Codsall STW is located near the village of Bilbrook to the North of Wolverhampton. The works treats a FFT of 82 l/s, and comprises two secondary treatment streams: activated sludge stream and trickling filter stream. The consent limits are: TSS 40 mg/l, BOD 20 mg/l, AmmN 5 mg/l.
In AMP6, under the Water Framework Directive (WFD), the site has to meet a new total phosphorus (TP) consent of 0.5 mg/l, and Fe of 4 mg/l. To achieve these new consent standards, Severn Trent’s main contractor MMB installed a new tertiary solids removal plant with chemical dosing and mixing/flocculation.
Technical and economic assessment by MMB was made on the basis of Total life expenditure (TOTEX).
The FilterClear® skid was fully assembled and hydraulically tested off-site at Bluewater Bio’s works. Once tested and signed off the skid was transported to site for installation on a flat concrete slab.
|Project Name:||Codsall STW|
|Client:||Severn Trent Water|
|Main Contractor:||Mott MacDonald Bentley|
|Project Scope:||Design, supply
• Innovation: Utilisation of FC vessel headspace for flocculation removing the need for costly mechanical flocculation and associated operational requirements.
• DfMA: Fully assembled and tested off-site at Bluewater Bio’s works significantly reducing site and overall project durations.
Scope of Works
Design, procurement, manufacture, installation and commissioning of Bluewater Bio’s proprietary FilterClear® 4v2040 plant. Fully automated and instrumented tertiary filtration system for Total Phosphorous removal for the works final effluent. MCC and cabling by main contractor.
Award to delivery to site – 12 weeks
Installation time – 2 weeks
Commissioning – 2 weeks
Client organisation: Severn Trent
Contact person: Kristian Roberts (Project Manager MMB)
Codsall STW Process Parameters
|FFT||7,085 m3/d (82 l/s)|
|Design Influent TSS conc.|
(incl. allowance for chemical dosing)
|29 mg/L (average)
40 mg/L (95%ile)
|Effluent TSS||5 mg/L (average)|
|Effluent TP target||0.5 mg/L|