基于降解-渗流-温度耦合模型的渗滤液回灌数值模拟
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摘要
渗滤液回灌能加速生化反应器填埋场的稳定,而回灌参数决定了回灌加速效果.为研究不同回灌条件下填埋场的稳定化进程以选择最佳回灌参数,在考虑含水率、VFA浓度和温度对垃圾降解影响的条件下,基于COMSOL Multiphysics 5.0建立了二维降解-渗流-温度耦合回灌模型并进行了验证;并采用本模型模拟单次回灌量为4 L的点源回灌,回灌频率分别为1、2、3 d·次-1,结果显示2 d·次-1的回灌条件下填埋场最先达到相对稳定状态;对比分析VFA浓度、垃圾降解速率、甲烷菌浓度的变化趋势,结果表明高回灌频率更有利于填埋场加速进入甲烷化阶段,而在确保含水率低影响的情况下低回灌频率更有利于进入稳定化阶段,因此实际工程中要综合考虑以选择合适的回灌参数.
Leachate recirculation can accelerate the stabilization of bioreactor landfill,and the parameters of recirculation determine the quality. In order to study the stabilization process of the landfill under different recirculation conditions and to select the optimum parameters,a two-dimensional biologicalhydro-thermo coupling model was established based on COMSOL Multiphysics 5. 0 in consideration of the influences of water content,VFA and temperature on degradation. This model was then adopted to simulate the stabilization process of landfill with recirculation mode of point source,volume of4 L,frequency of 1,2,3 d per time,and that landfill of 2 d per time achieve stability firstly. The variations of VFA concentration,degradation rate of solid waste and methanogens concentration were comparably analyzed,and the result indicated that high recirculation frequency is more favorable for landfill to accelerate into the methane phase whereas low frequency has more advantages from the stage of methane to stabilization under the condition of low impact by water content. Therefore,appropriate parameters should be selected after comprehensive consideration in the actual application.
Leachate recirculation can accelerate the stabilization of bioreactor landfill,and the parameters of recirculation determine the quality. In order to study the stabilization process of the landfill under different recirculation conditions and to select the optimum parameters,a two-dimensional biologicalhydro-thermo coupling model was established based on COMSOL Multiphysics 5. 0 in consideration of the influences of water content,VFA and temperature on degradation. This model was then adopted to simulate the stabilization process of landfill with recirculation mode of point source,volume of4 L,frequency of 1,2,3 d per time,and that landfill of 2 d per time achieve stability firstly. The variations of VFA concentration,degradation rate of solid waste and methanogens concentration were comparably analyzed,and the result indicated that high recirculation frequency is more favorable for landfill to accelerate into the methane phase whereas low frequency has more advantages from the stage of methane to stabilization under the condition of low impact by water content. Therefore,appropriate parameters should be selected after comprehensive consideration in the actual application.
引文
Chanthikul S,Qasim S R,Mukhopadhyay B,et al.2004.Computer simulation of leachate quality by recirculation in a sanitary landfill bioreactor[J].Journal of Environmental Science and Health,39(2):493-505
邓舟,蒋建国,杨国栋,等.2006.渗滤液回灌量对其特性及填埋场稳定化的影响[J].环境科学,27(1):185-188
冯世进,张旭.2012.考虑垃圾体沉降的生物反应器填埋场渗滤液回灌运移规律[J].岩土工程学报,34(10):1836-1842
郭汝阳,陈云敏,李育超,等.2015.考虑p H值和挥发性脂肪酸影响的填埋城市固废厌氧降解模型[J].中国环境科学,35(1):147-156
韩智勇,刘丹,李启彬,等.2009.厌氧型生物反应器产CH4期水解动力学模型研究[J].环境科学研究,22(3):299-303
Haridasan M,Jensen R D.1972.Effect of temperature on pressure headwater content relationship and conductivity of two soils[J].Soil Science Society of America Journal,36(5):703-708
何春木,邱战洪,陈合龙,等.2015.南方地区城市生活垃圾导热系数的试验研究[J].岩土力学,36(4):1057-1062
贺玉龙.2003.三场耦合作用相关试验及耦合强度量化研究[D].西南交通大学.1-137
候长亮,赵颖.2009.孔隙率及降解时间对垃圾土-水特征曲线影响的试验研究[J].武汉工业学院学报,28(3):106-109
Jiang B J,Tian Z J,Jiang J M,et al.2014.The parameters control of recirculation treatment for leachate[J].Advanced Materials Research,1015:340-345
Kasali G B,Senior E.1989.Effects of temperature and moisture on the anaerobic digestion of refuse[J].Journal of Chemical Technology and Biotechnology,44(1):31-41
李启彬.2001.基于渗滤液回灌的厌氧型生物反应器填埋场快速稳定研究[D].成都:西南交通大学.1-163
Meima J A,Mora Naranjo N,Haarstrick A,et al.2008.Sensitivity analysis and literature review of parameters controlling local biodegradation processes in municipal solid waste landfills[J].Waste Management,28(5):904-918
Mora Naranjo N,Meima J A,Haarstrick A,et al.2004.Modelling and experimental investigation of environmental influences on the acetate and methane formation in solid waste[J].Waste Management,24(8):763-773
Nakasaki K,Kwon S H,Takemoto Y,et al.2015.An interesting correlation between methane production rates and archaea cell density during anaerobic digestion with increasing organic loading[J].Biomass and Bioenergy,78:17-24
Reddy K R,Giri R K,Kulkarni H S,et al.2014.Validation of twophase flow model for leachate recirculation in bioreactor landfills[J].Journal of Waste Management,doi:http://dx.doi.org/10.1155/2014/308603
Sponza D T,A gda gO N.2004.Impact of leachate recirculation and recirculation volume on stabilization of municipal solid wastes in simulated anaerobic bioreactors[J].Process Biochemistry,39(12):2157-2165
Sanphoti N,Towprayoon S,Chaiprasert P,et al.2006.The effects of leachate recirculation with supplemental water addition on methane production and waste decomposition in a simulated tropical landfill[J].Journal of Environmental Management,81(1):27-35
Van Genuchten M T.1980.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science SocI ety of America Journal,44(5):892-898
Vavilin V A,Rytov S V,Lokshia L Y,et al.2003.Distributed model of solid waste anaerobic digestion effects of leachate recirculation and p H adjustment[J].Biotechnology and Bioengineering,48(4):147-154
王洪涛,殷勇.2003.渗滤液回灌条件下生物反应器填埋场水分运移数值模拟[J].环境科学,24(2):67-72
Wang Y Y,Zhang Y L,Wang J B,et al.2009.Effects of volatile fatty acid concentrations on methane yield and methanogenic bacteria[J].Biomass and Bioenergy,33(5):848-853
徐晓兵.2011.基于降解-渗流-压缩揭合模型的填埋场垃圾固液气相互作用分析及工程应用[D].杭州:浙江大学.1-173
薛强,赵颖,刘磊,等.2011.垃圾填埋场灾变过程的温度-渗流-应力-化学耦合效应研究[J].岩石力学与工程学报,30(10):1970-1987
杨军.2007.城市生活垃圾填埋处置中的温度一化学耦合作用研究[D].成都:西南交通大学.1-109
张纬,薛强,刘磊,等.2007.季节性气候变化对填埋场温度分布影响的研究[J].地下空间与工程学报,3(8):1541-1544
赵杰红,张波,蔡伟民,等.2006.温度对厨余垃圾两相厌氧消化中水解和酸化过程的影响[J].环境科学,27(8):1682-1686
邓舟,蒋建国,杨国栋,等.2006.渗滤液回灌量对其特性及填埋场稳定化的影响[J].环境科学,27(1):185-188
冯世进,张旭.2012.考虑垃圾体沉降的生物反应器填埋场渗滤液回灌运移规律[J].岩土工程学报,34(10):1836-1842
郭汝阳,陈云敏,李育超,等.2015.考虑p H值和挥发性脂肪酸影响的填埋城市固废厌氧降解模型[J].中国环境科学,35(1):147-156
韩智勇,刘丹,李启彬,等.2009.厌氧型生物反应器产CH4期水解动力学模型研究[J].环境科学研究,22(3):299-303
Haridasan M,Jensen R D.1972.Effect of temperature on pressure headwater content relationship and conductivity of two soils[J].Soil Science Society of America Journal,36(5):703-708
何春木,邱战洪,陈合龙,等.2015.南方地区城市生活垃圾导热系数的试验研究[J].岩土力学,36(4):1057-1062
贺玉龙.2003.三场耦合作用相关试验及耦合强度量化研究[D].西南交通大学.1-137
候长亮,赵颖.2009.孔隙率及降解时间对垃圾土-水特征曲线影响的试验研究[J].武汉工业学院学报,28(3):106-109
Jiang B J,Tian Z J,Jiang J M,et al.2014.The parameters control of recirculation treatment for leachate[J].Advanced Materials Research,1015:340-345
Kasali G B,Senior E.1989.Effects of temperature and moisture on the anaerobic digestion of refuse[J].Journal of Chemical Technology and Biotechnology,44(1):31-41
李启彬.2001.基于渗滤液回灌的厌氧型生物反应器填埋场快速稳定研究[D].成都:西南交通大学.1-163
Meima J A,Mora Naranjo N,Haarstrick A,et al.2008.Sensitivity analysis and literature review of parameters controlling local biodegradation processes in municipal solid waste landfills[J].Waste Management,28(5):904-918
Mora Naranjo N,Meima J A,Haarstrick A,et al.2004.Modelling and experimental investigation of environmental influences on the acetate and methane formation in solid waste[J].Waste Management,24(8):763-773
Nakasaki K,Kwon S H,Takemoto Y,et al.2015.An interesting correlation between methane production rates and archaea cell density during anaerobic digestion with increasing organic loading[J].Biomass and Bioenergy,78:17-24
Reddy K R,Giri R K,Kulkarni H S,et al.2014.Validation of twophase flow model for leachate recirculation in bioreactor landfills[J].Journal of Waste Management,doi:http://dx.doi.org/10.1155/2014/308603
Sponza D T,A gda gO N.2004.Impact of leachate recirculation and recirculation volume on stabilization of municipal solid wastes in simulated anaerobic bioreactors[J].Process Biochemistry,39(12):2157-2165
Sanphoti N,Towprayoon S,Chaiprasert P,et al.2006.The effects of leachate recirculation with supplemental water addition on methane production and waste decomposition in a simulated tropical landfill[J].Journal of Environmental Management,81(1):27-35
Van Genuchten M T.1980.A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J].Soil Science SocI ety of America Journal,44(5):892-898
Vavilin V A,Rytov S V,Lokshia L Y,et al.2003.Distributed model of solid waste anaerobic digestion effects of leachate recirculation and p H adjustment[J].Biotechnology and Bioengineering,48(4):147-154
王洪涛,殷勇.2003.渗滤液回灌条件下生物反应器填埋场水分运移数值模拟[J].环境科学,24(2):67-72
Wang Y Y,Zhang Y L,Wang J B,et al.2009.Effects of volatile fatty acid concentrations on methane yield and methanogenic bacteria[J].Biomass and Bioenergy,33(5):848-853
徐晓兵.2011.基于降解-渗流-压缩揭合模型的填埋场垃圾固液气相互作用分析及工程应用[D].杭州:浙江大学.1-173
薛强,赵颖,刘磊,等.2011.垃圾填埋场灾变过程的温度-渗流-应力-化学耦合效应研究[J].岩石力学与工程学报,30(10):1970-1987
杨军.2007.城市生活垃圾填埋处置中的温度一化学耦合作用研究[D].成都:西南交通大学.1-109
张纬,薛强,刘磊,等.2007.季节性气候变化对填埋场温度分布影响的研究[J].地下空间与工程学报,3(8):1541-1544
赵杰红,张波,蔡伟民,等.2006.温度对厨余垃圾两相厌氧消化中水解和酸化过程的影响[J].环境科学,27(8):1682-1686