Free nitrous acid breaks down extracellular polymeric substances in waste activated sludge

Zhang, Tingting, Wang, Qilin, Khan, Javaid and Yuan, Zhiguo (2015) Free nitrous acid breaks down extracellular polymeric substances in waste activated sludge. RSC Advances, 5 54: 43312-43318. doi:10.1039/c5ra06080j


Author Zhang, Tingting
Wang, Qilin
Khan, Javaid
Yuan, Zhiguo
Title Free nitrous acid breaks down extracellular polymeric substances in waste activated sludge
Journal name RSC Advances   Check publisher's open access policy
ISSN 2046-2069
Publication date 2015-01-01
Sub-type Article (original research)
DOI 10.1039/c5ra06080j
Open Access Status Not Open Access
Volume 5
Issue 54
Start page 43312
End page 43318
Total pages 7
Place of publication Cambridge, United Kingdom
Publisher Royal Society of Chemistry
Language eng
Formatted abstract
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.
Keyword Free nitrous acid (FNA)
Waste activated sludge
Extracellular polymeric substance (EPS)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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