Su Xinying, Zhang Zhigang
Department of Environmental Engineering, School of Food Engineering, Harbin University of Commerce, Harbin 150076, China E-mail:
Science and Technology on Underwater Acoustic Laboratory, College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China.
Water Sci Technol. 2018 Mar;77(5-6):1537-1546. doi: 10.2166/wst.2018.033.
The soluble (S), loosely bound (LB) and tightly bound (TB) extracellular polymeric substances (EPS) were extracted from sludge flocs of a membrane bioreactor to evaluate their characteristics and adsorptive fouling. The degrees of adsorptive fouling by the EPS fractions were in the order S-EPS < TB-EPS < LB-EPS. The images of atomic force microscopy showed the membrane fouled by LB-EPS was rougher than that fouled by the other fractions. The adsorbed EPS layer, which was sensed by quartz crystal microbalance with dissipation, was found to be more rigid and compact for LB-EPS, compared with the other EPS fractions. The excitation-emission matrix and Fourier transform infrared techniques were also used to characterize the individual EPS fractions. Compared with S-EPS and TB-EPS, the LB-EPS contained a larger amount of aromatic protein and less carbohydrates and lipids, exhibiting characteristics of greater aromaticity and hydrophobicity. These characteristics should be responsible for more severe fouling, and the stiffer and more compact structure of the adsorbed layer.
从膜生物反应器的污泥絮体中提取可溶性（S）、松散结合（LB）和紧密结合（TB）的胞外聚合物（EPS），以评估其特性和吸附性污垢。EPS各组分的吸附性污垢程度顺序为S-EPS < TB-EPS < LB-EPS。原子力显微镜图像显示，被LB-EPS污染的膜比被其他组分污染的膜更粗糙。通过具有耗散功能的石英晶体微天平检测到，与其他EPS组分相比，LB-EPS的吸附EPS层更坚硬且致密。激发-发射矩阵和傅里叶变换红外技术也用于表征各个EPS组分。与S-EPS和TB-EPS相比，LB-EPS含有更多的芳香族蛋白质，碳水化合物和脂质较少，表现出更高的芳香性和疏水性。这些特性应导致更严重的污垢，以及吸附层更坚硬和更致密的结构。
