Reverse osmosis membrane autopsy in coal chemical wastewater treatment: Evidences of spatially heterogeneous fouling and organic-inorganic synergistic effect
Reverse osmosis membrane autopsy in coal chemical wastewater treatment: Evidences of spatially heterogeneous fouling and organic-inorganic synergistic effect
复制标题
煤化工废水处理中的反渗透膜尸检：空间异质污垢和有机-无机协同效应的证据
DOI：
10.1016/j.jclepro.2019.118964
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发表时间：
2020-02-10
影响因子：
11.1
通讯作者：
Huang, Xia
中科院分区：
文献类型：
--
作者：
Li, Yufang;Li, Mengchen;Huang, Xia
虽然反渗透膜污染的研究已经得到了广泛的研究，但很少有人关注的煤化工，反渗透是必不可少的水回收。废水的复杂性进一步使得无机和有机污垢物的协同机理不清楚。此外，反渗透膜组件不同部位污垢的空间异质性还有待进一步研究。本研究分析了应用于煤化工废水回用的两级反渗透模块的样品。采用扫描电子显微镜（SEM-EDS）、电感耦合等离子体发射光谱仪（ICP-OES）、X射线光电子能谱（XPS）、衰减全反射傅里叶变换红外光谱（ATR-FTIR）、激光共聚焦扫描显微镜（CLSM）、三维激发-发射矩阵（3D-EEM）和16 S测序等方法进行分析。结果表明，污垢沿元件轴向沿着逐渐减轻。从第1阶段到第2阶段，虽然有机污染一直占主导地位，但无机污染加剧，生物污染减轻，微生物多样性和种群数量下降。微生物群落结构也发生了变化，这是由于第二阶段进水的高盐度的选择性和第一阶段特定物种的拦截。此外，还为钙离子和多糖的架桥作用以及硅和有机物的协同作用提供了实验依据。本研究对真实的膜污染物进行了详细的分析，为改进煤化工污染控制策略奠定了基础。(C)2019爱思唯尔有限公司版权所有。
Although fouling on reverse osmosis (RO) membrane has been studied widely, few focused on coal chemical industry where RO is indispensable for water reclamation. The complexity of the wastewater further makes the synergistic mechanism of inorganic and organic foulants unclear. Besides, spatial heterogeneity of fouling at different positions of RO module needs more investigation. This study analyzed samples from a two-stage RO module applied in a full-scale plant for coal chemical wastewater reclamation. Scanning electron microscope equipped with energy dispersive X-ray spectrometer (SEM-EDS), inductively coupled plasma optical emission spectrometer (ICP-OES), X-ray photoelectron spectroscopy (XPS), attenuated total reflection Fourier transformed infrared spectroscopy (ATR-FTIR), confocal laser scanning microscopy (CLSM), three-dimensional excitation-emission matrix (3D-EEM) and 16S sequencing were applied. Results showed that fouling gradually mitigated along the axial direction of the elements. Additionally, from stage-1 to stage-2, although organic fouling constantly dominated, inorganic fouling was aggravated while biofouling was alleviated with declined microbial diversity and population. The structure of microbial community also varied, which was due to the selectivity of higher salinity of the 2nd stage influent and interception of particular species in the 1st stage. Moreover, experimental evidences were provided for the bridging effect of Ca2+ and polysaccharides, as well as the synergistic effect of silicon and organic matters in fouling. The detailed foulant analysis on real membrane samples in this study may lay foundation for improving fouling control strategies in coal chemical industry. (C) 2019 Elsevier Ltd. All rights reserved.