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  1. This study investigated the main factors influencing digester temperature and methods to reduce heat losses during the cold season in the subtropics. Four composite digesters (two insulated and two uninsulated) were buried underground to measure their internal temperature (C) at a depth of 140 cm...  
  2. 2001-01-10 This book shows biogas users on how to operate and maintain their biogas plant. The things to do are illustrated with many simple drawings. 34 pages, illustrated  

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