AF-BAF process in treatment of piggery wastewater | AF-BAF工艺对猪场废水处理的研究

中国人. 针对养猪场废水化学需氧量(COD)和氨氮(NH3-N)含量高的特点，采用厌氧生物滤池(AF)联合曝气生物滤池(BAF)处理工艺，研究其对废水中COD和NH3-N的去除效果，为养殖废水处理提供一种新的工艺。以来自陕西杨凌本香集团某养猪场的废水为研究对象，以COD和NH3-N含量及其去除率为测定指标，在AF、BAF反应器分别成功启动后，确定其最佳运行参数，并在此基础上研究AF-BAF工艺对废水COD和NH3-N的去除效果。AF和BAF反应器分别经89和25 d运行后成功启动。最佳运行工艺条件为：AF水力停留时间(HRT)为18 h；BAF气水比为7，HRT为10 h。猪场废水经AF-BAF工艺处理后，出水COD为190～340 mg/L，NH3-N含量为40～70 mg/L，废水的COD和NH3-N总去除率分别达到94.69%和87.72%。AF-BAF工艺对高浓度养殖废水有良好的处理效果，出水水质满足《畜禽养殖业污染物排放标准》的要求。

英语. The chemical oxygen demand (COD) and ammonia (NH3-N) concentrations in piggery wastewater are high. A treatment process of anaerobic filter (AF) plus biological aerated filter (BAF) was used. The objective was to study the effect of AF-BAF process on wastewater COD and NH3-N content. The results could provide new technology for the treatment of livestock and poultry cultivation wastewater. Wastewater from a pig farm of Benxiang group in Shaanxi Yangling was studied. COD and NH3-N removal rates were selected as determination standard. After starting the AF and BAF reactors, the optimum operational parameters were determined. Next, the AF-BAF system was operated under these optimum conditions to determine the COD and NH3-N removal rates from wastewater. The AF reactor required 89 days for start-up, whereas the BAF reactor required 25 days. The optimum hydraulic retention time (HRT) for the AF was 18 h. For the BAF, the optimum HRT was 10 h and the optimum gas to water ratio was 7. After treatment, the COD of the wastewater ranged from 190 to 340 mg/L and the NH3-N concentration ranged from 40 to 70 mg/L. On average, the treatment process removed 94.69% of the COD and 87.72% of the NH3-N. The AF-BAF process is effective for the treatment of livestock and poultry cultivation wastewater. The water quality indices of the effluent meet the Discharge Standard of Pollutants for Livestock and Poultry Breeding（GB 18596-2001）.