Environmental Engineering Division, Department of Hydraulic, Maritime, and Environmental Engineering, Technical University of Catalonia (UPC), c/Jordi Girona 1-3, E-08034 Barcelona, Spain.
Bioresour Technol. 2010 May;101(9):2972-80. doi: 10.1016/j.biortech.2009.12.006. Epub 2010 Jan 6.
The aim of this study was to evaluate the performance of thermophilic sludge digestion at decreasing sludge retention time (SRT) and increasing organic loading rate (OLR), in terms of methane production, effluent stabilisation, hygienisation and dewaterability. Focus was put on determining indicators to help prevent process failure. To this end, a lab-scale reactor was operated for nearly 2 years at 55 degrees Celsius. Methane production rate was increased (from 0.2 to 0.4-0.6 m(3)((ch)(4)) m(-3)(reactor) d(-1)) by decreasing the SRT from 30 to 15-10 days, while increasing the OLR from 0.5 to 2.5-3.5 kg VS m(-3)(reactor) d(-1). Sludge dewaterability was worsened at SRT below 15 days; while pathogen destruction was always successful. The following concentrations might be used to prevent process failure: VFA C2-C5 (3.7 g CODL(-1)), acetate (0.6 g L(-1)), acetate/propionate (0.5), intermediate alkalinity (1.8 g CaCO(3) L(-1)), intermediate/partial alkalinity (0.9), intermediate/total alkalinity (0.5), CH(4) in biogas (55%).
本研究旨在评估高温污泥消化在降低污泥停留时间 (SRT) 和提高有机负荷率 (OLR) 方面的性能，主要关注甲烷产量、出水稳定性、卫生和脱水性能。研究重点是确定有助于防止工艺失败的指标。为此，在 55°C 下运行了一个近 2 年的实验室规模的反应器。通过将 SRT 从 30 天减少到 15-10 天，同时将 OLR 从 0.5 增加到 2.5-3.5 kg VS m(-3)(反应器)d(-1)，甲烷产率得到提高（从 0.2 增加到 0.4-0.6 m(3)((ch)(4)) m(-3)(反应器)d(-1)）。在 SRT 低于 15 天时，污泥脱水性能恶化；而病原体破坏始终是成功的。以下浓度可用于防止工艺失败：VFA C2-C5（3.7 g COD L(-1)）、乙酸（0.6 g L(-1)）、乙酸/丙酸（0.5）、中间碱度（1.8 g CaCO(3) L(-1)）、中间/部分碱度（0.9）、中间/总碱度（0.5）、沼气中的 CH(4)（55%）。
