title: Kinetic parameter estimation model for anaerobic co-digestion of waste activated sludge and microalgae.
abstract: Anaerobic co-digestion has a potential to improve biogas production, but limited kinetic information is available for co-digestion. This study introduced regression-based models to estimate the kinetic parameters for the co-digestion of microalgae and Waste Activated Sludge (WAS). The models were developed using the ratios of co-substrates and the kinetic parameters for the single substrate as indicators. The models were applied to the modified first-order kinetics and Monod model to determine the rate of hydrolysis and methanogenesis for the co-digestion. The results showed that the model using a hyperbola function was better for the estimation of the first-order kinetic coefficients, while the model using inverse tangent function closely estimated the Monod kinetic parameters. The models can be used for estimating kinetic parameters for not only microalgae-WAS co-digestion but also other substrates' co-digestion such as microalgae-swine manure and WAS-aquatic plants.
authors.affiliation: Department of Civil and Environmental Engineering, University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620, United States.
authors.forename: Eunyoung
authors.initials: E
authors.lastname: Lee
authors.affiliation: Environmental Engineering Department, University of Florida, Gainesville, FL 32611, United States.
authors.forename: Jewel
authors.initials: J
authors.lastname: Cumberbatch
authors.affiliation: Department of Civil and Environmental Engineering, University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620, United States.
authors.forename: Meng
authors.initials: M
authors.lastname: Wang
authors.affiliation: Department of Civil and Environmental Engineering, University of South Florida, 4202 E Fowler Avenue, Tampa, FL 33620, United States. Electronic address: qiongzhang@usf.edu.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels; D002708:Chlorella / Q000378:metabolism; D006868:Hydrolysis; D007700:Kinetics; D008372:Manure; D008697:Methane / Q000096:biosynthesis*; D058086:Microalgae / Q000378:metabolism*; D008962:Models, Theoretical; D012722:Sewage; D013552:Swine; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*
chemical_list: D056804:Biofuels; D008372:Manure; D012722:Sewage; D008697:Methane
keywords: Anaerobic co-digestion; First-order kinetic model; Kinetic parameter; Microalgae; Monod model; Waste activated sludge