Để cung cấp giống cho nuôi trồng thủy sản, trại sản xuất giống hiện có năm ngàn sản xuất hàng năm 20 tỷ giống tôm và một số loài khác tỷ (cua, cá, động vật thân mềm, cá chình, giáp xác) cho phát triển - các hệ thống sản xuất. Hầu hết các trại sản xuất giống sử dụng nước mặn để sản xuất và do đó nằm gần bờ biển. Khi áp dụng các lược đồ sản xuất thông thường "bể trồng mở dòng chảy hệ thống "một số lượng rất lớn nước thải có nguồn gốc từ nước trao đổi thải ra môi trường ven. | RESEARCH ON WATER REUSE TECHNOLOGY FROM HATCHERIES FOR FOR SUSTAINABLE DEVELOPMENT AND ENVIRONMENTAL POLLUTION CONTROL Le Van Cat Pham Thi Hong Duc Le Ngoc Loc Institute of Chemistry. Vietnamese Academy for Science and Technology E -mail levancat123@ 1. State of the art and practical requirements To supply seeds for aquaculture about five thousands existing hatcheries produce annually 20 billion shrimp varieties and some billions other species crab fish mollusks eel crustacean for grow - out production systems. Most hatcheries use saline water for production and therefore are situated near the seashore. In applying conventional production schema tank cultivation- open flow system a huge quantity of wastewater originating from water exchange is discharged into the coastal environment. Wastewaters from hatcheries containing uneaten feed faces excreta pathogens antibiotics could damage land receiving water bodies and habitats. Deterioration in water quality habitat destruction loss of biodiversity soil salination disease transmission antibiotic resistant microorganisms in some case cause of algae bloom. 1 4 6 7 9 may also occur. For environmental protection in general and for the sustainable development of aquaculture production specifically the treatment of wastewater or reuse of wastewater is therefore important. In addition wastewater reuse brings economic benefits for hatcheries far from saline water resources and shops trading in fresh marine products due to reduction in the costs of transporting saline water to these hatcheries. Wastewater reuse is common in several countries 13 14 but the production schema has not been widely applied in Vietnam. 2. Pollution characteristics and wastewater treatment technologies Wastewater from hatcheries or in general from aquaculture production is not heavily polluted but the existing contaminants are very toxic to aquatic species even with low concentrations. The mostly important concern is ammonia originating from .
