title: Treatment of slaughterhouse wastewaters using anaerobic filters.
abstract: In this paper, a laboratory-scale experimentation allowed comparing the performances of two upflow anaerobic packed-bed filters filled with different packing materials and operating at mesophilic conditions (30 degreeC) for treating slaughterhouse wastewaters. Methane production was experimentally evaluated considering different volumetric organic loading rates as well as feeding overloading conditions. Although filter performances declined with loading rates higher than 6 kg CODin m-3 d-1 , the chemical oxygen demand (COD) removal efficiency remained always above 60%. The experimental results allowed for determining kinetic parameters for bacterial growth rate and methane production, following Monod and Chen-Hashimoto models, respectively. Results demonstrated that the reactors reached a cellular retention time significantly greater than the hydraulic retention time. The kinetic parameter values (Ks, l/max) revealed the low microorganisms' affinity for the substrate and confirmed the moderate biodegradability of slaughterhouse wastewater. The kinetic analysis also allowed the comparison of the filters performances with another anaerobic system and the assessment of the parameters useful for real-scale plant design. The system design, applied to a medium-sized Argentinean slaughterhouse, demonstrated to (i) be energetically self-sufficient and (ii) contribute to the plant's water heating requirements.
authors.affiliation: National University of Santiago del Estero, Av. Belgrano 1912, Santiago del Estero 4200, Argentina.
authors.forename: Sandra Luz
authors.initials: SL
authors.lastname: Martinez
authors.affiliation: Department of Science and High Technology, Insubria University of Varese, Via G.B. Vico, 46, Varese 1-21100, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Torretta
authors.affiliation: Department of Rural Engineering, Politechnic of Madrid, Ciudad Universitaria, Madrid 28040, Spain.
authors.forename: Jésus Vázquez
authors.initials: JV
authors.lastname: Minguelac
authors.affiliation: National Council of Technical and Scientific Research (PROIMI-CONICET), Av.Belgrano y pje. Caseros, San Miguel deTucumcn 4000, Argentina.
authors.forename: Faustino
authors.initials: F
authors.lastname: Siñeriz
authors.affiliation: Department of Science and High Technology, Insubria University of Varese, Via G.B. Vico, 46, Varese 1-21100, Italy.
authors.forename: Massimo
authors.initials: M
authors.lastname: Raboni
authors.affiliation: Department of Science and High Technology, Insubria University of Varese, Via G.B. Vico, 46, Varese 1-21100, Italy.
authors.forename: Sabrina
authors.initials: S
authors.lastname: Copelli
authors.affiliation: Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, Trento 1-38123, Italy
authors.forename: Elena Cristina
authors.initials: EC
authors.lastname: Rada
authors.affiliation: Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, Trento 1-38123, Italy
authors.forename: Marco
authors.initials: M
authors.lastname: Ragazzi
mesh_terms: D000003:Abattoirs / Q000295:instrumentation*; D001421:Bacteria, Anaerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007700:Kinetics; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D008954:Models, Biological; D014462:Ultrafiltration / Q000295:instrumentation*; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000295:instrumentation*
chemical_list: D008697:Methane; D062065:Wastewater