Ye Qi-hong, Wei Zai-shan, Xiao Pan, Li Hua-qin, Zhang Zai-li, Fan Qin-juan
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Huan Jing Ke Xue. 2012 Aug;33(8):2558-62.
The performance of a membrane bioreactor for treatment of toluene as a model pollutant is presented. Effects of toluene inlet concentration, residence time, spray density and pH of liquid phase on the toluene removal rate were evaluated. The experimental results showed that the toluene removal efficiency reached 99%. The optimal pH, residence time and spray density were 7.2, 6.4 s and 2.5 m3 x (m2 x h)(-1), respectively. The gas-phase biodegradation intermediate products were acetaldehyde acid (C2H2O3) and vinyl formic acid (C3H4O2), which were identified by means of gas chromatography/mass spectrometry (GC/MS). The mechanism of toluene degradation using a membrane bioreactor can be described as the combination of mass transfer from hollow fiber membrane to biofilm and biological degradation. Toluene (C6H5CH3) and oxygen diffused from the gas phase to the wet layer of the biofilm and were then consumed by the microbial communities. Toluene was oxidized to the intermediate organic products such as acetaldehyde acid (C2H2O3) and vinyl formic acid (C3H4O2), and the intermediate products were then converted to CO2 and H2O through continuous biological oxidation reactions.
介绍了膜生物反应器对作为模型污染物的甲苯的处理性能。评估了甲苯入口浓度、停留时间、喷淋密度和液相pH值对甲苯去除率的影响。实验结果表明，甲苯去除效率达到99%。最佳pH值、停留时间和喷淋密度分别为7.2、6.4 s和2.5 m³·(m²·h)⁻¹。通过气相色谱/质谱联用仪（GC/MS）鉴定出气相生物降解中间产物为乙醛酸（C₂H₂O₃）和丙烯酸（C₃H₄O₂）。膜生物反应器降解甲苯的机理可描述为从中空纤维膜到生物膜的传质与生物降解的结合。甲苯（C₆H₅CH₃）和氧气从气相扩散到生物膜的湿润层，然后被微生物群落消耗。甲苯被氧化为乙醛酸（C₂H₂O₃）和丙烯酸（C₃H₄O₂）等中间有机产物，这些中间产物通过连续的生物氧化反应进一步转化为CO₂和H₂O。
