Characteristics of Biological Nitrogen Removal in a Multiple Anoxic and Aerobic Biological Nutrient Removal Process

Two sequencing batch reactors, one with the conventional anoxic and aerobic (AO) process and the other with the multiple AO process, were operated to examine characteristics of biological nitrogen removal, especially of the multiple AO process. The long-term operation showed that the total nitrogen removal percentage of the multiple AO reactor was 38.7% higher than that of the AO reactor. In the multiple AO reactor, at the initial SBR cycle stage, due to the occurrence of simultaneous nitrification and denitrification, no nitrite and/or nitrate were accumulated. In the multiple AO reactor, activities of nitrite oxidizing bacteria were inhibited due to the multiple AO operating mode applied, resulting in the partial nitrification. Denitrifiers in the multiple AO reactor mainly utilized internal organic carbon for denitrification, and their activities were lower than those of denitrifiers in the AO reactor utilizing external organic carbon.

Download Full-text

Design of Sequencing Batch Reactors for Biological Nitrogen Removal from High Strength Wastewaters

Journal of Environmental Science and Health Part A ◽

10.1081/ese-120023340 ◽

2003 ◽

Vol 38 (10) ◽

pp. 2125-2134 ◽

Cited By ~ 8

Author(s):

Nazik Artan ◽

Nevin Ozgur Yagci ◽

S. Reha Artan ◽

Derin Orhon

Keyword(s):

Nitrogen Removal ◽

High Strength ◽

Biological Nitrogen Removal ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Biological Nitrogen

Download Full-text

Biological Nitrogen Removal of High Salinity Produced Water in Sequencing Batch Reactors

Proceedings of the Water Environment Federation ◽

10.2175/193864708788735655 ◽

2008 ◽

Vol 2008 (17) ◽

pp. 128-141

Author(s):

V. Santiago ◽

R. Souza ◽

B. Versiani ◽

A. Cerqueira ◽

F. Rodrigues ◽

...

Keyword(s):

Nitrogen Removal ◽

Produced Water ◽

High Salinity ◽

Biological Nitrogen Removal ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Biological Nitrogen

Download Full-text

A two-sludge system for simultaneous biological C, N and P removal via the nitrite pathway

Water Science & Technology ◽

10.2166/wst.2011.398 ◽

2011 ◽

Vol 64 (5) ◽

pp. 1142-1147 ◽

Cited By ~ 11

Author(s):

M. Marcelino ◽

D. Wallaert ◽

A. Guisasola ◽

J. A. Baeza

Keyword(s):

Nitrogen Removal ◽

Ph Control ◽

Biological Nitrogen Removal ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Major Drawback ◽

Process Implementation ◽

N Removal ◽

Biological Nitrogen ◽

P Removal

Nitrogen removal via the nitrite pathway results in significant savings in both aeration costs and COD requirements for denitrification when compared to the conventional biological nitrogen removal process. Implementation of the nitrite pathway for simultaneous C/N/P removal in a single sludge system has a major drawback: the aeration phase disfavours denitrifying phosphorus removal. A possible configuration to overcome this issue is the utilisation of a two-sludge system where autotrophic and heterotrophic populations are physically separated. This paper experimentally demonstrates the feasibility of a nitrite-based two-sludge system with sequencing batch reactors (SBR) for the treatment of urban wastewater: a heterotrophic SBR with denitrifying PAOs for P removal and an aerobic SBR for N removal. Partial nitrification was attained in the autotrophic SBR so that shortcut biological nitrogen removal was achieved by using the anoxic dephosphatation activity of DPAOs. Finally, the effect of operating this system without pH control was studied using different influent pH values (pH = 6.8, 7.5 and 8.2) and, despite some efficiency lost due to the pH fluctuations, the system was able to remove most of the C, N and P present in the wastewater.

Download Full-text

Organic carbon bioavailability: is it a good driver to choose the best biological nitrogen removal process?

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.147390 ◽

2021 ◽

pp. 147390

Author(s):

Gabriela Bonassa ◽

Alice Chiapetti Bolsan ◽

Camila Ester Hollas ◽

Bruno Venturin ◽

Daniela Candido ◽

...

Keyword(s):

Organic Carbon ◽

Nitrogen Removal ◽

Biological Nitrogen Removal ◽

Removal Process ◽

Biological Nitrogen

Download Full-text

Experimental validation of a simulation and design model for nitrogen removal in sequencing batch reactors

Water Science & Technology ◽

10.2166/wst.1997.0026 ◽

1997 ◽

Vol 35 (1) ◽

pp. 113-120 ◽

Cited By ~ 14

Author(s):

G. Andreottola ◽

G. Bortone ◽

A. Tilche

Keyword(s):

Nitrogen Removal ◽

Phase Distribution ◽

Nitrogen Concentration ◽

Design Procedure ◽

Aerobic Condition ◽

Batch Reactors ◽

Sequencing Batch Reactors ◽

Daily Cycle ◽

Piggery Wastewater ◽

Biological Nitrogen

The development and the sensitivity analysis of a dynamic SBR simulation model for biological nitrogen removal, based on the Activated Sludge Model N. 1, are presented. An experimental study for the calibration and validation of the model was carried out using a bench scale SBR. Piggery wastewater was used as feed. The operating daily cycle of the SBR reactor included three sub-cycles of 7.5 hours each, each one alternating anoxic and aerobic condition, while settling phase was carried out at the end of the three sub-cycles. A first enhancement of model N. 1 was performed splitting nitrification into the two sub-processes of nitriation and nitratation. A second enhancement of the model was obtained with the introduction of a switch function of nitratation kinetics. An algorithm for optimization of the cycle length and phase distribution in order to minimize effluent nitrogen concentration was developed. A design procedure of SBR systems is also described.

Download Full-text

Study on Biological Nitrogen Removal Performance of Aerobic Denitrification Treating Power Plant Wastewater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.726-731.2589 ◽

2013 ◽

Vol 726-731 ◽

pp. 2589-2593

Author(s):

Tao Yang ◽

Pei Ying Wu ◽

Zhan Sheng Zhao ◽

Hua Wei Xu ◽

Gao Zhi Lv

Keyword(s):

Power Plant ◽

Carbon Source ◽

Organic Carbon ◽

Activated Sludge ◽

Nitrogen Removal ◽

Sodium Acetate ◽

Aerobic Denitrification ◽

Biological Nitrogen Removal ◽

Organic Carbon Source ◽

Biological Nitrogen

Enriched domestication in SBR was used to improve the proportion of aerobic denitrifiers in activated sludge, and actual power plant wastewater was treated, which proved the existence of aerobic denitrification. But at the later stage, because of carbon deficiency, aerobic denitrifiers were inhibited and NO3--N accumulated. Sodium acetate used as external organic carbon source was added when reaction carried on 3.5 hours to improve the COD/NH4+-N ratio from 6.5 to 10, effluent NO3--N concentration was 3.6 mg\L, average removal efficiency of TN was 90%, which could improve the aerobic denitrification performance of whole system effectively.

Download Full-text

Light as a Novel Inhibitor of Nitrite-Oxidizing Bacteria (NOB) for the Mainstream Partial Nitrification of Wastewater Treatment

Processes ◽

10.3390/pr9020346 ◽

2021 ◽

Vol 9 (2) ◽

pp. 346

Author(s):

Keugtae Kim ◽

Yong-Gyun Park

Keyword(s):

Wastewater Treatment ◽

Blue Light ◽

Nitrogen Removal ◽

Municipal Wastewater ◽

Partial Nitrification ◽

Biological Nutrient Removal ◽

Nitrite Accumulation ◽

Light Illumination ◽

Ammonia Oxidizing Bacteria ◽

Nitrite Oxidizing Bacteria

Conventional biological nutrient removal processes in municipal wastewater treatment plants are energy-consuming, with oxygen supply accounting for 45–75% of the energy expenditure. Many recent studies examined the implications of the anammox process in sidestream wastewater treatment to reduce energy consumption, however, the process did not successfully remove nitrogen in mainstream wastewater treatment with relatively low ammonia concentrations. In this study, blue light was applied as an inhibitor of nitrite-oxidizing bacteria (NOB) in a photo sequencing batch reactor (PSBR) containing raw wastewater. This simulated a biological nitrogen removal system for the investigation of its application potential in nitrite accumulation and nitrogen removal. It was found that blue light illumination effectively inhibited NOB rather than ammonia-oxidizing bacteria due to their different sensitivity to light, resulting in partial nitrification. It was also observed that the NOB inhibition rates were affected by other operational parameters like mixed liquor suspended solids (MLSS) concentration and sludge retention time (SRT). According to the obtained results, it was concluded that the process efficiency of partial nitrification and anammox (PN/A) could be significantly enhanced by blue light illumination with appropriate MLSS concentration and SRT conditions.

Download Full-text