10 Years Of Experiences Of An MBBR Process For Pos

10 Years Of Experiences Of An MBBR Process For Post-Denitrification10YEARSOFEXPERIENCESOFANMBBRPROCESSFORPOST-DENITRIFICATIONK.Täljemark,H.Aspegren,C.Gruvberger,N.Hanner,U.NybergandB.AnderssonMalmöWaterSE-20580MalmöSwedenABSTRACTProblemswitheutrophicationandalgaebloomsinitiatedtheneedforenhancednutrientremovalatEuropeanwastewatertreatmentplantsintheendoftheeighties.WhenupgradingthetwoWWTPsinMalmö,sitespecificupgradingconceptshadtobeconsideredbecauseoftheexistingplantstructures.Asphosphorusremovalalreadywasimplemented,theupgradingwasfocusedonenhancednitrogenremoval.Thekeyelementintheupgradingprocedurewastheretrofitwithanappropriatepost-denitrificationprocess.Anewlydevelopedconceptwithamovingbedbiologicalreactorprocesswasfoundtobecost-effective.PilotplanttestswithanMBBRprocessforpost-denitrificationwereperformedfordemonstrationpurposeandtogetsomeideasforproperdesigncriteria.Thelaterexperiencesfromthefull-scaleplantoperationshowedgoodagreementwiththeselecteddesigncriteriafromthepilotplant