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Nitrogen removal from low carbon-to-nitrogen wastewater in four-stage biological aerated filter system
Ist Teil von
Process biochemistry (1991), 2008-07, Vol.43 (7), p.729-735
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2008
Quelle
Access via ScienceDirect (Elsevier)
Beschreibungen/Notizen
In this study, a four-stage biological aerated filter (BAF) system was proposed for the enhancement of nitrogen removal in the treatment of low carbon-to-nitrogen ratio (C/N ratio) municipal wastewater. Laboratory experiments were conducted at two different hydraulic retention times (HRTs), i.e., 3
h and 6
h. Results of the long-term operation of the BAF system showed that its overall NH
4-N removal performance was stable with the removal efficiency of 95–96% on average, regardless of HRT applied. The effectiveness of the proposed BAF was observed in denitrification performance. At the total chemical oxygen demand (TCOD) to total kjeldahl nitrogen (TKN) ratio of 3:6, the effluent NO
3-N concentration of denitrification column was 2.7
mg/L. It was concluded that the four-stage BAF system proposed in this study was excellent in nitrogen removal performance by employing four-column functioning as sorption, nitrification, denitrification and purification, respectively.