微气泡曝气对生物膜反应器启动运行性能影响  

Influence of microbubble aeration on start-up and performance of a biofilm reactor

作　　者：刘春[1] 肖太民 张晶[1] 杨亚男[1] 张静[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重点实验室,河北石家庄050018

出　　处：《中国环境科学》2014年第12期3093-3098,共6页China Environmental Science

基　　金：国家自然科学基金项目(51008111);河北省应用基础研究计划重点基础研究项目(11966726D)

摘　　要：比较了微气泡曝气(MB)与传统气泡曝气(CB)流化床生物膜反应器启动运行性能,以及生物膜形成过程与组成特性.结果表明,启动运行中,MB反应器的COD、NH4+-N和TN平均去除率分别达到90.3%、92.7%和43.4%,而CB反应器的COD、NH4+-N和TN平均去除率分别为79.4%、86.3%和29.3%,MB反应器污染物去除性能优于CB反应器.同时,MB反应器的氧利用率高达94.3%,显著高于CB反应器.MB反应器中生物膜形成速率和稳定生物膜生物量均高于CB反应器,并且所形成的生物膜VSS/SS比值较高而EPS含量较低.因此,微气泡曝气能够加速生物膜形成并获得更高的活性生物量,从而提高生物膜反应器的启动运行性能.Two fluidized biofilm reactors with microbubble aeration （MB） and conventional bubble aeration （CB） were operated simultaneously to compare their performances during start-up and stable operation. The biofilm formation and composition in both reactors were also investigated. The results showed the average removal efficiencies of COD, NH4＋-N and TN were 90.3%, 92.7% and 43.4% in MB reactor during start-up and stable operation, respectively. The corresponding removal efficiencies in CB reactor were 79.4%, 86.3%and 29.3%, respectively. MB reactor presented more efficient performance of contaminant removal than CB reactor. In addition, the oxygen utilization efficiency in MB reactor reached 94.3%, which was much higher than that in CB reactor. Faster biofilm formation and larger biofilm biomass were achieved in MB reactor, compared with CB reactor. Moreover, the biofilm formed in MB reactor showed higher VSS/SS ratio and lower EPS content. These results demonstrated that biofilm formation was enhanced by microbubble aeration in MB reactor, which contained more active biomass.

关 键 词：微气泡曝气 生物膜反应器 启动运行 生物膜形成 胞外聚合物(EPS) 

分 类 号：X703[环境科学与工程—环境工程]