复合生物反应器亚硝酸型同步硝化反硝化脱氮

ChineseJournalofChemicalEngineering，16(5)778—784(2008)NitrogenRemovalbySimultaneousNitrificationandDenitrificationv／aNitriteinaSequenceHybridBiologicalReactor+WANGJian／ong(王建龙)，(彭永臻)料，(王淑莹)(局承青1)PENGYongzhenWANGShuyingandGAOYongqingCollegeofEnvironmentalandEnergyEngineering，BeijingUniversityofTechnology，Bering100022，China1INTRODUCTIONBiologicalnitrification—denitrificationisthemostcommonlyusedprocessfornitrogenremovalfromwastewater．NitrificationistheautotrophicoxidationofNH：一N。firsttoNOi．Nandthen，toN0；一N，whereasdenitritlcationistheheterotrophicandanoxlcconversionofNOi．N，firsttoNOi．Nandthen，togaseousnitrogencompounds【1】．Therefore，twosepa—ratereactorsarerequiredtoprovidedillerentenVl-ronmentsforthetwokindsofbactena：nitritiersanddenitrifiers，suchasconventionalanoxic／oxicprocess．However,inrecentyears，thephenomenonofsimul—taneousnitrificationanddenitrificationfSND)hasbeendescribedforvarioussystemsf2，31．Suchproc—esseselimmatetheneedoItwoseparatereactors，thus，simplifythetreatmentsystem．Varioustypesoftreat—mentunitshavebeenproposedsofartorealizesuchasystem141．Someothernovelnitrogenremovalprocesseshavearisenduringthelastfewyears，suchasshort—cutnitrificationdenitrificationandanaerobicammoniumoxidation(ANAMMOX)【5-7】．Theshort—cutprocessisbasedonthefactthatnitriteisanintermediarycompoundinbothsteps：nitrificationanddenitrifica—tion．Thjsapproachleadstosavingsofoxygenduringnitrificationandareductionoforganiccarbonre·quirementduringdenitrification，whichreducesthecostsfornitrogenremoval．Investigationoftheshort．enednitrogenremovaJpathwayvianitriterevealed：f1)40％reductionofCODdemandduringdenitrification；(2)63％higherrateofdenitrification；(3)300％lowerbiomassyieldduringanaerobicgrowth；and(41noapparentnitritetoxicityeffectsforthemicroorganismsinthereactor【8，91．IfSNDisaccompaniedbythein—hibitionofnitriteoxidizedtonitrate，theoreticallyasavingoforganicenergYofupto40％couldbereal—ized【9】．Yooela1．【3】achievedtheSNDvianitritebycontrollingtheDOinanintermittently．．aeratedSUS．．pendedreactor．Gaoeta1．【