Various treatment processes for MSW using hydrothermal process principle have been
developed, but only a few of those are designed to obtain solid co-firing fuel and applied
commercially at present4, 5, 6. Tokyo Institute of Technology (Tokyo Tech) has been developing
an innovative hydrothermal treatment technology for converting high moisture content solid
wastes into dried uniform pulverized coal-like solid fuel using low energy consumption7, and the
commercial scale plant has already been working in Japan. It is to be noted that MSW in Japan
contains much plastic which contain chlorine originated from polyvinylchloride (PVC). Since
chlorine is known to promote clogging, corrosion and dioxin formation in the furnace or its
downstream, a chlorine removal process in the MSW treatment process is inevitable.