Oily wastewater treatment device and oily wastewater treatment method using same

Abstract

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.

Description

technical field [0001] The invention relates to an oily wastewater treatment device and an oily wastewater treatment method using the device, in particular to an oily wastewater treatment device capable of performing wastewater treatment with less adverse impact on the environment and an oily wastewater treatment method using the device. Background technique [0002] In the manufacturing process of automobile parts and the like, oils such as cutting oil are used to improve lubricity when performing metal processing. Usually, metal processing is performed while applying oil to the metal surface to be processed, but since the oil is easy to burn, there is a possibility of causing a fire. [0003] Therefore, water-soluble oil and water (oil for metal processing) has been used in recent years. The oil-water is a mixture of water and oil using a surfactant or the like as a medium. [0004] This water-soluble oil and water is difficult to dispose of after use, and as a disposal ...

AI Technical Summary

Problems solved by technology

[0005] However, treatment methods such as evaporation or combustion in an incinerator have a problem of increased treatment costs due to the high water content of oily wastewater and the need for a large amount of energy for combustion.

In addition, when the recovered oil is incinerated, a large amount of carbon dioxide (CO 2 ), therefore, has the problem of adversely affecting the environment

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