同步半硝化-厌氧氨氧化颗粒污泥工艺在低氨氮污水脱氮的应用

Application of Simultaneous Partial Nitritation/Anammox With Granular Sludge to the Treatment of Low Ammonia Concentration Wastewater

摘要: 为了检验同步半硝化-厌氧氨氧化颗粒污泥工艺(simultaneous partial nitritation/Anammox with granularsludge,SPNAGS)对低氨氮污水的生物脱氮效果,开展了长期的小试试验研究.结果显示,在污水氨氮浓度从200mg/L降到20~50 mg/L时,系统中的颗粒污泥发生解体,难以保持颗粒状,且污泥颜色由原来的红棕色变为灰黄色,系统仍然保持很高的氨氮去除率(〉95%),但总氮的去除率却逐渐降低,最后仅有20%左右,约80%的氨氮转化为硝酸盐.因此,本研究进一步证明了该工艺在应用于低氨氮浓度污水生物脱氮时,系统内亚硝酸盐氧化细菌(nitrite-oxidizing bacteria,NOB)的控制既是关键,也是挑战.

Abstract: To evaluate the performance of the simultaneous partial nitritation/Anammox with granular sludge(SPNAGS) process to treat low ammonia concentration wastewater,a lab-scale study was conducted.Results show that when ammonia concentration is 20 ~ 50 mg/L,granular sludge breaks up gradually and the color varies from reddish-brown to grayish yellow,although the ammonia removal rate is always higher than 95% ,the total nitrogen(TN) removal rate is only 20% at the final phase of the experiment.80% ammonia is converted into nitrate.Thus,the out-selection of wastewater nitriteoxidizing bacteria(NOB) control is very important to the SPNAGS process to treat low ammonia concentration wastewater.