Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand.
Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Auckland, New Zealand.
Bioresour Technol. 2017 Feb;226:229-237. doi: 10.1016/j.biortech.2016.12.010. Epub 2016 Dec 5.
This study investigates oxidative and non-oxidative hydrothermal processing of cellulose at five different temperatures (180-260°C). Volatile fatty acids (VFAs) concentration, total suspended solid (TSS) degradation, dissolved organic carbon (DOC) and chemical oxygen demand (COD) were measured and compared in both processes. Moreover, the existence of hydrogen peroxide in both oxidative and non-oxidative processes was confirmed experimentally for the first time in literature. At temperatures ⩽220°C the amount of HO produced in the oxidative process was higher (50 fold) than that of in the non-oxidative while at higher temperatures (⩾240°C) it was more for non-oxidative (3.5-5 fold). The concentration of VFAs in the non-oxidative process was lower than 10% of that in oxidative process. In both processes soluble COD increased with time and temperature, however at 260°C after reaching a maximum, it decreased with time due to conversion of some soluble intermediates to CO and water.
本研究考察了纤维素在五种不同温度（180-260°C）下的氧化和非氧化水热处理。在这两种过程中，测量并比较了挥发性脂肪酸（VFAs）浓度、总悬浮固体（TSS）降解、溶解有机碳（DOC）和化学需氧量（COD）。此外，首次在文献中实验证实了过氧化氢在氧化和非氧化过程中的存在。在温度 ⩽220°C 时，氧化过程中产生的 HO 量（50 倍）高于非氧化过程，而在较高温度（⩾240°C）时，非氧化过程中产生的 HO 量（3.5-5 倍）更多。非氧化过程中 VFAs 的浓度低于氧化过程的 10%。在这两种过程中，可溶性 COD 随时间和温度的增加而增加，但是在 260°C 下，由于一些可溶性中间产物转化为 CO 和水，它在达到最大值后随时间减少。
