Sanitary Engineering Laboratory, School of Civil Engineering, National Technical University of Athens, 5 Iroon Polytechniou St., Zographou Campus, Athens PC 157 80, Greece.
Water Sci Technol. 2011;63(9):1906-12. doi: 10.2166/wst.2011.416.
The aim of this work was to evaluate the long-term performance of a Membrane Bioreactor (MBR) that operated continuously for 2.5 years and to assess membrane fouling and biomass activity under various operating conditions. Furthermore, a method for the characterisation of influent wastewater was developed based on its separation into various fractions. The MBR system operated at the solids retention times (SRT) of 10, 15, 20 and 33 days. The increase of SRT resulted in a decrease of the fouling rate associated with the reduction of extracellular polymeric substances. Moreover, the SRT increase resulted in a significant reduction of the Oxygen Uptake Rate (OUR) due to the lower availability of substrate and in a notable decrease of the maximum OUR since high SRT allowed the development of slower growing microorganisms. Biomass consisted of small flocs due to extensive deflocculation caused by intense aeration. Finally, the method developed for wastewater characterisation is straightforward and less time consuming than the usual method that is employed.
本工作旨在评估连续运行 2.5 年的膜生物反应器 (MBR) 的长期性能，并评估在各种操作条件下的膜污染和生物量活性。此外，还开发了一种基于废水分离成不同部分的特性描述方法。MBR 系统在固体停留时间 (SRT) 为 10、15、20 和 33 天的条件下运行。SRT 的增加导致与胞外聚合物物质减少相关的污染速率降低。此外，由于底物的可用性降低，SRT 的增加导致摄氧率 (OUR) 显著降低，并且由于高 SRT 允许生长缓慢的微生物的发展，最大 OUR 明显降低。生物量由小絮体组成，这是由于强烈曝气引起的广泛解絮。最后，开发的废水特性描述方法简单，比通常采用的方法耗时更少。
