| 摘要 |
<p>A process for the simultaneous production of biogas (CH4 and CO2) and fertilisers from organic wastes (biomass) is composed of the following steps: In a prefermenter (1) conversion of the biomass is carried out by acid-forming microorganisms to form lower organic acids, CO2 and H2. In a main fermenter (2), in which optimal growth conditions for thermophilic microorganisms prevail, these intermediate products are then essentially converted to form CH4 and CO2. Finally, complete exhaustive fermentation of the biomass is carried out in a secondary fermenter (3) at about 70 to 135 DEG C, both additional biogas and also fertiliser being formed. The residence times of the biomass in the individual fermenter vessels (1, 2, 3) are appropriately controlled with respect to optimal energy yield. To increase the operational reliability, the pH is continuously controlled. <IMAGE></p> |
