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Báo cáo nghiên cứu khoa học " Towards Zero Discharge of Wastewater from Floating Raceway Production Ponds (Milestone No. 5) "

Một vấn đề lớn với tăng cường ao nuôi trồng thủy sản hệ thống sản xuất đã được quản lý chất lượng nước và hạn ngạch xuất viện do sự tích tụ các chất dinh dưỡng thải. Điều này càng trầm trọng hơn trong các dự án CARD hiện tại đã chứng minh khả năng sản xuất rất cao trong ao raceways vượt quá 35 tấn / ha kết hợp mulloway và whiting. Trong khi các hoạt động hiện tại quản lý chất lượng nước thông qua trao đổi nước (khoảng 10% mỗi ngày trung bình - MS 4), nó. | Ministry of Agriculture Rural Developme AusAID Australian Government PROGRESS REPORT Intensive in-pond floating raceway production of marine finfish CARD VIE 062 04 MILESTONE REPORT NO.5 Development of a zero-discharged system Report Author Michael Burke Tung Hoang Daniel Willet December 2007 1 AUSTRALIA COMPONENT 2 Towards Zero Discharge of Wastewater from Floating Raceway Production Ponds Milestone No. 5 D.J. Willett1 C. Morrison1 M.J. Burke1 L. Dutney1 and T. Hoang2 Department of Primary Industries and Fisheries Bribie Island Aquaculture Research Centre Bribie Island Queensland Australia. 2Nha Trang University International Centre for Research and Training NHATRANG City Vietnam Correspondence Daniel Willett Bribie Island Aquaculture Research Centre PO Box 2066 Bribie Island Queensland 4507 Australia. daniel.willett@dpi.qld.gov.au EXECUTIVE SUMMARY A major problem with intensified pond-based aquaculture production systems has been managing water quality and discharge quotas due to the accumulation of waste nutrients. This is exacerbated in the current CARD project which demonstrated the very high production capability of in-pond raceways in excess of 35 ton ha of combined mulloway and whiting. While the current operation managed water quality through exchanging water approximately 10 per day on average - see MS No.4 it is recognised that with water conservation issues and environmental nutrient discharge impacts flushing pond water to waste is a less desirable solution. One of the original goals of this project was to investigate strategies that limited water discharge to show that raceway production of fish could be sustainable. This report summarises details of water remediation strategies investigated to progress towards zero water discharge. Waste sumps were installed into the raceways as a proposed means for collecting and concentrating uneaten feed and faeces thereby reducing nutrients entering the ponds. A trial tested the effectiveness of these solids .