Method and apparatus for separating water and oil from emulsified oil-containing wastewater

摘要

The present invention relates to a method for removing oil from wastewater containing oil emulsified by the action of a surfactant, characterized in that it comprises, in order to electrolyze the wastewater, Into a positive electrode compartment (15) in a diaphragm electrolytic bath (13) provided with a positive electrode and a negative electrode, respectively, which are provided in a part (15) and a negative electrode compartment (17) Flowing a portion of the effluent from the anode compartment (17) through the diaphragm into the anode compartment (17), withdrawing the effluent from the anode compartment (17), removing the remainder of the electrolyzed wastewater from the anode compartment Liquid separator 33, introducing a part of the influent from the upper part of the gas-liquid separator 33 into the layer 25 filled with the viscous material 25 Water separating step (2) for the desired water-water separation, introducing the remainder into the bottom of the gas-liquid separator (33) And mixing the mixture with the feed and recovering it to the electrolysis step. Preferably, in the diaphragm electrolysis step, the polarity of both electrodes is alternately switched at a certain time interval, the positive electrode compartment is switched to the negative electrode compartment, and the negative electrode compartment is switched to the positive electrode compartment.