基于降维分析的活性污泥絮体结构特征指标  

Characteristic indexes of floc structure in activated sludge based on dimensionality reduction methods

作　　者：胡小兵[1,2] 朱荣芳[1] 叶星[3] 谢瑞桃 唐素兰[1] 戴波[3] HU Xiao-bing;ZHU Rong-fang;YE Xing;XIE Rui-tao;TANG Su-lan;DAI Bo(College of Architectural Engineering, Anhui University of Technology, Ma’anshan 243032, China;Engineering Research Center of Water Purification and Utilization Technology based on Biofilm Process, Ministry of Education, Ma’anshan 243032, China;College of Energy and Environment, Anhui University of Technology, Ma’anshan 243000, China)

机构地区：[1]安徽工业大学建筑工程学院,安徽马鞍山243032 [2]生物膜法水质净化及利用技术教育部工程研究中心,安徽马鞍山243032 [3]安徽工业大学能源与环境学院,安徽马鞍山243000

出　　处：《中国环境科学》2017年第5期1759-1768,共10页China Environmental Science

基　　金：安徽省高校科学研究项目(KJ2013A059)

摘　　要：为建立活性污泥絮体结构分析的特征指标,将现有描述絮体结构的19个微观参数分为4类:絮体大小(SZ)、密实度(CP)、规则度(RG)和丝状菌(FL)特征,分别含4、5、8、2个.分别采用主成分分析法(PCA,线性降维)和等距映射法(Isomap,非线性降维)对这些絮体结构特征微观参数进行降维分析,通过对两种降维法的降维幅度和降维有效性的比较,确定絮体结构特征指标.结果表明:PCA降维后絮体SZ、FL各由1个综合指标表征,而CP、RG各由3个综合指标表征,SZ、CP、RG和FL的降维幅度分别为0.750、0.400、0.625和0.500;Isomap降维后絮体SZ、CP、RG和FL均由1个综合指标表征,降维幅度分别为0.750、0.800、0.875和0.500.从降维幅度和降维有效性分析可知,Isomap降维后的综合指标更能准确、简洁地描述絮体结构特征,更适合作为活性污泥絮体结构的特征指标.In order to establish characteristic indexes of floc structure in activated sludge,19microscopic parameters used for description of floc structure were divided into four groups:floc size(SZ),compactness(CP),regulation(RG)and filamentous microbes(FL).These four groups included4,5,8,2indexes,respectively.Principal component analysis method(PCA,linear dimension reduction)and Isometric mapping method(Isomap,nonlinear dimension reduction)were used to reduce dimensions of these parameters of floc structure.By comparing decrease range and effectiveness of dimension reduction with two methods above,the characteristics indexes of floc structure were established.After treatment of dimension reduction with PCA,the group index of SZ,FL of floc structure can be characterized by1comprehensive index,so can the group index FL,but for the group index CP,RG,each of them need3comprehensive indexes to represent their characteristics.The decrease range of dimension reduction of SZ,CP,RG,FL are0.750,0.400,0.625and0.500,respectively.The dimensionality of floc structure reduced by Isomap method can be characterized by1comprehensive index for each group,the decrease range of dimension reduction of SZ,CP,RG,FL are0.750,0.800,0.875and0.500,respectively.Therefore,the comprehensive indexes with Isomap dimension reduction are more accurate,concise to describe floc structure characteristics than those with PCA dimension reduction and more suitable for being characteristics indexes of floc structure in activated sludge.

关 键 词：絮体结构特征指标 PCA线性降维 Isomap非线性降维 活性污泥 

分 类 号：X703[环境科学与工程—环境工程]