title: Anaerobic Co-Digestion of Microalgae Scenedesmus sp. and TWAS for Biomethane Production.
abstract: The paper investigated the feasibility of biomethane (bio-CH4) production from the anaerobic co-digestion of the microalgae Scenedesmus quadricauda (S. quadricauda) and thickened waste activated sludge (TWAS). The concept was tested in bench-scale anaerobic digesters by varying the proportions of volatile solids (VS) loading from S. quadricauda and TWAS and two critical operational parameters, temperature and alkalinity. The CH(4) production for the various S. quadricauda and TWAS proportions ranged from 234 to 318 mL/g of chemical oxygen demand (COD) digested and 329 to 530 mL/g of VS digested at 35 °C. The reductions in total solids (TS), COD, and VS ranged from 25 to 44%, 46 to 53%, and 40 to 53%, respectively. Temperature had a significant effect on CH(4) production, lower temperatures greatly reduced CH(4) production. No significant difference in CH(4) production was observed for experiments conducted at alkalinity levels of 70, 1630, and 3200 mg/L as CaCO(3).
authors.affiliation: San Diego State University, Department of Civil, Construction and Environmental Engineering, 5500 Campanile Drive, San Diego California 92182, USA.
authors.forename: Temesgen
authors.initials: T
authors.lastname: Garoma
authors.forename: Don
authors.initials: D
authors.lastname: Nguyen
mesh_terms: D000693:Anaerobiosis; D056804:Biofuels / Q000032:analysis* / Q000382:microbiology; D018533:Biomass; D006863:Hydrogen-Ion Concentration; D008697:Methane / Q000378:metabolism*; D058086:Microalgae / Q000378:metabolism; D044444:Scenedesmus / Q000378:metabolism*; D012722:Sewage / Q000737:chemistry; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D056804:Biofuels; D012722:Sewage; D008697:Methane