短程硝化反硝化工艺处理养猪场废水的厌氧消化液

Short-cut Nitrification and Denitrification Process for Anaerobically Digested Piggery Wastewater Treatment

许多规模化养猪场的厌氧消化液直接外排,造成了严重的二次污染。难降解有机物含量高且碳氮比失调是造成养猪场废水厌氧消化液难于处理的主要原因。采用水解/生物接触氧化(O1)/厌氧生物膜/生物接触氧化(O2)组合工艺处理养猪场废水的厌氧消化液,在常温、不添加任何药剂的条件下,实现了稳定的短程硝化反硝化;在水力负荷约为0.45 m3/(m2.d)的条件下,其对COD和氨氮的总去除率分别为(78%～85%)、(79%～87%),亚硝化率>99%,为高氨氮、低碳氮比废水的生物处理提供了一条有效途径。

The direct discharge of anaerobically digested piggery wastewater from many large-scale pig farms causes a serious secondary pollution. The anaerobically digested piggery wastewater is difficult to be treated due to high content of refractory organic pollutants and carbon/nitrogen ratio imbalance. The combined process of hydrolysis, biological contact oxidization （ O1 ）, anaerobic biofilm and biological contact oxidization （O2） was applied to treat anaerobically digested piggery wastewater. At normal temperature and without addition of any chemicals, a stable short-cut nitrification and denitrification is achieved. When the hydraulic load is about 0.45 m^3/（ m^2 . d）, the removal rates of COD and ammonia nitrogen are 78% to 85% and 79% to 87% respectively, and the nitrosation rate is more than 99%. The combined process provides an effective way for biological treatment of wastewater with high ammonia nitrogen eoncentration and low carbon/nitrogen ratio.