scholarly journals Suppressing Nitrite-oxidizing Bacteria Growth to Achieve Nitrogen Removal from Domestic Wastewater via Anammox Using Intermittent Aeration with Low Dissolved Oxygen

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Bin Ma ◽  
Peng Bao ◽  
Yan Wei ◽  
Guibing Zhu ◽  
Zhiguo Yuan ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Domestic Wastewater ◽  
Intermittent Aeration ◽  
Low Dissolved Oxygen ◽  
Bacteria Growth ◽  
Nitrite Oxidizing Bacteria

Autotrophic nitrogen removal in sequencing batch biofilm reactors at different oxygen supply modes

2008 ◽  
Vol 58 (10) ◽  
pp. 1889-1894 ◽  
Author(s):  
C. Wantawin ◽  
J. Juateea ◽  
P. L. Noophan ◽  
J. Munakata-Marr
Keyword(s):  
Nitrogen Removal ◽  
Nitrogen Loss ◽  
Ammonia Concentration ◽  
Anammox Bacteria ◽  
Ammonia Oxidizing Bacteria ◽  
Intermittent Aeration ◽  
Biofilm Reactors ◽  
Air Supply ◽  
Nitrite Oxidizing Bacteria ◽  
Sequencing Batch Biofilm Reactors

Conventional nitrification-denitrification treatment is a common way to treat nitrogen in wastewater, but this process is costly for low COD/N wastewaters due to the addition of air and external carbon-source. However, ammonia may alternatively be converted to dinitrogen gas by autotrophic bacteria utilizing aerobically autotrophically produced nitrite as an electron acceptor under anoxic conditions. Lab-scale sequencing batch biofilm reactors (SBBRs) inoculated with normal nitrifying sludge were employed to study the potential of an oxygen-limited autotrophic nitrification-denitrification process initiated with typical nitrifying sludge for treating a synthetic ammonia wastewater devoid of organic carbon in one step. The ring-laced fibrous carrier (length 0.32 m, surface area 3.4 m2/m) was fixed vertically in a 3 L reactor. Two different air supply modes were applied:continuous aeration to control dissolved oxygen at 1.5 mg/L and intermittent aeration. High nitrogen removals of more than 50% were obtained in both SBBRs. At an ammonia loading of 0.882 gm N/m2-day [hydraulic retention time (HRT) of 24 hr], the SBBR continuously aerated to 1.5 mg DO/L had slightly higher nitrogen removal (64%) than the intermittently alternated SBBR (55%). The main form of residual nitrogen in the effluent was ammonia, at concentrations of 25 mg/L and 37 mg N/L in continuous and intermittent aeration SBBRs, respectively. Ammonia was completely consumed when ammonia loading was reduced to 0.441 gm N/m2-day [HRT extended to 48 hr]. The competitive use of nitrite by aerobic nitrite oxidizing bacteria (ANOB) with anaerobic ammonia-oxidizing bacteria (anammox bacteria) during the expanded aeration period under low remaining ammonia concentration resulted in higher nitrate production and lower nitrogen loss in the continuous aeration SBBR than in the intermittent aeration SBBR. The nitrogen removal efficiencies in SBBRs with continuous and alternating aerated were 80% and 86% respectively. Specific microorganisms in the biofilm were characterized using fluorescence in situ hybridization. Aerobic ammonia-oxidizing bacteria (AAOB) occurred side by side with putative anammox bacteria (cells hybridizing with probe AMX820) throughout the biofilm, though ANOB were rarely detected.

Intermittent Aeration for Nitrogen Removal in Small Aerated Lagoon

1993 ◽  
Vol 28 (10) ◽  
pp. 335-341 ◽  
Author(s):  
S. Koottatep ◽  
C. Leesanga ◽  
H. Araki
Keyword(s):  
Wastewater Treatment ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Intermittent Aeration ◽  
Treatment Processes ◽  
Total Nitrogen Removal ◽  
Save Energy

Intermittent aeration has been proved to be an efficient method in nitrogen removal in many biological treatment processes. Aerated lagoon has been used as domestic wastewater treatment for a small housing estates in Thailand for quite sometime. The purpose of this study is to determine whether intermittent aeration of aerated lagoon could provide efficient nitrogen removal in domestic wastewater. The experiment was carried out using pilot scale aerated lagoon at Chiangmai University. The result showed that 45% of total nitrogen removal could be achieved by aeration and non-aeration of 12 hours each cycle. The intermittent aeration did not affect organic substances removal of the process. Sludge recycle during non-aeration period may improve total nitrogen removal. The method could be introduced to save energy of small wastewater treatment plant.

Control of sludge settleability and nitrogen removal under low dissolved oxygen condition

2012 ◽  
Vol 6 (6) ◽  
pp. 884-891 ◽  
Author(s):  
Zhaoxu Peng ◽  
Yongzhen Peng ◽  
Zhenbo Yu ◽  
Xuliang Liu ◽  
Xiaoling Li ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Nitrogen Removal ◽  
Low Dissolved Oxygen ◽  
Oxygen Condition ◽  
Sludge Settleability
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