The invisible BNR plant provides high quality effluent and recreational area for densely populated urban area

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
E. Choi ◽  
Z. Yun ◽  
K.S. Min
Keyword(s):  
Nutrient Removal ◽  
Operating Temperature ◽  
Treatment Plant ◽  
Ground Level ◽  
Biological Nutrient Removal ◽  
High Quality ◽  
Sand Filter ◽  
Sport Facilities ◽  
Final Effluent ◽  
Removal System

In a densely populated area, a large wastewater treatment plant (WWTP) has been constructed in the underground. The plant is practically “invisible” to visitors and neighbours, and the ground level is used as a park and sport facilities in order to avoid the “not in my backyard” phenomenon. The WWTP has a 5-stage biological nutrient removal system utilizing the denitrifying PAO (dPAO) with a step feed in order to treat the weak sewage with higher nutrient removal requirement. Although the underground installation could be expected to increase plant operating temperature, the temperature increase was only 1°C. The polished final effluent from a sand filter produced average TN and TP concentrations of 5.11 mg/L and 0.91 mg/L, respectively with SS concentrations of 0.61 mg/L, indicating that the dPAO system combined with sand filter effectively produced a high quality effluent.

scholarly journals Biological Nutrient Removal Model No. 2 (BNRM2): a general model for wastewater treatment plants

2013 ◽  
Vol 67 (7) ◽  
pp. 1481-1489 ◽  
Author(s):  
R. Barat ◽  
J. Serralta ◽  
M. V. Ruano ◽  
E. Jiménez ◽  
J. Ribes ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Operating Conditions ◽  
Plant Performance ◽  
Biological Nutrient Removal ◽  
Nitrite Oxidizing Bacteria ◽  
Removal Model

This paper presents the plant-wide model Biological Nutrient Removal Model No. 2 (BNRM2). Since nitrite was not considered in the BNRM1, and this previous model also failed to accurately simulate the anaerobic digestion because precipitation processes were not considered, an extension of BNRM1 has been developed. This extension comprises all the components and processes required to simulate nitrogen removal via nitrite and the formation of the solids most likely to precipitate in anaerobic digesters. The solids considered in BNRM2 are: struvite, amorphous calcium phosphate, hidroxyapatite, newberite, vivianite, strengite, variscite, and calcium carbonate. With regard to nitrogen removal via nitrite, apart from nitrite oxidizing bacteria two groups of ammonium oxidizing organisms (AOO) have been considered since different sets of kinetic parameters have been reported for the AOO present in activated sludge systems and SHARON (Single reactor system for High activity Ammonium Removal Over Nitrite) reactors. Due to the new processes considered, BNRM2 allows an accurate prediction of wastewater treatment plant performance in wider environmental and operating conditions.

Alternatives for upgrading the Wilderness Wastewater Treatment Plant for biological nutrient removal

2004 ◽  
Vol 48 (11-12) ◽  
pp. 453-462
Author(s):  
E.U. Cokgor ◽  
C.W. Randall
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Biological Nutrient Removal ◽  
Oxidation Ditch ◽  
Concentric Ring ◽  
Annual Average ◽  
Flow Capacity ◽  
Ring Oxidation

The Wilderness Wastewater Treatment Plant (WWTP) located in Orange County, Virginia is a four concentric ring oxidation ditch activated sludge system with a rated capacity of 1,935 m3/day. The three outer rings are used for wastewater treatment and the inner ring is used as an aerobic digester. The flow capacity has been increased from 1,935 to 3,760 m3/d, however, the desired design capacity has since been increased to 3,870 m3/d, and there are plans to eventually expand to approximately 4,840 m3/d with improved nitrogen removal. The design goal for the planned upgrade is to discharge an effluent that contains less than 10 mg/l total nitrogen (TN) at all times, with an annual average of 8 mg/l or less. In this study, the pre-upgrade performance of the Wilderness Wastewater Treatment Plant was evaluated and several modifications were recommended for the incorporation of biological nutrient removal (BNR).

Metagenomic and metabolomic analysis reveals the effects of chemical phosphorus recovery on biological nutrient removal system

2017 ◽  
Vol 328 ◽  
pp. 1087-1097 ◽  
Author(s):  
Hongliang Dai ◽  
Zheqin Dai ◽  
Lihong Peng ◽  
Yifeng Wu ◽  
Haiming Zou ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Phosphorus Recovery ◽  
Biological Nutrient Removal ◽  
Metabolomic Analysis ◽  
Removal System

Biological Nutrient Removal at the Blue Plains Wastewater Treatment Plant in Washington, D.C.

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2233-2236 ◽  
Author(s):  
S. J. Kang ◽  
W. F. Bailey ◽  
D. Jenkins
Keyword(s):  
Nutrient Removal ◽  
Nitrogen Concentration ◽  
Treatment Plant ◽  
Phosphorus Limitation ◽  
Biological Nutrient Removal ◽  
Significant Finding ◽  
Biological Phosphorus Removal ◽  
Detention Time ◽  
Nitrogen Ratio ◽  
Biological Nitrogen

A pilot study was conducted to establish feasibility of biological nutrient removal at one of the most advanced wastewater treatments in the U.S. The results of the study revealed technical feasibility of biological phosphorus removal at extremely high F/M (0.84 1/day) and a short hydraulic detention time (2.2 hours) in the first stage activated sludge system. Due to phosphorus limitation of 0.18 mg/l, it was determined that none of the single sludge BNR processes was applicable at this facility. In the second stage, therefore, biological nitrogen removal was achieved with both methanol and primary effluent as a carbon source. Another significant finding was that after acclimation, the primary effluent exhibited the same rate of denitrification as with methanol (2.7 mg NO3− N/gVSS·hr). Further pilot testing revealed correlations among such process variables as detention time, BOD to nitrogen ratio, and effluent nitrogen concentration.

Biological nutrient removal applied to weak sewage

1994 ◽  
Vol 29 (12) ◽  
pp. 41-48 ◽  
Author(s):  
J. Charlton
Keyword(s):  
Nutrient Removal ◽  
Treatment Process ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Primary Sludge ◽  
University Of British Columbia ◽  
Biological Nitrogen ◽  
Influent Wastewater

The Melby Wastewater Treatment Plant is located in the municipality of Frederiksværk on the island of Sealand, Denmark. This may be the first full-scale plant in Europe purpose built for biological nutrient removal from diluted wastewater, i.e. weak domestic wastewater mixed with infiltration waters. The relatively strict effluent standards have required the existing treatment plant to be upgraded in capacity, including the design for biological Nitrogen and Phosphorus removal. Due to the weak nature of the influent wastewater, the treatment process that has been adopted includes the application of a primary sludge fermenter to alter the influent characteristics suitable for biological nutrient removal. The treatment process used is the Modified University of Cape Town process utilising a primary sludge fermenter developed at the University of British Columbia in Canada. The combination of these two processes has been successfully applied to meet the strict discharge licence requirements, without the addition of chemicals, despite the unsuitable characteristics of the influent wastewater for biological nutrient removal. The paper describes the operational results for the treatment plant.

Operation with biological nutrient removal with stable nitrification and control of filamentous growth

1998 ◽  
Vol 37 (4-5) ◽  
pp. 549-554 ◽  
Author(s):  
Maria Rothman
Keyword(s):  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Filamentous Growth ◽  
Biological Nutrient Removal ◽  
Nitrification Rate ◽  
Do Concentration ◽  
And Control ◽  
Process Strategy

Bromma WWTP is the second largest wastewater treatment plant in Stockholm, Sweden. To meet new regulations regarding nitrogen removal the plant needs to be operated with nitrogen removal all year round. In previous years, severe bulking problems during the winter have made it impossible to maintain nitrification during colder temperatures. Microscopic examination of the activated sludge has increased the understanding of bulking. The bulking is mainly due to excessive growth of filamentous organisms, mainly Microthrix parvicella. By operating the plant with a high F/M ratio and decreasing the F/M ratio when filamentous growth occurs, excessive growth of these organisms can be avoided. The nitrification rate is optimized by adjusting the concentration of mixed liquid suspended solids in the tanks so that the nitrification is complete and by operating the tanks at a DO concentration of 4 mg/l. By this process strategy it is now possible to operate the plant with nitrification all year round.

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