title: Evaluating inhibition conditions in high-solids anaerobic digestion of organic fraction of municipal solid waste.
abstract: High-solids anaerobic digestion (HSAD) processes, when applied to different types of organic fractions of municipal solid waste (OFMSW), may easily be subjected to inhibition due to organic overloading. In this study, a new approach for predicting these phenomena was proposed based on the estimation of the putrescibility (oxygen consumption in 20 h biodegradation, OD(20)) of the organic mixtures undergoing the HSAD process. Different wastes exhibiting different putrescibility were subjected to lab-scale batch-HSAD. Measuring the organic loading (OL) as volatile solids (VS) was found unsuitable for predicting overload inhibition, because similar VS contents corresponded to both inhibited and successful trials. Instead, the OL calculated as OD(20) was a very good indicator of the inhibiting conditions (inhibition started for OD(20)>17-18 g O(2)kg(-1)). This new method of predicting inhibition in the HSAD process of diverse OFMSW may be useful for developing a correct approach to the technology in very different contexts.
authors.affiliation: Gruppo Ricicla - Dipartimento di Produzione Vegetale - Università degli Studi di Milano, Via Celoria 2, 20133 Milano, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Schievano
authors.forename: Giuliana
authors.initials: G
authors.lastname: D'Imporzano
authors.forename: Luca
authors.initials: L
authors.lastname: Malagutti
authors.forename: Emilio
authors.initials: E
authors.lastname: Fragali
authors.forename: Gabriella
authors.initials: G
authors.lastname: Ruboni
authors.forename: Fabrizio
authors.initials: F
authors.lastname: Adani
mesh_terms: D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D001709:Biotechnology / Q000379:methods*; D002482:Cellulose / Q000737:chemistry; D002625:Chemistry, Organic / Q000379:methods; D006863:Hydrogen-Ion Concentration; D008031:Lignin / Q000737:chemistry; D008564:Membrane Potentials; D008697:Methane / Q000737:chemistry; D009930:Organic Chemicals / Q000302:isolation & purification*; D010100:Oxygen / Q000737:chemistry; D010101:Oxygen Consumption; D011134:Polysaccharides / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods; D012722:Sewage
chemical_list: D009930:Organic Chemicals; D011134:Polysaccharides; D012722:Sewage; C007916:hemicellulose; D002482:Cellulose; D008031:Lignin; D008697:Methane; D010100:Oxygen