太湖竺山湾污染底泥环保疏浚深度的推算太湖竺山湾污染底泥环保疏浚深度的推算.pdf

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