颗粒状污泥的干燥特性及表观变化  

Drying Characteristics and Apparent Change of Sludge Granules During Drying

作　　者：马学文[1] 翁焕新[1] 章金骏[1] 

机构地区：[1]浙江大学环境与生物地球化学研究所,杭州310027

出　　处：《环境科学》2011年第8期2358-2364,共7页Environmental Science

基　　金：浙江省重大科技项目(2005C13005;2005C23051)

摘　　要：对3种不同质量等级的污泥颗粒(2.5、5和10 g)在100、200、300、400和500℃下进行恒温干燥实验,通过观察污泥的失重特征和表观形态的变化,深入研究了污泥干燥过程、失重速率的变化规律.结果表明,污泥在100～200℃下的干燥过程分为加速阶段、恒速阶段和降速阶段,而在300～500℃下并没有真正的恒速阶段,但污泥表面产生的大量裂缝维持了较高的平均失重速率;污泥的平均失重速率与干燥温度呈二次方关系.在100～200℃时污泥的干燥过程不受颗粒大小影响,在300～500℃时同样大小污泥颗粒的干燥过程类似.在100～300℃时,直至焦化的干燥过程中并未发生有机物热分解;在400～500℃时,干燥过程中会伴随着部分有机物分解.Three different weight grades of sludge granules（2.5,5,10 g） were dried at constant temperature of 100,200,300,400 and 500℃,respectively.Then characteristics of weight loss and change of apparent form during sludge drying were analyzed.Results showed that there were three stages during sludge drying at 100-200℃： acceleration phase,constant-rate phase,and falling-rate phase.At 300-500℃,there were no constant-rate phase,but due to lots of cracks generated at sludge surface,average drying rates were still high.There was a quadratic nonlinear relationship between average drying rate and drying temperature.At 100-200℃,drying processes of different weight grade sludge granules were similar.At 300-500℃,drying processes of same weight grade of sludge granules were similar.Little organic matter decomposed till sludge burning at 100-300℃,while some organic matter began to decompose at the beginning of sludge drying at 400-500℃.

关 键 词：污泥 污泥颗粒 污泥干燥 干燥特性 表观变化 

分 类 号：X705[环境科学与工程—环境工程]