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1、AAbsorption-Theholdingofasubstancewithinasolidbycohesiveorcapillaryforces.Accumulator-Apulsationdampenerinstalledonthesuctionand/ordischargelinesofpumps,generallyplungertype,tominimizepressuresurgesandprovideuniformityofflow.Accuracy-Theclosenessofagreementbetweenanobservedval
2、ueandanacceptedreferencevalue.Whereanacceptedreferencevalueisnotavailable,ameasureofthedegreeofconformityofavaluegeneratedbyaspecificproceduretotheassumedoracceptedtruevalue,andincludesbothprecisionandbias.Acetylation-Substitutionofanacetylradicalforanactivehydrogen.Specifical
3、ly,formationofcelluloseacetatefromcellulose.Acidity-Thequantitativecapacityofaqueousmediatoreactwithhydroxylions.ActivatedCarbon-Granulatedorpowderedactivatedcarbonusedtoremovetastes,odor,chlorine,chloramines,andsomeorganicsfromwater.Afamilyofcarbonaceoussubstancesmanufactured
4、byprocessesthatdevelopadsorptiveproperties.Adsorption-Theholdingofasubstanceontothesurfaceofasolidbychemicalsurfaceforces,withoutformingnewchemicalbonds.AerobicBacteria-Bacteriathatrequireoxygenforgrowth,seeBacteria,aerobes.Aggregate-Granularmaterialsuchassand,gravel,crushedst
5、one.AirScour-Distributingairovertheentirefilterareaatthebottomofafiltermediaflowingupwardtoimprovetheeffectivenessofbackwashingand/ortopermittheuseoflowerbackwashwaterflowrate.Algae-Anyofagroupofchieflyaquaticmonocellularplantswithchlorophylloftenmaskedbyabrownorredpigment.Alk
6、alinity-Thequantitativecapacityofaqueousmediatoreactwithhydrogenions."M"alkalinityisthatwhichwillreactwithacidasthepHofthesampleisreducedtothemethylorangeendpointabout4.5."P"alkalinityisthatwhichreactswithacidasthepHofthesampleisreducedtothephenolphthaleinendpointof8.3."M"isth
7、etotalalkalinitywhichisthesumofhydroxidepluscarbonateplusbicarbonatecontents;"P"includesallthehydroxylandhalfthecarbonatecontent.Alum-Aluminumsulfate,Al2(SO4)3XH2O(X=14-18),acoagulant.AmbientTemperature-Thetemperatureofthesurroundings,typically20o-25oC.Amorphous-Noncrystalline
8、,devoidofregularcohesivestructure.AnaerobicBacteria-Bacteriat
