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Valorization of maize silage digestate from two-stage anaerobic digestion by hydrothermal carbonization

机译：水热碳化两阶段无厌氧消化玉米青贮消化的算法

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This study proposed a novel bioeconomy concept of combining two-stage anaerobic digestion (TSAD) and hydrothermal carbonization (HTC). The maize silage digestate from the acidification reactor (AR) of the TSAD was hydrothermally carbonized at 180, 200, and 220 degrees C for 30 min. This was followed by the biogas potential test of the process water and the co-digestion test of the hydrolysate (the liquid product from the AR) and the process water (180 degrees C). The results show that higher HTC temperatures resulted in lower yield, volatile matter content, and comprehensive combustibility index of the hydrochars. The COD, TOC, and specific methane yield of the process water decreased when increasing the HTC temperature. The modified Gompertz equation successfully described the methane formation of the aqueous samples. The process water from HTC at 180 degrees C obtained the highest specific methane yield (278 mL CH4/g COD). The highest total energy recovery from hydrochar and process water (methane production) was also achieved at 180 degrees C. The co-digestion test shows the feasibility of circularly coupling TSAD and HTC, while further optimization is still needed.
机译：该研究提出了一种结合两级厌氧消化（TSAD）和水热碳化（HTC）的新型生物经济概念。从TSAD的酸化反应器（Ar）的玉米青贮消化物在180,200和220℃下水热碳化30分钟。然后是工艺水的沼气潜在试验和水解产物的共消化试验（来自Ar的液体产物）和工艺水（180℃）。结果表明，HTC温度越高导致产量下降，挥发物质含量和水质综合可燃指数。当增加HTC温度时，鳕鱼，TOC和工艺水的特定甲烷产量降低。改性的Gompertz方程成功地描述了水性样品的甲烷形成。来自HTC的原始水在180℃下获得最高特异性甲烷产率（278ml CH 4 / G COD）。在180℃下也实现了来自氢醌和工艺水（甲烷生产）的最高总能量回收。共消化试验显示圆形耦合TSAD和HTC的可行性，而仍然需要进一步优化。

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