Martínez E J, Gil M V, Fernandez C, Rosas J G, Gómez X
Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, León, León, Spain.
Instituto Nacional del Carbón, INCAR-CSIC, Oviedo, Asturias, Spain.
PLoS One. 2016 Apr 12;11(4):e0153139. doi: 10.1371/journal.pone.0153139. eCollection 2016.
Fat waste discarded from butcheries was used as a cosubstrate in the anaerobic codigestion of sewage sludge (SS). The process was evaluated under mesophilic and thermophilic conditions. The codigestion was successfully attained despite some inhibitory stages initially present that had their origin in the accumulation of volatile fatty acids (VFA) and adsorption of long-chain fatty acids (LCFA). The addition of a fat waste improved digestion stability and increased biogas yields thanks to the higher organic loading rate (OLR) applied to the reactors. However, thermophilic digestion was characterized by an effluent of poor quality and high VFA content. Results from spectroscopic analysis suggested the adsorption of lipid components onto the anaerobic biomass, thus disturbing the complete degradation of substrate during the treatment. The formation of fatty aggregates in the thermophilic reactor prevented process failure by avoiding the exposure of biomass to the toxic effect of high LCFA concentrations.
屠宰场丢弃的脂肪废弃物被用作污水污泥（SS）厌氧共消化的共底物。该过程在中温和高温条件下进行了评估。尽管最初存在一些抑制阶段，这些抑制阶段源于挥发性脂肪酸（VFA）的积累和长链脂肪酸（LCFA）的吸附，但共消化仍成功实现。由于应用于反应器的较高有机负荷率（OLR），脂肪废弃物的添加提高了消化稳定性并增加了沼气产量。然而，高温消化的特点是出水质量差且VFA含量高。光谱分析结果表明脂质成分吸附到厌氧生物质上，从而在处理过程中干扰了底物的完全降解。高温反应器中脂肪聚集体的形成通过避免生物质暴露于高LCFA浓度的毒性作用而防止了过程失败。
