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Modeling the Effect of External Carbon Source Addition under Different Electron Acceptor Conditions in Biological Nutrient Removal Activated Sludge Systems
journal contribution
posted on 2016-01-19, 00:00 authored by Xiang Hu, Kamil Wisniewski, Krzysztof Czerwionka, Qi Zhou, Li Xie, Jacek MakiniaThe aim of this study was to expand
the International Water Association
Activated Sludge Model No. 2d (ASM2d) to predict the aerobic/anoxic
behavior of polyphosphate accumulating organisms (PAOs) and “ordinary”
heterotrophs in the presence of different external carbon sources
and electron acceptors. The following new aspects were considered:
(1) a new type of the readily biodegradable substrate, not available
for the anaerobic activity of PAOs, (2) nitrite as an electron acceptor,
and (3) acclimation of “ordinary” heterotrophs to the
new external substrate via enzyme synthesis. The expanded model incorporated
30 new or modified process rate equations. The model was evaluated
against data from several, especially designed laboratory experiments
which focused on the combined effects of different types of external
carbon sources (acetate, ethanol and fusel oil) and electron acceptors
(dissolved oxygen, nitrate and nitrite) on the behavior of PAOs and
“ordinary” heterotrophs. With the proposed expansions,
it was possible to improve some deficiencies of the ASM2d in predicting
the behavior of biological nutrient removal (BNR) systems with the
addition of external carbon sources, including the effect of acclimation
to the new carbon source.