高含固污泥在热水解-厌氧消化工艺中的流变特性分析  

Analysis on rheological characterization of high solid sludge in process of thermal hydrolysis-anaerobic digestion

作　　者：曹秀芹[1] 王鑫[1] 蒋竹荷 刘青青[1] 

机构地区：[1]北京建筑大学环境与能源工程学院城市雨水系统与水环境省部共建教育部重点实验室,北京100044

出　　处：《环境工程学报》2017年第4期2493-2498,共6页Chinese Journal of Environmental Engineering

基　　金：北京市教委(北京市自然科学基金)科技重点项目(KZ201310016017)

摘　　要：对热水解-中温厌氧消化联合工艺中的高含固率调配污泥、热水解污泥和消化污泥的流变特性进行分析,考察了3种污泥的黏度、屈服应力和触变性等流变特征指标在不同工艺中的变化规律,并讨论了TSS对污泥流变特性的影响。结果表明:调配污泥、热水解污泥和消化污泥均为假塑性非牛顿流体,都可用Herschel-Bulkley模型进行描述;极限黏度与TSS之间呈指数关系;屈服应力在TSS高于7.3%时增长趋势加剧,流动性变差;热水解污泥和消化污泥的触变性与调配污泥相比降低50%以上,使用触变性动力学系数K来表征污泥的触变性较滞后环更适宜。The rheological properties of three kinds of high solid sludge,mixed,thermally hydrolyzed and digested sludge,were analyzed in the combined process of thermal hydrolysis and mesophilic anaerobic digestion. The variation of viscosity,yield stress and thixotropy was investigated,and discussing TSS influence on the rheology of sludge. The results showed that these three kinds of sludge were non-Newtonian pseudo-plastic fluids,and their fluid features could be depicted by Herschel-Bulkley model. The limit viscosity showed exponential relationship with TSS. The yield stress increases significantly when TSS is higher than 7. 3%,and flow becomes worse.The thixotropy of thermally hydrolyzed and digested sludge decreased more than 50%,compared to mixed sludge,and thixotropic kinetic coefficient K of sludge is much better for characterizing thixotropism than hysteresis loop.

关 键 词：高含固污泥 流变特性 热水解-厌氧消化联合工艺 Herschel-Bulkley模型 TSS 

分 类 号：X705[环境科学与工程—环境工程]