养猪场粪污水阶段性循环利用技术工程实例

Case of Periodic Recycling Project for Piggery Wastewater Treatment

采用两相厌氧-生物接触氧化-矿化垃圾人工湿地床系统处理养猪场粪污水,处理水量为20 m^3/d。运行结果表明,在设计条件下,出水水质稳定,最终出水COD为64 mg/L,氨氮为40.3 mg/L,TN为53.1 mg/L,TP为5.5 mg/L,SS为33.3 mg/L,基本达到《畜禽养殖业污染物排放标准》(二次征求意见稿)。气浮出水可直接用于灌溉养殖场内农业种植区,剩余小部分水经矿化垃圾人工湿地处理后排放。

The combination process of two-phase anaerobic reactor, biological contact oxidation re- actor and mineralized refuse-based constructed wetland is adopted to treat piggery wastewater, and the treatment capacity is 20 m3/d. The operation results indicated that the effluent quality is stable under de- sign conditions. The effluent COD, NH＋4 - N,TN,TP and SS is 64 mg/L, 40.3 mg/L, 53.1 mg/L, 5.5 mg/L and 33.3 mg/L, respectively, which could meet the requirement of Discharge Standard of Pollu- tants for Livestock and Poultry Breeding （second consultation draft）. Most of the effluent of air-floatation equipment was used to irrigate agricultural planting area, and the rest effluent was discharged after treat- ment via mineralized refuse-based constructed wetland.