低溶解氧对生物膜特性的影响研究  

Study on Effect of Low Dissolved Oxygen on Biofilm Characteristics

作　　者：王磊[1,2] 李海英[1] 李雪娟[3] 柯凡[1] 潘继征[1] 

机构地区：[1]中国科学院南京地理与湖泊研究所,江苏南京210008 [2]中国科学院研究生院,北京100039 [3]云南大学生命科学学院,云南昆明650091

出　　处：《中国给水排水》2008年第15期15-19,共5页China Water & Wastewater

基　　金：国家高技术研究发展计划(863)项目(2005AA60101004,2006AA06Z325)

摘　　要：通过考察生物膜的生长特性、除污效率、脱氢酶活性以及微生物群落组成,分析了低溶解氧对生物膜特性的影响,验证了在低溶解氧条件下采用生物膜反应器处理低浓度生活污水的可行性。试验发现,在低溶解氧条件下生物膜具有特殊的生长特性与外观结构,对COD、SS的去除率分别达到60%和90%以上;由于液相中的低浓度有机物向生物膜内的扩散通量较小,使其成为生物膜降解活性的主要限制因素;长期在低溶解氧下运行会使生物膜内环境更适合兼性异养菌的生长,而总的细菌含量变化不大,保证了生物膜具有较高的处理效率。这为降低污水处理能耗,拓宽生物膜反应器的应用范围提供了新的思路和理论基础。Four aspects including biofilm growth, pollutants removal efficiency, dehydrogenase activity and microbial community composition were investigated to analyze the effect of low dissolved oxygen （DO） on biofilm characteristics and verify the feasibility of low-concentration domestic sewage treatment by biofilm reactor. Under the low DO conditions, the biofilm has the special growth and structure. The removal rates of COD and SS are above 60% and 90% respectively. The diffusion flux of organic matters from sewage into biofilm is low and becomes a main limitation of biofilm degradation activity. The long time operation at low DO concentration may make the environment in biofilm more suitable for growth of facuhative heterotrophic bacteria, while the total bacteria amount has no significant change, ensuring that the biofilm has high treatment efficiency. The study provides a new thought and theory basis for reducing energy consumption of sewage treatment and widening the application range of biofilm reactor.

关 键 词：生物膜 低溶解氧 脱氢酶活性 异养菌 

分 类 号：X703.1[环境科学与工程—环境工程]