气候变化领域集成服务门户(CCPortal): One-at-a-time sensitivity analysis of a biochemical model for carbon dioxide mass fraction in an aerobic lysimeter

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DOI	10.5276/JSWTM/2019.162
	One-at-a-time sensitivity analysis of a biochemical model for carbon dioxide mass fraction in an aerobic lysimeter
	Mudhoo A.; Mohee R.; Gurjar B.R.
发表日期	2019
ISSN	10881697
起始页码	162
结束页码	174
卷号	45 期号:2
英文摘要	A zero-order model was worked out to predict and analyze the time variation of carbon dioxide mass fraction in an aerated bioreactor landfill lysimeter. This model embodies substrates specific utilization and microbial growth kinetics instead of the typical Monod's kinetics. Substrates found in biodegradable substrates have been grouped as 'slowly degradable', 'moderately degradable' and 'rapidly degradables'. Biodegradation-induced settlement following mechanical compression has also been considered. The solutions to non-stiff equations for the substrates degradation kinetics and microbial growth kinetics were obtained using the ode45 tool in Matlab which is based on the fourth and fifth order explicit Runge-Kutta approximations. Errors in the iterations and approximations were kept to a minimum using an 'adaptive time step' method. Simulations were performed with a multi-input-single-output structure for the model. Sensitivity analyses were performed on the model in order to prioritize the more pertinent parameters. Qualitatively, all simulated CO2 mass fraction temporal variation profiles gave similar trends with an initial sharp rise to a peak value before a dip over the first 50 to 100 days followed by stabilization to a quasi-constant value. Cross-validation showed moderate consistency between the quantitative simulation results for mass fraction of CO2 with the very scanty similar empirical datasets. The local sensitivity analysis indicated that the initial fraction of degradable components, matrix porosity, tortuosity factor arising from the gas phase saturation and the mass flow rate of air were the most important parameters influencing the peak mass fraction of CO2. The local sensitivity analysis leads to recommend that an air injection rate of 2-4×10-5 kg/s in a bioreactor landfill lysimeter of internal radius 0.2 m with a matrix of solid wastes having an initial fraction of degradable components of 30-60% and an average bulk porosity of 20-40% may keep CO2 emissions upto 35% (mass fraction). Widener University School of Civil Engineering. All rights reserved.
英文关键词	Bioreactor landfill; Carbon dioxide; Gas profiles; Modeling; Sensitivity analyses
scopus关键词	Biochemistry; Biodegradation; Bioreactors; Carbon dioxide; Degradation; Growth kinetics; Kinetics; Land fill; Lysimeters; MATLAB; Models; Porosity; Runge Kutta methods; Soil surveys; Bioreactor landfill; Degradation kinetics; Gas phase saturation; Local sensitivity analysis; Mass flow rate of air; Mechanical compression; Multi input single outputs; Quantitative simulation; Sensitivity analysis
来源期刊	Journal of Solid Waste Technology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176535
作者单位	Department of Chemical and Environmental Engineering, Faculty of Engineering, University of Mauritius, Réduit, 80837, Mauritius; University of Mauritius, Réduit, 80837, Mauritius; Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
推荐引用方式 GB/T 7714	Mudhoo A.,Mohee R.,Gurjar B.R.. One-at-a-time sensitivity analysis of a biochemical model for carbon dioxide mass fraction in an aerobic lysimeter[J],2019,45(2).
APA	Mudhoo A.,Mohee R.,&Gurjar B.R..(2019).One-at-a-time sensitivity analysis of a biochemical model for carbon dioxide mass fraction in an aerobic lysimeter.Journal of Solid Waste Technology and Management,45(2).
MLA	Mudhoo A.,et al."One-at-a-time sensitivity analysis of a biochemical model for carbon dioxide mass fraction in an aerobic lysimeter".Journal of Solid Waste Technology and Management 45.2(2019).