丝状真菌Talaromyces flavus S1改善污泥脱水性能及机理研究

Improvement of Sludge Dewatering by Filamentous Fungi Talaromyces flavus S1 And Its Mechanism

从城市剩余污泥中分离出一株丝状真菌Talaromyces flavus S1,将预培养的菌丝体接种到污泥后,能够有效地改善污泥脱水性能。通过分离菌丝体培养液,发现并非真菌分泌物(微生物絮凝剂)而是菌丝体本身改善了污泥脱水性能;菌丝体对高浓度污泥的脱水性能影响显著,最多可提高40.58%,污泥浓度较小时,脱水性能不但没有改善反而变差;与聚丙烯酰胺(PAM)和聚合氯化铝铁(PAFC)相比,菌丝体调理对毛细吸水时间的降低更显著,而添加PAM对污泥比阻效果更好,单独添加PAFC效果最差,在PAM与菌丝体协同调理下,污泥的脱水性能可提高60%左右。通过污泥粒径分布与SEM电镜扫描的结果发现:菌丝体通过缠绕包裹小颗粒的污泥,使污泥絮体和污泥颗粒增大从而改善了污泥脱水性能。菌丝体接种的接种方式比孢子直接接种更加实际有效,利用生物法改善了污泥脱水性能,对以该菌为基础开发生物脱水工艺有重要意义。

A filamentous fungi strain named Talaromyces flavus S1 was isolated from the municipal sludge.The dewaterability of sludge could be improved remarkably when the mycelium was inoculated to sludge.The results show that it is the mycelium itself rather than fungal secretions(Microbial flocculatants)improved the sludge dewaterability by separtating the culture solution of mycelium;The dewaterability of high concentration sludge was improved significantly by adding the fungal mycelium,as well as,it could be increased by 40.58%.When the sludge concentration is low,the dewaterability is even poorer than the raw sludge;The Capillary Suction Time(CST)of the sludge by conditioning of mycelium shows greater reduction compared with the Polyacrylamide(PAM)and polyaluminum ferric chloride(PAFC),but PAM is more effective to the specific resistance of sludge(SRF),while,the role of PAFC is weakest.The sludge dewaterability could be improved by 60%under the synergistic effect of PAM and mycelium.From the results of sludge particulate distribution and Scanning Electron Microscope(SEM),it shows that the dewaterability was advanced by the enlargement of sludge floc and particulate due to the small sludge particulate was wrapped by the mycelium.In a word,a more effective and reliable biological conditioning method is put forward to improve the sludge dewaterability on the basis of using the fungal spores.The results have an important significance to develop a new biological technology on sludge dewatering based on this filamentous fungi.