Oil-containing wastewater treatment system

Abstract

In order to simplify devices by efficiently combining dissimilarities of respective steps used in an oil-containing wastewater treatment system, in a supply path of raw water produced from oil-containing wastewater, a separation tank for floating and separating an oil content, and downstream from the separation tank, a membrane filtration tank in which a membrane separation module produced from a hollow fiber membrane or a flat membrane is disposed therein and a diffuser for generating air bubbles is installed below the membrane separation module is disposed, and a supply pipe provided with a circulating pump in the middle thereof to supply the raw water from the separation tank to the membrane filtration tank, and a return pipe for returning unfiltered water containing the oil content and the air bubbles from the membrane filtration tank to the separation tank are provided.

Description

technical field [0001] The present invention relates to an oily wastewater treatment system, in particular, to such an oily wastewater treatment system, which combines separation (including flotation and sedimentation) in the pretreatment process with membrane filtration in the posttreatment process, and wherein , to perform efficient processing by combining functions in the pre-processing process with those in the post-processing process. Background technique [0002] Various treatment devices and treatment methods have been proposed for removing oil from oily wastewater. In general, in oily wastewater treatment, pretreatment including coagulation sedimentation / pressurized flotation and the like is performed, and then posttreatment including filtration, activated carbon treatment and the like is performed. However, in a treatment system that continuously performs a plurality of wastewater treatment processes, the amount of water that can be treated decreases as the treatme...

Images