title: Grease waste and sewage sludge co-digestion enhancement by thermal hydrolysis: batch and fed-batch assays.
abstract: Grease waste (GW) is an adequate substrate for sewage sludge co-digestion since, coming from a waste water treatment plant, it has a high methane potential (489 NmLCH(4)/gVSin); however, no synergistic effect takes place when co-digesting with 52%VS grease. Conversely, thermal hydrolysis (TH) improves the anaerobic digestion of GW (43% higher kinetics) and biological sludge (29% more methane potential). Therefore, the application of TH to a co-digestion process was further studied. First, biochemical methane potential tests showed that the best configuration to implement the TH to the co-digestion process is pretreating the biological sludge alone, providing a 7.5% higher methane production (398 NmLCH(4)/gVSin), 20% faster kinetics and no lag-phase. Its implementation in a fed-batch operation resulted in considerable methane production (363 NmLCH(4)/gVSin) and TH improved the rheology and dewaterability properties of the digestate. This leads to important economical savings when combined with co-digestion, reducing final waste management costs and showing interesting potential for full-scale application.
authors.affiliation: Chemical Engineering and Environmental Technology Department, University of Valladolid, Prado de la Magdalena 47011, Valladolid, Spain E-mail: maria@iq.uva.es.
authors.forename: R
authors.initials: R
authors.lastname: Cano
authors.affiliation: Chemical Engineering and Environmental Technology Department, University of Valladolid, Prado de la Magdalena 47011, Valladolid, Spain E-mail: maria@iq.uva.es.
authors.forename: A
authors.initials: A
authors.lastname: Nielfa
authors.affiliation: CETaqua, Water Technology Centre, Ctra. d'Esplugues 75, 08940 Cornellà, Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Pérez
authors.affiliation: CETaqua, Water Technology Centre, Ctra. d'Esplugues 75, 08940 Cornellà, Barcelona, Spain.
authors.forename: L
authors.initials: L
authors.lastname: Bouchy
authors.affiliation: Chemical Engineering and Environmental Technology Department, University of Valladolid, Prado de la Magdalena 47011, Valladolid, Spain E-mail: maria@iq.uva.es.
authors.forename: M
authors.initials: M
authors.lastname: Fdz-Polanco
mesh_terms: D019149:Bioreactors; D005502:Food; D006358:Hot Temperature; D006868:Hydrolysis; D012722:Sewage; D062611:Solid Waste; D014865:Waste Disposal, Fluid
chemical_list: D012722:Sewage; D062611:Solid Waste