Chemical Engineering and Environmental Technology Department, University of Valladolid, Prado de la Magdalena 47011, Valladolid, Spain E-mail:
CETaqua, Water Technology Centre, Ctra. d'Esplugues 75, 08940 Cornellà, Barcelona, Spain.
Water Sci Technol. 2014;69(9):1911-8. doi: 10.2166/wst.2014.101.
Grease waste (GW) is an adequate substrate for sewage sludge co-digestion since, coming from a waste water treatment plant, it has a high methane potential (489 NmLCH(4)/gVSin); however, no synergistic effect takes place when co-digesting with 52%VS grease. Conversely, thermal hydrolysis (TH) improves the anaerobic digestion of GW (43% higher kinetics) and biological sludge (29% more methane potential). Therefore, the application of TH to a co-digestion process was further studied. First, biochemical methane potential tests showed that the best configuration to implement the TH to the co-digestion process is pretreating the biological sludge alone, providing a 7.5% higher methane production (398 NmLCH(4)/gVSin), 20% faster kinetics and no lag-phase. Its implementation in a fed-batch operation resulted in considerable methane production (363 NmLCH(4)/gVSin) and TH improved the rheology and dewaterability properties of the digestate. This leads to important economical savings when combined with co-digestion, reducing final waste management costs and showing interesting potential for full-scale application.
油脂废物（GW）是污水污泥共消化的合适底物，因为它来自废水处理厂，具有很高的甲烷潜力（489 NmLCH4/gVSin）；然而，当与 52%VS 油脂共消化时，没有协同作用发生。相反，热水解（TH）提高了 GW（43%更高的动力学）和生物污泥（29%更高的甲烷潜力）的厌氧消化。因此，进一步研究了 TH 在共消化过程中的应用。首先，生物化学甲烷潜力测试表明，将 TH 应用于共消化过程的最佳配置是单独预处理生物污泥，可提供 7.5%更高的甲烷产量（398 NmLCH4/gVSin）、20%更快的动力学和无迟滞期。在分批进料操作中的实施导致了相当大的甲烷产量（363 NmLCH4/gVSin），并且 TH 改善了消化物的流变性和脱水性能。当与共消化结合使用时，这可带来重要的经济节省，降低最终废物管理成本，并显示出在全规模应用方面的有趣潜力。
