污泥热干燥粘壁的影响因素与机理分析  

Analysis on Influencing Factors and Mechanism of Sludge Adhering Behavior during Thermal Drying

作　　者：王伟之[1,2] 徐晖[3] 吴兆晴 秦琦[5] 张书廷[3] 

机构地区：[1]河北理工大学资源与环境学院,河北唐山063009 [2]河北省矿业开发与安全技术实验室,河北唐山063009 [3]天津大学环境科学与工程学院,天津300072 [4]国华国际工程承包公司,北京100006 [5]中国环境科学研究院,北京100012

出　　处：《中国给水排水》2009年第17期1-4,共4页China Water & Wastewater

基　　金：国家自然科学基金资助项目(50378061)

摘　　要：通过试验考察了污泥种类、含水率、干燥方式及热干燥温度等因素对污泥热干燥过程中粘壁量的影响。结果表明,含水率是影响污泥粘壁量大小最重要的因素,初始阶段的粘壁量随着含水率的降低而逐渐增加,当含水率降低到60%左右时粘壁量达到最大值,之后随含水率的降低而减少;相同条件下未消化污泥的粘壁量大于消化污泥的粘壁量;间接加热方式的污泥粘壁量约为直接干化方式的1.5倍;而加热温度不是决定粘壁量的主要因素。对热干燥过程中污泥粘壁机理的解析表明,污泥中含有的大量有机物和水分是影响污泥粘壁的主要内在因素。The influence of sludge type, sludge moisture content, drying method and thermal drying temperature on sludge adhering quantity during thermal drying was investigated through experiment. The results show that sludge moisture content is the most important factor affecting the adhering quantity. In the initial stage, the adhering quantity increases as the moisture content decreases. The adhering quantity reaches maximum when the moisture content is approximately 60%. The adhering quantity then follows a decreasing trend as moisture content decreases. The adhering quantity of undigested sludge is greater than that of digested sludge under the same condition. The adhering quantity of sludge dried indirectly is 1.5 times of that of sludge dried directly. The temperature is not a main factor affecting the adhering quantity. The analysis of sludge adhering mechanism during thermal drying shows that the organic content and water content in sludge are intrinsic factors.

关 键 词：污泥 热干燥 含水率 粘壁 

分 类 号：X703[环境科学与工程—环境工程]