市政污泥脱水性能实验研究与形态学分析

本研究将运用微波技术与离心脱水相结合的方法来达到促进污泥中结合水释放及改善脱水特性的目的.通过测定毛细吸水时间、黏度、含水率,采集污泥图像、提取形态学特征进行污泥脱水改性的效果分析及分形维数的分析.离心脱水实验结果表明,适当增加离心转速和温度时,污泥的含水率降低;正交实验结果表明微波功率1000W、微波温度50℃、离心转速2000r/min、离心时间15min的条件下含水率最低达到83.75%,且适当的微波预处理条件有利于污泥的脱水;微波预处理后污泥分形维数在2.4~2.8之间,污泥结构改变.对污泥脱水性能的表征参数与污泥含水率进行拟合,建立污泥脱水性能的模型,为预测和改善污泥脱水性能提供基础性研究.

Dewatering capability and morphological of municipal sludge

The microwave and centrifuge technologies were combined to release bound water and improve dewatering capability, which was carried out by measuring the Capillary Suction Time (CST), rheological parameters and water content, collecting sludge images to extract morphological features and analyze fractal dimension. The experimental results indicated that water content decreased with an appropriate increase of centrifugal speed and temperature. When microwave power was 1000 W, microwave temperature was 50℃, centrifugal speed was 2000 r/min and centrifugal time was 15 min, the water content of sludge reached the lowest value of 83.75%. The fractal dimension of sludge was in the range of 2.4-2.8 after the pretreatment of microwave. A model of dewatering characteristics was established by fitting dewatering capability parameters and water content, which would contribute to predicting and improving dewatering capability of sludge.