【英文标准名称】:StandardPracticeforCalculationandAdjustmentofSilica(SiO2)ScalingforReverseOsmosis
【原文标准名称】:为反向渗透标定二氧化硅的计算和校正的标准实施规程
【标准号】:ASTMD4993-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.08
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:fouling;reverseosmosis;scaling;silica;solubility;Brackishwater/brines;Concentration(ofelements);Reverseosmosis(RO)installations;Scalecontrol;Seawater(natural/synthetic);Silica;Silica(SiO2)scalingpropoerties
【摘要】:Inthedesignandoperationofreverseosmosisinstallations,itisimportanttopredicttheSiO2scalingpropertiesoftheconcentratestream.BecauseoftheincreaseintheconcentrationofSiO2andthechangeinpH,thescalingpropertyoftheconcentratestreamwillbequitedifferentfromthatofthefeedsolution.Thispracticepermitsthecalculationofthescalingpotentialfortheconcentratestreamfromthefeedwateranalysisandthereverseosmosisoperatingparameters.ScalingbySiO2willadverselyaffectthereverseosmosisperformance.Thispracticegivesvariousproceduresforthepreventionofscaling.Thepresenceofcertainmetals,forexample,Al+3,maysignificantlyalterthesolubilityofSiO2viaformationofinsolublemetalsilicates.Thispracticedoesnotaddressthisphenomena.1.1Thispracticecoversthecalculationandadjustmentofsilica(SiO2)fortheconcentratestreamofareverseosmosissystem.Thecalculationsareusedtodeterminetheneedforscalecontrolintheoperationanddesignofreverseosmosisinstallations.Thispracticeisapplicableforalltypesofreverseosmosisdevices(tubular,spiralwound,andhollowfiber).1.2Thispracticeisapplicabletobothbrackishwatersandseawaters.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P42
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】:英语