【摘要】 为明确生活污水颗粒物粒径分布及沉降性能，采用颗粒分析仪测试了三个典型生活污水处理厂进水颗粒物粒径分布，通过静沉试验比较颗粒物分布变化及沉降性能，分析了沉砂作用对颗粒物的去除效果，获得了典型生活污水颗粒物分布的基本特性和静水沉降的一般规律。结果表明：进水颗粒物中位径为8～14μm,静沉后的中位径降至4～8μm,颗粒物总数未见降低，但粒径普遍减小；沉砂后水样的中位径为9～15μm,静沉后的中位径降至4～12μm;根据沉砂前后的水样粒径分布，沉砂作用对小于50μm的颗粒物无显著去除效果。更多还原

【Abstract】 In order to study the particle size distribution and sedimentation performance of domestic sewage, a particle analyzer was used to measure the particle size distribution of influent of three typical domestic sewage treatment plants. The change of particle size distribution and sedimentation performance were compared by sedimentation experiment. The effect of grit setting on particles removal was analyzed. The basic characteristics of particle size distribution and the general rules of sedimentation in typical domestic sewage were obtained. The results show that the median diameter of particles in the influent is 8～14 μm, but decreases to 4～8 μm after sedimentation. The total number of particles does not decrease, but the particle size decreases. The median diameter of particles after grit setting is 9～15 μm, but decreases to 4～12 μm after sedimentation. According to the particle size distribution before and after grit setting, grit setting has no significant removal effect on particles with particle size less than 50 μm.更多还原