scholarly journals A multivariate approach of changes in filamentous, nitrifying and protist communities and nitrogen removal efficiencies during ozone dosage in a full-scale wastewater treatment plant

2019 ◽  
Vol 252 ◽  
pp. 1500-1508 ◽  
Author(s):  
Paula Barbarroja ◽  
Andrés Zornoza ◽  
Daniel Aguado ◽  
Luis Borrás ◽  
José Luis Alonso
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Multivariate Approach ◽  
Removal Efficiencies

Increased nitrogen removal in existing volumes at Sundet wastewater treatment plant, Växjö

2014 ◽  
Vol 9 (2) ◽  
pp. 215-224 ◽  
Author(s):  
Anneli Andersson Chan ◽  
Niklas Johansson ◽  
Magnus Christensson
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Biofilm Reactor ◽  
Main Stream ◽  
Ammonium Oxidation ◽  
N Removal

Many wastewater treatment plants need to improve their nitrogen removal due to stricter requirements and increasing loads. This often means larger bioreactor volumes, which can be very expensive and is sometimes impossible if space is limited. Therefore, there is a need for compact hybrid solutions that can increase capacity within existing volumes. Two full-scale demonstration projects using moving bed biofilm reactor (MBBR) technology has proven to be an efficient way to treat nitrogen in existing volumes at Sundet wastewater treatment plant in Växjö. Increased nitrification and denitrification capacity in parts of the main stream were demonstrated through the Hybas™ process, a combination of MBBR and activated sludge using the integrated fixed-film activated sludge technology. The ANITA™ Mox process, using autotrophic N-removal through anaerobic ammonium oxidation (anammox), provided high nitrogen removal for the sludge liquor. Data collected on-site for over a year are analyzed and compared with the performance of conventional treatment systems. These two full-scale demonstration projects have been a successful learning experience in identifying and correcting both process and operational issues, which may not have arisen at pilot scale. The set objectives in terms of nitrogen removal were met for both processes and design modifications have been identified that will improve future operation at Sundet WWTP.

The first two years of full scale operation of the two-stage Main Wastewater Treatment Plant of Vienna

2009 ◽  
Vol 4 (1) ◽  
Author(s):  
G. Wandl ◽  
H. Schaar ◽  
M. Papp ◽  
K. Svardal
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Evaluation Studies ◽  
Treatment Plant ◽  
Full Scale ◽  
Two Stage ◽  
Effluent Recirculation ◽  
Nitrogen Elimination ◽  
Year 2000

The Main Wastewater Treatment Plant of Vienna had to be extended to guarantee sufficient nitrogen removal. After intensive evaluation studies a two-stage activated sludge system was chosen for the plant-extension. Due to the very small specific reactor tank volume of two-stage treatment plants in comparison with low loaded single-stage plants internal cycles had to be applied to ensure sufficient nitrogen removal. Starting in the year 2000 the plant extension was finished by the beginning of 2005 and the extended plant went into operation in spring. The Austrian effluent standards had to be fulfilled by December 2005. This paper presents a description of the plant layout and gives an overview of the operating results of the first two years of full scale operation. Mass balances were used to evaluate the pathways of nitrogen removal. The results confirmed the expected flexibility of the chosen concept; nitrogen elimination did not decrease although the effluent recirculation that has been implemented to ensure sufficient nitrogen removal efficiency especially during winter had been reduced markedly due to energy reasons. The treatment efficiency that was observed at pilot plant investigations was clearly exceeded.

Influence of primary sedimentation on pre-denitrification system performances

2001 ◽  
Vol 44 (1) ◽  
pp. 113-120 ◽  
Author(s):  
G. Esposito ◽  
C. Bastianutti ◽  
G. Bortone ◽  
F. Pirozzi ◽  
S. Sgroi
Keyword(s):  
Sensitivity Analysis ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Total N ◽  
Removal Efficiencies

The effects of suppressing primary sedimentation on nitrogen removal efficiency of a pre-denitrification system have been evaluated for a large municipal wastewater treatment plant. Simulations have been carried out using the STOAT model. For both the process schemes with and without primary sedimentation, nitrification efficiencies are calculated for increasing influent loads of COD, total N and suspended solids. The sensitivity analysis shows that for the usual carbon to nitrogen ratios in the raw influent both the process schemes allow the requested removal efficiencies, whereas for significantly high C/N ratios the scheme with primary sedimentation is preferable.

scholarly journals Model-Based Solution for Upgrading Nitrogen Removal for a Full-Scale Municipal Wastewater Treatment Plant with CASS Process

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 527
Author(s):  
Mengmeng Liu ◽  
Meixue Chen ◽  
Rong Qi ◽  
Dawei Yu ◽  
Min Yang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Cfd Simulation ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Full Scale ◽  
Municipal Wastewater Treatment

Aiming at providing cost-effective approach for upgrading the existing municipal wastewater treatment plants in the cold region of China to meet more stringent discharge standards of nitrogen removal, a full-scale sewage treatment plant with the CASS process was selected through focusing on biological process, key equipment and hydrodynamics in bioreactors by the activated sludge model 1 (ASM1) and computational fluid dynamics (CFD) model. Influent COD fractions and the key characteristic parameters (YH and bH) of the activated sludge were determined through the respirometry at temperatures of 10 °C and 20 °C, respectively. The layout of submerged agitator installation in the bioreactor of the CASS process was optimized through CFD simulation. The calculation of the average relative deviation (less than 20%) between simulated data and the operation data, demonstrated that the ASM1 model could be reasonably used in the wastewater treatment plant simulation. The upgrade solution based on modelling of ASM1 and CFD was successfully applied in practice, which not only made the effluent COD, NH4+-N and TN concentrations meet with the discharge standard of Grade I-A, but also reduced the energy consumption by 25% and 16.67% in summer and winter, respectively. After upgrading, microbial diversity increased in both summer and winter, with an especially significant increase of the relative abundance of denitrifying bacteria.

Operational Results of the Wolfsburg Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 203-209 ◽  
Author(s):  
R. Kayser ◽  
G. Stobbe ◽  
M. Werner
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Total Nitrogen Content ◽  
Activated Sludge Process

At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.

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