Comparison analysis and suggestions on discharge standards of tailwater for mariculture

To strengthen the ecological environment supervision of marine aquaculture, China, the United States, Japan, Canada, Thailand and other international organizations such as European Union have issued discharge standard of tailwater for mariculture. This paper reviews the progress of discharge standard of tailwater for mariculture, outlines the discharge requirements for industry and local mariculture tailwater in China, and compares and analyzes the discharge standards for mariculture tailwater from three aspects, including standard classification, control items, and discharge limits. The foreign standards for the discharge of aquaculture tail water do not involve grading, there are differences in the control items of the domestic and international standards, in which suspended solids are common control items, and the limitations of the secondary standards for each control item in abroad are stricter than those in China. Furthermore, based on the current situation of mariculture tailwater discharge in China, putting forward a series of proposals aimed at promoting green and healthy aquaculture technology, facilitating large-scale, facility-based and equipment-based aquaculture, regulating the discharge of mariculture tail water through the implementation of business systems, promoting the application of technologies such as online monitoring and big data regulation, and conducting research and development activities to advance the field of mariculture tail water treatment technologies, in order to provide certain reference opinions for the management and standard formulation of mariculture tailwater discharge in China.