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<blockquote data-quote="thesilentone" data-source="post: 3660450" data-attributes="member: 6194"><p>A couple of points, after a two stage digestion process, very little VS is left, PAS110 RBP test ensures almost 100% breakdown.</p><p>There should be no need to ' aerate ' in a storage tank, there is a need to agitate, however this is just to avoid separation and settlement. </p><p>At a waste plant all the filtration and capture of odorous air and gas cleaning is carried out long before final storage.</p><p>The final storage tank is usually not heated, so a low settlement temperature should occur, therefore no further fermentation.</p><p>I don't understand what you mean with your comment : <strong><em>A biofilter is actually no such thing</em></strong></p><p>At a waste plant, we have to deal with odour, that is a planning condition.</p><p>Cleaning gas is different, this can be done in several ways, one of which may be a biofiler (biological filter)</p><p>However, the same technical name is given to a filter for cleaning air - biofilter, these again come in many types depending on the levels of cleaning required.</p><p>Regarding your final comment, simple gas cleaning is usually inside a digestion tank where a combination of H2S eating bacteria (grown on a floating layer or slats, or nets etc) are only the first stage, this process includes the addition of oxygen (you term as aerate) after this the gas is still not clean enough to burn in a CHP, therefore some form of secondary cleaning is required. This secondary filter could be biological or active carbon etc.............</p><p></p></blockquote><p></p>
[QUOTE="thesilentone, post: 3660450, member: 6194"] A couple of points, after a two stage digestion process, very little VS is left, PAS110 RBP test ensures almost 100% breakdown. There should be no need to ' aerate ' in a storage tank, there is a need to agitate, however this is just to avoid separation and settlement. At a waste plant all the filtration and capture of odorous air and gas cleaning is carried out long before final storage. The final storage tank is usually not heated, so a low settlement temperature should occur, therefore no further fermentation. I don't understand what you mean with your comment : [B][I]A biofilter is actually no such thing[/I][/B] At a waste plant, we have to deal with odour, that is a planning condition. Cleaning gas is different, this can be done in several ways, one of which may be a biofiler (biological filter) However, the same technical name is given to a filter for cleaning air - biofilter, these again come in many types depending on the levels of cleaning required. Regarding your final comment, simple gas cleaning is usually inside a digestion tank where a combination of H2S eating bacteria (grown on a floating layer or slats, or nets etc) are only the first stage, this process includes the addition of oxygen (you term as aerate) after this the gas is still not clean enough to burn in a CHP, therefore some form of secondary cleaning is required. This secondary filter could be biological or active carbon etc............. [B][I][/I][/B] [/QUOTE]
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