Effect of free nitrous acid pre-treatment on primary sludge at low exposure times

Zahedi, S., Icaran, P., Yuan, Z. and Pijuan, M. (2017) Effect of free nitrous acid pre-treatment on primary sludge at low exposure times. Bioresource Technology, 228 272-278. doi:10.1016/j.biortech.2016.12.117

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Author Zahedi, S.
Icaran, P.
Yuan, Z.
Pijuan, M.
Title Effect of free nitrous acid pre-treatment on primary sludge at low exposure times
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 1873-2976
0960-8524
Publication date 2017-03-01
Sub-type Article (original research)
DOI 10.1016/j.biortech.2016.12.117
Open Access Status File (Author Post-print)
Volume 228
Start page 272
End page 278
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The present study was undertaken to investigate the effect of different free nitrous acid (FNA) concentrations at low pre-treatment times (PTs) (1, 2 and 5h) and without pH control with mild agitation on primary sludge (PS) biodegradability and methane production (MP). Increasing PTs resulted in an increase in the solubility of the organic matter (around 25%), but not on cell-mortality (>75% in all the cases with FNA) and neither on methane generation. FNA pre-treatment at low PTs improve MP (around 16% at PT of 1h and 650mg N-NO2-/L). However, a similar improvement was found with mild agitation of PS without FNA at 2 and 5h. Taking into account the potential costs associated with the FNA pre-treatment, a mild agitation without FNA would be preferred to enhance MP in PS.
Formatted abstract
The present study was undertaken to investigate the effect of different free nitrous acid (FNA) concentrations at low pre-treatment times (PTs) (1, 2 and 5 h) and without pH control with mild agitation on primary sludge (PS) biodegradability and methane production (MP). Increasing PTs resulted in an increase in the solubility of the organic matter (around 25%), but not on cell-mortality (>75% in all the cases with FNA) and neither on methane generation. FNA pre-treatment at low PTs improve MP (around 16% at PT of 1 h and 650 mg N-NO2/L). However, a similar improvement was found with mild agitation of PS without FNA at 2 and 5 h. Taking into account the potential costs associated with the FNA pre-treatment, a mild agitation without FNA would be preferred to enhance MP in PS.
Keyword Anaerobic digestion
Free-nitrous acid pre-treatment
Methane production
Primary 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
 
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