UK utility Southern Water has invested in advanced phosphorus filtration technology after a successful trial at the Storrington wastewater treatment plant in Sussex. The decision came after the system demonstrated strong performance in removing phosphorus from treated wastewater and improving overall treatment efficiency.
The technology uses Flocell XFM20 filtration units, which were initially installed on a temporary basis in June 2025 to evaluate their effectiveness. Following the successful trial, Southern Water decided to purchase two units for permanent use at the facility.
Each filtration system contains modular filters capable of processing flows of up to 40 litres per second. The containerized units can be installed quickly without major civil engineering work, making them a practical solution for upgrading existing wastewater treatment infrastructure.
The new filtration technology enhances the plant’s tertiary treatment process, enabling the facility to consistently meet strict environmental standards. The Storrington plant currently operates with a phosphorus discharge limit of 0.5 mg per litre, while also maintaining compliance with limits for biological oxygen demand, suspended solids, iron, and ammonia.
Phosphorus removal has become increasingly important as water companies face tighter environmental regulations. Under the UK Environment Act 2021, utilities are required to significantly reduce phosphorus discharge from treated wastewater by 2038, pushing companies to adopt more efficient treatment technologies.
By investing in advanced filtration systems, Southern Water aims to improve water quality, support regulatory compliance, and protect rivers and aquatic ecosystems from excess nutrients.
