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Comparative study of the effect of ultrasonication on the anaerobic biodegradability of food waste in single and two-stage systems |
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| Authors: | Elbeshbishy Elsayed Nakhla George |
| Institution: | Department of Civil and Environmental Engineering, University of Western Ontario, London, Ont., Canada N6A 5B9 |
| Abstract: | Five different mesophilic systems were evaluated in this study for the anaerobic treatment of food waste. Systems A and B were one stage methane with unsonicated and sonicated feeds, respectively, while, systems C and D were two-stage hydrogen and methane with unsonicated and sonicated feeds, respectively. System E comprised a novel sonicated biological hydrogen reactor (SBHR) followed by methane reactor. The results showed that sonication inside the reactor in the first stage (system E) showed superior results compared to all other systems. Overall VSS removal efficiencies of 67%, 59%, 51%, 44%, and 36% were achieved in systems E, D, C, B, and A, respectively. Volumetric hydrogen production rates of 4.8, 3.3, and 2.6 L H2/Lreactor d were achieved in the SBHR, CSTR with and without sonicated feed, respectively, while, methane production rates of 1.6, 2.1, 2.3, 2.6, and 3.2 L CH4/Lreactor d were achieved in systems A-E, respectively. |
| Keywords: | SBHR sonicated biological hydrogen reactor SSO source separate organics MSW municipal solid waste WAS waste activated sludge CSTR continuously-stirred tank reactor HRT hydraulic retention time SRTs solids retention times TSS total suspended solids VSS volatile suspended solids DOPF Dufferin Organics Processing Facility TS total solids VS volatile solids TCOD total chemical oxygen demand SCOD soluble chemical oxygen demand VFAs volatile fatty acids EPS extracellular polymeric substances DGGE denaturing gradient gel electrophoresis P-protein particulate protein B-protein bound protein S-protein soluble protein T-carbohydrate total carbohydrate S-carbohydrate soluble carbohydrate |
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