A COMPOSTING PLANT FOR ORGANIC WASTE AND METHOD FOR COMPOSTING SUCH WASTE

摘要

A composting plant and method for composting organic waste such as household waste separated at the source, sludge, wood chippings, straw, farmyard manure. The plant comprises a sealed compartment with an inlet zone with a device for feeding in the waste which is advanced from a receiving and preprocessing plant through an airtight sluice device; a process zone with one or more devices preferably a texturing agitator (14) suspended in a runner (46) for advancing and aerating of the waste from the inlet zone and through the process zone to an outlet zone with devices (18) for discharging the composted waste from the compartment. The bottom of the process zone which is connected to a ventilating equipment (26, 30, 34) is designed in such a manner that an aeration takes place up through the waste heap preferably via a bottom layer of coarse organic material such as wood chippings. The ventilator equipment is arranged with fresh air intake and intake from the compartment for controlling the oxygen concentration and the temperature. In the plant a heat exchange system is arranged for extraction of the heat generated from the process air and for condensing the water from it for drying the compost. The process temperature is kept in the range of 55-62 DEG C and the optimum oxygen concentration for the putrefactive process is maintained. The residence time in the process zone is of the approximate duration 5 to 25 days.