Khả năng chuyển hóa đạm của chủng vi khuẩn nitrate hóa chọn lọc sử dụng cho hệ thống lọc tuần hoàn trong nuôi trồng thủy sản
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Abstract
This study was carried out to evaluate the nitrogen conversion of selected nitrifying bacteria from shrimp ponds used for the recirculating system in shrimp culture tanks. The experiment consisted of 4 treatments: Control: no addition of bacteria; Treatment 1: added bacteria AOB TB7.2; Treatment 2: added NOB TV4.2 and Treatment 3: added a mixture of bacteria AOB TB7.2 and NOB TV4.2; each treatment was repeated 3 times. The results showed that the addition of bacteria AOB TB7.2 and NOB TV4.2 to the biofilter of circulatory system reduced the concentration of toxic gases such as ammonia and nitrite in the culture tank, and significantly increased shrimp survival. Moreover, there was no discharged water throughout the culture cycle could minimize the impact on the outside environment. Adding a combination of AOB TB7.2 and NOB TV4.2, the nitrification process took place faster than single supplementation. Nitrification and nitrification rate increased with bacteria addition treatments compared to the control (7 and 14 versus 14 and 35 days, respectively).
Tóm tắt
Đề tài được thực hiện nhằm đánh giá khả năng chuyển hóa đạm của các chủng vi khuẩn nitrate hóa chọn lọc từ ao nuôi tôm sử dụng cho hệ thống lọc tuần hoàn trong nuôi tôm thẻ trên bể. Thí nghiệm gồm 4 nghiệm thức, mỗi nghiệm thức lập lại 3 lần. Đối chứng: không bổ sung vi khuẩn; 2) Nghiệm thức 1: bổ sung vi khuẩn AOB TB7.2; Nghiệm thức 2: bổ sung vi khuẩn NOB TV4.2 và Nghiệm thức 3: bổ sung hỗn hợp vi khuẩn AOB TB7.2 và NOB TV4.2. Kết quả cho thấy việc bổ sung vi khuẩn AOB TB7.2 và vi khuẩn NOB TV4.2 vào bể lọc sinh học trong hệ thống tuần hoàn làm giảm hàm lượng các khí độc ammonia và nitrite trong bể nuôi, tăng tỉ lệ sống, khác biệt có ý nghĩa thống kê đồng thời tái sử dụng được nguồn nước trong suốt chu kỳ nuôi, giảm thiểu tác động đến môi trường bên ngoài. Bổ sung kết hợp AOB TB7.2 và NOB TV4.2 quá trình nitrate hóa diễn ra nhanh hơn so với bổ sung đơn dòng. Quá trình nitrite hóa và nitrate hóa diễn ra sớm hơn ở các nghiệm thức có bổ sung vi khuẩn so với đối chứng (nitrite hóa và nitrate hóa là 7 ngày và 14 ngày; 14 ngày và 35 ngày lần lượt ở nghiệm thức bổ sung vi khuẩn và đối chứng).
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