丝状菌污泥膨胀及其致密过程中菌丝体演替规律

Variation of mycelium in processes of filamentous sludge bulking and densification

为了探索丝状菌的致密途径、解决丝状菌污泥膨胀的难题,从丝状菌的自身特点及外部条件出发研究了其在污泥膨胀及致密过程中菌丝体的演替规律。研究发现,致密生长的大絮体对丝状菌的种类是有选择性的,那些丝体较弯曲、丝体强度较大、贮存能力强的菌丝体更利于形成聚集态生长。另外,研究表明,不同种类丝状菌的生长势和存贮能力不同,对底物的利用上亦存在着竞争关系。实验中存在的几个菌种对PHB颗粒的存贮能力由高到低依次为:Nostocoida limicolaⅡ、Type 1851、Type 0701、Type 021N型菌体。

In order to solve the problem of filamentous sludge bulking,the densification process was studied. Variation of mycelium with conditions of sludge bulking and filaments densification was investigated from the perspective of filaments' characteristics and the process condition. It was found that large filamentous bioaggregates are selective for the species of filamentous microorganisms,i. e.,those organism species with curve shapes,strong structures and high substrate storage capacity have advantages in aggregation. Additionally,results show that one type of filamentous microorganism may compete with the others for substrate. Different types of filamentous microorganisms have different growth potential and substrate storage capacity. In terms of storage capacity for PHB granules,tested microorganism species were in the following order: Nostocoida limicola Ⅱ >Type1851 > Type 0701 > Type 021 N.