Reoxygenation Rate for Airlift Inner Circulation Reactor

Airlift inner circulation reactor (AICR) consisting of beaker and built-in aeration tank was introduced in this paper. The Dissolved oxygen recovery (R DO ) was highly influenced by the ratios of the height of built-in aeration tank to the height of liquid level in reactor (R h/H ), the diameter of built-in aeration tank to the diameter of the reactor (R d/D ) and aeration rate (Q N ). Average R DO of 24.25 m.gm -3 .s -s and DO concentration of 8.97mg.l -1 were obtained at R d/D =0.47, R h/H =0.68 and Q N =1.0m 3 .m -3 .min -1 for aerating 370s at 17°C. The total transferred oxygen in 4L deoxidized water reached 35.89mg, which had an increase by 11.15% than that of the traditional airlift reactor (AR). The DO concentration was 88.33-9.34mg.l -1 for AICR, but it’s only 7.71-8.58mg.l -1 for AR.