School of Chemical Engineering, Northeast Dianli University, Jilin 132012, Jilin, PR China; Department of Civil, Environmental, and Construction Engineering, Texas Tech University, Boston, Lubbock, TX 79409-1023, USA.
School of Chemical Engineering, Northeast Dianli University, Jilin 132012, Jilin, PR China.
Bioresour Technol. 2016 Jan;200:535-40. doi: 10.1016/j.biortech.2015.10.080. Epub 2015 Oct 28.
Fouling propensity of activated sludge in membrane bioreactor (MBR) is closely related to the disturbance of a salt shock. In this work, the characteristics of membrane fouling and bioflocculation were compared in two laboratory-scale MBRs (one with calcium addition, MBR-Ca, the other without, MBR-C) with a transient salt shock. Particle size distributions, zeta potential, relative hydrophobicity, modified fouling index, the content of polysaccharides, proteins and calcium ions in different layers of sludge were monitored prior to, during and after the salt shock. Comparison with MBR-C showed that the recovery time and fouling rate of MBR-Ca were reduced by 50% and 34%, respectively. Remarkable variations of sludge properties in terms of bioflocculation, such as larger particle sizes, higher relative hydrophobicity and zeta potential, lower polysaccharides in supernatant, higher proteins/polysaccharides ratio in slime and loose bound extracellular polymeric substances, were observed in MBR-Ca after the salt shock.
膜生物反应器（MBR）中活性污泥的污染倾向与盐冲击的干扰密切相关。在这项工作中，使用两种实验室规模的 MBR（一种添加钙，MBR-Ca，另一种不添加钙，MBR-C）进行了短暂盐冲击，比较了膜污染和生物絮凝的特性。在盐冲击之前、期间和之后监测了颗粒大小分布、zeta 电位、相对疏水性、改进的污染指数、不同层污泥中多糖、蛋白质和钙离子的含量。与 MBR-C 相比，MBR-Ca 的恢复时间和污染速率分别降低了 50%和 34%。在盐冲击后，MBR-Ca 中的污泥特性发生了明显的生物絮凝变化，例如更大的颗粒大小、更高的相对疏水性和 zeta 电位、上清液中较低的多糖、污泥中更高的蛋白质/多糖比和松散结合的胞外聚合物物质。
