GCA begins process commissioning at Liverpool WwTW upgrade
Process commissioning of the £200M extension to United Utilities' (UU) Liverpool Wastewater Treatment Works has now been started by GCA, the Galliford Try, Costain and Atkins joint venture. When fully up and running next year, the facility will be capable of processing 4,750l/s of wastewater and help keep the River Mersey clean.
The extension, one of the largest AMP5 projects in the UK, has been built in the redundant Wellington Dock next to the existing wastewater treatment works in neighbouring Sandon Dock. It includes a new secondary treatment process: a 16-cell, two-storey, 21m-high sequencing batch reactor (SBR) plant - one of the UK’s first multi-storey CASS (Cyclic Activated Sludge System) SBRs.
Andy Fielding, GCA JV innovation champion for the Liverpool project, said commissioning is on programme and going well. "We started at the end of April and by 26th May six of 16 cells had been successfully commissioned and are now on a four-hour automatic cycle as planned. It’s been a very busy time getting everything ready for commissioning. Recently that’s included preparing the new high voltage switchgear and getting the electrical power connected to commission the SBR feed pumps and aeration blowers. We’ve also been testing the 2.2m diameter large bore pipe."
The challenge now, said Fielding, is getting the new SBR process established without affecting the existing works. "The target is to get all 16 cells process commissioned by the end of July.”
Robert Molloy, UU process engineer in the Liverpool WwTW's Engineering Department, added: “The process commissioning of the SBR has gone very well with effluent quality as good as expected at all times.”
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