猪场废水常温短程硝化特性

Shortcut nitrification characteristics for swine wastewater treatment at normal temperature

为实现短程脱氮处理高氨氮猪场废水,在非限制溶解氧条件下,采用序列式活性污泥法(SBR)工艺处理某猪场废水,考察了温度、氨氮质量浓度及曝气时间等因素对短程硝化特性的影响。试验结果表明,SBR工艺能够有效去除猪场废水中的氨氮,处理效果稳定,且全部试验过程均有短程硝化现象发生,短程硝化的实现为低化学需氧量(COD)、高质量浓度尿素废水处理工艺的优化奠定基础。当进水氨氮质量浓度在250mg/L以下时,氨氮质量浓度和反应温度(即使其在15℃时)对氨氮去除效果和亚硝酸盐积累率影响不大,二者均在80%左右,长时间曝气并未对短程硝化造成影响;高质量浓度氨氮废水生物处理过程中,亚硝酸盐积累是游离氨(FA)和游离亚硝酸(FNA)共同抑制作用的结果。

In order to evaluate the effect of temperature,ammonia concentration and aeration time on nitrification characteristics of swine wastewater,Sequencing Batch Reactor Activated Sludge Process（SBR） was adopted to treat the swine wastewater with high ammonia nitrogen concentration in the non-limiting dissolved oxygen conditions. The results demonstrated that SBR technology could effectively remove ammonia nitrogen in swine wastewater,shortcut nitrification occurred during the whole experimental process. When the ammonia nitrogen concentration in the influence was less than 250 mg/L,the ammonia concentration and temperature（even when the temperature was at 15℃） had little effect on ammonia nitrogen removal and nitrite accumulation rate（both were about 80%） . Prolonged aeration did not affect shortcut nitrification;nitrite accumulation resulted from co-inhibition of free ammonia（FA） and free nitrite（FNA） during biological treatment for high concentration of ammonia-nitrogen wastewater.