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Wellesbourne STW, Phosphorus Removal

Project Description

Wellesbourne Sewage Treatment Works (STW) is a medium sized activated sludge plant (ASP). Under the Water Framework Directive (WFD), the site had to meet a new total phosphorus (TP) consent of 0.4 mg/l, and an iron consent of 4mg/l.
To achieve these new consent standards, MMB (Severn Trent’s delivery partner) installed a FilterClear® plant with 1st point ferric dosing upstream of primary settlement and a 2nd point ferric dose into a static mixer upstream
of the FilterClear® plant. The decision was based on a comprehensive whole life cost (WLC) assessment of various tertiary solids removal (TSR) plants.
The FilterClear® skid was assembled and hydraulically tested off-site at Bluewater Bio’s works, before being transported to site for installation on a flat concrete slab. The plant was designed to allow a 4th filter to be added in the future, as the flow is expected to increase.

Project Name:Wellesbourne STW
Client:Severn Trent Water
Capacity:46 L/s
Main Contractor:Mott MacDonald Bentley
Project Scope:Design, supply
& commission

Project Highlights

• Off-site manufacture

• Consent of 0.4 mg/l TP and 4 mg/l Fe

• Rapid installation and commissioning

• No separate flocculation tank needed

Scope of Works

Design, procurement, manufacture, installation and commissioning of Bluewater Bio’s proprietary FilterClear® 3V1840 plant. Fully automated and instrumented tertiary filtration system for total phosphorus removal.

Project Duration

FilterClear® delivered: March 2021
Installation time ~ 2 weeks
Commissioning time ~ 2 weeks
Compliant by: April 2021

Client Contact

Client organisation: Severn Trent

Contact Person: Lewis McGregor

Wellesbourne STW Process Parameters

Average Flow1,752 m3/d
Maximum Flow3,984 m3/d (46 l/s)
Design Influent TSS conc.
(incl. allowance for chemical dosing)
32 mg/L (average)
45 mg/L (98%ile)
Effluent TP consent0.4 mg/L (average)
Effluent Fe consent4 mg/L (95%ile)
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