总固体和温度对污泥流变特性的影响  

Effect of TS and Temperature on Rheological Properties of Sludge

作　　者：刘青青 曹秀芹 王鑫 尹伟奇 

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：《科学技术与工程》2018年第3期379-384,共6页Science Technology and Engineering

摘　　要：对污水厂的污泥进行流变特性分析,考察不同总固体(total solid,TS)下污泥的极限黏度、屈服应力、触变性等流变特征指标的变化规律,并重点探讨TS和温度对污泥流变特性的影响。结果表明:当活性污泥TS为0.86%时,剪切速率从0~100 s-1的过程中,污泥具有假塑性流体的特征,但随剪切速率的不断增大(100~1 000 s-1时),表现出胀塑性流体的特征,其流变特性可用Herschel-Bulkley模型来描述。屈服应力与TS的呈幂律关系;极限黏度和触变环面积与TS呈指数关系;污泥黏度和触变环面积随温度升高而呈现降低趋势,且低剪切速率对黏度这种趋势的影响更加显著。The rheological properties of the sludge in the wastewater treatment plant were analyzed,and the changes of the rheological characteristics such as limit viscosity,yield stress and thixotropy of sludge with different TS were investigated. The effects of TS and temperature on sludge rheology characteristics were discussed. The results indicated that when the active sludge TS is 0. 86% showed the characteristics of pseudoplastic fluid as the shear rate increased from 0 to 100 s-（-1）,but showed the characteristics of the expanded plastic fluid with the increasing shear rate（ from 100 s^-1 tot1 000 s^-1）. The variable properties can be described by the Herschel-Bulkley model; the yield stress is in the power-law relation with TS; the limiting viscosity and the area of the thixotropic ring are exponentially related to the TS; the sludge viscosity and the area of the thixotropic ring decreased with increasing temperature. And the changes in viscosity were more obvious at low shear rate,but it was not significant at high shear rate.

关 键 词：污泥 流变特性 极限黏度 屈服应力 触变性 

分 类 号：X703[环境科学与工程—环境工程]