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New AD digestate standard proposed

Anaerobic digestion (AD) markets could be boosted by changes to digestate quality standards, following a British Standards Institution (BSI) consultation.

The Anaerobic Digestion and Biogas Assocation (ADBA) said proposals to re-draft BSI’s PAS 110 standard on digestate would help shore up market confidence.

PAS 110 was developed by WRAP in conjunction with BSI. It covers all AD systems that accept source-segregated biowastes and sets controls on input materials and minimum quality standards of whole digestate, separated fibre and separated liquor.

The consultation outlines changes to requirements on potentially toxic elements, pasteurisation, physical contaminants and residual biogas potential.

According to the ADBA, the Environment Agency accepted the test for residual biogas potential had to be ‘refined’.  

ADBA chief executive Charlotte Morton said: “Digestate markets are vitally important to the future of the industry, and an end-of-waste standard helps give market confidence in the quality of digestate.

“This consultation gives the opportunity to make important changes to PAS 110, and I would encourage all operators and developers with an interest in waste-based AD to respond.”

David Fatscher, head of market development for sustainability at BSI, said: “In 2007 BSI was commissioned by WRAP to develop an industry-wide specification in the area of AD.

“BSI published PAS 110 on 12 February 2010. A revision has now been published.

“The purpose of this PAS is to remove the major barrier to the development of AD and its markets for digestion process outputs by creating an industry specification against which producers can verify that they are of consistent quality and fit for purpose.

“PAS 110, together with other supply and demand market development measures, should help to encourage more sustainable practices in this area.”

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