TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The polar organic solvent recovered in the solvent recovery process, is circulated and reused for ultraviolet irradiation process. Lysate (15) obtained after non-polar solvent recovery process, and at least one part of the residual liquor after recovering microbial cell, are circulated to microorganism processing of organochlorine compound.Preferred Compound: The organochlorine compound is polychlorinated biphenyl (PCB) and organochlorine agrochemical such as hexachloro cyclohexane and dichloro diphenyl trichloroethane (DDT). SPECIFIC COMPOUNDS - The polar organic solvent is 2-isopropanol. The non-polar organic solvent is diethyl ether, hexane, chloroform, carbon tetrachloride, acetone or benzene.    The microorganism is Comamonas testosteroni.    EXAMPLE - Organochlorine compound such as polychlorinated biphenyl (PCB) was prepared by dissolving Money crawl KC1000 in 2-isopropanol (IPA), water and sodium hydroxide. The obtained solution having 2500 parts per million (ppm) of PCB was subjected to UV rays of 254 nm wavelength and strength of 8 kW/m3 for 48 hours. The concentration of PCB in the UV processed liquid was reduced to 8-14 ppm. Subsequently, IPA was recovered from the UV processed liquid at 70degreesC and vacuum pressure of 170 mmHg. The obtained residual liquor was cultured using a culture medium containing potassium phosphate, sodium phosphate, ammonium sulfate, magnesium sulfate, ferrous sulfate, calcium chloride, zinc sulfate, manganese sulfate, copper sulfate, cobalt sulfate, boric acid and Comamonas testosteroni, at 30degreesC for 2 days and the concentration of PCB in the culture solution was measured and found to be 500-550 ppb. Subsequently, the microbial cell was collected from the culture solution and the recovered microbial cell was bacteriolyzed using carbon tetrachloride (non-polar organic solvent) at 30degreesC for 30 minutes. The processed liquid after bacteriolysis was subjected to vacuum distillation at 30degreesC and 400 mmHg pressure, to recover carbon tetrachloride. The lysate obtained as a residual liquid was then circulated to microorganism process. Thus, the PCB was completely decomposed in short period time (48 hours), since the lysate was circulated continuously to the culture process. Thus, the amount of waste liquid generated during decomposition of PCB was reduced and the amount of chemicals needed for preparation of culture medium was reduced.