Alternative configurations for biological phosphorous removal – experience from the United States: PRESENTATION ONLY
Koodie, T.1, Shaw, A.1, Chan, T.2 and Steichen, M.2, 1Black & Veatch, UK, 2Black & Veatch, US
(free)
ABSTRACT
The ability to achieve low phosphorous consents without chemical dosing has inevitably promoted the consideration and implementation of biological-P removal solutions. Historically, traditional designs in the UK have incorporated an AO or A2O configuration. More recently in the US, observations have revealed that more reliable P removal could be achieved with alternative configurations. The aim of this paper is to is discuss the development of alternative configurations for Enhanced Biological Phosphorus Removal (EBPR) whereby different phosphate accumulating organisms (PAOs) are selected that play a bigger role in enabling a more reliable and sustainable biological phosphate removal system to be provided. The main conclusion is that conventional designs might have inadvertently selected for less efficient PAOs, while alternative configurations allowed for the growth of multiple PAO species which can ferment higher carbon forms and take up phosphorus under anoxic conditions. The presentation will provide case study examples and identify design and operating conditions that favour the growth of a multitude of PAOs.
