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<blockquote data-quote="sjt01" data-source="post: 7276607" data-attributes="member: 30726"><p>As it is mixed almost 50% with carbon dioxide, the fire extinguisher gas, it is quite difficult to burn at a farm AD. Sewage works tend to have a multi-stage process, where the CO2 comes off earlier and there is a much higher concentration of methane in the later stages. Also, if you are doing gas to grid, you purify it even further and add butane and propane.</p><p>On all AD sites, there should be risk assessments and suitable precautions. The bigger risk is hydrogen sulphide which just kills. We all wear monitors for H2S when working near the AD. This will also give indications of flammable gas escape.</p><p>The use of H2S monitors on farms should be compulsory when mixing slurry under slatted sheds, or similiar. It would save many deaths.</p></blockquote><p></p>
[QUOTE="sjt01, post: 7276607, member: 30726"] As it is mixed almost 50% with carbon dioxide, the fire extinguisher gas, it is quite difficult to burn at a farm AD. Sewage works tend to have a multi-stage process, where the CO2 comes off earlier and there is a much higher concentration of methane in the later stages. Also, if you are doing gas to grid, you purify it even further and add butane and propane. On all AD sites, there should be risk assessments and suitable precautions. The bigger risk is hydrogen sulphide which just kills. We all wear monitors for H2S when working near the AD. This will also give indications of flammable gas escape. The use of H2S monitors on farms should be compulsory when mixing slurry under slatted sheds, or similiar. It would save many deaths. [/QUOTE]
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