Treatment of Dimethoate Aqueous Solution by Using Ultrasonic Airlift Loop Reactor

Ultrasonic airlift loop reactor (UALR) shows potential and wide application for wastewater treatment. In this paper the performance and efficiency of UALR in dimethoate degradation were presented. The effects of O3 flow rate, ultrasonic intensity and initial concentration of dimethoate on degradation rate were investigated. UALR imposed a synergistic effect combining sonochemical merit with high O3 transfer rate. The results showed that UALR not only increased degradation rate, but also was better than the simple sum of degradation by O3 and ultrasound separately. Under the operation conditions of O3 flow of 0.34 m3·h−1, ultrasonic intensity 3.71 W·cm−2, and initial concentration of dimethoate at 20 mg·L−1, the degradation rate of dimethoate increased to 80%. UALR seems an advisable choice for treating organic wastewater and this process may have wide application prospect in industry.