Editing Biogas (section)

===European Union===
The European Union has legislation regarding waste management and landfill sites called the [[Landfill Directive]].

Countries such as the United Kingdom and Germany now have legislation in force that provides farmers with long-term revenue and energy security.<ref>{{Cite web|url=http://www.alfagy.com/index.php?option=com_content&view=article&id=77&Itemid=72 |archive-url=https://web.archive.org/web/20110707110323/http://www.alfagy.com/index.php?option=com_content&view=article&id=77&Itemid=72 |url-status=dead |archive-date=7 July 2011 |title=CHP {{pipe}} Combined Heat and Power {{pipe}} Cogeneration {{pipe}} Wood Biomass Gasified Co-generation {{pipe}} Energy Efficiency {{pipe}} Electricity Generation |publisher=Alfagy.com |access-date=21 February 2010}}</ref>

The EU mandates that internal combustion engines with biogas have ample gas pressure to optimize combustion, and within the European Union [[ATEX directive|ATEX]] centrifugal [[Fan (machine)|fan]] units built in accordance with the European directive [[ATEX directive|2014–34/EU]] (previously 94/9/EG) are obligatory. These centrifugal fan units, for example [[Combimac]], Meidinger AG or Witt & Sohn AG are suitable for use in [[ATEX directive|Zone 1 and 2]] .