发酵液絮凝过程絮凝体微尺度与分离性能  

Microscale of flocs and separation characteristics in flocculation process of fermentation broth

作　　者：董明[1] 高浩其[1] 王家荣[1] 邵琼芳[1] 杨泽慧[1] 周国权[1] 

机构地区：[1]宁波工程学院化工学院,浙江宁波315016

出　　处：《化工学报》2009年第5期1219-1223,共5页CIESC Journal

基　　金：国家自然科学基金项目(20676063)~~

摘　　要：In order to understand the flocculation and separation processes of fermentation broth and improve the separation efficiency,this paper,at a microscale,examined the influence of shearing force and size of flocs in the flocculation process of fermentation broth on the effect of removing the flocs by filtration.With micronomicin fermentation broth as the research target,the research changed the shearing force on the flocs in the flocculation process.The size and size distribution of the flocs under different shearing forces were measured within 0.02—2000 μm with a laser particle size analyzer.The filtering rate and settling rate of the flocs were determined.The experiment results showed that the size of the flocs decreased with increasing shearing force and the size distribution span of the flocs increased with increasing shearing force.The settling rate of the flocs increased with increasing size of the flocs; under a moderate shearing force,the flocs had a moderate size and size distribution span and a bigger compaction degree,and the filtering rate of the flocs reached a maximum value.The experiment results indicated that the shearing force in the flocculation process evidently affected the size,size distribution span and compaction degree of the flocs and affected the filtering rate and settling rate of the flocs.In order to understand the flocculation and separation processes of fermentation broth and improve the separation efficiency, this paper, at a microscale, examined the influence of shearing force and size of floes in the flocculation process of fermentation broth on the effect of removing the floes by filtration. With micronomicin fermentation broth as the research target, the research changed the shearing force on the floes in the flocculation process. The size and size distribution of the floes under different shearing forces were measured within 0.02 2000 /~m with a laser particle size analyzer. The filtering rate and settling rate of the floes were determined. The experiment results showed that the size of the floes decreased with increasing shearing force and the size distribution span of the floes increased with increasing shearing force. The settling rate of the floes increased with increasing size of the flocs; under a moderate shearing force, the floes had a moderate size and size distribution span and a bigger compaction degree, and the filtering rate of the floes reached a maximum value. The experiment results indicated that the shearing force in the flocculation process evidently affected the size, size distribution span and compaction degree of the floes and affected the filtering rate and settling rate of the floes.

关 键 词：絮凝体微尺度 分离 絮凝 过滤 发酵液 小诺霉素 

分 类 号：TQ460.6[化学工程—制药化工]