塑料管材输配水过程中有机物释放规律研究
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2020-02-28 15:33:48
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中国环境科学2014,34(6):1478~1484ChinaEnvironmentalScience塑料管材输配水过程中有机物释放规律研究张玲,刘书明,胡洪营(清华大学环境学院,北京100084)摘要:研究了目前给水管网中常用的3种塑料管材,未增塑聚氯乙烯(uPVC),聚乙烯(PE)和无规共聚聚丙烯(PPR)管在输配水过程中有机物的释放规律.通过静态管段实验模拟给水管网中不同输配水状态,选取总有机碳(TOC)为综合评价指标,考察了不同塑料管材中有机物随时间的迁移释放特性,并分析了管材有机物释放对管网水中余氯消耗的影响.随着管材输配水次数的增加,uPVC管释放至水中的TOC浓度和TOC释放速率分别在O.03mg/L和0.041ag/(d·cm)以下,而PE管和PPR管在输配水过程中TOC的释放浓度和释放速率在初期最大『PE:0.19mg/L,0.25p,g/(d‘cm);PPR:0.07mg/L,0.091xg/(d’cm2)],且后期递减并趋于平稳[PE:O.03--0.08mg/L,0.05--0.10p,g/(d·cm);PPR:0.01~0.03mg/L,0.01,-0.04~g/(d·cm)].随着水力停留时间的增加,不同管材释放的有机物浓度持续升高.不同管材有机物的释放能力排序为:PE>PPR>uPVC.各管材的有机物释放特性直接影响管网水的余氯消耗特性,且管材的有机物释放量越多,管网水的余氯消耗越快.PE管的使用易引起水体有机污染问题.本研究明确了3种常用塑料管材的有机物释放规律,将进一步为与塑料管材安全性能评价相关的国家标准的修订提供理论依据.关键词:塑料管材:释放;总有机碳;余氯消耗:饮用水中图分类号:X832文献标识码:A文章编号:1000—6923(2014)06—1478—07Researchoforganiccompoundsmigrationfrompolymericpipes.ZHANGLing,LIUShu—ming’,HUHong-ying(SchoolofEnvironment,TsinghuaUniversity,Beijing100084,China).ChinaEnvironmentalScience,2014,34(6):1478~1484Abstract:Polymericpipes,suchasunplasticizedpolyvinylchloridepipe(uPVC),polypropylenerandompipe(PPR)andpolyethylenepipe(PE)areincreasinglyusedfordrinkingwaterdistributionnetworks.ThisworkwasdesignedtodeterminetheTOCmigrationcharacteristicsofthreetypesofpolymerpipes(uPVC,PEandPPR)intodrinkingwaterandinvestigatetheinfluenceofTOCmigrationonthechlorinedecayinwater.Migrationtestswerecarriedoutunderstagnantconditionswithdiferentmigrationtimestosimulatedrinkingwaterdistributioninpipes.ExperimentresultsshowedTOCreleasediferedsignificantlywithdiferentplasticmaterials.Withtheproceedingmigrationperiod,theamountTOCandTOCmigrationratefromuPVCpipekeptbelowO.03mg/Land0.04/(dcm),respectively.Moreover,bothPPRandPEpipesshowedaninitialmaximummigrationofTOC(0.19mg/LandO.251.tg/(d。cm)forPE;0.07mg/Land0.091xg/(d‘cm)forPPR),andthenadeclinetrendovermigrationperiodtoarelativesteadylevel(O.03~0.08mg/Land0.05~0.10~tg/(d’cm)forPE;0.01~0.03mg/Land0.01~0.04p.g/(d‘cm)forPPR).Duringlongmigrationtimes,TOCconcentrationsofdiferentpipematerialsincreasedovertime,i
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