Water quality purifying and maintaining device for black and odorous pollutant-holding pit pond

Abstract

The utility model belongs to the field of water purification, and provides a water quality purification and keeping device for a black and odorous pollutant-holding pit pond, which comprises an MABR membrane system, an MABR-HD membrane system and an air supply component, the air supply component provides air, the MABR membrane system is fixed through a support, the air inlet end of the MABR membrane system is connected with the air supply component, the MABR membrane system aerates oxygen in the air in a bubble-free manner, and the HD membrane system is connected with the air supply component. The MABR-HD membrane system is fixed through a support and located below the MABR membrane system, the gas inlet end of the MABR-HD membrane system is connected with the gas exhaust end of the MABR membrane system and the gas supply component, the gas exhaust end of the MABR-HD membrane system is closed, and the MABR-HD membrane system aerates tail gas of the MABR membrane system in a bubbling mode. According to the utility model, oxygen can be supplied into the water body, the oxygen utilization rate is improved, and pollutants in the water body can be removed.

Description

Technical Field

[0001] This utility model belongs to the field of water purification, specifically relating to a water quality purification and maintenance device for black and odorous sewage ponds. Background Technology

[0002] Ponds, as a form of water body, are widely present in urban and rural environments. Due to factors such as external and internal pollution and water conservancy conditions, many ponds have experienced problems such as water quality deterioration, ecological imbalance, and black and odorous conditions, seriously affecting the quality of life of surrounding residents and the ecological environment. Therefore, the treatment of ponds is of great significance, as it can not only improve water quality and enhance the quality of the ecological environment, but also provide a more livable environment for surrounding residents.

[0003] Because wastewater from township enterprises, domestic sewage, aquaculture wastewater, and surface runoff enters ponds, the pollution of the water bodies far exceeds their self-purification capacity. When oxygen consumption exceeds reoxygenation capacity, the dissolved oxygen in the water body drops sharply, eventually leading to anoxic or hypoxic conditions. At this point, the decomposition of organic matter shifts from an aerobic to an anaerobic process, severely damaging the aquatic ecosystem and causing the water to become black and smelly, resulting in water quality deterioration. The water quality of black and smelly polluted ponds in rural areas is generally below Class V, and its treatment is a complex and lengthy process, roughly divided into three stages: emergency treatment, water quality improvement, and long-term maintenance.

[0004] The current treatment method is to supplement the water body with oxygen and increase the turbulence of the water body in order to improve and maintain water quality. Artificial oxygenation includes chemical oxygenation, biological oxygenation and mechanical oxygenation.

[0005] Chemical aeration increases dissolved oxygen in water by periodically adding chemicals (such as sodium percarbonate and hydrogen peroxide). Mechanical aeration primarily increases dissolved oxygen by using pumps or other mechanical means to supply oxygen-rich water or by continuously replenishing oxygen through effective contact between the water and air. Biological aeration involves planting aquatic plants and phytoplankton to release oxygen into the water through photosynthesis. Artificial aeration is generally used in the second and third stages to maintain an aerobic state, prevent anaerobic decomposition, and accelerate the degradation of organic pollutants. However, simple aeration cannot completely solve water pollution; it is insufficient for removing pollutants such as COD, ammonia nitrogen, and total phosphorus. Furthermore, after treating black and odorous water bodies, the pollution load may increase again, leading to water quality deterioration and recurring black and odorous conditions. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a water quality purification and maintenance device for black and odorous sewage pits, which can supply oxygen to the water body, improve oxygen utilization rate, and remove pollutants from the water body.

[0007] The technical solution of this utility model includes:

[0008] Gas supply components.

[0009] The MABR membrane system connects the air inlet to the air supply unit to aerate the air supplied by the air supply unit without bubbles.

[0010] The MABR-HD membrane system is located below the MABR membrane system. The air inlet of the MABR-HD membrane system is connected to the exhaust end and the air supply component of the MABR membrane system. The exhaust end of the MABR-HD membrane system is closed. The MABR-HD membrane system aerates the air supplied by the air supply component and the exhaust gas of the MABR membrane system with bubbles.

[0011] Furthermore, the MABR membrane system includes several MABR membrane elements, and the MABR-HD membrane system includes several MABR-HD membrane elements.

[0012] Furthermore, the air inlet of the MABR membrane system is connected to the air supply component via a first air pipe, and a first air inlet valve is provided on the first air pipe to control the amount of air entering.

[0013] Furthermore, the inlet of the MABR-HD membrane system and the outlet of the MABR membrane system are connected via a second air pipe. This second air pipe is equipped with a one-way valve, directing the exhaust gas from the MABR membrane system towards the MABR-HD membrane system.

[0014] Furthermore, the air inlet of the MABR-HD membrane system is connected to the air supply component via a third air pipe, which is equipped with a second air inlet valve to control the amount of air entering.

[0015] Furthermore, the gas supply component is a fan.

[0016] The technical solution provided by this utility model has the following advantages compared with the prior art:

[0017] The device of this invention is placed in a pond, and then the air supply component supplies air to the underwater MABR membrane system. The MABR membrane system utilizes a hydrophobic microporous membrane to diffuse oxygen molecules from the air into the water through the membrane pores for bubble-free aeration. Aerobic, anoxic, and anaerobic biological environments are formed near and away from the MABR membrane system, respectively, achieving simultaneous nitrification and denitrification reactions, while simultaneously removing nitrogen, phosphorus, and degrading organic matter. Then, the exhaust gas from the MABR membrane system enters the MABR-HD membrane system, while the air supply component provides air to the MABR-HD membrane system. The exhaust gas from the MABR membrane system reduces the air supply volume of the air supply component, thus reducing energy consumption. The MABR-HD membrane system provides air to the air supply component for bubble aeration, improving water flow and preventing hypoxia and eutrophication in the bottom water. Compared with existing technologies, this invention, through the combination of the MABR membrane system and the MABR-HD membrane system, efficiently oxygenates and diffuses oxygen in the polluted pond while effectively purifying and maintaining water quality, preventing algal blooms and the recurrence of blackening and foul odors in the water.

[0018] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the water purification and maintenance device according to one embodiment of the present invention.

[0021] Figure label:

[0022] 1. MABR membrane system; 2. MABR-HD membrane system; 3. Support; 4. Plug; 5. First air inlet valve; 6. Second air inlet valve; 7. First air pipe; 8. Second air pipe; 9. Third air pipe; 10. Air supply components. Detailed Implementation

[0023] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the technical solution of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this utility model embodiment, MABR membrane system 1 refers to a membrane aeration bioreactor that uses a hydrophobic microporous membrane to diffuse oxygen molecules from the air into the water through the membrane pores for bubble-free aeration. MABR-HD membrane system 2 refers to a high-efficiency oxygenation membrane for river channels, which performs micro-nano bubble aeration, belonging to bubble aeration. It rapidly and efficiently oxygenates the water body, increases the dissolved oxygen content of the water body, and increases the water flow.

[0027] like Figure 1 As shown, this utility model provides a water quality purification and maintenance device for black and odorous sewage pits, comprising:

[0028] Air supply component 10 provides air.

[0029] The MABR membrane system 1 is fixed by the bracket 3. The air inlet of the MABR membrane system 1 is connected to the air supply component 10 to aerate the oxygen in the air supplied by the air supply component 10 without bubbles.

[0030] MABR-HD membrane system 2 is fixed by bracket 3 and located below MABR membrane system 1. The air inlet of MABR-HD membrane system 2 is connected to the exhaust end of MABR membrane system 1 and air supply component 10 respectively. The exhaust end of MABR-HD membrane system 2 is closed. MABR-HD membrane system 2 aerates the air supplied by air supply component 10 and the exhaust gas of MABR membrane system 1 with bubbles.

[0031] When in use, this invention is placed in a pit or pond. The air supply component 10 then supplies air to the underwater MABR membrane system 1. The MABR membrane system 1 utilizes a hydrophobic microporous membrane to diffuse oxygen molecules from the air into the water through the membrane pores for bubble-free aeration. Aerobic, anoxic, and anaerobic biological environments are formed near and away from the MABR membrane system 1, respectively, to achieve simultaneous nitrification and denitrification reactions, while simultaneously removing nitrogen, phosphorus, and degrading organic matter. Then, the exhaust gas from the MABR membrane system 1 enters the MABR-HD membrane system 2. At the same time, the air supply component supplies air to the MABR-HD membrane system 2. The exhaust gas from the MABR membrane system can reduce the air supply volume of the air supply component, thereby reducing energy consumption. The MABR-HD membrane system 2 uses the air supplied by the air supply component for bubble aeration, improving water flow and preventing hypoxia and eutrophication in the bottom water. Compared with existing technologies, this invention combines MABR membrane system 1 and MABR-HD membrane system 2 to efficiently oxygenate and diffuse oxygen in sewage pits and ponds, while effectively purifying and maintaining water quality to prevent algal blooms and the water from turning black and smelly again.

[0032] The arrangement of MABR-HD membrane system 2 at the bottom and MABR membrane system 1 at the top not only enhances the oxygenation of the water body, but also increases the water flow, allowing the biofilm around the upper MABR membrane system 1 to contact the water body more evenly, thereby strengthening the removal of pollutants. The airflow vibration also maintains the biofilm layer at a certain thickness and peels off the aging membrane layer.

[0033] The lack of water flow in black and smelly ponds is a major problem. While the bubble-free aeration method of MABR membrane system 1 allows for efficient oxygenation, the infiltrated oxygen has minimal disturbance to the water, failing to increase flow. The aeration intensity of the lower-layer MABR-HD membrane system 2 increases water flow, which itself homogenizes water quality, thus enhancing pollutant removal. Simultaneously, the water flow caused by lower-layer aeration removes the aging biofilm layer. Therefore, in addition to aeration and oxygenation, MABR-HD membrane system 2 provides these two additional functions.

[0034] The upper MABR membrane system 1 releases oxygen using a bubble-free aeration method, achieving a mass transfer efficiency of over 90%, thus avoiding the loss caused by bubble escaping in traditional aeration. The lower MABR-HD membrane system 2 further utilizes the remaining air, enhancing mass transfer through microbubble aeration, increasing the total oxygen utilization rate to 85%, 25% higher than a single membrane system. This stratified design also creates a gradient dissolved oxygen environment (upper layer DO 6-8 mg / L, lower layer DO 3-5 mg / L), simultaneously promoting nitrification and denitrification reactions, resulting in an ammonia nitrogen removal rate of 95% and a 30% increase in total nitrogen removal rate. A river remediation project showed that this design reduced COD from 100 mg / L to 15 mg / L and increased water transparency from 0.2 meters to 1.2 meters. It is evident that the stratified layout of MABR membrane system 1 and MABR-HD membrane system 2 significantly improves oxygen utilization efficiency.

[0035] The MABR-HD membrane system 2 can be used for rapid and efficient oxygenation of polluted open-air large water bodies such as lakes, rivers, ditches, and ponds.

[0036] Optionally, the other end of the MABR-HD membrane system 2 is sealed by a plug 4.

[0037] In the embodiments provided by the present invention, the MABR membrane system 1 includes a plurality of MABR membrane elements, and the MABR-HD membrane system 2 includes a plurality of MABR-HD membrane elements.

[0038] The number of MABR membrane elements in MABR membrane system 1 is determined by the area and volume of the application scenario; the larger the area, the more elements are required. Similarly, the number of MABR-HD membrane elements in MABR-HD membrane system 2 is also determined by the area and volume of the application scenario.

[0039] In the embodiment provided by the present invention, the air inlet of the MABR membrane system 1 is connected to the air supply component 10 through a first air pipe 7. The first air pipe 7 is provided with a first air inlet valve 5, which controls the amount of air entering.

[0040] The first air inlet valve 5 precisely controls the amount of air entering the MABR membrane system 1. Different wastewater qualities and treatment stages require different amounts of oxygen. By adjusting the first air inlet valve 5, the aeration intensity can be flexibly adjusted according to the actual situation. For example, when the organic matter content in the wastewater is high, appropriately increasing the air intake can provide sufficient oxygen for aerobic microorganisms and accelerate the decomposition of organic matter; while when the wastewater quality is good, reducing the air intake can both meet the basic needs of microorganisms and reduce energy consumption.

[0041] In terms of equipment protection, the first air inlet valve 5 also plays a role in buffering and protection. When the air supply system experiences pressure fluctuations or malfunctions, the first air inlet valve 5 can adjust the air intake in a timely manner to prevent excessive air pressure from damaging the MABR membrane system 1, extend the service life of the membrane elements, and reduce the maintenance and replacement costs of the equipment.

[0042] Air intake control helps maintain stable aeration effects and a suitable environment for microbial growth. Stable aeration conditions enable the microbial community to remain in a relatively stable state, improving the efficiency and quality of wastewater treatment, ensuring the stability of effluent quality, and better meeting environmental discharge requirements.

[0043] In the embodiment provided by the present invention, the air inlet of the MABR-HD membrane system 2 is connected to the exhaust end of the MABR membrane system 1 through a second air pipe 8. The second air pipe 8 is provided with a one-way valve so that the exhaust gas of the MABR membrane system 1 flows to the MABR-HD membrane system 2.

[0044] In terms of airflow control, the one-way valve ensures that air can only flow from MABR membrane system 1 to MABR-HD membrane system 2, avoiding backflow. This one-way flow design allows air to flow orderly along a predetermined path, ensuring the stability and efficiency of the aeration process. When MABR membrane system 1 supplies exhaust gas to MABR-HD membrane system 2, the one-way valve prevents air from flowing back into MABR membrane system 1 from MABR-HD membrane system 2, avoiding uneven aeration and reduced treatment efficiency caused by air backflow.

[0045] Regarding system stability, the one-way valve helps maintain pressure balance throughout the aeration system. It prevents air leakage and system malfunctions caused by abnormal pressure, ensuring stable operation of the air supply system and membrane elements. For example, when the pressure within the MABR-HD membrane system 2 suddenly increases, the one-way valve automatically closes to prevent backflow of air, ensuring system safety and stability.

[0046] Furthermore, the use of check valves can reduce system maintenance costs and workload. It avoids air backflow problems, reduces the probability of membrane element damage and system failure, lowers the frequency of equipment repair and replacement, and improves the operating efficiency and reliability of the wastewater treatment system.

[0047] In the embodiment provided by the present invention, the air inlet of the MABR-HD membrane system 2 is connected to the air supply component 10 through a third air pipe 9. A second air inlet valve 6 is provided on the third air pipe 9 to control the amount of air entering.

[0048] When the MABR membrane system 1 consumes a lot of air and the amount of air delivered to the MABR-HD membrane system 2 through the second air pipe 8 is insufficient, the air supply component 10 can directly supply air to the MABR-HD membrane system 2 through the third air pipe 9 to ensure that its aeration effect is not affected and to ensure the stable operation of the entire wastewater treatment system.

[0049] The dual-supply design (first air pipe 7 and third air pipe 9), combined with a blower and inlet valves, achieves dynamic air volume distribution. The first inlet valve 5 and the second inlet valve 6 can be adjusted independently. Based on water quality parameters (e.g., when ammonia nitrogen concentration > 8 mg / L, the air supply ratio of the third air pipe 9 is automatically increased to 50%), improving system adaptability by 60%. Simultaneously, the third air pipe 9 serves as a backup air supply path, ensuring the reliability and stability of system operation when the air supply from the second air pipe is insufficient.

[0050] The third air pipe 9 allows the MABR-HD membrane system 2 to obtain a more sufficient air supply. In situations where wastewater quality fluctuates significantly or the treatment load is high, the MABR-HD membrane system 2 can obtain more oxygen through the third air pipe 9, further enhancing its ability to treat residual pollutants in the wastewater. For example, in industrial wastewater treatment, when the concentration of organic matter in the wastewater suddenly increases, increasing the air supply through the third air pipe 9 allows the MABR-HD membrane system 2 to function better and improves the removal rate of organic matter.

[0051] By supplying air to the MABR-HD membrane system 2 through the third air pipe 9 and the second air pipe 8, the aeration intensity of the MABR-HD membrane system 2 can be more precisely adjusted. Combined with the control of the second air inlet valve 6, the amount of air entering the MABR-HD membrane system 2 can be flexibly adjusted according to actual treatment needs, optimizing the aeration effect, saving energy, and improving the quality and efficiency of wastewater treatment.

[0052] The installation of a second air inlet valve 6 on the third air pipe 9 brings numerous positive effects. The second air inlet valve 6 can independently control the amount of air entering the MABR-HD membrane system 2 through the third air pipe 9. In conjunction with the first air inlet valve 5, it enables precise control of the aeration intensity of both the MABR membrane system 1 and the MABR-HD membrane system 2, adapting to different wastewater qualities and treatment requirements. For example, when certain pollutants in the wastewater are better suited for treatment under the specific aeration conditions of the MABR-HD membrane system 2, the removal efficiency of these pollutants can be improved by adjusting the second air inlet valve 6 to increase or decrease the air supply.

[0053] From an energy-saving and consumption-reducing perspective, the second air inlet valve 6 prevents excessive air supply. When a large air supply is not required, closing or reducing the second air inlet valve 6 can reduce unnecessary air consumption and lower the energy consumption of the blower. This can significantly reduce operating costs for wastewater treatment systems that operate for extended periods. Taking a large wastewater treatment plant as an example, by properly adjusting the second air inlet valve 6, a significant amount of electricity costs can be saved annually.

[0054] In the embodiments provided by the present invention, the air supply component 10 is a fan.

[0055] In terms of air supply capacity, the blower can provide a stable and sufficient air supply. The blower's air volume and pressure can be precisely adjusted according to the needs of the wastewater treatment system, ensuring that both MABR membrane system 1 and MABR-HD membrane system 2 receive enough air for aeration. Whether it is a small wastewater treatment facility or a large wastewater treatment plant, the blower can provide the corresponding air supply capacity according to the treatment scale, ensuring the normal operation of wastewater treatment.

[0056] From a cost-effectiveness perspective, the operating cost of blowers is relatively low. Compared with some other air supply equipment, blowers consume less energy and are simpler to maintain and service. Blowers have a long service life, generally 10-15 years, reducing equipment replacement costs. At the same time, the price of blowers is relatively reasonable, which, for wastewater treatment projects, can reduce equipment investment costs while ensuring treatment effectiveness.

[0057] In terms of equipment adaptability, the blower can adapt to different working environments. It can be installed indoors or outdoors and can operate normally within a certain range of temperature, humidity, and pressure. In some special wastewater treatment scenarios, such as environments with high temperature, humidity, or corrosive gases, stable operation of the blower can also be ensured by selecting appropriate blower materials and protective measures.

[0058] Furthermore, the operation and control of the blower are relatively convenient. Modern blowers are typically equipped with intelligent control systems that can automatically adjust their operating status based on the operating parameters of the wastewater treatment system. For example, based on feedback signals from dissolved oxygen sensors, the blower's airflow can be automatically adjusted to achieve precise air supply. This not only improves the efficiency and quality of wastewater treatment but also reduces the difficulty and workload of manual operation. Moreover, the blower operates with relatively low noise, minimizing its impact on the surrounding environment and operators.

[0059] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0060] Although embodiments of this utility model have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A device for purifying and maintaining the water quality of black and odorous sewage pits, characterized in that, include: Gas supply component (10); MABR membrane system (1), wherein the air inlet of the MABR membrane system (1) is connected to the air supply component (10) to aerate the oxygen in the air supplied by the air supply component (10) without bubbles; The MABR-HD membrane system (2) is located below the MABR membrane system (1). The air inlet of the MABR-HD membrane system (2) is connected to the exhaust end of the MABR membrane system (1) and the air supply component (10) respectively. The exhaust end of the MABR-HD membrane system (2) is closed. The MABR-HD membrane system (2) aerates the air supplied by the air supply component (10) and the tail gas of the MABR membrane system (1) with bubbles.

2. The water quality purification and maintenance device for black and odorous sewage pits as described in claim 1, characterized in that, The MABR membrane system (1) includes several MABR membrane elements, and the MABR-HD membrane system (2) includes several MABR-HD membrane elements.

3. The water quality purification and maintenance device for black and odorous sewage pits as described in claim 1, characterized in that, The air inlet of the MABR membrane system (1) is connected to the air supply component (10) via a first air pipe (7). The first air pipe (7) is equipped with a first air inlet valve (5) to control the amount of air entering.

4. The water quality purification and maintenance device for black and odorous sewage pits as described in claim 1, characterized in that, The air inlet of the MABR-HD membrane system (2) is connected to the exhaust outlet of the MABR membrane system (1) through a second air pipe (8). A one-way valve is provided on the second air pipe (8) so that the exhaust gas of the MABR membrane system (1) flows to the MABR-HD membrane system.

5. The water quality purification and maintenance device for black and odorous sewage pits as described in claim 1, characterized in that, The air inlet of the MABR-HD membrane system (2) is connected to the air supply component (10) via a third air pipe (9). The third air pipe (9) is equipped with a second air inlet valve (6) to control the amount of air entering.

6. The water quality purification and maintenance device for black and odorous sewage pits as described in claim 1, characterized in that, The gas supply component (10) is a fan.

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