膜科学与技术

粉末活性炭集成MBR膜处理农药废水研究

作者：季红军，童裕佳，李佳尧，李卫星

单位： 1南京工大膜应用技术研究所有限公司，2南京工业大学国家特种分离膜工程技术研究中心，江苏南京211816

关键词：农药废水；MBR；粉末活性炭

出版年,卷(期):页码： 2022,42(1):115-120

摘要：

采用粉末活性炭集成膜生物反应器（Membrane Bio-Reactor，MBR）工艺，以经A/O处理后的农药废水作为进水，先进入活性炭沉降池，再进入MBR中试设备，出水进入产水池，分别对农药废水进水和出水的pH值、色度、浊度、电导率、悬浮物（Suspended solids，SS）、化学需氧量（Chemical Oxygen Demand，COD）、氨氮、总磷、颗粒粒径等进行检测。实验结果表明：在废水温度为27 ℃ -36 ℃下，MBR中试设备运行的跨膜压差稳定在-7 kPa，废水中粉末活性炭和污泥浓度达到20300 mg/L；粉末活性炭集成MBR膜工艺，对于农药废水的pH值、电导率影响较小，能显著降低农药废水的色度和浊度，SS截留率达到98.4%，COD降解率均值达到35.2%、氨氮降解率均值达到41.8%、总磷去除率均值达到48.8%。在曝气工况下，粉末活性炭集成MBR工艺对于农药废水的COD降解率优于不曝气工况，活性炭和污泥聚集体的粒径范围为400 nm-700 nm，能被孔径为25nm的MBR膜截留。通过三维计算流体力学（Computational Fluid Dynamics，CFD），对膜丝附近流动区域进行模型，结果显示SV30为40%时，膜面剪切力为0.09 Pa。该粉末活性炭集成MBR工艺，运行稳定，能够有效处理农药废水，提升出水水质，在农药废水深度处理领域具有较高的工业应用价值。

An integrated process with powdered activated carbon (PAC) and membrane bio-reactor (MBR) is applied in treating pesticide waste water after anaerobic/oxic treatment. The pesticide effluent is firstly entered into subsiders and then flowed into MBR pilot device and the permeated water is flowed into production pond. By analysis pH values, chroma, turbidity, conductivity, suspended solids (SS), CODcr, NH3-N, total phosphate and powder size of the effluent and permeated water, results show that the effluent is operated at 27 oC-36 oC with a transmembrane pressure of -7 kPa, the concentration of PAC and sludge could be up to 20,300 mg/L. There is little difference between pH value and conductivity, while a high difference between chroma and turbidity. The SS intercepting rate is 98.4%, the average CODcr degradation is 35.2%, the average NH3-N degradation is 41.8% and the average total phosphate is 48.8%. The CODcr degradation of PAC-MBR process seems better in the working condition of aeration than no aeration. The aggregated powder size of PAC and sludge is between 400 nm to 700 nm, which is much larger than MBR pore size 25 nm. Accordingly, this MBR can dramatically intercept the aggregates of PAC and sludge. Computational fluid dynamics (CFD) makes models for surrounding area of membranes and results show that when sludge volumn (SV30) is 40% and the surface shear stress is 0.09 Pa. This PAC-MBR combined process can stably work, effectively treat pesticide waste water and improve outlet water quality, indicating it has a high level of industrial development in advanced treatment for pesticide waste water.

季红军（1983-），男，江苏泰州人，博士，主要从事膜应用技术研究

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