The pyrolysis gasification/melting process for the municipal, industrial and other kinds of wastes has been developed by Institute for Advanced Engineering (IAE) and Daewoo E&C CO. in order to make available a thermal waste treatment technology avoiding major environmental problems that are known in traditional techniques like landfills or incineration. The process is based upon the ThermoselectTM system that consists of steps for compression, degassing with fixed bed oxygen blown gasification, and melting of mineral residues. The syngas exiting from the high temperature reactor with a high temperature is cooled under about 100 ℃ in the quench scrubber by jets of water, and is purified in wet type scrubbers. For the gas cooling and purification, it is used water, so in this study for the reuse of water after syngas cooling and cleaning, it is installed cooling and cleaning water recycling system. As the test result, the removable efficiency of SS is 99.4% and color and several heavy metals is removed.