Ozonation được xem như là kỹ thuật hữu ích cho xử lý nước thải, tuần hoàn nước và khử trùng vi khuẩn trong nuôi trồng thủy sản để nâng cao chất lượng postlarvae tôm. Tuy nhiên, kỹ thuật này vẫn còn mới và hạn chế tại Việt Nam. | Tạp chí Nghiên cứu Khoa học 2006 25-33 Trường Đại học Cần Thơ ỨNG DỤNG OZONE XỬ LÝ NƯỚC VÀ VI KHUẨN Vibrio spp. TRONG BỂ ƯƠNG ẤU TRÙNG TÔM SÚ Tạ Văn Vhư ơng ABSTRACT Ozonation is considered as useful technique for waste water treatment water recirculation and bacterial disinfection in aquaculture to improve the quality of shrimp postlarvae. However this technique is still new and limited in Vietnam. The purpose of this study is to encourage ozone application in water treatment and hatcheries of black tiger shrimp Penaeus monodon . The experiment used ozonator of 5g h and 60-L tanks at salinity of 30 ppt. Ozone was injected into tanks through a Venturi pump. Three experiments were conducted consisting of 1 to identify time and dissolved concentration of ozone in water changes of water parameters were also recorded 2 to compare the effects of water treatment by using ozone and chlorine and 3 to investigate the bacterial disinfection by ozone application. The results showed that ozone concentration gradually increased in function of time of ozone injection at a rate of ppm minute. Water quality was improved significantly after ozone treatment. Up to of bacteria were killed at ozone concentration of ppm and ferric ions precipitated completely. At ozone concentration of NO2 was nitrified and57 of H2S concentration was reduced. Ozone could replace chlorine to treat water in shrimp hatcheries to disinfect 100 Vibrio bacteria and total bacteria respectively. There is no significant difference in water quality among treatments. Keyword Vibrio Penaeus monodon ozone Title Application of ozone for water treatment and Vibrio spp. disinfection in rearing tanks of shrimp hatcheries TÓM TẮT Ứng dụng ozon trong nuôi trồng thủy sản được xem là giải pháp hữu hiệu cho việc xử lý nước tái xử dụng cũng như diệt khuẩn trên ấu trùng tôm nhằm nâng cao chất lượng tôm giống. Tuy việc ứng dụng ozon ở Việt Nam còn rất mới mẻ và hạn chế. Đề tài được thực hiện
