Low-energy-consumption photocatalytic treatment equipment

Abstract

The utility model discloses low-energy-consumption photocatalytic treatment equipment and belongs to the field of water pollution control. The equipment comprises a pretreatment system and a photocatalytic treatment system, the pretreatment system comprises a water storage tank, a pretreatment pond I and a pretreatment pond II, a rapid water quality detection and analysis system is arranged in the water storage tank, a first liquid level meter, a grating and a stirrer are arranged in the pretreatment pond I, and a second liquid level meter, a stirrer and a dosing system are arranged in the pretreatment pond II; the photocatalytic treatment system is integrally mounted on a stainless steel support, the included angle between the stainless steel support and the ground is adjustable, and the photocatalytic treatment system further comprises a heat collecting plate and a photocatalytic reaction set. Low-concentration drugs and personal care products (PPCPs) in a natural water body are subjected to cyclic degradation treatment for multiple times, and meanwhile, natural light can be effectively utilized in the process of the equipment, so that the whole treatment process is energy-saving and environment-friendly.

Description

Technical Field

[0001] This utility model belongs to the field of water pollution control in environmental engineering, specifically relating to a low-energy photocatalytic treatment device for low-concentration pharmaceuticals and personal care products (PPCPs) in urban sewage. Background Technology

[0002] With the rapid development of modern society and the continuous improvement of people's living standards, the use of pharmaceuticals and personal care products (PPCPs) has increased significantly. These substances enter urban wastewater systems through various pathways, such as household drainage, medical wastewater discharge, and industrial wastewater from the pharmaceutical and cosmetic industries. While pharmaceuticals and personal care products are often present in low concentrations in urban wastewater, they can still have potential impacts on the ecological environment and human health.

[0003] Traditional wastewater treatment processes, such as activated sludge and biofilm processes, perform well in treating conventional pollutants, but their effectiveness in removing low concentrations of pharmaceuticals and personal care products is limited. These substances are characterized by complex chemical structures, diverse biological activities, and difficulty in biodegradation, making traditional biological treatment methods ineffective.

[0004] In recent years, photocatalysis, as an emerging advanced oxidation technology, has shown promising application prospects in wastewater treatment. Photocatalysis utilizes semiconductor materials to generate highly oxidizing reactive species, such as hydroxyl radicals (·OH), under light irradiation, which can efficiently degrade various recalcitrant organic compounds. However, existing photocatalytic treatment equipment still faces challenges such as high energy consumption and room for improvement in treatment efficiency when applied to the treatment of low-concentration pharmaceuticals and personal care products in urban wastewater.

[0005] Photocatalysis is an emerging environmentally friendly technology that utilizes the highly oxidizing free radicals generated by semiconductor materials under light irradiation to degrade pollutants. However, existing photocatalytic treatment equipment suffers from high energy consumption when treating low concentrations of pharmaceuticals and personal care products (PPCPs) in natural water bodies. Furthermore, the pretreatment process is crucial for the photocatalytic reaction; it must be sufficiently long, otherwise the treatment efficiency will be significantly affected. Therefore, there is an urgent need for a low-energy photocatalytic treatment device specifically designed for low concentrations of pharmaceuticals and personal care products (PPCPs) in urban wastewater, capable of effectively removing these pollutants while reducing energy consumption to meet the demands of environmental protection and sustainable development. Utility Model Content

[0006] The purpose of this invention is to address the numerous deficiencies and shortcomings in the aforementioned background technology by providing a low-energy photocatalytic treatment device for low-concentration pharmaceuticals and personal care products (PPCPs) in urban sewage. This device can achieve photocatalytic degradation of low-concentration pharmaceuticals and personal care products (PPCPs) in urban sewage by changing the pretreatment process of raw water with different water qualities and making full use of solar energy. It can also be automatically controlled and save energy.

[0007] To achieve the above objectives, the present invention adopts the following design structure and design scheme: a low-energy photocatalytic treatment device, including a pretreatment system and a photocatalytic treatment system.

[0008] Furthermore, the pretreatment system includes a water storage tank, pretreatment pool I, and pretreatment pool II. The water storage tank is equipped with a rapid water quality detection and analysis system. Pretreatment pool I contains a first level gauge, a screen, and a stirrer to remove larger debris and impurities from urban wastewater. Pretreatment pool II contains a second level gauge, a stirrer, and a dosing system, allowing for flocculation and sedimentation by adding flocculants or surfactants when necessary. The bottom of the water storage tank is connected in parallel to pretreatment pool I and pretreatment pool II via valve I, solenoid valve I, and solenoid valve II, respectively. Pretreatment pool I and pretreatment pool II are connected in series via valve II and solenoid valve III. Pretreatment pool I is connected in parallel to pretreatment pool II via solenoid valves IV and V. A drain pipe with a drain valve is located at the bottom of pretreatment pool II. The photocatalytic treatment system is connected in series with the pretreatment system via valve III, an external water pump, a regulating tank, and a three-way valve. The photocatalytic treatment system is also connected in series with the pretreatment system via valve III and the external water pump. Since pretreatment tanks 2 and 3 are connected in both series and parallel, the operation in pretreatment tanks I and II can be determined based on the water quality conditions of the urban sewage. An external water pump draws the water from the pretreatment system into the equalization tank and then into the photocatalytic reaction group. The equalization tank and a three-way valve control the flow rate.

[0009] Furthermore, all of the above valves are installed on the pipeline.

[0010] Furthermore, the top of the water storage tank is equipped with two water inlet pipes, one of which is an external water source inlet pipe, and the other is an inlet pipe for water that does not meet the standards after being treated by the photocatalytic treatment system.

[0011] The photocatalytic treatment system is mounted on a stainless steel support frame with an adjustable angle to the ground. The system also includes a heat-collecting plate and a photocatalytic reaction assembly. The heat-collecting plate is laid on the stainless steel support frame, and the photocatalytic reaction assembly is mounted on the same frame. Each photocatalytic reaction assembly contains one or more photocatalytic reaction tubes. Each tube is a ring-shaped structure made of quartz glass, with a central cavity for inserting an ultraviolet lamp as an auxiliary light source. Liquid can pass through the interlayer inside the ring-shaped quartz glass tube. A thin-film photocatalyst is sprayed onto the lower semicircle of the interlayer inside each tube. The photocatalytic reaction tubes are connected in series. A rapid water quality monitoring and analysis system is installed at the outlet of the last tube in the series. Water that fails to meet the standards is then pumped into a storage tank via an external water pump. The number of photocatalytic reaction units can be increased or decreased according to water quality conditions.

[0012] The heat-concentrating plate can absorb sunlight and reflect heat to the photocatalytic reaction assembly, heating the reaction process when needed.

[0013] Furthermore, the stainless steel bracket can adjust the angle between the photocatalytic reaction assembly and the ground to ensure that the photocatalytic reaction assembly is perpendicular to the sunlight and obtains more light energy.

[0014] Furthermore, after the photocatalytic reaction group has completed the treatment, the water quality of the effluent can be measured to determine whether the water sample should be returned to the storage tank for continuous experiments.

[0015] This invention provides a low-energy photocatalytic treatment device for low-concentration pharmaceuticals and personal care products (PPCPs) in urban wastewater, which has the following advantages compared with the prior art:

[0016] This invention relates to a photocatalytic treatment device for low-concentration pharmaceuticals and personal care products (PPCPs) in urban wastewater. Through a pretreatment system, wastewater can selectively undergo different pretreatment methods, either individually or sequentially, depending on water quality conditions, before entering the photocatalytic treatment system. Within the photocatalytic treatment system, photocatalytic degradation can be carried out using sunlight alone when sunlight intensity is sufficient, or a supplementary light source can be used for continuous and efficient photocatalytic reaction when sunlight intensity is insufficient or at night. Finally, a rapid water quality detection and analysis system is installed at the outlet of the photocatalytic reaction group to determine whether the effluent needs to be returned to the storage tank through pipes and valves for continuous reaction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the pretreatment system of this utility model;

[0018] Figure 2 This is a schematic diagram of the photocatalytic treatment system of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the three photocatalytic reaction tubes connected in series according to this utility model;

[0020] Figure 4 This is a side view of the photocatalytic treatment system of this utility model;

[0021] The labels in the diagram are as follows:

[0022] 1-Water storage tank, 2-Pretreatment tank I, 3-Pretreatment tank II, 4-Valve I, 5-Solenoid valve I, 6-Solenoid valve II, 7-Valve II, 8-Solenoid valve III, 9-Solenoid valve V, 10-Valve III, 11-Solenoid valve IV, 12-Stainless steel bracket, 13-Heat-collecting plate, 14-Photocatalytic reaction group, 15-Photocatalytic reaction tube, 16-Cavity, 17-Outlet, 18-Drain valve, 19-Regulating tank, 20-Three-way valve. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments.

[0024] Example 1: As Figures 1-4 As shown, this low-energy photocatalytic treatment equipment includes a pretreatment system and a photocatalytic treatment system. The pretreatment system includes a water storage tank 1, a pretreatment pool I2, and a pretreatment pool II3. The water storage tank 1 is equipped with a rapid water quality detection and analysis system. The pretreatment pool I2 is equipped with a first level gauge, a screen, and a stirrer. The pretreatment pool II3 is equipped with a second level gauge, a stirrer, and a dosing system. The bottom of the water storage tank 1 is connected in parallel to the pretreatment pool I2 and the pretreatment pool II3 via valve I4, solenoid valve I5, and solenoid valve II6, respectively. The pretreatment pool I2 and the pretreatment pool II3 are connected in series via valve II7 and solenoid valve III8. The pretreatment tank II3 is connected in parallel via solenoid valves IV11 and V9. All valves are installed on pipelines. The water storage tank 1, pretreatment tank I2, and pretreatment tank II3 are connected by pipelines. The photocatalytic treatment system is connected in series with the pretreatment system via valve III10, an external water pump, regulating tank 19, and three-way valve 20. The water to be treated is pumped from the pretreatment system into regulating tank 19 and then into the photocatalytic treatment system via an external water pump. Regulating tank 19 and three-way valve 20 control the flow rate. The top of the water storage tank 1 is equipped with two water inlet pipes. One water inlet pipe is for external water source, and the other water inlet pipe is for water that does not meet the standards after being treated by the photocatalytic treatment system.

[0025] The photocatalytic treatment system is mounted on a stainless steel bracket 12, the angle between the bracket 12 and the ground is adjustable. The photocatalytic treatment system also includes a heat-collecting plate 13 and a photocatalytic reaction group 14. The heat-collecting plate 13 is laid on the stainless steel bracket 12, and the photocatalytic reaction group 14 is installed on the stainless steel bracket 12 with the heat-collecting plate 13. The photocatalytic reaction group 14 contains 10 photocatalytic reaction tubes 15. Each photocatalytic reaction tube 15 is made of quartz glass in a ring shape. The cavity 16 in the middle can be used to insert an ultraviolet lamp as an auxiliary light source. The interlayer inside the ring-shaped quartz glass tube can be filled with liquid. The lower semicircle inside the interlayer of each photocatalytic reaction tube 15 is coated with a thin film photocatalyst. The 10 photocatalytic reaction tubes are connected in series. A rapid water quality monitoring and analysis system is installed at the outlet 17 of the last photocatalytic reaction tube 15 in series. Water that does not meet the standards is pumped into the water storage tank 1 by an external water pump.

[0026] The stainless steel bracket 12 can adjust the angle between the photocatalytic reaction assembly and the ground to ensure that the photocatalytic reaction assembly is perpendicular to the sunlight and obtains more light energy.

[0027] The working process of this utility model is as follows:

[0028] Municipal wastewater containing low concentrations of pharmaceuticals and personal care products (PPCPs) is introduced into storage tank 1. After analysis by a rapid water quality testing and analysis system, the system determines whether the wastewater should be introduced into pretreatment tank I2 / pretreatment tank II3 or directly into the photocatalytic reaction system. The agitator in pretreatment tank I2 is activated, allowing the wastewater to flow out of storage tank 1. Valves I4 and I5 on the pipeline are opened to allow the wastewater to flow into pretreatment tank I2. The wastewater then passes through a screen in pretreatment tank I2 to filter out larger impurities and debris. The effluent flows into pretreatment tank II3 through valves II7 and III8 on the pipeline. Simultaneously, the agitator and dosing device in pretreatment tank II3 are activated to flocculate the wastewater. After the flocculant has fully contacted the wastewater, the agitator is turned off to allow sedimentation. After a certain period, the drain valve 18 on the bottom drain pipe of pretreatment tank II3 is opened to release the sludge from the bottom of pretreatment tank II3. The supernatant is then introduced into the photocatalytic reaction system via an external water pump and valve III10.

[0029] Open valve III10 before the photocatalytic treatment system to allow the wastewater from the pretreatment system to be pumped into the photocatalytic treatment system. Note that the flow rate of the wastewater entering the photocatalytic treatment system is controlled by adjusting the opening of valve III10 and by setting the three-way valve 20 and the regulating tank 19. At the same time, adjust the stainless steel support 12 of the photocatalytic treatment system to keep the photocatalytic reaction group 14 perpendicular to the angle of sunlight. Then, maintain the inflow rate so that the wastewater passes through 10 photocatalytic reaction tubes 15 in sequence (the flow direction of the wastewater in each photocatalytic reaction tube 15 is from bottom to top). When the wastewater has completely passed through one set of photocatalytic reactors (a total of 10 photocatalytic reaction tubes), it is considered that one round of reaction is completed. The rapid water quality detection and analysis system at the effluent 17 of the photocatalytic treatment system is used to confirm whether the effluent water quality meets the standards. If it does, the wastewater can be discharged into subsequent water storage equipment or other devices or discharged. If it does not meet the standards, the wastewater can be returned to the storage tank 1 through the control of pipelines and pumps for continuous reaction until the effluent standards meet the requirements.

[0030] In addition, if there is insufficient sunlight or continuous operation is required at night, the auxiliary light source of the photocatalytic treatment system can be turned on to replace sunlight for the reaction. The remaining steps are the same as those for the reaction when sunlight is used as the light source.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A low-energy photocatalytic treatment device, characterized in that, include: Pretreatment system and photocatalytic treatment system; The pretreatment system includes a water storage tank (1), a pretreatment pool I (2), and a pretreatment pool II (3). The water storage tank (1) is equipped with a rapid water quality detection and analysis system. The pretreatment pool I (2) is equipped with a first level gauge, a grid, and a stirrer. The pretreatment pool II (3) is equipped with a second level gauge, a stirrer, and a dosing system. The bottom of the water storage tank (1) is connected in parallel to the pretreatment pool I (2) and the pretreatment pool II (3) via valve I (4), solenoid valve I (5), and solenoid valve II (6), respectively. The pretreatment pool I (2) and the pretreatment pool II (3) are connected via valve II (7) and... Solenoid valve Ⅲ (8) is connected in series. Pretreatment tank Ⅰ (2) is connected in parallel with pretreatment tank Ⅱ (3) through solenoid valve Ⅳ (11) and solenoid valve Ⅴ (9). Pretreatment tank Ⅱ (3) has a sewage pipe at the bottom and a sewage valve (18) on the sewage pipe. The photocatalytic treatment system is connected in series with the pretreatment system through valve Ⅲ (10), external water pump, regulating tank (19), and three-way valve (20). The water to be treated is pumped from the pretreatment system into regulating tank (19) and then into the photocatalytic reaction group (14) through the external water pump. Regulating tank (19) and three-way valve (20) control the flow rate.

2. The low-energy photocatalytic treatment equipment according to claim 1, characterized in that: The photocatalytic treatment system is mounted on a stainless steel bracket (12), the angle between the stainless steel bracket (12) and the ground is adjustable. The photocatalytic treatment system also includes a heat-collecting plate (13) and a photocatalytic reaction assembly (14). The heat-collecting plate (13) is laid on the stainless steel bracket (12), and the photocatalytic reaction assembly (14) is installed on the stainless steel bracket (12) covered with the heat-collecting plate (13). The photocatalytic reaction assembly (14) contains one or more photocatalytic reaction tubes (15). Each photocatalytic reaction tube (15) 5) The ring structure is made of quartz glass. The cavity (16) in the middle can be used to insert an ultraviolet lamp tube as an auxiliary light source. The interlayer inside the ring quartz glass tube can be filled with liquid. The lower half circle inside the interlayer of each photocatalytic reaction tube (15) is coated with a thin film photocatalyst. The photocatalytic reaction tubes are connected in series. A rapid water quality monitoring and analysis system is set at the outlet (17) of the last photocatalytic reaction tube (15) after series connection. Water that does not meet the standards is pumped into the water storage tank (1) by an external water pump.

3. The low-energy photocatalytic treatment equipment according to claim 1, characterized in that: The top of the water storage tank (1) is equipped with two water inlet pipes. One of the water inlet pipes is the external water source inlet pipe, and the other water inlet pipe is the water inlet pipe for water that does not meet the standards after being treated by the photocatalytic treatment system.

4. The low-energy photocatalytic treatment equipment according to claim 2, characterized in that: The stainless steel bracket (12) can adjust the angle between the photocatalytic reaction group and the ground to ensure that the photocatalytic reaction group is perpendicular to the sunlight and obtains more light energy.

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