Build new or retrofit: Project evaluation for an ASP face with oil, grease and phosphorous removal consents in England

Bassey, B.O. and Odigie, O.P. Coventry University. UK


A pocket activated sludge plant (ASP) in Atherstone, England, UK, treats combined wastewater for 10,500 heads; with effluent consent of 25/45/5 (BOD/SS/NH3). In November 2017, phosphorus limits will be added to the current consent. A proposed petrochemical plant and university sewer are to channel their effluents to the ASP. This study thus examines plant upgrade options for phosphorus removal and petrochemical wastewater treatment. A proposal for the retrofit of existing facilities to meet phosphorus, oil & grease removal and the existing consents, forms the nucleus of this paper. The modified University of Cape Town (UCT) and dissolved air floatation (DAF) methods were selected as the most appropriate design solutions to retrofit the ASP for phosphorus removal and oil and grease removal, respectively. Justification for design decisions, operational and economic efficiency considerations and the project delivery plan are equally presented. Lessons learnt would be useful for operators, contractors and consultants involved with similar projects around the globe.
Atherstone, DAF, design justification, modified UCT, oil and grease removal, pocket ASP, P removal, project costing

Introduction Dynamic human growth patterns have tremendously affected wastewater treatment requirements (Corcoran 2010), making considerations to expand or build new facilities a common phenomenon in the industry. Faced with stiffer regulatory requirements, a UK operator seeks to combat the increased challenges of wastewater management in Atherstone, Warwickshire County, England (Figure 1).

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