A sequencing batch reactor (SBR) was operated for enhanced biological phosphorus removal (EBPR) and dramatic differences in the P removing capabilities were obtained in different stages of the operation. At one stage extremely poor P removal occurred and it appeared that bacteria inhibiting P removal overwhelmed the reactor performance. Changes were made to the reactor operation and these led to the development of a sludge with high P removing capability. This latter sludge was analysed by fluorescent in situ hybridisation (FISH) using a probe specific for Acinetobacter. Very few cells were detected with this probe indicating that Acinetobacter played an insignificant role in the P removal occurring here. Analysis of the chemical transformations of three sludges supported the biochemical pathways proposed for EBPR and non-EBPR systems in biological models. A change in operation that led to the improved P removal performance included permitting the pH to rise in the anaerobic periods of the SBR cycle.
Characterisation of enhanced biological phosphorus removal activated sludges with dissimilar phosphorus removal performances
Philip L. Bond, Jürg Keller, Linda L. Blackall; Characterisation of enhanced biological phosphorus removal activated sludges with dissimilar phosphorus removal performances. Water Sci Technol 1 February 1998; 37 (4-5): 567–571. doi: https://doi.org/10.2166/wst.1998.0719
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