Restoration of real sewage partial nitritation-anammox process from nitrate accumulation using free nitrous acid treatment

2018 ◽  
Vol 251 ◽  
pp. 341-349 ◽  
Author(s):  
Zhibin Wang ◽  
Shujun Zhang ◽  
Liang Zhang ◽  
Bo Wang ◽  
Wenlong Liu ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Acid Treatment ◽  
Nitrate Accumulation ◽  
Free Nitrous Acid ◽  
Partial Nitritation ◽  
Anammox Process

Combining partial nitritation and heterotrophic denitritation for the treatment of landfill leachate previous to an anammox reactor

2010 ◽  
Vol 61 (8) ◽  
pp. 1949-1955 ◽  
Author(s):  
R. Ganigué ◽  
J. Gabarró ◽  
H. López ◽  
M. Ruscalleda ◽  
M. D. Balaguer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Total Nitrogen ◽  
Landfill Leachate ◽  
Nitrous Acid ◽  
Process Performance ◽  
Free Nitrous Acid ◽  
Partial Nitritation ◽  
Feed Strategy ◽  
The Stability ◽  
Conventional Systems

Landfill leachate can present extremely elevated concentrations of ammonium (up to 6,000 mg N-NH4+ L−1) and a low biodegradable organic matter fraction. As an alternative to conventional systems, this wastewater can be treated on a more sustainable way by a fully autotrophic partial nitritation–anammox system. The operation of the first step of this system, the partial nitritation, is critical since the elevated concentrations of ammonium and nitrite in the reactor can severely inhibit ammonium oxidizing bacteria (AOB) activity. In this way, the inclusion of anoxic phases during the feeding events to promote the denitrification via nitrite can be a good option for upgrading the process performance and increasing the stability of the system. This paper deals with the evaluation of an anoxic–aerobic step-feed strategy for the operation of a partial nitritation SBR. Results of this study have revealed a decrease on the total nitrogen inside the reactor of more than 200 mg N L−1 without prejudice on the partial nitritation process. Furthermore, this study has also allowed detecting an AOB activity reduction at the end of aerobic phases due to bicarbonate limitation and/or free nitrous acid inhibition.

Enhanced dewaterability of anaerobically digested sludge by in-situ free nitrous acid treatment

2020 ◽  
Vol 169 ◽  
pp. 115264 ◽  
Author(s):  
Yifu Li ◽  
Dongbo Wang ◽  
Guojing Yang ◽  
Xingzhong Yuan ◽  
Qiuxiang Xu ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
Acid Treatment ◽  
Digested Sludge ◽  
Free Nitrous Acid ◽  
Anaerobically Digested Sludge

Nitrite (not free nitrous acid) is the main inhibitor of the anammox process at common pH conditions

2013 ◽  
Vol 36 (3) ◽  
pp. 547-551 ◽  
Author(s):  
D. Puyol ◽  
J. M. Carvajal-Arroyo ◽  
R. Sierra-Alvarez ◽  
J. A. Field
Keyword(s):  
Nitrous Acid ◽  
Free Nitrous Acid ◽  
Ph Conditions ◽  
Anammox Process

Improving secondary sludge biodegradability using free nitrous acid treatment

2012 ◽  
Vol 116 ◽  
pp. 92-98 ◽  
Author(s):  
Maite Pijuan ◽  
Qilin Wang ◽  
Liu Ye ◽  
Zhiguo Yuan
Keyword(s):  
Nitrous Acid ◽  
Acid Treatment ◽  
Free Nitrous Acid ◽  
Secondary Sludge

Return-Sludge Treatment with Endogenous Free Nitrous Acid Limits Nitrate Production and N2O Emission for Mainstream Partial Nitritation/Anammox

2020 ◽  
Vol 54 (9) ◽  
pp. 5822-5831
Author(s):  
Lai Peng ◽  
Yankai Xie ◽  
Wannes Van Beeck ◽  
Weiqiang Zhu ◽  
Michiel Van Tendeloo ◽  
...  
Keyword(s):  
Nitrous Acid ◽  
N2o Emission ◽  
Free Nitrous Acid ◽  
Sludge Treatment ◽  
Partial Nitritation ◽  
Nitrate Production
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