处置库污泥工程特性测试研究
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摘要
对某填埋场污泥库中取样的污泥进行了岩土工程特性测试,包括有机质含量、含水率、界限含水率、颗粒级配、渗透系数、压缩固结特性及抗剪强度等。试验结果表明,与常规淤泥相比,污泥库中经一段时间降解后污泥有机质含量及含水率较高,平均值分别为45%和520%;污泥在历时2 a的生物降解作用下,污泥含水率、有机质含量沿深度呈较为明显的减少趋势;污泥具有极高的压缩性,压缩系数a100-200高达7 MPa-1;污泥的固结表现为非线性大变形特性,其固结系数在10-5～10-6cm2/s,比淤泥低1～2个数量级,固结系数随压力的增加而显著减少;污泥的抗剪强度参数较小,其黏聚力为0,内摩擦角为14.7°。有机质含量高是污泥高含水率、高液塑性指数、高压缩性,低渗透性、低固结系数及低抗剪强度的本质原因。以上成果可为污泥库的固化处置、稳定分析等提供必要的参数。
Laboratory tests are conducted to investigate geotechnical properties of sewage sludge in a sludge reservoir of a landfill,including organic content,water content,limit content,grain-size distribution,permeability coefficient,shear strength and consolidation coefficient.Test results show that the sewage sludge in the reservoir has much higher organic content and water content than the muddy soil.The average value of organic content is 45% and water content is 520%,respectively.As a result of biodegradation with a period of two years,both organic content and water content of the sewage sludge in the sludge reservoir show a decreasing trend with the depth.The sewage sludge had a very high compressibility,and the value of a100-200 is 7 MPa-1.The consolidation of the sewage sludge shows a nonlinear large deformation behavior;and the coefficient of consolidation is of the order 10-5-10-6 cm2/s,showing a significant decreasing trend with an increase of normal stress.The shear strength parameters are low with a cohesion of 0 kPa and an internal friction angle of 14.7°.The high organic content is the essential reason for the high values in water content,plasticity index and compressibility as well as the low values in permeability,consolidation coefficient and shear strength.The experimental results provide necessary parameters for the disposal of sludge reservoir and analysis of stability.
Laboratory tests are conducted to investigate geotechnical properties of sewage sludge in a sludge reservoir of a landfill,including organic content,water content,limit content,grain-size distribution,permeability coefficient,shear strength and consolidation coefficient.Test results show that the sewage sludge in the reservoir has much higher organic content and water content than the muddy soil.The average value of organic content is 45% and water content is 520%,respectively.As a result of biodegradation with a period of two years,both organic content and water content of the sewage sludge in the sludge reservoir show a decreasing trend with the depth.The sewage sludge had a very high compressibility,and the value of a100-200 is 7 MPa-1.The consolidation of the sewage sludge shows a nonlinear large deformation behavior;and the coefficient of consolidation is of the order 10-5-10-6 cm2/s,showing a significant decreasing trend with an increase of normal stress.The shear strength parameters are low with a cohesion of 0 kPa and an internal friction angle of 14.7°.The high organic content is the essential reason for the high values in water content,plasticity index and compressibility as well as the low values in permeability,consolidation coefficient and shear strength.The experimental results provide necessary parameters for the disposal of sludge reservoir and analysis of stability.
引文
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[17]谢新宇,夏建中,朱向荣,等.饱和土体一维大变形固结系数研究[J].浙江大学学报(工学版),1998,32(3):319-324.XIE Xin-yu,XIA Jian-zhong,ZHU Xiang-rong,et al.Theresearch on the one dimensional large strain coeffcient ofconsolidation for saturated soil[J].Zhejiang University(Engineering Science),1998,32(3):319-624.
[18]DILIUNAS JONAS,DUNDULIS KASTYTIS,GADEIKIS SAULIUS,Arunas Jurevicius.Mykolas.Kaminskas.Geotechnical and hydrochemical propertiesof sewage sludge[J].Bulletin of Engineering Geologyand the Environment,2010,69(4):575-582.
[2]污泥无害化、减量化、资源化处理新技术[M].北京:科学出版社,2009.
[3]张华,范建军,赵由才.基于填埋处置的污水厂脱水污泥土工性质研究[J].同济大学学报(自然科学版),2008,36(3):361-365.ZHANG Hua,FAN Jian-jun,ZHAO You-cai.Geotechnical characterization of dewatered sewagesludge for landfilling[J].Journal of Tongji University(Natural Science),2008,36(3):361-365.
[4]O’XELLY BREDNDAN C.Geotechnical properties of amunicipal water treatment sludge incorporating acoagulant[J].Canadian Geotechnical Journal,2008,45(5):715-725.
[5]O’XELLY BREDNDAN C.Geotechnical properties ofmunicipal sewage sludge[J].Geotechnical andGeological Engineering,2006,24(4):833-850.
[6]O’XELLY BREDNDAN C.Consolidation properties of adewatered municipal sewage sludge[J].CanadianGeotechnical Journal,2005,42(5):1350-1358.
[7]O’XELLY BREDNDAN C.Mechanical properties ofdewatered sewage sludge[J].Waste Management,2005,25(1):47-52.
[8]曹永华,闫澍旺,赵乐军.固化污泥的工程性质及微观结构特征[J].岩土力学,2006,27(5):740-744.CAO Yong-hua,YAN Shu-wang,ZHAO Le-jun.Engineering properties and microstructure feature ofsolidified sludge[J].Rock and Soil Mechanics,2006,27(5):740-744.
[9]郑修军,朱伟,李磊,等.污泥固化材料优选试验研究[J].岩土力学,2008,29(增刊):571-574.ZHENG Xiu-jun,ZHU Wei,LI Lei,et al.Optimizationexperiment study of sludge solidifying materials[J].Rockand Soil Mechanics,2008,29(Supp.):571-574.
[10]朱伟,李磊,林城.生物化学作用对污泥固化体渗透性的影响[J].岩土力学,2006,27(6):933-936.ZHU Wei,LI Lei,LIN Cheng.Biochemical effects onpermeability of solidified sludge[J].Rock and SoilMechanics,2006,27(6):933-936.
[11]李磊,朱伟,林城,等.干湿循环条件下固化污泥的物理稳定性研究[J].岩土力学,2009,30(12):1778-1782.LI Lei,ZHU Wei,LIN Cheng,et al.Study of wet and dryproperties of solidified sludge[J].Rock and SoilMechanics,2009,30(12):1778-1782.
[12]中华人民共和国建设部.GB/T50123-1999土工试验方法标准[S].北京:中国计划出版社,1999.
[13]中华人民共和国建设部.CJ/T221-2005城市污水处理厂污泥检验方法[S].北京:中国标准出版社,2009.
[14]IMHOFF K,MULLER W J,THISTLETHWAYTE D K B.disposal of sewage and other water Borne Wastes[M].London:Butterworth Co.,Ltd.,1971.
[15]CAMPBELL H W,RUSH R J,TEW R.Sludgedewatering design manual research report[R].Burlington:Ontario Ministry of the Environment,1978.
[16]CHEN YUNMIN,LIN WEIAN,TONY L,et al.Investigation of mechanisms of bentonite extrusion fromGCLs and related effects on the shear strength ofGCL/GM interfaces[J].Geotextiles and Geomembranes,2010,28(1):63-71.
[17]谢新宇,夏建中,朱向荣,等.饱和土体一维大变形固结系数研究[J].浙江大学学报(工学版),1998,32(3):319-324.XIE Xin-yu,XIA Jian-zhong,ZHU Xiang-rong,et al.Theresearch on the one dimensional large strain coeffcient ofconsolidation for saturated soil[J].Zhejiang University(Engineering Science),1998,32(3):319-624.
[18]DILIUNAS JONAS,DUNDULIS KASTYTIS,GADEIKIS SAULIUS,Arunas Jurevicius.Mykolas.Kaminskas.Geotechnical and hydrochemical propertiesof sewage sludge[J].Bulletin of Engineering Geologyand the Environment,2010,69(4):575-582.