Development of airlift ultrasonic reactor for treatment of refractory material in westewater

For the treatment of including refractory material in wastewater, an airlif t ultrasonic reactor was proposed. The reactor was a bubble column with a d raft tube and an ultrasonic oscillator attached at the column bottom. The g as was sparged into the draft tube or into the annulus between column and d raft tube. The gas velocity was changed and the apparent decomposition reac tion rate constant of tetraphenylporhyrine tetrasulfonic acid was measured. Regardless of the mode of sparging gas, the apparent reaction rate constan t increased with increasing gas velocity. To examine the effects of liquid and gas velocities on the apparent reactio n rate constant in the airlift ultrasonic reactor, a tubular reactor with a n ultrasonic oscillator was used. In the tubular reactor, the liquid and ga s velocities were independently controlled, and the apparent reaction rate constant was measured. The apparent reaction rate constant increased with i ncreasing liquid velocity or with increasing gas holdup. The effects of liq uid velocity and gas holdup were expressed by experimental equations. For t he apparent reaction rate constants in airlift ultrasonic reactor, the resu lts calculated from experimental equations agreed well with the measured da ta within an error of +/- 30%.