Abstract
A computer model characterizing the performance of a u-tube oxygen absorption system was developed based on finite difference-mass transfer calculations. Performance was assessed in terms of oxygen utilization, transfer efficiency and economy. The system evaluated was unique in that oxygen not absorbed initially (off-gas) was captured and recycled. Mass transfer coefficients derived from pilot-scale test data were used to calibrate the computer model. A separate series of tests served to verify the effects of off-gas recycling as predicted by the program. Simulation data indicate off-gas recycling can result in substantial savings in variable and total costs of oxygen transfer with only a minor increase in capital expenditures, both initially and when amortized. The benefits achieved will increase with lower oxygen flow rates, deeper shaft depths, and low influent dissolved oxygen concentrations. Performance algorithms developed should be useful to those establishing design conditions for pure oxygen u-tube systems.
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