Development of single-stage nitrogen removal using anammox and partial nitritation (SNAP) and its treatment performances

2006 ◽  
Vol 53 (6) ◽  
pp. 83-90 ◽  
Author(s):  
K. Furukawa ◽  
P.K. Lieu ◽  
H. Tokitoh ◽  
T. Fujii
Keyword(s):  
Nitrogen Removal ◽  
Laser Scanning ◽  
Dna Analysis ◽  
Experimental Studies ◽  
Biofilm Reactor ◽  
Single Stage ◽  
Confocal Laser ◽  
Anammox Bacteria ◽  
Partial Nitritation ◽  
Operational Conditions

Single-stage Nitrogen removal using Anammox and Partial nitritation (SNAP) process was newly developed as an economical nitrogen removal process for ammonium rich wastewaters. The experimental studies for the evaluation of SNAP process were carried out using a novel biofilm reactor, in which hydrophilic net-type acryl fiber biomass carrier was applied. This SNAP reactor was operated under operational conditions of pH 7.5–7.7, 35 °C and DO 2–3 mg/L, and 60 to 80% of influent NH4-N was removed under loading rate of 0.48 kg-N/m3/d. Through the DNA analysis of the attached sludge, it was made clear that ammonium oxidizing bacteria (AOB) and anammox bacteria coexisted in the attach-immobilized sludge on the acryl fiber biomass carrier. Favorable conditions for the growth of anammox bacteria were created inside attach-immobilized nitrifying sludge. Two kinds of anammox bacteria and two kinds of AOB were detected in the SNAP sludge. Existence ratios of anammox and AOB were estimated to be 15% and 8.7%, respectively, based on the obtained clone numbers. This coexisting condition was confirmed by the FISH image of SNAP sludge and its confocal laser scanning microscope.

scholarly journals Effects of Operational Conditions on Treatment Performances of Single-Stage Nitrogen Removal using Anammox and Partial Nitritation (SNAP) Process

2013 ◽  
Vol 49 (4) ◽  
pp. 133-142 ◽  
Author(s):  
MASASHI TAKEKAWA ◽  
SATOSHI OHTA ◽  
DAISUKE YOSHIDA ◽  
TAKAHIRO SATO ◽  
KOUSUKE KANESHIRO ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Single Stage ◽  
Partial Nitritation ◽  
Operational Conditions

scholarly journals Characterization of Sludge from Single-Stage Nitrogen Removal Using Anammox and Partial Nitritation (SNAP)

2006 ◽  
Vol 42 (2) ◽  
pp. 53-64 ◽  
Author(s):  
PHAM KHAC LIEU ◽  
HAYATO HOMAN ◽  
ATSUHIRO KUROGI ◽  
YASUNORI KAWAGOSHI ◽  
TAKAO FUJII ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Single Stage ◽  
Partial Nitritation

scholarly journals Enhanced Nitrogen Removal from Domestic Wastewater by Partial-Denitrification/Anammox in an Anoxic/Oxic Biofilm Reactor

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 109
Author(s):  
Yu Huang ◽  
Yongzhen Peng ◽  
Donghui Huang ◽  
Jiarui Fan ◽  
Rui Du
Keyword(s):  
Nitrogen Removal ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Biofilm Reactor ◽  
Anammox Bacteria ◽  
Stable Operation ◽  
Ammonium Oxidation ◽  
N Accumulation ◽  
Carbon Demand ◽  
Oxidation Efficiency

A partial-denitrification coupling with anaerobic ammonium oxidation (anammox) process (PD/A) in a continuous-flow anoxic/oxic (A/O) biofilm reactor was developed to treat carbon-limited domestic wastewater (ammonia (NH4+-N) of 55 mg/L and chemical oxygen demand (COD) of 148 mg/L in average) for about 200 days operation. Satisfactory NH4+-N oxidation efficiency above 95% was achieved with rapid biofilm formation in the aerobic zone. Notably, nitrite (NO2−-N) accumulation was observed in the anoxic zone, mainly due to the insufficient electron donor for complete nitrate (NO3−-N) reduction. The nitrate-to-nitrite transformation ratio (NTR) achieved was as high as 64.4%. After the inoculation of anammox-enriched sludge to anoxic zones, total nitrogen (TN) removal was significantly improved from 37.3% to 78.0%. Anammox bacteria were effectively retained in anoxic biofilm utilizing NO2−-N produced via the PD approach and NH4+-N in domestic wastewater, with the relative abundance of 5.83% for stable operation. Anammox pathway contributed to TN removal by a high level of 38%. Overall, this study provided a promising method for mainstream nitrogen removal with low energy consumption and organic carbon demand.

Combined partial nitritation/Anammox system for treatment of digester supernatant

2006 ◽  
Vol 53 (12) ◽  
pp. 149-159 ◽  
Author(s):  
L. Gut ◽  
E. Płaza ◽  
J. Trela ◽  
B. Hultman ◽  
J. Bosander
Keyword(s):  
Nitrogen Removal ◽  
Experimental Period ◽  
Vital Role ◽  
Biofilm Reactor ◽  
Operational Parameters ◽  
Partial Nitritation ◽  
Maximum Value ◽  
Air Supply ◽  
One Year ◽  
Aerobic And Anaerobic

One-year (2004) comprehensive investigations in a semi-industrial pilot plant (5 m3) were carried out with the aim of assessing the influence of operational parameters on the partial nitritation/Anammox system performance. In the system designed as a moving-bed biofilm reactor, the influent nitrogen load to the Anammox reactor was progressively increased and a stable Anammox bacterial culture was obtained. Interaction between subsequent aerobic and anaerobic conditions in the partial nitritation and Anammox reactors, respectively, granted conditions to remove nitrogen through the nitrite route. It implies that the oxygen supply can be limited to a high extent. A control strategy for the partial nitritation step relied on concomitant adjustment of the air supply with a variable influent nitrogen load, which can be monitored by both pH and conductivity measurements. In the Anammox reactor, an influent nitrite-to-ammonium ratio plays a vital role in obtaining efficient nitrogen removal. During the 1-year experimental period, the Anammox reactor was operated steadily and average nitrogen removal efficiency was 84% with 97% as the maximum value.

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