【摘要】 给水处理过程中颗粒物的粒径与其相对应颗粒数量的分布规律满足幂函数关系,其参数(β和K)可以用于描述悬浮颗粒物的特征。结合试验探讨了参数β和K的意义及其变化规律。结果表明,β值反映了水中不同粒径颗粒物的分布情况,K值则反映了水中颗粒物总体积的变化情况。对S水厂的原水、沉淀出水和过滤出水的试验结果表明,β值的变化显示了水中小粒径颗粒物(2~15μm)所占比例逐渐降低;K值的变化显示了水处理过程中颗粒物的逐步去除,且K值的递减程度说明了各处理单元对水中颗粒物的去除效果;β和K值可以间接体现水处理工艺的运行效果。更多还原

【Abstract】 In drinking water treatment,the use of the power law to describe particle size distributions(PSD) in particle counting practice is common.The power law is popular because it allows two meaningful parameters,slope(β) and intercept (K),to describe and identify size distribution characteristics of suspended particles.The meanings and their variations of the two parameters were studied in a series of full scale experiments.The slope(β) demonstrates the distribution regularity of different sized particles in water,and the intercept(K) shows the volume variation regularity of all particles in water.Results show that the variety of β values represents that the decreasing of small particle(2-15 μm) and the variety of K values represents the removing of particles in the water treatment processes.The findings from this study support the use of the power law model with the parameters β and K consequently to describe the PSD.更多还原