Abstract
The conventional enhanced biological phosphorus removal (EBPR) model suggests volatile fatty acids are needed to stimulate EBPR. This study tested whether raw primary sludge would stimulate EBPR by operating parallel laboratory sequencing batch EBPR bioreactors receiving real wastewater with different levels of particles removed. The particles were removed by sedimentation time to be consistent with conventional primary treatment. The COD to total phosphorus removal in the EBPR SBRs was consistently at about 63 mgCOD/mgP regardless of the particulate COD fraction in the influent. Leaving more primary sludge in the EBPR influent showed lower effluent phosphorus levels despite having similar levels of soluble chemical oxygen demand and volatile fatty acids. This is contrary to the conventional model and suggests reducing primary treatment may be a viable option for performing EBPR on carbon limited wastewater.
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