(JP9220083-A)      Plug flow, horizontal fermenter for the anaerobic fermentation of organic materials, is new. Between the inlet and outlet a stirrer and heater (2) are included for reaction temperature control. The fermenter vessel is in concrete, with the heater (2) embedded in its walls.    Also claimed is the method of fermenter construction, in which a steel shuttering is used, and the vessel is concreted in sections. The shutterings of individual sections are welded together. Connection fittings are integrated into the shuttering.    USE -   A fermenter is used for the digestion of e.g. sewage sludge, with gas production.    ADVANTAGE -   This fermenter is relatively compact, and easily installed. The device can be electrically heated, with the benefit of electronic control. The heaters are readily incorporated at low cost. In-situ construction in any required size is feasible. The concrete confers strength and protection from external influences, and may be fully or partly underground, where barriers against water and heat loss can be included. 1500 m3 capacity, and 20000 t per year are feasible.    The vessel has thermal inertia and some insulation properties, tending to buffer the temperature of the contents. The heating resembles proprietary floor heating, with low cost plastic sheathing. The electronic control and service structures may be an integral part of the vessel.    (EP770675-B1)      Plug flow, horizontal fermenter for the anaerobic fermentation of organic materials, is new. Between the inlet and outlet a stirrer and heater (2) are included for reaction temperature control. The fermenter vessel is in concrete, with the heater (2) embedded in its walls.    Also claimed is the method of fermenter construction, in which a steel shuttering is used, and the vessel is concreted in sections. The shutterings of individual sections are welded together. Connection fittings are integrated into the shuttering.    USE -   A fermenter is used for the digestion of e.g. sewage sludge, with gas production.    ADVANTAGE -   This fermenter is relatively compact, and easily installed. The device can be electrically heated, with the benefit of electronic control. The heaters are readily incorporated at low cost. In-situ construction in any required size is feasible. The concrete confers strength and protection from external influences, and may be fully or partly underground, where barriers against water and heat loss can be included. 1500 m3 capacity, and 20000 t per year are feasible.    The vessel has thermal inertia and some insulation properties, tending to buffer the temperature of the contents. The heating resembles proprietary floor heating, with low cost plastic sheathing. The electronic control and service structures may be an integral part of the vessel.