膜曝气膜生物反应器耦合系统处理化工废水

Treatment of Chemical Wastewater by Coupled Membrane-Aerated Biofilm Reactor(MABR) System

高浓度有机化工废水,含有多种复杂有机物,毒性高,难以直接生化。为了提高废水的生化性及处理效果,新型膜曝气膜生物反应器(MABR)耦合高级氧化技术对废水进行了实验研究。以铁-碳微电解、芬顿反应作为预处理,膜曝气膜生物反应器为生化系统,臭氧化技术作为深度处理,探究了操作条件对出水COD浓度、BOD5/COD(B/C)的影响。研究结果表明:在铁碳反应时间为1.5 h,pH值为4时,B/C比可从0.05提高到0.12;而芬顿反应的最适宜n(H_2O_2)∶n(Fe2+)和pH值分别为9和3。经预处理的废水在MABR和深度处理臭氧化的共同作用下,出水COD<500 mg/L,达到了进入污水处理厂的要求。

The treatment of high-concentration chemical organic wastewater by a coupled membrane-aerated biofilm reactor（MABR） system, including ferric-carbon micro-electrolysis and Fenton reaction ap- plied as biological polishing steps, membrane-aerated biofilm reactor（MABR） process and ozonization as post-treatment was studied experimentally. The influence of operational conditions on COD reduction and BODJCOD （B/C） ratio was explored. The results showed that an increase of B/C ratio from 0.05 to 0. 12 was achieved when micro-electrolysis was employed at pH of 4 for 1.5 h. The optimized conditions of Fenton reaction were n（ H2O2）： n（Fe^2＋ ） of 9 and pH of 3. Finally, coupling MABR system with ozo- nization, COD concentration of the effluent quality stayed below 500 mg/L and reached the standard of introduction to municipal sewage treatment plants.