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...History of biogas technology europe germany the italian volta collected marsh gas and investigated its burning behavior avogadro identified methane ch propoff states that is produced under anaerobic conditions pasteur researched on from animal residues he proposed utilization horse litter to produce for street lighting first wastewater treatment plant in digester with heating facility german sewage feed into public supply system addition organic fat increase production research demonstrates dung one cow can give a hundred times more than feces urban inhabitant establishment working group installation larger agricultural nearly plants are built fed by mixed water low oil prices technical problems lead shutdown all but two after energy crisis increased promotion implementation ec federal departments listed or planned slurry increasingly used as liquid manure progress due guaranteed generated electricity optimizing mixture substrates use different purposes details foundation association f...