流体机械

2007, No.420(06) 1-4

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絮凝污泥悬浮液流变性质研究
Investigation on Rheological Properties of Flocculated Sludge Suspension

王丽花;徐继润;
WANG Li-hua,XU Ji-run(Dalian University,Dalian 116622,China)

摘要(Abstract):

研究了某污泥悬浮体系经絮凝处理后的流变行为。絮凝剂为800万分子量的非离子型聚丙烯酰胺,流变参数测定仪器为美国Brookfield公司的DVIII+型流变仪。实验结果表明:悬浮体系的表观粘度随着污泥浓度的增加而增大,两者关系符合爱因斯坦多项式;絮凝污泥属于非牛顿流体,具有剪切变稀的特性,剪切应力与剪切速率的关系可用Herschel-Bulk模型描述;随体系固体浓度的增大,屈服应力τ0及稠度系数k增大,流动指数n下降,并且结合絮凝与流变学理论简要分析了实验结果的机理。
The rheological properties of a flocculated sludge suspension was studied.PAM with molecular weight of 800 million is used as flocculants,and the rheological parameters were measured by DVIII+ rheometer made in US Brookfield Co..The experimental results demonstrate that the apparent-viscosity of the flocculated suspensions goes up with the increase of sludge concentration and the experiments can be formulated by Einstein polynomial model.The Flocculated sludge suspension is a type of non-Newton fluid and characterized by shear thinning.The Herschel-Bulk model is applied to describe the rheological curve.As the solid concentration enlarged,the yield stress τ0 and rigidity coefficient k rose and the Non-newton index n decreased.The mechanism of the results mentioned above is analyzed with flocculation and rheology theories.

关键词(KeyWords): 污泥;絮凝;流变性;剪切稀化
sludge;flocculation;rheological properties; shear thinning

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基金项目(Foundation): 辽宁省教育厅A类项目资助课题(05L024)

作者(Author): 王丽花;徐继润;
WANG Li-hua,XU Ji-run(Dalian University,Dalian 116622,China)

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