Design and evaluation of an automated oxygen uptake rate measurement system

1988 ◽  
Vol 15 (6) ◽  
pp. 1015-1021 ◽  
Author(s):  
Bijan Aidun ◽  
Daniel W. Smith
Keyword(s):  
Oxygen Uptake ◽  
Uptake Rate ◽  
Performance Test ◽  
Oxygen Uptake Rate ◽  
Performance Testing ◽  
Comparative Performance ◽  
Key Words Oxygen Uptake ◽  
Testing Procedures ◽  
Routine Monitoring ◽  
Routine Basis

The design and operating procedure for a newly developed automatic oxygen uptake rate (OUR) measurement apparatus is presented. This unit, with the aid of a microcomputer, is capable of collecting a volume of sample, aerating the sample, measuring the oxygen concentration at preselected times, and calculating the oxygen uptake rate on a routine basis. The OUR unit was evaluated using three different performance testing procedures. These were (1) a calibration and general performance test, (2) a long-term performance test, and (3) a detailed comparative performance test. The results of each of these tests are presented. The value and alternative uses of routine monitoring of OUR are discussed along the possible applications such as detection of toxic compounds entering the plant and adjustment of sludge return rates to match OUR values. Key words: oxygen uptake rate, activated sludge, microcomputer, process control, oxygen consumption.

Exposure to degraded coral habitat depresses oxygen uptake rate during exercise of a juvenile reef fish

Coral Reefs ◽  
2021 ◽  
Author(s):  
Adam T. Downie ◽  
Caroline M. Phelps ◽  
Rhondda Jones ◽  
Jodie L. Rummer ◽  
Douglas P. Chivers ◽  
...  
Keyword(s):  
Oxygen Uptake ◽  
Reef Fish ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Juvenile Reef Fish

Mass transfer impacts in flocculent and granular biomass from SBR systems

2004 ◽  
Vol 50 (10) ◽  
pp. 203-212 ◽  
Author(s):  
D. Gapes ◽  
B.-M. Wilén ◽  
J. Keller
Keyword(s):  
Mass Transfer ◽  
Particle Size ◽  
Oxygen Uptake ◽  
Activated Sludge ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Batch Reactor ◽  
Average Particle Size ◽  
Gas Analysis ◽  
Average Particle

An experimental study was conducted to describe mass transfer impacts within nitrifying aggregates sourced from sequencing batch reactor (SBR) activated sludge systems. Flocculent and granular sludge with high nitrification activity was obtained in two laboratory SBR systems, supplied with a synthetic, ammonium-based feed. The flocculent biomass was fractionated using a sieving procedure, in order to obtain biomass fractions with different particle size distributions. The oxygen uptake rate (OUR) response to changes in dissolved oxygen concentration was measured under highly controlled conditions in a titrimetric and off-gas analysis (TOGA) sensor, and the results used to assess mass transfer effects. As the average particle size of the biomass increased, mass transfer limitations were found to increase significantly. Empirically fitted, apparent KS,O2 values were demonstrated to be highly dependent on particle size, and reflect the mass transfer limitations occurring in the aggregates within a given system. Such parameters thus have little to do with the actual biokinetic parameter from which they are derived. The results obtained from the TOGA sensor study were consistent with those obtained from a microelectrode study on the same nitrifying granules. Together, these studies add considerable weight to the conclusion that consideration of external and internal mass transfer limitations is vital to the accurate description of activated sludge treatment processes, particularly those with a high oxygen uptake rate.

Disturbance observer for estimation of oxygen uptake rate in an activated sludge reactor

2016 ◽  
Author(s):  
Francisco Jadilson dos Santos Silva ◽  
Euler C. T. de Macedo ◽  
Sebastian Y. C. Catunda ◽  
Carlos E. T. Dorea ◽  
Adrianus C. Van Haandel
Keyword(s):  
Oxygen Uptake ◽  
Activated Sludge ◽  
Uptake Rate ◽  
Disturbance Observer ◽  
Oxygen Uptake Rate ◽  
Activated Sludge Reactor

Biodegradability of wastewater – a method for COD-fractionation

2002 ◽  
Vol 45 (3) ◽  
pp. 25-34 ◽  
Author(s):  
J. Vollertsen ◽  
T. Hvitved-Jacobsen
Keyword(s):  
Oxygen Uptake ◽  
Differential Equations ◽  
Conceptual Model ◽  
Uptake Rate ◽  
Oxygen Uptake Rate ◽  
Microbial Transformations ◽  
Manual Method ◽  
Iterative Procedures

Characterization of wastewater for simulation of in-sewer transformations can be carried out by interpretation of oxygen uptake rate measurements in combination with a conceptual model of the microbial transformations involved. This interpretation can be done by iterative procedures by solving the differential equations constituting the model or by the application of a more “manual” method – the latter being the topic of this paper. Examples where different wastewaters are characterized illustrate the method.

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