Patent ID: 7387727

Claim:
A contaminated liquid filtration system vehicle which travels to a contaminated liquid collection unit in a factory or the like and treats the contaminated liquid within the collection unit, comprising: vehicle driving unit comprising a driving engine and a driving mechanism; suction unit for aspirating the contaminated liquid within said contaminated liquid collection unit as liquid to be treated; a filtration system constituted by a charged filter device, a charged coalescer type oil water separator, and a microfiltration device comprising hollow fiber membranes of an internal pressure circulation system, for filtration treating the aspirated liquid to be treated; electric power supply unit for supplying a driving power source to said filtration system; delivery unit for returning treated liquid which has been treated in said filtration system to the same or a different collection unit in the factory or the like; and control unit for controlling operations of said filtration system, wherein said charged filter device is caused to advance the filtration of impurity particles by applying a voltage between electrodes within said charged filter device using the driving power source supplied from said electric power supply unit, said charged coalescer type oil water separator is caused to advance oil water separation by applying a voltage between electrodes within the oil water separator using the driving power source supplied from said electric power supply unit, and wherein the discharge path to discharge the concentrated liquid bifurcates from the primary side circulation path of said microfiltration device, the open/close valve is provided on the discharge path, a concentration detection unit for detecting the density of the concentrated liquid is provided on said primary side circulation path, and said control unit control the discharge of said concentrated liquid by opening the open/close valve when the concentration of the concentrated liquid in the primary side circulation path, which is detected by said concentration detection unit, exceeds a predetermined value.