NDLI: Kinetics and Mechanisms of Copper Sorption by Loosely Bound Extracellular Polymeric Substances (LB-EPS) from Activated Sludge under Simulating Bio-Calcification Conditions

Content Provider	IEEE Xplore Digital Library
Author	Li Juan Long Jian Kang Fuxing
Copyright Year	2010
Abstract	The behavior and fate of copper binding with extracellular polymeric substances (EPS) from activated sludge, under simulating bio-calcification, was studied. Results showed that the degree of EPS sequestering with calcium had a strong differential affect on copper sorption. At lower Ca2+ concentrations (≤80 mg•l-1), the Langmuir equation was able to model adsorptive processes between Cu2+ and EPS, which showed competitive adsorption between free Cu2+ and Ca2+ ions. However, at higher Ca2+ concentrations (>80 mg•l-1), the competitive sorption between Cu2+ and Ca2+ was replaced by bio-calcification which isolated Cu2+ from EPS. Three-dimensional fluorescence spectrum and Fourier transform-infrared spectra analysis of LB-EPS indicated that the EPS sample was composed of humic acid-like and proteins-like complexes containing proteins, polysaccharides and lipids that reacted with the investigated metal ions. Microscopic images of crystal structure and configuration, with the increase of Ca2+ concentrations, showed that calcification needles gradually grew and the aggregating EPS inchmeal dissolved. In essence, EPS are potential good for sequestering free Cu2+ from freshwaters. However in the presence of Ca2+, LB-EPS also acts as a nucleation site for bio-calcification "marl" deposition which reduces Cu2+ adsorption. Bio-lithification layer formation in combination with high calcium bio-adsorption levels significantly reduced, but did not eliminate, copper bio-adsorption in EPS.
Starting Page	1
Ending Page	5
File Size	446676
Page Count	5
File Format	PDF
ISBN	9781424447121
ISSN	21517622
DOI	10.1109/ICBBE.2010.5515091
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Proteins Calcium Microscopy Fluorescence Lipidomics Kinetic theory Copper Polymers Extracellular Equations
Content Type	Text
Resource Type	Article

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