Behavior and fate of copper ions in an anammox granular sludge reactor and strategies for remediation

Journal of Hazardous Materials
Zheng-Zhe ZhangRen-Cun Jin

Abstract

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 (0.24 g 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 L mg(-1)SS, respectively, thereby accelerating the external diffusion of the Cu that had accumulated in the anammox granules.

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Citations

Oct 23, 2015·Bioresource Technology·Zheng-Zhe ZhangRen-Cun Jin
May 3, 2016·Bioresource Technology·Qiong GuoRen-Cun Jin
Aug 5, 2020·Environmental Monitoring and Assessment·Rasha Maal-Bared
Jun 6, 2021·The Science of the Total Environment·Jiaxuan ZhuXin Wang
Jul 29, 2021·Journal of Hazardous Materials·Benedetta PagliacciaTommaso Lotti
Aug 10, 2021·The Science of the Total Environment·Camila Leite Madeira, Juliana Calábria de Araújo

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