确定玉米秸秆有效预处理和厌氧消化的最佳温度组合。
Determining Optimal Temperature Combination for Effective Pretreatment and Anaerobic Digestion of Corn Stalk.
机构信息
Department of Environmental Science and Engineering, Beijing University of Chemical Technology, No. 15 Beisanhuan East Road, Chaoyang District, Beijing 100029, China.
Faculty of Water Supply and Environmental Engineering, Arba Minch University, Arba Minch P.O. Box 21, Ethiopia.
出版信息
Int J Environ Res Public Health. 2022 Jun 30;19(13):8027. doi: 10.3390/ijerph19138027.
Temperature is one of the important factors affecting both chemical pretreatment and anaerobic digestion (AD) process of corn stalk (CS). In this work, the combined ways between pretreatment temperature (40 °C and 60 °C) and AD temperature (35 °C and 55 °C) were selected to investigate the AD performance for sodium hydroxide (NaOH) pretreated CS. Three organic loading rates (OLRs) of 1.6, 1.8 and 2.0 g·L·d were studied within 255 days using continuously stirred tank reactors (CSTR). The results revealed that biogas yields of CS after pretreated were higher than that of untreated groups by 36.79-55.93% and 11.49-32.35%, respectively. When the temperature of NaOH pretreatment changed from 40 °C to 60 °C, there was no significant difference in enhancing the methane yields during the three OLRs. The mesophilic AD (MAD) of CS pretreated with 2% NaOH under 40 °C and 60 °C conditions produced 275 and 280 mL·g methane yield at OLR of 1.6 g·L·d. However, as the OLR increased, the methane yield of CS under thermophilic AD (TAD) condition was further higher than under MAD condition. Furthermore, from the perspectives of energy balance and economic analysis, AD of 40 °C-treated CS recovered more energy and TAD is less expensive. Therefore, temperature of 40 °C was considered as an appropriate for pretreatment whether in mesophilic or thermophilic AD system. On the other hand, TAD was chosen as the optimal AD temperatures for higher OLRs.
温度是影响玉米秸秆（CS）化学预处理和厌氧消化（AD）过程的重要因素之一。在这项工作中，选择预处理温度（40°C 和 60°C）和 AD 温度（35°C 和 55°C）的组合方式，研究了氢氧化钠（NaOH）预处理 CS 的 AD 性能。在 255 天内，使用连续搅拌釜式反应器（CSTR）研究了三个有机负荷率（OLR），分别为 1.6、1.8 和 2.0 g·L·d。结果表明，预处理后 CS 的沼气产量比未处理组分别提高了 36.79-55.93%和 11.49-32.35%。当 NaOH 预处理温度从 40°C 升高到 60°C 时，在三个 OLR 下，甲烷产量的提高没有显著差异。在 40°C 和 60°C 条件下，用 2%NaOH 预处理的中温 AD（MAD）在 OLR 为 1.6 g·L·d 时，产生了 275 和 280 mL·g 甲烷产量。然而，随着 OLR 的增加，高温 AD（TAD）条件下 CS 的甲烷产量进一步高于 MAD 条件。此外，从能量平衡和经济分析的角度来看，40°C 处理的 CS 的 AD 回收了更多的能量，并且 TAD 的成本更低。因此，40°C 的温度被认为是中温和高温 AD 系统中进行预处理的合适温度。另一方面，TAD 被选为更高 OLR 的最佳 AD 温度。
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