Baffling pool biological membrane composite sewage treatment device

Abstract

The utility model provides a baffling pool biological membrane composite sewage treatment device, and belongs to the technical field of sewage treatment. The device provided by the utility model solves the problems of incomplete grease removal, poor operation efficiency and the like in the sewage treatment process of the current high-speed service area. The baffling pool biological membrane composite sewage treatment device disclosed by the utility model is designed into a baffling pool form, and six reaction areas are arranged in the baffling pool, so that the retention period of pollutants is prolonged, the reaction time is prolonged, and the treatment effect is improved; and a biological membrane device and an aeration device are arranged in the baffling tank, so that sufficient oxygen is provided for microorganisms, an aerobic-anaerobic-anoxic environment is ensured, and the decomposition of pollutants is facilitated. The device can perform automatic monitoring, feedback and regulation, and can realize efficient degradation of grease while ensuring removal of ammonia nitrogen, CODcr and BOD5. All components of the device are convenient to disassemble and assemble, and the device is low in cost, high in operation efficiency, convenient to popularize and use and beneficial to operation of large and small factories.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to a baffled pool biofilm composite wastewater treatment device. Background Technology

[0002] With the rapid development of highways in my country, highway service areas have been constructed and are now increasingly numerous. However, their wastewater discharge cannot be integrated into the municipal pipe network for unified collection and treatment, making wastewater treatment a growing and urgent problem. Wastewater from highway service areas mainly originates from catering wastewater, toilet drainage, road watering, car washing, hotel room water, landscaping water, and unforeseen water use (pipeline leaks). Among these, catering wastewater and toilet drainage are the primary sources of wastewater requiring treatment. Most highway service areas are located far from residential and industrial areas, and their wastewater discharge characteristics and pollutant composition concentrations differ from those of domestic and industrial wastewater; the pollutant concentrations in highway service area wastewater are generally higher than those of typical domestic wastewater. Wastewater discharge from highway service areas is highly volatile due to weather, season, and time of day, exhibiting a significant unevenness coefficient. Discharge peaks are concentrated on weekends and public holidays, with daytime discharges higher than nighttime discharges, and discharges decreasing during rainy or snowy weather. Meanwhile, service area wastewater contains characteristic pollutants. Toilet wastewater mainly consists of substances with strong biodegradability, while kitchen waste contains large amounts of non-biodegradable substances such as animal and vegetable oils. Therefore, service area wastewater requires targeted wastewater treatment processes or technologies to improve treatment efficiency. Furthermore, highway service areas are generally small in scale, which places certain demands on the scale of wastewater treatment.

[0003] Currently, the high solids and oil content in catering slurries at highway service areas leads to severe clogging of the flotation unit, requiring frequent cleaning and incurring high maintenance costs, significantly impacting processing efficiency. Furthermore, the flotation unit consumes a large amount of electricity, resulting in high operating costs. To address this clogging issue, this invention designs a baffled tank-biofilm device. Solids are removed through biofilm adsorption, while oil is treated by composite oil-degrading bacteria. This device is less prone to clogging, consumes less electricity, and can degrade solids, oils, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, total phosphorus, total nitrogen, and COD. Utility Model Content

[0004] To address the shortcomings of existing technologies in this field, this utility model provides a baffled biofilm composite wastewater treatment device. This device solves the problems of incomplete grease removal and decreased operating efficiency in current wastewater treatment processes at highway service areas.

[0005] To solve the above-mentioned technical problems, the device of this utility model is designed as a baffled pool with six reaction zones, which can increase the pollutant retention period, extend the reaction time, and improve the treatment effect. In addition, a biofilm device and an aeration device are installed in the baffled pool to provide sufficient oxygen for microorganisms, ensuring an aerobic-anaerobic-anoxic environment, which is conducive to the decomposition of pollutants.

[0006] Specifically, this utility model discloses a baffled tank biofilm composite sewage treatment device, which mainly includes a baffled tank component, a biofilm aeration component, and an effluent purification component.

[0007] The baffle assembly includes a baffle tank, an inlet pump, and a return pump. The baffle tank is a rectangular water tank, uniformly divided into six reaction tanks (numbered ① to ⑥). Each of the six reaction tanks is equipped with a baffle plate and a sedimentation plate. Each reaction tank contains one baffle plate, which is an "L"-shaped two-section baffle plate. The first section is perpendicular to the bottom of the baffle tank, and the second section forms a 135° angle with the first section and is parallel to the sedimentation plate. Each reaction tank contains two symmetrically distributed sedimentation plates, which form a 45° angle with the side and bottom edges of the baffle tank. The baffle tank is connected to the inlet pump and the return pump to achieve liquid flow and circulation. Reaction tank ① is connected to both the inlet pump and the return pump, while reaction tanks ⑤ and ⑥ are each connected to a return pump. The baffle tank has one water outlet on top, and each reaction tank has two sludge discharge outlets at the bottom. Reaction tank ⑤ has a sludge return outlet at the bottom, connected to a sludge return pump.

[0008] The biofilm assembly includes a biofilm fixing device and fixing rods; five reaction tanks, numbered ① to ⑤, are equipped with one set of biofilm assemblies in each tank; the fixing rods are two long rods fixed to the baffle plate, and the biofilm fixing device is fixed between the two fixing rods; the biofilm fixing devices are fixed between the two fixing rods in a four-spaced arrangement; the biofilm fixing device is a suspended filamentous packing device with a burr structure on its surface.

[0009] The aeration assembly includes an aeration pump, aeration pipes, and aeration discs. The aeration pipes are connected to the aeration pumps. There are four main pipes located at the top of the baffle assembly. The four main pipes are divided into eight branch pipes. The branch pipes are inserted into reaction tanks ①-④. An aeration disc is connected to the bottom of each branch pipe. Two branch pipes and two aeration discs are set in each reaction tank.

[0010] The water purification assembly includes a tubular ceramic membrane, an outlet, and an outlet pump; the baffle tank (reaction tank ⑥) is connected to the outlet pump, which pumps water into the tubular ceramic membrane for further purification before discharging it through the outlet.

[0011] Preferably, the system also includes water quality monitoring and intelligent control components: pollutant monitoring sensors, pollutant monitoring devices, and pH dosing devices. The pollutant monitoring sensors are installed in reaction tanks ① and ⑥ of the baffled reactor. They automatically monitor pollutants (ammonia nitrogen, COD, total phosphorus, total nitrogen, oil, DO, pH, temperature, etc.) in the baffled reactor. The pollutant monitoring devices primarily monitor various indicators during the biofilm treatment process. The pH dosing device adjusts the pH to create an environment conducive to biofilm reaction, thus forming a closed-loop water quality control system for wastewater treatment.

[0012] Preferably, the baffle assembly further includes a wheeled bracket, and the baffle is mounted on the wheeled bracket.

[0013] Preferably, the biofilm is a biofilm formed by the metabolism of the following microorganisms: shortwave bacilli, aquatic microorganisms, alkali-producing bacilli, Bacillus, paracocci, and other petroleum hydrocarbon degrading microorganisms.

[0014] This invention solves the problems of traditional biological treatment efficiency being limited by changes in leachate quality and quantity, easy clogging of flotation devices, and substandard water quality, thus providing a fundamental guarantee for efficient treatment of landfill leachate.

[0015] The working principle of this utility model's baffled biofilm composite sewage treatment device is as follows:

[0016] Oily landfill leachate (sewage) enters the reactor. The first three tanks of the reactor are first aerated to provide sufficient oxygen to the biofilm device, providing an aerobic-anaerobic-anoxic environment. Aeration is stopped at the back end to provide anoxic and anaerobic environments, so that the sewage is fully purified. The sludge is returned by a return pump to prevent sludge loss. Finally, the water is discharged through a tubular ceramic membrane to ensure that no oil is discharged.

[0017] Step 1: Oily landfill leachate (sewage) is pumped into the reaction device. After the sewage stabilizes, the pH is adjusted to 7.5 ± 0.2 using a pH dosing device based on the pH readings from the pollutant monitoring sensor. Aeration is then initiated by turning on the aeration pump. When the biofilm reaches a certain thickness, oxygen diffusion into the biofilm is restricted, resulting in an aerobic surface and an anaerobic or even anaerobic inner layer, providing an aerobic-anaerobic-anoxic environment. Microorganisms in the biofilm absorb and decompose nitrogen and phosphorus in the water, purifying the sewage and promoting microbial proliferation.

[0018] Step 2: Stop aeration, allow sludge to settle, and simultaneously turn on the sludge return pump to prevent sludge loss. Allow the sludge to flow back to the reactor through the return pump, and discharge sludge from the sludge outlet daily.

[0019] Step 3: Based on the influent and effluent water quality monitoring, monitor the growth of the biofilm, adjust the influent concentration to ensure the reaction rate reaches its maximum, and at the same time form a closed-loop control system for wastewater treatment water quality.

[0020] Step 4: Use a return pump to return the wastewater, and finally discharge the wastewater through an outlet pump and a tubular ceramic membrane.

[0021] The beneficial results of this invention are as follows: This invention is a baffled biofilm composite wastewater treatment device, which can efficiently treat oily landfill leachate (wastewater) injected into the reactor. It uses a box-type three-dimensional reactor, utilizing integrated principles to efficiently control pollutant concentrations through effective circulation of aeration, feeding, recirculation, and effluent. When oily wastewater exhibits problems such as incomplete pollutant removal or failure to meet requirements, the device can autonomously monitor and provide feedback for adjustment. This device is designed to achieve a synergistic treatment mode of anaerobic-anoxic-aerobic processes, ensuring the removal of ammonia nitrogen, CODcr, and BOD5 while simultaneously achieving efficient degradation of oils.

[0022] This invention solves the problems of traditional biological treatment efficiency being limited by changes in leachate quality and quantity, easy clogging of flotation devices, and substandard water quality, thus providing a fundamental guarantee for efficient treatment of landfill leachate.

[0023] The components of this utility model are easy to disassemble and assemble, have low cost, high operating efficiency, are easy to promote and use, and are beneficial to the operation of factories of all sizes. Attached Figure Description

[0024] Figure 1 This is a three-dimensional view of the overall design of the baffled biofilm composite sewage treatment device of this utility model.

[0025] Figure 2 This is a cross-sectional view of the inlet layer of the baffled biofilm composite sewage treatment device of this utility model.

[0026] Figure 3 This is a cross-sectional view of the effluent layer of the baffled biofilm composite sewage treatment device of this utility model.

[0027] Figure 4 This is a schematic diagram of the layout of the biofilm and drainage outlet in the baffled biofilm composite sewage treatment device of this utility model.

[0028] Figure 5 This is a schematic diagram of the aeration device layout of the baffled biofilm composite sewage treatment device of this utility model.

[0029] Figure 6 This is a schematic diagram of the sludge discharge port layout of the baffled biofilm composite sewage treatment device of this utility model.

[0030] Figure 7This is a schematic diagram of the sludge return port layout of the baffled biofilm composite sewage treatment device of this utility model.

[0031] Figure 8 This is a design drawing for water quality monitoring and intelligent control of the baffled biofilm composite sewage treatment device of this utility model.

[0032] Figures 1-8 In the middle: 1. Inlet, 2. Outlet, 3-8 are reaction tanks ①-⑥ respectively, 9. Outlet, 10. Wheel, 11. Return pump, 12. Inlet pump, 13. Support frame, 14. Tubular ceramic purification membrane, 15. Aeration pump, 16. Sludge return port, 17. Aeration disc, 18. Aeration pipe, 19. Outlet pump, 20. Baffle plate, 21. Sedimentation plate, 22. Sludge discharge port, 23. Biofilm device, 24. Biofilm fixing device, 25. Fixing rod, 26. Pollutant monitoring sensor, 27. Pollutant monitor, 28. pH dosing device.

[0033] Figure 9 This is a comparison chart of grease in the influent and effluent of landfill leachate (sewage) in Example 3.

[0034] Figure 10 This is a comparison chart of ammonia nitrogen levels in the influent and effluent of landfill leachate (sewage) in Example 3.

[0035] Figure 11 This is a comparison chart of COD in the influent and effluent of landfill leachate (sewage) in Example 3. Detailed Implementation

[0036] To more clearly illustrate the technical solution of this application, the device of this utility model will be further described below in conjunction with embodiments. Obviously, the structure described below is only one embodiment of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Example 1: As Figure 1-7 The diagram shows a baffled tank biofilm composite wastewater treatment device, which mainly includes a baffled tank component, a biofilm aeration component, and an effluent purification component.

[0038] The baffle tank in the baffle tank assembly is a rectangular water tank measuring 1.2m x 1.2m x 1m, with an operating volume of 1m³. 3 The influent flow rate is set to Q = 50 L / h. The baffle tank is evenly divided into six reaction tanks, each with dimensions of 0.4 m * 0.6 m * 0.75 m. The bottom of the baffle tank is equipped with a wheeled support 13. The support 13 is made of 0.5 m long aluminum and has wheels 10 installed at the bottom for easy movement.

[0039] Each reaction tank (①-⑥) is equipped with baffles 20 and sedimentation plates 21. Each reaction tank contains one baffle 20, which is an L-shaped two-section design. The first section is perpendicular to the bottom of the baffle tank, 1 cm thick, 0.8 m long, and 0.1 m from the tank wall and 0.2 m from the bottom. The second section forms a 135° angle with the first section and is parallel to the sedimentation plate 21, 0.1 m from the sedimentation plate and 0.1 m long. Each reaction tank also has two sedimentation plates 21, each 0.6 m x 0.21 m in size, forming a 45° angle with the side and bottom of the baffle tank. The two sedimentation plates 21 in each reaction tank are symmetrically distributed, each 0.15 m from the side and bottom. The sedimentation plates extend the reaction time and improve the treatment efficiency.

[0040] The baffle tank achieves liquid flow and circulation through inlet pump and return pump; reaction tank ① is connected to inlet pump 12 and return pump 11, reaction tanks ⑤ and ⑥ are each connected to a return pump 11, and reaction tank ⑥ is connected to outlet pump 19. The inlet and outlet water flow rate is set to Q = 50L / h, and the return flow rate is 2Q = 100L / h.

[0041] A water outlet 9 is installed on reaction tank ③, with dimensions of 0.05m in length, 0.1m in width, and 0.3m from the bottom. This outlet allows water to flow from reaction tank ③ to reaction tank ④. Because the water flows sequentially through reaction tanks ① through ⑥ within the baffle system, and reaction tanks ①-③ and ④-⑥ within the same row are interconnected, a water outlet is installed at the intermediate partition to connect reaction tanks ③ and ④.

[0042] The bottom of the baffle tank is equipped with a sludge discharge port 22. Each reaction tank is equipped with two sludge discharge ports 22, each with a diameter of 1.5 cm, located 0.15 m from the side of the device, and 0.3 m apart from each other. The No. 5 reaction tank is equipped with a sludge return port 16, with a diameter of 1.5 cm, located 0.3 m from the side of the device and 0.05 m from each of the two sedimentation plates 21, and connected to the sludge return pump 11.

[0043] The biofilm assembly includes a biofilm fixing device 24 and fixing rods 25. Except for reaction tank ⑥, each reaction tank is equipped with one set. The fixing rods 25 are two long rods fixed to the baffle plate. The biofilm fixing device 24 is fixed between the two fixing rods 25. The biofilm fixing device 24 is 0.55m long, arranged in four rows with a 0.18m interval, 0.1m from the right side wall of each reaction zone. It uses suspended filamentous packing material with a burr-like surface structure, which is conducive to biofilm attachment and growth, and can provide an anaerobic-anoxic-aerobic environment. The fixing rods 25 are two 0.6m long iron rods fixed to the baffle plate 20, arranged with a 0.55m interval. The biofilm is supported by the iron rods, and the baffle plate 20 is used to support the biofilm assembly. The microorganisms used are mainly petroleum hydrocarbon degrading microorganisms such as *Brevundimonas*, *Aquamicrobium*, *Alcaligenes*, *Bacillus*, and *Paracoccus*. The biofilm is formed by the metabolism of the above-mentioned microorganisms.

[0044] The aeration assembly includes an aeration pump 15, located next to the baffle tank device, and a Roots blower with a designed air volume of 2.0 m³ / h. 3 / min. Aeration pipe 18, designed at the top of the device, connects to aeration pump 15 and has 4 main pipes and 8 branch pipes. For reaction tanks ①-④, each has two branch pipes, and each branch pipe is connected to an aeration disc 17 at its bottom. A total of 8 aeration discs are installed in the baffle tank, positioned at the center of the baffle plate 20, 0.15m from each side of the baffle tank. Each aeration disc has an air intake of 0.25L / min and uses microporous aeration discs of model φ215, serving an area of ​​0.25-0.55m². 2 .

[0045] The effluent purification assembly includes a tubular ceramic membrane 24, an outlet 2, and an outlet pump 19. The baffled reaction tank 8 is connected to the outlet pump 19, which pumps water into the tubular ceramic membrane 24 for further purification before discharging it through the outlet 2. The effluent flow rate is set to Q = 50 L / h.

[0046] The device can efficiently treat oily landfill leachate injected into the reactor. Using a box-type three-dimensional reactor, it efficiently controls pollutant concentration through integrated principles, and effectively circulates wastewater through aeration, feeding, recirculation, and effluent. When problems such as incomplete pollutant removal or failure to meet requirements occur in the oily wastewater, the device can autonomously provide feedback and adjust accordingly.

[0047] Example 2: Figure 1-8 The diagram shows a baffled tank biofilm composite wastewater treatment device, which mainly includes a baffled tank component, a biofilm aeration component, and an effluent purification component.

[0048] The baffled tank assembly, biofilm aeration assembly, and effluent purification assembly are the same as in Example 1. The water quality monitoring and intelligent control assembly includes a pollutant monitoring sensor 26, a pollutant monitoring device 27, and a pH dosing device 28. The pollutant monitoring sensor 26 is a highly sensitive probe with an accuracy of 0.1%, installed in reaction tanks ① and ⑥ within the baffled tank assembly, automatically monitoring pollutants (ammonia nitrogen, COD, total phosphorus, total nitrogen, oil, DO, pH, temperature, etc.) in the baffled tank assembly. During operation, based on the pH measured by the pollutant monitoring sensor, the pH is adjusted to 7.5 ± 0.2 using the pH dosing device, and the aeration pump is activated for aeration, which is beneficial for biofilm growth.

[0049] The device can not only efficiently treat oily leachate injected into the reactor, but also provide autonomous feedback and control.

[0050] Example 3: Application of a baffled pool biofilm composite wastewater treatment device

[0051] Taking the treatment experiment conducted in the laboratory as an example, the reaction device in Example 2 was used to carry out the treatment experiment of oily landfill leachate (sewage).

[0052] Comparison of oil and grease in influent and effluent of landfill leachate (sewage) Figure 9 The results showed that after 8 days, the effluent oil concentration was 0, the removal rate reached 100%, the oil influent load was 4.34 mg / L / h, and the average oil removal rate was 4.34 mg / L / h.

[0053] Comparison chart of ammonia nitrogen in influent and effluent of landfill leachate (sewage) Figure 10 The results showed that after 11 days, the concentration of ammonia nitrogen in the effluent was less than 2 mg / L, the removal rate reached 80%, the influent ammonia nitrogen load was 0.19 mg / L / h, and the average ammonia nitrogen removal rate was 0.15 mg / L / h.

[0054] Comparison chart of COD in influent and effluent from landfill leachate (sewage) Figure 11 The results showed that after 8 days, the COD concentration in the effluent was 0, the removal rate reached 100%, the COD influent load was 9.64 mg / L / h, and the average COD removal rate was 9.64 mg / L / h.

Claims

1. A baffled biofilm composite wastewater treatment device, characterized in that, The device includes a baffle tank assembly, a biofilm aeration assembly, and an effluent purification assembly. The baffle assembly includes a baffle tank, an inlet pump, and a return pump. The baffle tank is a rectangular water tank, uniformly divided into six reaction tanks, numbered ① to ⑥. Each of the six reaction tanks is equipped with a baffle plate and a sedimentation plate. Each reaction tank contains one baffle plate, which is an "L"-shaped two-section baffle plate. The first section is perpendicular to the bottom of the baffle tank, and the second section forms a 135° angle with the first section and is parallel to the sedimentation plate. Each reaction tank contains two symmetrically distributed sedimentation plates, which form a 45° angle with the side and bottom edges of the baffle tank. The baffle tank is connected to the inlet pump and the return pump to achieve liquid flow and circulation. Reaction tank ① is connected to both the inlet pump and the return pump, while reaction tanks ⑤ and ⑥ are each connected to a return pump. One water outlet is installed on the baffle tank, and two sludge discharge outlets are installed at the bottom of each reaction tank; a sludge return outlet is installed at the bottom of reaction tank No. 5, which is connected to the sludge return pump; The biofilm aeration assembly includes a biofilm fixing device and fixing rods; five reaction tanks, numbered ① to ⑤, are equipped with one set of biofilm assemblies in each reaction tank; the fixing rods are two long rods fixed to the baffle plate, and the biofilm fixing device is fixed between the two fixing rods; The aeration assembly includes an aeration pump, aeration pipes, and aeration discs. The aeration pipes are connected to the aeration pump. There are four main pipes located at the top of the baffle assembly. The four main pipes are divided into eight branch pipes. The branch pipes are inserted into reaction tanks ①-④. An aeration disc is connected to the bottom of each branch pipe. Each reaction tank ①-④ is equipped with two branch pipes and two aeration discs. The water purification assembly includes a tubular ceramic membrane, an outlet, and an outlet pump; the baffle tank (reaction tank ⑥) is connected to the outlet pump, which pumps water into the tubular ceramic membrane for further purification before discharging it through the outlet.

2. The baffled biofilm composite wastewater treatment device as described in claim 1, characterized in that, It also includes water quality monitoring and intelligent control components: pollutant monitoring sensors, pollutant monitoring devices, and pH dosing devices; the pollutant monitoring sensors are installed in reaction tanks ① and ⑥ of the baffle device.

3. A baffled biofilm composite wastewater treatment device as described in claim 1 or 2, characterized in that, The biofilm fixation device is fixed between two fixing rods, arranged in four spaced intervals; the biofilm fixation device is a suspended filamentous packing device with a burr structure on its surface.

4. The baffled biofilm composite wastewater treatment device as described in claim 3, characterized in that, The biofilm is formed by the metabolism of the following microorganisms: shortwave bacilli, aquatic microorganisms, alkali-producing bacilli, Bacillus, and paracocci.

5. A baffled biofilm composite wastewater treatment device as described in claim 1 or 2, characterized in that, The baffle assembly also includes a wheeled bracket, on which the baffle is mounted.

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