The phosphorus removal process was studied in a bench-scale plant for a period of 300 days. The process was observed to depend greatly on two parameters: the amount of volatile fatty acid (VFA) taken up in the anaerobic stage and sludge age. For a given sludge age, phosphorus release versus VFA uptake in the anaerobic stage could be fitted to a straight line, while phosphorus uptake in the non-anaerobic stages fitted a logarithmic curve. Thus, phosphorus removal occurred within a limited VFA uptake range. The range width and the phosphorus removal capacity varied with sludge age.
Influence of sludge age on enhanced phosphorus removal in biological systems
M. A. Rodrigo, A. Seco, J. M. Penya-roja, J. Ferrer; Influence of sludge age on enhanced phosphorus removal in biological systems. Water Sci Technol 1 July 1996; 34 (1-2): 41–48. doi: https://doi.org/10.2166/wst.1996.0354
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