【摘要】 水产养殖尾水和农田退水是农业面源污染的主要来源之一。本研究基于466 666.7 m²现代农业地块，设计了一套水产养殖尾水和农田退水联合净化工艺，主要包括生态净化沟渠模块、农田净化模块以及景观湿地林模块。其中，生态净化沟渠旨在充分利用小型河道排水系统控制N、P等污染物浓度，包括生态集水预处理沟、悬浮生态床沟、生态输水廊道及调节稳定生态沟。结合水产养殖尾水和农田退水水质特点，设计出水水质目标为化学需氧量（COD）≤40 mg·L^-1、总氮（TN）≤3 mg·L^-1、总磷（TP）≤0.5 mg·L^-1。经一年跟踪监测，出水水质达到设计目标，此外，除TN指标，COD和TP均有8个月能够满足《地表水环境质量标准》（GB 3 838-2002）Ⅲ类水质要求。工程实施后，地块在保留原有生产功能的基础上兼具了水质净化及景观风貌功能。本工艺设计理念及工程实践可为其他农村地区农业面源污染控制，尤其是养殖尾水-农田退水联合净化提供借鉴。更多还原

【Abstract】 Aquaculture wastewater and return water of farmland are two major sources of non-point source pollution in agriculture. In the study, a combined purification process for aquaculture wastewater and return water of farmland was designed based on a 466 666.7 m² modern agricultural site. This process included three types of modules: ecological purification ditch, farmland purification, and landscape wetland forest. Of which,the ecological purification ditch aims to utilize small-scale river drainage systems to control the concentration of pollutants such as nitrogen and phosphorus. It consists of ecological collection and pre-treatment ditches,suspended ecological bed ditches, ecological water conveyance corridors, and regulating and stabilizing ecological ditches. Taking into account the water quality characteristics of aquaculture wastewater and return water of farmland, the effluent water quality were set as follows: chemical oxygen demand（COD） ≤ 40 mg·L^-1,total nitrogen（TN） ≤ 3 mg·L^-1, total phosphorus（TP） ≤ 0.5 mg·L^-1. After one year of tracking and monitoring, the effluent water quality reached the design targets. In addition, except for TN, both COD and TP could meet the Class Ⅲ water quality requirements specified in the Environmental Quality Standards for Surface Water（GB 3838-2002） for eight months. After implementing this engineering project, the agricultural site not only retains its original production function but also incorporates water purification and landscape aesthetics.The design concept and engineering practices of this process can serve as a reference for controlling agricultural non-point source pollution, particularly in the combined purification of aquaculture wastewater and return water of farmland in other rural areas.更多还原