Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, Xanthi GR67100, Greece.
Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, Xanthi GR67100, Greece.
Waste Manag. 2018 Jun;76:357-363. doi: 10.1016/j.wasman.2018.02.032. Epub 2018 Feb 21.
Slaughterhouse solid wastes, characterized by a high lipid content, are considered a valuable resource for energy production by means of anaerobic digestion technologies. Aim of this study was to examine the effect of trace element limitation on the mesophilic anaerobic digestion of thermally pre-treated emulsified slaughterhouse wastes (TESW). Under two distinct experimental periods (Period I - low and Period II - high trace element dosage respectively) a CSTR with sludge recirculation was operated at increasing organic loading rate (OLR) from 1.5 to 10 g L d. Under optimum conditions, COD removal was higher than 96%, biogas yield equal to 0.53 L g COD feed and the biogas methane content 77%. Trace element limitation however, resulted in a dramatic decline in process efficiency, with VFA accumulation and events of extreme sludge flotation, despite that the soluble concentration of Ni, Co and Mo were between 12 and 28 μg L. This is indicative of mass transfer limitations caused by lipids adsorption onto the anaerobic biomass.
屠宰场固体废物的特点是脂质含量高，被认为是通过厌氧消化技术生产能源的有价值资源。本研究的目的是研究微量元素限制对热预处理乳化屠宰废物（TESW）的中温厌氧消化的影响。在两个不同的实验期（第 I 期-低微量元素剂量和第 II 期-高微量元素剂量）下，带有污泥回流的 CSTR 在不断增加的有机负荷率（OLR）下从 1.5 增加到 10 g L d 运行。在最佳条件下，COD 去除率高于 96%，沼气产率等于 0.53 L g COD 进料，沼气中甲烷含量为 77%。然而，微量元素限制导致处理效率急剧下降，出现 VFA 积累和极端污泥浮选事件，尽管 Ni、Co 和 Mo 的可溶性浓度在 12 到 28 μg L 之间。这表明由于脂肪吸附到厌氧生物量上而导致传质限制。
