Dry-thermophilic anaerobic digestion of organic fraction of municipal solid waste: Methane production modeling

Journal Article · Thu Mar 15 00:00:00 EDT 2012 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2011.11.002· OSTI ID:21612942

Alvarez-Gallego, C ^[1]; Sales, D ^[2]; Romero Garcia, L I ^[1]

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1. Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cadiz, 11510 Puerto Real, Cadiz (Spain)
2. Department of Environmental Technologies, Faculty of Marine and Environmental Sciences, University of Cadiz, 11510 Puerto Real, Cadiz (Spain)

Highlights: Black-Right-Pointing-Pointer Methane generation may be modeled by means of modified product generation model of Romero Garcia (1991). Black-Right-Pointing-Pointer Organic matter content and particle size influence the kinetic parameters. Black-Right-Pointing-Pointer Higher organic matter content and lower particle size enhance the biomethanization. - Abstract: The influence of particle size and organic matter content of organic fraction of municipal solid waste (OFMSW) in the overall kinetics of dry (30% total solids) thermophilic (55 Degree-Sign C) anaerobic digestion have been studied in a semi-continuous stirred tank reactor (SSTR). Two types of wastes were used: synthetic OFMSW (average particle size of 1 mm; 0.71 g Volatile Solids/g waste), and OFMSW coming from a composting full scale plant (average particle size of 30 mm; 0.16 g Volatile Solids/g waste). A modification of a widely-validated product-generation kinetic model has been proposed. Results obtained from the modified-model parameterization at steady-state (that include new kinetic parameters as K, Y{sub pMAX} and {theta}{sub MIN}) indicate that the features of the feedstock strongly influence the kinetics of the process. The overall specific growth rate of microorganisms ({mu}{sub max}) with synthetic OFMSW is 43% higher compared to OFMSW coming from a composting full scale plant: 0.238 d{sup -1} (K = 1.391 d{sup -1}; Y{sub pMAX} = 1.167 L CH{sub 4}/gDOC{sub c}; {theta}{sub MIN} = 7.924 days) vs. 0.135 d{sup -1} (K = 1.282 d{sup -1}; Y{sub pMAX} = 1.150 L CH{sub 4}/gDOC{sub c}; {theta}{sub MIN} = 9.997 days) respectively. Finally, it could be emphasized that the validation of proposed modified-model has been performed successfully by means of the simulation of non-steady state data for the different SRTs tested with each waste.

• OSTI ID: 21612942
• Journal Information: Waste Management, Vol. 32, Issue 3; Other Information: DOI: 10.1016/j.wasman.2011.11.002; PII: S0956-053X(11)00499-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ANAEROBIC DIGESTION
COMPOSTING
ENVIRONMENTAL ENGINEERING
METHANE
MICROORGANISMS
PARTICLE SIZE
REACTION KINETICS
SIMULATION
SOLID WASTES
STEADY-STATE CONDITIONS
TANKS
THERMOPHILIC CONDITIONS
VOLATILITY
ALKANES
BIOCONVERSION
CONTAINERS
DIGESTION
ENGINEERING
HYDROCARBONS
KINETICS
MANAGEMENT
ORGANIC COMPOUNDS
PROCESSING
SIZE
WASTE MANAGEMENT
WASTE PROCESSING
WASTES