基于城市污水污泥和未脱水隔油池废物的厌氧共消化来开发和评估甲烷潜力的模型。
Model development and evaluation of methane potential from anaerobic co-digestion of municipal wastewater sludge and un-dewatered grease trap waste.
机构信息
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
出版信息
Waste Manag. 2015 Jun;40:53-62. doi: 10.1016/j.wasman.2015.03.013. Epub 2015 Mar 26.
The performance of anaerobic co-digestion of municipal wastewater sludge with un-dewatered grease trap waste was assessed using modified biochemical methane potential tests under mesophilic conditions (35°C). Methane potentials, process inhibition and chemical behavior of the process were analyzed at different grease trap waste feed ratios on volatile solids basis. Nonlinear regression analyses of first order reaction and modified Gompertz equations were performed to assist in interpretation of the experimental results. Methane potential of un-dewatered grease trap waste was measured as 606 mL CH4/g VS(added), while methane potential of municipal wastewater sludge was only 223 mL CH4/g VS(added). The results indicated that anaerobic digestion of grease trap waste without dewatering yields less methane potential than concentrated/dewatered grease trap waste because of high wastewater content of un-dewatered grease trap waste. However, anaerobic co-digestion of municipal wastewater sludge and grease trap waste still yields over two times more methane potential and approximately 10% more volatile solids reduction than digestion of municipal wastewater sludge alone. The anaerobic co-digestion process inhibitions were reported at 70% and greater concentrated/dewatered grease trap waste additions on volatile solids basis in previous studies; however, no inhibition was observed at 100% un-dewatered grease trap waste digestion in the present study. These results indicate that anaerobic co-digestion of un-dewatered grease trap waste may reduce the inhibition risk compared to anaerobic co-digestion of concentrated/dewatered grease trap waste. In addition, a mathematical model was developed in this study for the first time to describe the relationship between grease trap waste feed ratio on volatile solids basis and resulting methane potential. Experimental data from the current study as well as previous biochemical methane potential studies were successfully fit to this relationship and allowed estimation of key performance parameters that provide additional insight into the factors affecting biochemical methane potential.
采用中温（35°C）条件下改良的生物化学甲烷潜能测试，评估了未经脱水的油脂截留废物与城市污水污泥的厌氧共消化性能。根据挥发性固体基础上的不同油脂截留废物进料比，分析了甲烷潜能、过程抑制和过程的化学行为。采用一阶反应和修正的 Gompertz 方程的非线性回归分析辅助解释实验结果。未脱水的油脂截留废物的甲烷潜能测量为 606 mL CH4/g VS（添加），而城市污水污泥的甲烷潜能仅为 223 mL CH4/g VS（添加）。结果表明，由于未经脱水的油脂截留废物含有高废水含量，因此其厌氧消化产生的甲烷潜能低于浓缩/脱水的油脂截留废物。然而，与单独消化城市污水污泥相比，城市污水污泥和油脂截留废物的厌氧共消化仍然产生超过两倍的甲烷潜能和大约 10%的挥发性固体减少。在之前的研究中，报告了在基于挥发性固体的 70%和更高浓缩/脱水的油脂截留废物添加时的厌氧共消化过程抑制；然而，在本研究中，在 100%未经脱水的油脂截留废物消化时未观察到抑制。这些结果表明，与浓缩/脱水的油脂截留废物的厌氧共消化相比，未经脱水的油脂截留废物的厌氧共消化可能降低抑制风险。此外，本研究首次建立了一个数学模型来描述基于挥发性固体的油脂截留废物进料比与产生的甲烷潜能之间的关系。当前研究以及以前的生物化学甲烷潜能研究的实验数据成功拟合到该关系，并允许估计关键性能参数，这些参数提供了对影响生物化学甲烷潜能的因素的额外深入了解。
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