Fang Peixiang, He Xinlin, Li Junfeng, Yang Guang, Wang Zhaoyang, Sun Zhihua, Zhang Xuan, Zhao Chun
College of Water Conservancy and Architectural Engineering, Shihezi University , Shihezi , People's Republic of China.
Key Laboratory of Modern Water-Saving Irrigation of the Xinjiang Production and Construction Corps , Shihezi , People's Republic of China.
Environ Technol. 2019 Sep;40(23):3105-3113. doi: 10.1080/09593330.2018.1466919. Epub 2018 May 15.
The long-term and short-term effects of salinity on the multivalent metal ions within extracellular polymeric substance (EPS) were investigated in this study. The results indicated that the Na content within the EPS increased significantly from 19.53% to 60.86% under high salinity, and this content in the saline system was 2.2 times higher than that of the control system at the end of the operation. The K, Ca and Mg contents within the EPS decreased from 33.85%, 39.19% and 5.54% to 7.07%, 25.64% and 3.28%, respectively, when the salinity was increased from 0 g/L to 30 g/L. These ions were replaced by Na through ion exchange and competing ionic binding sites under salt stress. The interaction between divalent metal ions and Na was reversible with the adaption of anammox to salinity. Salinity exhibited a limited influence on the Fe within the EPS. Sludge granulation was inhibited under conditions of high salinity due to the replacement of multivalent metal ions by Na.
本研究考察了盐度对胞外聚合物（EPS）中多价金属离子的长期和短期影响。结果表明，在高盐度条件下，EPS中的钠含量从19.53%显著增加到60.86%，运行结束时，盐系统中的该含量比对照系统高2.2倍。当盐度从0 g/L增加到30 g/L时，EPS中的钾、钙和镁含量分别从33.85%、39.19%和5.54%降至7.07%、25.64%和3.28%。在盐胁迫下，这些离子通过离子交换和竞争离子结合位点被钠取代。随着厌氧氨氧化对盐度的适应，二价金属离子与钠之间的相互作用是可逆的。盐度对EPS中的铁影响有限。由于多价金属离子被钠取代，在高盐度条件下污泥颗粒化受到抑制。
