Treatment of Dimethoate Aqueous Solution by Using Ultrasonic Airlift Loop Reactor

Abstract

Abstract: 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.

Key words: dimethoate, ultrasound, airlift loop reactor, O₃, synergistic effect, degradation

摘要： 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.

关键词: dimethoate, ultrasound, airlift loop reactor, O₃, synergistic effect, degradation

LIU Yuenan, JIN Dong, LÜXiaoping, HAN Pingfang. Treatment of Dimethoate Aqueous Solution by Using Ultrasonic Airlift Loop Reactor[J]. , 2008, 16(3): 361-364.

刘越男, 金栋, 吕效平, 韩萍芳. Treatment of Dimethoate Aqueous Solution by Using Ultrasonic Airlift Loop Reactor[J]. , 2008, 16(3): 361-364.

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