title: Anaerobic co-digestion of wine/fruit-juice production waste with landfill leachate diluted municipal sludge cake under semi-continuous flow operation.
abstract: Anaerobic co-digestion of four organic waste streams; a thickened waste activated sludge (TWAS) and screen cake (SC) from a fruit-juice/winery wastewater treatment plant along with municipal sludge cake (MC) and landfill leachate (LL) was evaluated. A total of eight semi-continuously-fed single and co-digesters were operated side-by-side at sludge retention times (SRT) of 20 and 10 days. Co-digestion of industrial waste streams (TWAS and SC) with MC and LL resulted in increased operational stability compared to the single digestion of industrial TWAS at the higher organic loading (10 d SRT). Although digester operational temperature had no statistically significant effect on organics removal and biogas production, mesophilic digesters had consistently higher total coliform densities (8838-37,959 most probable number or MPN/g-dry weight) compared to the thermophilic digesters (41-6723 MPN/g-dry weight) at both SRTs. Coliform analysis results also proved that most of the thermophilic digestates could be classified as Class A biosolids according to regulations. Furthermore, addition of industrial TWAS to co-digesters enhanced the dewaterability of the digested streams. A cost-benefit analysis confirmed the benefits and indicated that a full-scale co-digester utilizing all four waste streams can decrease the total capital and operational cost by 22% ($10.52 million).
authors.affiliation: UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada.
authors.forename: M Barrantes
authors.initials: MB
authors.lastname: Leiva
authors.affiliation: UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada.
authors.forename: E Hosseini
authors.initials: EH
authors.lastname: Koupaie
authors.affiliation: UBC Bioreactor Technology Group, School of Engineering, The University of British Columbia, Okanagan Campus, 3333 University Way, Kelowna, BC V1V 1V7, Canada. Electronic address: cigdem.eskicioglu@ubc.ca.
authors.forename: C
authors.initials: C
authors.lastname: Eskicioglu
mesh_terms: D000693:Anaerobiosis; D001628:Beverages / Q000032:analysis; D019149:Bioreactors; D001955:British Columbia; D003362:Cost-Benefit Analysis; D019649:Food Industry; D007220:Industrial Waste / Q000032:analysis*; D062611:Solid Waste / Q000032:analysis*; D018505:Waste Management / Q000191:economics / Q000379:methods*; D014920:Wine / Q000032:analysis
chemical_list: D007220:Industrial Waste; D062611:Solid Waste
keywords: Anaerobic co-digestion; Coliforms; Cost-benefit analysis; Fruit-juice/winery waste; Landfill leachate; Municipal sludge