Effects of tetracycline on simultaneous biological wastewater nitrogen and phosphorus removal

RSC Advances ◽  
2015 ◽  
Vol 5 (73) ◽  
pp. 59326-59334 ◽  
Author(s):  
A. Chen ◽  
Y. Chen ◽  
C. Ding ◽  
H. Liang ◽  
B. Yang
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Protective Role ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Total Nitrogen Removal

The presence of 2 and 5 mg L−1of tetracycline decreased total nitrogen removal. Tetracycline induced EPS release and decreased its protective role on cells. Denitrifiers instead of nitrifiers were negatively affected by tetracycline.

Evaluation of a novel oxidation ditch system for biological nitrogen and phosphorus removal from domestic sewage

2010 ◽  
Vol 62 (8) ◽  
pp. 1745-1754 ◽  
Author(s):  
X. Chen ◽  
T. Fujiwara ◽  
K. Ohtoshi ◽  
S. Inamori ◽  
K. Nakamachi ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Domestic Sewage ◽  
Control Technology ◽  
Oxidation Ditch ◽  
Anoxic Zone ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Do Control ◽  
Biological Nitrogen

A novel oxidation ditch system using anaerobic tanks and innovative dual dissolved oxygen (DO) control technology is proposed for biological nitrogen and phosphorus removal from domestic sewage. A continuous bench-scale experiment running for more than 300 days was performed to evaluate the system. Monitoring and controlling the airflow and recirculation flow rate independently using DO values at two points along the ditch permitted maintenance of aerobic and anoxic zone ratios of around 0.30 and 0.50, respectively. The ability to optimize aerobic and anoxic zone ratios using the dual DO control technology meant that a total nitrogen removal efficiency of 83.2–92.9% could be maintained. This remarkable nitrogen removal performance minimized the nitrate recycle to anaerobic tanks inhibiting the phosphorus release. Hence, the total phosphorus removal efficiency was also improved and ranged within 72.6–88.0%. These results demonstrated that stabilization of the aerobic and anoxic zone ratio by dual DO control technology not only resulted in a marked improvement of nitrogen removal, but it also enhanced phosphorus removal.

Autotrophic nitrogen removal after ureolytic phosphate precipitation to remove both endogenous and exogenous nitrogen

2013 ◽  
Vol 67 (7) ◽  
pp. 1425-1433 ◽  
Author(s):  
E. Desmidt ◽  
A. Monballiu ◽  
H. De Clippeleir ◽  
W. Verstraete ◽  
B. D. Meesschaert
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Energy Prices ◽  
Potato Processing ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Treatment Technologies ◽  
The One ◽  
Biological Nitrogen ◽  
Autotrophic Nitrogen Removal

Anaerobic digestion yields effluents rich in ammonium and phosphate and poor in biodegradable organic carbon, thereby making them less suitable for conventional biological nitrogen and phosphorus removal. In addition, the demand for fertilizers is increasing, energy prices are rising and global phosphate reserves are declining. This requires both changes in wastewater treatment technologies and implementation of new processes. In this contribution a description is given of the combination of a ureolytic phosphate precipitation (UPP) and an autotrophic nitrogen removal (ANR) process on the anaerobic effluent of a potato processing company. The results obtained show that it is possible to recover phosphate as struvite and to remove the nitrogen with the ANR process. The ANR process was performed in either one or two reactors (partial nitritation + Anammox). The one-reactor configuration operated stably when the dissolved oxygen was kept between 0.1 and 0.35 mg L−1. The best results for the two-reactor system were obtained when part of the effluent of the UPP was fully nitrified in a nitritation reactor and mixed in a 3:5 volumetric ratio with untreated ammonium-containing effluent. A phosphate and nitrogen removal efficiency of respectively 83 ± 1% and of 86 ± 7% was observed during this experiment.

High rate and compact two-stage post-denitrification process with single-sludge pre-denitrification

1996 ◽  
Vol 34 (1-2) ◽  
pp. 467-475
Author(s):  
Kazuhiro Mikawa ◽  
Hiroyoshi Emori ◽  
Tadashi Takeshima ◽  
Eiichi Ishiyama ◽  
Kazuhiro Tanaka
Keyword(s):  
Total Nitrogen ◽  
Phosphorus Removal ◽  
Sewage Treatment ◽  
High Rate ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Two Stage ◽  
Treatment Processes ◽  
Closed Water ◽  
Denitrification Process

For the sewage treatment plants near rivers and closed water bodies in urbanized areas there is a growing demand for introduction of advanced treatment processes for nitrogen and phosphorus removal for water quality conservation and environmental protection. In order to achieve the total nitrogen content of below 10 mg/L in effluent, a compact single sludge pre-denitrification process by dosing immobilized pellets in the nitrification tank (PEGASUS process) has been already developed (Tanaka et al. 1992). Furthermore, a two-stage PEGASUS process and a PEGASUS process with post-denitrification were developed and investigated for nitrogen removal. Both processes achieved the total nitrogen of less than 5mg/L.

Extracellular polymeric substances in relation to nutrient removal from a sequencing batch biofilm reactor

2001 ◽  
Vol 43 (6) ◽  
pp. 185-192 ◽  
Author(s):  
E. Choi ◽  
Z. Yun ◽  
Y. Park ◽  
H. Lee ◽  
H. Jeong ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Biofilm Reactor ◽  
Bulk Liquid ◽  
Growth Media ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biofilm Growth ◽  
Biological Nitrogen

Experimental investigations were performed to determine the possibility of simultaneous biological nitrogen and phosphorus removal during various biofilm processes in conjunction with biofilm characterisation, especially extracellular polymeric substance (EPS). Since biological nitrogen removal requires an alternating exposure of anaerobic-anoxic-oxic conditions in the bulk liquid that surrounds the biofilm growth media, a sequencing batch reactor (SBR)-type operation was used. Various materials including expanded clay, polystyrene, polyurethane, and acrylic materials were used as the biofilm growth support medium. Simultaneous nitrogen and phosphorus removal was possible with SBR, but it was postulated that nutrient removal efficiencies varied with film thickness. Thinner biofilm promoted nitrification and phosphorus removal, but thicker biofilm enhanced denitrification and reduced phosphorus removal. EPS contents were similar regardless of support media types or biofilm configuration, but EPS contents gradually increased as the film growth continued after backwashing. EPS contents were increased with increased nitrogen removal, but it was difficult to define its relation with phosphorus removal. In addition, suspended solids removal was correlated well with the EPS content in the biofilms.

Effect of pH Value on Nitrogen and Phosphorus Removal in Biochemical Reactor

2013 ◽  
Vol 777 ◽  
pp. 263-267
Author(s):  
Hong Wei Rong ◽  
Meng Xiang Lin ◽  
Ke Fang Zhang ◽  
Chao Sheng Zhang ◽  
Heng Ning Xue ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Ph Value ◽  
Acidic Environment ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Wastewater Treatment Process ◽  
Biochemical Reactors

pH value is one of the most important factors which affect the nitrogen and phosphorus removal in the wastewater treatment process. The influences of potential of hydrogen on nitrogen and phosphorus removal of wastewater were studied in this study. The results revealed that: (1) faintly acidic environment was conducive to biological phosphorus removal in biochemical reactors with FeCl3, PFS and PAS but not with Al2(SO4)3.On the other hand, synergistic effect between the microorganism and coagulants ( FeCl3, PFS, Al2(SO4)3 and PAS) was confirmed in this study. (2) faintly acidic environment was favorable to the nitrogen removal in biochemical reactors with PFS and PAS while the faintly alkaline environment was conducive to the nitrogen removal with FeCl3 and Al2(SO4)3. And there was no synergistic effect between the microorganism and coagulants.

Effect of Dissolved Oxygen on Nitrogen and Phosphorus Removal Rate in Biolak Process

2013 ◽  
Vol 779-780 ◽  
pp. 1629-1633
Author(s):  
Yu Kun Ju ◽  
He Li Wang ◽  
Qiang Zhang ◽  
Jia Le Xing
Keyword(s):  
Dissolved Oxygen ◽  
Removal Efficiency ◽  
Total Nitrogen ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Nitrogen Efficiency ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Oxic Zone

In this research, the domestic wastewater was treated by full-scale Biolak/A2O process. The effects of dissolved oxygen (DO) on nitrogen and phosphorus removal of the system in oxic zone were investigated. Controlling to DO at 0.8-1.5 mg/L, the treatment efficiency of system was near optimal with the total nitrogen efficiency of 69.45%. The simultaneous nitrification and denitrification could be achieved under this condition. Based on the calculation equations and transformation pathways of nutrients, about 23.71% total nitrogen (TN) was removed by multistage A/O system in the oxic tank. When DO was 1.0-3.0mg/L, the total phosphorus (TP) removal efficiency was the highest at 73.97%. DO in the range of 1.0-1.5mg/L was optimal for the nutrient removal in Biolak/A2O process, removal efficiency of TN and TP were 68.87% and 73.68%. TN and TP of the effluent were 12.02mg/L and 0.95mg/L, respectively.

Impact of different recirculation schemes on nitrogen removal and overall performance of a laboratory scale MBR

2007 ◽  
Vol 56 (6) ◽  
pp. 115-124 ◽  
Author(s):  
U. Bracklow ◽  
L. Manigas ◽  
A. Drews ◽  
M. Vocks ◽  
M. Barjenbruch ◽  
...  
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Membrane Bioreactors ◽  
Laboratory Scale ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Uptake Rates ◽  
Overall Performance ◽  
Biological Phosphorus

For membrane bioreactors (MBR) with enhanced nutrients removal, rather complex recirculation schemes based on the biological requirements are commonly recommended. The aim of this work was to evaluate other recirculation options. For a laboratory scale MBR, four different recirculation schemes were tested. The MBR was operated with COD degradation, nitrification, post-denitrification without carbon dosing and biological phosphorus removal. For all configurations, efficient COD, nitrogen and phosphorus removal could be achieved. There were no big differences in elimination efficiency between the configurations (COD elimination: 96.6–97.9%, nitrogen removal: 89.7–92.1% and phosphorus removal: 97.4–99.4%). Changes in the degradation, release and uptake rates were levelled out by the changes in contact time and biomass distribution. With relatively constant outflow concentrations, different configurations are still interesting with regard to oxygen consumption, simplicity of plant operation or support of certain degradation pathways such as biological phosphorus removal or denitrification.

Nitrogen and Phosphorus Removal in a Subsurface-Flow Reed Bed

1998 ◽  
Vol 33 (2) ◽  
pp. 319-330 ◽  
Author(s):  
Garba Laouali ◽  
Jacques Brisson ◽  
Linda Dumont ◽  
Gilles Vincent
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Phosphate Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Water Courses ◽  
Reed Bed

Abstract During the last decades, there has been a growing concern over phosphorus and nitrogen removal in wastewater treatment systems. Excessive loads of these nutrients have been implicated in the eutrophication of water courses. Although effectiveness of constructed reed beds for primary and secondary wastewater treatments is well established, their capacity for nutrient removal is not as well documented, especially under northern temperate climates. We monitored nutrient removal in the experimental reed bed wastewater treatment of the Biosphère de Montréal, a museum entirely devoted to the important role of water in the ecosystem. Over the first 2 years of operation, nutrient removal during plant growing season averaged 60% for total nitrogen, 53% for Kjeldahl nitrogen, 73% for total phosphorus and 94% for phosphate. Removal remains acceptable in winter despite a slight decrease in efficiency. Nitrification-deni-trification appears to be the main mechanism responsible for nitrogen removal, while precipitation and adsorption account for most of the phosphorus removal.

Modelling and simulation revealing mechanisms likely responsible for achieving the nitrite pathway through aeration control

2010 ◽  
Vol 61 (6) ◽  
pp. 1459-1465 ◽  
Author(s):  
A. Guisasola ◽  
M. Marcelino ◽  
R. Lemaire ◽  
J. A. Baeza ◽  
Z. Yuan
Keyword(s):  
Nitrogen Removal ◽  
Phosphorus Removal ◽  
Control Strategies ◽  
Oxygen Demand ◽  
Modelling And Simulation ◽  
Simultaneous Nitrification And Denitrification ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biological Nitrogen ◽  
Phase Length

Nitrogen removal via nitrite has recently gained a lot of interest because it results in significant savings in both aeration costs and COD (chemical oxygen demand) requirements for denitrification, when compared to the conventional biological nitrogen removal via nitrate. The effectiveness of two different control strategies to achieve the nitrite pathway in systems with sludge retention has been experimentally demonstrated: (i) control of aerobic phase length, with which aeration is terminated as soon as ammonia is completely oxidised; (ii) operation at low DO setpoints in the aerobic phase. These strategies have been extensively studied in nitrifying reactors and are currently applied in real systems achieving biological carbon, nitrogen and phosphorus removal. In this work, we aim to demonstrate, through modelling and simulation, that the competition between nitrite reducers and nitrite oxidisers for nitrite, rather than kinetic selection plays a major role in NOB washout. Moreover, the results show that the occurrence of simultaneous nitrification and denitrification under “aerobic” conditions is very helpful for the nitrite pathway obtainment and for a more efficient COD utilisation.

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