SBBR反应器SND脱氮的影响因素分析及响应曲面优化

Analysis on influencing factors of nitrogen removal via SND and optimization by RSM in SBBR

采用活性炭涂层改性悬浮填料,在连续曝气的条件下,考察了SBBR反应器脱氮性能。结果表明,SBBR反应器表现出良好的同步硝化反硝化(SND)脱氮性能,对NH3-N和TN的去除率分别为80.7%和63.1%。典型周期内反应器同步硝化反硝化率可达82.7%。单因素试验发现,脱氮率随着曝气时间t的增加而增加,随着溶解氧质量浓度ρDO和填料投加量δ增大而先增大后减小。同时,以溶解氧质量浓度、填料投加量和曝气时间为考察因素,脱氮率为评价指标,采用响应曲面法建立了二次多元回归模型。通过模型求解得出最佳工况:溶解氧浓度为2.37mg/L,填料投加量为40.10%,曝气时间为5.17h,此时,脱氮率得到最大值为69.28%。验证试验表明,回归模型的预测值与实测值偏差率为1.57%。

Nitrogen removal performance of SBBR reactor was investigated under the condition of continuous aeration with suspended packing by activated carbon coating modification.The results indicate that SBBR presents a good simultaneous nitrification and denitrification（SND）performance with the removal rates of NH3-N and TN at 80.7% and 63.1% respectively.During a typical cycle,SND rate can reach 72.8%.Single factor experiments show that nitrogen removal rate increases as the increase of aeration time and it increases first and then decreases as the increase of dissolved oxygen concentration and packing dosing quantity.Secondary multivariate regression model is established with using response surface methodology and taking dissolved oxygen concentration,packing dosing quantity and aeration time as inspective factors and nitrogen removal rate as evaluation index.69.28% nitrogen removal rate as the maximum value is obtained under optimal working conditions according to the model calculation as follows：dissolved oxygen concentration of 2.37mg/L,packing dosing quantity of 40.10%,aeration time of 5.17 h.Verification test show that the deviation rate between predicted values and measured values is 1.57%.