SBR法短程硝化反硝化处理生活垃圾机械脱除水

Treatment of Garbage Mechanical Dewatering Wastewater by Shortcut Nitrification and Denitrification in SBR

生活垃圾机械脱除水是通过高压挤压等方式从新鲜生活垃圾中快速分离出的混合液,其经厌氧处理后的出水具有高氨氮、低C/N值等特征,为此,利用序批式反应器(SBR)通过短程硝化反硝化途径对其氨氮进行去除,利用高氨氮浓度下的高游离氨(FA)条件对亚硝酸盐氧化菌(NOB)的活性进行抑制,实现SBR中短程硝化与亚硝态氮的稳定积累。研究结果表明,在室温条件下,控制p H值为7.5~8.0、DO<1 mg/L,逐步提高氨氮浓度至700 mg/L,可实现系统中亚硝态氮的有效积累,氨氮去除率和亚硝态氮积累率分别为92.2%、90.9%左右。将短程硝化出水进一步进行反硝化处理,TN去除率高达98.8%。

Garbage mechanical dewatering wastewater is separated from fresh garbage through pressure extrusion, which is characterized by high ammonia nitrogen and low C/N after anaerobic treatment. In this study, the ammonia nitrogen was treated by shortcut nitrification and denitrification method in a sequencing batchreactor （SBR）. Under conditions of high free ammonia （FA） created by high ammonia nitrogen concentration, activity of nitrite oxidizing bacteria （NOB） was inhibited, which achieved partial nitrification and stable nitrite accumulation in the SBR. The results suggested that stable accumulation of nitrite could be achieved at room temperature, reaction pH of 7.5 - 8. 0, DO less than 1 mg/L and ammonia nitrogen concentration gradually increasing to 700 mg/L, where ammonia nitrogen removal rate and nitrite accumulation rate were about 92.2% and 90.9% respectively. Effluent of the partial nitrification was further treated by denitrification, and total nitrogen removal rate was as high as 98.8%.