SBR处理渗滤液深度脱氮的影响因素研究

为了解决垃圾渗滤液的脱氮难题，通过改变SBR的操作模式对渗滤液进行处理.同时，试验重点考察了操作模式、曝气时溶解氧、过曝气以及渗滤液碳氮比对工艺脱氮效果的影响.研究结果表明，采用改进SBR对渗滤液进行处理，在原水COD浓度为4000mg/L左右，氨氮浓度为1000mg/L左右，总氮浓度在1100mg/L左右的条件下，不添加任何碳源，出水COD小于500mg/L，氨氮浓度小于5mg/L，总氮浓度小于40mg/L，COD、氨氮和总氮的去除率分别达到了85%、99%和95%以上.影响因素试验表明，反硝化菌中的PHA含量是影响系统脱氮效率的关键.曝气时较高的溶解氧、曝气前的厌氧搅拌以及尽量减少过曝气将提高系统的脱氮效率.同时，只要渗滤液碳氮比大于4，系统均可以对渗滤液实现深度脱氮.

The influential factors of landfill leachate advanced nitrogen removal by SBR

Since denitrification of landfill leachate was a challenging problem, this study modified SBR to improve the efficiency of nitrogen removal. The effects of several operation parameters were investigated, including operation mode, dissolved oxygen, over aeration, and carbon nitrogen ratio of the leachate. The results demonstrated that the modified SBR could reduce the COD, ammonia-nitrogen, and TKN of the leachate from about 4000 mg/L, 1000 mg/L, and 1100 mg/L to less than 500 mg/L, 5 mg/L and 40 mg/L, respectively, without extra carbon source, meaning that the removal rates could reach up to 85%, 99%, and 95%, respectively. Besides, it was found that the PHA content in denitrifying bacteria was the key factor affecting the denitrification efficiency. Nitrogen removal efficiency would be improved by high dissolved oxygen, anaerobic mixing before aeration and less over aeration. Additionally, the advanced denitrification would be achieved if the leachate carbon nitrogen ratio was more than four.