CN-224226718-U - Wastewater treatment device

CN224226718UCN 224226718 UCN224226718 UCN 224226718UCN-224226718-U

Abstract

The application provides a wastewater treatment device which comprises a wastewater feeding pump, an extractant feeding pump, an extraction tower, an extraction recovery tower and a reflux loop, wherein the wastewater feeding pump and the extractant feeding pump are respectively connected with the middle upper part and the middle lower part of the extraction tower and used for conveying wastewater and extractant to the extraction tower, the extraction tower is used for extracting the wastewater through the extractant to generate an extraction phase and a water phase from top to bottom, the extraction recovery tower is connected with the top end of the extraction tower and used for collecting the extraction phase in the extraction tower and treating the extraction phase to obtain extractant at the top of the extraction tower and residues containing aromatic hydrocarbon oil at the bottom of the extraction tower, and the reflux loop is connected with the middle lower part of the extraction tower and the top of the extraction recovery tower and used for conveying the extractant at the top of the extraction recovery tower back to the extraction tower. The application reduces the wastewater treatment cost, does not produce secondary pollutants in the treatment process, can produce byproducts, and has certain economic benefit.

Inventors

GUO BENHUI
SUN BO
LI HUI
SONG LEPING
XING JIANNAN

Assignees

上海天汉环境资源有限公司
上海丛麟环保科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250509

Claims (7)

1. A wastewater treatment device is characterized by comprising a wastewater feed pump, an extractant feed pump, an extraction tower, an extraction recovery tower and a reflux loop, The waste water feeding pump is connected with the middle upper part of the extraction tower and is used for conveying waste water to the extraction tower; the extractant feeding pump is connected with the middle lower part of the extraction tower and is used for conveying extractant to the extraction tower; The extraction tower is used for extracting the wastewater through an extractant to generate an extraction phase and a water phase from top to bottom; the extraction recovery tower is connected with the top end of the extraction tower and is used for collecting the extraction phase in the extraction tower and treating the extraction phase to obtain an extractant positioned at the top of the tower and a residue containing aromatic hydrocarbon oil at the bottom of the tower; The reflux loop is connected with the middle lower part of the extraction tower and the top of the extraction recovery tower and is used for conveying the extractant positioned at the top of the extraction recovery tower back to the extraction tower.
2. The wastewater treatment apparatus of claim 1, further comprising a first intermediate tank connected to the bottom of the extraction column for collecting the aqueous phase in the extraction column.
3. The wastewater treatment apparatus according to claim 2, wherein a chemical oxygen demand analyzer is provided in the first intermediate tank, the chemical oxygen demand analyzer being configured to detect a chemical oxygen demand content of the water phase in the first intermediate tank.
4. The wastewater treatment apparatus of claim 2, further comprising an aqueous phase treatment assembly for anaerobically treating the aqueous phase in the first intermediate tank.
5. The wastewater treatment apparatus of claim 1, further comprising a distillation assembly for distillative treatment of the extract phase in the extraction recovery column.
6. The wastewater treatment apparatus of claim 1, further comprising a second intermediate tank connected to the bottom of the extraction recovery column for collecting aromatic oil-containing residues at the bottom of the extraction recovery column.
7. The wastewater treatment apparatus according to claim 1, wherein the extraction column and the extraction recovery column are provided with a regulating pump for controlling a flow rate of the extraction phase flowing from the extraction column to the extraction recovery column.

Description

Wastewater treatment device Technical Field The application relates to the technical field of waste lubricating oil recovery, in particular to a wastewater treatment device. Background The waste lubricating oil is the oil which is changed after the physicochemical properties of the waste lubricating oil reach the oil change index due to oxidation, thermal decomposition, impurity pollution and the like in the use process of various machines and equipment. The waste lubricating oil is polluted by water in the using, collecting, recycling and reutilizing processes, so that emulsified water is formed. In the regeneration process of the waste lubricating oil, the water is required to be distilled and removed firstly, and the water, the ineffective additive, the low-boiling aromatic hydrocarbon and the like in the dehydration process are distilled and removed together due to the influence of factors such as the ineffective additive and the like in the lubricating oil, so that the distilled water contains a large amount of soluble aromatic hydrocarbon and sulfur-containing compounds, has high COD (chemical oxygen demand) and malodor, and has the sulfur content of more than 3000 ppm. The distilled water cannot be effectively treated by adopting conventional water treatment methods, such as SBR (styrene butadiene rubber), MBR (membrane bioreactor), biochemistry, fenton, high-pressure oxidation and other technologies. The currently available treatment methods are incineration, secondary distillation. The two methods have high cost and generate secondary pollutants. Disclosure of Invention The application provides a wastewater treatment device, which solves the problems of high wastewater treatment cost and secondary pollutant generation in the prior art, can reduce the wastewater treatment cost, can not generate secondary pollutant in the treatment process, can generate byproducts, and generates certain economic benefit. The application provides a wastewater treatment device, which comprises a wastewater feed pump, an extractant feed pump, an extraction tower, an extraction recovery tower and a reflux loop, The waste water feeding pump is connected with the middle upper part of the extraction tower and used for conveying waste water to the extraction tower, the extractant feeding pump is connected with the middle lower part of the extraction tower and used for conveying extractant to the extraction tower, the extraction tower is used for extracting the waste water through the extractant to generate an extraction phase and a water phase from top to bottom, the extraction recovery tower is connected with the top end of the extraction tower and used for collecting the extraction phase in the extraction tower and treating the extraction phase to obtain extractant positioned at the top of the extraction tower and residues containing aromatic hydrocarbon oil at the bottom of the extraction tower, and the reflux loop is connected with the middle lower part of the extraction tower and the top of the extraction recovery tower and used for conveying the extractant positioned at the top of the extraction recovery tower back to the extraction tower. Specifically, the wastewater treatment device further comprises a first intermediate tank, wherein the first intermediate tank is connected with the bottom of the extraction tower and is used for collecting the water phase in the extraction tower. Specifically, a chemical oxygen demand analyzer is arranged in the first intermediate tank, and the chemical oxygen demand analyzer is used for detecting the content of chemical oxygen demand of the water phase in the first intermediate tank. Specifically, the wastewater treatment device further comprises an aqueous phase treatment assembly, wherein the aqueous phase treatment assembly is used for carrying out anaerobic treatment on the aqueous phase in the first intermediate tank. Specifically, the wastewater treatment device further comprises a distillation component, wherein the distillation component is used for performing distillation treatment on an extraction phase in the extraction recovery tower. Specifically, the wastewater treatment device further comprises a second intermediate tank, wherein the second intermediate tank is connected to the bottom of the extraction recovery tower and is used for collecting residues containing aromatic hydrocarbon oil at the bottom of the extraction recovery tower. Specifically, the extraction column and the extraction recovery column are provided with a regulating pump for controlling the flow rate of the extraction phase flowing from the extraction column to the extraction recovery column. Compared with the prior art, the waste water enters the middle upper part of the extraction tower through the waste water feeding pump, the extracting agent enters the middle lower part of the extraction tower through the extracting agent feeding pump, and the waste water and the extracting agent are mixed and