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1

Investigation for biological nitrogen removal from wastewater using simultaneous nitrification-denitrification technology

100%
Vaboliene G.
Annals of Warsaw Agricultural University - SGGW. Land Reclamation
|
2006
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nr 37
111-121
2
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Comprehensive analysis of soil nitrogen removal by catch crops based on growth and water use

100%
Yasutake D., Kondo K., Yamane S., Kitano M., Mori M., Fujiwara T.
International Agrophysics
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2016
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tom 30
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nr 3
3

The performance of species mixtures in nitrogen and phosphorus removal at different hydraulic retention times

100%
Wang H., Huang C.-C., Ge Y., Wu J. Z., Chang J.
Polish Journal of Environmental Studies
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2014
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tom 23
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nr 3
The effects of species compositions (two-species mixtures or monocultures) and hydraulic retention times (HRT; 1, 4, 8, 16, 24, 48 hours) on total nitrogen (TN) and total phosphorus (TP) removal from eutrophic water were studied in a constructed wetland. Two species mixtures showed higher efficiency to remove TN and TP than monocultures. Average removal efficiency of TN and TP was 49.6% and 34.0%, respectively. A longer HRT enhanced the removal efficiency of TN and TP, which suggested that species mixtures, HRT, and species mixtures × HRT interaction were useful for increasing the wastewater TN and TP removal.
4

Analysis of methods for determining DPAO fraction in phosphorus accumulating organisms

100%
Cyganecka A., Podedworna J., Zubrowska-Sudol M.
Polish Journal of Environmental Studies
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2011
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tom 20
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nr 2
We attempt to answer the question whether it is possible to directly compare the results of phosphorus uptake batch tests (PUBT) conducted by researchers who use different methods of determining the DPAOsto-PAOs ratio. This issue is raised because personally obtained results clearly show that DPAO fractions calculated with various methods proposed in the literature differ significantly. In the article the factors influencing the results of PUBT are discussed in detail. The study demonstrated that errors in determined values of DPAO fraction may be caused by the invitation of inappropriate value of reduction coefficient for anoxic conditions (η). The conclusion is that the η value should be accurately estimated in each test, independently for every active sludge.
5

Controlling of eutrophication in aquatic environments

100%
Gromiec M. J., Gromiec T. M.
Journal of Water and Land Development
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2010
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nr 14
6

Comparison of flat-sheet and hollow-fiber membrane modules in municipal wastewater treatment

100%
Bodik I., Blst'akova A., Dancova L., Sedlacek S.
Polish Journal of Environmental Studies
|
2009
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tom 18
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nr 3
331-340
The aim of this study was to test membrane modules immersed in pilot-scale domestic WWTP and in the aeration zone of the municipal WWTP Devínska Nová Ves - Bratislava. The first three phases were operated long-term without the employment of additional aeration. The fourth and fifth phases were operated with the employment of additional aeration applied as membrane cleaning in order to prevent the membrane from clogging. The operation of flat-sheet and hollow-fiber membrane modules showed similar results in permeate characteristics. Membrane modules were able to remove organic matter (as much as 92%) and more than 98% of NH₄-N in the long-term operation without activated sludge removal.
7
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Evaluation of natural minerals (zeolite and bentonite) for nitrogen compounds adsorption in different water temperatures suitable for aquaculture

100%
Sahin D., Oz M., Sertasi E., Oz U., Karsli Z., Aral O.
International Letters of Natural Sciences
|
2018
|
tom 71
In this study, it was aimed to determine the effects of zeolite and bentonite on the ammonium adsorption at different temperatures. In this research three trial groups with 3 repetitions were created for three different water temperatures (18±0.1°C, 24±0.0°C, 27±0.0°C). Experimental groups were prepared by adding NH4 + amount of 10.5 mg/l in 2 liters of water. After that, zeolite, zeolite+bentonite and bentonite were added into the bottles as 10 gram per liter. Water temperature, pH and TAN (Total Ammonium Nitrogen) values were determined during the trial period. At the end of trial TAN values at 27 °C were recorded as 10.103±0.11 mg/l, 9.227±0.13 mg/l and 7.933±0.17 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. At the end of trial TAN values at 24 °C were recorded as 10.027±0.17 mg/l, 9.282±0.15 mg/l and 8.336±0.15 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. At the end of trial TAN values at 18 °C were recorded as 9.012±0.28 mg/l, 7.702±0.14 mg/l and 6.594±0.14 mg/l in zeolite, zeolite+bentonite and bentonite groups, respectively. Maximum ammonium removal capacity, qe, was found to be 0.50 mg/g in the bentonite (18 °C). The TAN values determined at 18 °C were statistically more significant (p<0.05) than the TAN values obtained at 24 °C and 27 °C.
8

Ammonia nitrogen removal in a filtration process by zeolite modified manganese bed

100%
Anielak A. M., Wojnicz M., Piaskowski K.
Archiwum Ochrony Środowiska
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2006
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tom 32
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nr 2
9

Removal of nitrogen from pretreated wastewater in soil absorption system and denitrifying troughs

100%
Blazejewski R., Zytynski W.
Electronic Journal of Polish Agricultural Universities. Series Environmental Development
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1999
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tom 02
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nr 2
The paper presents results of two year field and laboratory investigations of a denitrifying system below leach lines. More than two days retention time was provided by siphoning of the denitrifying trough located 35 and 60 cm under the leach lines. Due to clogging and capillary suction in medium sand the seepage flow through the denitrifying troughs was limited to less than 10 % of the sewage inflow. Average efficiency of the total nitrogen removal was equal to 55 % after 3-4 days of travel time within the soil. To force wastewater to pass through the anaerobic bed within the trough two lateral vertical impermeable membranes are recommended.
10

The influence of hydraulic retention time and sludge age on the kinetics of nitrogen removal from leachate in SBR

100%
Klimiuk E., Kulikowska D.
Polish Journal of Environmental Studies
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2006
|
tom 15
|
nr 2
In the present study the influence of hydraulic retention time (HRT) in SBR and sludge age (SRT) on the effectiveness of nitrogen removal from leachate was investigated. Two series were performed. In each series, experiments were carried out in four SBR operated in parallel at HRT 12, 6, 3 and 2d, respectively. Each series differed in sludge age. In series 1, SRT decreased from 51 to 17d with shortening of HRT, while in series 2 it was about 2 times shorter. In each series the amount of nitrogen used on biomass synthesis, removal of nitrogen in denitrification and losses of ammonium during the aeration phase were estimated on the basis of material balance for all nitrogen forms in SBR cycle. It was shown that nitrogen consumption on biosynthesis was decreased linearly to the HRT increase. In series 1, the rate of ammonium nitrogen removal increased from 5.38 mgNNH4/g VSS·h to 7.36 mg NNH4/g VSS·h with HRT shortening from 12 to 3d, respectively. In series 2 the rate of ammonium nitrogen removal was nearly constant, regardless of HRT and on average it was 1.74 mg NNH4/g VSS·h. The losses of ammonium nitrogen in series 1 increased from 8.2 mg N/dm³.cycle in SBR 1 to 33.4 mg N/dm³.cycle in SBR 4, while in series 2 it was almost 2 times lower.
11

Niezawodność usuwania azotu ze ścieków w zbiorczej oczyszczalni z sekwencyjnym reaktorem biologicznym

80%
Bugajski P., Kaczor G., Bergel T.
Acta Scientiarum Polonorum. Formatio Circumiectus
|
2015
|
tom 14
|
nr 3
Celem badań była ocena niezawodności usuwania azotu ogólnego w zbiorczej oczyszczalni ścieków przy zastosowaniu metody niezawodności Weibulla. Badania prowadzono w okresie od 1 stycznia 2009 roku do 31 grudnia 2012 roku w zbiorczej oczyszczalni ścieków, której wielkość wyrażona Równoważną Liczbą Mieszkańców (RLM) wynosiła 101200. W analizowanym okresie pobrano i poddano analizie fizyczno-chemicznej 73 próbki ścieków surowych i oczyszczonych. Na podstawie uzyskanych wyników badań stwierdzono wyższe od przeciętnych stężenia azotu ogólnego w ściekach surowych. Duża nierównomierność stężeń związków azotu w ściekach dopływających miała wpływ na niestabilność procesów nitryfikacji i denitryfikacji w sekwencyjnym reaktorze biologicznym. Stwierdzona niestabilność procesów biologicznych skutkowała tym, iż w 46% przypadków stężenie azotu ogólnego w ściekach oczyszczonych było wyższe od wartości dopuszczalnej określonej w pozwoleniu wodnoprawnym dla tego obiektu. W pracy zaproponowano kilka rozwiązań problemów związanych z funkcjonowaniem reaktora biologicznego, które w przyszłości powinny skutkować zwiększoną skutecznością eliminacji azotu ogólnego w analizowanej oczyszczalni ścieków.
12

Nitrogen oxidation and reduction in aerated single-stage activated sludge process

80%
Bernat K., Wojnowska-Baryla I., Dobrzynska A.
Polish Journal of Environmental Studies
|
2003
|
tom 12
|
nr 4
This experiment was conducted in an aerated single-stage reactor at activated sludge concentration of about 3000 mg· dm-3. The influence of hydraulic retention time on nitrogen removal from rural wastewater was investigated. Hydraulic retention times were 24 and 12 hours. Two series were performed at a constant C/N ratio of 3.5. Enhancement of carbon removal from 83.8% to 87.6% was observed. An increase of activated sludge loading from 0.11g COD · g-1 · d-1 to 0.25 g COD · g-1 · d-1 did not cause total inhibition of nitrifica-tion, but nitrification efficiency decreased from 78.8% to 55.5%. Higher nitrogen removal efficiency (52%) was achieved in series I at 24 hours reaction time in contrast to shorter one (42%). Despite the fully aerobic condition, denitrification was observed. The denitrification process was pos-sible due to the use of accessibility of high amount of readily bioassimilable organic compounds. Obtained denitrification efficiency at C/N ratio 3.5 was about 50% during both experimental periods..
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