MABR assembly for closed tank body of full underground sewage plant

Abstract

The utility model discloses an MABR (Membrane Aerated Baffled Reactor) assembly for a closed tank body of a full underground sewage plant, which comprises a membrane frame and a plurality of membrane units arranged on the membrane frame, and further comprises an air bag which is fixed at the upper end of the membrane frame, is connected with an air inlet and outlet pipe and is used for filling or discharging air in the air bag, so that the volume of the air bag is increased or reduced; and the counterweight assembly is fixed at the lower end of the membrane frame and is used for increasing the friction force between the MABR assembly and the bottom of the tank body, and when the air in the air bag is exhausted and the volume is reduced, the MABR assembly sinks and is positioned at the bottom of the tank body. According to the MABR assembly for the closed tank body of the full-underground sewage plant, the problems that the MABR assembly in the closed tank body of the full-underground sewage plant is difficult to place and inconvenient to maintain are solved, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to sewage treatment technical field, especially relate to a MABR assembly for the closed pool body of full-underground sewage plant. BACKGROUND

[0002] MABR (membrane aerated biofilm reactor) adopts bubbleless oxygen supply technology of hollow fiber membrane, and the low energy consumption can supply oxygen for microorganisms and also can be used as the carrier of microorganisms to enrich a large number of microorganisms.

[0003] At present, in the core area of domestic first-line and second-line cities, in order to save land and relieve the NIMBY effect, many sewage plants adopt the construction mode of full-underground box girder, and the pool body of the full-underground sewage plant is basically closed to facilitate traffic and meet environmental health requirements, and only the equipment inspection port is left. The siphon effect of the first-line and second-line cities is strong, and the population and industrial scale often exceed the design planning, so the sewage plant also faces the unexpected scale expansion and is forced to upgrade and expand.

[0004] The pool body of the full-underground box girder structure has many beams and columns, and the space at the top of the pool body is limited, and in order to save land, the water depth reaches 8-9 m. It is difficult to stop water for a long time and empty the pool body, and the existing box girder structure cannot be used to build a new pool body.

[0005] In view of the many difficulties faced by the upgrade and expansion of the closed pool body of the full-underground sewage plant, the expansion measures adopted are required to have obvious treatment effect, not to increase the land occupation, to be fast in construction, not to damage the pool body structure during construction, not to stop water and not to empty the pool body. The conventional MABR assembly is the first choice for in-situ expansion of the sewage plant. However, the pool top and the space inside the full-closed pool body are limited, and it is difficult to translate the membrane assembly (about 800 kg in weight and about 2.4 m in height) from the equipment inspection port (about 2 m*3 m in size) to the far end of the inspection port about 6-10 m away without emptying the pool body, and the pool body surface anticorrosive coating needs to be damaged to anchor the MABR assembly. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a MABR assembly for the closed pool body of full-underground sewage plant, and solves the problem of inconvenient maintenance of the MABR assembly in the full-closed pool body.

[0007] Based on the above problems, the technical scheme provided by the utility model is:

[0008] The MABR assembly for the closed pool body of full-underground sewage plant comprises a membrane frame and a plurality of membrane units arranged on the membrane frame, and further comprises:

[0009] An air bag is fixed to the upper end of the membrane frame, and the air bag is connected with an air inlet and outlet pipe to fill or discharge the gas in the air bag, so that the volume of the air bag increases or decreases;

[0010] a counterweight assembly fixed at the lower end of the membrane stand for increasing the friction between the MABR assembly and the bottom of the pool body, when the volume of the air bag is reduced due to the discharge of the gas in the air bag, the MABR assembly sinks and is positioned at the bottom of the pool body.

[0011] In some embodiments, the air bag is fixed to the membrane stand by a plurality of belts.

[0012] In some embodiments, the counterweight assembly includes a plurality of piers fixed at the lower end of the membrane stand.

[0013] In some embodiments, the piers are cylindrical.

[0014] In some embodiments, the piers are concrete blocks or metal blocks.

[0015] In some embodiments, the membrane stand is a cubic frame structure, the upper part of the membrane stand is provided with a process gas main pipe and a plurality of process gas branch pipes in communication with the process gas main pipe, the lower part of the membrane stand is provided with an exhaust gas main pipe and a plurality of exhaust gas branch pipes in communication with the exhaust gas main pipe, the plurality of process gas branch pipes and the plurality of exhaust gas branch pipes correspond one by one, the upper end of each membrane unit is connected to the process gas branch pipe and the lower end is connected to the exhaust gas branch pipe, and the exhaust gas main pipe is provided with an exhaust gas outlet.

[0016] In some embodiments, the membrane unit includes a first gas bag in communication with the process gas branch pipe, a second gas bag in communication with the exhaust gas branch pipe, and a plurality of membrane units in communication between the first gas bag and the second gas bag.

[0017] In some embodiments, the lower part of the membrane stand is further provided with a scrubbing gas main pipe and a plurality of scrubbing gas branch pipes in communication with the scrubbing gas main pipe.

[0018] In some embodiments, the gas inlet end of the process gas main pipe and the gas inlet end of the scrubbing gas main pipe are arranged at the upper end of the membrane stand.

[0019] In some embodiments, the gas inlet end of the process gas main pipe is connected with a process gas hose, and the gas inlet end of the scrubbing gas main pipe is connected with a scrubbing gas hose.

[0020] The gas bag in the above technical solution refers to a container or pipeline system for storing compressed air, which is used to buffer pressure fluctuations and uniformly distribute gas.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] 1. The MABR assembly is simple to position in a fully enclosed tank body. The MABR assembly is lifted by the buoyancy generated by the air bag, and can be moved to the predetermined position by pushing and pulling. The assembly is fixed at the bottom of the tank body by the friction of the counterweight assembly, without the need to damage the corrosion-resistant coating of the tank body by expansion bolts or other additional fixing measures.

[0023] 2. The MABR assembly is simple to maintain. The assembly is lifted by the buoyancy generated by the air bag, and can be removed by being lifted out after being moved to the equipment access.

[0024] 3. The MABR assembly does not need to be emptied when it is positioned, installed or maintained, and is simple and fast to implement.

[0025] 4. According to the calculation of the increased treatment water quantity and total pollutant quantity required for in-situ expansion of the sewage plant, the number of membrane assemblies can be simply and quickly increased. The original expansion investment is small, the construction period is short, and there is no impact on the existing operation, without the need to add new civil engineering for expansion. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. The drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0027] Figure 1 FIG. 1 is a structural schematic view of the MABR assembly for a fully underground sewage plant enclosed tank body according to the present application;

[0028] Figure 2 FIG. 2 is a structural schematic view of the membrane rack in the embodiment of the present application;

[0029] Among them:

[0030] 1. Membrane rack; 1-1, process gas main pipe; 1-2, process gas branch pipe; 1-3, tail gas branch pipe; 1-4, tail gas main pipe; 1-5, scrubbing gas main pipe; 1-6, scrubbing gas branch pipe;

[0031] 2. Membrane unit; 2-1, first air bag; 2-2, membrane element; 2-3, second air bag;

[0032] 3. Air bag;

[0033] 4. Pile;

[0034] 5. Process gas hose;

[0035] 6. Scrubbing gas hose;

[0036] 7. Inlet and outlet pipe. DETAILED DESCRIPTION

[0037] The above scheme is further described in combination with specific embodiments. It should be understood that these embodiments are used to illustrate the present application and do not limit the scope of the present application. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not mentioned are usually the conditions in conventional experiments.

[0038] As shown in Figure 1 and Figure 2 , it is a structural schematic diagram of an embodiment of the present application, providing a MABR assembly for a closed pool body of a fully-underground sewage plant, comprising a membrane rack 1 and a plurality of membrane units 2 arranged on the membrane rack 1.

[0039] The membrane rack 1 is a cubic frame structure, a process gas main pipe 1-1 and a plurality of process gas branch pipes 1-2 in communication with the process gas main pipe 1-1 are arranged on the upper part of the membrane rack 1, a tail gas main pipe 1-4 and a plurality of tail gas branch pipes 1-3 in communication with the tail gas main pipe 1-4 are arranged on the lower part of the membrane rack 1, the plurality of process gas branch pipes 1-2 and the plurality of tail gas branch pipes 1-4 correspond one by one, the upper end of each membrane unit 2 is connected to the process gas branch pipe 1-2 and the lower end is connected to the tail gas branch pipe 1-4, and a tail gas discharge port is arranged on the tail gas main pipe 1-4.

[0040] In order to facilitate the gas supply of the MABR assembly, the gas inlet end of the process gas main pipe 1-1 and the gas inlet end of the scrubbing gas main pipe 1-5 are arranged at the upper end of the membrane rack 1, a process gas hose 5 is connected to the gas inlet end of the process gas main pipe 1-1, and a scrubbing gas hose 6 is connected to the gas inlet end of the scrubbing gas main pipe 1-5.

[0041] The membrane unit 2 comprises a first gas pocket 2-1 in communication with the process gas branch pipe 1-2, a second gas pocket 2-3 in communication with the tail gas branch pipe 1-3, and a plurality of membrane elements 2-2 in communication between the first gas pocket 2-1 and the second gas pocket 2-3, oxygen is introduced into the process gas branch pipe 1-2 through the process gas main pipe 1-1, and the oxygen enters the plurality of membrane elements 2-2 through the first gas pocket 2-1 to supply oxygen without bubbles, the microorganisms attached to the surface of the membrane wire utilize the oxygen for metabolic action to degrade COD, ammonia nitrogen and total nitrogen.

[0042] In order to facilitate the scrubbing of the membrane assembly at regular intervals, so that the biofilm on the membrane wire maintains a suitable thickness and ensures the efficiency of wastewater biological treatment, a scrubbing gas main pipe 1-5 and a plurality of scrubbing gas branch pipes 1-6 in communication with the scrubbing gas main pipe 1-5 are arranged on the lower part of the membrane rack 1, the gas sprayed through the scrubbing gas branch pipes 1-6 flushes the surface of the membrane wire to reduce pollution.

[0043] In order to facilitate the positioning and maintenance of the MABR assembly in the closed pool body of the fully-underground sewage plant, an air bag 3 is arranged at the upper end of the membrane rack 1, and a counterweight assembly is arranged at the lower end of the membrane rack 1.

[0044] The material of the air bag 3 is corrosion-resistant, aging-resistant rubber, nylon, polyurethane, etc. The air bag 3 is fixed on the upper end of the membrane frame 1 through a plurality of aging-resistant straps or corrosion-resistant buckles. The air bag 3 is connected with an air inlet and outlet pipe 7 for filling or discharging the gas in the air bag 3, so as to increase or reduce the volume of the air bag 3, so as to obtain appropriate buoyancy, and facilitate the movement of the MABR assembly up or down. In order to facilitate the control of the air inlet and outlet pipe 7, a valve can be arranged on the air inlet and outlet pipe 7.

[0045] The counterweight assembly is used to increase the friction between the MABR assembly and the bottom of the pool body. When the gas in the air bag 3 is discharged and the volume is reduced, the MABR assembly sinks and is positioned at the bottom of the pool body. The counterweight assembly includes a plurality of piers 4 fixed on the lower end of the membrane frame 1. Specifically, one pier 4 is arranged on each of the four top corners of the membrane frame 1. The pier 4 is in a cylindrical shape and can be made of concrete blocks or metal blocks. The specific weight and size of the pier 4 are calculated and determined according to the gravity of the membrane assembly and the buoyancy received.

[0046] The process gas hose 5, the scrubbing gas hose 6 and the air inlet and outlet pipe 7 of the air bag 3 are soft hoses without joints. The length is 15-20 m, and the specific length is determined according to the horizontal and vertical distance from the inspection port to the membrane assembly. The material is aging-resistant rubber or corrosion-resistant stainless steel hose.

[0047] The following is a specific calculation example:

[0048] The size of the membrane assembly is about 2.2m*1.1m*2.2m in length, width and height, and the weight is about 720kg. The volume V1 of the air bag depends on the buoyancy F0 it needs to provide. The buoyancy is the total weight of the membrane assembly (membrane assembly + counterweight assembly) G0 minus the buoyancy F1 received by the assembly. For safety, the actual volume V2 of the air bag generates a buoyancy F2 which is 1.5 times the theoretical calculation required buoyancy F0.

[0049] F0=G0-F1.............................(1)

[0050] F1=ρ 水 gV 组件排水 .............................(2)

[0051] F2=1.5F0.............................(3)

[0052] V1=F2 / ρ 水 g………………………………(4)

[0053] The total weight G0 of the membrane module itself gravity G1 plus the gravity G2 of the bottom pier minus the friction F3 caused by the received buoyancy F1 needs to be greater than the water flow thrust F4 received by the membrane module. Through this relationship, the gravity G2 of the pier can be calculated.

[0054] G0 = G1 + G2............................. (5)

[0055] F3 = μ (G0 - F1)............................. (6)

[0056] F3 = η F4............................. (7)

[0057] F4 = 0.5 × C d × p × A × V 2 ............................. (8)

[0058] In addition to considering the balance of horizontal thrust and friction, the moment balance also needs to be considered. The overturning moment is equal to the anti-overturning moment, which is used for verification.

[0059] M 推 = F 推 · h............................. (9)

[0060] M 抗 = F 有效 · L / 2............................. (10)

[0061] M 抗 > M 推 , the box itself can meet the anti-overturning requirements.

[0062] Where, the volume V 组件排水 of the water displaced by the membrane module is about 0.7m 3 , the friction coefficient μ is generally 0.4-0.8, taking 0.5, the safety factor η is taken 2, the resistance coefficient Cd is taken 2, A is the water surface area of the membrane module, V is the water flow velocity, generally 0.2-0.3m / s, the density of concrete is taken 2400kg / m 3 .

[0063] Assuming the water surface area A = 1.1m × 2.2m = 2.42m 2 , the water flow velocity V is 0.3m / s, taking 0.3*1.3 = 0.39m / s under the most unfavorable conditions.

[0064] Then F4 = 0.5 × 2 × 1000kg / m 3 × 2.42m2 x (0.39 m / s) 2 = 368 N;

[0065] F3 = η F4 = 2 * 368 = 736 N

[0066] G1 = 720 * 9.81 = 7063 N

[0067] F1 = 0.7 * 1000 * 9.81 = 6867 N

[0068] G0 = F3 / μ + F1 = 736 / 0.5 + 6867 = 8339 N

[0069] G2 = 8339 - 7063 = 1276 N

[0070] m2 = 1276 / 9.81 = 130 kg

[0071] Each pier 130 / 4 = 33 kg

[0072] Take diameter 250 mm, then height 276 mm, take integer 300 mm.

[0073] F0 = G0 - F1 = 8339 - 6867 = 1472 N

[0074] F2 = 1.5 F0 = 1.5 * 1472 = 2208 N

[0075] Then the air bag gas V1 = F2 / ρg = 2208 / 9.81 / 1000 = 0.23 m 3

[0076] Moment balance check:

[0077] (1) Water flow thrust point height h = 1.1 m (box center):

[0078] M 推 = F 推 · h = F4 · h = 368 * 1.1 = 404.8 N.m

[0079] (2) Anti-overturning moment

[0080] Moment generated by effective weight (leg spacing L = 1.1 m):

[0081] M 抗 = F 有效 · L / 2 = (G0 - F1) · L / 2

[0082] = (8339 - 6867) * 1.1 ÷ 2 = 1472 * 0.55 = 809.6 N.m

[0083] Since M抗 M 推 , the box meets the anti-overturning requirement.

[0084] The working principle of the utility model is:

[0085] When installing, the membrane assembly is carried to the top of the 2m*3m inspection opening by a forklift, and then is put into the full water pool body, and then the air bag is filled by compressed air through the air supply and exhaust pipe, and when the pressure reaches about 30kPa, the air supply is stopped.

[0086] The friction force generated by the weight of the membrane assembly and the counterweight support pier is enough to offset the thrust generated by the water flow on the membrane assembly during operation, so as to ensure that the membrane assembly is stable at the bottom of the pool.

[0087] During operation, the 30-35kPa air provided by the fan passes through the process gas hose, the process gas main pipe and the first air bag in the upper part in turn to provide bubble-free oxygen supply for the membrane element, and the microorganisms attached to the surface of the membrane wire utilize oxygen for metabolic action to degrade COD, ammonia nitrogen and total nitrogen.

[0088] The tail gas that is not utilized passes through the second air bag at the bottom by the tail gas branch pipe into the tail gas main pipe, and is discharged through the tail gas discharge port.

[0089] When the membrane assembly needs to be repaired, the air bag is gradually filled with air to 30kPa through the air supply and exhaust pipe, and the membrane assembly slowly floats to the water surface, and is pushed and pulled to the equipment repair opening by the underwater frogman or robot, and is hung to the pool surface.

[0090] The above examples are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent transformation or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A MABR assembly for a fully underground wastewater treatment plant closed tank, comprising a membrane rack and a plurality of membrane units arranged on the membrane rack, characterized in that, Also included are: an air bag fixed on the upper end of the membrane frame, the air bag being connected with an air inlet and outlet pipe for filling or discharging the gas in the air bag to increase or decrease the volume of the air bag; a counterweight assembly fixed on the lower end of the membrane frame for increasing the friction between the MABR assembly and the bottom of the pool body, when the gas in the air bag is discharged and the volume is reduced, the MABR assembly sinks and is positioned at the bottom of the pool body.

2. The MABR assembly for a fully underground wastewater treatment plant closed tank according to claim 1, characterized in that: The air bag is fixed on the membrane frame by a plurality of straps.

3. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 1, characterized in that: The counterweight assembly includes a plurality of piers fixed on the lower end of the membrane frame.

4. The MABR assembly for a fully underground wastewater treatment plant closed tank according to claim 3, characterized in that: The piers are cylindrical.

5. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 4, characterized in that: The piers are concrete blocks or metal blocks.

6. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin of claim 1, wherein: The membrane frame is a cubic frame structure, the upper part of the membrane frame is provided with a process gas main pipe and a plurality of process gas branch pipes in communication with the process gas main pipe, the lower part of the membrane frame is provided with a tail gas main pipe and a plurality of tail gas branch pipes in communication with the tail gas main pipe, the plurality of process gas branch pipes and the plurality of tail gas branch pipes correspond one by one, the upper end of each membrane unit is connected with the process gas branch pipe and the lower end is connected with the tail gas branch pipe, and the tail gas main pipe is provided with a tail gas outlet.

7. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 6, characterized in that: The membrane unit includes a first gas bag in communication with the process gas branch pipe, a second gas bag in communication with the tail gas branch pipe, and a plurality of membrane elements in communication between the first gas bag and the second gas bag.

8. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 6, characterized in that: The lower part of the membrane frame is also provided with a scrubbing gas main pipe and a plurality of scrubbing gas branch pipes in communication with the scrubbing gas main pipe.

9. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 8, characterized in that: The air inlet end of the process gas main pipe and the air inlet end of the scrubbing gas main pipe are both arranged at the upper end of the membrane frame.

10. The MABR assembly for a fully underground wastewater treatment plant raceway- less basin according to claim 9, characterized in that: The air inlet end of the process gas main pipe is connected with a process gas hose, and the air inlet end of the scrubbing gas main pipe is connected with a scrubbing gas hose.

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