Composting and recovery of organic waste

Organic waste-to-energy systems proposed for composting and energy recovery are generally based on the following process:
The waste is deposited in a large cylinder, known as a stabilized bioreactor, the core element of the composting unit. In a pre-fermentation stage tube which is continuously rotated for three days at a temperature of 60°C, the organic parts of the waste are broken down, leaving only a small fraction of the initial waste. Metals, glass, inert material and plastics are then separated from the organic matter during a refining stage. This type of refuse, which represents less than 50% of the original waste entering the system, is then generally transferred as fuel to an energy recovery center. Before the start of a two-stage composting process, the fermentable waste is mixed with shredded green waste in order to help the circulation of air. For four to six weeks, this mixture is kept in fermentation tunnels where temperature, hygrometry and oxygen concentrations can be monitored and regulated. After being turned over, the mixture completes its aerobic decomposition phase in designated storage areas for a further three to four weeks. After sifting, the end product is then kept on a storage platform for several months before use.


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