回流比对前置反硝化BAF处理效果的影响研究

Study on Impact of Reflux Ratio on Treatment Efficiency of Predenitrification BAF

前置反硝化曝气生物滤池(BAF)工艺融合了BAF工艺与A/O工艺的优点,具有良好的脱氮性能,其中回流比是影响其处理效果的一个重要因素。考察了在回流比分别为100%、200%、300%的条件下该工艺对COD、NH3-N、TN的去除效果。试验结果表明:在回流比从100%提高到300%的过程中,对污染物的去除效果以200%为界呈先上升后下降的趋势,但对去除COD、NH3-N的影响不大,对去除TN的影响显著;在200%的最佳回流比下,对COD、NH3-N和TN的平均去除率分别为89.1%、98.6%和75.5%。

The pre-denitrifieation BAF process integrates the advantages of the BAF and A/O processes and has better performance of nitrogen removal. The reflux ratio is a decisive factor influencing the pollutant removal efficiency. The removal effieieneies of COD, NH3 - N and TN at the reflux ratios of 100%, 200% and 300% were investigated. The results show that the pollutant removal efficiency increases when the reflux ratio ranges from 100% to 200% , but decreases when the reflux ratio ranges from 200% to 300%. However, the TN removal is significantly influenced, while the COD and NH3 - N removal is less influenced. At the optimal reflux ratio of 200%, the average removal rates of COD, NH3 - N and TN are 89.1% , 98.6% and 75.5% , respectively.