Characterization of interactions between a metabolic uncoupler O-chlorophenol and extracellular polymeric substances of activated sludge
| Autor: | Qian Feng, Jiashun Cao, Fang Fang, Yan-Qiu Huang, Zhang Lulu, Run-Ze Xu, Jingyang Luo, Su-Na Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
China
Sewage 010504 meteorology & atmospheric sciences Extracellular Polymeric Substance Matrix Chemistry Health Toxicology and Mutagenesis General Medicine Wastewater 010501 environmental sciences Toxicology Photochemistry 01 natural sciences Pollution Fluorescence Water Purification Matrix (chemical analysis) Activated sludge Extracellular polymeric substance Amine gas treating Sewage treatment Fourier transform infrared spectroscopy Tyrosine Chlorophenols 0105 earth and related environmental sciences |
| Zdroj: | Environmental Pollution. 247:1020-1027 |
| ISSN: | 0269-7491 |
| Popis: | Metabolic uncouplers are widely used for the in-situ reduction of excess sludge from activated sludge systems. However, the interaction mechanism between the metabolic uncouplers and extracellular polymeric substances (EPS) of activated sludge is unknown yet. In this study, the interactions between a typical metabolic uncoupler, o-chlorophenol (oCP), and the EPS extracted from activated sludge were explored using a suite of spectral methods. The binding constants calculated for the four peaks of three-dimensional excitation-emission matrix fluorescence were in a range of 1.24–1.76 × 103 L/mol, implying that the tyrosine protein-like substances governed the oCP-EPS interactions. Furthermore, the results of Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and 1H nuclear magnetic resonance indicated that the carboxyl, carbonyl, amine, and hydroxyl groups of EPS were the main functional groups involved in the formation of the oCP-EPS complex. The results of this study are useful for understanding the interactions between metabolic uncouplers and the EPS of activated sludge as well as their fates in biological wastewater treatment systems. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect