The Effect of Free Nitrous Acid on the Anaerobic Metabolism of Polyphosphate Accumulating Organisms (PAOs) and Glycogen Accumulating Organisms (GAOs)
Authors: Ye, Liu; Pijuan, Maite; Yuan, Zhiguo
Source: Proceedings of the Water Environment Federation, Nutrient Recovery and Management 2011 , pp. 18-30(13)
Publisher: Water Environment Federation
Abstract:Free Nitrous Acid (FNA), rather than nitrite, has recently been suggested to be the true inhibitor on the aerobic P–uptake of polyphosphate accumulating organisms (PAOs). Also, it has been demonstrated to have a stronger inhibitory effect on the aerobic PAO processes than on the aerobic metabolism of glycogen accumulating organisms (GAOs), competitors of PAOs in enhanced biological phosphorus removal (EBPR) systems. In this study, the effect of nitrite/FNA on the anaerobic metabolism of PAOs and GAOs is investigated, to further clarify how the presence of nitrite/FNA can affect the PAO/GAO competition. The results clearly show that the presence of FNA has a detrimental effect on the acetate uptake rate on both PAOs and GAOs, but this adverse effect is much stronger on PAOs. In PAOs, the P/C ratio increases substantially (250%–300% compared to the control) and glycogen degradation and PHA production to VFA uptake ratios decrease when increasing FNA levels. In contrast, the same ratios for GAOs remain constant or slightly increase towards the highest FNA concentration. These results indicate a stronger detrimental effect on the anaerobic PAO metabolism than on the anaerobic GAO metabolism at the same FNA level, providing a competitive advantage for GAOs when FNA is present.
Document Type: Research Article
Publication date: January 1, 2011
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