反硝化滤池脱氮效率主要影响因素及运行控制对策

The Main Influencing Factors and Operation Control Countermeasures of Denitrification Filter

以江苏某城镇污水处理厂上向流反硝化滤池和下向流反硝化深床滤池为对象,研究实际生产中制约反硝化滤池脱氮效率的瓶颈因素及控制策略。运行结果表明,两种池型反硝化滤池挂膜启动时间约13~15d,稳定运行期间对TN均有较好的去除效果。充足的碳源是进行生物脱氮的必要条件,当碳源投加量为0.18 L/m^(3),脱氮效率达到峰值,继续增大碳源投加量会导致出水COD升高。停留时间是限制反硝化滤池极限脱氮的关键因素,停留时间延长意味着占地面积增大,而过短的停留时间则无法保证脱氮效果。溶解氧过高会抑制反硝化滤池脱氮效率,实际运行中应尽可能将反硝化滤池进水DO质量浓度控制在2.0 mg/L以下。

This study focused on the upflow and downflow denitrification of deep bed filters at an urban sewage treatment plant in Jiangsu Province,aiming to identify the bottleneck factors and control strategies that limit denitrification efficiency in actual production.The results showed that the start-up time for both types of denitrification filters was approximately 13 to 15 days,with effective TN removal during stable operation.A sufficient carbon source is essential for biological nitrogen removal,with peak denitrification efficiency achieved at a carbon source dosage of 0.18 L/m³.Increasing the carbon source dosage beyond this point led to elevated COD levels in the effluent.Residence time was identified as a critical factor in nitrogen removal;however,while prolonged residence time increases the required floor area,too short a residence time fails to ensure adequate denitrification.Additionally,high dissolved oxygen levels were found to inhibit denitrification efficiency.In practical operation,it is recommended to maintain the influent dissolved oxygen(DO)concentration below 2.0 mg/L to optimize the performance of the denitrification filter.