Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
Bioresour Technol. 2015 Jan;175:569-77. doi: 10.1016/j.biortech.2014.10.109. Epub 2014 Oct 28.
The oxidative thermal characteristics of two microalgae species biomass Nannochloropsis oculta and Chlorella vulgaris have been investigated. The apparent kinetic parameters for the microalgal biomass oxidation process are estimated by fitting the experimental data to the nth order rate model. Also, the iso-conversional methods Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) were used to evaluate the apparent activation energy. The results indicate that biomass of different microalgae strains exhibit different thermal behavior and characteristics. In addition, growth parameters and medium composition can affect the biomass productivity and composition. This would have significant impact on the thermal decomposition trend of the biomass. The kinetic modeling of the oxidation reaction with direct model fitting method shows good prediction to the experimental data. The apparent activation energies estimated by KAS and FWO methods for N. oculta were 149.2 and 151.8kJ/mol, respectively, while for C. vulgaris were 214.4 and 213.4kJ/mol, respectively.
研究了两种微藻（隐甲藻和普通小球藻）生物质的氧化热特性。通过将实验数据拟合到 n 级速率模型来估算微藻生物质氧化过程的表观动力学参数。此外，还使用 Kissinger-Akahira-Sunose（KAS）和 Flynn-Wall-Ozawa（FWO）等等转化率方法来评估表观活化能。结果表明，不同微藻菌株的生物质表现出不同的热行为和特性。此外，生长参数和培养基组成会影响生物质的生产力和组成。这将对生物质的热分解趋势产生重大影响。通过直接模型拟合方法对氧化反应的动力学建模显示出对实验数据的良好预测。通过 KAS 和 FWO 方法估算的 N.oculta 的表观活化能分别为 149.2 和 151.8kJ/mol，而 C.vulgaris 的则分别为 214.4 和 213.4kJ/mol。
