异养菌与自养菌对好氧颗粒污泥稳定性的影响  

Effects of Heterotrophic and Autotrophic Bacteria on the Stability of Aerobic Granular Sludge

作　　者：李志华[1,2] 张婷[1,2] 吴杰[1,2] 王晓昌[1,2] 

机构地区：[1]西安建筑科技大学环境与市政工程学院 [2]西安建筑科技大学西北水资源与环境生态教育部重点实验室,西安710055

出　　处：《土木建筑与环境工程》2010年第5期76-81,共6页Journal of Civil,Architectural & Environment Engineering

基　　金：国家自然科学基金(50708089);高等学校博士学科点专项科研基金资助课题(200807030001);陕西高校省级重点实验室科研项目计划(09JS027);长江学者和创新团队发展计划资助(PCSIRTI;RT0853)

摘　　要：研究了异养菌和自养菌颗粒污泥的特性:与异养菌相比,自养菌颗粒污泥粒径小、密度大、胞外多聚物(EPS)含量高但强度小。通过对粒径、EPS等特性与密度的变化规律分析,研究发现,自养菌颗粒污泥的粒径与密实度呈现出一致性,颗粒趋于稳定;而异养菌颗粒污泥粒径成长同时伴随着密度减小,粒径与密实度呈现不一致性,颗粒容易解体。颗粒强度的分析结果表明:在自养菌系统中EPS与孔隙率能够达到动态平衡是其长期维持稳定的主要原因,而异养菌中粒径与孔隙率无法达到平衡,操作条件无法控制高强度丝状菌的繁殖是其不稳定的主要因素。The characteristics of granules of heterotrophic and autotrophic bacteria were studied. The autotrophic granules were characterized by smaller granule size, higher density, higher concentration of extracellular polymeric substances （EPS） and weaker strength compared with the heterotrophic ones. The diameter and density of autotrophic granules were changed in the same fashion, resulting in stable granules, and the heterotrophic granule, however, grew up with the increase of diameter and the decrease of density. According to the strength analysis, it is proposed that in the autotrophic system, the balance between EPS and porosity is the main reason for the long term stability. However, the balance could not be obtained in the heterotrophic system and that the operational conditions could not control the overgrowth of filamentous bacteria was the reason for the instability.

关 键 词：自养菌 异养菌 自凝聚 胞外聚合物 颗粒强度 污水处理 

分 类 号：X705[环境科学与工程—环境工程]