文献类型：期刊文献

英文题名：Enhanced adsorption of Zn2+ by salinity-aided aerobic granular sludge: Performance and binding mechanism

作者：Wu, Xiao[1];Li, Wei[1];Ou, Dong[1];Li, Cheng[1];Hou, Meng[1];Li, Hui[1];Liu, Yongdi[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：242

起止页码：266

外文期刊名：JOURNAL OF ENVIRONMENTAL MANAGEMENT

收录：;EI(收录号：20233314525473);WOS:【SCI-EXPANDED(收录号:WOS:000470054000030)】；

基金：This work was financially supported by the National Natural Science Foundation of China (51578240). In addition, the authors wish to acknowledge Professor James P. Shapleigh for his valuable suggestions and supports in this study.

语种：英文

外文关键词：Aerobic granular sludge; Adsorption; Heavy metals; Saline treatments; Polysaccharides

摘要：Aerobic granular sludge (AGS), which is formed by closely associating microorganisms through the production of extracellular polymeric substances (EPS), has proved to be an excellent and promising biosorbent. The re utilization of excess AGS as a kind of biosorbent would be an environmental-friendly means for heavy metal removal and reutilization of excess AGS. In this study, short-term exposure experiments were conducted to determine whether salinity (NaCl concentration ranged from 0 to 50 g/L) caused positive effects on Zn2+ adsorption performance by AGS. The results showed that the AGS formed in response to a 30 g/L saline treatment exhibited the best adsorption performance. Compared with the control (salinity of 0 g/L), the adsorptive capacity at equilibrium increased by 19.90% and reached 29.76 mg/g. The calculated maximum adsorption capacity in 30 g/L saline treatment group was 73.94 mg/g which was higher than described in previous studies using biochar, clarified sludge and aerobic granules. Analysis of EPS components suggested the enhanced adsorption of AGS might be ascribed to increasing polysaccharides content in the EPS after saline treatments. Additionally, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) results indicated hydroxyl groups of EPS played an important role in Zn2+ binding. These findings provide further insight into the application of AGS for heavy metal adsorption.