title: Modeling anaerobic digestion of blue algae: stoichiometric coefficients of amino acids acidogenesis and thermodynamics analysis.
abstract: In order to facilitate the application of Anaerobic Digestion Model No. 1 (ADM1), an approach for a detailed calculation of stoichiometric coefficients for amino acids acidogenesis during the anaerobic digestion of blue algae is presented. The simulation results obtained support the approach by good predictions of the dynamic behavior of cumulative methane production, pH values as well as the concentrations of acetate, propionate, butyrate, valerate and inorganic nitrogen. The sensitivity analysis based on Monte Carlo simulation showed that the stoichiometric coefficients for amino acids acidogenesis had high sensitivities to the outputs of the model. The model further indicated that the Gibbs free energies from the uptake of long-chain fatty acids (LCFA), valerate and butyrate were positive through the digestion, while the free energies for other components were negative. During the digestion, the cumulative heat productions from microbial activities and methane were 77.69 kJ and 185.76 kJ, respectively. This result suggested that proper heat preservation of anaerobic digesters could minimize the external heating needs due to the heat produced from microbial activities.
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China; Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: yuanxz@qibebt.ac.cn.
authors: Xian-Zheng
authors: XZ
authors: Yuan
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China; Graduate University of Chinese Academy of Sciences, Beijing 100049, PR China.
authors: Xiao-Shuang
authors: XS
authors: Shi
authors: School of Mathematical Sciences, Ocean University of China, Qingdao 266100, PR China.
authors: Chun-Xin
authors: CX
authors: Yuan
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China; School of Environment and Civil Engineering, Jiangnan University, Wuxi, Jiangsu Province 214122, PR China.
authors: Yu-Ping
authors: YP
authors: Wang
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China.
authors: Yan-Ling
authors: YL
authors: Qiu
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China. Electronic address: guorb@qibebt.ac.cn.
authors: Rong-Bo
authors: RB
authors: Guo
authors: Key Laboratory of Biofuels, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 189 Songling Road, Qingdao, Shandong Province 266101, PR China.
authors: Li-Sheng
authors: LS
authors: Wang
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002264:Carboxylic Acids / Q000378:metabolism*; D003198:Computer Simulation; D056890:Eukaryota / Q000378:metabolism*; D005227:Fatty Acids / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008697:Methane / Q000378:metabolism; D008962:Models, Theoretical; D013816:Thermodynamics
chemical_list: D000596:Amino Acids; D002264:Carboxylic Acids; D005227:Fatty Acids; D008697:Methane
keywords: Anaerobic digestion model no. 1 (ADM1); Blue algae; Heat from microbiological activities; Stoichiometric coefficients of amino acids acidogenesis; Thermodynamics analysis