A fluid treatment system, a fluid processing apparatus and a method of treating a mixture are provided in which a separator has two outlets for different components of mixed fluid. A conduit connecting one of the outlets of the separator to the inlet of the separator is provided to recycle fluid from an outlet of the separator back to the inlet and a pump at the inlet of the separator regulates the fluid flow through the separator at a constant rate. As a result, the flow rate through the separator is increased, which increases the separation efficiency of the separation system. The conduit also functions as a bypass line should the flow of fluid be obstructed through the separator. The conduit may preferably be operated in conjunction with an energy harvester.