EGSB-MBR组合工艺处理糖蜜发酵废水效能研究

实验采用厌氧膨胀颗粒污泥床(EGSB)反应器与好氧膜生物反应器(MBR)组合工艺对糖蜜发酵废水进行处理.重点考察了组合工艺对发酵废水的处理效能,包括甲烷的产生效率、污染物(COD、NH4+-N和TN)的去除效能.实验结果表明:控温条件下(35±1)℃]、进水COD约为2250mg/L、pH在为6.0左右时,EGSB对发酵废水的COD去除率可达75.6%,甲烷的容积产气速率为0.48m3/(m3·d).MBR在溶解氧(DO)为1~2mg/L左右时,采用曝气-搅拌交替运行方式处理EGSB出水,可以实现同步硝化反硝化,并且在曝气3h-搅拌1h交替运行条件下,NH4+-N、TN去除率分别为85.13%、58.57%,而最终COD去除率达到85%.

Performance of the combined EGSB-MBR reactor treating fermentation wastewater

The fermentation wastewater was treated by a lab-scale process combined with anaerobic expanded granular sludge bed (EGSB) and membrane bioreactors (MBR). The performance of the combined treatment process was studied in this paper, including methane gas production, the pollutants removal efficiency. The results showed that EGSB was effective in removing the organic pollutants of the fermentation wastewater under mesophilic condition (35±1℃) and the pH 6.0. COD removal rate reached 75.6% and the methane volumetric gas production rate was 0.48m3/(m3·d) when the influent COD was around 2250mg/L. The MBR system adopted continuously-fed and aeration-stir alternate operation to treat the fermentation wastewater after being disposed by the EGSB reactor. The simultaneous nitrification-denitrification (SND) was realized under dissolved oxygen (DO) 1~2mg/L. The best performance for TN removal was achieved under the aeration 3h-stirring 1h operating conditions, while the NH4+-N and TN removal efficiency were 85.13% and 58.57% respectively. Finally the COD remove efficiency of the combined treatment process was about 85%.