Thermal Separation of Heavy Metals with Low boiling Points and Decomposition of Dioxins in MSWI Ash by Melting Process

摘要

In Japan melting furnace technology is vigorously being studied as the technology to stabilize, reduce, and recycle incineration residue generated in connection with waste incineration. By generating a reducing atmosphere within a melting furnace, the melting technology not only improves the separation efficiency of heavy metals with low boiling points, which can consequently inhibit the transfer of those metals to the molten slag, but also reduces the generation of HCl and NOx to approximately half the standard levels. At the same time this technology gains an extremely efficient decomposition rate of 99 percent or more of dioxins contained in incineration residue, drastically reducing the load on the environment caused by dioxins in incineration residue. Furthermore, no increase in dioxin generation is found even when plastic wastes are mixed with the incineration residue for melting. This indicates the occurrence of water gas reaction within a melting furnace.