Short-process sewage treatment equipment based on MABR (Membrane Aerated Baffled Reactor) membrane

Abstract

The utility model discloses vertical sewage treatment equipment based on an MABR (Membrane Aerated Baffled Reactor) membrane. The vertical sewage treatment equipment comprises a water distribution system, an MABR reaction zone, an MABR membrane component, a gas supply and flushing system, a clear water zone, a backwashing automatic control system, a water production system and a liquid level control system. The sewage treatment system is short in process and simple to operate, compared with other sewage treatment systems, complicated processes and control of an anaerobic zone, an anoxic zone, an aerobic zone, a reflux system and the like are reduced, standard discharge of sewage is realized by only adopting one treatment process of the MABR, the aeration efficiency is 4-5 times of that of a conventional aerator by adopting an MABR bubble-free aeration technology, and the sewage treatment system has the advantages that the sewage treatment system is simple in structure and low in cost. The device is simple in structure and free of a nitrification liquid reflux pump, a sludge reflux pump and a stirrer, equipment investment and energy consumption are greatly reduced, the vertical tank body structural design is adopted, and compared with other integrated equipment, the occupied area is greatly saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, relates to sewage treatment equipment, and in particular to a short-process sewage treatment equipment based on a MABR membrane which ensures effluent quality and has obvious energy-saving effect. Background Art

[0002] Membrane Aerated Biofilm Reactor (MABR) is a treatment process that uses an oxygen-permeable membrane as a carrier and achieves the degradation of pollutants in sewage through a biofilm system attached to and grown on the surface of the carrier. MABR achieves bubble-free aeration and molecular oxygen transfer with its special material properties. Compared with other aeration systems, it greatly improves the oxygen transfer efficiency. However, in actual operation, the gas supplied by the MABR membrane system is directly discharged into the atmosphere or further used for gas mixing of sewage after oxygen transfer. For multiple MABR systems, the gas volume is large, and a large amount of oxygen is not used in the gas after oxygen transfer. Direct discharge causes a large waste of resources; secondly, sewage mixing requires increasing the gas supply pressure, and the gas utilization rate is very low, which is a process that increases energy consumption. In order to further save energy and increase the oxygen transfer efficiency of MABR, a new MABR operation process is needed.

[0003] Conventional integrated sewage treatment equipment requires the design of anaerobic, anoxic, and aerobic processes to achieve nitrogen and phosphorus removal and COD removal, which results in long treatment processes and large footprints. In addition, the large number of equipment also leads to complex control. Secondly, conventional aerobic processes often require aeration, and the aeration process will release wastewater originally present in the wastewater or generated during the treatment process into the atmosphere, causing air pollution.

[0004] For the MABR sewage treatment process, a matching filtration and sedimentation system also needs to be designed. Conventional secondary sedimentation tanks often have sludge leakage, resulting in substandard effluent. Secondly, there are also problems of poor impact resistance and poor sanitary conditions. The use of filtration equipment will lead to increased equipment investment, increased floor space and complicated control.

[0005] Therefore, a short process, easy to control, stable system, small footprint, reliable and safe equipment and operation process are of great significance. Utility Model Content

[0006] The problems to be solved by the utility model include: 1. The current integrated equipment has a long process, many configurations, and complex control; 2. The conventional sedimentation tank has a poor sedimentation effect and poor effluent quality; 3. The conventional sewage treatment equipment has a high energy consumption; 4. The conventional sewage treatment process odor or volatile gases cause air pollution.

[0007] In order to solve the above problems, the utility model provides a short-process sewage treatment equipment based on MABR membrane. The short-process sewage treatment equipment of the utility model has good effluent quality, simple process, less equipment configuration, obvious energy-saving effect, environmental protection and safety, and saves floor space.

[0008] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The utility model provides a short-process sewage treatment equipment based on MABR membrane, which includes a water distribution system, a MABR reaction zone, a MABR membrane assembly, an air supply and flushing system, a clean water zone, a backwashing automatic control system, a water production system and a liquid level control system;

[0010] The MABR membrane fibers in the MABR membrane assembly are arranged horizontally, and the MABR membrane assembly structure is a curtain-type membrane assembly in which the membrane fibers are woven into a mesh;

[0011] The MABR membrane module cleaning includes a backwashing automatic control system and an air supply and flushing system;

[0012] The water inlet of the backwash automatic control system is located at the lower part of the flushing system of the MABR membrane assembly; the liquid level control system includes a pump stop limit gauge and a pump start limit gauge, the pump stop limit gauge is located in the clear water area, the pump start limit gauge is flush with the water inlet of the backwash automatic control system, and the highest point of the backwash automatic control system is higher than the height of the pump stop limit gauge.

[0013] As a preferred solution of the utility model, the short-process sewage treatment equipment is a vertical structure, which includes, from bottom to top, a sedimentation area, a water distribution system, a backwash automatic control system, a MABR area, and a clean water area. The height of the short-process sewage treatment equipment is greater than 4m; the water production system is arranged in the clean water area.

[0014] As a preferred embodiment of the present invention, the spacing between the woven MABR hollow fiber membranes in the MABR membrane assembly is 0.3-0.6 mm.

[0015] As a preferred solution of the utility model, the air supply and flushing system supplies air to the MABR membrane assembly.

[0016] As a preferred solution of the utility model, the air supply and flushing system flushes the MABR membrane assembly at regular intervals.

[0017] As a preferred solution of the utility model, the water inlet of the automatic backwashing control system is arranged in the middle of the MABR area and the flushing system, and the MABR membrane assembly is backwashed at regular intervals.

[0018] As a preferred solution of the utility model, the clean water zone is arranged on the upper part of the MABR zone.

[0019] As a preferred solution of the utility model, it also includes a regulating tank and a mud discharge system, the upper part of the regulating tank is connected to the backwash automatic control system, and the lower part of the regulating tank is connected to the water distribution system; the mud discharge system is arranged below the sedimentation area.

[0020] As a preferred solution of the present invention, a seal is provided on the periphery of the MABR membrane assembly.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1) The utility model has a short process and is easy to operate. Compared with other sewage treatment systems, the utility model reduces the complex processes and controls such as anaerobic zone, anoxic zone and aerobic zone, and return system, and only adopts the MABR treatment process to achieve the standard discharge of sewage.

[0023] 2) The effluent quality of the utility model is good. Compared with the conventional sewage treatment system, the sedimentation effect of the secondary sedimentation tank is poor, the anti-scouring performance is not high, and the effluent quality is poor. The utility model adopts the precision woven MABR membrane as the filtration medium to ensure the effluent quality. Secondly, MABR has the functions of oxygen supply and biofilm, which can realize the deep removal of pollutants and further ensure the treatment effect.

[0024] 3) The utility model has obvious energy-saving effect. Compared with traditional integrated equipment, aeration pipes or aeration plates are usually used for oxygen aeration, and the aeration efficiency is low. Secondly, the system usually needs to be equipped with agitators, nitrification liquid return pumps, sludge return pumps and other equipment, which further increase the energy consumption per ton of water treatment. The utility model adopts MABR bubble-free aeration technology, and the aeration efficiency is 4-5 times that of conventional aerators, and there is no nitrification liquid return pump, sludge return pump, or agitator, which greatly reduces energy consumption.

[0025] 4) The utility model is environmentally friendly and safe. MABR is a bubble-free aeration system. During the sewage treatment process, waste gas or other pollutants will not volatilize through the aeration process to pollute the atmosphere.

[0026] 5) The utility model saves space and adopts a vertical tank structure design, which greatly saves space compared to other integrated equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the utility model.

[0028] Figure 2 It is a schematic diagram of the MABR membrane assembly of the utility model.

[0029] Figure 3 It is a cross-sectional view of the MABR membrane assembly of the present utility model.

[0030] In the figure, 1. reaction tank; 2. sedimentation area; 3. water distribution system; 3-1. water inlet pump; 3-2. pump stop limit gauge; 3-3 pump start limit gauge; 4. MABR reaction area; 4-1. MABR membrane assembly; 4-2. air supply system; 4-3. flushing system; 5. backwashing automatic control system; 6. clean water area; 7. water production system; 8. equalization tank; 9. sludge discharge system. DETAILED DESCRIPTION

[0031] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments.

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings. The words "first", "second", etc. described in the present utility model are set for the convenience of describing the technical solution of the present utility model, and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in the present application can be combined with each other. In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, and multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not have contradictions or conflicts, all of which are within the scope of protection required by the present utility model.

[0033] Example 1

[0034] See also Figure 1 The utility model provides a short-process sewage treatment equipment based on MABR membrane. The short-process sewage treatment equipment 1 includes a water distribution system 3, a MABR reaction area 4, a MABR membrane assembly 4-1, an air supply and flushing system, a clean water area 6, an automatic backwashing control system 5, a water production system 7, a liquid level control system, a regulating tank 8 and a sludge discharge system 9.

[0035] See also Figure 2 and Figure 3 The MABR membrane fibers of the MABR membrane assembly 4-1 are arranged horizontally, and the structure of the MABR membrane assembly 4-1 is a curtain-type membrane assembly in which the membrane fibers are woven into a mesh. A seal (not shown in the figure) is provided at the periphery of the MABR membrane assembly 4-1 and the side seam of the short-flow sewage treatment equipment to prevent sewage from short-flowing into the clean water area through the gap, thereby affecting the effluent water quality.

[0036] The MABR membrane module cleaning includes a backwashing automatic control system 5 and an air supply and flushing system.

[0037] The water distribution system 3 is arranged below the MABR reaction zone 4, and includes a water distribution pipe and a water inlet pump 3-1.

[0038] As an optional solution, the utility model can raise the position of the regulating tank to achieve gravity water inflow, so that the water inlet pump is not needed.

[0039] The air supply and flushing system includes an external air intake pump, an air supply system 4-2 and a flushing system 4-3. The air supply system 4-2 also supplies air to the MABR membrane assembly 4-1.

[0040] The flushing system 4-3 flushes the membrane components of the MABR zone 4 at regular intervals (30-120 minutes).

[0041] The short-process sewage treatment equipment 1 is a vertical structure, which can be circular or square. From bottom to top, it includes a sedimentation area 2, a water distribution area, a backwashing automatic control system 5, a MABR area 4, and a clean water area 6. The height of the short-process sewage treatment equipment is greater than 4m; the water production system 7 is arranged in the clean water area 6.

[0042] The spacing between the woven MABR hollow fiber membranes in the MABR membrane assembly 4-1 is 0.3-0.6 mm. The smaller the spacing, the higher the filtration accuracy and the better the effluent quality; the smaller the spacing, the faster the MABR membrane hangs and the shorter the biological cultivation time. If the spacing is too small, there is a problem of high filtration resistance, which increases the operating energy consumption. Therefore, the utility model sets the spacing between the woven MABR hollow fiber membranes to 0.3-0.6 mm.

[0043] The water inlet of the backwashing automatic control system 5 is located at the lower part of the MABR reaction zone and the water distribution system 3, and the MABR membrane assembly is backwashed at regular intervals (30-120 minutes).

[0044] As an optional solution, the utility model may not use the backwash automatic control system and the liquid level control system, but adopt the periodic start and stop of the back suction pump and the water inlet pump to clean the membrane components of the MABR area.

[0045] The clean water zone 6 is arranged on the upper part of the MABR reaction zone 4 at a distance of 20-30 cm.

[0046] The liquid level control system includes a pump stop limit gauge 3-2 and a pump start limit gauge 3-3. The pump stop limit gauge 3-2 is located in the clean water area. The pump start limit gauge 3-3 and the water inlet of the backwash automatic control system 5 are on the same horizontal line at the same height. The highest point of the backwash automatic control system 5 is higher than the pump stop limit gauge 3-2.

[0047] The upper part of the regulating tank 8 is connected to the backwash automatic control system 5 , and the lower part of the regulating tank 8 is connected to the water inlet pump 3 - 1 ; the mud discharge system 9 is arranged below the sedimentation area 2 .

[0048] Example 2

[0049] This embodiment provides a method for using a short-process sewage treatment equipment based on a MABR membrane, comprising the following steps:

[0050] S1: Sewage enters the treatment device and is evenly distributed through the water distribution system. Then the sewage (or mud-water mixture) passes through the MABR reaction area from bottom to top to degrade pollutants. The MABR reaction area removes most of COD, NH4-N, and TN. At the same time, the MABR reaction area can also intercept SS to further ensure the effluent quality. Finally, the sewage purification is completed, and the purified water enters the clean water area and meets the discharge standards;

[0051] S2: As the sewage treatment proceeds, the MABR membrane module intercepts more and more SS, the water outlet resistance increases, and the liquid level in the backwash automatic control system continues to rise. When it reaches the highest point of the backwash automatic control system, the backwash automatic control system starts, and the sewage (mud and water mixture) in the treatment equipment is discharged to the regulating tank by the backwash automatic control system, and the liquid level in the clear water area decreases;

[0052] S3: When the liquid level in the clear water area of ​​the reaction tank is lower than the pump stop limit gauge, the water inlet pump is turned off, and the water in the clear water area flows in reverse through the MABR membrane assembly to backwash the MABR membrane assembly. At the same time, the flushing aeration system at the bottom of the MABR membrane assembly is operated to flush the MABR membrane assembly; the SS accumulated in the MABR membrane assembly is stripped and cleaned, and the stripped and cleaned SS (or activated sludge in the system) is deposited in the sedimentation area of ​​the reaction tank under the action of gravity;

[0053] S4: When the liquid level in the reaction tank drops to the installation position of the water inlet of the backwash automatic control system, air enters the backwash automatic control system, the backwash automatic control is destroyed, the backwash stops, the water level in the treatment device no longer decreases, and the liquid level reaches the pump start limit point;

[0054] S5: The water inlet pump is started to carry out the sewage treatment process S1;

[0055] S6: After the flushing process lasts for N cycles, the sludge in the sedimentation area is discharged.

[0056] The effluent is based on actual engineering needs. When the effluent requirement of Class A is required, the effluent COD of the short-process sewage treatment equipment of the utility model is 30-40mg / L, SS is less than 10mg / L, ammonia nitrogen is 0.3-1mg / L; TN is 10-14mg / L, TP<0.5mg / L.

[0057] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A short-process sewage treatment equipment based on MABR membrane, characterized in that: The short-process sewage treatment equipment includes a water distribution system, a MABR reaction area, a MABR membrane assembly, an air supply and flushing system, a clean water area, an automatic backwashing control system, a water production system and a liquid level control system; The MABR membrane fibers in the MABR membrane assembly are arranged horizontally, and the MABR membrane assembly structure is a curtain-type membrane assembly in which the membrane fibers are woven into a mesh; The MABR membrane module cleaning includes a backwashing automatic control system and an air supply and flushing system; The water inlet of the backwash automatic control system is located at the lower part of the flushing system of the MABR membrane assembly; The liquid level control system includes a pump stop limit gauge and a pump start limit gauge. The pump stop limit gauge is located in the clear water area. The pump start limit gauge is flush with the water inlet of the backwash automatic control system. The highest point of the backwash automatic control system is higher than the height of the pump stop limit gauge.

2. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The short-process sewage treatment equipment is a vertical structure, which includes, from bottom to top, a sedimentation area, a water distribution system, a backwashing automatic control system, a MABR area, and a clean water area. The height of the short-process sewage treatment equipment is greater than 4m; the water production system is arranged in the clean water area.

3. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The spacing between the woven MABR hollow fiber membrane fibers in the MABR membrane assembly is 0.3-0.6 mm.

4. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The air supply and flushing system supplies air to the MABR membrane assembly.

5. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The air supply and flushing system flushes the MABR membrane assembly at regular intervals.

6. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The water inlet of the backwashing automatic control system is arranged in the middle of the MABR area and the flushing system, and the MABR membrane assembly is backwashed at regular intervals.

7. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: The clean water zone is arranged at the upper part of the MABR zone.

8. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: It also includes a regulating tank and a mud discharge system. The upper part of the regulating tank is connected to the backwash automatic control system, and the lower part of the regulating tank is connected to the water distribution system; the mud discharge system is arranged below the sedimentation area.

9. A short-process sewage treatment equipment based on MABR membrane according to claim 1, characterized in that: A seal is provided on the periphery of the MABR membrane assembly.

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