摘要
针对水泥窑掺烧活性污泥的输送工艺和含水量要求,尾矿可协同掺烧的特点,研究了以有色金属锡矿尾矿协同脱除活性污泥水分,并以热重分析法和红外光谱分析法等方法探讨了脱水机制。结果表明:常温下,污泥中掺入有色金属锡矿尾矿后可使污泥的物理挤压方法脱水效果得到显著的改善,使内部结合水容易脱除分离出来,可达到深度脱水。尾矿粉掺入量为污泥质量的50%时可将污泥脱水率从物理挤压方法的60%左右进一步提高到90%以上,脱水后污泥的含水率从74%左右进一步下降到约40%,脱水效果显著。脱水后污泥质量可得到大幅缩减,脱水压滤饼固体化程度较高,粉碎性好,污泥的黏附性得到了显著的降低,可为实现污泥和有色金属尾矿在水泥窑协同掺烧大量化处置提供更为简便和能耗小的工艺前提条件。
According to the requirements of transportation technology and water content of activated sludge blending combustion in cement kiln,and the characteristics of tailings can also be co-blending combusted,non-ferrous tin tailings were used to remove moisture of municipal sludge,and the dehydration characteristics were discussed by thermogravimetric analysis and infrared spectrum methods.The results show that the dehydration effect of physical extrusion method of sludge with adding non-ferrous metal tin tailings into sludge can be significantly improved at ambient temperature,so that the internal bound water can be easy to remove and separate out with a deep dehydration.When the doping amount of tailing powder was 50%of the sludge quality,the sludge dewatering rate can be further increased from about 60%of the physical extrusion method to more than 90%,the moisture content of dehydrated sludge further decreased from about 74%to around 40%,dehydration was very effective.The quality of sludge can be greatly reduced after dehydration,the dehydrated filter cake has a high degree of solids and good pulverization,the adhesion of sludge was significantly reduced,that can provide simpler and less energy consuming process conditions for co-combustion large quantitative disposal of sludge and nonferrous metal tailings in cement kiln.
作者
翟颖
张敏
李竺娟
韦夏夏
张哲
唐富顺
ZHAI Ying;ZHANG Min;LI Zhu-juan;WEI Xia-xia;ZHANG Zhe;TANG Fu-shun(College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China)
出处
《科学技术与工程》
北大核心
2021年第33期14356-14365,共10页
Science Technology and Engineering
基金
广西科技计划项目(桂科AB16380276)。
关键词
活性污泥
锡矿尾矿
结合水
脱水率
脱水机制
municipal sludge
tin tailings
bound water
dehydration rate
dehydration mechanism
