基于重力过滤法的污泥比阻公式推导和实验研究  

Formula derivation and test study for sludge specific resistance based on drainage method

作　　者：梁梓恒 Liang Ziheng(Guangzhou City Management Technology Research Center,Guangzhou Guangdong 510170,China)

机构地区：[1]广州市城市管理技术研究中心,广东广州510170

出　　处：《环境与发展》2024年第1期66-70,共5页Environment & Development

基　　金：广州市科技计划项目(202206010054)。

摘　　要：经阳离子聚丙烯酰胺(CPAM)调理的污泥能快速释放出污泥的自由水,并可以形成直径为几毫米的絮团。为评价这种絮凝污泥的脱水性能,行业内多采用重力过滤法,但目前尚缺乏科学便捷的评价方式。通过公式推导,得出重力过滤的基本方程和污泥比阻的计算公式。实验数据线性拟合的结果显示,各组数据的拟合度均高于96%,证明了该方程的适用性。通过研究絮凝剂的技术参数和比阻值关系的实验,得出如下结论:适合该污泥样品的CPAM摩尔离子度和分子量范围分别为20%~25%、800万~1000万;CPAM的分子量越高,最佳投量越低,越不利于污泥脱水,在实际上机使用时操作难度越大;效果最佳的两种絮凝剂的最佳投加量为3.16 kg/t,此时比阻值分别为7.05×10^(8) m/kg和6.95×10^(8) m/kg。Sludge after being conditioned by cationic polyacrylamide(CPAM)releases free water quickly and can form flocs with a diameter of several millimeters.In order to evaluate the dewaterability of flocculated sludge,the drainage method is widely used in the industry,but the evaluation way is not scientific and convenient enough.Through formula derivation,the basic equation of drainage method and formula of specific resistance are obtained.The results of linear fitting of test data show that goodness of fit index of all tests are higher than 96%,which proves the applicability of the equation.We can get following conclusions after the tests for studying the relationship between technical parameters of flocculant and the specific resistance:the CPAM ionic degree and molecular weight range suitable for the sludge sample are 20%~25%and 8 million~10 million respectively;The higher the molecular weight of CPAM,the lower the optimal dosage,but the less helpful it is to sludge dewatering,and the more difficult it is to onsite operation;The optimal dosage of the two flocculants with the best effect was 3.16 kg/t,and the specific resistance values were 7.05×10^(8) m/kg and 6.95×10^(8) m/kg respectively.

关 键 词：重力过滤法 比阻 阳离子聚丙烯酰胺 

分 类 号：X131[环境科学与工程—环境科学]