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Arley STW, Phosphorus Removal

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 flow17 l/s
Maximum flow120 l/s
Design Influent TSS conc.
(incl. chemical solids)
38 mg/L (average)
70 mg/L (98%ile)
Effluent TP consent0.3 mg/L (average)
Effluent Fe consent4 mg/L (95%ile)
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