Effects of impurities on oxygen transfer rates in diffused aeration systems

A series of unsteady-state reaeration tests were performed in a 500-L tank at 0.81–4.58 m 3/h diffused-air flow rate and 288–302 K water temperature. Three different types of impurities: soybean oil, surfactant, and diatomaceous earth were doped to simulate the impurities in wastewaters and the effe...

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Bibliographic Details
Published in:Water research (Oxford) 2001-09, Vol.35 (13), p.3041-3048
Main Authors: Chern, Jia-Ming, Chou, Shun-Ren, Shang, Chou-Sheng
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric Pressure
Biological and medical sciences
Biological treatment of waters
Biotechnology
bubble aeration
Diatomaceous Earth - chemistry
Diffusion
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
General purification processes
Industrial applications and implications. Economical aspects
Kinetics
mass transfer
Mathematics
Models, Chemical
Oxygen - chemistry
Pollution
soybean oil
Soybean Oil - chemistry
Surface-Active Agents - chemistry
surfactant
suspended solids
Temperature
Wastewaters
Water - chemistry
Water Pollutants, Chemical - metabolism
Water treatment and pollution
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Summary:A series of unsteady-state reaeration tests were performed in a 500-L tank at 0.81–4.58 m 3/h diffused-air flow rate and 288–302 K water temperature. Three different types of impurities: soybean oil, surfactant, and diatomaceous earth were doped to simulate the impurities in wastewaters and the effects of the impurities on the oxygen transfer rate were investigated. The ASCE and the two-zone oxygen mass-transfer models were used to analyze the unsteady-state reaeration data and the volumetric mass-transfer coefficients determined from the unsteady-state reaeration data were correlated as a function of the diffused-air flow rate, water temperature, and impurity concentration. The results showed that the alpha factors based on the ASCE model are less sensitive to the impurity concentration while the presence of the impurities significantly reduces the alpha factors in the gas bubble zone. The saturation DO concentration and volumetric oxygen mass-transfer rate can be predicted by the two-zone model along with the correlation obtained in this study.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(01)00031-8