PURPOSE: To stabilize a decomposition treatment and to improve its efficiency by using a hydrophobing metal deposited catalyst in a reduction treatment catalyst for this compd., such as soil.
CONSTITUTION: The catalyst for the reduction treatment is constituted of the hydrophobing metal deposited catalyst formed by depositing metal, such as platinum palladium, ruthenium or rhodium, on a carrier, such as alumina, titania or active carbon, subjected to a hydrophobic treatment. Such catalyst is prepd. by a method of first subjecting the carrier to the hydrophobic treatment, then depositing the catalyst metal thereon, etc. The raw water in a raw water tank 1 is sent to a diffusion column 2 where a volatile org. halogen compd. is gasified. This gas is sent into a packed column 3 packed with this catalyst. Gaseous hydrogen is added as a reducing agent into this column at this time. The volatile org. halogen compd. is catalytically reduced to hydrogen halide and hydrocarbon in the column. The hydrogen halide is removed by a hydrogen halide removing device 4.
NAKAHARA TOSHIJI
TSURUMARU AKIYOSHI
IWASAKI MAKOTO
