| 摘要 |
<p>In a process for manufacturing a pasteurized substrate by biological decomposition of organic refuse, the refuse is introduced into a container where it is intimately mixed with air under constant stirring during a residence time in order to induce bacterial aerobic decomposition, and the end product is refined. The process of the invention is characterized by the following processing steps: a) The container (1) is half filled with a mixture of solid refuse to be decomposed. Liquid substances are then added, and at the same time air is supplied naturally by constant stirring of the mixed refuse. Stirring is continued for a first residence time of 2 to 3 hours. b) A quantity not greater than one-third of the weight of the mixed refuse of decanted clarified sludge at a temperature equal to that of the mixed refuse is added. A quantity of white lime equal to approximately 4 % of the weight of the clarified sludge, depending on the acid content of the mixed refuse, is added. Stirring is continued for a further residence time of 69 to 70 hours. An installation for carrying out the process, with a container for the refuse to be decomposed, including feed and discharge devices and screw conveyors for stirring the mixed refuse, comprises a parallelepipedal container (1) with a heptagonal profile in the shape of an inverted house roof with its ridge pole sunk in the ground and whose width (b) is greater than its length (l). The base of the container consists of two identical, obtuse-angled, mutually inclined half-bases (1.1, 1.2) the surface of which is shaped to match the screw conveyors (2). At least one screw conveyor (2) is arranged in the vicinity of the two sloping half-bases (1.1, 1.2) parallel to the latter.</p> |
