HOW TO BUILD A POLYETHYLENE BIOGAS PLANT

 STEPS TO INSTALL A BIODIGESTER FOR A RURAL FAMILY 


Step 1: Materials 

The recommended biodigester length for a small family is 10 meters. To install a biogas plant of this size, the materials listed below are needed: 
•  28 meters of natural polyethylene plastic, 1000 gauges, 1.5 meters width.
•  8 used buckets (~20 L) of the same size or 2 cement pipes, 1 meter length, 12 inches in diameter
•  1 PVC screw (male adapter),1 inch in diameter
•  1 PVC cap (female adapter) 1 inch in diameter
•  2 meters of transparent plastic hose of 1 ¼ inches in diameter
•  1 PVC "T", 1 inch in diameter.
•  2 - 90º PVC elbows, 1 inch in diameter
•  1 meter of pressure PVC pipe, 1 inch in diameter
•  1 flat PVC cap ,1 inch in diameter
•  2 round plastic or aluminum disks (20-15 centimeters in diameter with a central hole of 1 inch)
•  1 transparent plastic bottle - 1 gallon of capacity
•  3 used tires automobile tubes (rubber belts)
•  8 used plastic fertilizer sacks
•  1 galvanized metallic pipe, ½ inch in diameter 50 centimeters length
•  1 tube of PVC glue
•  1 steel wool
•  An automobile or motorcycle as source of exhaust
•  1 plastic hose to take exhaust from the car to the place where the biodigester will be installed

Step 2: Biodigester location  

Once all the materials are obtained, the biodigester location needs to be decided. The biodigester should be close to the animals, and it is also recommended to connect any human latrines to the biogas plant to
eliminate another source of pollution. Lastly, the location should be near the kitchen where the biogas will be
used.  Next, proceed to dig a grave in the ground. This grave is needed to protect the biodigester from any
damage (from wild and domestic animals) and to help to maintain an appropriate atmosphere for the production of biogas.   An inclined gutter should be dug at each end of the grave. It should be the same width as the cement pipes.  It is necessary that the floor of the grave is in no way sloped, or else, the system will not work. Also, the walls should be totally flat and free of stones or roots that can break the bag.  Dimensions for the grave are as

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Source : http://journeytoforever.org/biofuel_library/digeste.pdf



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