溶解氧对复合式MBR处理效果的影响

Influence of Dissolved Oxygen on Treatment Effect of Compound MBR

[目的]探讨溶解氧(DO)对复合式MBR处理效果的影响。[方法]在各环境要素一定的情况下,通过控制不同的DO浓度来观察生活污水中的化学COD、TN、TP的去除效果,以此来确定最佳的DO浓度。[结果]COD的去除效率由DO为0.5 mg/L时的68.3%上升至DO为1.5 mg/L时的97.05%,而当DO>1.5 mg/L时,COD的去除效果则随着DO的升高变化不大;TN的去除效率由DO为0.5 mg/L时的34.6%上升至DO为1.5 mg/L时的66.58%,而当DO>1.5 mg/L时,TN的去除效率反而下降;TP的去除效果在DO为0.5 mg/L时是64.63%,随着DO的升高,TP的去除效果略有下降,但当DO>1.5 mg/L时,TP的去除效果明显下降。[结论]综合DO对于各项指标的去除影响可以断定,当DO为1.5 mg/L时,MBR工艺对于COD、TN、TP的综合去除效果可达到最佳。

[Objective] The study aimed to explore the influence of the dissolved oxygen on the treatment effect of compound MBR.[Method] Under the environmental factors were certain,through the control of different DO concn.,the removal efficiency of chemical COD,TN and TP in the domestic sewage was observed to determine the best DO concn.[Result] The COD removal efficiency could be rose from 68.3% for DO at 0.5 mg/L to 97.05% for DO at 1.5 mg/L and when DO was1.5 mg/L,the COD removal efficiency had little change with the rise of DO.The TN removal efficiency could rose from 34.6% for DO at 0.5 mg/L to 66.58% for DO at 1.5 mg/L,and when DO was1.5 mg/L,the TN removal efficiency was dropped on the contrary;the TP removal efficiency was 64.63% when DO was 0.5 mg/L and the TP removal efficiency was declined slightly with the rise of DO,but when DO was1.5 mg/L,the TP removal efficiency was decreased obviously.[Conclusion] Synthesizing the removal effects of DO on each index,it was judged that,when DO was 1.5 mg/L,the comprehensive removing effects of MBR process on COD,TN,TP could reach the best.