Phenol-containing wastewater precipitation and dephenolization photo-catalytic oxidation integrated device

Abstract

A phenol-containing wastewater precipitation dephenolization photocatalytic oxidation integrated device comprises a precipitation reactor and a photocatalytic oxidation device which are connected in series, a phenol-containing wastewater inlet is formed in one side of the precipitation reactor, a phenate precipitation outlet is formed in the lower portion of the precipitation reactor, and a feeding opening is formed in the top end of the precipitation reactor. The waste liquid after phenol recovery is pumped into the photocatalytic oxidation devices connected in series by the precipitation reactor through a delivery pump; phenol-containing wastewater enters from a side phenol-containing wastewater inlet, a barium chloride precipitant is added from a top feeding port, the pH value in the precipitation reactor is 10-14, the high-concentration phenol-containing wastewater reacts with the precipitant, and generated phenate precipitate is discharged from a lower phenate precipitate outlet and used for acidification recovery; the waste liquid after phenol recovery is pumped into a photocatalytic oxidation device by a delivery pump, and residual organic pollutants in the waste liquid in the photocatalytic oxidation device are thoroughly oxidized and degraded; the phenolic wastewater treatment device disclosed by the utility model realizes graded and quality-divided treatment of phenolic wastewater, and has the advantages of exquisite design, recoverable resources, greenness and low carbon.

Description

Technical Field

[0001] This utility model belongs to the field of high-concentration phenol-containing wastewater treatment technology, specifically relating to an integrated device for phenol-containing wastewater precipitation, phenol removal, and photocatalytic oxidation. Background Technology

[0002] Phenolic wastewater originates from industries such as petrochemicals, coal chemicals, pharmaceuticals, and textiles, and is characterized by its wide range of sources, large production volumes, and difficulty in degradation. Improper treatment can cause serious environmental pollution. Phenolic substances are teratogenic, carcinogenic, and mutagenic; high concentrations can denature proteins they come into contact with, and ingestion of just 1 gram is enough to be fatal to humans. Six of the pollutants prioritized for water pollution control in China are phenolic substances, and the Chinese Integrated Wastewater Discharge Standard (GB 8978—1996) stipulates that the concentration of phenols in industrial wastewater cannot exceed 0.5 mg / L. Furthermore, phenolic compounds are important chemical raw materials and intermediates in fine chemical processes.

[0003] Currently, there are many methods for treating phenol-containing wastewater, which can be mainly divided into physical methods, chemical methods, and biological methods. Each single treatment method has certain limitations.

[0004] Currently available treatment devices employ single precipitation, extraction, or oxidation methods. While precipitation or extraction can recover resources, residual pollutants such as phenols or solvents remain in the treated water. Various oxidation methods oxidize phenols to carbon dioxide, failing to recover phenolic resources. There is a lack of devices for graded and differentiated treatment of high-concentration phenol-containing wastewater. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide an integrated device for precipitation, phenol removal and photocatalytic oxidation of phenol-containing wastewater. Through the precipitation reactor and photocatalytic oxidation device connected in series, it combines precipitation and photocatalytic oxidation methods. The design is ingenious, requires no external oxidant, can recover resources and treat thoroughly, and can realize the graded treatment of phenol-containing wastewater. This utility model has the advantages of being green and low-carbon.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An integrated device for phenol-containing wastewater precipitation, phenol removal, and photocatalytic oxidation includes a precipitation reactor 1 and a photocatalytic oxidation device 4 connected in series. The precipitation reactor 1 has a phenol-containing wastewater inlet 7 on one side, a phenol salt precipitation outlet 2 at the bottom, and a feed port 5 at the top. The wastewater after phenol recovery is pumped from the precipitation reactor 1 into the photocatalytic oxidation device 4 connected in series via a transfer pump 3.

[0008] The sedimentation reactor 1 consists of multiple reactors connected in series. The waste liquid after separation and sedimentation is pumped into the next sedimentation reactor by the transfer pump 3.

[0009] The bottom of the phenol salt precipitation outlet 2 is connected to a valve.

[0010] The photocatalytic oxidation device 4 includes a reaction chamber 4-1, a catalyst carrier 4-3 is disposed inside the reaction chamber 4-1, a photocatalyst is loaded on the catalyst carrier 4-3, a light source 4-2 is disposed on the base of the catalyst carrier 4-3, and an exhaust outlet 9 is opened on the upper side of one side of the photocatalytic oxidation device 4.

[0011] The light source 4-2 is an ultraviolet lamp; the photocatalyst includes nano-TiO2, iron salt or molybdenum salt.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model combines the advantages of precipitation and photocatalytic oxidation by using a precipitation reactor 1 and a photocatalytic oxidation device 4 connected in series, overcoming the disadvantages of a single precipitation or oxidation method. It can perform graded treatment of high-concentration phenol-containing wastewater, namely, the first stage is to recover the wastewater through precipitation in the precipitation reactor 1 for resource utilization; the second stage is to treat the wastewater through photocatalytic oxidation in the photocatalytic oxidation device 4 for harmless treatment.

[0014] 2. The integrated photocatalytic oxidation device for phenol-containing wastewater precipitation and phenol removal of this utility model uses a catalyst carrier 4-3 loaded with a photocatalyst and a light source 4-2 set at its bottom to oxidize the residual phenols in the wastewater after phenol removal. No external oxidant is required during the oxidation process, making it green and environmentally friendly.

[0015] In summary, this invention combines precipitation and photocatalytic oxidation methods through a series-connected precipitation reactor 1 and photocatalytic oxidation device 4. The design is ingenious, requires no external oxidant, can recover resources and treat wastewater thoroughly, and can achieve graded treatment of phenol-containing wastewater. This invention has the advantages of being green and low-carbon. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the precipitation reactor 1 of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the photocatalytic oxidation device 4 of this utility model.

[0019] The components include: 1. Precipitation reactor; 2. Phenol salt precipitation outlet; 3. Transfer pump; 4. Photocatalytic oxidation device; 4-1. Reaction chamber; 4-2. Light source; 4-3. Catalyst carrier; 5. Feed port; 7. Phenol-containing wastewater inlet; and 9. Discharge outlet. Detailed Implementation

[0020] The structural and working principles of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1 A photocatalytic oxidation device for phenol-containing wastewater precipitation and phenol removal is provided, consisting of a phenol-containing wastewater precipitation reactor 1 and a photocatalytic oxidation device 4 connected in series. The precipitation reactor 1 has a phenol-containing wastewater inlet 7 on the side, a phenol salt precipitation outlet 2 at the bottom, and a feed port 5 on the top. The waste liquid after phenol recovery is pumped into the photocatalytic oxidation device 4 connected in series by a transfer pump 3.

[0022] The sedimentation reactor 1 consists of multiple reactors connected in series. The waste liquid after separation and sedimentation is pumped into the next sedimentation reactor by the transfer pump 3.

[0023] After the waste liquid is treated by the sedimentation reactor 1 to achieve a certain recovery rate, it is pumped into the photocatalytic oxidation device 4 by the transfer pump 3, where it undergoes photocatalytic oxidation degradation.

[0024] The bottom of the phenol salt precipitation outlet 2 is connected to a valve.

[0025] The photocatalytic oxidation device 4 includes a reaction chamber 4-1, inside which a catalyst carrier 4-3 is disposed, on which a photocatalyst is loaded, and a light source 4-2 is disposed on the base of the catalyst carrier 4-3. An external discharge outlet 9 is opened on the upper side of one side of the photocatalytic oxidation device 4. After the wastewater is treated by photocatalytic oxidation to meet the standards, it is discharged from the external discharge outlet 9 of the photocatalytic oxidation device 4.

[0026] The light source 4-2 is an ultraviolet lamp; the photocatalyst includes nano-TiO2, iron salt or molybdenum salt.

[0027] This invention utilizes the reaction of metal ions with phenols to generate a precipitate, thereby separating and recovering most of the phenol resources from wastewater. After precipitation and phenol removal, the remaining phenols in the water can be discharged in compliance with standards after photocatalytic oxidation. This device is ingeniously designed, capable of both resource recovery and thorough treatment, requiring no external oxidant, and boasting green and low-carbon advantages.

[0028] The working principle of this utility model is as follows:

[0029] Phenolic wastewater enters through the phenolic wastewater inlet 7 on the side of the sedimentation reactor 1, and barium chloride precipitant is added through the top feed port 5. The pH value in the sedimentation reactor 1 is 10-14, preferably 14. The high-concentration phenolic wastewater reacts with the precipitant, and the generated phenol salt precipitate is released through the lower phenol salt precipitate outlet 2 for acidification and recovery. The waste liquid after phenol recovery is pumped into the photocatalytic oxidation device 4 by the transfer pump 3. In the photocatalytic oxidation device 4, the residual organic pollutants in the waste liquid are completely oxidized and degraded. This utility model of an integrated phenolic wastewater sedimentation, phenol removal, and photocatalytic oxidation device first uses ion precipitation to recover most of the phenols in the phenolic wastewater, and then uses photocatalytic oxidation to treat the residual organic pollutants in the wastewater. This utility model realizes the graded and quality-based treatment of phenolic wastewater, and has the advantages of ingenious design, resource recovery, and green and low-carbon characteristics.

[0030] The treatment of phenol-containing wastewater should follow a graded and quality-based approach. For high-concentration phenol-containing wastewater, the useful phenolic resources should be recovered first, followed by harmless treatment, which protects the environment and conserves resources.

Claims

1. A phenol-containing wastewater precipitation-dephenolization photocatalytic oxidation integrated device, characterized in that, It comprises a precipitation reactor (1) and a photocatalytic oxidation device (4) connected in series, the precipitation reactor (1) is provided with a phenol-containing wastewater inlet (7) on one side, a phenate precipitation outlet (2) is arranged at the lower part of the precipitation reactor (1), and a feeding port (5) is arranged at the top end of the precipitation reactor (1); the waste liquid after recovery of phenols is pumped into the photocatalytic oxidation device (4) connected in series through the delivery pump (3) of the precipitation reactor (1).

2. The phenol-containing wastewater precipitation-dephenolation integrated device according to claim 1, characterized in that, The precipitation reactor (1) is composed of multiple-stage series reactors, and the waste liquid after separation and precipitation is pumped into the next-stage precipitation reactor by the delivery pump (3).

3. The phenol-containing wastewater precipitation-dephenolation integrated device according to claim 1, characterized in that, The bottom of the phenate precipitation outlet (2) is connected with a valve.

4. The phenol-containing wastewater precipitation-dephenolation integrated device according to claim 1, characterized in that, The photocatalytic oxidation device (4) comprises a reaction cavity (4-1), the reaction cavity (4-1) is internally provided with a catalyst carrier (4-3), the catalyst carrier (4-3) is loaded with a photocatalyst, a light source (4-2) is arranged on the base of the catalyst carrier (4-3), and an external discharge outlet (9) is arranged on the upper part of one side of the photocatalytic oxidation device (4).

5. The phenol-containing wastewater precipitation-dephenolation integrated device according to claim 4, characterized in that, The light source (4-2) is an ultraviolet lamp; the photocatalyst comprises nano TiO2, iron salt or molybdenum salt.

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