- Biogas sources
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.
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.
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.
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.
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.
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.