UTILIZATION OF SEQUENCING BATCH REACTORS FOR NITRIFICATION OF HIGH AMMONIUM STRENGTH ANAEROBIC DIGESTER SUPERNATANT AND FILTRATE TO OPTIMIZE PLANT NITROGEN REMOVAL
The Elkhart, Indiana publicly owned treatment works (POTW) faces increasingly stringent nitrogen discharge requirements under the National Pollution Discharge Elimination System (NPDES). It is desired that nitrogen removal levels be increased through utilizing the existing treatment units as much as possible to forgo the expense of constructing separate tertiary treatment units. Operating the activated sludge (AS) units in a manner to achieve both nitrification and denitrification is the goal. One technique is to denitrify the oxidized nitrogen, nitrite and nitrate, at the head of the plug flow AS units in anoxic zones. Ammonium would be oxidized in subsequent oxic zones in the AS units. Oxidized nitrogen would be supplied to the head of the AS units in two ways: (1) nitrogen oxidized at the end of the AS units would be returned from the final clarifiers through the recycle line through which the mixed liquor suspended solids (MLSS) are also returned to the head of the AS units and (2) by nitrifying the ammonia in the anaerobic digester supernatant and filter press filtrate sidestreams in a sequencing batch reactor (SBR) before sending these sidestreams to the head of the AS units. The digester sidestreams represent less than 1 percent of the flow but nearly 10 percent of the ammonium fed to the AS units.
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Document Type: Research Article
Publication date: 2000-01-01
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