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Nitritation Performance in Membrane Aerated Biofilm Reactors differs from conventional Biofilm Systems

Lackner, Susanne and Terada, Akihiko and Horn, Harald and Henze, Mogens and Smets, Barth F. (2010):
Nitritation Performance in Membrane Aerated Biofilm Reactors differs from conventional Biofilm Systems.
In: Water Research, pp. 6073-6084, 44, (20), [Article]

Abstract

Nitrogen removal via nitrite has gained increasing attention in recent years due to its potential cost savings. Membrane-aerated biofilm reactors (MABRs) are one potential technology suitable to achieve nitritation. In this study we compared lab scale MABRs with conventional biofilm reactors to evaluate the influence of environmental conditions and operational parameters on nitritation performance. The oxygen mass transfer rate is postulated as a crucial parameter to control nitritation in the MABR: Clean water measurements showed significant underestimation of the total oxygen mass transfer, however, accurate determination of the oxygen mass transfer coefficient (k(m)) of the system could be achieved by adjusting the liquid-phase mass transfer resistance in the constructed model. Batch experiments at different initial ammonium concentrations revealed that the conventional biofilm geometry was superior for nitritation compared to MABRs. These differences were reflected well in estimates of the oxygen affinity constants of the key microbial players, AOB and NOB (K(O,AOB) < K(O,NOB) (in both systems) and K(O,NOB) values smaller in the MABR vs. the conventional biofilm system). It also appeared that - in addition to oxygen limitation - the absolute and relative substrate concentrations in the biofilm (esp. of oxygen) are very important for successful nitritation. Initial biomass composition, furthermore, impacted reactor performance in the MABR systems indicating the need for appropriate inoculum choice.

Item Type: Article
Erschienen: 2010
Creators: Lackner, Susanne and Terada, Akihiko and Horn, Harald and Henze, Mogens and Smets, Barth F.
Title: Nitritation Performance in Membrane Aerated Biofilm Reactors differs from conventional Biofilm Systems
Language: English
Abstract:

Nitrogen removal via nitrite has gained increasing attention in recent years due to its potential cost savings. Membrane-aerated biofilm reactors (MABRs) are one potential technology suitable to achieve nitritation. In this study we compared lab scale MABRs with conventional biofilm reactors to evaluate the influence of environmental conditions and operational parameters on nitritation performance. The oxygen mass transfer rate is postulated as a crucial parameter to control nitritation in the MABR: Clean water measurements showed significant underestimation of the total oxygen mass transfer, however, accurate determination of the oxygen mass transfer coefficient (k(m)) of the system could be achieved by adjusting the liquid-phase mass transfer resistance in the constructed model. Batch experiments at different initial ammonium concentrations revealed that the conventional biofilm geometry was superior for nitritation compared to MABRs. These differences were reflected well in estimates of the oxygen affinity constants of the key microbial players, AOB and NOB (K(O,AOB) < K(O,NOB) (in both systems) and K(O,NOB) values smaller in the MABR vs. the conventional biofilm system). It also appeared that - in addition to oxygen limitation - the absolute and relative substrate concentrations in the biofilm (esp. of oxygen) are very important for successful nitritation. Initial biomass composition, furthermore, impacted reactor performance in the MABR systems indicating the need for appropriate inoculum choice.

Journal or Publication Title: Water Research
Volume: 44
Number: 20
Divisions: 13 Department of Civil and Environmental Engineering Sciences > Institute IWAR > Wastewater Engineering
13 Department of Civil and Environmental Engineering Sciences > Institute IWAR
13 Department of Civil and Environmental Engineering Sciences
Date Deposited: 11 Apr 2018 08:19
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