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|1. (WO2018181262) OILY WASTEWATER TREATMENT DEVICE AND OILY WASTEWATER TREATMENT METHOD USING SAME|
|Title:||OILY WASTEWATER TREATMENT DEVICE AND OILY WASTEWATER TREATMENT METHOD USING SAME|
Provided are an oily wastewater treatment device that can process smoothly, can reduce costs for processing, and can perform wastewater treatment capable of purifying water to a level below the release standard value for public waters with little impact on the environment and an oily wastewater treatment method using same. An oily wastewater treatment device 1 comprises: a primary filter unit 7 that performs ultrafiltration on an oil-containing emulsion contained in oil-containing wastewater and that separates the oil-containing emulsion into an oil component and primary treated water; and a secondary filter unit 8 that performs a filtration treatment using a reverse osmosis membrane on the primary treated water separated by the first filter unit and that separates the primary treated water into low-molecular-weight impurities that were not removed by the primary filter unit and secondary treated water. The primary filter unit 7 is a filter having an ultrafiltration membrane filter structure of a tubular membrane type or a spiral membrane type, and the secondary filter unit 8 is a filter having a filter structure in which a plurality of disk-shaped reverse osmosis membranes is stacked.