title: Pyrolysis kinetics of algal consortia grown using swine manure wastewater.
abstract: In this study, pyrolysis kinetics of periphytic microalgae consortia grown using swine manure slurry in two seasonal climatic patterns in northwest Arkansas were investigated. Four heating rates (5, 10, 20 and 40 °C min(-1)) were used to determine the pyrolysis kinetics. Differences in proximate, ultimate, and heating value analyses reflected variability in growing substrate conditions, i.e., flocculant use, manure slurry dilution, and differences in diurnal solar radiation and air temperature regimes. Peak decomposition temperature in algal harvests varied with changing the heating rate. Analyzing pyrolysis kinetics using differential and integral isoconversional methods (Friedman, Flynn-Wall-Ozawa, and Kissinger-Akahira-Sunose) showed strong dependency of apparent activation energy on the degree of conversion suggesting parallel reaction scheme. Consequently, the weight loss data in each thermogravimetric test was modeled using independent parallel reactions (IPR). The quality of fit (QOF) for the model ranged between 2.09% and 3.31% indicating a good agreement with the experimental data.
authors.affiliation: Biological and Agricultural Engineering Department, University of Arkansas - Division of Agriculture, AR, USA.
authors.forename: Mahmoud A
authors.initials: MA
authors.lastname: Sharara
authors.affiliation: Biological and Agricultural Engineering Department, University of Arkansas - Division of Agriculture, AR, USA.
authors.forename: Nathan
authors.initials: N
authors.lastname: Holeman
authors.affiliation: Biological and Agricultural Engineering Department, University of Arkansas - Division of Agriculture, AR, USA. Electronic address: ssadaka@uaex.edu.
authors.forename: Sammy S
authors.initials: SS
authors.lastname: Sadaka
authors.affiliation: Biological and Agricultural Engineering Department, University of Arkansas - Division of Agriculture, AR, USA.
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Costello
mesh_terms: D000818:Animals; D001709:Biotechnology / Q000379:methods*; D004602:Elements; D006361:Heating; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008372:Manure; D058086:Microalgae / Q000254:growth & development*; D013045:Species Specificity; D013818:Thermogravimetry; D062065:Wastewater
chemical_list: D004602:Elements; D008372:Manure; D062065:Wastewater
keywords: Kinetic modeling; Microalgae; Phycoremediation; Pyrolysis; TGA