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1
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 TankASP
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
outperforming 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
once optimised following sludge plant
commissioning
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UWWTR 24h composite samples (24 samples per year)
DateBIOCHEMICAL 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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