两段进水生物膜法OOA-MBR工艺强化生物脱氮

Biological nitrogen removal by two-step feed OOA-MBR process

开发出一种两段进水生物膜法好氧/好氧/缺氧-膜生物反应器(OOA-MBR)强化生物脱氮工艺,以模拟生活污水为研究对象,重点考察了流量分配比、曝气方式和水力负荷等因素对系统运行效果的影响,并对工艺控制参数进行了优化。实验结果表明,在系统HRT 4.8 h,流量分配比为1∶1,后置MBR池曝气方式采取Air-on 4 min/Air-off 6 min模式,进水COD(380±20)mg·L-1、NH+4-N(35±5)mg·L-1、TN(35±5)mg·L-1时,出水COD、NH+4-N和TN去除率分别达到93.9%、91.8%和77.7%,出水水质满足《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准。

A two-step feed aerobic/aerobic/anoxic-membrane bioreactor （OOA-MBR） process was devel- oped to enhance biological nitrogen removal. The effects of the flow distribution ratio, aeration mode, and hy- draulic loading on the nitrogen removal efficiency were investigated with synthetic domestic sewage as research object, and the process control parameters were optimized. The experimental results show that when the system HRT is 4.8 h, the flow distribution ratio is 1 ： 1 ; the aeration mode adopts the Air-on 4 min/Air-off 6 min mode in the MBR tanks; the influent COD concentration is （380 ±20）mg · L-1, NH4-N is （35 ±5）mg · L-1 , TN is （35 ±5 ）mg · L-l, respectively; and the effluent COD, NH4 -N, and TN removal efficiency can reach 93.9% , 91.8% , and 77.7% , respectively. In this manner, the effluent meets the level A discharge standards in China （ GB 18918-2002）.