TY - JOUR
T1 - Free nitrous acid breaks down extracellular polymeric substances in waste activated sludge
AU - Zhang, Tingting
AU - Wang, Qilin
AU - Khan, Javaid
AU - Yuan, Zhiguo
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2015
Y1 - 2015
N2 - Free nitrous acid (FNA) has been demonstrated to be effective in enhancing the degradability of waste activated sludge (WAS). Considering that extracellular polymeric substances (EPS) are a major component in sludge flocs, the chemical breakdown of EPS components by FNA has been hypothesized to account for the improvement of sludge biodegradability in addition to enhanced cell lysis. EPS extracted from WAS was treated with FNA at 2.0 mg HNO2-N per L (260 mg NO2--N per L and pH 5.5). The molecular weight distribution of EPS showed the breakdown of macromolecules into smaller molecules. The chemical structure analysis of EPS using Fourier transform infrared spectroscopy ascribed the breakdown to FNA-induced deamination of proteins, amino sugars and nucleic acids, implying that the main targets of FNA in EPS are protein-like substances. Particle size distribution analysis on the original WAS with the same FNA treatment revealed that FNA treatment of sludge significantly reduces the flocs sizes, which supported that FNA breaks down EPS in activated sludge flocs. © The Royal Society of Chemistry 2015.
AB - Free nitrous acid (FNA) has been demonstrated to be effective in enhancing the degradability of waste activated sludge (WAS). Considering that extracellular polymeric substances (EPS) are a major component in sludge flocs, the chemical breakdown of EPS components by FNA has been hypothesized to account for the improvement of sludge biodegradability in addition to enhanced cell lysis. EPS extracted from WAS was treated with FNA at 2.0 mg HNO2-N per L (260 mg NO2--N per L and pH 5.5). The molecular weight distribution of EPS showed the breakdown of macromolecules into smaller molecules. The chemical structure analysis of EPS using Fourier transform infrared spectroscopy ascribed the breakdown to FNA-induced deamination of proteins, amino sugars and nucleic acids, implying that the main targets of FNA in EPS are protein-like substances. Particle size distribution analysis on the original WAS with the same FNA treatment revealed that FNA treatment of sludge significantly reduces the flocs sizes, which supported that FNA breaks down EPS in activated sludge flocs. © The Royal Society of Chemistry 2015.
UR - http://www.scopus.com/inward/record.url?scp=84929598405&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-84929598405&origin=recordpage
U2 - 10.1039/c5ra06080j
DO - 10.1039/c5ra06080j
M3 - RGC 21 - Publication in refereed journal
SN - 2046-2069
VL - 5
SP - 43312
EP - 43318
JO - RSC Advances
JF - RSC Advances
IS - 54
ER -
