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Farm Building and Infrastructure
Renewable Energy
AD digestate storage/spreading costs
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<blockquote data-quote="thesilentone" data-source="post: 868140" data-attributes="member: 6194"><p>There appears to be some confusion here.</p><p></p><p>Digestate is the terminology used for the bi-product of AD. However the digestate can be managed in two ways: 1) A liquid (around 7% DM) or after separation as both a liquid (around 2.5% DM) and a dry fraction (around 25% DM) these depend on the separation equipment also (either screw press or centrifuge). Is is still digestate whether liquid or dry.</p><p></p><p>The issue over storage very much depends on the type of EA permit required:</p><p></p><p>The options are:</p><p></p><p>1) EA Permit exemption, this is for Ag plants using ag feed-stock, the only restriction is if NVZ regulations apply whereby the period of closed spreading time storage is required.</p><p>2) EA Standard permit, this applies where waste-feedstock is being used, it is a simply but inflexible permit. This has restrictions on the amount of dry fraction storage, as under this permit the dry fraction should be stored inside and usually requires some sort of Odour management.</p><p>3) EA Bespoke permit, This I can best describe as a site/area specific permit that takes into consideration design and local area considerations. This is time consuming and expensive but could be more flexible than a Standard permit.</p><p></p><p>The limit on storage is for the dry fraction on a standard or bespoke permit.</p><p></p><p>Finally, after separation you may have some settlement in the liquid storage tank or the lagoon IF no agitation is provided. In a storage tank it is usually one single submersible agitator. In a lagoon a whisk is used.</p><p></p><p>Hope this helps.</p></blockquote><p></p>
[QUOTE="thesilentone, post: 868140, member: 6194"] There appears to be some confusion here. Digestate is the terminology used for the bi-product of AD. However the digestate can be managed in two ways: 1) A liquid (around 7% DM) or after separation as both a liquid (around 2.5% DM) and a dry fraction (around 25% DM) these depend on the separation equipment also (either screw press or centrifuge). Is is still digestate whether liquid or dry. The issue over storage very much depends on the type of EA permit required: The options are: 1) EA Permit exemption, this is for Ag plants using ag feed-stock, the only restriction is if NVZ regulations apply whereby the period of closed spreading time storage is required. 2) EA Standard permit, this applies where waste-feedstock is being used, it is a simply but inflexible permit. This has restrictions on the amount of dry fraction storage, as under this permit the dry fraction should be stored inside and usually requires some sort of Odour management. 3) EA Bespoke permit, This I can best describe as a site/area specific permit that takes into consideration design and local area considerations. This is time consuming and expensive but could be more flexible than a Standard permit. The limit on storage is for the dry fraction on a standard or bespoke permit. Finally, after separation you may have some settlement in the liquid storage tank or the lagoon IF no agitation is provided. In a storage tank it is usually one single submersible agitator. In a lagoon a whisk is used. Hope this helps. [/QUOTE]
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AD digestate storage/spreading costs
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