Modeling the effects of serial off-gas reuse on the performance of a hooded surface oxygen obsorption system
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Abstract
A numerical model was used to evaluate the performance of a surface agitation system designed to contact commercial oxygen with water. The modeled system was unique in that oxygen-rich off-gas, normally discharged to the atmosphere, was directed in serial reuse through additional contact stages receiving untreated water. A correlation between the agitator mass-transfer coefficient and power demand, needed to calibrate the model, was established using a single-stage (37 W) contactor of 1·18 m3 capacity. Additional tests, conducted with both single and three-stage equipment, verified model assumptions and performance predictions. Simulation runs indicated oxygen flow or power input required to meet a given effluent dissolved gas criterion can be substantially reduced by the off-gas reuse step; for example, to achieve an effluent dissolved oxygen of 24·1 mg/litre with a single stage agitator the oxygen feed rate needed was 61·5% greater than that required by a six-stage system receiving the same total power input (standard aeration efficiency, 0·5 kg/kW h; water flow rate, 100 litre/min; influent dissolved oxygen, 9·08 mg/litre at 15°C). The savings achieved increased with (1) greater target effluent dissolved oxygen concentrations, (2) lower oxygen feed rates, (3) higher input power levels, and (4) number of contact stages.
Suggested Citation
Watten, B.J., Meade, J.W., and Boyd, C.E., 1990, Modeling the effects of serial off-gas reuse on the performance of a hooded surface oxygen obsorption system: Aquacultural Engineering, v. 9, no. 2, p. 97-120, https://doi.org/10.1016/0144-8609(90)90014-Q.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Modeling the effects of serial off-gas reuse on the performance of a hooded surface oxygen obsorption system |
| Series title | Aquacultural Engineering |
| DOI | 10.1016/0144-8609(90)90014-Q |
| Volume | 9 |
| Issue | 2 |
| Year Published | 1990 |
| Language | English |
| Publisher | Elsevier |
| Contributing office(s) | Leetown Science Center |
| Description | 24 p. |
| First page | 97 |
| Last page | 120 |