DECOMPOSING METHOD OF ORGANIC CHLORIC COMPOUND

PROBLEM TO BE SOLVED: To obtain a decomposing method of an organic chloric compound which can decompose organic chloric compounds, such as PCB or the like by using a microorganism without generating injurious material. SOLUTION: There are provided (1) an ultraviolet irradiation step which irradiates ultraviolet on a PCB 1 under existence of an IPA 2 and water 4, (2) a solvent recovery step which separates and recovers the IPA 2 from an ultraviolet treated liquid 5 after irradiation of ultraviolet, (3) a microorganism treating step which treats a solvent recovery residue 6 after the recovery of the solvent with species bacteria 8 for microorganism which can decompose an organic chloric compound in the solvent recovery residue with incubating and (4) a bacterium body recovery step which separates a bacterum body from treated culture solution 9. The bacterium body which is recovered in (4) the bacterium body recovery step is shattered in (5) a bacterium body shattering step then circulated to (3) the microorganism treating step.