Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: effect of exposure time and concentration

Zahedi, S., Icaran, P., Yuan, Z. and Pijuan, M. (2016) Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: effect of exposure time and concentration. Bioresource Technology, 216 870-875. doi:10.1016/j.biortech.2016.06.038


Author Zahedi, S.
Icaran, P.
Yuan, Z.
Pijuan, M.
Title Assessment of free nitrous acid pre-treatment on a mixture of primary sludge and waste activated sludge: effect of exposure time and concentration
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 1873-2976
0960-8524
Publication date 2016-09-01
Year available 2016
Sub-type Article (original research)
DOI 10.1016/j.biortech.2016.06.038
Open Access Status Not yet assessed
Volume 216
Start page 870
End page 875
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2017
Language eng
Formatted abstract
Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62 mg N-HNO2/L) and three exposure times (2, 5, 9 h) lower than the ones reported in literature (24 h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5 h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49 mg N-HNO2/L) during 2 and 5 h but did not show any improvement at longer exposure times or higher FNA concentrations.
Keyword Anaerobic digestion
Free-nitrous acid pre-treatment
Methane production
Mixed sludge
Sludge biodegradability
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sun, 07 Aug 2016, 00:39:05 EST by System User on behalf of Learning and Research Services (UQ Library)