2022 Volume 65 Pages 28-37
CO2 reduction by using biomass and recycling of waste plastic are urgent issues. In this paper, we investigated new pretreatment processes that convert biomass and waste plastic into high quality solid fuels that are easy to handle. First, it was shown that the pyrolysis of biomass with a metal compound can be produced to a valuable solid fuel dechlorinated and easy grindability. We proposed a new process, evaluated the energy and cost under the optimum conditions (NaOH 7 wt% added, 500°C), and clarified that it was an excellent process. Next, we established a method of adding pulverized coal to mixed waste plastic and heat-treating it at 340°C to produce a granular non-fused solid with excellent grindability, combustion characteristics, and safety. Thus, we have established two methods for regenerating wastes that is difficult to crush or handle as a high-quality solid raw material with easy handling.
