膜科学与技术

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Application of powder activated carbon integrated Membrane Bio-Reactor (MBR) process in pesticide wastewater

Authors： JI Hongjun, TONG Yujia, LI Jiayao, LI Weixing

Units： 1Nanjing Tech University Membranes Application Research Institute Com. Ltd, 2National Engineering Research Center for Special Separation Membranes, Nanjing 210009, Jiangsu, China

KeyWords： Pesticide wastewater; MBR; granular activated carbon

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(1):115-120

Abstract：

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.

Funds：

天津合成生物技术创新能力提升项目（TSBICIP-KJGG-003）和江苏省教育厅青蓝计划

AuthorIntro：

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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