This study assessed the characteristics and toxicity of aqueous pyrolytic liquid (APL) derived from digested sewage sludge on anaerobic digestion (AD) and determined its rate-limiting step. Digested sewage sludge was pyrolyzed at multiple temperatures (350–650 °C) and moisture levels (0–40.4 %), resulting in APLs with varying AD toxicities. APL 350 °C-0 % showed the least toxicity, whereas APL 650 °C-40.4 % exhibited the greatest toxicity. Glucose (GL) and sodium acetate (SA) were introduced to elucidate the rate-limiting steps. SA, but not GL, enhanced APL conversion to CH4. And volatile fatty acid lack was observed in treatments without SA addition. This suggested that acidification was the primary rate-limiting step. This finding was confirmed using the modified Gompertz model: SA considerably improved the maximum methane production rate, whereas GL did not. Insights gained from this research clarified the feasibility and potential of AD for APL utilization and conversion.

中文翻译：

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将消化污泥热解中的水液用于沼气生产：表征、毒性评估和限速步骤确定


本研究评估了消化污水污泥衍生的含水热解液 （APL） 对厌氧消化 （AD） 的特性和毒性，并确定了其限速步骤。消化后的污水污泥在多个温度 （350–650 °C） 和湿度水平 （0–40.4 %） 下进行热解，导致具有不同 AD 毒性的 APL。APL 350 °C-0 % 的毒性最小，而 APL 650 °C-40.4 % 的毒性最大。引入葡萄糖 （GL） 和乙酸钠 （SA） 以阐明限速步骤。SA （而非 GL） 增强了 APL 到 CH4 的转换。在未添加 SA 的处理中观察到挥发性脂肪酸缺乏。这表明酸化是主要的限速步骤。这一发现使用改进的 Gompertz 模型得到了证实：SA 大大提高了最大甲烷产生率，而 GL 则没有。从这项研究中获得的见解阐明了 AD 在 APL 利用和转换方面的可行性和潜力。