Southern Water engaged Selwood and Siltbuster to support a programme of planned maintenance and repair works on key assets at the treatment works.
The challenge
- Extremely restricted site footprint, limiting plant placement and access.
- Complex hydraulic arrangement due to split assets and the off-site pumping station.
- High rag content within the wastewater stream.
- Elevated compliance risk associated with the site’s sensitive coastal location.
- Requirement to maintain full operational continuity throughout the works.
The solution
Due to the site constraints a single phase approach would not be sufficient, Selwood and Siltbuster agreed to deliver the works in two phases:
- Phase 1 – Establishment of a robust bypass solution to support immediate planned maintenance.
- Phase 2 – Optimisation and expansion of treatment capacity following site reconfiguration.
Phase 1 is currently underway.
During operations, exceptionally high rag loads highlighted the need for additional treatment capacity to ensure full compliance.
In response, Selwood and Siltbuster worked collaboratively with Southern Water to enhance system resilience by reconfiguring the modular treatment setup, repurposing available site space, and deploying additional HB50MR units.
The result
- Reduced environmental and compliance risk at a highly sensitive coastal location.
- Demonstrated the flexibility and scalability of modular treatment solutions in a constrained operational site.
- Maintained operational continuity throughout the planned works, minimising disruption to site operations.
- Successful bypass of ageing assets, enabling essential maintenance and repair works to proceed safely and efficiently.
- Established a clear pathway for enhanced treatment capacity during Phase 2 of the project.
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