Farm scale biogas plants & forum ::: Information on biogas

<body> Ihr Browser unterstützt keine Frames! <h1>danish farm scale biogas plants. The formation of biogas</h1> <br><h2></h2><br>The biogas process The formation of biogas is through the microbial decomposition of organic matter under anaerobic conditions. In nature, this is a naturally occurring process; this is for instance what happens in the rumen of a cow. A biogas plant is therefore comparable to a rumen and it has to be fed just like a rumen. The process is complicated and involves many different bacteria. Simplistically it can be schematically described as follows: <br><h3>RAW MATERIALS</h3><br> liquid manure/slurry, etc large molecules, e.g. cellulose <br><h3>FIRST PHASE</h3><br> Hydrolysis, enzymes from bacteria Small molecules, e.g. glucose <br><h3>SECOND PHASE</h3><br> Acidogenesis, acid-forming bacteria Alcohols, volatile acids Hydrogen, carbon dioxide, etc <br><h3>THIRD PHASE</h3><br> Methanogenesis, methane-forming bacteria <br><h3>BIOGAS</h3><br> Methane (c. 65%) Residue: Carbon dioxide (c. 35%) Undecomposed material Others (0-1%) inorganic material, etc <br><h2>Factors influencing the process</h2><br> The following conditions are important for the microbiological process: 1. Completely anaerobic conditions are the most important condition. 2. Temperature. 3. Acidity should be in the range pH 6.5-8, which is the range achieved in an efficiently run digester. 4. Substrate. 5. Carbon/nitrogen ratio. <br><h2>Important operational conditions</h2><br> The management of a biogas plant has to take into consideration certain conditions affecting the operation. 1. Dry matter content 2. St irring 3. Inoculation 4. Organic loading 5. Hydraulic retention time <br><h2>The use of degassed slurry from biogas plants as a fertilizer</h2><br> The use of degassed slurry as an agricultural fertilizer has many advantages. There are, however, also some disadvantages, but these can be countered relatively easily <br><h2>Danish Suppliers</h2><br> The summary below has been prepared by the Secretariat for Farm Biogas Plants and will be adjusted in keeping with developments. 1. Gosmer Biogas Plant: Korinth Agricultural College c/o Jens Pedersen, Gosmer Smede- og maskinforretning 8300 Odder Tel.: +45 86554024 <a href="http://www.gosmer-biogas.dk">www.gosmer-biogas.dk</a> Jens Pedersen has three plants in operation – at Enggården, Houmarken and at Korinth Agricultural College. He does not expect future plants to be standardised but to be tailored to local conditions, based on the same concept. For larger farms, the idea is to have two smaller plants rather than one large one. 2. BIO-Energisystem A/S Plant: Moutrup Jørgen Thomsen, Allan Flarup, Anders Bundgaard, Rørholtvej 86 9370 Hals. Tel.: +45 9825 4444 E-mail: JT@bioenergisystem.dk 3. Lundsby Bioenergi A/S Plant: Brandstrup Erik Lundsby Andersen Nørrevangen 18 9631 Gedsted Tel.: +45 98645700 E-mail: lundsby@industri.dk <a href="http://www.lundsby.dk">www.lundsby.dk</a> BIO-Energisystem A/S and Lundsby Bioenergi jointly have three plants in operation – at Risgård, Sjørup Svinefarm og Fårborggård. These are farm-scale plants consisting of a slurry tank with an impermeable cover, with a reactor built from concrete rings placed in the middle. The reactor operates in the mesophilic temperature range. The plant is delivered with a engineering section containing a gas boiler and CHP system. The companies are now working separately and since separating have supplied three and five plants, respectively. 4. Dansk Biogas A/S c/o George Aboagye-Mathiesen, Jegstrupvej 36 8361 Hasselager Tel.: +45 87386500 Fax: +45 87380555. E-mail: post@dkbiogas.com <a href="http://www.dkbiogas.com">www.dkbiogas.com</a> The supplier has several plants in operation. 5. Green Farm Energy A/S Plant: Over Løjstrup Torben Bonde Over Hadstensvej 84 8370 Hadsten Tel.: +45 70252755. E-mail: GFE@greenfarmenergy.dk <a href="http://www.greenfarmenergy.dk">www.greenfarmenergy.dk</a> Supplied the plant for the farm Over Løjstrup near Hadsten. Uses both slurry and solid manure. 6. DDH Contractors Plant: Rønge Hedeselskabet Sune Aagot Jens Juulsvej 18 8260 Viby J. E-mail: saa@hedeselskabet.dk <a href="http://www.hedeselskabet.dk">www.hedeselskabet.dk</a> Two plants in operation: Grøngas A/S and Rønge <br><h2>History of biogas</h2><br> <br><h2></h2><br> <br><h2></h2><br> <br><h3></h3><br> <p><a href="http://www.biogasinfo.org/energy02/html/biogas_dk_fr.html">Biogas i Danmark</a></p> <p><a href="http://www.biogasinfo.org/energy02/html/biogas_uk_fr.html">Biogas in english</a></p> <p><a href="http://www.biogasinfo.org/energy02/html/losseplads_fr.html">lodsepladsgas</a></p> <p><a href="http://www.biogasinfo.org/energy02/html/landfill_fr.html">landfill gas</a></p> <p><a href="http://www.biogasinfo.org/energy02/html/kontor_fr.html">Om energikontoret</a></p> <p><a href="http://www.biogasinfo.org/energy02/html/gaard_fr.html">Gårdbiogas </a></p> </body>