OPTIMISING CHEMICAL DOSING TO MEET PHOSPHORUS CONSENTS IN YORKSHIRE WATER Or OPTIMISATION OF STWs WITH PHOSPHORUS CONSENTS

Proceedings

OPTIMISING CHEMICAL DOSING TO MEET PHOSPHORUS CONSENTS IN YORKSHIRE WATER Or OPTIMISATION OF STWs WITH PHOSPHORUS CONSENTS

Smyth, M.1 & Pilgrim, E2
1Suez Advanced Solutions UK Limited, trading as Aqua Enviro ; 2Yorkshire Water PLC
(free)

Abstract
Yorkshire Water installed 22 Phosphorus (P) removal schemes, with final effluent permits between 0.5 – 5 mg/l Total Phosphorus (TP) in AMP6. 15 of these Sewage Treatment Works (STW) received permits ≤ 1 mg/l TP.

AMP 7 will see around 80 new P permits for Yorkshire Water of which at least 60 will include chemical dosing installations ranging from simple single-stage to more complex two-stage dosing with tertiary solids capture. For the majority of the AMP6 STWs, Iron (III) metal salt was selected and where alkalinity was deemed a process risk, caustic dosing added. This paper describes operational experiences and modifications; looks at data from selected sites to provide an overview of the molar ratios of chemicals used compared to design; and predicts the levels of P that can be achieved via single- and two-stage dosing.

Challenges during commissioning, optimisation opportunities and the benefit of good mixing are discussed.

Keywords
Phosphorus removal, chemical dosing, optimisation.

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