摘要
降低污泥的含水率与体积对污泥的运输和处置具有重要意义,对造粒后的污泥颗粒在热干化与微波辅助干化过程中的水分和粒径进行分析,采用原含水率在80%~85%的离心脱水污泥为研究对象,分别以污泥减容率、污泥含水率降至40%为评价指标,采用Box-Behnken响应曲面法考察了添加剂的添加量、物料质量、微波加热时间与污泥直径对活性污泥的干化过程造成单独作用及交互作用的影响。实验结果表明,添加氧化钙对污泥造粒效果有一定提升;污泥减容率提升的最佳条件为:氧化钙质量分数为3.94%、直径为3.05 mm、微波加热时间为0.85 min。污泥含水率降低的最佳条件为:氧化钙质量分数为3.95%、直径为3.27 mm、微波加热时间为3.98 min。
Reducing the moisture content and volume is of great significance to the transportation and disposal of sludge.In this paper,the moisture and particle size of sludge granulation in thermal drying process and microwave drying were studied.The sludge after centrifugal dehydration was used as the research object and the moisture content of the original sludge is 80%~85%.The moisture content was reduced to 40%and the volume reduction rate of sludge was set as the evaluation index.The factors such as additive agent,heating weight,microwave time,particle size on sludge granulation and drying process were evaluated by utilizing Box-Behnken response surface methodology.The experimental results show that the granulation effect of sludge has been improved by adding calcium oxide.The optimal conditions for the sludge volume reduction rate were determined:calcium oxide addition is 3.94%,sludge diameter is 3.05 mm,microwave time is 0.85 min.The optimal conditions for the reduction of sludge moisture content were determined:calcium oxide addition rate is 3.95%,sludge diameter is 3.27 mm,microwave time is 3.98 min.That experimental result provides a favorable basis for sludge granulation and drying treatment.
作者
周翠红
曾婉琳
陈佳蕊
鲍颖杰
赵昆鹏
ZHOU Cuihong;ZENG Wanlin;CHEN Jiarui;BAO Yingjie;ZHAO Kunpeng(Department of Environmental Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《北京石油化工学院学报》
2021年第4期51-55,共5页
Journal of Beijing Institute of Petrochemical Technology
基金
国家自然科学基金青年基金资助项目(51104022)
大学生研究训练计划资助项目(2018J00169)。
关键词
污泥
含水率
粒径
减容率
微波
activated sludge
moisture content
particle size
reduction rate
microwave
