曝气生物滤池工艺处理港区污水中脱氮关键控制因素研究

Study of Critical Control Factors in Harbour District Wastewater Treatment by BAF Process

[目的]探讨曝气生物滤池在处理港区污水中反应器的最佳工况参数.[方法]以某城市港区污水为处理对象,通过改变反应器的工艺参数,包括进水COD浓度、水力停留时间（HRT）和溶解氧（DO）等,考察各因素对反应器脱氮效果的影响,并综合考虑经济性原则,寻求最优化的工艺参数.[结果]进水COD浓度为190～220 mg/L时,有利于反硝化作用和TN的去除.HRT的延长有助于系统内硝化菌群的代谢,当HRT为6h时,NH4＋-N、TN去除率可维持较高水平.DO浓度宜保持在2.5～3.5 mg/L,可保证出水稳定的前提下尽量降低DO值,以使反应器能耗降低.[结论]该研究为港区污水的处理提供了一种新方法.

[ Objective] The study aimed to discuss the oPtimal process parameters of biological aerated filters （BAF） reactor during the process of harbour district wastewater treatment. [ Method ] With harbor district wastewater from a city as the study object, effects of process parameters like COD concentration,hydraulic retention time （I-IRT） and dissolved oxygen （DO） on denitrification efficiency were analyzed. Moreover, the optimal process parameters were discussed based on the principle of economy. [ Result ] The optimal COD concentration was 190 -220 mg/L, which was conductive to denitrification and TN removal. Extending HRT could promote the metabolism of nitrifying bacteria,and the removal rates of NH4 ＋ -N and TN were high when HRT was 6 h. The optimal DO concentration was 2.5 -3.5 mg/L,and based on the premise that the effluent was stable,DO concentration should be minimized to decrease energy consumption of the reactor. [ Conclusion] The research could provide a new method for the treatment of harbeur district wastewater