Update on the limit levels for physical contaminants in PAS 110 

This communication was sent out on 06/05/2014 to members of the REA Biogas, ORG and Biomass Groups regarding feedback on the proposal regarding the physical contaminant limit levels in the new PAS 110.
Following our proposal to the PAS 110 Steering Group regarding the setting of a new limit level for physical contaminants in the PAS 110 on 24th April, I am pleased to inform you that wide support to the new proposed limit level was received by both members of REA and members of the PAS 110 Steering Group. This means that final amendments with regards to the agreed new limit should now be made to the draft PAS 110, along with other editorial amends, in line with BSI’s drafting rules.  BSI expect the PAS 110 to be published by the end of May/start of June.
I have highlighted to BSI that, as per the latest version of the draft PAS 110 that was circulated to the Steering Group, the physical contaminant limit levels should be expressed in kg/tonne of fresh weight linked to the total nitrogen content of the digestate. These limit levels will now be recalculated on the basis of the newly agreed maximum physical contaminant loading rate of 9 kg/ha. This is a significant tightening up of the limit compared to what was initially proposed. Based on the data available from the BCS, these limits should be achievable by a high proportion of AD operators. Please note that PAS 110 is a baseline specification that allows digestate users to demand more stringent quality as and when required. 
Finally, I would like to take this opportunity to thank you very much for your support and the constructive feedback you have provided.
Should you need any information, please do not hesitate to contact Kiara.

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