高含固污泥在热水解-厌氧消化工艺中的流变特性分析
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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.
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.
引文
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[2]CARREREA H,DUMASA C,BATTIMELLIA A,et al.Pretreatment methods to improve sludge anaerobic degradability:A review[J].Journal of Hazardous Materials,2010,183:1-15
[3]曹秀芹,崔伟莎,杨平,等.污水厂污泥流变特性变化规律[J].环境工程学报,2015,9(4):1956-1962
[4]刘刈,邓良伟,王智勇.几种厌氧消化原料的流变特性及其影响因素[J].农业工程学报,2009,25(8):204-209
[5]SEYSSIECQ I,FERRASSE J H,ROCHE N,et al.State-of-the-Art:Rheological characterisation of wastewater treatment sludge[J].Biochemical Engineering Journal,2003,16(1):41-56.
[6]ESHTIAGHI N,MARKIS F,YAP S D,et al.Rheological characterisation of municipal sludge:A review[J].Water Research,2014,47(15):5493-5510
[7]戴晓虎,盖鑫,董滨.高含固厌氧消化污泥流变特性[J].环境工程学报,2014,8(9):3912-3918
[8]EHSAN F,JEAN C B,RAJARATHINAM P,et al.Rheological characterisation of thermally-treated anaerobic Digested sludge:Impact of temperature and thermal history[J].Water Research,2014,(32):156-161
[9]BAUDEZ J C,SLATTER P,ESHTIAGHI N.The impact of temperature on the rheological behaviour of anaerobic digested sludge[J].Chemical Engineering Journal,2013,215(16):182-187
[10]BAUDEZ J C,GUPTA R,ESHTIAGHI N,et al.The viscoelastic behaviour of raw and anaerobic digested sludge:Strong similarities with soft-glassy materials[J].Water Research,2012,47:173-180
[11]SLATTER P T.The rheological characterization of sludges[J].Water Science and Technology,1997,36(11):9-18
[12]MONTEIRO P.The influence of the anaerobic digestion Process on the sewage sludges rheological behaviour[J].Water Science and Technology,1997,36(11):61-67
[13]COUSSOT P.Rheometry of Pastes,Suspensions,and Granular Materials:Applications in Industry and Environment[C].Wiley,Hoboken,New Jersey,U.S.A.
[14]CLIMENT M,FERRER I,BAEZA M D M,et al.Effects of thermal and mechanical pretreatments of secondary sludge on biogas production under thermophilic conditions[J].Chemical Engineering Journal,2007,133(1):335-342
[15]LABANDA J,LLORENS J.Improvement of the deflocculating power of polyacrylates in ceramic slips by small additions of quaternary ammonium salts[J].Powder Technology,2005,155:181-186
[16]RUIZ-HERNANDO M,LABANDA J,LLORENS J,et al.Structural model to study the influence of thermal treatment on the Thixotropic behavior of waste activated sludge[J].Chemical Engineering Journal,2015,262:242-249
[17]TIXIER N,GUIBAUD G,BAUDU M,et al.Determination of some rheological parameters for the characterization of activated sludge[J].Bioresource Technology,2013,90(10):215-220