Wang Cai-Xia, Zhang Wei-Jun, Wang Dong-Sheng, Wang Qing-Fei, Yu De-Zhong
School of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050024, China.
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China.
Huan Jing Ke Xue. 2016 Jun 8;37(6):2243-2251. doi: 10.13227/j.hjkx.2016.06.030.
The effect of the different forms of titanium salt coagulant conditioning on sludge dewatering performance was studied. The result showed that the sludge dewaterability was the best and the specific resistance to filtration (SRF), the compressibility and the content of organic content in EPS were the lowest when =0.5 compared with others. The optimal dosage of polymeric titanium chloride (PTC) was 0.005 g·g, which was far less than those of the traditional iron salts and aluminum coagulants. When the dosage of PTC with different values was 0.005 g·g, the order of dewaterability was:PTC > PTC> TiCl> PTC. In addition, the variations of characteristics such as particle size () and fractal dimension() of sludge during conditioning were analyzed. The effect of titanium salt coagulant conditioning on the distribution and composition of the sludge extracellular polymeric substance(EPS) was characterized by Three-dimensional Excitation Emission Matrix Fluorescence (3DEEM) and High Performance Size Exclusion Chromatography(HPSEC).The decrease of fluorescent intensity and molecular weight of peak distribution and intensity of organics in EPS was highly correlated to the improvement of the dewatering performance and change of sludge properties.
研究了不同形态钛盐混凝剂调理对污泥脱水性能的影响。结果表明，与其他情况相比，当 =0.5时污泥脱水性能最佳，过滤比阻（SRF）、压缩性和EPS中有机物含量最低。聚合氯化钛（PTC）的最佳投加量为0.005 g·g，远低于传统铁盐和铝盐混凝剂。当不同 值的PTC投加量为0.005 g·g时，脱水性能顺序为：PTC > PTC> TiCl> PTC。此外，分析了调理过程中污泥粒径（）和分形维数（）等特性的变化。采用三维激发发射矩阵荧光光谱（3DEEM）和高效体积排阻色谱（HPSEC）对钛盐混凝剂调理对污泥胞外聚合物（EPS）分布和组成的影响进行了表征。EPS中有机物峰值分布的荧光强度和分子量的降低以及强度与脱水性能的改善和污泥性质的变化高度相关。
