不同调理方案下污泥脱水性能评价指标的相关性研究

Relationship of Evaluation Indexes of Sludge Dewatering Performance Under Different Conditioning Programs

污泥脱水性能评价指标选取不同导致目前调理剂难以进行比选.以聚丙烯酰胺(PAM)、FeCl3及无机复合物等几种常用的调理剂为例,通过测定调理后污泥比阻(SRF)、毛细吸水时间(CST)、污泥沉降性能、泥饼含水率及污泥脱水率5个常用评价指标,探讨了各种指标之间的相关性.结果表明,当分别使用不同种类和不同投加量的调理剂时,SRF与CST具有良好的正线性相关性(R2分别为0.96、0.93).SRF及CST均能准确地反映污泥板框压滤脱水性能,但不能很好地预测离心脱水效果.污泥的沉降性能与SRF、CST大致呈现出相同的变化规律.由于泥饼含水率与脱水率存在一定的相关性,但不存在对应性,因此优选调理剂时,建议综合考虑泥饼含水率和脱水率.

Performances of different sludge conditioners are difficult to evaluate due to the use of various evaluation indexes.Taking several traditional sludge conditioners,e.g.PAM,FeCl3 and inorganic composite conditioners as examples and five evaluation indexes include specific resistance to filtration（SRF）,capillary suction time（CST）,sludge settling performance,water content of sludge cake and dewatering efficiency,were investigated respectively in order to study the correlation among those indexes.The results indicate a significant positive linear correlation between SRF and CST（R2 values are 0.96 and 0.93,respectively） after adding different types of conditioners or different amount of conditioners.While they can precisely reflect plate and frame filter press efficiency,but they fail to predict the effects of centrifugal dewatering.Sludge settling performance presents the similar tendencies with SRF and CST.Since there is only limited correlation rather than strict correspondence between water content of sludge cake and dewatering efficiency.Thus,both factors should be considered synthetically in optimizing dosage performances.