Influence of dissolved oxygen and oxidation–reduction potential on the denitrification rate of activated sludge

The influence of low concentrations of dissolved oxygen (DO) and the oxidation-reduction potential (ORP) on the denitrification activity of activated sludge has been studied in batchwise experiments. The ORP was maintained at different levels by automatic titration with air and the denitrification a...

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Published in:Water science and technology 1994-01, Vol.30 (6), p.91-100
Main Authors: Lie, E, Welander, T
Format: Article
Language:English
Subjects:
Activated sludge
Denitrification
Detection
Dissolved oxygen
Electrode potentials
Low concentrations
Low level
Oxidation
Oxidation-reduction potential
Oxygen
Oxygen probes
Redox potential
Redox reactions
Reduction
Sludge
Titration
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Welander, T
description The influence of low concentrations of dissolved oxygen (DO) and the oxidation-reduction potential (ORP) on the denitrification activity of activated sludge has been studied in batchwise experiments. The ORP was maintained at different levels by automatic titration with air and the denitrification activity was determined by following the disappearance of nitrate. Oxygen was found to have a negative effect on denitrification even at lower concentrations than can be measured with conventional oxygen probes (
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The ORP was maintained at different levels by automatic titration with air and the denitrification activity was determined by following the disappearance of nitrate. Oxygen was found to have a negative effect on denitrification even at lower concentrations than can be measured with conventional oxygen probes (&lt;0.1 mg/L). The ORP was found to be a useful indicator of the DO concentration at this low level and the denitrification rate was found to decrease linearly with increasing ORP. However, the effect of the ORP on denitrification differed between sludges from different treatment plants. A linear relationship was also found between the ORP and the DO concentration in the region of measurable DO concentrations. 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ispartof Water science and technology, 1994-01, Vol.30 (6), p.91-100
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1996-9732
language eng
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source Alma/SFX Local Collection
subjects Activated sludge
Denitrification
Detection
Dissolved oxygen
Electrode potentials
Low concentrations
Low level
Oxidation
Oxidation-reduction potential
Oxygen
Oxygen probes
Redox potential
Redox reactions
Reduction
Sludge
Titration
title Influence of dissolved oxygen and oxidation–reduction potential on the denitrification rate of activated sludge
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