Effects of free ammonia and dissolved oxygen on nitrification and nitrite accumulation in a biofilm airlift reactor

2005 ◽  
Vol 22 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Dong-Jin Kim ◽  
Dae Hee Ahn ◽  
Dong-Ig Lee
Keyword(s):  
Dissolved Oxygen ◽  
Airlift Reactor ◽  
Free Ammonia ◽  
Nitrite Accumulation

scholarly journals Response of nitrite accumulation and microbial community to free ammonia and dissolved oxygen treatment of high ammonium wastewater

2016 ◽  
Vol 100 (9) ◽  
pp. 4177-4187 ◽  
Author(s):  
Qianwen Sui ◽  
Chong Liu ◽  
Junya Zhang ◽  
Hongmin Dong ◽  
Zhiping Zhu ◽  
...  
Keyword(s):  
Microbial Community ◽  
Dissolved Oxygen ◽  
Free Ammonia ◽  
Nitrite Accumulation ◽  
Oxygen Treatment

scholarly journals Enhanced nitrite accumulation under mainstream conditions by a combination of free ammonia-based sludge treatment and low dissolved oxygen: reactor performance and microbiome analysis

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 2049-2059 ◽  
Author(s):  
Heng Yu ◽  
Zhiyong Tian ◽  
Jiane Zuo ◽  
Yonghui Song
Keyword(s):  
Dissolved Oxygen ◽  
Free Ammonia ◽  
Nitrite Accumulation ◽  
Reactor Performance ◽  
Sludge Treatment ◽  
Low Dissolved Oxygen ◽  
Microbiome Analysis ◽  
Side Stream ◽  
Low Do

An introduction of the combination of side-stream sludge treatment using FA and low DO could more effectively enhance nitrite accumulation than single low DO.

Nitrification of high strength ammonia wastewater and nitrite accumulation characteristics

2003 ◽  
Vol 47 (11) ◽  
pp. 45-51 ◽  
Author(s):  
D.J. Kim ◽  
J.S. Chang ◽  
D.I. Lee ◽  
D.W. Han ◽  
I.K. Yoo ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Deficiency ◽  
Biofilm Reactor ◽  
Free Ammonia ◽  
Limiting Factor ◽  
Nitrite Accumulation ◽  
Ammonium Oxidation ◽  
Nitrite Oxidation ◽  
Ammonia Inhibition ◽  
Nitrite Oxidizers

Biological nitrogen removal via the nitrite pathway in wastewater treatment is very important in saving the cost of aeration and as an electron donor for denitrification. Wastewater nitrification and nitrite accumulation were carried out in a biofilm airlift reactor with autotrophic nitrifying biofilm. The biofilm reactor showed almost complete nitrification and most of the oxidized ammonium was present as nitrite at the ammonium load of 1.5 to 3.5 kg N/m3·d. Nitrite accumulation was stably achieved by the selective inhibition of nitrite oxidizers with free ammonia and dissolved oxygen limitation. Stable 100% conversion to nitrite could also be achieved even under the absence of free ammonia inhibition on nitrite oxidizers. Batch ammonium oxidation and nitrite oxidation with nitrite accumulating nitrifying biofilm showed that nitrite oxidation was completely inhibited when free ammonia is higher than 0.2 mg N/L. However, nitrite oxidation activity was recovered as soon as the free ammonia concentration was below the threshold level when dissolved oxygen concentration was not the limiting factor. Fluorescence in situ hybridization analysis of cryosectioned nitrite accumulating nitrifying biofilm showed that the β-subclass of Proteobacteria, where ammonia oxidizers belong, was distributed outside the biofilm whereas the α-subclass of Proteobacteria, where nitrite oxidizers belong, was found mainly in the inner part of the biofilm. It is likely that dissolved oxygen deficiency or limitation in the inner part of the nitrifying biofilm, where nitrite oxidizers exist, is responsible for the complete shut down of the nitrite oxidizers activity under the absence of free ammonia inhibition.

Reoxygenation Rate for Airlift Inner Circulation Reactor

2013 ◽  
Vol 726-731 ◽  
pp. 1926-1929
Author(s):  
Ke Wu Pi ◽  
Min Xia ◽  
Shi Shi ◽  
Qu Xiao
Keyword(s):  
Dissolved Oxygen ◽  
Aeration Rate ◽  
Airlift Reactor ◽  
Liquid Level ◽  
Aeration Tank ◽  
Do Concentration

Airlift inner circulation reactor (AICR) consisting of beaker and built-in aeration tank was introduced in this paper. The Dissolved oxygen recovery (RDO) was highly influenced by the ratios of the height of built-in aeration tank to the height of liquid level in reactor (Rh/H), the diameter of built-in aeration tank to the diameter of the reactor (Rd/D) and aeration rate (QN). Average RDO of 24.25 m.gm-3.s-s and DO concentration of 8.97mg.l-1 were obtained at Rd/D=0.47, Rh/H=0.68 and QN =1.0m3.m-3.min-1 for aerating 370s at 17°C. The total transferred oxygen in 4L deoxidized water reached 35.89mg, which had an increase by 11.15% than that of the traditional airlift reactor (AR). The DO concentration was 88.33-9.34mg.l-1 for AICR, but it’s only 7.71-8.58mg.l-1 for AR.

Achieving nitrogen removal via nitrite pathway from urban landfill leachate using the synergetic inhibition of free ammonia and free nitrous acid on nitrifying bacteria activity

2013 ◽  
Vol 68 (9) ◽  
pp. 2035-2041 ◽  
Author(s):  
H. W. Sun ◽  
Y. Bai ◽  
Y. Z. Peng ◽  
H. G. Xie ◽  
X. N. Shi
Keyword(s):  
Landfill Leachate ◽  
Biological System ◽  
Nitrous Acid ◽  
Free Ammonia ◽  
Nitrifying Bacteria ◽  
Anaerobic Sludge ◽  
Nitrite Accumulation ◽  
Fish Analysis ◽  
Ammonia Oxidizing Bacteria ◽  
Free Nitrous Acid

In this study, a biological system consisting of an up-flow anaerobic sludge blanket (UASB) and anoxic–oxic (A/O) reactor was established for the advanced treatment of high ammonium urban landfill leachate. The inhibitory effect of free ammonia (FA) and free nitrous acid (FNA) on the nitrifying bacterial activity was used to achieve stable nitritation in the A/O reactor. The results demonstrated that the biological system achieved chemical oxygen demand (COD), total nitrogen (TN) and NH4+-N removal efficiencies of 95.3, 84.6 and 99.2%, respectively at a low carbon-to-nitrogen ratio of 3:1. Simultaneous denitritation and methanogenesis in the UASB could improve the removal of COD and TN. Nitritation with above 90% nitrite accumulation was successfully achieved in the A/O reactor by synergetic inhibition of FA and FNA on the activity of nitrite oxidizing bacteria (NOB). Fluorescence in situ hybridization (FISH) analysis showed that ammonia oxidizing bacteria (AOB) was dominant and was considered to be responsible for the satisfactory nitritation performance.

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