The raised storage silos allow de-watered sludge to be directly loaded into trucks.
The raised storage silos allow de-watered sludge to be directly loaded into trucks.

BioEnergy and bulk materials handling specialist Saxlund International, part of the Opcon energy and environmental group, has secured contracts from Barhale Trant Utilities to design and supply sludge cake truck loading silos for Southern Water waste water treatment works (WWTW) at Budds Farm in Havant and Millbrook near Southampton, UK.

The projects include the construction of raised storage silos, each with a capacity of 240 m3 and specially designed to allow de-watered sludge to be directly loaded into trucks below for transportation off site, as part of Southern Water’s thermal hydrolysis and AD programme.

Consistent discharge

The flat bottomed silos will incorporate Saxlund’s sliding frame technology aim to ensure consistent discharge of material as well as screw conveyors and integrated control systems. Installation for both sites is due to commence in April with commissioning completed during June.

“There is a growing trend for water companies to develop advanced digestion schemes to improve processing efficiency and turn sludge into energy and our systems are specifically designed for storing and discharging non free-flowing, difficult to handle material like this. They’ve been tried and tested in hundreds of installations across the UK and Europe. We understand the processes and risks and are confident we have one of the best solutions on the market,” says Matt Drew, managing director, Saxlund International.

Thermal hydrolysis system

Saxlund completed a series of water industry projects for Anglian Water in 2014 and is currently building a 454 m3 sludge cake process feed silo for KMI Plus on behalf of United Utilities, to supply an on-site thermal hydrolysis system at Leigh Wastewater Treatment Works, UK. 

The company's products handles difficult bulk solids including sewage sludge and alternative fuels and is sees growth across its core operating markets including water, cement, Energy from Waste and Combustion solutions such as CHP.