School of Energy & Environment, Zhongyuan University of Technology, Zhengzhou 450007, China; Cooperative Research Centre for Contamination Assessment and Remediation of Environment (CRC CARE), University of Newcastle, Callaghan, NSW 2308, Australia.
School of Energy & Environment, Zhongyuan University of Technology, Zhengzhou 450007, China.
Bioresour Technol. 2019 Dec;294:122126. doi: 10.1016/j.biortech.2019.122126. Epub 2019 Sep 6.
In this work, pyrolysis characteristics and kinetics of microalgae Diplosphaera sp. MM1 cultivated in different mediums were investigated by TG-FTIR and Py-GC/MS. Harvested MM1s biomass varied with the changing in proximate and ultimate analyses presented different weight loss behaviors. The weight loss of MM1s cultivated in dairy and winery wastewater in main pyrolysis region was ~48.4 wt% and ~52.9 wt%, respectively, and both showed secondary weight loss after 570 °C. However, MM1 harvested from BG-11 medium exhibited maximum weight loss of ~63.5 wt% and no secondary weight loss. Further, the activation energies of MM1s harvested from dairy and winery wastewater (176.3 kJ/mol and 130.4 kJ/mol, respectively) were lower than that of BG-11medium (189.4 kJ/mol). The best mechanism function for MM1s pyrolysis was third-order f(α) = (1-α). Py-GC/MS results of MM1 cultivated in winery wastewater showed highest contents of C4-C10 and C11-C21 that characterized the carbon level of gasoline and diesel, respectively, which are the major components of bio-oils.
本工作采用 TG-FTIR 和 Py-GC/MS 研究了不同介质中培养的微藻 Diplosphaera sp. MM1 的热解特性和动力学。收获的 MM1 生物质随近似分析和最终分析的变化而变化，表现出不同的失重行为。在主要热解区，从牛奶和酿酒废水中培养的 MM1 的失重分别约为 48.4wt%和 52.9wt%，两者在 570°C 后均表现出二次失重。然而，从 BG-11 培养基中收获的 MM1 表现出最大的失重约 63.5wt%，没有二次失重。此外，从牛奶和酿酒废水中收获的 MM1 的活化能（分别为 176.3kJ/mol 和 130.4kJ/mol）低于 BG-11 培养基中的活化能（189.4kJ/mol）。MM1 热解的最佳机制函数为三阶 f(α)=（1-α）。从酿酒废水中培养的 MM1 的 Py-GC/MS 结果显示出最高的 C4-C10 和 C11-C21 含量，分别表征了汽油和柴油的碳水平，这是生物油的主要成分。
