基于降维分析的活性污泥絮体结构特征指标

发布时间：2018-03-16 00:23

本文选题：絮体结构特征指标　切入点：PCA线性降维　出处：《中国环境科学》2017年05期 　论文类型：期刊论文

【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.
[Abstract]:In order to establish the characteristic indexes of the structure analysis of activated sludge flocs, 19 microscopic parameters describing the flocs structure were classified into 4 categories: flocs size, compactness, regularity and filamentous bacteria FLL. The microcosmic parameters of these flocs are reduced by using principal component analysis (PCA) and isometric mapping (Isomapa, nonlinear dimensionality reduction), respectively, by means of principal component analysis (PCA) and isometric mapping method (Isomapa, nonlinear dimensionality reduction). By comparing the dimensionality reduction amplitude and dimensionality effectiveness of two dimensionality reduction methods, the characteristic index of floc structure was determined. The reduction range of RG and FL were 0.750 ~ 0.400 ~ 0.625 and 0.500 ~ (-1) Isomap respectively, and the RG and FL of SZCP-RG and FL were characterized by one comprehensive index, respectively. The dimensionality reduction ranges are 0.750 ~ 0.800 ~ 0.875 and 0.500 respectively. From the analysis of dimensionality reduction amplitude and dimensionality reduction effectiveness, it can be seen that the comprehensive index of Isomap can describe the floc structure more accurately and succinctly, and it is more suitable as the characteristic index of activated sludge floc structure.
【作者单位】：安徽工业大学建筑工程学院;生物膜法水质净化及利用技术教育部工程研究中心;安徽工业大学能源与环境学院;
【基金】：安徽省高校科学研究项目(KJ2013A059)
【分类号】：X703

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