Abstract: In order to investigate the effect and mechanism of ozone on purification of the aquaculture water in the circulating water system, experiments on the effects of three different ozone dosages on the organic pollutants, ammonia nitrogen and nitrite in the water are carried out, and on this basis, the mechanism of purification is analyzed. The results show that ozone preferentially reacts with organic pollutants, followed by nitrite, and then oxidizes ammonia nitrogen; ozone selectively removes organic pollutants, preferentially reduces UV254 and water color, has no obvious effect on COD and DOC treatment, but can significantly improve the biodegradability of aquaculture water; 15mg/L ozone dosage can achieve more economical and effective purification effect;UV254, nitrite, water color and COD can be reduced by 73.86%, 92.35%, 37.52% and 16.43% respectively. DOC / UV254 can be increased to 448.86 (cm · mg) / L, significantly improving the biodegradability of aquaculture water. The research shows that the ozonation technology plays a good role in the purification treatment of aquaculture water. It is important to select the appropriate ozone dosage for different conditions to improve the efficiency of purification treatment.

Key words: Ozonation, organic pollutants, purification and removal, ozone dosage, recirculating aquaculture

摘要： 为了探讨臭氧对循环水系统养殖水体水质的净化效果及作用机理，开展3种不同臭氧投加量对水体中有机污染物和氨氮、亚硝酸盐等作用影响的试验，并在此基础上对净化机理进行分析。结果显示：臭氧优先与有机污染物发生反应，其次为亚硝酸盐，然后才是氧化氨氮；臭氧对有机物的去除是选择性的，优先降低UV254和水色，对于COD和DOC处理效果不明显，但能显著提高养殖水的可生化性；15 mg/L的臭氧投加量可取得较经济适宜的净化效果，对于UV254、亚硝酸盐、水色、COD分别可降低73.86%、92.35%、37.52%和16.43%，并将DOC /UV254比值升高到448.86 (cm·mg)/L，显著提高养殖水的可生化性。研究表明：臭氧氧化技术在养殖水体净化处理中发挥了良好作用，针对不同情况选择适宜的臭氧投加量对于提高净化处理效率有重要意义。

关键词: 臭氧氧化, 有机物, 净化去除, 臭氧投加量, 循环水养殖