Environmental Research Group for Resource Recovery, Department of Civil Engineering, Faculty of Engineering, Architecture and Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada.
Department of Chemistry and Biology, Faculty of Science, Ryerson University, 350 Victoria Street, Toronto, Ontario, M5B 2K3, Canada; School of Environmental Studies, Queen's University, Kingston, ON, K7L 3N6, Canada; Department of Microbiology, Stellenbosch University, Private Bag, XI, Matieland, 7602, Stellenbosch, South Africa.
Chemosphere. 2022 Dec;308(Pt 3):136363. doi: 10.1016/j.chemosphere.2022.136363. Epub 2022 Sep 7.
This study investigated the impact of the solid sludge content concentrations (SC) on hydrothermal pretreatment (HTP) before fermentation and anaerobic digestion. Five different SC of 3.5%, 7%, 10%, 12%, and 16% were investigated in two different scenarios. The first scenario entailed using only the pretreated samples as substrates, whereas in scenario two, the substrates included pretreated samples combined with the supernatant. Results revealed that the highest overall pCOD solubilization (considering HTP and fermentation) of 64% was achieved for the sample with 12% SC combined with supernatant. The maximum volatile fatty acids production of 2.8 g COD/L occurred with 10% SC without supernatant. The maximum methane yield of 291 mL CH/g VSS added was attained at 7% SC without supernatant. Furthermore, the results indicated that increasing the SC beyond 7% in scenario 1 and 10% in scenario two led to a decrease in methane yield. Additionally, optimizing for all desired endpoints may be difficult, and there are limits on the increase in SC concerning methane production.
本研究探讨了固含量浓度（SC）对发酵和厌氧消化前水热预处理（HTP）的影响。在两种不同的情况下，研究了 3.5%、7%、10%、12%和 16%五种不同的 SC。第一种情况仅使用预处理后的样品作为底物，而第二种情况则包括预处理后的样品与上清液的混合物。结果表明，对于 12% SC 与上清液组合的样品，总 pCOD 溶解率（考虑 HTP 和发酵）最高，达到 64%。在没有上清液的情况下，10% SC 产生的最大挥发性脂肪酸产量为 2.8 g COD/L。在没有上清液的情况下，7% SC 的最大甲烷产率为 291 mL CH/g VSS 添加。此外，结果表明，在情况 1 中 SC 超过 7%，在情况 2 中 SC 超过 10%，会导致甲烷产量下降。此外，针对所有期望的终点进行优化可能较为困难，并且甲烷生产方面 SC 的增加也存在限制。
