Powder blender testing

Jatropha seeds were obtained from a test plantation owned by the Vanilla Jatropha Development Foundation (VJDF), Nairobi, and their identity was confirmed at the Kenya National Herbarium, Nairobi. Decortication to remove the hard outer shells was done manually. The seeds were then washed with water to remove dust and mud, sim-dried for three days and reduced to powder using a blender. 

Plastic samples were pulverized with a blender and then mortar and pedestal. ASTM D6691-09 allows for testing of plastic products in the form of him, foam, powder, or fragments of molded product. According to ASTM, powder samples should have a mean particle size of less than 25 mm. Our powder samples had a mean particle size less than 25 mm based on visual observahons. CO2 biogas was measured with a PASCO detector with computer-controlled equipment as shown in Figure E.l. The samples are kept in an oven and held at 30°C for 26 weeks according to ASTM standards. 

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