DEVELOPMENT OF A COMBINED BAC AND BZ REACTOR FOR REMOVAL OF NITROGEN IN WASTE-WATER FROM SLUDGE DRYING PROCESS

A combined biological activated carbon (BAG) and biological zeolite (B Z) reactor is under development to remove organics and nitrogen from w astewater which contains both inhibitory organics to nitrification and high concentration of ammonium nitrogen. In this study, the combined BAC and BZ reactor was applied to treatment of scrubber-washed wastewa ter from sludge drying process. Successful treatment performance was a ccomplished by decreases in concentrations of the inhibitory organics (in BAC tank) and ammonium nitrogen (in BZ tank) occurred by both adso rption to the mediums and biological reaction. Appropriate nitrogen lo ading rate for fine and stable treatment was shown to be less than 7 m gNOx(.)-N .(gGAC . d)(-1) for denitrification in BAC tank and less tha n 4 mgNH(4)(+)-N-(gZeolite . d)(-1) for nitrification in BZ tank. DOC/ NOx(-)-N loading ratio to BAC tank is required to be more than 2.0 mgD OC .(mgNOx(-)-N)(-1) for successful denitrification. Copyright (C) 199 6 IAWQ.