Various embodiments provide methods for removing a PFC by concentration and separation. In an exemplary method, a PFC in an aqueous solution or in a mixed water-organic solvent solution can be adsorbed onto a surface of a floc generated by electroflocculation, to form sludge. The sludge containing the PFC can be centrifuged to separate the PFC from the sludge and to form a concentrated PFC solution. Eelectroflocculation provides a simple process that is easy to operate. Reaction conditions are mild. Energy consumption is low. Treatment effect is desirable, stable, and reliable. Industrial application can be easy to implement. Further, the centrifugal separation technology used for the harmless treatment of the generated PFC-containing sludge is novel and does not need to use chemicals. Further, dewatering of the sludge is achieved at the same time during the harmless treatment. The needed equipment is simple and can be automatically operated.