Exposure of activated sludge to nanosilver and silver ion: Inhibitory effects and binding to the fractions of extracellular polymeric substances
| Autor: | Ayse Gul Geyik, Ferhan Çeçen |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Carbohydrate content
Environmental Engineering Silver Time Factors 0208 environmental biotechnology Metal Nanoparticles Bioengineering 02 engineering and technology 010501 environmental sciences Inhibitory postsynaptic potential 01 natural sciences Respirometry Extracellular polymeric substance Biopolymers Oxygen Consumption Ic50 values Waste Management and Disposal Voltammetry 0105 earth and related environmental sciences Ions Chromatography Sewage Renewable Energy Sustainability and the Environment Chemistry Silver ion General Medicine 020801 environmental engineering Solutions Activated sludge Spectrophotometry Ultraviolet Extracellular Space |
| Zdroj: | Bioresource technology. 211 |
| ISSN: | 1873-2976 |
| Popis: | The main aim of the study was to determine the inhibitory effects of Ag+ and AgNP (commercial and synthesized) on activated sludge by using respirometry. Along with this aim, also the changes taking place in extracellular polymeric substances (EPS) were studied. Additionally, the binding of Ag+ or AgNP to the different fractions in EPS was assessed using voltammetry. Synthesized AgNP led to an obvious inhibition whereas commercial AgNP had no effect on activated sludge. For Ag+ and AgNP, IC50 values were found between 2.3-3.0 mg/L and 3.2-11.1 mg/L, respectively. Thus, AgNP was less inhibitory than silver ion, since the release of free silver from AgNP was very small. The protein and carbohydrate content of EPS generally increased when Ag+ was added. Both tightly-and loosely bound fractions in EPS could bind Ag+ and AgNP. Silver binding capacity of EPS was seen to depend on the molecular weight of proteins. (C) 2016 Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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