Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore.
Centre for Water Research, Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore; National University of Singapore Environmental Research Institute, 5A Engineering Drive 1, 117411, Singapore.
Water Res. 2021 Sep 15;203:117521. doi: 10.1016/j.watres.2021.117521. Epub 2021 Aug 6.
Two crucial themes emerge from the growing application of MBRs treating domestic wastewater so far: fouling control and energy demand. The significance of in-situ shear-enhanced methods for fouling control in MBRs has been widely acknowledged with air sparging over decades. However, it is still a challenge to develop energy-efficient ways to replace energy-intensive air sparging for effective fouling control during long-term real domestic wastewater treatment. A novel vibrating flat-sheet ceramic MBR (VMBR) was established for investigating the effects of different shear rates on treatment performance, fouling control and specific energy demand compared with air-sparging MBR (ASMBR). Three levels of shear rates with vibration speed of 120, 80, and 40 RPM in the VMBR, versus specific aeration rate of 1.5, 1.0 and 0.5 LPM in the ASMBR were examined as high-, middle- and low-shear phases. Results showed that the VMBR removed over 78.35% TOC, 89.89% COD and 99.9% NH-N over three phases, and retarded initial increases in transmembrane pressure to control membrane fouling effectively with average fouling rate around 2.31 kPa/d, 3.59 kPa/d and 10.15 kPa/d, almost 70% lower than the ASMBR in Phase 1, 2 and 3, respectively. Particle size distribution of mixed liquor revealed that colloids and biopolymer clusters were significantly reduced in the VMBR showing less propensity for foulant formation. DOM characteristics further indicated that lower production of polysaccharides and protein (by approximately half in Phases 1 and 2) of SMP and EPS in the VMBR generated lower biopolymer content, promoting better fouling mitigation and enhanced dewaterability compared to the ASMBR. Moreover, the VMBR showed superior energy efficiency for fouling control and could save 51.7% to 78.5% energy of the ASMBR under similar-shear condition. The combination of excellent treatment performance, fouling control and energy efficiency from the VMBR makes this an attractive strategy for future improvement of MBR designs in full-scale application with the potential to replace conventional ASMBR.
从目前应用 MBR 处理生活污水的情况来看，有两个关键主题：一是污染控制，二是能源需求。几十年来，空气曝气技术已被广泛认为是增强 MBR 中污染控制的原位剪切增强方法的重要手段。然而，开发节能的方法来替代能源密集型的空气曝气以实现长期实际生活污水处理中的有效污染控制仍然是一个挑战。建立了一种新型振动平板陶瓷膜生物反应器（VMBR），用于研究不同剪切速率对处理性能、污染控制和比能耗的影响，与空气曝气膜生物反应器（ASMBR）相比。在 VMBR 中，振动速度分别为 120、80 和 40 RPM 时，有三个剪切速率水平，而 ASMBR 中的特定曝气率分别为 1.5、1.0 和 0.5 LPM，作为高、中、低剪切阶段进行了检查。结果表明，VMBR 在三个阶段去除了超过 78.35%的 TOC、89.89%的 COD 和 99.9%的 NH-N，有效地延缓了初始跨膜压力的增加，从而控制膜污染，平均污染率约为 2.31、3.59 和 10.15 kPa/d，分别比第 1、2 和 3 阶段的 ASMBR 低约 70%。混合液的颗粒尺寸分布表明，VMBR 中胶体和生物聚合物聚集体明显减少，形成污垢的倾向较小。DOM 特性进一步表明，VMBR 中 SMP 和 EPS 的多糖和蛋白质（第 1 和第 2 阶段减少了一半左右）产量较低，产生的生物聚合物含量较低，与 ASMBR 相比，可更好地减轻污染和改善脱水性能。此外，在相似剪切条件下，VMBR 具有优越的污染控制节能性能，可节省 ASMBR 的 51.7%至 78.5%的能源。VMBR 在处理性能、污染控制和能源效率方面的卓越表现，使其成为未来在全规模应用中改进 MBR 设计的一种有吸引力的策略，有可能取代传统的 ASMBR。
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