添加CaO脱水污泥的微波干燥特性  

Microwave drying characteristics and kinetic model of thin-layer dehydrated sludge with CaO addition

作　　者：闫景武 杨朝晖[1,2] 黄兢[1,2] 赵丽君[1,2] 陈婷[1,2] 徐锐[1,2] 王慧玲[1,2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),长沙410082

出　　处：《环境工程学报》2016年第9期5128-5132,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51378189)

摘　　要：采用薄层干燥实验法对添加Ca O的脱水污泥进行微波干燥研究,考察了污泥的干燥特性,并引入干燥曲线对实验数据进行数值分析。结果表明,添加Ca O能减少污泥的干燥时间。污泥微波干燥过程主要分为升速干燥、恒速干燥和降速干燥3个阶段,且恒速干燥阶段所占的比例较大。数学模型分析发现,Page模型能更好地拟合薄层污泥的微波干燥过程。The drying process plays an important role in sewage sludge disposal. The thin-layer drying method, with CaO addition, was adopted to investigate the microwave drying characteristics of dehydrated sludge. The addition of CaO could reduce the sludge drying time. The parameters studied were the various thick- nesses （2, 4, and 8 mm） and the operating power （150, 300, 450, and 600 W）. Drying curves and drying rate curves were used to describe the drying process. The drying rate increased as the output power increased and the sludge thickness decreased, with the constant speed drying stage accounting for a larger proportion. The mathematical modeling showed that the Page model had superior prediction ability.

关 键 词：脱水污泥 微波干燥 CAO 干燥模型 

分 类 号：X703[环境科学与工程—环境工程]