Abstract：A new type of magnetic carrier was prepared consisting of pumice, magnet and retiform plastic ball. It was used in a bioreactor to test the function on biofilm formation and biological degradation of domestic sewage. The start-up procedures of magnetic carrier bioreactor and nonmagnetic carrier bioreactor were finished within 5 d and 8 d, respectively. The removal efficiencies of COD and NH+ 4-N by the magnetic bioreactor were marked higher than nonmagnetic bioreactor, with 5% and 20% increasing respectively. The domestic sewage degradation capability of the magnetic carrier was then tested. At the conditions of the central magnetic field intensity of carrier was 200 Gs, the concentration of dissolved oxygen (DO) was 2.0~3.5 mg/L and hydrodynamic retention time (HRT) was at 5 h, the concentration of COD, NH4+-N and TN in the effluent from the magnetic bioreactor were about 20 mg/L, 5 mg/L and 15 mg/L, with removal rates of 90%, 90% and 50% respectively. The biomass of biofilm and suspended sludge quantity in the magnetic bioreactor were about 70% of those in the nonmagnetic bioreactor, after 60d treatment, which indicated that the magnetic field could improve the efficiency of sludge reduction. Moreover, both the specific oxygen uptake rates(SOUR)of the attached sludge and the biofilm on the magnetic carrier were higher than those on the nonmagnetic carrier, which mean that the magnetic field could stimulate the microbe activity.
潘涌璋, 张志永, 师波. 磁性载体生物膜反应器处理生活污水的试验研究[J]. 中国环境科学, 2011, 31(5): 734-739.
PAN Yong-Zhang, ZHANG Zhi-Yong, SHI Bo. Domestic sewage treatment using a magnetic carrier bioreactor. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(5): 734-739.
