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Published online 3 April 2006
Published in J Environ Qual 35:742-748 (2006)
DOI: 10.2134/jeq2005.0179
© 2006 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
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Behavior of an Aerated Submerged Fixed-Film Reactor (ASFFR) under Simultaneous Organic and Ammonium Loading

R. Nabizadeh* and A. Mesdaghinia

Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, P.O. Box 14155-6446, Tehran, Iran


Figure 1
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  		Fig. 1. Diagram of the aerated submerged fixed-film reactor (ASFFR) used in this study.

 

Figure 2
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  		Fig. 2. Effluent chemical oxygen demand (COD) and nitrate concentrations at the startup period: (A) system turned to batch, (B) intermittent flow started for 3 h d–1, and (C) continuous flow established.

 

Figure 3
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  		Fig. 3. Effluent chemical oxygen demand (COD) and nitrate concentrations for Run 2 (hydraulic retention time [HRT] = 8 h, influent COD = 500 mg L–1, NH4–N = 30 mg L–1).

 

Figure 4
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  		Fig. 4. Effluent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Run 3 (hydraulic retention time [HRT] = 8 h, influent COD = 750 mg L–1, NH4–N = 45 mg L–1).

 

Figure 5
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  		Fig. 5. Effluent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Run 4 (hydraulic retention time [HRT] = 8 h, influent COD = 1000 mg L–1, NH4–N = 60 mg L–1).

 

Figure 6
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  		Fig. 6. Effluent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Run 5 (hydraulic retention time [HRT] = 8 h, influent COD = 500 mg L–1, NH4–N = 30 mg L–1).

 

Figure 7
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  		Fig. 7. Influent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Runs 2 to 5.

 

Figure 8
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  		Fig. 8. Effluent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Run 6 (hydraulic retention time [HRT] = 6 h, influent COD = 500 mg L–1, NH4–N = 30 mg L–1).

 

Figure 9
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  		Fig. 9. Effluent chemical oxygen demand (COD), nitrate, and ammonium concentrations for Run 7 (hydraulic retention time [HRT] = 4 h, influent COD = 500 mg L–1, NH4–N = 30 mg L–1).

 




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