Ceit and Tecnun (University of Navarra), 15 Paseo Manuel de Lardizabal, San Sebastian 20018, Spain.
Ceit and Tecnun (University of Navarra), 15 Paseo Manuel de Lardizabal, San Sebastian 20018, Spain.
Bioresour Technol. 2017 Nov;244(Pt 1):1081-1088. doi: 10.1016/j.biortech.2017.07.187. Epub 2017 Aug 3.
This study explored the volatile fatty acid (VFA) production potential of seven waste streams from urban and agroindustrial sources. For that purpose, batch assays were performed under acidic (pH 5.5) and alkaline (pH 10) conditions at both mesophilic (35°C) and thermophilic (55°C) temperature. Overall, the VFA yield was influenced by temperature, and it was positively affected by pH, ranging between 220 and 677mgCODgCOD for liquid waste streams and between 127 and 611mgCODgCOD for solid waste streams and urban sludge. The highest VFA concentration and highest VFA/sCOD ratio was obtained during the organic fraction of municipal solid waste (OFMSW) fermentation, with 8,320mgCODL and 94% at alkaline pH and mesophilic temperature. The results of this study suggest that selective VFA production, i.e. via propionic, butyric and acetic acid production, might be feasible for scaling-up purposes with specific waste streams by adjusting the process parameters.
本研究探讨了七种城市和农业工业来源废物的挥发性脂肪酸（VFA）产生潜力。为此，在中温（35°C）和高温（55°C）下，在酸性（pH5.5）和碱性（pH10）条件下进行了分批试验。总体而言，VFA 产率受温度影响，受 pH 值影响呈正相关，液体废物的产率在 220 至 677mgCOD/gCOD 之间，固体废物和城市污泥的产率在 127 至 611mgCOD/gCOD 之间。在城市固体废物的有机部分（OFMSW）发酵过程中，VFA 浓度和 VFA/sCOD 比值最高，碱性 pH 值和中温条件下分别为 8320mgCODL 和 94%。本研究结果表明，通过调整工艺参数，对于特定的废物，选择性 VFA 生产（即丙酸、丁酸和乙酸生产）可能具有扩大规模的可行性。
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