AD plant under construction
The following describes and shows progress in constructing Somerset’s new anaerobic digestion (AD) plant at Walpole near Bridgwater to be used to process all food waste collected by Somerset Waste Partnership.
March 2012 – Advanced ground raising works undertaken using recycled site stone where available.
April 2012 – Plant construction on site commences.
From L to R: 1) Raising the original ground prior to construction. 2) Preparing the ground for the piling machine.
From L to R: 1) View of the cutter of the piling machine. 2) Initial concrete cover around installed concrete piles.
From L to R: 1) Installing piles and ground reinforcement. 2) Steel reinforcement for the rainwater and sequencing batch reactor feed tank.
- From L to R: 1) Buffer tank, erection of first steel ring. 2) Rainwater tank, swab testing for flaws. 3) Reception building ring beam reinforcement.
- Members of the SWP Joint Scrutiny Committee visit the site. From L to R: Cllr Alan Wedderkopp (Taunton Deane Borough Council), Cllr Richard Lillis (West Somerset Council), Cllr Paul Maxwell (South Somerset District Council) and Cllr Nick Cottle (Mendip District Council). Behind is the roof of one of the storage tanks which will hold pulped food waste prior to entering the anaerobic digestion process. The giant cylinder is built starting from the roof which is jacked up as rings are added below.
- The other end of the site, near the food waste reception hall. The foundations of most of the buildings and tanks have been laid and construction of three tanks underway. Despite challenges caused by the wet summer during the early phases of building, the project remains on schedule for completion by spring 2013.
- From L to R: 1). Water and waste water storage tanks with reception building behind. 2) Starting the digester tank. 3) Starting the reception building steelwork.
- The food reception building being clad.
- From L to R: 1) Final storage building. 2) Liquor treatment tank erection. 3) Installing feed conveyors
- From L to R: 1) Pipe runs. 2) Air blower slab with Sequential Batch Reactor tank and recycled water tank in the background.
- From L to R: 1) Excavation of drainage pumping station. 2) Pasteurisation pumps and pipe work.
- From L to R: 1) Steel reinforcement for generator slab. 2) Excavation for slab drainage channel.
- From L to R: 1) Slab foundations being poured. 2) Pasteurisation equipment.
- From L to R: 1) Shredder for grinding up the food waste. 2) Outside of the reception building.
- From L to R: 1) Ducting for odour control being installed. 2) View of site, near completed tank plant.
- From L to R: 1) View of site near. 2) Lining works prior to stone coverage.
- From L to R: 1) Lining works, which is covered by stones (in the event of leaks). 2) View of cladding of reception building.
- From L to R: 1) New road to the AD site. 2) Fencing of AD boundary.
- From L to R: 1) Delivery of odour vent stacks. 2) Odour control plant being installed, (prevents smells leaving the building)
- From L to R: 1) Lining works to tank farm. 2) Reception building yard (for food waste).
- View over tank farm.
- Walpole AD, winter 2012~13
- Walpole AD during construction, winter 2012~13
From L to R: 1) Gas bag being constructed. 2) Pipe-work to digester tank being completed.
From L to R: 1) Tank farm stone being graded to finish level to form the access road. 2) Odour control plant to the right, and adjourning pipe-work to and from the reception building.
From L to R: 1) Stand-by boiler and flue in position. 2) View over the tank farm.
From L to R: 1) Lagging of pipe-work. 2) Grading up and finishing external areas.
From L to R: 1) Reception Hall delivery bays for food waste. 2) Digestate storage shed.
From L to R: 1) Centrifuge platform. 2) Digestion and Sequencing Batch Reactor (SBR) tanks.
From L to R: 1) Odour control. 2) Pasteurisation plant and Hydrolysis buffer tank.
From L to R: 1) SBR and emergency shower. 2) SBR and gas holder.
From L to R: 1)Standby boiler, Pasteurisation plant and Gas holder. 2) Tank Farm.
From L to R: 1) Tank farm looking north. 2) Turbo dissolvers.
Looking north, showing the digestion tank, effluent treatment tank and gas holder.
View towards the south west, showing odour control units and rear of reception building.
Looking south from the top of hydrolysis buffer tank, showing the gas holder, digestion tank, sequential batch reactor feed tank and recycled water tank.
View south, showing the standby boiler and pasteurisation plant.
Introducing bacteria through “seed sludge” as part of the site commissioning process
Early visitors to the Walpole AD site