Continuous centrifugal extraction dephenolization wastewater treatment device

Abstract

The utility model relates to a continuous centrifugal extraction dephenolization wastewater treatment device which comprises an extraction centrifugal unit and a regeneration centrifugal unit, the extraction centrifugal unit is formed by sequentially connecting a plurality of stages of extraction centrifuges in series, and the regeneration centrifugal unit is formed by sequentially connecting a plurality of stages of regeneration centrifuges in series; the extraction centrifugal machine at the foremost end is connected with a phenolic wastewater pipeline and an extraction agent pipeline, the extraction centrifugal machine at the rearmost end is connected with a dephenolized wastewater pipeline and an extract pipeline, the extract pipeline is connected with the regeneration centrifugal machine at the foremost end, the regeneration centrifugal machine at the foremost end is connected with a dilute alkali pipeline, and the regeneration centrifugal machine at the rearmost end is connected with a phenol sodium salt pipeline. The regeneration centrifugal machine at the rearmost end is connected with a regeneration extraction agent pipeline; and the regeneration extraction agent pipeline is connected with the extraction agent pipeline. The centrifugal machines are used in the extraction process and the extraction agent regeneration process, wastewater treatment equipment is miniaturized, the phenolic wastewater treatment investment is reduced, the operation cost of wastewater treatment is reduced, and phenolic wastewater treatment is more convenient and more flexible.

Description

Technical Field

[0001] This utility model relates to the field of phenol-containing wastewater treatment in coal chemical industry, and in particular to a continuous centrifugal extraction device for phenol removal wastewater treatment. Background Technology

[0002] Phenolic wastewater contains large amounts of phenol. If not effectively treated, it poses a significant threat to humans, aquatic life, and crops. Therefore, phenolic wastewater must be treated before discharge or reused as industrial water to alleviate water scarcity. Phenolic wastewater mainly originates from petrochemical plants, oil refineries, and coking plants. In recent years, the demand for treating small-volume phenolic wastewater has been increasing. Currently, most methods for treating phenolic wastewater employ extraction towers and regeneration towers, which require large floor space and are costly. Utility Model Content

[0003] This invention aims to address the shortcomings of existing technologies by providing a continuous centrifugal extraction device for phenol removal wastewater treatment, which saves costs and efficiently and quickly treats small-flow phenol-containing wastewater.

[0004] To achieve the above objectives, this utility model adopts the following technical solution:

[0005] A continuous centrifugal extraction phenol removal wastewater treatment device includes an extraction centrifuge unit and a regeneration centrifuge unit. The extraction centrifuge unit is composed of several extraction centrifuges connected in series, and the regeneration centrifuge unit is composed of several regeneration centrifuges connected in series.

[0006] The phenol-containing wastewater inlet of the foremost extraction centrifuge is connected to a phenol-containing wastewater pipe, the extractant inlet of the foremost extraction centrifuge is connected to an extractant pipe, the phenol-removing wastewater outlet of the last extraction centrifuge is connected to a phenol-removing wastewater pipe, the extract outlet of the last extraction centrifuge is connected to an extract pipe, the extract pipe is connected to the extract inlet of the foremost regeneration centrifuge, the dilute alkali inlet of the foremost regeneration centrifuge is connected to a dilute alkali pipe, the sodium phenolate outlet of the last regeneration centrifuge is connected to a sodium phenolate pipe, the regeneration extractant outlet of the last regeneration centrifuge is connected to a regeneration extractant pipe, and the regeneration extractant pipe is connected to the extractant pipe.

[0007] An extract preheater is installed on the extract pipeline.

[0008] The number of stages of the extraction centrifuges connected in series in the extraction centrifuge unit ranges from 1 to 6.

[0009] The number of stages of the regeneration centrifuges connected in series in the regeneration centrifuge unit ranges from 1 to 6.

[0010] The beneficial effects of this utility model are: both the extraction process and the extractant regeneration process of this utility model use centrifuges, the wastewater treatment equipment is miniaturized, the investment in phenol-containing wastewater treatment is reduced, the operating cost of wastewater treatment is reduced, and the treatment of phenol-containing wastewater is made more convenient and flexible. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] In the diagram: 1-Extraction centrifuge; 2-Regeneration centrifuge; 3-Phenolic wastewater inlet; 4-Phenolic wastewater pipeline; 5-Extractant inlet; 6-Extractant pipeline; 7-Phenolic removal wastewater outlet; 8-Phenolic removal wastewater pipeline; 9-Extract outlet; 10-Extract pipeline; 11-Extract preheater; 12-Extract inlet; 13-Dilute alkali inlet; 14-Dilute alkali pipeline; 15-Sodium phenolate outlet; 16-Sodium phenolate pipeline; 17-Regeneration extractant outlet; 18-Regeneration extractant pipeline.

[0013] The following will describe in detail the embodiments of this utility model with reference to the accompanying drawings. Detailed Implementation

[0014] The principles and features of this utility model are described below with reference to the accompanying drawings. The embodiments described are for illustrative purposes only and are not intended to limit the scope of this utility model. The utility model is described more specifically in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0015] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] like Figure 1 As shown, a continuous centrifugal extraction wastewater treatment device includes an extraction centrifuge unit and a regeneration centrifuge unit.

[0019] The extraction centrifuge unit is composed of several stages of extraction centrifuges 1 connected in series. The number of stages of the extraction centrifuges 101 connected in series within the extraction centrifuge unit 1 is 1-6.

[0020] The regeneration centrifuge unit consists of several stages of regeneration centrifuges 2 connected in series, with the number of stages of the regeneration centrifuges 2 connected in series within the regeneration centrifuge unit ranging from 1 to 6.

[0021] The phenol-containing wastewater inlet 3 of the foremost extraction centrifuge 1 is connected to a phenol-containing wastewater pipe 4. The extractant inlet 5 of the foremost extraction centrifuge 1 is connected to an extractant pipe 6. The phenol-removing wastewater outlet 7 of the last extraction centrifuge 1 is connected to a phenol-removing wastewater pipe 8. The extract outlet 9 of the last extraction centrifuge 1 is connected to an extractant pipe 10. An extractant preheater 11 is installed on the extractant pipe 10. The extractant pipe 10 is connected to the extractant inlet 12 of the foremost regeneration centrifuge 2. The dilute alkali inlet 13 of the foremost regeneration centrifuge 2 is connected to a dilute alkali pipe 14. The sodium phenolate outlet 15 of the last regeneration centrifuge 2 is connected to a sodium phenolate pipe 16. The regeneration extractant outlet 17 of the last regeneration centrifuge 2 is connected to a regeneration extractant pipe 18. The regeneration extractant pipe 18 is connected to the extractant pipe 6.

[0022] The extract preheater 3 is any one of the following: floating head heat exchanger, fixed tube sheet heat exchanger, U-shaped tube sheet heat exchanger, plate heat exchanger, or spiral plate heat exchanger. Specific Implementation Example 1:

[0024] The phenol-containing wastewater has a CODcr of 20,000 mg / L and a phenol content of 15,000 mg / L. This phenol-containing wastewater enters from the phenol-containing wastewater inlet 3 of the extraction centrifuge 1. The extractant inlet 5 of the foremost extraction centrifuge 1 is connected to the extractant pipe 6. The extractant pipe 6 is connected to the regeneration extractant outlet 17 of the last regeneration centrifuge 2 via a regeneration extractant pipe 18. The volume ratio of extractant to phenol-containing wastewater is 1:6. The extract outlet 9 of the last extraction centrifuge 1 is connected to the first regeneration centrifuge 2 via the extract pipe 10. The extract enters the regeneration centrifuge 2 from the extraction centrifuge 1. The phenol-removing wastewater is discharged through the phenol-removing wastewater outlet 7 of the extraction centrifuge 1 via the phenol-removing wastewater pipe 8. The phenol-removing wastewater has a CODcr of 1,500 mg / L and a phenol content of ≤50 mg / L. A 6% dilute alkali solution enters the regeneration centrifuge 2 through the dilute alkali inlet 13, wherein the volume ratio of dilute alkali to extract is 1:10. In the regeneration centrifuge 2, the dilute alkali reacts with the phenol in the extract to regenerate the extractant. The regenerated extractant is connected to the extractant pipe 6 of the extraction centrifuge 1 through the regeneration extractant outlet 17 and the regeneration extractant pipe 18. The sodium phenolate produced by the reaction is discharged through the sodium phenolate pipe 16 of the regeneration centrifuge 2, and the concentration of sodium phenolate is 22%. Specific Implementation Example 2:

[0026] The phenol-containing wastewater has a CODcr of 40,000 mg / L and a phenol content of 25,000 mg / L. This phenol-containing wastewater enters from the phenol-containing wastewater inlet 3 of the extraction centrifuge 1. The extractant inlet 5 of the foremost extraction centrifuge 1 is connected to the extractant pipe 6. The extractant pipe 6 is connected to the regeneration extractant outlet 17 of the last regeneration centrifuge 2 via a regeneration extractant pipe 18. The volume ratio of extractant to phenol-containing wastewater is 1:4. The extract outlet 9 of the rear extraction centrifuge 1 is connected to the foremost regeneration centrifuge 2 via the extract pipe 10. The extract enters the regeneration centrifuge 2 from the extraction centrifuge 1. The phenol-removing wastewater is discharged through the phenol-removing wastewater outlet 7 of the extraction centrifuge 1 via the phenol-removing wastewater pipe 8. The phenol-removing wastewater has a CODcr of 1,000 mg / L and a phenol content of ≤10 mg / L. A 10% dilute alkali solution enters the regeneration centrifuge 2 through the dilute alkali inlet 13, wherein the volume ratio of dilute alkali to extract is 1:5. In the regeneration centrifuge 2, the dilute alkali reacts with the phenol in the extract to regenerate the extractant. The regenerated extractant is connected to the extractant pipe 6 of the extraction centrifuge 1 through the regeneration extractant outlet 17 and the regeneration extractant pipe 18. The sodium phenolate produced by the reaction is discharged through the sodium phenolate pipe 16 of the regeneration centrifuge 2, and the concentration of sodium phenolate is 25%.

[0027] Phenolic compounds are organic substances, and their solubility in the extractant is much greater than their solubility in water. Therefore, under the centrifugal force of extraction centrifuge 1, the extractant and phenol in the wastewater not only rapidly transfer the phenol to the extractant with greater solubility, but also completely separate the phenol-rich extractant (hereinafter referred to as the extract) from the wastewater, thus achieving phenol removal from the wastewater. Since phenolic substances are weakly acidic and can undergo a neutralization reaction with dilute alkali, under the centrifugal force of regeneration centrifuge 2, not only do the phenol and alkali fully react to form the corresponding phenol salts, but the extractant and phenol salts are also completely separated, thus achieving the regeneration of the extractant. The regenerated extractant is returned to extraction centrifuge 1 for recycling.

[0028] This invention can reduce energy consumption, investment costs, and operating costs, and has the following advantages:

[0029] 1. Centrifuge equipment is used for both extraction and extraction agent regeneration, which opens up a path for the miniaturization of wastewater phenol removal equipment. With the help of centrifugal force, the phenol removal and component separation of wastewater are completed in the same equipment, and the separation effect is very thorough.

[0030] 2. The wastewater treatment process operates at low temperatures and without the addition of any chemical agents, resulting in low operating costs.

[0031] 3. The extractant complies with relevant water treatment standards and is a safe, environmentally friendly, and low-toxic reagent. The extractant has a low fire safety rating and is relatively safe to operate.

[0032] 4. The equipment has a simple structure, occupies little space, requires little investment, and is easy to install.

[0033] 5. The wastewater treatment process not only does not produce waste gas, waste liquid, or waste, but also produces phenolic salt byproducts, which can be sold externally.

[0034] The present invention has been described above with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A continuous centrifugal extraction phenol removal wastewater treatment apparatus characterized by comprising: The extraction centrifuge group and the regeneration centrifuge group, the extraction centrifuge group is composed of several extraction centrifuges (1) in series, and the regeneration centrifuge group is composed of several regeneration centrifuges (2) in series; The phenol-containing wastewater inlet (3) of the frontmost extraction centrifuge (1) is connected with a phenol-containing wastewater pipeline (4), the extractant inlet (5) of the frontmost extraction centrifuge (1) is connected with an extractant pipeline (6), the dephenolized wastewater outlet (7) of the last extraction centrifuge (1) is connected with a dephenolized wastewater pipeline (8), the extract outlet (9) of the last extraction centrifuge (1) is connected with an extract pipeline (10), the extract pipeline (10) is connected with the extract inlet (12) of the frontmost regeneration centrifuge (2), the dilute alkali inlet (13) of the frontmost regeneration centrifuge (2) is connected with a dilute alkali pipeline (14), the sodium phenate outlet (15) of the last regeneration centrifuge (2) is connected with a sodium phenate pipeline (16), the regenerated extractant outlet (17) of the last regeneration centrifuge (2) is connected with a regenerated extractant pipeline (18), and the regenerated extractant pipeline (18) is connected with the extractant pipeline (6).

2. The continuous centrifugal extraction dephenolization wastewater treatment device according to claim 1, characterized in that, The extract pipeline (10) is provided with an extract preheater (11).

3. A continuous centrifugal extractive dephenolization wastewater treatment device according to claim 2, characterized in that, The number of the extraction centrifuges (1) in series in the extraction centrifuge group is 1-6.

4. The continuous centrifugal extraction dephenolization wastewater treatment device according to claim 3, characterized in that, The number of the regeneration centrifuges (2) in series in the regeneration centrifuge group is 1-6.

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