2006 Optimization of free ammonia concentration for nitrite accumulation.pdf

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1、BioprocessBiosystEng(2006)28:275–282DOI10.1007/s00449-005-0035-yORIGINALPAPERJinwookChungÆHojaeShimÆSeong-JunParkSeung-JinKimÆWookeunBaeOptimizationoffreeammoniaconcentrationfornitriteaccumulationinshortcutbiologicalnitrogenremovalprocessReceived:29August2005/Accepted:22November2005/

2、Publishedonline:12January2006ÓSpringer-Verlag2006AbstractAshortcutbiologicalnitrogenremoval(SBNR)Introductionutilizestheconceptofadirectconversionofammoniumtonitriteandthentonitrogengas.AsuccessfulSBNRThebiologicalnitrogenremovalprocessisoneoftherequiresaccumulationofnitriteinthesyst

3、emandinhi-mostcommonandrelativelycost-effectiveprocessesbitionoftheactivityofnitriteoxidizers.Ahighcon-usedtoremovenitrogenfromwastewater.Duringthiscentrationoffreeammonia(FA)inhibitsnitriteprocess,ammoniumisfirstoxidizedtonitratebyaerobicoxidizers,butunfortunatelydecreasestheammoniuma

4、utotrophicnitrifiersandthennitrateisreducedtoremovalrateaswell.Therefore,theoptimalrangeofFAnitrogengasbyheterotrophicdenitrifiersunderthean-concentrationisnecessarynotonlytostabilizenitriteoxiccondition.Thisprocess,however,possessessuchaccumulationbutalsotoachievemaximumammoniumintrin

5、sicshortcomingsas;(1)nitrificationreactionisremoval.InordertoderivesuchoptimalFAconcen-slowandrequiresarelativelylargeamountofoxygentrations,thespecificsubstrateutilizationratesofand(2)denitrificationreactionrequireslotsofexternalammoniumandnitriteoxidizersweremeasured.Thecarbonsource,f

6、requentlynotsufficientinwastewaters.optimalFAconcentrationrangeappearedtobe5–Theshortcutbiologicalnitrogenremoval(SBNR)10mg/Lfortheadaptedsludge.ThesimulatedresultsschemewhichnitrifiesammoniumtonitriteandthenfromthemodifiedinhibitionmodelexpressedbyFAandreducesnitritetonitrogengas[1–4]ma

7、yovercometheseammonium/nitriteconcentrationswereshownverydrawbacksbecauseitcantheoreticallysave25%ofsimilartotheexperimentalresults.oxygendemandneededfornitrificationandapproxi-mately40%ofcarbonsourcesneededfordenitrificationKeywordsFreeammonia(FA)ÆNitriteandcanreduce63%ofbiomassproduc

8、tion[5–9].ac