膜曝气-生物膜反应器生物强化处理阿特拉津废水运行性能  

Operation Performance of a Bioaugmented Membrane-aerated Biofilm Reactor Treating Atrazine Wastewater

作　　者：刘春[1] 于长富[1] 张静[1] 陈晓轩[1] 张磊[1] 杨景亮[1] 

机构地区：[1]河北科技大学环境科学与工程学院,河北省污染防治生物技术实验室,石家庄050018

出　　处：《环境科学》2016年第8期3101-3107,共7页Environmental Science

基　　金：河北省自然科学基金项目(E2015208140)

摘　　要：在疏水SPG(shirasu porous glass)膜表面形成基因工程菌生物膜,构建SPG膜曝气-生物膜反应器(MABR)生物强化处理阿特拉津废水,考察MABR反应器稳定运行过程中污染物去除性能及其影响因素.结果表明,增大SPG膜孔径和曝气压力,能够提高曝气供氧能力,改善COD和阿特拉津生物强化去除效能.1.5μm疏水SPG膜在70 k Pa曝气压力下的最大供氧能力约为22.4 g·(m^2·d)^(-1).曝气压力为70 k Pa、水力停留时间(HRT)为1.5 h时,1.5μm膜MABR反应器COD平均去除率为80.1%,平均去除负荷为1.86 kg·(m^3·d)^(-1);阿特拉津平均去除率为62.5%,平均去除负荷为0.18 kg·(m^3·d)^(-1).进一步缩短HRT、增加进水负荷后,MABR反应器DO浓度显著下降,COD和阿特拉津去除效率大幅降低.DO浓度对阿特拉津去除的影响更为显著.随着MABR反应器的稳定运行,SPG膜表面单一基因工程菌生物膜逐渐演化为复杂微生物群落,但基因工程菌可以较好地存在于生物膜内,从而保持阿特拉津生物强化去除能力.A hydrophobic SPG（ shirasu porous glass） membrane-aerated biofilm reactor（ MABR） with genetically engineered microorganism（ GEM） biofilm formed on the SPG membrane surface was applied to treat atrazine wastewater. The contaminant removal performance and its influencing factors were investigated during the stable operation of this MABR. The results indicated that the oxygen supply capacity could be increased in the SPG membrane aeration when the membrane pore size and the aeration pressure increased,which could improve the performance of COD and atrazine removals. The maximum oxygen supply capacity of hydrophobic SPG membrane with pore size of 1. 5 μm was estimated to be about 22. 4 g·（ m^2·d）-1 at aeration pressure of 70 k Pa. When aeration pressure was 70 k Pa and hydraulic retention time（ HRT） was 1. 5 h,the average COD removal efficiency was 80. 1% and the average organic loading rate removed was 1. 86 kg·（ m^3·d）-1 in the MABR with 1. 5 μm hydrophobic SPG membrane. Under the same operating conditions,the average atrazine removal efficiency was 62. 5% and the average atrazine loading rate removed was 0. 18kg·（ m3·d）-1. The COD and atrazine removal efficiencies decreased significantly at further shortened HRT and increased influent organic loading rate. DO concentration showed more significant influence on atrazine removal. The simplex genetically engineered microorganism biofilm turned into complex microbial community gradually during MABR operation,but the GEM cells could still reside in the biofilm well. Therefore,the efficient atrazine removal by GEM bioaugmentation could be maintained.

关 键 词：基因工程菌 膜曝气-生物膜反应器(MABR) 疏水SPG膜 生物强化 阿特拉津 

分 类 号：X172[环境科学与工程—环境科学] X703.1