Free nitrous acid inhibition on anoxic phosphorus uptake and denitrification by poly-phosphate accumulating organisms

2007 ◽  
Vol 98 (4) ◽  
pp. 903-912 ◽  
Author(s):  
Yan Zhou ◽  
Maite Pijuan ◽  
Zhiguo Yuan
Keyword(s):  
Nitrous Acid ◽  
Phosphorus Uptake ◽  
Acid Inhibition ◽  
Free Nitrous Acid

scholarly journals Response of poly-phosphate accumulating organisms to free nitrous acid inhibition under anoxic and aerobic conditions

2012 ◽  
Vol 116 ◽  
pp. 340-347 ◽  
Author(s):  
Yan Zhou ◽  
Lily Ganda ◽  
Melvin Lim ◽  
Zhiguo Yuan ◽  
Wun Jern Ng
Keyword(s):  
Nitrous Acid ◽  
Acid Inhibition ◽  
Free Nitrous Acid ◽  
Aerobic Conditions

scholarly journals Effect of Free Nitrous Acid on Nitrous Oxide Production and Denitrifying Phosphorus Removal by Polyphosphorus-Accumulating Organisms in Wastewater Treatment

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Zhijia Miao ◽  
Duo Li ◽  
Shan Guo ◽  
Zhirui Zhao ◽  
Xiaofeng Fang ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Phosphorus Removal ◽  
Nitrous Acid ◽  
Phosphorus Uptake ◽  
Complete Removal ◽  
Phosphorus Metabolism ◽  
Biological Phosphorus Removal ◽  
Denitrifying Phosphorus Removal ◽  
Free Nitrous Acid ◽  
Nitrous Oxide Production

The inhibition of free nitrous acid (FNA) on denitrifying phosphorus removal has been widely reported for enhanced biological phosphorus removal; however, few studies focus on the nitrous oxide (N2O) production involved in this process. In this study, the effects of FNA on N2O production and anoxic phosphorus metabolism were investigated using phosphorus-accumulating organisms (PAOs) culture highly enriched (91±4%) inCandidatus Accumulibacter phosphatis. Results show that the FNA concentration notably inhibited anoxic phosphorus metabolism and phosphorus uptake. Poly-β-hydroxyalkanoate (PHA) degradation was completely inhibited when the FNA concentration was approximately 0.0923 mgHNO2-N/L. Higher initial FNA concentrations (0.00035 to 0.0103 mgHNO2-N/L) led to more PHA consumption/TN (0.444 to 0.916 mmol-C/(mmol-N·gVSS)). Moreover, it was found that FNA, rather than nitrite and pH, was likely the true inhibitor of N2O production. The highest proportion of N2O to TN was 78.42% at 0.0031 mgHNO2-N/L (equivalent to 42.44 mgNO2-N/L at pH 7.5), due to the simultaneous effects of FNA on the subsequent conversion of NO2into N2O and then into N2. The traditional nitrite knee point can only indicate the exhaustion of nitrite, instead of the complete removal of TN.

scholarly journals Free nitrous acid inhibition on carbon storage microorganisms: Accumulated inhibitory effects and recoverability

2016 ◽  
Vol 287 ◽  
pp. 285-291 ◽  
Author(s):  
Lily Ganda ◽  
Yan Zhou ◽  
Choon-Ping Lim ◽  
Yu Liu ◽  
Wun Jern Ng
Keyword(s):  
Carbon Storage ◽  
Nitrous Acid ◽  
Acid Inhibition ◽  
Inhibitory Effects ◽  
Free Nitrous Acid
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