饱和性吸附无机活性磷天然泥沙解析_再吸附特征.docxVIP

饱和性吸附无机活性磷天然泥沙解析—再吸附特征孙士权，宋毅，赵刚，聂小保，谭万春，万俊力（长沙理工大学水利工程学院，湖南长沙410114）摘要：泥沙是水体中无机活性磷的主要载体。为研究东洞庭湖饱和性吸附无机活性磷的天然泥沙解析再吸附规律，采用室内模拟实验考察饱和性吸附无机活性磷的泥沙解析-再吸附影响因素与特征。结果表明：扰动状态下饱和性吸附无机活性磷的泥沙，其水相无机活性磷平衡浓度及解析无机活性磷速率均比静态大。扰动强度为220r/min时，饱和性吸附无机活性磷的泥沙水相无机活性磷平衡浓度是静态1.65倍，解析无机活性磷速率是静态6.46倍；扰动条件下饱和性吸附无机活性磷的泥沙在快速解析阶段，其解析无机活性磷速率与含沙量成正相关性；扰动状态下，饱和性吸附无机活性磷的泥沙再吸附无机活性磷过程符合Freundlich等温式，但随水体含沙量增大，其再吸附的平衡吸附量则呈下降趋势；扰动作用下，水体pH值显著影响饱和性吸附无机活性磷的泥沙解析过程。中性水体，解析量最小，降低或升高水体pH值，解析量均增大。关键词：饱和性吸附；无机活性磷；泥沙；解析再吸附中图分类号：X132文献标志码：Adoi：10.3969/j.issn.1003-6504.2014.12.007文章编号：1003-6504(2014)12-0031-05StudyonCharacteristicsofLakeSedimentwithSaturatedAdsorptionofInorganicReactivePhosphorus—DesorptionandRe-adsorbingSUNShiquan，SONGYi，ZHAOGang，NIEXiaobao，TANWanchun，WANJunli（InstituteofHydraulicEngineering，ChangshaUniversityofScienceandTechnology，Changsha410114，China）Abstract：Theobjectiveofthepaperistostudylakesedimentwhichisconsideredasamajorcarrierofinorganicreactivephosphorus，representedbymonopotassiumphosphatethatleadstoeutrophicationoflake.Characteristicsofmonopotassiumphosphatereleasingandre-adsorptionwereexperimentallystudiedwithsedimentsamplestakenfromEastDongtingLake，ontowhichsaturatedinorganicreactivephosphoruswasadsorbed,andlaboratorytestssimulatedthelawsofdesorptionandre-adsorbingofthesedimentandexperimentdemonstratedthatunderdisturbancecondition,theequilibriumconcentrationofinorganicreactivephosphorusanddesorptionrateinaqueousphaseweregreaterthanthoseinstaticstate；whenthedisturbanceintensitywasasbigas220r/min，theaqueousphaseequilibriumconcentrationofinorganicreactivephosphoruswas1.65timesthatinstaticstateandthedesorptionrate6.46timesthatinthestaticstate；andduringtherapiddesorptionstagewhenthesystembeingdisturbed，thedesorptionratewaspositivelycorrelatedwithsandcontentinthesystem.Asforthere-adsorptionofinorganicreactivephosphorusunderdisturbancestate，theresultsshoweditaccordedwiththeFreundlichisothermequation，yetassandcontentcontinuedtoincrease，there-adsorbingequilibriumamounttendedtodecline.Inaddition，p