资源描述：
《家庭灰水回用指南.pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、TECHNICALMEMORANDUMonGRAYWATERpreparedby:JamesCrook,Ph.D.,P.E.EnvironmentalEngineeringConsultantBoston,Massachusettswithtechnicalreviewby:AlanE.Rimer,Ph.D.,P.E.Black&VeatchCary,NorthCarolinafor:BLACK&VEATCHonbehalfof:CleanWaterCoalitionSouthernNevadaWaterAu
2、thority150N.StephanieStreet,Suite130100CityParkwayHenderson,Nevada89074LasVegas,Nevada8910613February2009ExecutiveSummaryWatersuppliesintheLasVegasValleyareaarebecominglimitedduetopotentialshortagesintheColoradoRivercombinedwithcontinuedpopulationgrowth,and
3、localagenciesareinterestedinevaluatingadditionalmeansofincreasingtheirwaterportfolio.Theyrecognizethattheuseofgraywatermaybeapotentialsourceofdecreasingthedemandonpotablesuppliesandcommissionedthistechnicalmemorandumtosummarizeavailableinformationonwaterqua
4、lity,healthconsiderations,regulatorystandards/guidelines,anduseofuntreatedgraywaterbyhomeownersforoutsideirrigationpurposes.Graywateriswastewaterwhichisnotexpectedtobegrosslycontaminatedbyfecesorurineandisgenerallydefinedasallwastewatergeneratedinahousehold
5、excepttoiletwastes.Thiscouldincludewaterfrombathtubs,showers,kitchenandbathroomsinks,clotheswashingmachines,laundrytubs,anddishwashers;however,kitchensinksanddishwatersusuallyarenotincorporatedintograywaterflowduetohighorganiccontentthatmaycauseoxygendeplet
6、ionandincreasedmicrobialactivityofthegraywaterandthepossibilitythatthewastewatermaycontainfoodbornepathogens.GraywateruseisincreasingintheUnitedStates,whereasmanyas7percentofhouseholdsreportsomeuseofgraywater;many,particularlyinruralareas,withoutobtainingre
7、gulatorypermitsorapproval.SomelargecitiessuchasLosAngeles,allowtheuseofgraywater,buttheextentofthepracticeinlargecitiesisnotwell-documentedintheliterature.Whilethemainreasonforimplementinggraywatersystemsistoreducetheoveralluseofpotablewater,atleastonestudy
8、determinedthathouseholdsthatimplementedgraywatersystemsforgardenirrigationactuallyincreasedtheirdomesticwaterconsumptionbyanaverageofmorethan45gallons/day.Untreatedgraywaterisusedforoutsideirrigationof
