The effect of dissolved oxygen concentration on long-term stability of partial nitrification process

2020 ◽  
Vol 90 ◽  
pp. 343-351
Author(s):  
Bin Cui ◽  
Qing Yang ◽  
Xiuhong Liu ◽  
Siting Huang ◽  
Yubing Yang ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Partial Nitrification ◽  
Dissolved Oxygen Concentration ◽  
Term Stability ◽  
Long Term Stability ◽  
Nitrification Process

scholarly journals La Alcalinidad Y La Nitrificación En Una Laguna Aireada A Escala Piloto

2016 ◽  
Vol 12 (36) ◽  
pp. 89
Author(s):  
Agustín Leiva Pérez ◽  
Edison Macías Andrade ◽  
Joffre A. Andrade Candell ◽  
Ana M. Aveiga Ortiz ◽  
Sergio S. Alcívar Pinargote
Keyword(s):  
Calcium Carbonate ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Ammonium Phosphate ◽  
Pilot Scale ◽  
Process Efficiency ◽  
Dissolved Oxygen Concentration ◽  
Initial Concentration ◽  
Nitrification Process ◽  
The Relationship

It was studied the relationship among means alkalinity concentration as calcium carbonate, and the nitrification process in an aerated oxidation lagoon in batch and pilot scale (1,72 m3 as total volume and 1,46 m3 as effective one) working on a residual synthetic liquid, elaborated with base in sucrose, sulfate and ammonium phosphate. The results demonstrated that when being increased the initial alkalinity in the range from 120 to 360 mg CaCO3/dm3, the nitrification process efficiency increased significantly until the surroundings of the 86%, decreasing when being this with smaller and bigger values that said range. The dissolved oxygen concentration stayed around 4,3 mg/dm3, belonging together with the aerobic character of the microorganisms for nitrification (Nitrosomona and Nitrobacter). The initial concentration of total nitrogen in each one of the 14 processes batch was 38 mg/dm3 and the same one went down to minimum values around 4,56 mg/dm3.

Simultaneous Removal of Iron, Manganese and Ammonia from Groundwater in Single Biofilter Layer Using BAF

2011 ◽  
Vol 183-185 ◽  
pp. 442-446 ◽  
Author(s):  
Jin Xiang Fu ◽  
Jun Shang ◽  
Yu Hua Zhao
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Iron Concentration ◽  
Simultaneous Removal ◽  
Dissolved Oxygen Concentration ◽  
Efficient Removal ◽  
Nitrification Process ◽  
Aerated Filter ◽  
Iron Manganese ◽  
Water Ratio

Biological aerated filter (BAF) was employed to remove iron, manganese and ammonia from groundwater. The filter was in continuous operation under hydraulic loading of 3m3/m2.h. The influence of air-water ratio, the removal effects of iron, manganese and ammonia respective, and the oxidation of the three pollutants, the change of dissolved oxygen along the filter depth were investigated in this research. And the results was obtained, that the optimal air-water ratio was determined by 3, which made the dissolved oxygen concentration in the filter central be 4.75mg/l, and the removal of iron, manganese and ammonia be above 90%, 99% and 87%, respectively. The efficient removal of manganese occurred in the central and lower parts of the filter. More iron was oxidated at the upper 0.75m of the filter, and the oxidation velocity of manganese and ammonia would be limited, when the inlet iron concentration was higher. Nitrification process consumed more dissolved oxygen, which made dissolved oxygen concentration decrease along the filter depth from 0 to 1.25m. The demand of filtration depth is 1.6m, for simultaneous removal.

scholarly journals Long-term variability of dissolved oxygen and temperature of the upper layer of the Black sea

2019 ◽  
Vol 59 (1) ◽  
pp. 22-32
Author(s):  
A. B. Polonsky ◽  
A. A. Kotolupova
Keyword(s):  
Seasonal Variation ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Black Sea ◽  
The Black Sea ◽  
Dissolved Oxygen Concentration ◽  
Open Sea ◽  
Technical Systems ◽  
North Western

The article provides an analysis of intra- and inter-annual variability of dissolved oxygen and temperature in the upper layer of the deep-water and north-western parts of the Black Sea in the period from 1923 to 2013. The analysis is carried using the archived data from the oceanographic database of Institute of natural and technical systems. Seasonal variability of dissolved oxygen concentration and temperature is out-of-phase. In average, dissolved oxygen concentration is at a maximum at the N-W shelf in winter and is at a minimum in the open Sea in summer. The amplitude of the seasonal variations is about 50 µmol/l. In general, this is consistent with the published results on the seasonal variation in temperature. However, in some periods, lasting about 20 to 30 years, seasonal variation varies. It is due to quasi-periodical interdecadal variability of dissolved oxygen concentration which differs from one season to another and in various subregions.

scholarly journals Partial Nitrification of Wastewater from an Aminoplastic Resin Producing Factory

2005 ◽  
Vol 52 (10-11) ◽  
pp. 517-524 ◽  
Author(s):  
B. Fernández ◽  
A. Vilar ◽  
M. Ben ◽  
C. Kennes ◽  
M.C. Veiga
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Free Ammonia ◽  
Partial Nitrification ◽  
Ammonium Concentration ◽  
Dissolved Oxygen Concentration ◽  
Nitrite Oxidation ◽  
Nitrite Oxidizers

Nitrification via nitrite was studied in two aerobic reactors treating wastewater from an aminoplastic resin producing factory at HRT varying between 1.37–1.89 and 2.45–3.63 days. Both reactors were fed with concentrations of 366, 450, 1099 and 1899mg N-NH4+/L. In general in the reactor operated at a lower HRT, the nitritation percentage decreased from 87.2 to 21.6%, while the nitratation percentage remained always lower than 2.5% (except in the last period) when the ammonium concentration was increased. This behaviour could be due to the inhibition of the ammonium and nitrite oxidation produced by high free ammonia concentrations up to 179.3mg N-NH3/L. In the reactor operated at a higher HRT, the nitritation percentage decreased and the nitratation percentage increased from 88.6 to 39.6% and from 0.65 to 35.7%, respectively, due to an increase of the dissolved oxygen concentration from 0.76 to 1.02mg O2/L. However, when ammonium was fed at a concentration of 1898.7mg N-NH4+/L, the nitritation increased and the nitratation decreased, probably as a result of the accumulation of free ammonia up to 2.04mg N-NH3/L, meaning that nitrite oxidizers were inhibited. Nitrite build-up was observed after each modification of ammonium concentration in the feed.

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