Correlations between floc physical properties and optimum polymer dosage in alum sludge conditioning and dewatering
Correlations between floc physical properties and optimum polymer dosage in alum sludge conditioning and dewatering
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DOI：
10.1016/s1385-8947(02)00253-x
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发表时间：
2003-04
影响因子：
15.1
通讯作者：
Yaqian Zhao
中科院分区：
文献类型：
--
作者：
Yaqian Zhao
本文旨在研究用有机聚合物对明矾污泥进行调理并使用气压板装置进行脱水时，絮凝体的物理性质，如粒径、密度、结构（以分形维数计算）与最佳投加量之间的关系。最初，通过改进的比滤阻力（SRF）来评估最佳剂量。之后，通过图像分析系统更详细地检查了絮团的大小、密度和结构。研究结果表明：(1)明矾污泥经聚合物处理后，絮凝体粒径显著增大，且在高投加量下达到平稳期；(2)剂量越大，絮凝体有效密度越高；(3)分形维数的增加与剂量的增加有关，特别是在小剂量下，这反映了絮凝体结构的致密性增加。在调理和脱水过程中，除絮凝体粒径与最佳投加量有较弱的相关性外，絮凝体的物理性质与最佳投加量均无直接相关关系。
This paper aims to examine the correlations between floc physical properties, such as size, density, structure (in terms of fractal dimension) and optimum dosage in an alum sludge conditioning with organic polymer and also dewatering using an air pressure plate apparatus. Initially, optimum dosage was evaluated by a modified specific resistance to filtration (SRF). Thereafter, floc size, density and structure were examined in greater detail by means of an image analysis system. The results of this investigation reveal that: (1) polymer conditioning of alum sludge can result in a significant increase of floc size with a plateau to be reached in higher dosages; (2) higher floc effective densities are associated with larger doses; and (3) increased fractal dimensions are associated with increased dose, particularly in small dosages, this reflecting the increased compactness of floc structure. However, no direct correlation was found between floc physical properties and optimum dose both in conditioning and dewatering except for the weak correlation in floc size and optimum dosage.