Project Description
Arley Sewage Treatment Works (STW) is a medium sized trickling filter works. In AMP7, under the Water Framework Directive (WFD), the site has to meet a new total phosphorus (TP) consent of 0.3 mg/l, and an Iron consent of 4 mg/l. To achieve these new consent standards, Severn Trent 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: | Arley STW |
| Client: | Severn Trent |
| Capacity: | 120 L/s |
| Main Contractor: | Galliford Try |
| Project Scope: | Design, supply & commission |
Project Highlights
- Off-site manufacture
- Consent of 0.3 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® 4V2550 plant. Fully automated and instrumented tertiary filtration system for Total Phosphorus removal.
Project Duration
FilterClear delivered: April 2022
Installation time ~ 2 weeks
Commissioning time ~ 2 weeks
Client Contact
Client organisation: Severn Trent
Arley STW Process Parameters
| Average flow | 17 l/s |
| Maximum flow | 120 l/s |
| Design Influent TSS conc. (incl. chemical solids) | 38 mg/L (average) 70 mg/L (98%ile) |
| Effluent TP consent | 0.3 mg/L (average) |
| Effluent Fe consent | 4 mg/L (95%ile) |
