Abstract

Solid-state anaerobic digestion is a promising path to optimize green energy generation from waste management. This mesophilic study investigated the performance of sodium hydroxide (4%NaOH), ammonium hydroxide (2%NH₄OH, and 4%NH₄OH), and calcium hydroxide (8%Ca(OH)₂) pretreated corn stover (Cs) co-digested with dairy manure (Dm) to achieve 4%NaCsDm, 2%AqCsDm, 4%AqCsDm, and 8%CaCsDm treatments. Results showed that 8%CaCsDm had shortened detention time (79 days) and increased methane yield (178 L/kg VS) in comparison with other treatments. In addition, propionic acid concentration in treatment 4%NaCsDm was elevated beyond a safe threshold (> 0.9 g/L) for methanogens, which is unlike the significant bioconversion that occurred for other treatments. Though, free ammonia concentration for 2%AqCsDm and 4%AqCsDm pre-digestates were within the safe limit (< 53 mg/L) relative to other treatments, 8%CaCsDm sufficiently reduced the initial inhibitory concentration to a safe threshold at the cessation of the experiment. Additionally, 8%CaCsDm treatment had the highest VFA bioconversion rate (80%). Therefore, this study demonstrated that 8%CaCsDm treatment could effectively improve reactor performance in solid-state anaerobic co-digestion.

Graphic Abstract

中文翻译：

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固态共消化碱预处理的玉米秸秆与乳牛粪反应器性能比较

摘要

固态厌氧消化是优化废物管理产生绿色能源的有前途的途径。这项嗜温性研究研究了氢氧化钠（4％NaOH），氢氧化铵（2％NH ₄ OH和4％NH ₄ OH）和氢氧化钙（8％Ca（OH）₂）与奶牛粪便（Dm）共同消化的玉米秸秆（Cs）预处理，可达到4％NaCsDm，2％AqCsDm，4％AqCsDm和8％CaCsDm处理。结果表明，与其他处理相比，8％CaCsDm缩短了滞留时间（79天）并提高了甲烷产量（178 L / kg V​​S）。此外，处理4％NaCsDm时丙酸的浓度超过了产甲烷菌的安全阈值（> 0.9 g / L），这与其他处理方法发生的显着生物转化不同。尽管相对于其他处理方法，2％AqCsDm和4％AqCsDm预先消化物的游离氨浓度在安全限度内（<53 mg / L），但8％CaCsDm足以在停止使用时将初始抑制浓度降至安全阈值。本实验。此外，8％CaCsDm处理具有最高的VFA生物转化率（80％）。因此，

图形摘要