Extensive nitrogen removal in a new type of airlift reactor

2000 ◽  
Vol 41 (4-5) ◽  
pp. 469-476 ◽  
Author(s):  
C.T.M.J. Frijters ◽  
S. Vellinga ◽  
T. Jorna ◽  
R. Mulder
Keyword(s):  
Waste Water ◽  
Nitrogen Removal ◽  
New Technology ◽  
Pilot Scale ◽  
Airlift Reactor ◽  
Processing Waste ◽  
Potato Processing ◽  
New Type ◽  
Total Nitrogen Removal ◽  
Biological Performance

A new type of CIRCOX® airlift reactor was started-up treating anaerobically pre-treated potato-processing waste water. This type of airlift reactor with biofilms on carrier is an airlift reactor extended with an anoxic compartment to obtain total nitrogen removal. This type of reactor was designed in the early nineties and was tested successfully at pilot-scale on brewery and municipal waste water. The 3 m3 pilot reactor was scaled-up to a size of 130 m3. Both the hydraulics and the biological performance were studied. High liquid velocities and equal concentrations of sludge throughout the whole reactor, indicated that the system was well mixed. Up to 5 kg COD/m3/day was removed. Ammonia was almost completely removed (up to 1.0 kg NH4–N/ m3/day in the aerated compartment). The denitrification efficiency was over 90%. The NOX–N concentration in the effluent never exceeded 6 mg/l. The biofilm layers were extremely dense: 30 g/l of VSS with a sludge volume of 220 ml/l. Therefore the particles had high settling velocities and could easily be retained in the reactor. It can be concluded that this new technology has been scaled-up successfully. With this an aerobic technology is available in which extended treatment and nitrogen removal are accomplished in a very compact system.

Nitrification and denitrification in partially aerated biological aerated filter (BAF) with dual size sand media

2007 ◽  
Vol 55 (1-2) ◽  
pp. 9-17 ◽  
Author(s):  
J.H. Ha ◽  
S.K. Ong
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Pilot Scale ◽  
Biological Aerated Filter ◽  
Loading Rates ◽  
Oxic Zone ◽  
Nitrogen Concentrations ◽  
Total Nitrogen Removal ◽  
Aerated Filter ◽  
Anoxic Zones

A 104-mm (4-inch) diameter pilot-scale biological aerated filter (BAF) with a media depth of 2.5 m (8.3 feet) was operated with an anaerobic, anoxic and oxic zone at a temperature of 23°C. The medium for the anaerobic and anoxic zones was 10 mm diameter sand while the medium for the oxic zone was 5 mm diameter sand. The influent sCOD and total nitrogen concentrations in the feedwater were approximately 250 mg/L and 35 mg N/L, respectively. sCOD removal at optimum hydraulic retention time (HRT) of 3 h with recirculation rates of 100, 200 and 300% in the column was above 96%. Nitrification was found to be more than 96% for 3 h HRT at 200 and 300% recirculation. Total nitrogen removal was consistent at more than 80% for 4 and 6 h HRT at 300% recirculation. For 3 h HRT and 300% recirculation, total nitrogen removal was approximately 79%. The ammonia loading rates for maximum ammonia removed were 0.15 and 0.19 kg NH3-N/m3-day for 100 and 200% recirculation, respectively. The experimental results demonstrated that the BAF can be operated at an HRT of 3 h with 200–300% recirculation rates with more than 96% removal of sCOD and ammonia and at least 75% removal of total nitrogen.

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.

Organic matter and total nitrogen removal from wastewater using a pilot-scale membrane-aerated biofilm reactor

2021 ◽  
pp. 100817
Author(s):  
Withanage Buddhima Sharmane Siriweera ◽  
Lee Yun-Je ◽  
Kobayashi Masumi ◽  
Chettiyappan Visvanathan
Keyword(s):  
Organic Matter ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Pilot Scale ◽  
Biofilm Reactor ◽  
Total Nitrogen Removal

Full-scale applications for both COD and nutrient removal in a CIRCOX® airlift reactor

2007 ◽  
Vol 55 (8-9) ◽  
pp. 107-114 ◽  
Author(s):  
C.T.M.J. Frijters ◽  
M. Silvius ◽  
J. Fischer ◽  
R. Haarhuis ◽  
R. Mulder
Keyword(s):  
Nitrogen Removal ◽  
Ammonia Removal ◽  
Full Scale ◽  
Airlift Reactor ◽  
Treated Wastewater ◽  
Reactor Technology ◽  
First Case ◽  
Biological Performance ◽  
Biofilm Development ◽  
Anammox Process

The airlift reactor technology has been successfully applied at full scale for both COD and nitrogen removal. In this study, the results of the biofilm development and biological performance of two full scale reactors are discussed. At Paulaner Brewery in Munich, the airlift reactor was applied for COD and ammonia removal of anaerobically treated wastewater. In the other case the airlift reactor was applied as a pretreatment of nitrogen removal by the Anammox process. Water from a Tannery company in Lichtenvoorde in the Netherlands, The Hulshof Royal Dutch Tanneries, was pretreated anaerobically for COD removal and aerobically to remove the sulphides as sulphur. In an airlift reactor the ammonia was partially oxidised to nitrite. In both cases the granular biomass developed well; the concentrations amounted to 250 ml/L and 500 ml/L respectively. In the first case, 4 kg/m3/day of COD was removed, the soluble concentration of COD was less than 250 mg/L. The nitrification to nitrate was nearly complete and amounted to 0.5 kg NH4-N/m3/day. In the second application, 50% of the ammonia (on average 0.45 kg N/m3/d) was nitrified to nitrite. This process was easily controlled by regulating the amount of air according to the nitrite and ammonia concentrations in the effluent. It can be concluded that in both cases the particular processes were very stable and easy to operate.

Pilot-Scale Testing of the Hybrid Membrane Biofilm Process (HMBP) for Total Nitrogen Removal from Municipal Wastewater

2008 ◽  
Vol 2008 (9) ◽  
pp. 6236-6244 ◽  
Author(s):  
Leon S. Downing ◽  
Kyle Bibby ◽  
Kathleen Esposito ◽  
Thomas Fascianella ◽  
Robert Nerenberg
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Hybrid Membrane ◽  
Total Nitrogen Removal ◽  
Biofilm Process

scholarly journals Upgrading northern municipal lagoons: Total nitrogen removal and phosphorus assimilation at ultra-low temperatures

2021 ◽  
Author(s):  
Patrick M. D'Aoust ◽  
Simon Vincent ◽  
Guillaume Leblond ◽  
Raheleh Arabgol ◽  
Richard Hérard ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Low Temperatures ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Biofilm Reactor ◽  
Sulfide Toxicity ◽  
Total Ammonia ◽  
Treatment Train ◽  
Total Nitrogen Removal

In this study, a municipal lagoon with high wintertime effluent total ammonia nitrogen (TAN) concentrations was upgraded with a pilot-scale NIT-NIT-DENIT moving bed biofilm reactor (MBBR) treatment train to characterize its effluent over wintertime operation, investigate the feasibility of upgrading lagoons to achieve substantial biological total nitrogen removal across ultra-low temperatures (0.6 – 3.0°C) and investigate nitrification inhibition pathways in facultative lagoon systems at ultra-low temperatures. Throughout the study, it was observed that the system substantially reduced total nitrogen (TN) and total phosphorus (TP) effluent concentrations by an average of 69.0 ± 24.5% and 74.7 ± 20.1%, respectively, with average TN and TP concentrations exiting the treatment train of 7.60 ± 5.60 mg-N/L and 0.05 ± 0.02 mg-P/L, respectively, indicating the feasibility of upgrading municipal lagoons to meet increasing stringent effluent standards to ensure the perenniality of water resources. Furthermore, it was observed that sulfide toxicity may play an important role in the inhibition of nitrifying organisms in lagoons.

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