C/N对好氧颗粒污泥处理垃圾渗滤液影响研究

Effect of C/N Ratio on Landfill Leachate Treatment by Aerobic Granular Sludge

研究低曝气量条件下,采用进水C/N(5、7.5、10)对AGS处理垃圾渗滤液效果的影响,以及反应器以A/O模式运行一完整处理周期内各阶段污染物去除情况。在3 L/min的曝气量条件下,PAC-SBR反应器中好氧颗粒污泥(AGS)已经过60 d曝气培养成熟,反应器以A/O模式运行,包括厌氧时间110 min和好氧时间180 min,将预处理过的垃圾渗滤液稀释后作为进水。改变进水C/N对COD和TP的处理效果影响较小,对氨氮的去除影响较大。碳源较为充足的条件下,AGS对COD和氨氮的平均去除率均能达到90%以上,TP去除率达到66%左右。考虑到节约碳源,C/N=7.5较为合适,该条件下,AGS系统运行一完整周期,对COD、氨氮和TP的平均去除率分别为92.98%、91.58%和62.12%。

This study aimed to investigate the effect of different influent C/N ratios(5,7.5,and 10)on the performance of aerobic granular sludge(AGS)in treating waste leachate under a low aeration rate,as well as pollutant removal at various stages of the reactor during one complete treatment cycle in A/O mode.With an aeration rate of 3 L/min,AGS in the PAC-SBR reactor matured after 60 days of aeration and cultivation.The reactor was operated in A/O mode,consisting of an anaerobic phase of 110 minutes followed by an aerobic phase of 180 minutes,with pretreated,diluted waste leachate as influent.Variation in the influent C/N ratio had a minimal impact on the removal of COD and TP,but significantly affected the removal of ammonia nitrogen.Under conditions of abundant carbon sources,AGS achieved average removal rates of over 90%for both COD and ammonia nitrogen,while the TP removal rate was approximately 66%.Considering carbon source conservation,a C/N ratio of 7.5 was optimal,yielding average removal rates of 92.98%for COD,91.58%for ammonia nitrogen,and 62.12%for TP after one complete cycle of the AGS system.