Project Description
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 |
| Capacity: | 100 L/s |
| Main Contractor: | Mott MacDonald Bentley |
| Project Scope: | Design, supply & commission |
Supplementary Information
• 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.
Project Duration
Award to delivery to site – 12 weeks
Installation time – 2 weeks
Commissioning – 2 weeks
Client Contact
Client organisation: Severn Trent
Contact person: Kristian Roberts (Project Manager MMB)
Codsall STW Process Parameters
| DWF | 4,000 m3/d |
| 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 |
