title: Modelling of composting process of different organic waste at pilot scale: Biodegradability and odor emissions.
abstract: The composting process of six different compostable substrates and one of these with the addition of bacterial inoculums carried out in a dynamic respirometer was evaluated. Despite the heterogeneity of the compostable substrates, cumulative oxygen demand (OD, mgO2kgVS) was fitted adequately to an exponential regression growing until reaching a maximum in all cases. According to the kinetic constant of the reaction (K) values obtained, the wastes that degraded more slowly were those containing lignocellulosic material (green wastes) or less biodegradable wastes (sewage sludge). The odor emissions generated during the composting processes were also fitted in all cases to a Gaussian regression with R2values within the range 0.8-0.9. The model was validated representing real odor concentration near the maximum value against predicted odor concentration of each substrate, (R2=0.9314; 95% prediction interval). The variables of maximum odor concentration (ouE/m3) and the time (h) at which the maximum was reached were also evaluated statistically using ANOVA and a post-hoc Tukey test taking the substrate as a factor, which allowed homogeneous groups to be obtained according to one or both of these variables. The maximum oxygen consumption rate or organic matter degradation during composting was directly related to the maximum odor emission generation rate (R2=0.9024, 95% confidence interval) when only the organic wastes with a low content in lignocellulosic materials and no inoculated waste (HRIO) were considered. Finally, the composting of OFMSW would produce a higher odor impact than the other substrates if this process was carried out without odor control or open systems.
authors.affiliation: Department of Inorganic Chemistry and Chemical Engineering, University of Cordoba, Campus Universitario de Rabanales, Building Marie Curie (C-3), Ctra. N-IV, km 396, 14071 Cordoba, Spain.
authors.forename: M C
authors.initials: MC
authors.lastname: Gutiérrez
authors.affiliation: Department of Inorganic Chemistry and Chemical Engineering, University of Cordoba, Campus Universitario de Rabanales, Building Marie Curie (C-3), Ctra. N-IV, km 396, 14071 Cordoba, Spain.
authors.forename: J A
authors.initials: JA
authors.lastname: Siles
authors.affiliation: Department of Statistics, Econometry, Op. Res., Business Org. and Applied Econ., University of Córdoba, Campus Universitario de Rabanales, Building Albert Einstein (C-2), Ctra. N-IV, km 396, 14071 Cordoba, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Diz
authors.affiliation: Department of Inorganic Chemistry and Chemical Engineering, University of Cordoba, Campus Universitario de Rabanales, Building Marie Curie (C-3), Ctra. N-IV, km 396, 14071 Cordoba, Spain.
authors.forename: A F
authors.initials: AF
authors.lastname: Chica
authors.affiliation: Department of Inorganic Chemistry and Chemical Engineering, University of Cordoba, Campus Universitario de Rabanales, Building Marie Curie (C-3), Ctra. N-IV, km 396, 14071 Cordoba, Spain. Electronic address: iq2masam@uco.es.
authors.forename: M A
authors.initials: MA
authors.lastname: Martín
mesh_terms: D000704:Analysis of Variance; D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D008031:Lignin / Q000737:chemistry; D008962:Models, Theoretical; D016011:Normal Distribution; D009812:Odorants; D009930:Organic Chemicals / Q000737:chemistry*; D010100:Oxygen; D010101:Oxygen Consumption; D012037:Refuse Disposal / Q000379:methods*; D012044:Regression Analysis; D012722:Sewage; D012903:Smell; D012987:Soil / Q000737:chemistry*; D013696:Temperature
chemical_list: D009930:Organic Chemicals; D012722:Sewage; D012987:Soil; C036909:lignocellulose; D008031:Lignin; D010100:Oxygen
keywords: Cumulative oxygen demand; Dynamic respirometer; Odor concentration; Odor emission rate