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DOI | 10.1016/j.watres.2012.12.013 |
Microbial kinetic model for the degradation of poorly soluble organic materials | |
Yassine, Mohamad H.1; Suidan, Makram T.2; Venosa, Albert D.3 | |
发表日期 | 2013-03-15 |
ISSN | 0043-1354 |
卷号 | 47期号:4页码:1585-1595 |
英文摘要 | A novel mechanistic model is presented that describes the aerobic biodegradation kinetics of soybean biodiesel and petroleum diesel in batch experiments. The model was built on the assumptions that biodegradation takes place in the aqueous phase according to Monod kinetics, and that the substrate dissolution kinetics at the oil/water interface is intrinsically fast compared to biodegradation kinetics. Further, due to the very low aqueous solubility of these compounds, the change in the substrate aqueous-phase concentration over time was assumed to approaches zero, and that substrate aqueous concentration remains close to the saturation level while the non-aqueous phase liquid (NAPL) is still significant. No former knowledge of the saturation substrate concentration (S-sat) and the Monod half-saturation constant (K-s) was required, as the term S-sat/(K-s + S-sat) in the Monod equation remained constant during this phase. The n-alkanes C10-C24 of petroleum diesel were all utilized at a relatively constant actual specific utilization rate of 0.01-0.02 mg-alkane/mg-biomass-hr, while the fatty acid methyl esters (FAMEs) of biodiesel were utilized at actual specific rates significantly higher with increasing carbon chain length and lower with increasing number of double bonds. The results were found to be in agreement with kinetic, genetic, and metabolic evidence reported in the literature pertaining to microbial decay rates, uptake mechanisms, and the metabolic pathway by which these compounds are assimilated into microorganisms. The presented model can be applied, without major modifications, to estimate meaningful kinetic parameters from batch experiments, as well as near source zone field application. We suggest the estimated actual microbial specific utilization rate (kC) of such materials to be a better measure of the degradation rate when compared to the maximum specific utilization rate (k), which might be orders of magnitude higher than kC and might never be observed in reality. (C) 2012 Elsevier Ltd. All rights reserved. |
英文关键词 | Biodegradation;Monod kinetics;Poorly soluble organics;Biodiesel;Petrodiesel |
语种 | 英语 |
WOS记录号 | WOS:000315977000008 |
来源期刊 | WATER RESEARCH |
来源机构 | 美国环保署 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/59183 |
作者单位 | 1.Univ Cincinnati, Environm Engn Program, Sch Energy Environm Biol & Med Engn, Cincinnati, OH 45221 USA; 2.Amer Univ Beirut, Fac Engn & Architecture, Beirut 11072020, Lebanon; 3.US EPA, Cincinnati, OH 45268 USA |
推荐引用方式 GB/T 7714 | Yassine, Mohamad H.,Suidan, Makram T.,Venosa, Albert D.. Microbial kinetic model for the degradation of poorly soluble organic materials[J]. 美国环保署,2013,47(4):1585-1595. |
APA | Yassine, Mohamad H.,Suidan, Makram T.,&Venosa, Albert D..(2013).Microbial kinetic model for the degradation of poorly soluble organic materials.WATER RESEARCH,47(4),1585-1595. |
MLA | Yassine, Mohamad H.,et al."Microbial kinetic model for the degradation of poorly soluble organic materials".WATER RESEARCH 47.4(2013):1585-1595. |
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