Leigh Hydrogen Peroxide Dosing Unit

This project involved Bethell repurposing an existing containerised hydrogen peroxide dosing unit from Fazakerly Wastewater Treatment Works (WwTW), to reconfigure its operational function and adapt the unit to its new required parameters, after reinstalling at Leigh WwTW. Bethell's civil engineering teams were engaged to provide all infrastructure work, along with full testing and commissioning of the repurposed unit.

Overview- Prior to the removal and installation of the dosing unit, Bethell's civil engineering team constructed a concrete hardstanding along with:

• A bundled area complete with road gullies.
• Sleeping policemen.
• A new bund outlet to existing site drainage.
• Bunded area drainage from the hardstanding.
• Ducting for power and alarms.
• New security fencing.
• New valve chamber.
• Improved access onto existing site road.

Works were undertaken in close liaison with United Utilities (UU) operational staff on waste water treatment works, which ensured minimal disruption to the daily operation of the plant. Once this phase of the work was complete, the hydrogen peroxide dosing unit was lifted into position, connected, tested and commissioned under Bethell's management. To complete the works, we installed a 3m high 358 security prison mesh fencing around the compound area.

We engaged with our specialist partner WES, who recalibrated the internals of the unit to suit the output requirements and dosing location at Leigh, due to Leigh WwTW's dosing regime differing significantly from the Fazakerly WwTW's.

Project outcome- This project was successfully delivered within a 7-week window with no records of incident or delay. Successful completion of the project came down to meticulous planning and a close collaboration with UU, which ensured that works could go ahead unhindered.