Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications

Zhang, Tingting, Wang, Qilin, Ye, Liu and Yuan, Zhiguo (2016) Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications. Chemical Engineering Journal, 290 31-36. doi:10.1016/j.cej.2016.01.028

Author Zhang, Tingting
Wang, Qilin
Ye, Liu
Yuan, Zhiguo
Title Effect of free nitrous acid pre-treatment on primary sludge biodegradability and its implications
Journal name Chemical Engineering Journal   Check publisher's open access policy
ISSN 1385-8947
Publication date 2016-04-15
Sub-type Article (original research)
DOI 10.1016/j.cej.2016.01.028
Open Access Status Not Open Access
Volume 290
Start page 31
End page 36
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2017
Language eng
Formatted abstract
Free nitrous acid (FNA i.e. HNO2) pre-treatment has been demonstrated to be effective in enhancing methane production from waste activated sludge (WAS). In some wastewater treatment plants (WWTPs), primary sludge (PS) and WAS are commonly mixed and digested simultaneously in the anaerobic digester. In order to reveal whether and how the PS and WAS should be jointly treated by FNA in WWTPs, this study presents the effects and mechanisms of FNA pre-treatment on methane production from PS. Full-scale derived PS was pre-treated with FNA at concentrations of 0–3.85 mg N/L followed by biochemical methane potential (BMP) tests. FNA treated PS was centrifuged to separate the supernatant from the solid phase for BMP tests on both fractions. FNA pre-treatment resulted in the methane potential reduction of 1–7%. The methane production from both supernatant and solid phases also decreased. PS solubilisation in combination with the molecular weight distribution and chemical structure analysis of the soluble phase showed very limited release of readily biodegradable substances from PS with FNA pre-treatment. The fact that FNA pre-treatment compromised the methane production from PS indicates that FNA-based sludge pre-treatment technology should implemented solely on WAS to maximise the methane production from the two sludge streams.
Keyword BMP
FNA pre-treatment
Methane production
Primary sludge
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
HERDC Pre-Audit
Advanced Water Management Centre Publications
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Citation counts: TR Web of Science Citation Count  Cited 1 times in Thomson Reuters Web of Science Article | Citations
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