对影响热水解污泥临界剪切应力主要因素的实验研究
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摘要
热水解广泛应用于污泥厌氧消化的预处理之中,研究热水解污泥临界剪切应力的主要影响因素,准确预测污泥流变特性,对后续厌氧反应器的有效运行是十分必要的.本文研究了预剪切强度、温度(15~85℃)、浓度(8.6%~15.6%)、剪切速率范围(0.01~1000 s-1)对热水解污泥临界剪切应力的影响.实验采用含固率(Total solid,简称TS)8.6%10%时,流动曲线符合改进的Herschel-Bulkley模型.
Thermal hydrolysis is a widely used pretreatment method in anaerobic digestion system. The influencing factors on the critical shear stress of thermal hydrolyzed sludge and accurate prediction of flow behavior are essential for the subsequent anaerobic digestion. In this work,rheological experiments were conducted to study the effects of pre-shear intensity,temperature( 15 ~ 85 ℃),total solid( 8.6% ~ 15.6%),and the range of shear rate( 0.01~1000 s-1) on the critical shear stress within the flow curves. Thermal hydrolyzed sludges with TS content of 8.6% ~15.6% were sheared from 0.01 s-1 to 1000 s-1. The results indicate that the critical shear stress depends on TS content and the range of applied shear rate,rather than the intensity of pre-shear and tested temperature. For the sludges with TS less than 10%,the flow curve can be fitted well by the Herschel-Bulkley model; for the sludges with TS equal to 10%,a critical shear stress appeared on the flow curve within the shear rate of 0.1 ~ 10 s-1 and divided the flow curve into two sections;for the sludges with TS more than 10%,the flow curves can be fitted well by the revised Herschel-Bulkley model.
Thermal hydrolysis is a widely used pretreatment method in anaerobic digestion system. The influencing factors on the critical shear stress of thermal hydrolyzed sludge and accurate prediction of flow behavior are essential for the subsequent anaerobic digestion. In this work,rheological experiments were conducted to study the effects of pre-shear intensity,temperature( 15 ~ 85 ℃),total solid( 8.6% ~ 15.6%),and the range of shear rate( 0.01~1000 s-1) on the critical shear stress within the flow curves. Thermal hydrolyzed sludges with TS content of 8.6% ~15.6% were sheared from 0.01 s-1 to 1000 s-1. The results indicate that the critical shear stress depends on TS content and the range of applied shear rate,rather than the intensity of pre-shear and tested temperature. For the sludges with TS less than 10%,the flow curve can be fitted well by the Herschel-Bulkley model; for the sludges with TS equal to 10%,a critical shear stress appeared on the flow curve within the shear rate of 0.1 ~ 10 s-1 and divided the flow curve into two sections;for the sludges with TS more than 10%,the flow curves can be fitted well by the revised Herschel-Bulkley model.
引文
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Urrea J L,Collado S,Laca A,et al.2015.Rheological behaviour of activated sludge treated by thermal hydrolysis[J].Journal of Water Process Engineering,5:153-159
王远.2015.污泥厌氧消化流变特性变化规律的研究[D].北京:北京建筑大学
Zhang J,Xue Y,Eshtiaghi N,et al.2017.Evaluation of thermal hydrolysis efficiency of mechanically dewatered sewage sludge via rheological measurement[J].Water Research,116:34-43
Zhang J,Haward S J,Wu Z,et al.2016.Evolution of rheological characteristics of high-solid municipal sludge during anaerobic digestion[J].Applyed Rheology,26(3):1-10
Baroutian S,Eshtiaghi N,Gapes D J.2013.Rheology of a primary and secondary sewage sludge mixture:dependency on temperature and solid concentration[J].Bioresour Technology,140:227-233
Baudez J C,Coussot P.2001.Rheology of aging,concentrated,polymeric suspensions:Application to pasty sewage sludges[J].Journal of Rheology,45(5):1123-1139
Baudez J C.2006.About peak and loop in sludge rheograms[J].Journal of Environmental Management,78(3):232-239
Carrère H,Dumas C,Battimelli A,et al.2010.Pretreatment methods to improve sludge anaerobic degradability:a review[J].Journal of Hazardous Materials,183(1):1-15
曹秀芹,王远,蒋竹荷.2016.活性污泥流变特性主要影响因素及其研究进展[J].工业水处理,36(2):5-10
Chaignon V,Lartiges B S,El Samrani A,et al.2002.Evolution of size distribution and transfer of mineral particles between flocs in activated sludges:an insight into floc exchange dynamics[J].Water Research,36(3):676-684
Duan N,Dong B,Wu B,et al.2012.High-solid anaerobic digestion of sewage sludge under mesophilic conditions:feasibility study[J]Bioresour Technology,104:150-156
Farno E,Baudez J C,Parthasarathy R,et al.2014.Rheologica characterisation of thermally-treated anaerobic digested sludge:impact of temperature and thermal history[J].Water Research,56:156-161
Rha C.1975.Theory,determination and control of physical properties o food materials[J].Dordrecht:D.Reidel Publishing Company
Sapkaite I,Barrado E,Fdz-Polanco F,et al.2017.Optimization of a thermal hydrolysis process for sludge pre-treatment[J].Journal o Environmental Management,192:25-30
Seyssiecq I,Ferrasse J H,Roche N.2003.State-of-the-art:rheologica characterisation of wastewater treatment sludge[J].Biochemica Engineering Journal,16(1):41-56
Seyssiecq I,Marrot B,Djerroud,et al.2008.In situ triphasic rheologica characterisation of activated sludge,in an aerated bioreactor[J].Chemical Engineering Journal,142(1):40-47
Steffe J F.1996.Rheological methods in food process engineering[M].East Lansing:Freeman Press
Urrea J L,Collado S,Laca A,et al.2015.Rheological behaviour of activated sludge treated by thermal hydrolysis[J].Journal of Water Process Engineering,5:153-159
王远.2015.污泥厌氧消化流变特性变化规律的研究[D].北京:北京建筑大学
Zhang J,Xue Y,Eshtiaghi N,et al.2017.Evaluation of thermal hydrolysis efficiency of mechanically dewatered sewage sludge via rheological measurement[J].Water Research,116:34-43
Zhang J,Haward S J,Wu Z,et al.2016.Evolution of rheological characteristics of high-solid municipal sludge during anaerobic digestion[J].Applyed Rheology,26(3):1-10