Digestate and Biofertilisers

The agricultural benefits of Compost and Digestate from the AD process are now widely recognised. All of Severn Trent Green Power's food waste and composting facilities produce environmentally friendly, premium quality, nutrient–rich compost and organic fertilisers.

We work closely with our farming partners to supply our biofertilisers at the times their crops and land are most in need of nutrients. We do this via our own fleet of tankers so that we can be sure the material remains at the same high quality as when it left our facilities, that it is moved safely and arrives within the timescales needed.

Our rich products help farmers improve the quality of the their soils whist reducing their reliance on petrochemical fertilisers which are costly to both the farm and the environment. Ultimately maximising the volume of crops they are able to grow.

Because all of the products we supply are derived from the food chain or garden waste sources, we are helping to reconnect the nutrients and close the loop between the growth and consumption of food, and the unavoidable waste that comes from this process.

We effectively return waste food to the ground it was grown in; we re-nourish the UK's soils so that the whole process can begin again.

In addition to renewable power, Digestate is the end product of our Anaerobic Digestion process. This product is a liquid rich in nitrogen, potash, phosphate and other trace elements that are highly valuable when returned to land as a biofertiliser.

Once a poorly understood and ‘novel’ material, various independent studies and field experiments have proven the agricultural benefits of Digestate. The results have provided Farmers with a robust evidence base and thus confidence in the use of Digestate as an organic alternative to petrochemical fertilisers.

Digestate is now widely used and Severn Trent Green Power's PAS110 certified product is highly regarded within the agricultural community.

In a study recently undertaken by WRAP (read the full report here), they found:

"Anaerobic digestate is a biofertiliser, providing crops with readily available nitrogen. It is an excellent alternative to bagged fertilisers. Using it improves the sustainability of farming by reducing emissions of greenhouse gases associated with fertiliser manufacture, and by reconnecting nutrient cycles."

Severn Trent Green Power's composting facilities produce a high quality Composted Soil Improver. This product is PAS 100 and Compost Quality Protocol certified and is ideal for application on agricultural land.

In most cases this product is supplied to the farm land in which our composting plants are situated. Thus providing our farming partners with a completely organic peat, additive and chemical free product which contains a range of beneficial nutrients that help increase soil health and fertility.

Being able to supply a high quality bio-fertiliser to our farmers, joining the closed loop circle of food waste back to the growth and production of more food, is of utmost importance to us.

Our ongoing achievement of the PAS110 industry recognised standard and quality protocol proves that the materials we produce are consistently high quality and meet all legal/moral criteria required to treat this as a new "product" rather than a "waste", this greatly simplifies the marketing and spreading of the digestate.

Severn Trent Green Power's AD facilities are all BSI PAS110 accredited or are working at the same standard whilst they undertake the certification process (during their commissioning phase).

BSI PAS110 is a voluntary national quality specification for biofertiliser, made available to AD operators throughout England, Wales and Scotland from February 2010, and forms part of the Anaerobic Digestion Quality Protocol.

WRAP organics specialist Nina Sweet said:

“The introduction of BSI PAS 110 is a fundamental step in helping to develop sustainable markets for biofertilisers. Making it easier for farmers to use biofertiliser will increase demand within the agricultural community for fertilising and soil conditioning products derived from waste material.”

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