Hydrothermal carbonization characteristics of sewage sludge and lignocellulosic biomass. A comparative study
Hydrothermal carbonization characteristics of sewage sludge and lignocellulosic biomass. A comparative study
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DOI：
10.1016/j.biombioe.2018.11.016
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发表时间：
2019-01
影响因子：
6
通讯作者：
M. Wilk;A. Magdziarz;K. Jayaraman;M. Szymańska-Chargot;I. Gökalp
中科院分区：
文献类型：
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作者：
M. Wilk;A. Magdziarz;K. Jayaraman;M. Szymańska-Chargot;I. Gökalp
本研究评估并比较了两种木质纤维素生物质（松树和相思树）和污泥对水热碳化处理的反应。使用Zipperclave搅拌反应器，所有材料在200 °C下在水性环境中以1：8的生物质与水的比率经受HTC工艺4小时。物理，化学分析，另外，纤维，汞孔隙率分析和光学显微镜图像应用于原材料和水焦，证明HTC增强了木质纤维素生物质的能量相关性能。然而，对于污水污泥，HTC效应可以忽略不计，因为大部分碳被转移到HTC液相，这由污水污泥水热炭中的高COD和高灰分含量证实。随后，在TGA分析仪中通过非等温运行检查原材料和HTC材料的热化学转化动力学。最后，根据热重分析结果，用两种方法进行了动力学分析。由Coats & Redfern方法得到的估计表观活化能值高于Arcidius方法，该方法也给出了几乎相似的值，对该方法的准确性提出了质疑。Coats & Redfern分析给出了与木质纤维素水焦相比，污水污泥水焦的活化能值低一半。这表明HTC工艺用于产生适于与其他生物质固体燃料共燃烧或共气化的污水污泥水焦的潜力。
This study evaluates and compares the responses of two kinds of lignocellulosic biomass (pine and acacia) and sewage sludge to their hydrothermal carbonization treatment. All materials were subjected to HTC processes in an aqueous environment at 200 °C for 4 h with a 1:8 biomass to water ratio, using a Zipperclave Stirred Reactor. The physical, chemical analyses and, additionally, fibre, mercury porosimetry analyses and optical microscope images applied to both raw materials and to hydrochars, proved that HTC enhances the energy related properties of lignocellulosic biomass. Whereas, for sewage sludge, the HTC effect is negligible, because most of the carbon is transferred to the HTC liquid phase, confirmed by high COD and high ash content in the sewage sludge hydrochar. Subsequently, the thermo-chemical conversion kinetics of the raw and HTC materials were examined in the TGA analyser through nonisothermal runs. Finally, kinetics analyses were performed by two methods based on the TGA results. The estimated apparent activation energy values obtained by the Coats & Redfern method were higher than those given by the Arrhenius method, which also gave almost similar values for all samples, shedding doubt on the accuracy of this method for the current experiments. The Coats & Redfern analysis gave activation energy values which were lower by one half for sewage sludge hydrochars compared to lignocellulosic hydrochars. This indicates the potential of the HTC process for generating sewage sludge hydrochars suitable for co-combustion or co-gasification with other biomass solid fuels.