Nitrite survival and nitrous oxide production of denitrifying phosphorus removal sludges in long-term nitrite/nitrate-fed sequencing batch reactors

Wang, Yayi, Zhou, Shuai, Ye, Liu, Wang, Hong, Stephenson, Tom and Jiang, Xuxin (2014) Nitrite survival and nitrous oxide production of denitrifying phosphorus removal sludges in long-term nitrite/nitrate-fed sequencing batch reactors. Water Research, 67 33-45. doi:10.1016/j.watres.2014.08.052


Author Wang, Yayi
Zhou, Shuai
Ye, Liu
Wang, Hong
Stephenson, Tom
Jiang, Xuxin
Title Nitrite survival and nitrous oxide production of denitrifying phosphorus removal sludges in long-term nitrite/nitrate-fed sequencing batch reactors
Journal name Water Research   Check publisher's open access policy
ISSN 0043-1354
1879-2448
Publication date 2014-09-10
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.watres.2014.08.052
Open Access Status DOI
Volume 67
Start page 33
End page 45
Total pages 13
Place of publication London, United Kingdom
Publisher Elsevier
Language eng
Subject 2312 Water Science and Technology
2311 Waste Management and Disposal
2310 Pollution
2302 Ecological Modelling
2700 Medicine
Abstract Nitrite-based phosphorus (P) removal could be useful for innovative biological P removal systems where energy and carbon savings are a priority. However, using nitrite for denitrification may cause nitrous oxide (NO) accumulation and emissions. A denitrifying nitrite-fed P removal system (SBR) was successfully set up in a sequencing batch reactor (SBR) and was run for 210 days. The maximum pulse addition of nitrite to SBR was 11mg NO -N/L in the bulk, and a total of 34mg NO -N/L of nitrite was added over three additions. Fluorescent in situ hybridization results indicated that the P-accumulating organisms (PAOs) abundance was 75±1.1% in SBR, approximately 13.6% higher than that in a parallel P removal SBR using nitrate (SBR). Type II Accumulibacter (PAOII) (unable to use nitrate as an electron acceptor) was the main PAOs species in SBR, contributing 72% to total PAOs. Compared with SBR, SBR biomass had enhanced nitrite/free nitrous acid (FNA) endurance, as demonstrated by its higher nitrite denitrification and P uptake rates. NO accumulated temporarily in SBR after each pulse of nitrite. Peak NO concentrations in the bulk for SBR were generally 6-11 times higher than that in SBR; these accumulations were rapidly denitrified to nitrogen gases. NO concentration increased rapidly in nitrate-cultivated biomass when 5 or 10mg NO -N/L per pulse was added. Whereas, NO accumulation did not occur in nitrite-cultivated biomass until up to 30mg NO -N/L per pulse was added. Long-term acclimation to nitrite and pulse addition of nitrite in SBR- reduced the risk of nitrite accumulation, and mitigated NO accumulation and emissions from denitrifying P removal by nitrite.
Keyword Denitrifying phosphorus removal
Denitrifying phosphorus-accumulating organisms
Free nitrous acid
Glycogen-accumulating organisms
Nitrite
Nitrous oxide
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 51078283
51178325
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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