Method for manufacturing fertilizers

Abstract

To provide a method for manufacturing fertilizers that can quickly manufacture fertilizers that are easily spreadable while a simple and low-cost. The method for manufacturing fertilizers according to the present invention comprises a water content adjustment process for adjusting a water content to more than 8% and less than 65% by mixing organic sludge generated in a process of sewage treatment or wastewater treatment and biomass combustion ash, which is combustion ash of biomass, at a weight ratio of the organic sludge of more than 1 and less than 9 when the total weight of them is 10. Also, it is more preferable to adjust the water content to 22% to 43% by mixing the organic sludge and the biomass combustion ash at a weight ratio of the organic sludge of 3 to 6.