| 摘要 |
A bioreactor having improved gas yield is specified, in which the necessary residence time of the biomass in the rotting vessel (2) is decreased. On fermentation of dry, that is to say non-pumpable, biomass, owing to the moisture present in the biomass, percolating juices, what is termed percolate, are formed and are taken off via a drainage system (22) and, if appropriate, is recirculated from the top onto the biomass to be fermented. It has now turned out that the biogas yield is significantly increased, in the region between 10% and 40%, when the resultant percolate is not taken off immediately via the drainage system, but is backed up in the rotting vessel up to a certain level. This is achieved in terms of the device in such a manner that the rotting vessel is designed so as to be liquid-tight, that is to say even the flap (14) for charging and unloading the rotting vessel has to be made in a liquid-tight manner, and also must be constructed in a correspondingly stable manner in order to withstand the resultant liquid pressure. By means of the combination of the existing percolate drainage system with a percolate control unit (30) it is possible to set the liquid level of the percolate in the biomass to be fermented and to control it in such a manner that the biogas production rate or the biogas yield is maximal. |
