中文摘要：

低浓度SO2烟气是造成大气污染、形成“酸雨”的主要气体之一。治理低浓度SO2烟气的污染是一项重要和迫切的任务。为此前人做了大量的研究工作，提出了很多脱硫的方法，但每种方法都存在技术或经济上的缺陷，如投资过高、副产品难处理、脱硫效率低、经济性差等。因此，开发能取得经济效益的脱硫方法是解决低浓度SO2烟气污染的重要途径。

英文摘要：

A new flue gas desulphurization （FGD） technology was developed to absorb SO2 by using citrate solution as absorbing agent, with hollow fiber membrane and ultrasonic enhancement. Ultrasonic treatment and membrane technology were introduced into the process of FGD. Ultrasonic cavitation and its enhancement of the mass transfer process were discussed. By using the self-designed reactor, the effects of ultrasonic treatment on the stability of citrate solution and hollow fiber membrane for FGD were studied. The results showed that under the condition of frequency 20 kHz, citrate concentration 0. 5 mol · L^-1 and pH 4. 5, the absorption of sulfur dioxide from flue gas in the hollow fiber membrane module could be enhanced by ultrasonic treatment, but the solution could be heated up, which caused inhibition of absorption. In the process of ultrasonic treatment, citrate solution and hollow fiber membrane remained stable.