Use of carbon dioxide evolution rate for determining heterotrophic yield and characterising denitrifying biomass

The aim of this work was to show the potentiality of carbon dioxide evolution rate measurement (CER) in characterisation of heterotrophic biomass, especially in anoxic conditions, in view of modelling and design denitrifying processes. The carbon dioxide evolution rate (CER) was determined in a resp...

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Bibliographic Details
Published in:Water science and technology 1999, Vol.39 (1), p.139-146
Main Authors: Spérandio, M., Urbain, V., Audic, J.M., Paul, E.
Format: Article
Language:English
Subjects:
Activated sludge
Anoxia
Anoxic conditions
Applied sciences
Biological and medical sciences
Biological treatment of waters
Biomass
Biotechnology
Carbon dioxide
carbon dioxide evolution rate
Coefficients
correction factor
denitrification
Environment and pollution
Evolution
Evolutionary design method
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General purification processes
Industrial applications and implications. Economical aspects
Infrared analysis
Modelling
Organic carbon
Pollution
Ratios
Respirometers
respirometry
sludge yield
Wastewaters
Water treatment and pollution
Yields
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Summary:The aim of this work was to show the potentiality of carbon dioxide evolution rate measurement (CER) in characterisation of heterotrophic biomass, especially in anoxic conditions, in view of modelling and design denitrifying processes. The carbon dioxide evolution rate (CER) was determined in a respirometer by infrared analysis associated to a modelling technique. During anoxic and aerobic batch experiments CER was qualitatively correlated with other respirometric methods (OUR and NUR) and with organic carbon consumption. Yield coefficients were determined under aerobic (YH) and anoxic (YHD) conditions by means of carbon balances using CER and organic carbon measurements. Compared to the COD balances, accuracy of the yield estimation was improved and results obtained were not significantly different Measured anoxic yields were systematically lower than aerobic ones, and the observed ratios between them were in the range from 0.66 to 0.85. By comparing aerobic and anoxic CER, two methods were proposed to determine the correction factor for anoxic growth ηg. The first results obtained were consistent with those given by the classical method (NUR/OUR).
ISSN:0273-1223
1996-9732
DOI:10.1016/S0273-1223(98)00783-5