Gao Jian, Li Juan, Wachemo Akiber Chufo, Yuan Hairong, Zuo Xiaoyu, Li Xiujin
Department of Environmental Science and Engineering, Beijing University of Chemical Technology 15 Beisanhuan East Road, Chaoyang District Beijing 100029 PR China
Beijing Municipal Ecological and Environmental Monitoring Center 14 Chegongzhuang West Road, Haidian District Beijing 100048 PR China.
RSC Adv. 2020 Jul 23;10(46):27720-27727. doi: 10.1039/d0ra02441d. eCollection 2020 Jul 21.
A material flow analysis (MFA) method was employed to investigate elemental flow direction during the anaerobic digestion (AD) of wheat straw (WS) pretreated with potassium hydroxide. A lab-scale batch AD experiment conducted at 35 ± 1 °C was investigated to realize carbon conversion in biogas, liquid and solid digestates. The results showed that the highest growth rate of carbon conversion in biogas was observed from the fourth day to the twenty-fourth day, which accounted for 70.64%. The cumulative biogas production of WS was 531 mL g VS, along with a high volatile solids degradation rate (55.0%). The MFA results indicated that the flow mass fractions of carbon in biogas, liquid and solid digestates were 49.96%, 5.61% and 44.43%, respectively. The flow mass fraction of nitrogen in liquid and solid digestates was 45.65% and 54.35%, respectively. This study can provide a theoretical basis for elemental flow in each product from biogas projects.
采用物质流分析（MFA）方法研究了用氢氧化钾预处理的小麦秸秆（WS）厌氧消化（AD）过程中的元素流动方向。在35±1℃下进行了实验室规模的批量AD实验，以实现沼气、液体和固体消化产物中的碳转化。结果表明，从第4天到第24天，沼气中碳转化的增长率最高，占70.64%。WS的累计沼气产量为531 mL g VS，挥发性固体降解率较高（55.0%）。MFA结果表明，沼气、液体和固体消化产物中碳的流量质量分数分别为49.96%、5.61%和44.43%。液体和固体消化产物中氮的流量质量分数分别为45.65%和54.35%。本研究可为沼气工程各产物中的元素流动提供理论依据。
