biogas banner

Over 40 years’ experience in the design, manufacture and supply of modular bolted Glass-Fused-to-Steel storage and containment solutions for Anaerobic Digestion that gives significant benefits over other types of digester construction.

Anaerobic Digestion/Biogas

Permastore’s involvement in Anaerobic Digestion (AD) modular bolted storage and Containment Solutions exceeds 40 years, and the Company’s experience has expanded considerably over this time.

Glass-Fused-to-Steel  (GFtS) tanks are utilised for mesophilic digesters, thermophilic digesters, pasteurising digesters and Enhanced Enzymic Hydrolysis (EEH) digesters amongst various other processes and applications.

Specifically grown crops such as maize and crop residues from the production of  cane sugar and palm oil along with animal, municipal, commercial, and other industrial process waste are used as typical feedstocks for AD plants. Some of which, prior to the development of AD were either burnt or sent to landfill.

Increasingly combinations of waste streams are being processed along with co-digestion of municipal sludge effluent and farm waste such as animal manure or slurry to generate “green” renewable energy. In the industrial sector using AD to create biogas is a valuable process that utilises waste streams to create renewable energy.

biogas image three


Biogas produced from AD that has been cleaned can be introduced directly into the grid, or if it has not, it can be converted into electricity by generators used in conjunction with Combined Heat and Power (CHP) gas engines.  There is also the opportunity to generate heat energy in the form of hot water for example, for use in industrial process applications or for use in community heating networks.

At the end of the process the digested material can be considered for use as fertiliser, which adds an additional revenue stream for the owner of an AD plant.

The design of a Permastore modular bolted storage and containment solution  allows  flexibility to accommodate a variety of tank aspect ratios, process pressures and temperatures that suit different AD processes, designs, and applications.

GFtS gives a high degree of protection throughout an AD digester, especially in the highly aggressive gaseous zone.  Combining the inert characteristics of Permastore’s GFtS coatings with the strength of steel, the flexibility of modular construction gives significant benefits over other types of digester construction.

Permastore’s modular design of structures allows an owner of the containment solution to either increase or decrease the capacity of the structure at any time by adding or removing rings from the structure.

Permastore GFtS AD Digesters are also used for biogas storage when combined with a double membrane roof.

Case Studies