Photocatalytic oxidation system integration device

Abstract

The utility model discloses a photo-catalytic oxidation system integrated device which comprises a tank body, and an acid adjusting area, a catalyst adding area, an oxidant adding area, a photo-catalytic reaction area, a catalyst analysis area, a coagulation and flocculation reaction area, a settling area and a sludge collecting area which are sequentially communicated are formed in the tank body; the acid adjusting area, the catalyst adding area and the oxidant adding area are formed in the center of the tank body, and the acid adjusting area is connected with a sewage inlet pipe; the annular photocatalytic reaction area is formed on the peripheries of the acid adjusting area, the catalyst adding area and the oxidant adding area, and the catalyst analysis area, the coagulation and flocculation reaction area, the settling area and the sludge collecting area are integrally and annularly distributed on the periphery of the photocatalytic reaction area. The device is high in integration degree and small in occupied area.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an integrated device for a photocatalytic oxidation system. Background Technology

[0002] In the context of rapid industrial development, while industrial manufacturing plays a vital role in economic growth, the large amounts of industrial wastewater discharged during industrial production cause severe pollution to the natural environment. Furthermore, industrial pollutants are diverse, and the composition of industrial wastewater is highly complex, characterized by high concentrations of COD, significant toxicity, and poor biochemical properties. Currently, industrial wastewater poses extremely high risks to the environment and society, directly or indirectly impacting rivers and groundwater. Severe pollution can cause serious damage to soil, aquatic plants, and crops. Additionally, industrial wastewater is volatile, producing irritating odors and contributing to air pollution. Furthermore, the harmful chemicals contained in industrial wastewater can enter the human body through the respiratory tract, and long-term accumulation can lead to various diseases, posing a serious threat to human health and life.

[0003] Existing advanced oxidation technologies for industrial wastewater mainly include Fenton oxidation, ozone oxidation, electrocatalysis, and photocatalytic oxidation. Among them, photocatalytic oxidation, as a relatively popular technology, suffers from drawbacks such as redundant and complex process flows, especially in the upgrading and renovation projects of existing enterprises and industrial parks with limited reserved space, and thus cannot meet market demands.

[0004] Therefore, it is necessary to provide a photocatalytic oxidation system integration device with a high degree of integration and a small footprint. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an integrated device for a photocatalytic oxidation system.

[0006] This utility model discloses a photocatalytic oxidation system integrated device, including: a tank body, wherein the tank body is formed with an acid adjustment zone, a catalyst addition zone, an oxidant addition zone, a photocatalytic reaction zone, a catalyst desorption zone, a coagulation and flocculation reaction zone, a sedimentation zone and a sludge collection zone connected in sequence.

[0007] The acidification zone, catalyst addition zone, and oxidant addition zone are formed at the center of the tank, and the acidification zone is connected to the sewage inlet pipe; the annular photocatalytic reaction zone is formed around the acidification zone, catalyst addition zone, and oxidant addition zone, and the catalyst desorption zone, coagulation and flocculation reaction zone, sedimentation zone, and sludge collection zone are arranged in a ring around the photocatalytic reaction zone.

[0008] As a further improvement of this utility model, the pool body is an integrated carbon steel anti-corrosion pool body or a reinforced concrete structure pool body. The acid adjustment zone, catalyst addition zone, and oxidant addition zone are integrated at the center of the annular pool body, independently separated but sequentially connected. The acid adjustment zone is equipped with an acid dosing system and an online pH monitor. The acid dosing system includes a dosing tank, which is connected to the inlet of the acid adjustment zone through a dosing pipeline. The dosing pipeline is equipped with valves and flow meters, etc. The acid dosing system adjusts the pH of the wastewater to 3-4, and the added acid is concentrated sulfuric acid or hydrochloric acid. Each of the acid adjustment zone, catalyst addition zone, and oxidant addition zone is equipped with... A vertical paddle mixer is used to thoroughly mix the wastewater and the reagent. A catalyst dosing system is installed in the catalyst dosing area. This system includes a dosing tank connected to the inlet of the catalyst dosing area via a pipeline equipped with valves and flow meters. The catalyst used is ferrous sulfate. Similarly, an oxidant dosing system is installed in the oxidant dosing area. This system also includes a dosing tank connected to the inlet of the oxidant dosing area via a pipeline equipped with valves and flow meters. The oxidant used is hydrogen peroxide.

[0009] As a further improvement of this utility model, the oxidant addition zone is connected to the photocatalytic reaction zone through a partitioned connection port. Multiple ultraviolet lamp groups and multiple submersible jet propellers are arranged in a ring within the photocatalytic reaction zone. The multiple submersible jet propellers are located inside the multiple ultraviolet lamp groups, and the wastewater is circulated and propelled within the ring-shaped photocatalytic reaction zone through the multiple submersible jet propellers. Preferably, the ultraviolet lamp group is a vertical integrated ultraviolet lamp assembly, which includes a light intensity detection system, a self-cleaning system, an intelligent electrical control box, and a high-efficiency cooling system, and can be manually operated or... Automatic timed backwashing ensures the light intensity of the reaction system; simultaneously, the number of UV lamp components can be increased or decreased according to treatment needs; the photocatalytic reaction zone is arc-shaped, allowing wastewater to fully react with the reagents under the hydraulic stirring of the submersible jet, while forming a closed-loop internal circulation within the system, maximizing the effective contact probability between wastewater, UV lamps, and reagents, thus reducing reagent dosage; an online ORP monitor is installed within the photocatalytic reaction zone, and the entire system is equipped with an intelligent control system to coordinate the start and stop of the dosing system and monitor the stability of the internal oxidizing epoxy environment.

[0010] As a further improvement of this utility model, the catalyst desorption zone is equipped with an alkali dosing system and an online pH monitor. The alkali dosing system includes a dosing tank, which is connected to the inlet of the catalyst desorption zone via a delivery pipeline. The delivery pipeline is equipped with valves and flow meters, etc. The alkali dosing system adjusts the pH of the wastewater to 6-8. The catalyst desorption zone is equipped with a perforated aeration component, which is connected to an external fan. Oxygen is introduced through the perforated aeration component to achieve the oxidation and precipitation of the catalyst.

[0011] As a further improvement of this utility model, the coagulation and flocculation reaction zone is divided into two compartments, namely the coagulation reaction zone and the flocculation reaction zone, and a vertical paddle mixer is provided in both the coagulation reaction zone and the flocculation reaction zone.

[0012] As a further improvement of this utility model, the coagulation and flocculation reaction zone is connected to the sedimentation zone through an annular sedimentation zone inlet channel at the top. A water distribution pipe is provided in the sedimentation zone inlet channel, and a baffle plate is provided on the side wall of the sedimentation zone below the water distribution pipe. After the sewage passes through the water distribution pipe, the baffle plate acts as a deflector to ensure that the water enters the separation layer of the sedimentation zone smoothly, avoiding the washing of the bottom sludge. A triangular weir plate is provided at the outlet of the sedimentation zone to ensure stable water flow around the perimeter and prevent short-circuiting.

[0013] As a further improvement of this utility model, the supernatant of the sedimentation zone is discharged through the sedimentation zone outlet channel at the top, and the sludge at the bottom of the sedimentation zone enters the sludge collection area through the peripheral drive sludge scraper and sludge discharge channel.

[0014] As a further improvement of this utility model, the track end of the peripheral drive sludge scraper in the sedimentation zone is equipped with a limiter, which enables the peripheral drive sludge scraper to move back and forth. A mud baffle and a sludge pump are set at the bottom to pump the sludge into the sludge discharge channel and finally into the sludge collection area.

[0015] As a further improvement of this utility model, the sedimentation zone adopts a ring-shaped structure with circumferential inflow and outflow, which improves the sludge separation effect. This design has a high hydraulic load and can effectively reduce the footprint of the process system.

[0016] As a further improvement of this utility model, a walkway is provided on the outermost periphery of the pool body.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] This invention can be applied to the treatment of industrial wastewater with high COD, recalcitrant degradation, and strong bioinhibition. It can be used as both a pretreatment stage and a deep treatment stage. As a pretreatment, it can effectively reduce bioinhibition and improve the B / C ratio, providing a strong guarantee for subsequent biochemical systems. As a subsequent deep treatment stage, it can deeply oxidize recalcitrant organic matter, ensuring stable and compliant COD emissions. As a highly integrated process with a high process load, it is perfectly suited for industrial wastewater upgrading and renovation projects with limited space. Attached Figure Description

[0019] Figure 1 This is a plan view of the photocatalytic oxidation system integration device disclosed in this utility model;

[0020] Figure 2 This is a cross-sectional view of the photocatalytic oxidation system integration device disclosed in this utility model.

[0021] In the picture:

[0022] 1. UV lamp assembly; 2. Submersible jet mixer; 3. Peripheral drive sludge scraper; 4. Vertical paddle mixer; 5. Zone connection port; 6. Perforated aeration assembly; 7. Submersible sludge pump; 8. Water distribution pipe; 9. Baffle plate; 10. Effluent triangular weir plate; 11. Inlet pipe; 12. Acidification zone; 13. Catalyst addition zone; 14. Oxidant addition zone; 15. Photocatalytic reaction zone; 16. Catalyst desorption zone; 17. Coagulation and flocculation reaction zone; 18. Sedimentation zone inlet channel; 19. Sedimentation zone effluent channel; 20. Sedimentation zone; 21. Sludge collection zone; 22. Sludge discharge channel; 23. Walkway. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The present invention will now be described in further detail with reference to the accompanying drawings:

[0025] like Figure 1 , Figure 2As shown, this utility model provides an integrated photocatalytic oxidation system, comprising: a tank, wherein the tank contains sequentially connected acidification zone 12, catalyst addition zone 13, oxidant addition zone 14, photocatalytic reaction zone 15, catalyst desorption zone 16, coagulation and flocculation reaction zone 17, sedimentation zone 20, and sludge collection zone 21; wherein,

[0026] The acidification zone 12, catalyst addition zone 13, and oxidant addition zone 14 are formed at the center of the tank. The acidification zone is connected to the sewage inlet pipe 11. The annular photocatalytic reaction zone 15 is formed around the acidification zone 12, catalyst addition zone 13, and oxidant addition zone 14. The catalyst desorption zone 16, coagulation and flocculation reaction zone 17, sedimentation zone 20, and sludge collection zone 21 are arranged in a ring around the photocatalytic reaction zone 15. The supernatant of the sedimentation zone 20 is discharged through the sedimentation zone outlet channel 19 at the top. The sludge at the bottom of the sedimentation zone 20 enters the sludge collection zone 21 through the peripheral drive sludge scraper 3 and sludge discharge channel 22. The outermost periphery of the tank is provided with a walkway 23.

[0027] Specifically:

[0028] The tank body of this utility model is an integrated carbon steel anti-corrosion tank body or a reinforced concrete structure tank body. The acid adjustment zone 12, catalyst addition zone 13, and oxidant addition zone 14 are integrated at the center of the annular tank body, independently separated but sequentially connected. The acid adjustment zone 12 is equipped with an acid addition system and an online pH monitor. The acid addition system includes a dosing tank, which is connected to the inlet of the acid adjustment zone through a dosing pipeline. The dosing pipeline is equipped with valves and flow meters, etc. The acid addition system adjusts the pH of the wastewater to 3-4, and the added acid is concentrated sulfuric acid or hydrochloric acid. Each of the acid adjustment zone 12, catalyst addition zone 13, and oxidant addition zone 14 is equipped with... A vertical paddle mixer 4 is used to thoroughly mix wastewater and chemicals. A catalyst dosing system is installed in the catalyst dosing zone 13. This system includes a dosing tank connected to the inlet of the catalyst dosing zone via a pipeline equipped with valves and flow meters. The catalyst added is ferrous sulfate. An oxidant dosing system is installed in the oxidant dosing zone 14. This system includes a dosing tank connected to the inlet of the oxidant dosing zone via a pipeline equipped with valves and flow meters. The oxidant added is hydrogen peroxide.

[0029] In this invention, the oxidant addition zone 14 is connected to the photocatalytic reaction zone 15 via a partitioned connection port 5. Multiple ultraviolet lamp groups 1 and multiple submersible jet propellers 2 are arranged in a ring within the photocatalytic reaction zone 15. The multiple submersible jet propellers 2 are located inside the multiple ultraviolet lamp groups 1, enabling the wastewater to circulate and flow within the ring-shaped photocatalytic reaction zone. Preferably, the ultraviolet lamp group 1 is a vertical integrated ultraviolet lamp assembly, which includes a light intensity detection system, a self-cleaning system, an intelligent electrical control box, and a high-efficiency cooling system, allowing for manual operation as needed. The system features automatic or timed backwashing to ensure sufficient light intensity in the reaction system. The number of UV lamp components can be increased or decreased according to treatment requirements. The photocatalytic reaction zone is arc-shaped, allowing for thorough reaction between wastewater and reagents under the hydraulic stirring of the submersible jet mixer. This creates a closed-loop internal circulation within the system, maximizing the effective contact between wastewater, UV lamps, and reagents, thus reducing reagent dosage. An online ORP monitor is installed within the photocatalytic reaction zone, and the entire system is equipped with an intelligent control system to coordinate the start and stop of the dosing system and monitor the stability of the internal oxidizing epoxy environment.

[0030] The catalyst desorption zone 16 of this invention is equipped with an alkali dosing system and an online pH monitor. The alkali dosing system includes a dosing tank, which is connected to the inlet of the catalyst desorption zone via a delivery pipeline. The delivery pipeline is equipped with valves and flow meters, etc. The alkali dosing system adjusts the pH of the wastewater to 6-8. The catalyst desorption zone 16 is equipped with a perforated aeration component 6, which is connected to an external fan. Oxygen is introduced through the perforated aeration component to achieve the oxidation and precipitation of the catalyst.

[0031] The coagulation and flocculation reaction zone 17 of this utility model is divided into two compartments, namely the coagulation reaction zone and the flocculation reaction zone, and a vertical paddle mixer 4 is provided in both the coagulation reaction zone and the flocculation reaction zone.

[0032] The coagulation and flocculation reaction zone 17 of this invention is connected to the sedimentation zone 20 via a top annular sedimentation zone inlet channel 18. A water distribution pipe 8 is installed within the sedimentation zone inlet channel 18. A baffle plate 9 is installed on the side wall of the sedimentation zone 20 below the water distribution pipe 8. After passing through the water distribution pipe, the wastewater is smoothly introduced into the separation layer of the sedimentation zone by the force-reducing effect of the baffle plate, preventing the washing of the bottom sludge. A triangular weir plate 10 is installed at the outlet of the sedimentation zone to ensure stable water flow around the perimeter and prevent short-circuiting. The supernatant of the sedimentation zone 20 is discharged through the top sedimentation zone outlet channel 19. The sludge at the bottom of the sedimentation zone 20 enters the sludge collection zone 21 via a peripheral drive sludge scraper 3 and a sludge discharge channel 22. A submersible sludge pump 7 is installed in the sludge collection zone 21. Furthermore, the peripheral drive sludge scraper in the sedimentation zone 20 is equipped with a limiter at the end of its track, enabling the scraper to move back and forth. A mudguard and sludge pump are installed at the bottom to pump the sludge into the discharge channel, ultimately leading to the sludge collection area. Furthermore, the sedimentation zone adopts a ring-shaped, circumferentially inlet and outlet structure design, improving sludge separation efficiency. This design has a high hydraulic load capacity and can effectively reduce the footprint of the process system.

[0033] like Figure 1 , Figure 2 As shown, based on the above-mentioned photocatalytic oxidation system integration device, the industrial wastewater treatment method of this utility model includes:

[0034] Step 1: The pretreated industrial wastewater (coarse and fine screens and primary sedimentation, etc.) is pumped through the inlet pipe 11 to the central acidification zone 12. In the acidification zone 12, sulfuric acid or hydrochloric acid is added through an acid dosing device and linked to a pH meter to adjust the pH of the wastewater to between 3 and 4, forming acidic wastewater. Then, the acidic wastewater flows by gravity into the catalyst dosing zone 13, where the catalyst and acidic wastewater are mixed evenly to form the first mixed wastewater. The mixed wastewater then flows by gravity or is pumped into the oxidant dosing zone 14, where oxidant is added to initially establish an oxidation-reduction environment. The acidification zone 12, catalyst dosing zone 13, and oxidant dosing zone 14 are located at the center of the entire device. In the acidification zone 12, catalyst dosing zone 13, and oxidant dosing zone 14, the agents and wastewater are thoroughly mixed by the stirring action of the vertical paddle mixer 4 to ensure uniform mixing of the agents, forming the second mixed wastewater.

[0035] Step 2: The second mixed wastewater enters the outer annular photocatalytic reaction zone 15 through the partitioned connecting port 5. The annular photocatalytic reaction zone 15 is equipped with multiple ultraviolet lamp groups 1 and multiple submersible flow promoters 2, preferably located inside the multiple ultraviolet lamp groups 1. The ultraviolet lamp groups 1 emit strong, high-energy ultraviolet light, and the submersible flow promoters 2 facilitate the circulation of the second mixed wastewater within the annular photocatalytic reaction zone 15, enhancing the mixing effect of the reagents and light, and intensifying the reaction. Through ultraviolet photocatalytic oxidant, the catalyst forms a large number of hydroxyl radicals in an acidic environment, gradually opening and breaking the rings of recalcitrant pollutants in the water, degrading them into small molecule organic matter. COD in the wastewater is efficiently removed in this process.

[0036] Step 3: After the second mixed wastewater has been fully reacted in the photocatalytic reaction zone 15, it enters the catalyst desorption zone 16, which is equipped with a perforated aeration component 6. Alkali solution is added in the catalyst desorption zone 16 through an alkali dosing system to adjust the pH of the wastewater to the range of 6-8, and oxygen is introduced through the perforated aeration component 6 connected to the blower to achieve the oxidation and precipitation of the catalyst.

[0037] Step 4: After the effluent from the catalyst desorption zone 16, it first enters the coagulation and flocculation reaction zone 17. The coagulation and flocculation reaction zone 17 is divided into a coagulation reaction zone and a flocculation reaction zone. Vertical paddle mixers 4 are installed in the two reaction zones respectively. PAC is added to the coagulation reaction zone and PAM is added to the flocculation reaction zone for flocculation to form large flocs.

[0038] Step 5: After flocculation, the resulting large-particle mud-water mixture overflows into the sedimentation zone inlet channel 18. Within the sedimentation zone inlet channel 18, the mud-water mixture is evenly distributed into the sedimentation zone 20 outside the photocatalytic reaction zone 15 through the inlet on the annular water distribution pipe 8. The impact of the mud-water mixture on the bottom sludge is reduced by the force-dissipating effect of the baffle plate 9 below the water distribution pipe 8. After entering the sedimentation zone 20, the sludge settles downwards and is then sucked up by the peripheral drive scraper 3. After collection, it flows through the annular sludge discharge channel 22 and finally enters the sludge collection zone 21. The upper part of the clear liquid exits through the sedimentation zone outlet channel 19 and is collected at the outlet, either entering the next unit or being directly discharged, thus achieving the final catalyst separation.

[0039] After being treated by the above system, the COD in the wastewater is removed to a certain extent. At the same time, when it is used as a front-end pretreatment stage, it can effectively improve the B / C ratio in the wastewater, ensuring the effective and stable operation of the subsequent biological system. When it is used as a back-end deep treatment stage, organic matter that is difficult to degrade by the biological system can be removed to the maximum extent after being treated by the strong oxidation system, effectively ensuring that the COD of the effluent meets the standards.

[0040] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A photocatalytic oxidation system integrated device, characterized in that, include: The tank body contains sequentially connected acidification zone, catalyst addition zone, oxidant addition zone, photocatalytic reaction zone, catalyst desorption zone, coagulation and flocculation reaction zone, sedimentation zone and sludge collection zone. The acidification zone, catalyst addition zone, and oxidant addition zone are formed at the center of the tank, and the acidification zone is connected to the sewage inlet pipe; the annular photocatalytic reaction zone is formed around the acidification zone, catalyst addition zone, and oxidant addition zone, and the catalyst desorption zone, coagulation and flocculation reaction zone, sedimentation zone, and sludge collection zone are arranged in a ring around the photocatalytic reaction zone.

2. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The tank body is an integrated carbon steel anti-corrosion tank body or a reinforced concrete structure tank body. The acid adjustment zone, catalyst addition zone and oxidant addition zone are integrated in the center of the annular tank body, which are independently separated but connected in sequence. The acid adjustment zone is equipped with an acid addition system and an online pH monitor. Vertical paddle mixers are installed in the acid adjustment zone, catalyst addition zone and oxidant addition zone. The catalyst addition zone is equipped with a catalyst addition system and the oxidant addition zone is equipped with an oxidant addition system.

3. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The oxidant addition zone is connected to the photocatalytic reaction zone through a partition connection port. Multiple ultraviolet lamp groups and multiple submersible propellers are arranged in a ring within the photocatalytic reaction zone. The multiple submersible propellers are located inside the multiple ultraviolet lamp groups, and the wastewater is circulated and propelled within the ring photocatalytic reaction zone through the multiple submersible propellers.

4. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The catalyst desorption zone is equipped with an alkali dosing system and an online pH monitor. The catalyst desorption zone is also equipped with a perforated aeration component, which is connected to an external fan.

5. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The coagulation and flocculation reaction area is divided into two compartments: a coagulation reaction zone and a flocculation reaction zone. Both the coagulation reaction zone and the flocculation reaction zone are equipped with vertical paddle mixers.

6. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The coagulation and flocculation reaction zone is connected to the sedimentation zone through an annular sedimentation zone inlet channel at the top. A water distribution pipe is provided in the sedimentation zone inlet channel, and a baffle plate is provided on the side wall of the sedimentation zone below the water distribution pipe. A triangular weir plate is provided at the outlet end of the sedimentation zone.

7. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The supernatant in the sedimentation zone is discharged through the sedimentation zone outlet channel at the top, and the sludge at the bottom of the sedimentation zone enters the sludge collection area through the peripheral drive sludge scraper and sludge discharge channel.

8. The photocatalytic oxidation system integration device as described in claim 7, characterized in that, The peripheral drive sludge scraper in the sedimentation zone is equipped with a limiter at the end of its track, which allows the peripheral drive sludge scraper to move back and forth. A mud baffle and a sludge pump are installed at the bottom to pump the sludge into the discharge channel and finally into the sludge collection area.

9. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The sedimentation zone adopts a ring-shaped structure with circumferential inflow and outflow.

10. The photocatalytic oxidation system integration device as described in claim 1, characterized in that, The outermost perimeter of the pool is equipped with walkways.

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