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

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Pre-existing layout

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PSTs Inlet Works Storm Tank Sludge Tank ASP FSTs LLPS

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

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Process solution

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

Architectural Solution

Construction Sequence - 1

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Construction Sequence - 2

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Construction Sequence - 3

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Construction Sequence - 4

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Innovations

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Membrane Technology

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Membrane Technology

• Hollow fibre ultrafiltration MBR. Air and chemicals

are used for cyclical cleaning of the filters. ▪ Pore sizes (0.03 µm) small enough to retain Bacteria & Viruses as well as solids.

• Treatment performance is already significantly
• utperforming the Permit Conditions
• ~5 mg/l BOD vs. Target 25 mg/l
• ~5mg/l SS vs. Target 60 mg/l
• ~15mg/l Nitrogen vs. Target 15 mg/l or 75%

removal

• Nitrogen removal on target for meeting standards
• nce optimised following sludge plant

commissioning

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UWWTR 24h composite samples (24 samples per year)

Date

BIOCHEMICAL OXYGEN DEMAND (HOMOGENISED) CHEMICAL OXYGEN DEMAND (LOW LEVEL) (HOM) TOTAL NITROGEN SOLIDS (SUSPENDED AT 105C) (HOMOGENISED)

11/07/2018 07:15 5.78 2. 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. 17/08/2018 06:32 3.69 38.1 31.8 2. 11/09/2018 06:46 3.22 33.2 18.3 2. 24/09/2018 10:15 1. 23.8 11.1 2.5 05/10/2018 07:24 3.43 26.3 14.4 2. 26/10/2018 09:01 2.46 23.2 13.9 2. 13/11/2018 06:55 2.12 14.4 11.2 2. 27/11/2018 11:22 1. 7.34 9.85 2. 04/12/2018 12:25 2.15 11.8 13.4 2. 08/12/2018 07:42 2.52 11.6 13.1 2. 13/12/2018 07:37 1. 19.7 17.7 2.

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.

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