Fremgangsmåde til separering af organisk affald

摘要

There is described a method for separating organic waste. In order to achieve an energy saving separation whereby useful nutritive salts and fertilizer products are formed, firstly, a separating of larger particles from the organic waste which preferably is manure, takes place. Thereafter, the manure is digested under the forming of gases. The digested waste is conducted to a degasser where volatile substances in the form of carbon dioxide and ammonia are removed simultaneously with the separation of nutritive salts for utilization. Thereafter an osmotic filtration of the liquid fraction is performed. A residual fraction from the osmotic filtration is conveyed back to an evaporation and concentration process in order to save energy. A concentration is performed whereby it becomes possible to separate nutritive salts and to remove a residual fraction of ammonia. The gases formed by the digestion are utilized in a power/heating plant and creates energy for the evaporation and concentration step. Residual energy from the concentration step is used for the degassing process.