不同形状污泥干燥特性的差异性及其成因分析_马学文.pdf

中国环境科学 2011,31(5)：803~809 China Environmental Science 不同形状污泥干燥特性的差异性及其成因分析 马学文,翁焕新*,章金骏 (浙江大学环境与生物地球化学研究所,浙江 杭州 310027) 摘要：通过对 100~300℃恒速干燥条件下饼状污泥和球状污泥的失重速率、干基质量变化的测定,系统分析了不同形状污泥干燥特性的差 异及造成这种差异的原因.结果表明,饼状污泥在干燥过程中会产生裂缝,并分裂成若干小块,而球状污泥仅仅会产生体积收缩,形状并未发 生变化.由于表观形态变化的差异,导致了污泥干燥过程的差异,饼状污泥的干燥过程分为升速和降速 2 个阶段,而球状污泥的干燥过程则分 为升速、恒速和降速 3 个阶段;饼状污泥的平均干燥速率大于球状污泥.在 150℃以上干燥时,饼状污泥的有机物在水分蒸发的同时即开始 分解,而球状污泥则在水分蒸发完后才开始发生有机物分解. 关键词：污泥；饼状污泥；球状污泥；干燥特性 中图分类号：X705 文献标识码：A 文章编号：1000-6923(2011)05-0803-07 Difference and cause analysis of drying characteristics of different shapes sludge. MA Xue-wen, WENG Huan-xin*, ZHANG Jin-jun (Institute of Environment and Biogeochemistry, Zhejiang University, Hangzhou 310027, China). China Environmental Science, 2011,31(5)：803~809 Abstract：Through determination of weight loss rates and dry basis change of cake sludge and spherical sludge dried at 100~300℃, differences of drying characteristics of the two kinds of sludge were analyzed. Cake sludge cracked and split into several small pieces, while spherical sludge only shrank without shape change. Different apparent change led to different drying process. Cake sludge drying process was divided into two stages:acceleration stage and deceleration stage, while spherical sludge drying process was divided into three stages: acceleration stage, constant speed stage and deceleration stage. The average drying rate of cake sludge was bigger than spherical sludge. When dried above 150℃, organic matter of cake sludge began to decompose with water evaporating, while organic matter of spherical sludge didn’t decompose until most of water evaporated. Key words：sewage sludge；cake sludge；spherical sludge；drying characteristics 污水处理过程中会产生大量的污泥,据估 燥经验并不适用于污泥干燥.特别是由于不同的 计,2010 年我国污泥的产生量将超过