Shandong Lan Xi Environmental Protection Technology Co.

Jinan, China

Shandong Lan Xi Environmental Protection Technology Co.

Jinan, China
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Wei D.,University of Jinan | Wei D.,Shandong Lan Xi Environmental Protection Technology Co. | Li M.,University of Jinan | Wang X.,University of Jinan | And 9 more authors.
Journal of Hazardous Materials | Year: 2016

The aim of this study was to evaluate the interaction between extracellular polymeric substances (EPS) and Zn (II) during the sorption process of Zn (II) onto aerobic granular sludge. Batch results showed that the adsorption rate of Zn (II) onto aerobic granular sludge was better fitted with pseudo-second order kinetics model, and the adsorption isotherm data agreed well with Freundlich equation. Extracellular polymeric substances (EPS) for Zn (II) binding during sorption process was investigated by using a combination of three-dimensional excitation-emission matrix (3D-EEM), synchronous fluorescence spectra, two-dimensional correlation spectroscopy (2D-COS) and Fourier transform infrared spectroscopy (FTIR). Results implied that the main composes of EPS, including polysaccharide (PS) and protein (PN), decreased from 5.92 ± 0.13 and 23.55 ± 0.76. mg/g SS to 4.11 ± 0.09 and 9.55 ± 0.68. mg/g SS after the addition of different doses of Zn (II). 3D-EEM showed that the intensities of PN-like substances and humic-like substances were obviously decreased during the sorption process. According to synchronous fluorescence spectra, the quenching mechanism between PN-like substances and Zn (II) was mainly caused by a static quenching process. Additionally, 2D-COS indicated that PN-like substances were more susceptible to Zn (II) binding than humic-like substances. It was also found that the main functional groups for complexation of Zn (II) and EPS were O. H groups, N. H groups and C. O stretching vibration. The findings of this study are significant to reveal the fate of heavy metal during its sorption process onto aerobic granular sludge through EPS binding, and provide useful information on the interaction between EPS and heavy metal. © 2015 Elsevier B.V.


Li K.,University of Jinan | Wei D.,University of Jinan | Wei D.,Shandong Lan Xi Environmental Protection Technology Co. | Zhang G.,University of Jinan | And 7 more authors.
Journal of Molecular Liquids | Year: 2015

In this paper, the toxicity of bisphenol A (BPA) on the performance of aerobic granular sludge was investigated in lab-scale SBRs. The result showed that exposure of BPA had an inhibition on the activities of heterotrophic bacteria and nitrifying bacteria during typical cycles. Polysaccharide (PS) and protein (PN) contents in loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) were significantly changed with the addition of BPA. Meanwhile, three-dimensional excitation-emission matrix (3D-EEM) spectroscopy and Fourier transform infrared spectroscopy (FTIR) technologies were used to characterize the chemical components of EPS in the presence of BPA. 3D-EEM indicated that the exposure of toxic BPA had a significant impact on the changes of fluorescence peak locations and intensities of LB-EPS and TB-EPS. FTIR results implied that similar functional groups were observed but with small changes, including amino group, hydroxyl group and carboxyl group. © 2015 Elsevier B.V. All rights reserved.


Wang Y.,University of Jinan | Wei D.,University of Jinan | Wei D.,Shandong Lan Xi Environmental Protection Technology Co. | Li K.,University of Jinan | And 7 more authors.
RSC Advances | Year: 2015

The objective of this study was to investigate the response of extracellular polymeric substances (EPS) to the toxicity of 2,4-dichlorophenol (2,4-DCP) in an aerobic granular sludge system. Results implied that the presence of 2,4-DCP could cause toxicity in the performance of biological nitrogen removal. Compared with the control experiment, NH4+-N removal efficiency decreased to 37.27 and 20.71% after the exposure of 2,4-DCP of 20 and 50 mg L-1, respectively. The main components of EPS, including polysaccharides and proteins, generally increased from 35.22 ± 0.69 to 38.25 ± 1.46 mg g-1 SS and 76.28 ± 0.34 to 83.30 ± 0.31 mg g-1 SS in the presence of 2,4-DCP. Three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy as well as synchronous fluorescence spectra was used to evaluate the interaction mechanism between EPS and 2,4-DCP. 3D-EEM showed that the intensities of EPS obviously decreased with the increase of 2,4-DCP concentration. According to synchronous fluorescence spectra, the mechanism of fluorescence quenching involves to static quenching with a formation constant (KA) of 3.46 × 103 L mol-1. Fourier transform infrared spectroscopy (FTIR) was used to evaluate the change of functional groups of EPS samples before and after the addition of 2,4-DCP. © The Royal Society of Chemistry 2015.

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