali² 

[1] Department of Civil Engineering, University of Botswana, Gaborone, Botswana;Design of Environmental Processes Laboratory, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Greece;

关键词: anaerobic digestion;    sewage sludge;    biogas;    primary clarifier;    microsieve;   

DOI  :  10.3390/w13243532

来源: DOAJ

【 摘 要 】

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 ml_biogas/g_vsd) 11 days after inoculation, while the MS sludge reach a peak (37.74 ml_biogas/g_vsd) 14 days after inoculation. The cumulative biogas production over the 30 days of AD was in the same laver (442.29 ml_biogas/g_vs for PC versus 434.73 ml_biogas/g_vs 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.

【 授权许可】

Unknown