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.

April~May 12 Walpole site prep banner

From L to R: 1) Raising the original ground prior to construction. 2) Preparing the ground for the piling machine.

May 2012

May 12 Walpole banner

From L to R: 1) View of the cutter of the piling machine. 2) Initial concrete cover around installed concrete piles.

June 2012

June 12 Walpole banner
From L to R: 1) Installing piles and ground reinforcement. 2) Steel reinforcement for the rainwater and sequencing batch reactor feed tank.

July 2012

July 12 Walpole banner
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.
Joint Scrutiny Committee visit to Walpole in July 2012
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.
Councillors site visit to Walpole July 2012
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.

August 2012

Walpole 20.08.12
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.

October 2012

Walpole AD, October 2012
The food reception building being clad.
Walpole AD October 2012 banner
From L to R: 1) Final storage building. 2) Liquor treatment tank erection. 3) Installing feed conveyors

December 2012

Walpole AD plant, Dec 12 002
From L to R: 1) Pipe runs. 2) Air blower slab with Sequential Batch Reactor tank and recycled water tank in the background.
Walpole AD plant, Dec 12 002
From L to R: 1) Excavation of drainage pumping station. 2) Pasteurisation pumps and pipe work.
Walpole AD plant, Dec 12 003
From L to R: 1) Steel reinforcement for generator slab. 2) Excavation for slab drainage channel.

January 2013

Walpole AD plant, Jan 13 001
From L to R: 1) Slab foundations being poured. 2) Pasteurisation equipment.
Walpole AD plant, Jan 13 002
From L to R: 1) Shredder for grinding up the food waste. 2) Outside of the reception building.
Walpole AD plant, Jan 13 003
From L to R: 1) Ducting for odour control being installed. 2) View of site, near completed tank plant.
Walpole AD plant, Jan 13 004
From L to R: 1) View of site near. 2) Lining works prior to stone coverage.
Walpole AD plant, Jan 13 005
From L to R: 1) Lining works, which is covered by stones (in the event of leaks). 2) View of cladding of reception building.

March 2013

Walpole AD plant, March 13 001
From L to R: 1) New road to the AD site. 2) Fencing of AD boundary.
Walpole AD plant, March 13 002
From L to R: 1) Delivery of odour vent stacks. 2) Odour control plant being installed, (prevents smells leaving the building)
Walpole AD plant, March 13 003
From L to R: 1) Lining works to tank farm. 2) Reception building yard (for food waste).
Walpole AD plant, March 13 004
View over tank farm.
Walpole AD, winter 2012~13
Walpole AD, winter 2012~13
Walpole AD during construction, winter 2012~13
Walpole AD during construction, winter 2012~13

April 2013

 

May 13 Walpole banner 1

From L to R: 1) Gas bag being constructed. 2) Pipe-work to digester tank being completed.

 

May 13 Walpole banner 2

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.

 

May 13 Walpole banner 3

From L to R: 1) Stand-by boiler and flue in position. 2) View over the tank farm.

 

May 13 Walpole banner 4

From L to R: 1) Lagging of pipe-work. 2) Grading up and finishing external areas.

 

May 13 Walpole banner 5

From L to R: 1) Reception Hall delivery bays for food waste. 2) Digestate storage shed.

July 2013

 

Walpole AD Plant, July 13 001

From L to R: 1) Centrifuge platform. 2) Digestion and Sequencing Batch Reactor (SBR) tanks.

 

Walpole AD Plant, July 13 002

From L to R: 1) Odour control. 2) Pasteurisation plant and Hydrolysis buffer tank.

 

Walpole AD Plant, July 13 003

From L to R: 1) SBR and emergency shower. 2) SBR and gas holder.

 

Walpole AD Plant, July 13 004

From L to R: 1)Standby boiler, Pasteurisation plant and Gas holder. 2) Tank Farm.

 

Walpole AD Plant, July 13 005

From L to R: 1) Tank farm looking north. 2) Turbo dissolvers.


July 13 Walpole AD 01

Looking north, showing the digestion tank, effluent treatment tank and gas holder.

 

July 13 Walpole AD 02

View towards the south west, showing odour control units and rear of reception building.

 

July 13 Walpole AD 03

Looking south from the top of hydrolysis buffer tank, showing the gas holder, digestion tank, sequential batch reactor feed tank and recycled water tank.

 

July 13 Walpole AD 04

View south, showing the standby boiler and pasteurisation plant.

August 2013

"Seed sludge", Walpole AD, Aug 13

Introducing bacteria through “seed sludge” as part of the site commissioning process

Walpole AD, Aug 13, early visitors banner

Early visitors to the Walpole AD site

 

 

 

 

 

 


 

 

 

 

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