水动力扰动对天然胶体在多孔介质中行为及效应的影响
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摘要
研究天然胶体在多孔介质中迁移沉积及环境效应,对土壤及地下水污染防治措施的选择与实践具有重要意义。以天然胶体作为实验材料,结合土柱实验和水槽搅拌实验,研究三种强度的水动力扰动对天然胶体的迁移和沉积特性及铜行为的影响。结果表明:胶体浓度一定时(土柱63mg/L),水动力扰动越强(最大流速约330mL/h),天然胶体越易穿透,达到平衡的时间越短,且平衡浓度越高;水动力扰动作用下,天然胶体对铜在多孔介质中的迁移起促进作用,而铜的吸附降低了天然胶体的迁移性。
The research on transport,deposition and environmental effect of natural colloid in porous media plays an important role in the prevention and management of soil and groundwater pollution.Taking natural colloid as experiment material,combining the test of soil column and water stir,the paper studied the effect of 3 different hydrodynamics on transport,deposition and copper behavior of natural colloids.The results indicated that when there is a constant concentration of colloid(soil columns:63 mg /L),the stronger the stir of water dynamics becomes,the easier the natural colloid is penetrated thrugh,the shorter the time of reaching balance,the higher the quilibrium concentration becomes.Under the role of hydrodynamics disturbance,the natural colloid play a promotion role for copper in transport of porous media,but copper adsorption decreases the mobility of natural colloid.
The research on transport,deposition and environmental effect of natural colloid in porous media plays an important role in the prevention and management of soil and groundwater pollution.Taking natural colloid as experiment material,combining the test of soil column and water stir,the paper studied the effect of 3 different hydrodynamics on transport,deposition and copper behavior of natural colloids.The results indicated that when there is a constant concentration of colloid(soil columns:63 mg /L),the stronger the stir of water dynamics becomes,the easier the natural colloid is penetrated thrugh,the shorter the time of reaching balance,the higher the quilibrium concentration becomes.Under the role of hydrodynamics disturbance,the natural colloid play a promotion role for copper in transport of porous media,but copper adsorption decreases the mobility of natural colloid.
引文
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[27]陈星欣,白冰,闫瑜龙,等.悬浮颗粒的浓度对其在饱和多孔介质中迁移和沉积特性的影响[J].岩土力学,2012,33(8):2343-2348.
[28]Zamani A,Maini B.Flow of dispersed particles through porous media-deep bed filtration[J].Journal of Petroleum Science and Engineering,2009,69(1):71-88.
[2]Shaoping H,Xincai C,Jiyan S,et al.Particle-facilitated lead and arsenic transport in abandoned mine sites soil influenced by simulated acid rain[J].Chemosphere,2008,71(11):2091-2097.
[3]Bin G,Cao X,Dong Y,et al.Colloid deposition and release in soils and their association with heavy metals[J].Critical Reviews in Environmental Science and Technology,2011,41(4):336-372.
[4]Bradford S A,Bettahar M.Straining,attachment,and detachment of oocysts in saturated porous media[J].Journal of Environmental Quality,2005,34(2):469-478.
[5]Shaoping H,Xincai C,Jiyan S,et al.Particle-facilitated lead and arsenic transport in abandoned mine sites soil influenced by simulated acid rain[J].Chemosphere,2008,71(11):2091-2097.
[6]Silva L F O,Hower J C,Izquierdo M,et al.Complex nanominerals and ultrafine particles assemblages in phosphogypsum of the fertilizer industry and implications on human exposure[J].Science of the Total Environment,2010,408(21):5117-5122.
[7]Ribeiro J,Flores D,Ward C R,et al.Identification of nanominerals and nanoparticles in burning coal waste piles from Portugal[J].Science of the Total Environment,2010,408(23):6032-6041.
[8]Jeong S W,Kim S D.Aggregation and transport of copper oxide nanoparticles in porous media[J].Journal of Environmental Monitoring,2009,11(9):1595-1600.
[9]Bradford S A,Bettahar M.Concentration dependent transport of colloids in saturated porous media[J].Journal of Contaminant Hydrology,2006,82(1):99-117.
[10]López-García J J,Aranda-Rascón M J,Horno J.Electrical double layer around a spherical colloid particle:The excluded volume effect[J].Journal of Colloid and Interface Science,2007,316(1):196-201.
[11]Gravelle A,Peysson Y,Tabary R,et al.Experimental investigation and modelling of colloidal release in porous media[J].Transport in Porous Media,2011,88(3):441-459.
[12]Tufenkji N,Elimelech M.Breakdown of colloid filtration theory:Role of the secondary energy minimum and surface charge heterogeneities[J].Langmuir,2005,21(3):841-852.
[13]Degueldre C,Benedicto A.Colloid generation during water flow transients[J].Applied Geochemistry,2012,27(6):1220-1225.
[14]殷宪强,孙慧敏,易磊,等.孔隙水流速对胶体在饱和多孔介质中运移的影响[J].水土保持学报,2010,24(5):101-104.
[15]Seto R,Botet R,Briesen H.Hydrodynamic stress on small colloidal aggregates in shear flow using Stokesian dynamics[J].Physical Review E,2011,84(4):041405(1-11).
[16]Shang J,Liu C,Wang Z.Transport and retention of engineered nanoporous particles in porous media:effects of concentration and flow dynamics[J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2013,417:89-98.
[17]Cao X J,Cummins H Z,Morris J F.Hydrodynamic and interparticle potential effects on aggregation of colloidal particles[J].Journal of colloid and interface science,2012,368(1):86-96.
[18]Pan W,Tartakovsky A M.Dissipative particle dynamics model for colloid transport in porous media[J].Advances in Water Resources,2013,58:41-48.
[19]孙慧敏,殷宪强,王益权.介质粗糙度和铅污染对粘土矿物胶体运移的影响[J].农业环境科学学报,2012,31(12):2361-2366.
[20]张战平,朱广伟,孙小静,等.水动力扰动作用对太湖水体胶体相痕量金属浓度影响的模拟[J].环境科学学报,2008,28(8):1674-1680.
[21]胡俊栋,鞠莉,寇小明,等.几种物理因素对四氧化三铁纳米颗粒在有机质存在条件下的饱和多孔介质中迁移持留行为的影响[J].农业环境科学学报,2010,29(10):2017-2024.
[22]褚灵阳,汪登俊,王玉军,等.不同环境因子对纳米羟基磷灰石在饱和填充柱中迁移规律的影响[J].环境科学,2011,32(8):2284-2291.
[23]Tian Y,Gao B,Ziegler K J.High mobility of SDBS-dispersed single-walled carbon nanotubes in saturated and unsaturated porous media[J].Journal of Hazardous Materials,2011,186(2):1766-1772.
[24]Tian Y,Gao B,Wang Y,et al.Deposition and transport of functionalized carbon nanotubes in water-saturated sand columns[J].Journal of Hazardous Materials,2012,213:265-272.
[25]Cheng T,Saiers J E.Colloid-facilitated transport of cesium in vadose-zone sediments:The importance of flow transients[J].Environmental Science&Technology,2010,44(19):7443-7449.
[26]Ranville J F,Chittleborough D J,Beckett R.Particle-size and element distributions of soil colloids[J].Soil Science Society of America Journal,2005,69(4):1173-1184.
[27]陈星欣,白冰,闫瑜龙,等.悬浮颗粒的浓度对其在饱和多孔介质中迁移和沉积特性的影响[J].岩土力学,2012,33(8):2343-2348.
[28]Zamani A,Maini B.Flow of dispersed particles through porous media-deep bed filtration[J].Journal of Petroleum Science and Engineering,2009,69(1):71-88.