| 1. |
- Cema, G., et al.
(författare)
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Deammonification in an aerobic Rotating Biological Contactor (RBC)
- 2008
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Ingår i: Int. Workshop Manage. Pollut. Emiss. Landfills Sludge. - 9780415433372 ; , s. 211-218
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Konferensbidrag (refereegranskat)abstract
- Leachate from landfills is a highly complex polluted wastewater. Landfill leachate with a high concentration of ammonium nitrogen is generally difficult to treat, efficiently. Furthermore, it can be very expensive when there is lack of an easily biodegradable carbon source. Combination of the nitrification/denitrification with the Anammox process can be a very attractive alternative. For the purpose of this study, a Rotating Biological Contactor (RBC) was used. The main objective of the research was to investigate the performance of the Anammox process that occurs together with heterotrophic denitrification in the same RBC. During the operation period the acclimation of biofilm to the Anammox process was successful at temperature not exceeding 20°C. Apparently, the process was not affected by a high concentration of nitrite up to 100 g NO2-N m-3 Additionally, it was shown that the Stover-Kincannon model could be used for description of the ammonium and nitrite removal rates.
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| 2. |
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| 3. |
- Cema, Grzegorz, et al.
(författare)
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Simultaneous nitrification, anammox and denitrification in aerobic rotating biological contactor (RBC) treating landfill leachate
- 2008
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Ingår i: Management of Pollutant Emission from Landfills and Sludge. - London : Taylor & Francis Group. - 9780415433372 ; , s. 211-218
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Bokkapitel (refereegranskat)abstract
- Leachate from landfills is a highly complex polluted wastewater. Landfill leachate with a high concentration of ammonium nitrogen is generally difficult to treat efficiently. Furthermore, it can be very expensive when there is a lack of an easily biodegradable carbon source. Combination of the nitrification/denitrification with the Anammox process can be a very attractive alternative. For the purpose of this study, a Rotating Biological Contactor (RBC) was used. The main objective of the research was to investigate the performance of the Anammox process that occurs together with heterotrophic denitrication in the same RBC. During the operation period, the acclimation of biofilm to the Anammox process was successful at temperature not exceeding 20C. Apparently, the process was not affected by a high concentration of nitrite up to 100 g NO2 Nm3. Additionally, it was shown that the Stover-Kineannon model could be used for description of the ammonium and nitrite removal rates. Leachate from landfills is a highly complex polluted wastewater. Landfill leachate with a high concentration of ammonium nitrogen is generally difficult to treat efficiently. Furthermore, it can be very expensive when there is a lack of an easily biodegradable carbon source. Combination of the nitrification/denitrification with the Anammox process can be a very attractive alternative. For the purpose of this study, a Rotating Biological Contactor (RBC) was used. The main objective of the research was to investigate the performance of the Anammox process that occurs together with heterotrophic denitrication in the same RBC. During the operation period, the acclimation of biofilm to the Anammox process was successful at temperature not exceeding 20C. Apparently, the process was not affected by a high concentration of nitrite up to 100 g NO2 Nm³. Additionally, it was shown that the Stover-Kineannon model could be used for description of the ammonium and nitrite removal rates.
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| 4. |
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| 5. |
- Cema, Grzegorz, et al.
(författare)
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Biological nitrogen removal from landfill leachate by deammonification assisted by heterotrophic denitrification in a rotating biological contactor (RBC)
- 2007
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Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 55:8-9, s. 35-42
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Tidskriftsartikel (refereegranskat)abstract
- Due to negative environmental effects of nitrogen discharge to recipients and increasingly W stringent effluent standards, effective nitrogen removal is necessity. Biological methods are the simplest in and cheapest way to treat wastewater; however, it may become an extremely expensive option when high influent nitrogen concentrations are measured and there is a lack of biodegradable organic carbon. Therefore, there is a great need to find new solutions and improve existing technologies. The deammonification is an excellent example of such a new process that requires considerably low CA amounts of organic carbon and oxygen in comparison to conventional nitrification/denitrification. The main objective of presented research was to investigate an Anammox process accompanied with autotrophic nitrification and heterotrophic denitrification in one rotating biological contactor (RBC). During the research period, it was possible to carry out the Anammox process in low temperature below 20 degrees C. Additionally, it was found that the process is insensitive to high nitrite concentration in the reactor, up to 100 g NO2-N m(-3), resulting only in a temporary decrease in removal rates. Furthermore, analysis of data indicated that the Stover-Kincannon model can be used for the description of ammonium and nitrite removal processes.
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| 6. |
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| 7. |
- Cema, Grzegorz, et al.
(författare)
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Dissolved oxygen as a factor influencing nitrogen removal rates in a one-stage system with partial nitritation and Anammox process
- 2011
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Ingår i: Water Science and Technology. - : IWA Publishing. - 0273-1223 .- 1996-9732. ; 64:5, s. 1009-1015
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Tidskriftsartikel (refereegranskat)abstract
- A biofilm system with Kaldnes biofilm carrier was used in these studies to cultivate bacteria responsible for both partial nitritation and Anammox processes. Due to co-existence of oxygen and oxygen-free zones within the biofilm depth, both processes can occur in a single reactor. Oxygen that inhibits the Anammox process is consumed in the outer layer of the biofilm and in this way Anammox bacteria are protected from oxygen. The impact of oxygen concentration on nitrogen removal rates was investigated in the pilot plant (2.1 m(3)), supplied with reject water from the Himmerfjarden Waste Water Treatment Plant. The results of batch tests showed that the highest nitrogen removal rates were obtained for a dissolved oxygen (DO) concentration around 3 g O(2) m(-3). At a DO concentration of 4 g O(2) m(-3), an increase of nitrite and nitrate nitrogen concentrations in the batch reactor were observed. The average nitrogen removal rate in the pilot plant during a whole operating period oscillated around 1.3 g N m(-2)d(-1) (0.3 +/- 0.1 kg N m(-3)d(-1)) at the average dissolved oxygen concentration of 2.3 g O(2) m(-3). The maximum value of a nitrogen removal rate amounted to 1.9 g N m(-2)d(-1) (0.47 kg N m(-3)d(-1)) and was observed for a DO concentration equal to 2.5 g O(2) m(-3). It was observed that increase of biofilm thickness during the operational period, had no influence on nitrogen removal rates in the pilot plant.
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