Domestic products (putrescibles materials) The putrescibles materials present a pretty interesting value potential. In weight, the organics materials represent about 35 % of town refuse and a little more than 30 % domestic waist. In the environnemental negative impact, they are the most responsible in the burry waist problems (biogas et lixivia). The most well known categories compost materials are : table waste green waste: - leafs - vegetables- garden and cuts waste wooden residue: - sawdust- branches and threes - bark mud : - paper industries - towns - septic hole farming residues : -manure - truss of staw agricultural waste Facts: Many compost technologies are used in Quebec: The open systems (batteries or windrows), static’s or turnover and les close systems (grain-storage - strainers). In 1998, more than 174,481 metric tones waste material got in the compost recycling way, but this quantity doesn’t include mud (septic hole, paper industries - purifying companies ) because they are note define as solid waste in the house and city product. (53 % IC &I 47 %)