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Performance analysis and optimization of autotrophic nitrogen removal in different reactor configurations: a modeling study

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Abstract
In most modern wastewater treatment plants (WWTP) nitrogen, which is generally in the form of ammonium or organic nitrogen, is removed by biological nitrification - denitrification. This process consists of two steps: nitrification, where ammonium is oxidized to nitrate and denitrification, in which the formed nitrate is reduced to nitrogen gas under anoxic conditions by means of COD (Chemical Oxygen Demand) (Metcalf and Eddy 1991). However, there are some serious disadvantages: aeration costs, excessive sludge production and dependence on (external) carbon source. A new process for high loaded nitrogen streams, including partial nitritation and Anammox (ANaerobic AMMonium OXidation), eliminates these disadvantages. Half of the incoming ammonium is transformed to nitrite in the first step (partial nitritation, rate NH4+/NO2- = 1). Next, the formed nitrite and the remaining ammonium is converted into nitrogen gas under anaerobic conditions (Anammox). This process can be applied to treat ammonium-rich wastewater, for instance water from a sludge digester at a WWTP (Mulder et al. 2001; Hellinga et al. 1998). The drawback of the Anammox bacteria is their slow growth rate, which has a negative effect on the start-up time of such reactor, making experimental studies difficult. As a consequence, preventing the wash out of these organisms is in this case very important (Strous et al. 1998; Jetten et al. 1998). The goal of this thesis was testing different reactor configurations in order to analyze the influence of varying parameters on these systems. The three elaborately tested CASR reactors (Conventional Activated Sludge Reactor) are an oxygen limited partial nitritation reactor, an Anammox reactor and a combination of partial nitritation and Anammox in one single reactor. All three were tested under different parameter settings of temperature, pH, biomass retention, nitrogen load, COD and HRT (Hydraulic Retention Time). The software program WEST® (MOSTforWATER) was used to obtain the results of this modeling study.

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MLA
Vandeweyer, Helge, A Monballiu, BD Meesschaert, et al. “Performance Analysis and Optimization of Autotrophic Nitrogen Removal in Different Reactor Configurations: a Modeling Study.” IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts. 2009. Print.
APA
Vandeweyer, H., Monballiu, A., Meesschaert, B., & Van Hulle, S. (2009). Performance analysis and optimization of autotrophic nitrogen removal in different reactor configurations: a modeling study. IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts. Presented at the 1st IWA BeNeLux Regional Young Water Professionals Conference.
Chicago author-date
Vandeweyer, Helge, A Monballiu, BD Meesschaert, and Stijn Van Hulle. 2009. “Performance Analysis and Optimization of Autotrophic Nitrogen Removal in Different Reactor Configurations: a Modeling Study.” In IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts.
Chicago author-date (all authors)
Vandeweyer, Helge, A Monballiu, BD Meesschaert, and Stijn Van Hulle. 2009. “Performance Analysis and Optimization of Autotrophic Nitrogen Removal in Different Reactor Configurations: a Modeling Study.” In IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts.
Vancouver
1.
Vandeweyer H, Monballiu A, Meesschaert B, Van Hulle S. Performance analysis and optimization of autotrophic nitrogen removal in different reactor configurations: a modeling study. IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts. 2009.
IEEE
[1]
H. Vandeweyer, A. Monballiu, B. Meesschaert, and S. Van Hulle, “Performance analysis and optimization of autotrophic nitrogen removal in different reactor configurations: a modeling study,” in IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts, Eindhoven, The Netherlands, 2009.
@inproceedings{902338,
  abstract     = {In most modern wastewater treatment plants (WWTP) nitrogen, which is generally in the form of ammonium or organic nitrogen, is removed by biological nitrification - denitrification. This process consists of two steps: nitrification, where ammonium is oxidized to nitrate and denitrification, in which the formed nitrate is reduced to nitrogen gas under anoxic conditions by means of COD (Chemical Oxygen Demand) (Metcalf and Eddy 1991). However, there are some serious disadvantages: aeration costs, excessive sludge production and dependence on (external) carbon source.
A new process for high loaded nitrogen streams, including partial nitritation and Anammox (ANaerobic AMMonium OXidation), eliminates these disadvantages. Half of the incoming ammonium is transformed to nitrite in the first step (partial nitritation, rate NH4+/NO2- = 1).
Next, the formed nitrite and the remaining ammonium is converted into nitrogen gas under anaerobic conditions (Anammox). This process can be applied to treat ammonium-rich wastewater, for instance water from a sludge digester at a WWTP (Mulder et al. 2001; Hellinga et al. 1998).
The drawback of the Anammox bacteria is their slow growth rate, which has a negative effect on the start-up time of such reactor, making experimental studies difficult. As a consequence, preventing the wash out of these organisms is in this case very important (Strous et al. 1998; Jetten et al. 1998). The goal of this thesis was testing different reactor configurations in order to analyze the influence of varying parameters on these systems. The three elaborately tested CASR reactors (Conventional Activated Sludge Reactor) are an oxygen limited partial nitritation reactor, an Anammox reactor and a combination of partial nitritation and Anammox in one single reactor. All three were tested under different parameter settings of temperature, pH, biomass retention, nitrogen load, COD and HRT (Hydraulic Retention Time). The software program WEST® (MOSTforWATER) was used to obtain the results of this modeling study.},
  author       = {Vandeweyer, Helge and Monballiu, A and Meesschaert, BD and Van Hulle, Stijn},
  booktitle    = {IWA BeNeLux Regional Young Water Professionals Conference, 1st, Abstracts},
  language     = {eng},
  location     = {Eindhoven, The Netherlands},
  pages        = {?},
  title        = {Performance analysis and optimization of autotrophic nitrogen removal in different reactor configurations: a modeling study},
  year         = {2009},
}