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Effect of Influent Nitrogen Speciation on Organic Nitrogen Occurrence in Activated Sludge Process Effluents
The effect of influent nitrogen composition on organic nitrogen production in a sequencing batch reactor (SBR) activated sludge process was investigated. A laboratory‐scale SBR was fed with three different type synthetic wastewaters with varying nitrogen compositions (phase I = nitriloacetic acid + ammonium [NH4‐N], phase II = NH4‐N, and phase III = amino acid mixture + NH4‐N) was operated. The effluent contained approximately 1 to 2 mg N/L organic nitrogen, even though there was no organic nitrogen in influent. The effluent organic nitrogen increased to approximately 4 mg N/L when the influent composition was changed and then stabilized at <2 mg N/L. The maximum nitrifier growth rate constants (μN) were calculated as 0.91±0.10 to 1.14±0.08 day−1, 0.82 ±0.13 day−1, and 0.89±0.08 day−1 at 20°C for the three different influent compositions. The effluent colloidal organic nitrogen (CON) was negligible, suggesting that the effluent CON found in full‐scale plants may be the result of influent‐derived suspended matter.
Effect of Influent Nitrogen Speciation on Organic Nitrogen Occurrence in Activated Sludge Process Effluents
The effect of influent nitrogen composition on organic nitrogen production in a sequencing batch reactor (SBR) activated sludge process was investigated. A laboratory‐scale SBR was fed with three different type synthetic wastewaters with varying nitrogen compositions (phase I = nitriloacetic acid + ammonium [NH4‐N], phase II = NH4‐N, and phase III = amino acid mixture + NH4‐N) was operated. The effluent contained approximately 1 to 2 mg N/L organic nitrogen, even though there was no organic nitrogen in influent. The effluent organic nitrogen increased to approximately 4 mg N/L when the influent composition was changed and then stabilized at <2 mg N/L. The maximum nitrifier growth rate constants (μN) were calculated as 0.91±0.10 to 1.14±0.08 day−1, 0.82 ±0.13 day−1, and 0.89±0.08 day−1 at 20°C for the three different influent compositions. The effluent colloidal organic nitrogen (CON) was negligible, suggesting that the effluent CON found in full‐scale plants may be the result of influent‐derived suspended matter.
Effect of Influent Nitrogen Speciation on Organic Nitrogen Occurrence in Activated Sludge Process Effluents
Pagilla, K. (Autor:in) / Sattayatewa, C. (Autor:in) / Urgun‐Demirtas, M. (Autor:in) / Baek, S. (Autor:in)
Water Environment Research ; 83 ; 761-766
01.08.2011
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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