供水厂排泥对土壤固磷及理化特性的影响研究_许晓毅

供水厂排泥对土壤固磷及理化特性的影响研究摘要:进行了城市供水厂排泥施用于花园土壤的试验研究。单因素对照试验结果表明,土壤施用污泥后,其渗流出水中溶解磷量降低,土壤的固磷作用增强。当污泥施加量为60t/hm2时,和对照组相比,渗流液中溶解磷浓度、土壤容重分别降低了37.3%和22.9%,含水率和孔隙率较对照组分别增加了81.7%和11.0%。正交试验得出了渗流液含磷量、土壤容重等考察因素与河沙、污泥施加量关系的一次回归方程。在同一时段,土壤含水率、土壤孔隙率与河沙、给水污泥施加量呈正相关,土壤容重与土壤性质以及给水污泥加入量呈负影响,并不同程度存在交互效应。给水污泥适度施用于土壤,对其结构与理化性质的改善明显。关键词:供水厂;排泥;污泥利用;土壤改良;土壤固磷中图分类号:TU991;X703文献标识码:A文章编号:!1009-2455(2007)02-0085-05Impactofwaterworkssludgeonphosphorus-fixationandphy-chemicalpropertiesofsoilXUXiao-yi,LUOGu-yuan,WEIWei,JITie-jun(KeyLaboratoryofMinistryofEducationfortheThreeGorgesReservoirRegion′sEco-Environment,ChongqingUniversity,Chongqing400045,China)Abstract:Experimentofcitywaterworkssludgeusedforgardensoilwasstudied,theresultsofthesingle-factorcomparisontestshowedthat,afterapplyingthesludge,thephosphorusinseepagewateroutofthesoildecreased,theeffectofthesoilonphosphorus-fixationwasenhanced.Whentheamountofappliedsludgewas60t/hm2,comparedwiththecontrolgroup,theconcentrationofdissolvedphosphorusintheseepagewaterandthesoilvolumeweightofthetestgroupdecreasedby37.3%and22.9%respectively,meanwhile,themoisturecontentandthesoilporosityincreasedby81.7%and11.0%respectively.Throughtheorthogonaltest,alinerregressionequationwhichdescribetherelationshipbetweensomeinvestigatingfactorssuchasphosphoruscontentoftheseepagewater,soilvolumeweightandtheamountoftheappliedriversandandsludgewasdeduced.Itwasindicatedthat,duringthesameperiodoftime,soilmoisturecontentandporosityhadpositivecorrelationwithamountofappliedriversandandsludge,however,soilvolumeweighthadnegativeeffectonsoilcharacteristicsandamountofappliedwaterworkssludge,besides,reciprocaleffectsappearindifferentdegrees.Itwasprovedthatsoilconstructerandphy-chemicalcharacteristicswereveryimprovedwhenwaterworkssludgewasproperlyused.Keywords:watersupplyplant;waterworkssludge;sludgeutilization;soilmodification;phosphorus-fixationofsoil许晓毅,罗固源,韦玮,季铁军(重庆大学三峡库区生态环境教育部重点试验室,重庆400045)随着我国城镇化进程的加快,城市(镇)供水厂的数量与规模日益增加,供水厂污泥的处置已成为环境污染防治领域的突出问题和面临的紧迫任务。与污水处理厂剩余污泥的特性不同,供水厂排泥主要由水源