The 10,500m³ Digestate (Process Residues and a valuable Fertiliser) Lagoon was constructed at the beginning of the year so we then had unimpeded access to the rest of the site. The Digestate is what is left after the process and as stated is a very valuable fertiliser which will be used to fertilise the 800 acres the farm owns and another 1,000 acres our neighbouring farm owns.
The site set-up started 31st March through to 4th April followed closely by the site clearance 7th to 11th April and I suppose the CH4 media section can be looked at for photographs of everything so far, but let me know if you need separately?
The site levels were reduced next and were completed by the end of May. During May and June the Bund Wall was commenced as was the Reception Building.
During May and June the Bund Wall was commenced as was the Reception Building.
At the end of June the 2 x 23m diameter Digesters bases were poured and they are now going through their 2 week curing period.
The weighbridge civil works will start at the end of July and be completed by early August in readiness for the weighbridge arriving.
At the end of June the 2 x 23m diameter Digesters bases were poured and they are now going through their 2 week curing period. the 48 x Precast Concrete Panels (per Digester) will arrive 17th July and construction of the Digesters will start immediately. The Concrete Panel steel wires will be tensioned, the joints filled and then a plinth will be created at the base of the panels which forms the leak detection system.
Stage 2 of the Concrete Bund walls will also take place during August for completion by the end of September.
The Reception Building will be completed by the middle of August followed by the installation of mixing and pasteurisation equipment. By the middle of August both Digesters should have been water/pressure tested. Once tested and confirmed sound the cladding will be installed followed by the mechanical installation of all heating pipes and mixing systems prior to the roofs being installed.
The Biofilter and negative pressure systems will be installed during August too. (The Biofilter fans will create a negative pressure within the Reception Building, ensuring no escape of fugitive odour omissions.
The Digester separator will be installed at the beginning of September. This effectively squeezes the liquid out of the Digestate sending the liquid to the lagoon and depositing the dry digestate separately for use as a soil conditioner at the farm.
The water and slurry buffer tanks will be installed within the concrete bund during the first week of October along with the pre & post pasteurisation buffer tanks. (4 x 60m³ tanks)
The food Depackaging equipment will be installed during October. (This will allow the site the flexibility to take packaged food waste and this unit will separate the plastics and other waste materials from the organics.) The Reception Building will be completely snagged by the end of October.
We will seed the Digesters with a blend of cattle slurry and Digestate from another Biogas Plant at the end of October as soon as all dry testing has been completed. This slurry and Digestate known as the Inoculate is what creates the environment of methane producing bugs and prepares the Digesters for first feeding of grass silage toward the end of November.
The plant will be biologically commissioned during November and early December followed by electric testing and our first export of electricity to the National Grid on Friday 12th December.
Performance testing will then be carried out from 12th December until 8th January 2015.