低温热水解对污泥触变性及脱水性能的影响
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摘要
污泥经过热水解预处理后,其流变和理化性质发生了不可逆的变化。为实现后续污泥处理处置过程的最优化,分别采用触变动力学系数(K)和离心脱水泥饼的总固体含量(TS)作为污泥触变性及脱水性能的评价指标,系统研究低温热水解(60～90℃)对于污泥触变性及脱水性的影响。结果表明,热水解48 h后,污泥的触变性增大,脱水性能提高,且热水解温度的升高与触变性的增大和脱水性能的提高呈对数关系。污泥脱水性的提高与触变性的增强呈良好的线性关系,触变动力学系数有望成为比较污泥脱水性能的新工具,从流变学角度提出了评价污泥脱水性能的新方法。
When sludge was subjected to thermal hydrolysis, an irreversible change occurred on its rheological and physicochemical properties. To optimize the subsequent sludge treatment and disposal process, the effect of low-temperature thermal hydrolysis(60～90 ℃) on its thixotropy and dewaterability was systematically investigated when the thixotropic kinetic coefficient(K) and the total solids(TS) of the centrifugal dewatered cake were taken as the evaluation indicator of sludge thixotropy and dewaterability, respectively. Experimental results show that sludge thixotropy and dewaterability increased after 48 h thermal hydrolysis, the logarithmic increase correlations were observed between heating temperature and thixotropy or dewaterability. Moreover, sludge dewaterability increase due to thermal treatment was logarithmically proportional to its thixotropy increase. This indicates that K could become a reliable tool to compare sludge dewaterability, and provide a new method to evaluate sludge dewaterability from a rheological perspective.
When sludge was subjected to thermal hydrolysis, an irreversible change occurred on its rheological and physicochemical properties. To optimize the subsequent sludge treatment and disposal process, the effect of low-temperature thermal hydrolysis(60～90 ℃) on its thixotropy and dewaterability was systematically investigated when the thixotropic kinetic coefficient(K) and the total solids(TS) of the centrifugal dewatered cake were taken as the evaluation indicator of sludge thixotropy and dewaterability, respectively. Experimental results show that sludge thixotropy and dewaterability increased after 48 h thermal hydrolysis, the logarithmic increase correlations were observed between heating temperature and thixotropy or dewaterability. Moreover, sludge dewaterability increase due to thermal treatment was logarithmically proportional to its thixotropy increase. This indicates that K could become a reliable tool to compare sludge dewaterability, and provide a new method to evaluate sludge dewaterability from a rheological perspective.
引文
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[21] XU H, HE P, YU G, et al. Effect of ultrasonic pretreatment on anaerobic digestion and its sludge dewaterability[J]. Journal of Environmental Science, 2011, 23(9):1472-1478.
[22] ZHANG J, LI N, DAI X, et al. Enhanced dewaterability of sludge during anaerobic digestion with thermal hydrolysis pretreat?ment:New insights through structure evolution[J]. Water Research, 2018, 131:177-185.
[23] OOSTERHUIS M, RINGOOT D, HENDRIKS A, et al. Thermal hydrolysis of waste activated sludge at hengelo wastewater treatment plant, the Netherlands[J]. Water Science and Technology, 2014, 70(1):1-7.
[24] FENG G, TAN W, ZHONG N, et al. Effects of thermal treatment on physical and expression dewatering characteristics of mu?nicipal sludge[J]. Chemical Engineering Journal, 2014, 247:223-230.
[25] LI N, HIROYASU S, TAKASHI M. Dynamics of dewaterability and bacterial populations in activated sludge[J]. Water Sci?ence and Technology, 2012, 66(8):1634-1640.
[26] XUE Y, LIU H, CHEN S, et al. Effects of thermal hydrolysis on organic matter solubilization and anaerobic digestion of high solid sludge[J]. Chemical Engineering Journal, 2015, 264:174-180.
[27] ZHOU Y, TAKAOKA M, WANG W, et al. Effect of thermal hydrolysis pre-treatment on anaerobic digestion of municipal bio?waste:A pilot scale study in China[J]. Journal of Bioscience and Bioengineering, 2013,116(1):101-105.
[28] URREA J L, COLLADO S, LACA A, et al. Rheological behaviour of activated sludge treated by thermal hydrolysis[J]. Jour?nal of Water Process Engineering, 2015, 5:153-159.
[29] LIAO B Q, ALLEN D G, LEPPARD G G,et al. Interparticle interactions affecting the stability of sludge flocs[J]. Journal of Colloid and Interface Science, 2002, 249(2):372-380.
[30] ZHANG W, PENG S, XIAO P, et al. Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability[J]. RSC Advances, 2015, 5(2):1282-1294.
[2] BOUGRIER C, DELGENES J P,CARRERE H. Effects of thermal treatments on five different waste activated sludge samples solubilisation, physical properties and anaerobic digestion[J]. Chemical Engineering Journal, 2008, 139(2):236-244.
[3] OOSTERHUIS M, RINGOOT D, HENDRIKS A, et al. Thermal hydrolysis of waste activated sludge at hengelo wastewater treatment plant, the netherlands[J]. Water Science and Technology, 2014, 70(1):1-7.
[4]张严之,王卉,张翼,等.高含固污泥中影响因素对流变特性的影响[J].环境工程学报, 2016, 10(12):7255-7259.
[5] CAO X, JIANG Z, CUI W, et al. Rheological properties of municipal sewage sludge:dependency on solid concentration and temperature[J]. Procedia Environmental Sciences, 2016, 31:113-121.
[6] RUIZ-HERNANDO M, LABANDA J, LLORENS J. Structural model to study the influence of thermal treatment on the thixo?tropic behaviour of waste activated sludge[J]. Chemical Engineering Journal, 2015, 262:242-249.
[7]王彦祥,何琴,李蕾,等.餐厨垃圾中温干式厌氧消化污泥的流变特性研究[J].环境科学学报, 2014, 34(12):3171-3178.
[8]曹秀芹,王鑫,蒋竹荷,等.高含固污泥在热水解-厌氧消化工艺中的流变特性分析[J].环境工程学报, 2017, 11(4):2493-2498.
[9] CAO X, JIANG K, WANG X, et al. Effect of total suspended solids and various treatment on rheological characteristics of municipal sludge[J]. Research on Chemical Intermediates, 2018, 44(9):5123-5138.
[10] XIAO K, SEOW W Y, CHEN Y, et al. Effects of thermal-Fe(II)activated oxone treatment on sludge dewaterability[J]. Chemi?cal Engineering Journal, 2017, 322:463-471.
[11] FENG G, LIU L, TAN W. Effect of thermal hydrolysis on rheological behavior of municipal sludge[J]. Industrial&Engineer?ing Chemistry Research, 2014, 53(27):11185-11192.
[12]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.
[13]韩芸,代璐,卓杨,等.热水解高含固污泥的有机物分布及厌氧消化特性[J].环境化学, 2016, 35(5):964-971.
[14] FARNO E, BAUDEZ J C, PARTHASARATHY R,et al. Impact of thermal treatment on the rheological properties and compo?sition of waste activated sludge:COD solubilisation as a footprint of rheological changes[J]. Chemical Engineering Journal,2016, 295:39-48.
[15] HONG E, YENENEH A M, SEN T K, et al. A comprehensive review on rheological studies of sludge from various sections of municipal wastewater treatment plants for enhancement of process performance[J]. Advances in Colloid and Interface Sci?ence, 2018, 257:19-30.
[16] XU H, HE P, SHAO L. Characteristics of organic matters during anaerobic digestion of ultrasonically pretreated sludge and the effects on sludge dewaterability[J]. Journal of Residuals Science&Technology, 2009, 6(3):119-124.
[17] YE F, LIU X, LI Y. Extracellular polymeric substances and dewaterability of waste activated sludge during anaerobic diges?tion[J]. Water Science and Technology, 2014, 70(9):1555-1560.
[18] KOPP J, MIILLER J, DICHTL N, et al. Anaerobic digestion and dewatering characteristics of mechanically disintegrated ex?cess sludge[J]. Water Science and Technology, 1997, 36(11):129-136.
[19] MIRON Y, ZEEMAN G, LIER J B, et al. The role of sludge retention time in the hydrolysis and acidification of lipids, carbo?hydrates and proteins during digestion of primary sludge in CSTR systems[J]. Water Research, 2000, 34(5):1705-1713.
[20] JENSEN P D, ASTALS S, LU Y, et al. Anaerobic codigestion of sewage sludge and glycerol, focusing on process kinetics, mi?crobial dynamics and sludge dewaterability[J]. Water Research, 2014, 67:355-366.
[21] XU H, HE P, YU G, et al. Effect of ultrasonic pretreatment on anaerobic digestion and its sludge dewaterability[J]. Journal of Environmental Science, 2011, 23(9):1472-1478.
[22] ZHANG J, LI N, DAI X, et al. Enhanced dewaterability of sludge during anaerobic digestion with thermal hydrolysis pretreat?ment:New insights through structure evolution[J]. Water Research, 2018, 131:177-185.
[23] OOSTERHUIS M, RINGOOT D, HENDRIKS A, et al. Thermal hydrolysis of waste activated sludge at hengelo wastewater treatment plant, the Netherlands[J]. Water Science and Technology, 2014, 70(1):1-7.
[24] FENG G, TAN W, ZHONG N, et al. Effects of thermal treatment on physical and expression dewatering characteristics of mu?nicipal sludge[J]. Chemical Engineering Journal, 2014, 247:223-230.
[25] LI N, HIROYASU S, TAKASHI M. Dynamics of dewaterability and bacterial populations in activated sludge[J]. Water Sci?ence and Technology, 2012, 66(8):1634-1640.
[26] XUE Y, LIU H, CHEN S, et al. Effects of thermal hydrolysis on organic matter solubilization and anaerobic digestion of high solid sludge[J]. Chemical Engineering Journal, 2015, 264:174-180.
[27] ZHOU Y, TAKAOKA M, WANG W, et al. Effect of thermal hydrolysis pre-treatment on anaerobic digestion of municipal bio?waste:A pilot scale study in China[J]. Journal of Bioscience and Bioengineering, 2013,116(1):101-105.
[28] URREA J L, COLLADO S, LACA A, et al. Rheological behaviour of activated sludge treated by thermal hydrolysis[J]. Jour?nal of Water Process Engineering, 2015, 5:153-159.
[29] LIAO B Q, ALLEN D G, LEPPARD G G,et al. Interparticle interactions affecting the stability of sludge flocs[J]. Journal of Colloid and Interface Science, 2002, 249(2):372-380.
[30] ZHANG W, PENG S, XIAO P, et al. Understanding the evolution of stratified extracellular polymeric substances in full-scale activated sludges in relation to dewaterability[J]. RSC Advances, 2015, 5(2):1282-1294.
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