Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment
Enhanced Biogas Yield of Chinese Herbal Medicine Extraction Residue by Hydrothermal Pretreatment
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DOI：
10.15376/biores.12.3.4627-4638
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发表时间：
2017-05
期刊：
影响因子：
1.5
通讯作者：
Ming Wang;Yan-lin Zhang;Shuiping Yan;Baojun Yi;W. Niu;Qiao-xia Yuan
中科院分区：
文献类型：
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作者：
Ming Wang;Yan-lin Zhang;Shuiping Yan;Baojun Yi;W. Niu;Qiao-xia Yuan
中草药提取残渣是我国产生的一种特殊的有机废弃物。由于CHER中木质纤维素含量较高，其生物转化效率较低。本研究探讨了水热预处理（HTP，140至220 °C，15分钟）的有机物溶解，生化甲烷潜力，甲烷化动力学的CHER在厌氧消化（AD）的效果。AD试验用5g/L总固体在35 °C下进行30 d。结果表明，HTP对CHER的增溶作用明显增强，溶解性COD（%）达到30%以上，而未处理的仅为4.5%。水解液中主要产物为乙酸、木糖和葡萄糖。甲烷产率和甲烷化速度也得到了提高。在180 °C的HTP温度下实现了306 mL/g挥发性固体的最高甲烷产率，而未处理的对照仅为175 mL/g VS。此外，在超过200 °C的HTP温度下观察到碳化现象，这导致有机物和甲烷产率的损失。
Chinese herbal medicine extraction residue (CHER) is a special organic waste produced in China. Because of the high content of lignocelluloses, CHER have a weak bioconversion efficiency for bio-products production. This study investigates the effect of a hydrothermal pretreatment (HTP, 140 to 220 °C, 15 min) on the organic matter solubilisation, biochemical methane potential, and methanation kinetics of CHER during anaerobic digestion (AD). The AD test was conducted with 5 g/L total solid at 35 °C for 30 d. The results showed that the HTP clearly improved the solubilisation of CHER, and the obtained soluble COD (%) reached over 30% (only 4.5% in untreated). Acetic acid, xylose, and glucose were found to be the main products in the hydrolysate. The methane yield and methanation speed of the treated CHER were also enhanced. The highest methane yield of 306 mL/g volatile solid was achieved at a HTP temperature of 180 °C, while the untreated control was only 175 mL/g VS. Moreover, a carbonisation phenomenon was observed at HTP temperatures over 200 °C, which resulted in a loss of organic matter and methane yield.