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Dyserth STW, Phosphorus Removal

Project Description

Dyserth Sewage Treatment Works (STW) is a medium sized trickling filter works. Under the Water Framework Directive (WFD), the site had 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, MMB (Welsh Water’s delivery partner) installed a FilterClear® plant with ferric dosing upstream of primary settlement. Provision was made for a 2nd point ferric dose into a static mixer upstream of the FilterClear® plant, but
this has not been necessary.
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.

Project Name:Dyserth STW
Client:Welsh Water
Capacity:29 L/s
Main Contractor:Mott MacDonald Bentley
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® 3V1260 plant. Fully automated and instrumented tertiary filtration system for total phosphorus removal.

Project Duration

FilterClear® delivered: Mar 2020
Installation time ~ 2 weeks
Commissioning time ~ 2 weeks
Compliant by: July 2020

Client Contact

Client organisation: Welsh Water

Contact person: Richard Matthews

Dyserth STW Process Parameters

Average Flow1,021 m3/d
Maximum Flow2,506 m3/d (29 l/s)
Design Influent TSS conc.
(incl. allowance for chemical dosing)
28 mg/L (average)
46 mg/L (98%ile)
Effluent TP consent0.5 mg/L (average)
Effluent Fe consent4 mg/L (95%ile)
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