养猪废水深度处理工艺研究

Study on Advanced Treatment Process of Swine Wastewater

以回用为目的,探讨了养猪废水的深度处理工艺,考察了“三维电化学+ABR厌氧+生物接触氧化+芬顿氧化”组合工艺对养猪废水COD、氨氮、总氮(TN)、总磷(TP)的降解能力,并采用荧光分析方法解析了溶解性有机物的沿程变化。结果显示,30min三维电化学处理对养猪废水COD、氨氮、TN、TP的降解率分别达到50%、27%、25%、85%,但COD、氨氮分别残留1600.0mg/L和404.9mg/L;ABR厌氧单元的COD去除率为58%,氨氮去除效果甚微;生物接触氧化单元的COD、氨氮去除率分别高达80%和97%,但COD、氨氮、TN、TP仍分别残留136.0、10.5、60.0、2.1mg/L。最终,芬顿氧化工艺将COD、氨氮、TN、TP分别降解到32.1、7.2、12.5、0.03mg/L,完全满足《城市污水再生利用城市杂用水水质》(GB/T 18920—2002)的回用标准,出水仅存微弱的荧光峰D。结果表明组合工艺揭示了一条深度处理养猪废水的途径,其中三维电化学的应用有效调理了废水的理化性质,但仍不足以帮助生物处理单元将COD降到100.0mg/L以下,以回用为目的的深度处理仍需要借助芬顿氧化法等工艺。

Aiming at the reuse of swine wastewater,the advanced treatment process of swine wastewater is researched.The degradation capacity of COD,NH4^+-N,total N(TN)and total P(TP)in swine wastewater is investigated by the combined process of“three-dimensional electrochemistry+ABR+biological contact oxidation+Fenton”,and the variation of dissolved organic matter along the process is analyzed by fluorescence analysis.The results show that the degradation rates of COD,NH4^+-N,TN and TP reach 50%,27%,25% and 85% in a 30 minute three-dimensional electrochemistry treatment,but COD and NH4^+-N remain 1600.0mg/L and 404.9mg/L.The COD removal rate of ABR is 58%,but the NH4^+-N removal rate of it is very low.Biological contact oxidation unit COD,NH4^+-N removal rates are 80%and 97%,but COD,NH4^+-N,TN,TP remain 136.0,10.5,60.0mg/L and 2.10mg/L.Finally,COD,NH4^+-N,TN and TP are degraded to 32.1,7.2,12.5mg/L and 0.03mg/L by Fenton process,which fully meet the reuse standard of Urban Wastewater Recycling Urban Miscellaneous Water Quality(GB/T 18920—2002),and only weak fluorescence peak D exists in the effluent.The results indicate that the combined process reveals a way of advanced treatment of swine wastewater.The application of three-dimensional electrochemistry can effectively regulate the physical and chemical properties of wastewater,but it is not enough to help the biological treatment unit to reduce COD below 100mg/L.The advanced treatment for reuse still needs the help of oxidation processes such as Fenton.