环境工程专业英语-unit-14教学文案.doc

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1、环境工程专业英语-unit-14精品文档3BiologicalWastewaterTreatmentApplicationofmicrobialdegradationandremovalofundesirableconstituentsinindustrialandmunicipalwastesisnotanewconcept.Itiscommonlyusedprocessforgeneralwastewatertreatmentactivitiesandhasbeenformanyyears.Astheawarenessofchemicalcontaminationofthe

2、environment,muchresearchonbiologicaldegradationoftoxicchemicalshasoccurred.Amongtherangeoftreatmenttechnologies,biologicaldegradationranksamongthemosteffective.Itsmanagementandapplicationisenhancedbythepotentialtoapplybiologicaltreatmentinsequencewithotherchemicalandthermalprocesses.Activate

3、dsludgeTheactivatedsludgeprocessisstypicaltypeofsuspendedgrowthbiologicaltreatmentsystemandprobablythemostwidelyusedbiologicalprocessforthetreatmentoforganicandindustrialwastewaters.However,itcanonlytreataqueousorganicwastestreamshavinglessthan1%suspendedsolidcontent,andcannottolerateshocklo

4、adingofconcentratedorganics.Therefore,thewastestreamenteringthisprocesswillusuallyhavepassedthroughapretreatmentprocesswhichincludesaclarifier(primaryclarifier)andanequalizationbasin.Theprimaryclarifierisusedforremovalofgrit,oilyandfattymaterialandgrosssolidmaterial,whiletheequalizationbasin

5、isusedtodampenwastewaterflowvariationsandtoprovidemoreuniformorganicloadingtotheactivatedsludgesystem.Activatedsludgeprocessareusedtotreatmunicipalandindustrialwastessincetheyareversatile,flexible,andcanbeusedtoproduceaneffluentofdesiredqualitybyvaryingprocessparameters.Theprocesswasso-named

6、becauseitproducesanactivemassofmicroorganismscapableofaerobicallystabilizingawaste.Manyversionsofthebasicprocessexistbutallarefundamentallysimilar.收集于网络，如有侵权请联系管理员删除精品文档Thetermactivatedsludgeisappliedtoboththeprocessandtothebiologicalsolidsinthetreatmentunit.Themixedliquorsuspendedsolidsorac

7、tivatedsludgecontainsavarietyofheterotrophicmicroorganismssuchasbacteria,protozoa,fungi,andlargermicroorganisms.Thepredominanceofaparticularmicrobialspeciesdependsuponthewastethatistreatedandthewayinwhichtheprocessisoperated.Theactivatedsludgeproce