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|
|Main Contractor:||Mott MacDonald Bentley|
|Project Scope:||Design, supply
• 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.
FilterClear® delivered: March 2021
Installation time ~ 2 weeks
Commissioning time ~ 2 weeks
Compliant by: April 2021
Client organisation: Severn Trent
Contact Person: Lewis McGregor
Wellesbourne STW Process Parameters
|Average Flow||1,752 m3/d|
|Maximum Flow||3,984 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 consent||0.4 mg/L (average)|
|Effluent Fe consent||4 mg/L (95%ile)|