期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 300, 期 -, 页码 838-846出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2015.08.024
关键词
Anammox; Copper inhibition; Remediation strategy; Extracellular polymeric substances; Metal fractions
资金
- Natural Science Foundation of China [51278162]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates [201410346017]
- National Key Technologies R&D Program of China [2012BAC13B02]
- Xinmiao Talent Program of Zhejiang Province [2015R423074]
- Xingguang Program of Hangzhou Normal University
In this study, the behavior, distribution and form dynamics of overloaded Cu(II) in anaerobic ammonium oxidation (anammox) granular sludge reactors were investigated. The performance and physiological characteristics were tracked by continuous-flow monitoring to evaluate the long-term effects. High Cu loading (0.24g L-1 d(-1)) exceeded sludge bearing capacity, and precipitation dominated the removal pathway. The Cu distribution migrated from the extracellular polymeric substances-bound to the cell-associated Cu and the Cu forms shifted from the weakly bound to strongly bound fractions over time. Pearson correlation and fluorescence spectra analyses showed that the increase in protein concentrations in the EPS was a clear self-defense response to Cu(II) stress. Two remediation strategies, i.e., ethylenediamine tetraacetic acid (EDTA) washing and ultrasound-enhanced EDTA washing, weakened the equilibrium metal partition coefficient from 5.8 to 0.45 and 0.34 Lmg(-1) SS, respectively, thereby accelerating the external diffusion of the Cu that had accumulated in the anammox granules. (C) 2015 Elsevier B.V. All rights reserved.
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