scholarly journals Addition of anaerobic ammonium oxidation bacteria to lower running cost during the membrane bioreactor process treating sewage

2021 ◽  
Author(s):  
Ronglin Sun ◽  
Wenjie Zhang
Keyword(s):  
Membrane Bioreactor ◽  
High Throughput Sequencing ◽  
Aeration Rate ◽  
Anaerobic Ammonium Oxidation ◽  
Ammonium Oxidation ◽  
N Removal ◽  
Running Cost ◽  
Heterotrophic Denitrification ◽  
Reducing Energy ◽  
Bioreactor Process

Abstract Reducing energy consumption or running cost associated with the membrane bioreactor (MBR) process is a serious challenge that needs to be addressed in treating sewage. The addition of anaerobic ammonium oxidation bacteria (AnAOB) to a running MBR has the potential to lower the aeration rate, thus decreasing the running cost in treating sewage. The results obtained showed that owing to addition of AnAOB, TN and NH4+-N removal rates increased by 9.8% and 1.13%, respectively, while the aeration rate decreased by 50%. Additionally, high throughput sequencing and isotope experiments showed that both AnAOB and heterotrophic denitrification bacteria could survive simultaneously and play an important role in nitrogen removal, with AnAOB having a significantly greater contribution. It can be concluded that the addition of AnAOB reduced the running cost of MBR in treating sewage.

scholarly journals Autotrophic ammonia removal from landfill leachate using anaerobic membrane bioreactor

2017 ◽  
Author(s):  
S. Suneethi ◽  
Kurian Joseph
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Ammonia Removal ◽  
Nitrogen Loading ◽  
Ammonium Oxidation ◽  
Anaerobic Membrane Bioreactor ◽  
N Removal ◽  
Anammox Process

Anaerobic Membrane Bioreactor (AnMBR) is an innovative high cell density system having complete biomass retention, high reactor loading and low sludge production and suitable for developing slow growing autotrophic bacterial cultures such as ANAMMOX. The Anaerobic Ammonium Oxidation (ANAMMOX) process is an advanced biological nitrogen removal removes ammonia using nitrite as the electron acceptor without oxygen. The NH4+-N in the landfill leachate that is formed due to the release of nitrogen from municipal solid waste (MSW), when discharged untreated, into the surface water can result in eutrophication, aquatic toxicity and emissions of nitrous oxide (N2O) to atmosphere. Besides, NH4+-N accumulation in landfills poses long term pollution issue with significant interference during post closure thereby requiring its removal prior to ultimate disposal into inland surface waters. The main objective of this study was to investigate the feasibility and treatment efficiency of treating landfill leachate (to check) for removing NH4+-N by adopting ANAMMOX process in AnMBR. The AnMBR was optimized for Nitrogen Loading Rate (NLR) varying from 0.025 to 5 kg NH4+-N/ m3/ d with hydraulic retention time (HRT) ranging from 1 to 3 d. NH4+-N removal efficacy of 85.13 ± 9.67% with the mean nitrogen removal rate (NRR) of 5.54 ± 0.63 kg NH4+-N/ m3/ d was achieved with nitrogen loading rate (NLR) of 6.51 ± 0.20 kg NH4+- N/ m3/ d at 1.5 d HRT. The nitrogen transformation intermediates in the form of hydrazine (N2H4) and hydroxylamine (NH2OH) were 0.008 ± 0.005 mg/L and 0.006 ± 0.001 mg/L, respectively, indicating co-existence of aerobic ammonia oxidizers (AOB) and ANAMMOX. The free ammonia (NH3) and free nitrous acid (HNO2) concentrations were 26.61 ± 16.54 mg/L and (1.66 ± 0.95) x 10-5 mg/L, preventing NO2--N oxidation to NO3--N enabling sustained NH4+- N removal.

Nitrogen removal from sludge digester liquids by nitrification/denitrification or partial nitritation/anammox: environmental and economical considerations

2004 ◽  
Vol 50 (10) ◽  
pp. 19-26 ◽  
Author(s):  
C. Fux ◽  
H. Siegrist
Keyword(s):  
Nitrogen Removal ◽  
Wastewater Treatment Plants ◽  
Anaerobic Ammonium Oxidation ◽  
Anaerobic Sludge ◽  
Main Stream ◽  
Ammonium Oxidation ◽  
N2o Production ◽  
Partial Nitritation ◽  
Nitrogen Elimination ◽  
Heterotrophic Denitrification

In wastewater treatment plants with anaerobic sludge digestion, 15–20% of the nitrogen load is recirculated to the main stream with the return liquors from dewatering. Separate treatment of this ammonium-rich digester supernatant significantly reduces the nitrogen load of the activated sludge system. Two biological applications are considered for nitrogen elimination: (i) classical autotrophic nitrification/heterotrophic denitrification and (ii) partial nitritation/autotrophic anaerobic ammonium oxidation (anammox). With both applications 85-90% nitrogen removal can be achieved, but there are considerable differences in terms of sustainability and costs. The final gaseous products for heterotrophic denitrification are generally not measured and are assumed to be nitrogen gas (N2). However, significant nitrous oxide (N2O) production can occur at elevated nitrite concentrations in the reactor. Denitrification via nitrite instead of nitrate has been promoted in recent years in order to reduce the oxygen and the organic carbon requirements. Obviously this “achievement” turns out to be rather disadvantageous from an overall environmental point of view. On the other hand no unfavorable intermediates are emitted during anaerobic ammonium oxidation. A cost estimate for both applications demonstrates that partial nitritation/anammox is also more economical than classical nitrification/denitrification. Therefore autotrophic nitrogen elimination should be used in future to treat ammonium-rich sludge liquors.

scholarly journals Coupled anaerobic ammonium oxidation and hydrogenotrophic denitrification for simultaneous NH4-N and NO3-N removal

2018 ◽  
Vol 79 (5) ◽  
pp. 975-984 ◽  
Author(s):  
Tatsuru Kamei ◽  
Rawintra Eamrat ◽  
Kenta Shinoda ◽  
Yasuhiro Tanaka ◽  
Futaba Kazama
Keyword(s):  
Nitrogen Removal ◽  
Inorganic Nitrogen ◽  
Nitrate Removal ◽  
Fixed Bed ◽  
Anaerobic Ammonium Oxidation ◽  
Anammox Bacteria ◽  
Ammonium Oxidation ◽  
N Removal ◽  
Anammox Process

Abstract Nitrate removal during anaerobic ammonium oxidation (anammox) treatment is a concern for optimization of the anammox process. This study demonstrated the applicability and long-term stability of the coupled anammox and hydrogenotrophic denitrification (CAHD) process as an alternative method for nitrate removal. Laboratory-scale fixed bed anammox reactors (FBR) supplied with H2 to support denitrification were operated under two types of synthetic water. The FBRs showed simultaneous NH4-N and NO3-N removal, indicating that the CAHD process can support NO3-N removal during the anammox process. Intermittent H2 supply (e.g. 5 mL/min for a 1-L reactor, 14/6-min on/off cycle) helped maintain the CAHD process without deteriorating its performance under long-term operation and resulted in a nitrogen removal rate of 0.21 kg-N/m3/d and ammonium, nitrate, and dissolved inorganic nitrogen removal efficiencies of 73.4%, 80.4%, and 77%, respectively. The microbial community structure related to the CAHD process was not influenced by changes in influent water quality, and included the anammox bacteria ‘Candidatus Jettenia’ and a Sulfuritalea hydrogenivorans-like species as the dominant bacteria even after long-term reactor operation, suggesting that these bacteria are key to the CAHD process. These results indicate that the CAHD process is a promising method for enhancing the efficiency of anammox process.

scholarly journals High denitrification and anaerobic ammonium oxidation contributes to net nitrogen loss in a seagrass ecosystem in the central Red Sea

2018 ◽  
Vol 15 (23) ◽  
pp. 7333-7346 ◽  
Author(s):  
Neus Garcias-Bonet ◽  
Marco Fusi ◽  
Muhammad Ali ◽  
Dario R. Shaw ◽  
Pascal E. Saikaly ◽  
...  
Keyword(s):  
Red Sea ◽  
Coastal Lagoon ◽  
N2 Fixation ◽  
Nitrogen Loss ◽  
Anaerobic Ammonium Oxidation ◽  
Ammonium Oxidation ◽  
N Loss ◽  
Seagrass Meadows ◽  
Bare Sediment ◽  
N Removal

Abstract. Nitrogen loads in coastal areas have increased dramatically, with detrimental consequences for coastal ecosystems. Shallow sediments and seagrass meadows are hotspots for denitrification, favoring N loss. However, atmospheric dinitrogen (N2) fixation has been reported to support seagrass growth. Therefore, the role of coastal marine systems dominated by seagrasses in the net N2 flux remains unclear. Here, we measured denitrification, anaerobic ammonium oxidation (anammox), and N2 fixation in a tropical seagrass (Enhalus acoroides) meadow and the adjacent bare sediment in a coastal lagoon in the central Red Sea. We detected high annual mean rates of denitrification (34.9±10.3 and 31.6±8.9 mg N m−2 d−1) and anammox (12.4±3.4 and 19.8±4.4 mg N m−2 d−1) in vegetated and bare sediments. The annual mean N loss was higher (between 8 and 63-fold) than the N2 fixed (annual mean = 5.9±0.2 and 0.8±0.3 mg N m−2 d−1) in the meadow and bare sediment, leading to a net flux of N2 from sediments to the atmosphere. Despite the importance of this coastal lagoon in removing N from the system, N2 fixation can contribute substantially to seagrass growth since N2 fixation rates found here could contribute up to 36 % of plant N requirements. In vegetated sediments, anammox rates decreased with increasing organic matter (OM) content, while N2 fixation increased with OM content. Denitrification and anammox increased linearly with temperature, while N2 fixation showed a maximum at intermediate temperatures. Therefore, the forecasted warming could further increase the N2 flux from sediments to the atmosphere, potentially impacting seagrass productivity and their capacity to mitigate climate change but also enhancing their potential N removal.

scholarly journals Cultivation of Planktonic Anaerobic Ammonium Oxidation (Anammox) Bacteria Using Membrane Bioreactor

2013 ◽  
Vol 28 (4) ◽  
pp. 436-443 ◽  
Author(s):  
Mamoru Oshiki ◽  
Takanori Awata ◽  
Tomonori Kindaichi ◽  
Hisashi Satoh ◽  
Satoshi Okabe
Keyword(s):  
Membrane Bioreactor ◽  
Anaerobic Ammonium Oxidation ◽  
Anammox Bacteria ◽  
Ammonium Oxidation

Use of Anammox in urban wastewater treatment

2004 ◽  
Vol 4 (1) ◽  
pp. 87-94 ◽  
Author(s):  
M.C.M. van Loosdrecht ◽  
X. Hao ◽  
M.S.M. Jetten ◽  
W. Abma
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Potential Role ◽  
State Of The Art ◽  
The State ◽  
Anaerobic Ammonium Oxidation ◽  
Ammonium Oxidation ◽  
Urban Wastewater ◽  
N Removal ◽  
Urban Wastewater Treatment

Nitrogen removal is the most complicating factor in urban wastewater treatment. Nitrification accounts for more than 50% of the oxygen need and requires long sludge ages. Denitrification is often hampered by a lack of COD. In fact it would be better to use this COD to generate methane. Recent research has shown that it is possible to remove ammonium by anaerobic ammonium oxidation leading to a much reduced need for aeration energy, no need for COD in the N-removal, and a considerable lower sludge production. The state of the art and the potential role in urban wastewater treatment are discussed.

scholarly journals High denitrification and anaerobic ammonium oxidation contributes to net nitrogen loss in a seagrass ecosystem in the central Red Sea

2018 ◽  
Author(s):  
Neus Garcias-Bonet ◽  
Marco Fusi ◽  
Muhammad Ali ◽  
Dario R. Shaw ◽  
Pascal E. Saikaly ◽  
...  
Keyword(s):  
Red Sea ◽  
Coastal Lagoon ◽  
N2 Fixation ◽  
Nitrogen Loss ◽  
Anaerobic Ammonium Oxidation ◽  
Ammonium Oxidation ◽  
N Loss ◽  
Seagrass Meadows ◽  
Bare Sediment ◽  
N Removal

Abstract. Nitrogen loads in coastal areas have increased dramatically with detrimental consequences for coastal ecosystems. Shallow sediments and seagrass meadows are hotspots for denitrification, favoring N loss. However, atmospheric dinitrogen (N2) fixation has been reported to support seagrass growth. Therefore, the role of coastal marine systems dominated by seagrasses in the net N2 flux remains unclear. Here, we measured denitrification, anaerobic ammonium oxidation (anammox), and N2 fixation in tropical seagrass (Enhalus acoroides) meadow and the adjacent bare sediment in a coastal lagoon in the central Red Sea. We detected high annual mean rates of denitrification (34.9 ± 10.3 and 31.6 ± 8.9 mg N m−2 d−1) and anammox (12.4 ± 3.4 and 19.8 ± 4.4 mg N m−2 d−1) in vegetated and bare sediments. The annual mean N loss was higher (8 and 63-fold higher) than the N2 fixed (annual mean = 5.9 ± 0.2 and 0.8  ± 0.3 mg N m−2 d−1) in the meadow and bare sediment, leading to a net flux of N2 from sediments to the atmosphere. Despite the importance of this coastal lagoon in removing N from the system, N2 fixation can contribute substantially to seagrass growth since N2 fixation rates found here could contribute up to 36 % of plant N requirements. In vegetated sediments, anammox rates decreased with increasing organic matter (OM) content, while N2 fixation increased with OM content. Denitrification and anammox increased linearly with temperature, while N2 fixation showed a maximum at intermediate temperatures. Therefore, the forecasted warming could further increase the N2 flux from sediments to the atmosphere, potentially impacting seagrass productivity and their capacity to mitigate climate change but also enhancing their potential N removal.

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