24/09/2026
The first aeration lane of the ASP re-doming works at STW site in Buckinghamshire is finished and back in service.
The wider scheme covers two mirror-image ASP plants, each with two aeration lanes, and the replacement of 7,150 nine-inch fine bubble diffusers, with inspection of drop legs, manifolds and pipework. The existing diffusers were last replaced in 2015/2016 and had reached the end of their asset life, with failures showing up in recent inspections.
On Lane 1 our team has:
-Installed flow isolation boards to hold the lane dry and prevent effluent re-entry from the adjacent lanes, with over-pumping and filtration to the interstage pumping station during draining
-Cleaned out the lane and removed grit, rag and sludge arisings, using a grit plant to separate solids before disposal to licensed facilities
-Completed the 1,784 diffuser membrane replacement, with drop legs, manifolds and pipework inspected and made good as required
-Worked throughout under confined space controls, with scaffolded access and safe egress in place for the duration of the outage
-The lane was pattern tested. Air flow balancing was completed lane by lane.
Since commissioning on 28 July 2026, the refurbished lane has already removed:
- 79,832 kg of BOD
- 15,718 kg of ammonia (NHβ)
Restoring aeration performance on a live works takes careful sequencing around isolations, outages and everything else happening on site. Thanks to the site team for the coordination that made it possible. Attention now turns to the remaining lanes.
If you have ageing diffuser assets and want to talk through re-doming or drop-in grid options, get in touch:
π ATAC Solutions Ltd HQ
π» [email protected]
π² 01622 882400
π https://atacsolutions.com/contact-us/
π South West, UK - Michael Orchard
π» [email protected]
π² +44 787 377 7541
π https://atacsolutions.com/contact-us/
π North and Midlands, UK - ZoΓ« Matthews
π» [email protected]
π² +44 756 129 4821
π https://atacsolutions.com/contact-us/