scholarly journals INVESTIGATION INTO BIOLOGICAL NUTRIENT REMOVAL FROM WASTEWATER

2005 ◽  
Vol 13 (4) ◽  
pp. 171-181 ◽  
Author(s):  
Giedre Vaboliene ◽  
Algirdas Bronislovas Matuzevičius
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Oxygen Demand ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biological Nitrogen ◽  
Biological Phosphorus ◽  
Total P ◽  
Regressive Analysis

Nitrogen and phosphorus removal is necessary to avoid eutrophication of water bodies when treated wastewater is outlet to slowly flowing water bodies or recycled as technological water. The “BioBalance” technology as the latest way of nitrogen and phosphorus removal was applied at Utena Wastewater Treatment Plant. Composition of wastewater has an impact on biological phosphorus removal, particularly the ratio of biochemical oxygen demand and total phosphorus (BOD7/Total-P) in wastewater after mechanical treatment. Nitrates in the anaerobic zone can have a negative effect on biological phosphorus removal. Consequently, it is necessary to evaluate the impact of the mentioned factors on biological nitrogen and phosphorus removal. Biological nitrogen and phosphorus removal was evaluated and compared by using the “BioBalance” technology for biological nitrogen and phosphorus removal and technology before reconstruction during this investigation. The correlation regressive analysis of the biochemical oxygen demand and total phosphorus (BOD7/Total‐P) after mechanical treatment and the total phosphorus concentration in the effluent was evaluated. The correlation regressive analysis of nitrates in an anaerobic zone on the aeration tank and the efficiency of phosphorus removal was also evaluated.

Development of MBR with reduced operational and maintenance costs

2006 ◽  
Vol 53 (3) ◽  
pp. 53-60 ◽  
Author(s):  
Y. Annaka ◽  
Y. Hamamoto ◽  
M. Akatsu ◽  
K. Maruyama ◽  
S. Oota ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Power Demand ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Membrane Cleaning ◽  
Sludge Disposal ◽  
Air Supply ◽  
Biological Nitrogen ◽  
Biological Phosphorus

To reduce MBR O&M costs, a new MBR process that conducts efficient simultaneous biological nitrogen and phosphorus removal (BNR) was developed. In the development of this process, various approaches were taken, including reduction of power demand, chemical consumption and sludge disposal costs. To address power demand reductions, air supply requirements for membrane cleaning were reduced. The process adopted an improved membrane that requires less air for cleaning than conventional membranes. It also introduced cyclic aeration, which alternately supplies washing air to the two series of membrane units. Adoption of biological phosphorus removal eliminated chemical costs for phosphorus removal and contributed to the reduction of sludge disposal costs. By combining these technologies, compared to conventional MBR processes, an approximately 27% reduction in O&M costs was achieved.

The Importance of the Acidogenic Microflora in Biological Phosphorus Removal

1985 ◽  
Vol 17 (11-12) ◽  
pp. 199-212 ◽  
Author(s):  
M. Meganck ◽  
D. Malnou ◽  
P. Le Flohic ◽  
G. M. Faup ◽  
J. M. Rovel
Keyword(s):  
Phosphorus Removal ◽  
Phosphorus Release ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Uptake Mechanism ◽  
Nitrogen And Phosphorus Removal ◽  
Low Load ◽  
Biological Nitrogen ◽  
Biological Phosphorus ◽  
Load Conditions

Laboratory and semi-industrial scale pilot plant experiments were carried out to study the possibility of simultaneous biological nitrogen and phosphorus removal under European winter temperature conditions. Whereas nitrogen removal requires very long aerated sludge ages, phosphorus removal seems to be somewhat inhibited by the low sludge loadings. Experiments with fatty acid addition to the influent wastewater have shown the acidogenic phase to be the step that was most affected by these low load conditions. The phosphorus release and uptake mechanism in itself may be slowed down by lower temperatures, but still has some activity. A microbiological study of the organisms in the sludge was undertaken in order to discover which organisms were responsible for the different steps in the phosphorus removal mechanism.

Background to Biological Phosphorus Removal

1983 ◽  
Vol 15 (3-4) ◽  
pp. 1-13 ◽  
Author(s):  
James L Barnard
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Plug Flow ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Anaerobic Conditions ◽  
Paper Briefly ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biological Phosphorus

This paper briefly summarizes the early work on phosphorus removal in activated sludge plants in the U.S.A. and observed that such removals only occurred in low SRT plants of the plug flow type and in the Phostrip plants, neither designed for full nitrification. The discovery of simultaneous nitrogen and phosphorus removal, as well as full-scale experiments are discussed. The Phoredox process was proposed utilizing internal recycling for the removal of nitrates and an anaerobic first stage in which the incoming feed is used to obtain the necessary anaerobic conditions, essential as a conditioning step for the uptake of phosphorus. Proposed mechanisms are discussed.

Comparison of nutrient removal efficiency between pre- and post-denitrification wastewater treatments

2006 ◽  
Vol 53 (9) ◽  
pp. 169-175 ◽  
Author(s):  
K. Hamada ◽  
T. Kuba ◽  
V. Torrico ◽  
M. Okazaki ◽  
T. Kusuda
Keyword(s):  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Biological Nutrient Removal ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Nutrient Removal Efficiency ◽  
Polyphosphate Accumulating Organisms ◽  
Biological Phosphorus ◽  
Denitrification Process

A shortage of organic substances (COD) may cause problems for biological nutrient removal, that is, lower influent COD concentration leads to lower nutrient removal rates. Biological phosphorus removal and denitrification are reactions in which COD is indispensable. As for biological simultaneous nitrogen and phosphorus removal systems, a competition problem of COD utilisation between polyphosphate accumulating organisms (PAOs) and non-polyphosphate-accumulating denitrifiers is not avoided. From the viewpoint of effective utilisation of limited influent COD, denitrifying phosphorus-removing organisms (DN-PAOs) can be effective. In this study, DN-PAOs activities in modified UCT (pre-denitrification process) and DEPHANOX (post-denitrification ptocess) wastewater treatments were compared. In conclusion, the post-denitrification systems can use influent COD more effectively and have higher nutrient removal efficiencies than the conventional pre-denitrification systems.

Second Generation Oxidation Ditches: Advanced Technology in Simple Design

1993 ◽  
Vol 27 (9) ◽  
pp. 105-113
Author(s):  
G. Petersen ◽  
H. Nour El-Din ◽  
E. Bundgaard
Keyword(s):  
Phosphorus Removal ◽  
Waste Water Treatment ◽  
Advanced Technology ◽  
Simple Design ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Effluent Quality ◽  
The Right ◽  
Biological Nitrogen ◽  
Biological Phosphorus

Oxidation ditcb systems for waste water treatment at various demands for effluent quality with regard to BOD, nitrogen and phosphorus are presented. Simple design for only BOD-removal and nitrification as well as designs for advanced treatment including biological nitrogen and biological phosphorus removal are presented, and full scale results from more than 15 years of operation are shown. The simple design and price competitive construction can none the less produce effluent qualities below 15 mg BOD/l, 8 mg N/l and 1.5 mg P/l if the right oxidation ditcb combination is used.

scholarly journals Improving biological phosphorus removal in membrane bioreactors – a pilot study

2013 ◽  
Vol 4 (1) ◽  
pp. 25-33 ◽  
Author(s):  
S. Smith ◽  
G. Kim ◽  
L. Doan ◽  
H. Roh
Keyword(s):  
Pilot Study ◽  
Retention Time ◽  
Phosphorus Removal ◽  
Water Reuse ◽  
Oxygen Demand ◽  
Operating Conditions ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
N Removal ◽  
Biological Phosphorus

With increasing water reuse applications and possible stringent regulations of phosphorus content in secondary and tertiary effluent discharge in Florida, USA, alternative technologies beyond conventional treatment processes require implementation to achieve low phosphorus (P) and nitrogen (N) concentrations. A pilot scale membrane bioreactor (MBR) system, operated in Florida, adopted the University of Cape Town (UCT) biological process for the treatment of domestic wastewater. The system operated for 280 days at a wastewater treatment facility with total hydraulic retention time (HRT) of 7 h and sludge retention time (SRT) of 20 days. Operating conditions were controlled to maintain specific dissolved oxygen (DO) concentrations in the reactors, operate at suitable return activated sludge (RAS) rates and to waste from the appropriate reactor. This process favored biological phosphorus removal and achieved 94.1% removal efficiency. Additionally, chemical oxygen demand (COD) and N removal were achieved at 93.9% and 86.6%, respectively. Membrane operation and maintenance did not affect the biological P removal performance but enhanced the process given the different operating requirements compared to that required with the conventional UCT process alone. Conclusively, the result of the pilot study demonstrated improvement in biological phosphorus removal. The UCT-MBR process tested achieved average effluent nitrogen and phosphorus concentrations of 5 mg/L as N and 0.3 mg/L as P.

Removal of nitrogen and phosphorus using a new biofilm-activated-sludge system

1996 ◽  
Vol 34 (1-2) ◽  
pp. 315-322 ◽  
Author(s):  
J. X. Liu ◽  
J. W. van Groenestijn ◽  
H. J. Doddema ◽  
B. Z. Wang
Keyword(s):  
Activated Sludge ◽  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Optimum Conditions ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
The Mean ◽  
Scale Experiment ◽  
Biological Nitrogen

This paper describes a laboratory scale experiment using a combined biofilm and activated sludge process to enhance biological nitrogen and phosphorus removal. In the system, fibrous carriers were packed in an anoxic tank for the attached growth of denitrifying bacteria and the sludge of the clarifier was returned to the anaerobic tank to release phosphate. In this configuration, nitrification, denitrification and phosphorus removal could be performed at their respective optimum conditions. The influent was domestic wastewater; the mean concentrations of COD, NH4-N and total phosphorus in the influent were about 319 mg/l, 60 mg/l and 10 mg/l respectively. At a total HRT of the system of 20-30 hours, based on the influent flow of the system, and a temperature of 10-15°C, the mean concentrations of COD, NH4-N, NO3-N, NO2-N and total phosphorus in the effluent were about 39.4 mg/l, 1.3 mg/l, 13.4 mg/l, 0.6 mg/l, and 0.8 mg/l respectively.

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