초록 ▼

The present invention relates to the techniques of treating a liquid material to be treated, which enables efficient fractional removal of toxic materials such as PCB in a liquid mixture. The treatment method of the invention comprises the step of permitting a liquid material containing materials ha

The present invention relates to the techniques of treating a liquid material to be treated, which enables efficient fractional removal of toxic materials such as PCB in a liquid mixture. The treatment method of the invention comprises the step of permitting a liquid material containing materials having different solidifying points to be cooled at a temperature at which desired material(s) is solidified while others are not solidified and the step of separating the solidified material from other liquid materials whereby the desired material is separated, and therefore large facilities are not necessary and toxic materials can be reliably separated and removed.

대표청구항 ▼

1. A method of separating polychlorobiphenyl (PCB) from a PCB-containing waste oil which contains PCB having a different solidifying point than the remaining waste oil, comprising the steps of: cooling the PCB-containing waste oil to a temperature at which PCB is solidified while the remaining wa

1. A method of separating polychlorobiphenyl (PCB) from a PCB-containing waste oil which contains PCB having a different solidifying point than the remaining waste oil, comprising the steps of: cooling the PCB-containing waste oil to a temperature at which PCB is solidified while the remaining waste oil is not solidified, wherein said cooling step includes transferring said waste oil to a primary liquid cooling tank, a secondary cooling tank, and a third cooling tank, to prevent the solidified PCB from being redissolved; contacting the waste oil containing the solidified PCB with a filter aid to which the solidified PCB binds; separating the PCB-bound filter aid from the remaining waste oil by filtration; and eluting the PCB from said PCB-bound filter aid to separate the PCB. 2. The treatment method according to claim 1, wherein said filtration is conducted by vacuum filtration. 3. The method according to claim 1, wherein the PCB is eluted by heating. 4. An apparatus for separating PCB from PCB-containing waste oil which contains PCB having a different solidifying point than the remaining waste oil, comprising: a primary cooling tank for cooling the PCB-containing waste oil to a temperature at which PCB is solidified while the remaining waste oil is not solidified; a secondary cooling tank for additionally cooling the PCB-containing waste oil to enhance solidification of the PCB; a third cooling tank for additionally cooling the PCB-containing waste oil cooled in the secondary cooling tank, to prevent the solidified PCB from being redissolved; a separator for separating said solidified PCB from the remaining waste oil by filtration; a filter aid tank for adding a filter aid to contact the filter aid with the solidified PCB upstream of said separator wherein the solidified PCB is bound to the filter aid; and a recovery device for eluting and recovering the PCB from the PCB-bound filter aid. 5. The apparatus according to claim 4, wherein said separator is a vacuum filtration device. 6. The apparatus according to claim 5, further comprising a heater for heating said recovery device to further separate said filter aid from said recovered PCB. 7. The apparatus according to claim 4, wherein the recovery device includes a heater to elute the PCB from the PCB-bound filter aid by heating.