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Project
Bridgewater Canal Minewater Treatment
Client
The Coal Authority
Value
£2,900,000
Case Study

Bridgewater Canal Minewater Treatment

Project
Bridgewater Canal Minewater Treatment
Client
The Coal Authority
Value
£2,900,000
The Project

The scheme was designed to clean mine water discharge from the old mine works that flow into the Bridgewater Canal. The ochre rich deposits suppress aquatic flora and fauna and inhibit aquatic life in the canal, which made the scheme a high priority site for remediation by the Environment Agency.

Works consisted of the construction of a dam to allow raw mine water to be diverted, via a pumping station, to twin 315mm diameter pipes. The twin pipelines transfer raw mine water for a distance of approximately 1km from Worsley  Delph (a scheduled Ancient Monument) to the remote treatment site, which is located on former agricultural land to the west of the M60 motorway and adjacent to the canal.

The pipeline route involved major highway crossings, traffic management and negotiation of the M60 slip road, going under the Bridgewater Canal and running approximately 300 metres along a narrow canal towpath. Installation of the pipeline was carried out using several techniques. Whilst mainly open cut methods were used, in areas of limited or difficult access where ground permissions permitted, the latest trenchless technologies were adopted. These included directional drilling and auger boring operations.

At the treatment site the raw mine water enters an aeration cascade building, clad to look like a barn, before discharging into one of three settlement lagoons, which enables a substantial quantity of the settled iron contamination to be de-sludged as necessary. The remaining contaminated waters enter Stage 1 wetland ponds, which are planted with reeds and then through to Stage 2 wetland ponds, also planted with reeds.

After passing through the Stage 2 wetland ponds, the clean treated mine water is transferred via a network of drainage pipes and manholes into a pumping station, before being discharged back into the Bridgewater Canal.

This project was awarded the Green Organisation Green Apple National Bronze Award for Environmental Best Practice.

Green Apple Award Winner

 

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