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

1997 ◽  
Vol 35 (1) ◽  
pp. 113-120 ◽  
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.

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

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

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

2011 ◽  
Vol 64 (5) ◽  
pp. 1142-1147 ◽  
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.

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

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Huoqing Wang ◽  
Yuntao Guan ◽  
Li Li ◽  
Guangxue Wu
Keyword(s):  
Organic Carbon ◽  
Nitrogen Removal ◽  
Operating Mode ◽  
Biological Nutrient Removal ◽  
Biological Nitrogen Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Term Operation ◽  
Nitrite Oxidizing Bacteria ◽  
Biological Nitrogen

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.

Effect of dissolved oxygen conditions on nitrogen removal in continuously fed intermittent-aeration process with two tanks

2002 ◽  
Vol 45 (12) ◽  
pp. 181-188 ◽  
Author(s):  
T. Hidaka ◽  
H. Yamada ◽  
M. Kawamura ◽  
H. Tsuno
Keyword(s):  
Nitrogen Removal ◽  
Rural Areas ◽  
Aerobic Condition ◽  
Small Scale ◽  
Intermittent Aeration ◽  
Solids Retention ◽  
Oxygen Conditions ◽  
Control Set ◽  
Aeration Process ◽  
Biological Nitrogen

In this study, an intermittent aeration type activated sludge process that is fed continuously is evaluated for nitrogen and organic carbon for facilities in rural areas, which are characterized by small scale, low loading rate and automatic operation. Anoxic and aerobic conditions can be regulated alternatively by intermittent aeration for biological nitrogen removal. It is proved that an intermittent aeration cycle of 90 min, with aeration/anoxic mixing periods of 25~30 min/65~60 min in Tank 1, and 30~45 min/60~45 min in Tank 2, and a DO control set at 0.6~1 mg/L during the aeration period are required for satisfactory treatment performance. Under these conditions, a stable effluent water quality with BOD ≤ 5 mg/L, CODMn ≤ 8 mg/L, Nitrogen ≤ 3 mgN/L, SS ≤ 5 mg/L and transparency ≥ 80 cm can be achieved. The solids retention time in aerobic condition was 10~25 d, which is sufficient for nitrification.

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