曝气协同粉末活性炭调控MBR运行

Membrane Bioreactor Operation Regulation Based on Aeration and Powdered Activated Carbon Coupling

为了解决膜生物反应器(MBR)处理效果不稳定和运行成本高的问题,通过优化曝气和粉末活性炭(PAC)的耦合作用,调控MBR的运行。通过构建6种工况,考察了不同气水比和不同PAC投加量条件下MBR的处理效果、污泥混合液特性和膜污染情况。结果表明,当气水比为65∶1、PAC投加量为1 g/L时,MBR的运行效能最佳,对COD、TN、NH_(4)^(+)-N、TP的平均去除率分别为95.81%、43.22%、85.17%和31.64%,跨膜压差(TMP)增速也较低,约为2.692 kPa/d;当气水比为65∶1、PAC投加量为2 g/L时,对COD、TN、NH_(4)^(+)-N、TP的平均去除率均在前者的基础上分别有2%、26%、8%和42%的提升,TMP增速增加至6.425 kPa/d,此时虽然处理效果更好但运行成本较高,膜过滤周期较短。因此在PAC-MBR的实际应用中,需要先权衡预期处理效果和运行成本再进行MBR运行参数的设置,应用该控制策略可灵活调节PAC-MBR以适应减污降碳的发展趋势。

To address the issues of unstable treatment performance and high operating cost associated with membrane bioreactor(MBR),the coupling effect of aeration and powdered activated carbon(PAC)was optimized to regulate the operation of MBR.The treatment performance,characteristics of sludge mixture and membrane fouling of MBR under various gas to water ratios and PAC dosages were investigated through the construction of 6 working conditions.When the gas to water ratio was 65∶1 and the dosage of PAC was 1 g/L,the operational efficiency of MBR reached its optimum,and the average removal rates of COD,TN,NH_(4)^(+)-N and TP were 95.81%,43.22%,85.17%and 31.64%,respectively.Additionally,the growth rate of TMP was relatively low,approximately 2.692 kPa/d.When the gas to water ratio was 65∶1 and the dosage of PAC was 2 g/L,the average removal rates of COD,TN,NH_(4)^(+)-N and TP were respectively increased by 2%,26%,8%and 42%on the basis of the previous one,and the growth rate of TMP was enhanced to 6.425 kPa/d.At this point,although the treatment performance was superior,the operation cost was higher and the membrane filtration cycle was shorter.Therefore,in the practical application of PAC-MBR,it is essential to balance the expected treatment performance and operation cost prior to setting the operation parameters of MBR.The application of this control strategy enables the flexible adjustment of PAC-MBR to align with the development trend of pollution reduction and carbon reduction.