Bellozanne Outfall Phase 2 completed to maintain Jersey’s wastewater infrastructure

The second phase of rehabilitation works on the Bellozanne Outfall has been completed two weeks ahead of schedule by utility infrastructure engineering specialists, Ipsum Group. The ongoing project is addressing key defects identified in one of Jersey’s main wastewater channels.

This phase of the project focused on restoring six pipe sections located between the Bellozanne Sewage Treatment Works and Beresford House, maintaining the continuity of wastewater services across the island. The defects were identified by earlier CCTV surveys carried out by the Government of Jersey.

The Bellozanne Outfall carries storm overflows, final effluent and surface water from the island’s central treatment facility to the long sea outfall in St Aubin’s Bay. The system can carry up to an impressive 1,150 litres per second during peak conditions.
CCTV surveys identified deterioration in several sections of the pipeline, including a 1,050mm concrete pipe, which required intervention to reduce the risk of structural failure. To allow rehabilitation of the pipeline while maintaining wastewater treatment operations, a temporary overpumping system was installed. The system was designed to manage flows from the Sewage Treatment Works as well as diverted stream water and surface runoff.

Four pumps were positioned within the wash water chamber, with flows routed through a three‑way manifold and temporary pipework placed across the Government of Jersey’s operational site. This setup maintained full island service continuity throughout the works. The system operated as planned, and no interruptions to wastewater treatment processes were reported during the rehabilitation period.

Part of the project was carried out beneath Government of Jersey office buildings and next to active operational areas, including workshops, recycling facilities, and vehicle yards, with no interruption to their daily operations.
The six targeted pipe sections were rehabilitated using innovative UV‑cured Saertex S+ liners, with liner thicknesses designed to repair fully deteriorated structural conditions. Preparatory works included robotic cutting to remove partially closed valves within former rising mains now used as part of the overflow system.

The project was completed two weeks earlier than initially scheduled. Due to the location of the outfall, running beneath occupied buildings and through a live operational area, trenchless lining was selected as the most effective method. Operations at the Bellozanne Sewage Treatment Works, First Tower Pumping Station, and the wider network continued throughout the project.

Paul Cleaver, Ipsum’s Technical & Innovation Director said: “Delivering this project meant working in a sensitive, high-activity area while keeping the island’s wastewater services running as normal. Our teams took that responsibility seriously, planning each stage carefully and staying closely connected with everyone working on site. We’re pleased that this approach allowed the rehabilitation to be completed smoothly and successfully, while maintaining continuity of service throughout”

A Government of Jersey spokesperson added: “The project is an excellent example of what can be achieved when the right specialist is chosen and allowed to deliver in their field of expertise. Combining resources and knowledge ensured a successful team delivery of a critical infrastructure project.”

The works were delivered through coordination between the main contractor, Government of Jersey teams, and specialist subcontractors including Pump Supplies and Brenwals. This collaborative approach supported decision‑making, risk management, and continuity of operational services during the programme.

Ipsum is a leading provider of critical utility infrastructure engineering services in the Power, Water, Infrastructure, Controls & Automation and Telecoms sectors. It works in partnership with customers across regulated and non-regulated environments to optimise asset performance, supporting the security and resilience of critical networks.