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UNSTABLE NITRITE INHIBITION OF PHOSPHATE UPTAKE CAUSED BY AEROBIC NITRITE DENITRIFICATION OF PHOSPHATE-ACCUMULATING ORGANISMS

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Abstract:

Recently, nitrite has been recognized as one of the considerable inhibitors of biological phosphorus removal. In fact, there are several reports on inhibitory effect of nitrite. While, unfortunately the reported critical levels of nitrite widely spread. So the real effect of nitrite has not yet been well understood. In this study, several batch tests were conducted to obtain stable and quantitative relation between the size of nitrite exposure and the size of inhibition. Based on the report that Phosphate-Accumulating Organisms (PAOs) with higher anoxic phosphate uptake activity are relatively less sensitive to nitrite exposure, more than 20 types of the enriched PAOs with different anoxic PUA were cultivated for the batch experiments. Results indicate that the size of nitrite inhibition depends on anoxic activity (more precisely, aerobic nitrite denitrification activity) of PAOs.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864707787977389

Publication date: 2007-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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