College of Art and Science, Northeast Agr Univ, Harbin 150030, People's Republic of China.
Huanghe S&T Univ, Inst Agr Engn, Zhengzhou 450006, People's Republic of China; Henan Agr Univ, Key Lab New Mat & Facil Rural Renewable Energy, MOA China, Zhengzhou 450002, People's Republic of China.
Sci Total Environ. 2023 Nov 1;897:165442. doi: 10.1016/j.scitotenv.2023.165442. Epub 2023 Jul 12.
In this study, the effect of cold isostatic pressure (CIP) pretreatment on the physicochemical properties and subsequent anaerobic digestion (AD) performance of corn straw (CS) was explored. The CS was subjected to CIP pretreatment by pressures of 200, 400 and 600 MPa, respectively, while AD was carried out at medium temperature (35 ± 2 °C). The results showed that CIP pretreatment disrupted the dense structure of the CS and altered the crystallinity index and surface hydrophobicity of the CS, thereby affecting the AD process. The presence of CIP pretreatment increased the initial reducing sugar concentration by 0.11-0.27 g/L and increased the maximum volatile fatty acids content by 112.82-436.64 mg/L, which facilitated the process of acidification and hydrolysis of the AD. It was also observed that the CIP pretreatment maintained the pH in the range of 6.37-7.30, maintaining the stability of the overall system. Moreover, the cumulative methane production in the CIP pretreatment group increased by 27.17 %-64.90 % compared to the control group. Analysis of the microbial results showed that CIP pretreatment increased the abundance of cellulose degrading bacteria Ruminofilibacter from 21.50 % to 27.53 % and acetoclastic methanogen Methanosaeta from 45.48 % to 56.92 %, thus facilitating the hydrolysis and methanogenic stages. The energy conversion analysis showed that CIP is a green and non-polluting pretreatment strategy for the efficient AD of CS to methane.
本研究探讨了冷等静压（CIP）预处理对玉米秸秆（CS）理化性质及后续厌氧消化（AD）性能的影响。CS 分别在 200、400 和 600 MPa 的压力下进行 CIP 预处理，而 AD 则在中温（35±2°C）下进行。结果表明，CIP 预处理破坏了 CS 的致密结构，改变了 CS 的结晶度指数和表面疏水性，从而影响了 AD 过程。CIP 预处理增加了初始还原糖浓度 0.11-0.27 g/L，并增加了最大挥发性脂肪酸含量 112.82-436.64 mg/L，这有利于 AD 的酸化和水解过程。还观察到 CIP 预处理使 pH 值保持在 6.37-7.30 范围内，维持了整个系统的稳定性。此外，与对照组相比，CIP 预处理组的累积甲烷产量增加了 27.17%-64.90%。微生物分析结果表明，CIP 预处理增加了纤维素降解菌 Ruminofilibacter 的丰度，从 21.50%增加到 27.53%，同时增加了产乙酸甲烷菌 Methanosaeta 的丰度，从 45.48%增加到 56.92%，从而促进了水解和产甲烷阶段。能量转化分析表明，CIP 是 CS 高效 AD 为甲烷的绿色、无污染预处理策略。
