Project Description
Yeovil Sewage Treatment Works (STW) is a large trickling filter site. In AMP7, under the Water Framework Directive (WFD), the site has to meet a new total phosphorus (TP) consent of 0.5 mg/l, and an Iron consent of 4 mg/l. To achieve these new consent standards, Wessex Water installed a 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’s works, before being transported to site for installation on a flat
concrete slab.
The site was commissioned with Ferric dosing for P removal, and the FilterClear performance demonstrated that the compliance can be achieved reliably.
| Project Name: | Yeovil Pen Mill |
| Client: | Wessex Water |
| Capacity: | 411 L/s |
| Main Contractor: | Aecom |
| Project Scope: | Design, supply & commission |
Project Highlights
- Off-site manufacture
- Consent of 0.5 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® 11V2800/S2 plant, with staggered backwash. The plant is fully automated and instrumented tertiary filtration system for TP removal..
Project Duration
FilterClear delivered: Nov 2023
Installation time ~ 20 weeks
Commissioning time ~ 4 weeks
Client Contact
Client organisation: Wessex Water
Contact person: Andrew Gulliford (Head of Technical)
Yeovil STW Process Parameters
| Average flow | 14,170 m3 /d |
| Maximum flow | 411 l/s |
| Design Influent TSS conc. (incl. chemical solids) | 47 mg/L (average) 60 mg/L (98%ile) |
| Effluent TP consent | 0.5 mg/L (average) |
| Effluent Fe consent | 4 mg/L (95%ile) |
