1 Background Next to former Vosper Thorneycroft site Area of - PowerPoint PPT Presentation

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Background ▪ Next to former Vosper Thorneycroft site ▪ Area of regeneration ▪ Built 1966 ▪ Compliance issues 2

Pre-existing layout Inlet Works LLPS PSTs Storm Tank FSTs Sludge Tank ASP 3

Site Issues • Main issues • How to achieve performance on constrained site • How to maintain performance on constrained site • How to be a good neighbour in revitalised area • Approach to answering these issues • Integrated team • Compliance planning • Stakeholder engagement

Process Drivers • New Total Nitrogen Permit • UWWTR - 15 mg/l Annual Average (70% Removal) • WRA - 15mg/l Annual Average • Adherence with existing Permit from Historic Limitation • FFT 427 l/s • Inlet Screen performance • Catchment Population Growth to 73000 pe • Historic Odour Nuisance - new limits set to 1.5 ouE/m3 at nearest property • Pre-requisite planning condition for regeneration and site 5

Process solution Crude Sewer BNR Storm Screen MBR LLPS UFS FOGG Plant Odour Control Scrubbers Sludge Tanks Inlet Screens Terminal PS Centrifuges Lamellas Storm Tank 6

Architectural Solution

Construction Sequence - 1 8

Construction Sequence - 2 9

Construction Sequence - 3 10

Construction Sequence - 4 11

Innovations 12

Membrane Technology 13

Membrane Technology UWWTR 24h composite samples (24 samples per year) • Hollow fibre ultrafiltration MBR. Air and chemicals BIOCHEMICAL OXYGEN CHEMICAL OXYGEN SOLIDS (SUSPENDED are used for cyclical cleaning of the filters. Date DEMAND DEMAND (LOW LEVEL) TOTAL NITROGEN AT 105C) (HOMOGENISED) (HOM) (HOMOGENISED) ▪ Pore sizes (0.03 µm) small enough to retain 11/07/2018 07:15 5.78 2. Bacteria & Viruses as well as solids. 20/07/2018 06:45 3.9 44.8 37.5 3.5 10/08/2018 06:45 6.3 43.9 49.7 3. • Treatment performance is already significantly 17/08/2018 06:32 3.69 38.1 31.8 2. outperforming the Permit Conditions 11/09/2018 06:46 3.22 33.2 18.3 2. 24/09/2018 10:15 1. 23.8 11.1 2.5 • ~5 mg/l BOD vs. Target 25 mg/l 05/10/2018 07:24 3.43 26.3 14.4 2. • 26/10/2018 09:01 2.46 23.2 13.9 2. ~5mg/l SS vs. Target 60 mg/l 13/11/2018 06:55 2.12 14.4 11.2 2. • ~15mg/l Nitrogen vs. Target 15 mg/l or 75% 27/11/2018 11:22 1. 7.34 9.85 2. removal 04/12/2018 12:25 2.15 11.8 13.4 2. 08/12/2018 07:42 2.52 11.6 13.1 2. • Nitrogen removal on target for meeting standards 13/12/2018 07:37 1. 19.7 17.7 2. once optimised following sludge plant commissioning 14

Summary ▪ Use of BNR and MBR at Woolston has enabled us to achieve high performance already before completion on very constrained site. ▪ Digital engineering / BIM key to success in planning complex temporary and permanent works. ▪ Without stakeholder support the project would have been unbuildable and vastly more expensive solutions would have been required. 15

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