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Impact of Media Type and Various Operating Parameters on Nitrification in Polishing Biological Aerated Filters
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  • Journal title : Environmental Engineering Research
  • Volume 15, Issue 2,  2010, pp.79-84
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2010.15.2.079
 Title & Authors
Impact of Media Type and Various Operating Parameters on Nitrification in Polishing Biological Aerated Filters
Ha, Jeong-Hyub; Ong, Say-Kee; Surampalli, R.;
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Three biological aerated filters (BAFs) composed of a PVC pipe with a diameter of 75 mm were constructed and operated at a waste-water temperature at . The media used for each BAF were: 5-mm gravel; 5-mm lava rock; 12.5-mm diameter by 15-mm long plastic rings, all with a media depth of 1.7 m. The feedwater, which simulated the effluent of aerated lagoons, had influent soluble chemical oxygen demand (sCOD) and ammonia concentrations of approximately 50 and 25 mg/L, respectively. For a hydraulic retention time (HRT) of two hours without recirculation, ammonia percent removals were 98.5, 98.9, and 97.8%, for the gravel, lava rock, and plastic rings, respectively. By increasing the effluent recirculation from 100 to 200% for an HRT of one hour, respective ammonia removals improved from 90.1 to 96, 76.5 to 90, and 65.3 to 79.5% for gravel, lava rock, and plastic rings. Based on the ammonia and sCOD loadings for different HRTs, the estimated maximum ammonia loading was approximately 0.6 kg -day for the three BAFs of different media types. The zero-order biotransformation rates for the BAF with gravel were found to be higher than the lava rock and plastic ring media. The results ultimately showed that BAF can be used as an add-on system to aerated lagoons or as a secondary treatment unit to meet ammonia discharge limits.
Nitrification;Biological aerated filter;Recirculation;National Pollution Discharge Elimination System;
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