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Home | About Us | eco credentials

Remaining mindful of the effect we have on our environment and local communities.

It is of the utmost importance to ParkAcre that we continue to do all we can to make a positive contribution to a cleaner, greener planet.

Powered by Biogas.

100% of our power needs are provided by an onsite Biogas partner.

Our partner Hemswell Biogas has sole purpose in the optimisation of Anaerobic Digestion Plants through management systems, biological support, emergency response and feedstock support.

Food waste enters site
Food waste arrives by truck at the waste reception building.
Food waste separated
Solid waste is chopped up and liquid waste is added to turn the material into a slurry. All plastics and packaging are removed by screens at this point. Liquid waste is pumped into a storage tank to be utilised as a diluent for the solid wastes.
Hydrolysis Tank
The liquefied waste is pumped into the first tank in the multi-stage process. The majority of the initial Anaerobic Digestion (AD) processes of Hydrolysis, Acidogenesis and Acetogenesis occurs here.
Pasteurisation
The water flows into pasteurisation tanks and is heated to 70°C for an hour to kill any bugs, using spare heat from the generators.
Anaerobic Digesters
Pasteurised feedstock enters the tank with gas being used through the mixing systems, which ensure a homogenous liquid. In here methanogenic archaea convert the calorific fraction of the feedstock into methane.
Combined Heat and Power units
The biogas produced from the process generally consists of 60% methane and 40% CO2. The gas is utilised as fuel by combined heat and power (CHP) engines, which produce electricity which is sent to the grid to power homes and industry across the UK.
Heat
The CHP units generate a substantial amount of heat, which we reuse in the pasteuristation process. In addition to this, we harvest more of the heat produced and utilise this through an Organic Ranking Cycle (ORC) turbine to produce more renewable electricity.
Bio-fertiliser
Once the liquid digestate has yielded its gas, this material is stored in lagoons to await being spread back to the land as a bio-fertiliser, replacing fossil fuel derived inorganic fertilisers. Our digestates are accredited for this purpose through the Biofertiliser Certification Scheme.

What is Anaerobic Digestion?

Anaerobic digestion is a complex biological process involving the breakdown of organic matter in the absence of air in large, sealed and insulated vessels with controlled heating and mixing.

To better understand this green technology step-through our biological process.

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