Process for preparing biofuel based on sewerage sludge and biomass by aerobic fermentation

摘要

The method of preparing a biofuel with a calorific value of 10,000 to 14,000 MJ / kg by aerobic fermentation according to the invention consists in the fact that 20 to 60 wt. stabilized dewatered sludge sludge and / or digestate separation from biogas plants, mixed with absorbent biomass selected from the group consisting of wood chip, straw, hay, sawdust and green waste. The initial moisture of the composition is 55 to 65% by weight. and the C: N ratio is 1:25 to 35. The 3 to 4 week aerobic fermentation process, depending on climatic conditions, is initiated by aerobic microorganisms present in the sewage sludge and / or forced aeration in the biogas station digestate separation. Upon reaching a temperature reduction of 70 degC below 40 degC and humidity of 35-40 wt%. the mixture is ready for combustion.