Oil-water separation device

Abstract

The invention relates to an oil-water separation device which comprises a box body, the box body is provided with a feed liquid inlet and a water outlet, a treatment channel is formed between the feed liquid inlet and the water outlet in the box body, and a filtering mechanism for oil-water separation is arranged in the treatment channel. The filtering mechanism comprises a plurality of rotating shafts which are horizontally arranged, a driving mechanism for driving the rotating shafts to rotate and hydrophilic and oleophobic filter cloth which is wound on the rotating shafts and rotates along with the rotating shafts, and the hydrophilic and oleophobic filter cloth is annular; the hydrophilic and oleophobic filter cloth is provided with a water inlet surface corresponding to the feed liquid inlet, a water outlet surface corresponding to the water outlet, and an upper connecting surface and a lower connecting surface which are formed between the water inlet surface and the water outlet surface, and further comprises an oil sucking mechanism for sucking oil on the upper connecting surface away. The method has the characteristics of good recovery effect and low cost.

Description

technical field [0001] The invention relates to an oil-water separation device, in particular to a separation device for recovering oil from oil-containing wastewater. Background technique [0002] With the continuous development of petroleum, chemical, metallurgical and other processes, my country's oily wastewater is also increasing year by year. Among them, two types of oily wastewater treatment problems are becoming more and more serious. First, oilfield sewage (including oil-bearing drill cuttings) contains a large amount of mineral ions, various polymers and oils, among which oil and polymers are the main pollutants, and most of the produced water needs to be reinjected into oil wells on site. Effective treatment will have a significant impact on the recovery rate of oil wells, and the use of oil-displacing polymers will further increase the viscosity of oilfield produced water, resulting in difficult treatment; the second is the extraction of wastewater, and organic ...

AI Technical Summary

Problems solved by technology

First, oilfield sewage (including oily drill cuttings) contains a large amount of mineral ions, various polymers and oils, among which oils and polymers are the main pollutants, and most of the produced water needs to be reinjected into oil wells on site. Effective treatment will have a significant impact on the recovery rate of oil wells, and the use of oil displacement polymers will further increase the viscosity of oilfield produced water, resulting in difficulties in treatment; the second is the extraction of wastewater, which often requires the use of organic solvents during the extraction process For one or several products in the extraction mixture, in order to obtain a higher extraction effect, it is necessary to ensure sufficient mixing intensity, resulting in the formation of a stable emulsified raffinate. If the expensive extraction agent cannot be recovered quickly and efficiently at low cost, it will lead to cost surge

This emulsified raffinate is often mixed with many tiny particles and a highly viscous three-phase mixture, which brings greater difficulties to the recovery of the organic phase

[0003] Because the oil droplets are small and the density of the three-phase mixture is slightly lower than that of water, the gravity separator cannot achieve effective oil-water separation; and because the organic phase is relatively viscous, the use of membrane separation will cause serious membrane clogging and high operating costs, so It is necessary to develop an oil-water separation device with good recovery effect and low cost

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