Leaders in biogas technology, sustainable energy from renewable resources.

gi-biofuels - an overview. Climate change and high energy costs are the driving forces in our search for alternative sources of energy and our goal must be alternative sources of energy that do not further deplete the resources of our planet, in other words renewable energy. Recent rises in the cost of oil and gas mean that not only do we need to protect our planet we need to protect our pockets too! At gi-biofuels a subsidiary of Geothermal Industries we specialise in the latest Renewable Energy technology, not only biogas production we also lead the way in novel ways of heating the biogas production process including the recovery and storage of heat from waste water, namely Heat Energy Recovery And Storage (HERAS).

gi-biofuels Partnership Projects in Sweden

Is your community interested in producing Electricity from Biomass? We can design schemes for populations of 12 people up to 1.2 million people. For further information please fill in the form on our Contact Us page.

Are you a Biomass Producer? If you feel you are not getting the best deal from your current partner company please fill in the form on our Contact Us page.

Biogas Production. Organic material is collected from farms and factories and mixed with waste water to form an organically rich sludge (pictured below right). Organic material used for energy production is referred as biomass and can include crops specifically grown for energy production as well as organic waste and waste water (sewage waste). Biomass derived energy is becoming increasingly important and in the USA biomass derived electricity is predicted to become second only to hydroelectricity in the league table of electricity from renewable resources.

Biogas Production from Farm Waste

Biogas Production. Excess water is removed from the sludge in order to concentrate the biomass. The concentrated sludge is then heated and piped into enzymic hydrolysis tanks (pictured below) where biochemical breakdown of the biomass content of the sludge begins. The hydrolysed sludge is then passed through blast coolers (pictured right) because the post-hydrolysis temperature would be too high for the bacteria in the next phase. In cold weather the blast coolers might not be used because if the outside temperature is low enough the sludge will cool naturally.

Biogas Production - Sludge Hydrolysis

Biogas Production. The biogas (comprised mainly of methane) produced by the bacteria is extracted from the gas dome at the top of the digesters (the extraction pipe is pictured below on the outside of the digester tank)  and either used directly for on-site electricity generation or stored in Gas Holders for future use ( a gas holder is pictured right).

Biogas Production - Extraction of the Bio-Gas from a Sludge Digester


Biogas Production. Raw biogas cannot be sent to the gas grid because it contains many impurities so biogas is mainly used to generate electricity on the site where the biogas is produced. The resultant electricity can then be exported to the electricity grid and makes a significant contribution to government targets.for renewable energy.

The biogas is firstly heated by passing through heat exchangers where the gas is heated by waste heat from the engines that drive the generators that produce electricity. Heat exchange pipes are pictured on the right and in the same way radiators heat your home heat exchange pipes heat the biogas.

The heated biogas is then sent in pipes to the engines that drive the generators that produce the electricity. The engines and generators are housed in container units and because those units produce heat as well as electricity they are known as Combined Heat and Power Units (CHPs).

Two CHPs are pictured below and also further below pictured from a different angle.

Biogas Production, Combined Heat and Power Units
Partnership Projects. Working with partner companies throughout the UK., and in Sweden, India and Ireland our expertise will serve you every step of the way from initial idea through feasibility and planning to completion of your project.

gi-biofuels Partnership Projects in India


Biogas Production - Sludge Aeration


Biogas Production - Post Hydrolysis Sludge Cooling

Biogas Production. In the next phase the hydrolysed sludge from the hydrolysis tanks is fed into the belly of large digester tanks (as pictured below) where bacteria digest the biomass content of the sludge producing biogas as a by-product.The process is known as anaerobic digestion because air or more specifically oxygen is not required.

The anaerobic bacteria employed to digest the biomass are principally Escherichia coli, (better known as E.coli) of a type (strain) found in the human gut. The precise strain however and the operating temperatures of the digesters are closely guarded commercial secrets! The temperature inside the digesters is monitored from a Control Room (pictured bottom left) and regulated by heat exchange pipes that run inside the digesters.

Biogas Production - Sludge Entry to Digester


Biogas Production - Biogas storage in a Gas Holder.

Biogas Production. The heated biogas is used as fuel for the massive V8 engines of the Combined Heat and Power units (CHPs), examples of which are pictured left and below left. Each of the container units shown in the pictures houses one of those V8 engines. Also in each container is a generator which is driven by the engine to produce the electricity. The top pipe you see in the top picture carries hot water away from the engines to the heat exchangers that heat the biogas. The bottom pipe returns the water which is again heated by the engines. The whole process is of course continuous.

It's worthy of note that recent research by the European Environment Agency (EEA) has concluded the use of biomass to replace coal in electricity and heat production gives far greater reductions in Green House Gas (GHG) emissions at a far lower cost than producing and using biomass to replace diesel fuel in transport.

Biogas Production - biogas is used to power CHPs to produce electricity.

Biogas Production. Every stage of biogas and electricity production is monitored and controlled 24/7 from a Control Room (pictured below). Electricity produced by the CHPs is sent to a sub-station where the voltage is increased. From the sub-station the electricity is sent via underground cables to a high voltage pylon at the end of a branch of the electricity grid (pictured right).

In a fraction of a second that electricity finds its way via the grid to sub-stations all over the country where the voltage is decreased before the electricity is finally distributed to homes such as yours. In that way biogas may have helped to boil the water that made your coffee (or tea) this morning!

Biogas Production - every stage is monitored 24/7 from the Control Room
Biogas Production. Electricity Exported to the National Grid

Copyright of all photographs and images is owned by Geothermal Industries (UK) Limited and reproduction of any content for commercial purposes is forbidden by law. Use by schools, colleges or universities for educational purposes is permitted.