The massive discharge of pond aquaculture tail water leads to agricultural non-point source pollution and aggravates the eutrophication of surrounding water.Research and development of tailwater discharge tech-nology has become an important development direction of domestic and foreign fishery production.Through the ecological engineering transformation of paddy fields and ditches,a collaborative purification system integrating paddy fields, agricultural ditches and enhanced ditches was constructed.The paddy field was the production , tail water purification, utilization units, and the ditch was the tail water interception, purification and transpor-tation unit.The treatment efficiency of the purification unit on TN,TP, CODMn and TSS in the tailwater of pond aquaculture was studied and evaluated using the comprehensive water quality index method.The varia-tions of TN,TP, CODMn and TSS concentrations along the different unit were analyzed through the monadic linear regression analysis of model coefficients.Results indicated that the average concentrations of TN,TP, CODMn and TSS in outflow were 1.33, 0.19, 6.61 and 12.00 mg/L, and the average removal rates were 86.73％, 89.26％, 85.77％ and 93.68％.After the purification system treatment,the comprehensive water quality of the tailwater of pond aquaculture was significantly improved.The primary pollutant TN was also sig-nificantly improved,and the related water quality reached the first discharge requirements of the requirement for water discharge from freshwater water aquaculture pond (SC/T 9101-2007).The TN,TP, and CODMn con-tent changes along the water flow were consistent with the linear reduction model.These results probably im-plied that the paddy-ditch system can be used to discharge tail water that meets the pond aquaculture standards and can be applied to rural areas where crop farming and pond farming coexist in China.
aquaculture tail watersystem constructionpurification effectin-process reduction model
维普
万方数据
