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改良UCT分段进水深度脱氮除磷工艺反硝化动力学性能.docx

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改良UCT分段进水深度脱氮除磷工艺反硝化动力学性能 Introduction Withtheincreasingenvironmentalconcerns,theremovalofnitrogenandphosphorusfromwastewaterhasbecomeanimportantissue.UCT(UniversityofCapeTown)processisawidelyusedbiologicaltreatmentmethodformunicipalandindustrialwastewater.Inthisprocess,theinfluentisdividedintotwostages,namelyanoxicandaerobicstages,tofacilitatetheremovalofnitrogenandphosphorusbydifferentmicrobialcommunities.Theprocesshasprovedtobeeffectiveinreducingnitrogenandphosphoruslevelsinwastewater.However,theUCTprocessisknowntobeenergy-intensiveandhashighoperationalandmaintenancecosts.Therefore,thisstudyaimedtoinvestigatethekineticperformanceofanimprovedUCTprocessinanaerobicdenitrificationtoreducethenitrogenlevelsandalsotoexaminethephosphorusremovalefficiency. Methods Thestudywasconductedusingalab-scalesequencingbatchreactor(SBR)withaworkingvolumeof5L.Thereactorwasfedwithsyntheticwastewatercontainingammoniumnitrogen(NH4-N)andphosphate(PO4-P)ataninfluentconcentrationof20mg/L.Theprocesscomprisedtwostages,namelyanoxicandaerobic,withtheadditionofMethanolasacarbonsourcefortheanoxicstage.Theretentiontimeforeachstagewas4.5hours,whilethecompletecycletimewas9hours.Thereactorwasoperatedatfourdifferenttemperatures(15,20,25,and30°C)toinvestigatethetemperatureeffectonthekineticsoftheprocess.Additionally,thenitrogenandphosphorusremovalratesweremonitoredcontinuously. Results TheresultsshowedthattheimprovedUCTprocessachievedahighremovalrateofnitrogenandphosphorus.TheaverageNH4-Nremovalefficiencywasobservedtobe88.4%,whiletheaveragePO4-Premovalefficiencyrangedfrom61.7%to83.7%.Thehighestnitrogenandphosphorusremovalefficiencieswereobtainedatthetemperatureof25°C.Thedenitrificationrateincreasedasthetemperatureincreasedto25°C,whilethenitrateandnitriteconversionratesdecreasedwiththetemperatureabove25°C.Theactivityofdenitrifyingbacteriawasfoundtobethehighestatthetemperatureof25°C.Moreover,theratioofcarbon-to-nitrogen(C/N)wasfoundtohaveasignificanteffectonthenitrateandnitriteconversionrates.Theoptimal