太湖竺山湾污染底泥环保疏浚深度的推算.pdfVIP

中国环境科学 2011，3l(6)：1013-1018 China Environmental Science 太湖竺山湾污染底泥环保疏浚深度的推算 王雯雯，姜 霞 ，王书航，金相灿 (中国环境科学研究院湖泊生态环境创新基地，北京 100012) 摘要：根据颜色、气味、粒径、黏稠度等理化指标，将太湖竺山湾柱状底泥样品由上至下依次分为氧化层(A)、污染层(B)、污染过渡上层 (C1)、污染过渡下层(c2)和健康层(D)．通过对底泥中氨氮、总磷、总氮和烧失量垂直分布规律的分析，结合柱状底泥各分层氮、磷吸附／解 吸实验，推算 出竺山湾污染底泥环保疏浚层及其深度l鲒果表明，底泥中氨氮、总磷、总氮和烧失量含量随深度的增加呈下降趋势．A层和B 层中污染物含量明显高于其他层；无机磷吸附／解吸平衡浓度随深度的增加而下降，在 c1层与C2层间出现拐点；而氨氮的吸附／解吸平衡浓 度变化趋势较复杂．结合上覆水中无机磷与氨氮浓度，推算出竺山湾底泥环保疏浚层次为cl层，疏浚平均深度为O．40～0．70m 关键词：垂直分布；吸附／解吸平衡浓度；环保疏浚深度 中图分类号：X524 文献标识码：A 文章编号：1000～6923(2011)06—101306 Calculationofenvironmentaldredgingdepth ofcontaminated sedimentsinZhushanBayofTaihu Lake．WANG weln—wen，JIANG Xia ,WANGShu—bang，JINXiang—can(ResearchCenterofLakeEco-environment，ChineseResearch AcademyofEnvironmentalSciences，Beijing100012，China)．ChinaEnvironmentalScience，2011,3l(6)：1013~1018 Abstract：Accordingtophysicalnadchemicalnidexesofsediment，suchascolor,odor,particlesizenadviscosity，column sedimentsofZhushanBayweredividedintooxidelayer(A)，pollutedlayer(B)，upperpollutedtransitionlayer(C1)，lower pollutedtransitionlayer(C2)andhealthymudlayer(D)fromtoptobottom．Tocalculatetheenvironmentaldredginglayer anddepthofZhushanBay,verticaldistributionsofammonianitrogen(NH4+-N)，totalphosphorus(TP)，totalnitrogen(TN) andlossofignition(LOI)werenaalyzed．Nitrogennadphosphorusadsorption／desorptionexperimentsabouteverylayer were also conducted．Concentrations ofNHa-N，T TN and LOIdecreased with depths，and concentrationsof contaminantsin layerA na d layerB were significna tly higherthan those in otherlayers．Adsorption／desorption equilibrium concentrationsofinorganicphosphours(IP)insedimentdecreasedwithdepths，nadthereWasaninflection pointbetweenC1layerna dC2layer．Chna gesofadsorption／desorptionequilibrium concentrationsofNH4+-N withdepths were complex．Combined with concentrationsofIP nadNHa 一N in overlying water,environmentaldredging (env·dredging)layerofZhushanBay waslayerC1andenv