好氧颗粒污泥形成过程与机理分析

以西安市第三污水处理厂氧化沟中的普通絮状活性污泥为接种污泥,人工配制的模拟生活废水为营养,表面气体上升流速为1.06~1.77 cm/s时,在SBR反应器中成功培养出了好氧颗粒污泥,SVI值由最初的168 mL/g逐渐降低至40 mL/g左右,污泥表现出了良好的沉降性能,同时,对COD、TN、TP的去除率分别达到了95%、96%和98%。研究认为,颗粒污泥的形成是一个微生态系统形成的过程,水力剪切力是其形成的一个重要影响因素,直接影响到好氧颗粒污泥微生物种群的结构和分布;从丝状微生物与微生态群落的关系分析,胶团菌与结构丝状菌之间相互依存,丝状微生物形成了絮体骨架,为絮体形成较大颗粒提供了必要条件。

Formation of Aerobic Granular Sludge and Analysis of Its Mechanism

Experimental study of aerobic granular sludge in sequencing batch reactor(SBR) was performed using a synthetic domestic wastewater and ordinary flocculent activated sludge from the 3rd Sewage Treatment Plant in Xi’an,Shaanxi Province as seeding sludge.Aerobic granular sludge was cultivated successfully when the surface gas flow rate was 1.06~1.77 cm/s.SVI value from the initial 168 mL/g gradually reduced to 40 mL/g,sludge showed good sedimentation performance.Aerobic granular sludge to COD,TN,TP removal rate remained stable at 95%,96% and 98%.Study suggested that the formation of granular sludge is a process of the formation of micro-ecological system,and hydraulic shear stress is a significant impact factor of its formation,which affects the composition of microbial population structure and distribution in aerobic granular sludge.From analysis of the relationship of filamentous microorganisms and microbial community,zoogloea and filamentous bacteria depend on each other.Filamentous microorganisms form the floc skeleton,which provide the necessary condition for floc to form larger floc particles.