Characteristics of extracellular polymeric substances from sludge and biofilm in a simultaneous nitrification and denitrification system under high salinity stress

The composition and distribution of extracellular polymeric substance (EPS) both from suspended sludge and attached biofilm were investigated in a simultaneous nitrification and denitrification (SND) system with the increase of the salinity from 1.0 to 3.0 %. Fourier-transform infrared (FTIR) spectr...

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Veröffentlicht in:Bioprocess and biosystems engineering 2016-09, Vol.39 (9), p.1375-1389
Hauptverfasser: Zhao, Linting, She, Zonglian, Jin, Chunji, Yang, Shiying, Guo, Liang, Zhao, Yangguo, Gao, Mengchun
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container_issue 9
container_start_page 1375
container_title Bioprocess and biosystems engineering
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creator Zhao, Linting
She, Zonglian
Jin, Chunji
Yang, Shiying
Guo, Liang
Zhao, Yangguo
Gao, Mengchun
description The composition and distribution of extracellular polymeric substance (EPS) both from suspended sludge and attached biofilm were investigated in a simultaneous nitrification and denitrification (SND) system with the increase of the salinity from 1.0 to 3.0 %. Fourier-transform infrared (FTIR) spectroscopy and three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy were used to examine proteins (PN), polysaccharides (PS) and humic substances (HS) present in EPS. High total nitrogen removal (above 83.9 %) via SND was obtained in the salinity range of 1.0–2.5 %. Total EPS in the sludge increased from 150.2 to 200.6 mg/gVSS with the increase of salinity from 1.0 to 3.0 %, whereas the corresponding values in the biofilm achieved the maximum of 288.6 mg/g VSS at 2.0 % salinity. Dominant composition of EPS was detected as HS in both sludge and biofilm, having the percentages of 50.6–68.6 and 41.1–69.9 % in total EPS, respectively. Both PN and PS contents in soluble EPS (S-EPS), loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS) of sludge and biofilm increased with the increased salinity. The FTIR spectrum and 3D-EEM fluorescence spectroscopy of S-EPS, LB-EPS and TB-EPS in the sludge and biofilm showed the changes of functional groups and conformations of the compositions in EPS with the increase of salinity. The results demonstrated that the characteristics of EPS varied from sludge to biofilm. The obtained results could provide a better understanding of the salinity effect on the EPS characteristics in a SND system.
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source MEDLINE; SpringerNature Journals
subjects Bioengineering
Biofilms
Biotechnology
Chemistry
Chemistry and Materials Science
Denitrification
Environmental Engineering/Biotechnology
Extracellular matrix
Fluorescence
Food Science
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Nitrification
Nitrogen removal
Original Paper
Polymers - chemistry
Saccharides
Salinity
Sewage - chemistry
Sludge
Spectroscopy
Spectroscopy, Fourier Transform Infrared
Stress, Physiological
title Characteristics of extracellular polymeric substances from sludge and biofilm in a simultaneous nitrification and denitrification system under high salinity stress
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