Organic fertiliser

Gazasia’s waste-to-fuel process of anaerobic digestion produces a digestate that is a natural, nutrient-rich bio fertiliser suitable for both large-scale and domestic soil enrichment.

Primary Use: Soil Conditioner

In its solid form, the digestate is fibrous and consists of structural plant matter including lignin and cellulose as well as minerals such as phosphate and potash, and some bacteria. It has high moisture retention properties. For large-scale use, it can be transported in bulk before being re-watered and hosed onto agricultural land. The liquid remaining when the digestate has been de-watered is also suitable for use as an agricultural fertiliser.


Soil structure

Soils tend to become compacted over time which impedes root growth, decreasing the ability of plants to take up nutrients and water. Soil conditioners such as bio fertiliser will add texture to keep the soil loose.

Soil nutrients

For centuries man has been adding materials to poor soil to improve its ability to support healthy plant growth and maximise yield. Some materials, such as compost and peat, are still used extensively.

Waste-derived bio fertilisers are naturally rich in nitrogen and carbon as well as beneficial bacteria. They can also enhance the positive effect of nutrients such as calcium, magnesium and phosphorus that may already be present in the soil.

Water retention

The fibrous nature of bio fertilisers means they can be used to improve water retention in coarse, dry, sandy soils, as well as helping to protect against erosion.

Large scale uses

Landmark projects are being launched in the UK by WRAP to consider the use of bio fertilisers not only in agriculture, but also for land reclamation and recovery projects such as sports grounds and former industrial sites, where nutrients have been depleted.

Environmental benefits of waste derived bio fertilisers

  • Methane is produced and released into the atmosphere during the manufacture of many commercial composts and slurries. It is 23 times more toxic than greenhouse gases such as carbon dioxide (CO2).
  • Gazasia’s anaerobic digestion process emits less greenhouse gas compared to other processes commonly used in the production of compost, as the methane is collected and utilised to produce a carbon efficient renewable energy source.
  • Recent studies have indicated that production of bio fertilisers can save between 20 and 30kg of CO2 per cubic metre compared to other available composts (see WRAP – Waste & Resources Action Programme in the UK,
  • The process of anaerobic digestion naturally eradicates many weed seeds from the resultant digestate, resulting in a reduced need for herbicides.


Additional benefits

  • Research by the UK’s high-tech research and analytics institute, the Agri-Food and Biosciences Institute (AFBI), indicates that cattle are less likely to reject grass spread with bio fertiliser than grass spread with slurry.
  • Bio fertiliser smells less strongly than some other fertilisers and slurries.

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