Abstract: An effective flocculant-producing strain named Bacillus subtilis K8 has been isolated from the sea of Bin-zhou Port. It is found that the fermentation of the flocculant of the strain belongs to Type Ⅰ. The highest flocculating activity occurs in 32 h of fermentation. The flocculation rate for kaolin suspending liquid is 86.30%,and the floccu-lation rate of the fermentation supernatant 95.40%. The results of the research show that when the fermented liquid is used for treating the effluent from the secondary sedimentation tank,the flocculation rate reaches 84.61%. The adap-tive capacities of pH and temperature are pretty wide,and have certain sedimentation effect on chlorella liquid,too. The strain shows comparatively big application potential in wastewater treatment engineering,especially in petroch-emical wastewater treatment.

Key words: Bacillus subtilis, microbial flocculant, flocculation, petrochemical wastewater

摘要： 从滨州港海域中分离到一株高效产絮菌株枯草芽孢杆菌K8，其絮凝产物发酵属于Ⅰ型发酵；发酵32 h时絮凝活性最高，对高岭土悬液的絮凝率可达86.30%，发酵上清液絮凝率达95.4%。研究结果表明，采用发酵液处理石化二沉池出水时絮凝率达84.61%，pH与温度适应范围宽，对小球藻液也有一定的絮凝沉降作用。该菌株在水处理工程尤其是石化污水处理中显示出较大的应用潜力。

关键词: 枯草芽孢杆菌, 微生物絮凝剂, 絮凝, 石化污水

CLC Number: 

• TL285

• X703