Biological Phophorus Removal: Study of the Main Parameters

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Abstract
The biological phosphorus removal phenomenon has been studied in a modified “Phoredox” type pilot plant. The interpretation of the results obtained was facilitated by batch tests on the sludge. The influence of the duration of anaerobiosis, the presence of nitrates and various organic substances in the anaerobic zone were thus studied successively. The results obtained tend to confirm the hypothesis that biological phosphorus removal is due primarily to the bacterial strain Acinetobacter. Microbiological examination of the sludge has revealed the presence of these bacteria and that of acidogenic bacteria producing volatile fatty acids promoting the growth of Acinetobacter. Pure culture tests have confirmed the possibility of a greater phosphorus storage capability of Acinetobacter.

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