Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, Canada.
Water Environ Res. 2021 Jan;93(1):33-41. doi: 10.1002/wer.1335. Epub 2020 Apr 26.
The performance of anaerobic membrane bioreactors (AnMBRs) at psychrophilic temperatures commonly observed in temperate climates (10-24°C) was assessed. A unique aspect of the research was operation at controlled SRT with regular membrane cleaning. COD removal and permeate VFA concentrations were similar at 15 and 24°C and deteriorated at 10°C. As temperature decreased, the COD mass flow to methane decreased and COD mass flows in the permeate and waste sludge increased. At 24°C, rapid membrane TMP increases were not observed while at 15 and 10°C rapid increases occurred at 11.7 ± 0.46 and 7.6 ± 0.45 days, respectively, indicating a greater fouling propensity of the mixed liquor at lower temperatures. When the temperature was reduced from 15°C to 10°C in a transient test, CH production was reduced and VFA concentrations increased. A 2-3 SRT lag in the responses suggested that the delayed response was due to long-term changes in microbial population. The permeate VFA content in a PAC-dosed reactor was lower than that without PAC dosing, and PAC addition increased the time to rapid TMP development to 11.3 ± 0.46 days from 7.4 ± 0.49 days. The primary benefit of PAC addition at low temperatures is enhanced membrane performance. PRACTITIONER POINTS: AnMBRs can produce high-quality effluents at temperatures of 15°C Membrane fouling increases as temperature decreases Bioreactor performance was sustained for 2-3 SRTs after temperature decrease PAC addition reduced the permeate VFA concentrations Membrane fouling at 10°C was reduced through PAC addition.
在温带气候（10-24°C）下经常观察到的低温条件下评估了厌氧膜生物反应器（AnMBR）的性能。该研究的一个独特方面是在控制 SRT 下运行并定期进行膜清洗。在 15°C 和 24°C 时，COD 去除率和渗透物 VFA 浓度相似，而在 10°C 时则恶化。随着温度的降低，甲烷的 COD 质量流减少，而渗透物和废污泥中的 COD 质量流增加。在 24°C 时，没有观察到快速的膜 TMP 增加，而在 15°C 和 10°C 时，分别在 11.7±0.46 和 7.6±0.45 天迅速增加，这表明在较低温度下混合液的污染倾向更大。当在瞬态测试中从 15°C 降低到 10°C 时，CH 产量减少，VFA 浓度增加。响应滞后 2-3 个 SRT，表明延迟响应是由于微生物种群的长期变化。投加 PAC 的反应器中的渗透物 VFA 含量低于未投加 PAC 的反应器，并且 PAC 投加将快速 TMP 发展的时间从 7.4±0.49 天延长至 11.3±0.46 天。PAC 在低温下的主要优点是增强了膜性能。从业者要点：AnMBR 可以在 15°C 的温度下产生高质量的出水。随着温度的降低，膜污染会增加。在温度降低后，生物反应器性能可以维持 2-3 个 SRT。PAC 投加降低了渗透物 VFA 浓度。通过 PAC 投加，在 10°C 时减少了膜污染。
