Low pH anaerobic digestion of waste activated sludge for enhanced phosphorous release

Latif, Muhammad A., Mehta, Chirag M. and Batstone, Damien J. (2015) Low pH anaerobic digestion of waste activated sludge for enhanced phosphorous release. Water Research, 81 288-293. doi:10.1016/j.watres.2015.05.062

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Author Latif, Muhammad A.
Mehta, Chirag M.
Batstone, Damien J.
Title Low pH anaerobic digestion of waste activated sludge for enhanced phosphorous release
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2015-06-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2015.05.062
Open Access Status File (Author Post-print)
Volume 81
Start page 288
End page 293
Total pages 6
Place of publication London, United Kingdom
Publisher I W A Publishing
Collection year 2016
Language eng
Formatted abstract
This paper assesses anaerobic digestion of waste activated sludge (WAS) at low pH to enhance phosphorous solubility. Batch biochemical methane potential tests were conducted at a pH range of 5 to 7.2 in two separate sets (two different WAS samples collected from municipal WWTP). Low pH (<5.7) caused a significant (p = 0.004) decrease in methane potential (B0) up to 33% and 3.6 times increase in phosphorus release compared to neutral pH (7–7.7), but with no major change in methane production rate coefficient (khyd). The loss in methane yield was mainly due to decrease in hydrolytic capability rather than inhibition of methanogenesis with volatile fatty acids being <300 mgCOD L−1 and soluble COD <1300 mgCOD L−1 even at low pH. While pH did not influence the acetoclastic community (Methanosaeta dominated), it was the primary driver for the remaining community (p = 0.004), and caused a loss of diversity and shift to Clostridia.
Keyword Anaerobic digestion
Phosphorus release
Community profile
Soluble COD
Batch experiments
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2016 Collection
Advanced Water Management Centre Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 9 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 9 times in Scopus Article | Citations
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Created: Thu, 18 Jun 2015, 11:05:28 EST by Mr Chirag Mehta on behalf of Advanced Water Management Centre