A wave-shaped vibration membrane bioreactor

Abstract

The present invention discloses a waveform vibration membrane bioreactor, comprising: a reactor, a static horizontal membrane assembly, a vibrating waveform membrane assembly, a vibration assembly, a motor, a crankshaft connecting rod and a connecting rod arm; a static horizontal membrane assembly is vertically fixed in the reactor, and a vibrating waveform membrane assembly is respectively provided on both sides. The vibration assembly is used to connect two waveform membrane assemblies, the top of the vibration assembly is connected to the crankshaft connecting rod, the crankshaft connecting rod passes through the reactor cover and is connected to the connecting rod arm, and the motor is connected to the connecting rod arm and drives the crankshaft connecting rod to reciprocate up and down. The vibrating waveform membrane assembly is composed of a plurality of horizontally arranged hollow fiber membranes, and the side surfaces of the membranes are arranged in a sinusoidal shape. The advantages of the present invention are: the overall vibration of the membrane assembly is converted into a partial vibration mode, thereby reducing power consumption; the waveform arrangement of the vibrating membrane greatly improves the membrane pollution control effect, and can realize the self-cleaning effect of the membrane; the vibrating waveform membrane assembly has a high water production flux, which can realize the rapid concentration of pollutants in sewage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a waveform vibration type membrane bioreactor. Background Art

[0002] my country has a large population and huge domestic sewage production. Wastewater treatment and resource recovery at the same time have become an important manifestation of current sustainable development and an important strategy to solve resource and energy shortages. Anaerobic biological treatment technology can not only convert organic matter into recyclable energy methane, but also reduce the operating costs of sewage treatment plants because the reaction process has no aeration requirements and the sludge production is low. Therefore, anaerobic biological treatment is one of the important processes for various sewage treatments. However, traditional anaerobic biological treatment systems are subject to bottlenecks such as large sludge loss, long reaction time, and poor effluent quality. The anaerobic membrane bioreactor (AnMBR) is a new sewage treatment technology that couples anaerobic digestion with membrane filtration units. It has the unique advantages of smaller footprint, complete biomass retention, higher organic loading rate, bioenergy production capacity and flexibility. It is one of the efficient technologies in the field of urban wastewater management.

[0003] AnMBR is widely used in sewage treatment, such as industrial wastewater, sludge digestion and municipal sewage. AnMBR prevents the loss of bacteria through membrane interception, and some organic matter can also be intercepted during the reaction period and fully degraded, thereby improving the effluent quality. At the same time, AnMBR can greatly shorten the hydraulic retention time, and the smaller reaction volume also saves treatment costs. Municipal sewage has a large volume but a low concentration, requiring a shorter hydraulic retention time, which is difficult to achieve with traditional anaerobic biological treatment technology. AnMBR can be used in the treatment of municipal sewage to prevent sludge loss caused by short hydraulic retention time, and its energy consumption is much lower than that of aerobic processes.

[0004] Although AnMBR is widely used and has outstanding advantages, its own membrane pollution problem, which cannot be ignored, has become a bottleneck restricting this technology. Membrane pollution in membrane bioreactor refers to the phenomenon of membrane blockage, increased membrane filtration resistance and decreased membrane flux caused by the adsorption and deposition of organic or inorganic substances such as suspended solids, microorganisms, organic matter, salt ions, etc. on the membrane surface or in the membrane pores during the membrane filtration process.

[0005] Traditional AnMBR membrane pollution control technology mainly involves aeration back into the reactor to inhibit the deposition of pollutants on the membrane surface through aeration flushing. However, a large part of the aeration energy is dissipated and does not reach the membrane surface to control membrane pollution. At the same time, using self-produced biogas for circulating aeration in AnMBR will lead to its further dissolution in the reactor solution, making the methane autolysis problem that already exists in the biogas energy recovery problem even worse, and indirectly losing and wasting system energy.

[0006] Membrane vibration has been proven to be an effective way to control membrane fouling. It can be used in AnMBR to control membrane fouling by vibrating or oscillating the membrane assembly to increase the shear rate and turbulence on the membrane surface. The commonly used membrane vibration device is the submerged hollow fiber membrane vibration system. Studies have found that arranging the hollow fiber membranes horizontally can better reduce the occurrence of membrane fouling; with the assistance of membrane vibration, the critical flux value is significantly improved, and the vibration system can still significantly reduce fouling even when the concentration of suspended solids in the mixed liquid is high. Importantly, the membrane vibration system can increase the biogas recovery rate and produce minimal dissolved methane, thereby generating more net energy in the wastewater treatment process. Its good performance makes it a promising technology to replace traditional sewage treatment plants as the next generation of resource recovery facilities.

[0007] The existing technology is mainly a vibrating membrane bioreactor, the main feature of which is to vibrate the membrane components in the traditional membrane bioreactor as a whole to achieve the purpose of reducing membrane pollution. The existing technology is as follows:

[0008] Chinese invention patent: A method and device for extending the service life of a sequencing batch membrane bioreactor, application number: CN201610115510.2;

[0009] Chinese utility model patent: a membrane bioreactor membrane assembly, application number: CN201320708972.7;

[0010] Chinese invention patent: Vibrating membrane bioreactor, application number: CN200910026843.8.

[0011] The disadvantages of the above-mentioned prior art are: (1) the membrane assembly is vibrated, the vibrating object has a large mass and high operating energy consumption; (2) the hollow fiber membrane in the membrane assembly has no wave-shaped arrangement design, the turbulence effect generated during vibration is weak, the membrane pollution control effect is poor, and the membrane self-cleaning effect cannot be produced; (3) the effluent flux of all hollow fiber membranes in the membrane assembly is consistent, and it is impossible to achieve high-flux rapid treatment of some membrane assemblies. At the same time, since the COD concentration in municipal sewage is low, it is not conducive to the growth and metabolism of anaerobic microorganisms. The existing invention patents cannot achieve rapid concentration of pollutants in the reactor and strengthen the biological treatment process. Summary of the invention

[0012] The present invention provides a waveform vibrating membrane bioreactor to address the defects of the prior art, such as difficulty in controlling membrane pollution in AnMBR, high operating energy consumption, and difficulty in treating low-intensity wastewater (such as municipal sewage).

[0013] In order to achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0014] A wave-shaped vibration membrane bioreactor comprises: a reactor cover, a reactor shell, a static horizontal membrane assembly, a vibration wave-shaped membrane assembly, a vibration assembly, a motor, a crankshaft connecting rod and a connecting rod arm;

[0015] The upper end of the reactor shell is covered by a reactor cover, and a reactor water inlet and a reactor water outlet are arranged on the side of the reactor shell. A static horizontal membrane assembly is vertically fixed in the reactor shell, and a vibrating corrugated membrane assembly is respectively arranged on both sides of the static horizontal membrane assembly, and the vibrating corrugated membrane assembly is parallel to the static horizontal membrane assembly.

[0016] The vibration assembly is used to connect two vibrating corrugated membrane assemblies. The top of the vibration assembly is connected to a crankshaft connecting rod. The other end of the crankshaft connecting rod passes through the reactor cover and is connected to a connecting rod arm. The motor is powered by an adjustable voltage power supply. The motor is connected to the connecting rod arm and drives the crankshaft connecting rod to reciprocate up and down.

[0017] The static horizontal membrane assembly is composed of a plurality of hollow fiber membranes arranged horizontally. The water outlet of the static horizontal membrane assembly is connected to a peristaltic pump through a pipeline passing through the reactor shell.

[0018] The vibrating corrugated membrane assembly is composed of a plurality of hollow fiber membranes, which are arranged transversely and whose sides are arranged in the shape of a sine curve. The water outlet of the vibrating corrugated membrane assembly is connected to a peristaltic pump through a pipeline passing through the reactor shell.

[0019] Preferably, the adjustable voltage power supply can infinitely adjust the voltage to control the vibration frequency of the vibrating corrugated membrane assembly to a range of 0-4 Hz.

[0020] Preferably, the connecting rod arm can adjust the amplitude range of the vibration component, and the adjustable length is 0.5-2.5 cm.

[0021] Preferably, the static horizontal membrane module has 56 hollow fiber membranes with an effective length of 106 mm.

[0022] Preferably, the vibrating corrugated membrane assembly comprises 110 hollow fiber membranes with an effective length of 84 mm. The definition equation of the sinusoidal arrangement distribution is: , x is the vertical distance, y is the horizontal distance.

[0023] Preferably, water inlets with different set heights are provided on the side of the reactor shell.

[0024] Preferably, the reactor lid is provided with a latex balloon.

[0025] As a preference, the outlet pipes of the static horizontal membrane module and the vibrating corrugated membrane module are respectively connected to a pressure sensor and a flow meter, and the data of the pressure sensor is read and recorded by a data recorder and then presented in the computer software. The data of the flow meter is recorded and converted by a frequency signal transmitter and then presented in the computer software.

[0026] Preferably, when membrane fouling occurs (transmembrane pressure difference, TMP exceeds 50 kPa), the self-cleaning of the static horizontal membrane assembly and the vibrating corrugated membrane assembly can be achieved by vibrating the vibrating corrugated membrane assemblies on both sides at a vibration frequency of 3 Hz or above.

[0027] Compared with the prior art, the advantages of the present invention are:

[0028] Changing the traditional whole membrane assembly vibration to partial membrane assembly vibration and partial static can reduce the mass of the vibrating object, thereby reducing operating power consumption and membrane assembly costs.

[0029] The vibrating corrugated membrane components on both sides are arranged in a corrugated pattern, which greatly improves the membrane fouling control performance, increases the critical membrane flux value, and enables high-flux filtration on both sides, thereby reducing the energy consumption per ton of water production (kWh / m 3 ), while quickly concentrating the organic matter content in the reactor and promoting the growth of microorganisms.

[0030] The wave arrangement of the vibrating wave membrane components on both sides can generate strong turbulence, which is conducive to the desorption of membrane fouling; by increasing the vibration frequency, the self-cleaning effect of membrane fouling can be achieved, reducing the reactor's dependence on chemical cleaning agents, and achieving better membrane fouling control effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the working principle structure of a waveform vibration membrane bioreactor according to an embodiment of the present invention;

[0032] Figure 2 This is a three-dimensional diagram of the structure of a waveform vibration membrane bioreactor according to an embodiment of the present invention;

[0033] Figure 3 It is a three-dimensional diagram of the connection structure of the vibrating corrugated membrane assembly and the vibrating assembly according to an embodiment of the present invention;

[0034] Figure 4 Schematic diagram of the connection structure of the vibrating corrugated membrane assembly and the vibrating assembly according to an embodiment of the present invention;

[0035] Figure 5 This is a three-dimensional diagram of the structure of a static horizontal membrane assembly according to an embodiment of the present invention;

[0036] Figure 6 Schematic diagram of a static horizontal membrane assembly and a vibrating corrugated membrane assembly arranged in parallel in an embodiment of the present invention;

[0037] Figure 7 The graphs of membrane fouling test of the embodiments of the present invention are as follows; (a) is the present invention; (b) is the prior art with two straight lines arranged on both sides;

[0038] Figure 8 This is a diagram showing the effect of self-cleaning achieved by using vibrating corrugated membrane components on both sides and a static membrane component in the middle in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0040] like Figure 1 and 2 As shown, a wave-shaped vibration type membrane bioreactor comprises: a reactor cover 1, a reactor shell 2, a static horizontal membrane assembly 3, a vibration type wave-shaped membrane assembly 4, a vibration assembly 5, a motor 6, a crankshaft connecting rod 7 and a connecting rod arm;

[0041] The upper end of the reactor shell is covered by a reactor cover, and a reactor water inlet 13 and a reactor water outlet 14 are provided on the side of the reactor shell. A static horizontal membrane assembly is erected and fixed in the reactor shell, and a vibrating corrugated membrane assembly is provided on both sides of the static horizontal membrane assembly. The vibrating corrugated membrane assembly is parallel to the static horizontal membrane assembly ( Figure 6 ).

[0042] like Figure 3 and 4 As shown, the vibration assembly is used to connect two vibrating corrugated membrane assemblies. The top of the vibration assembly is connected to a crankshaft connecting rod. The other end of the crankshaft connecting rod passes through the reactor cover and is connected to the connecting rod arm. The motor is powered by an adjustable voltage power supply, and the motor drives the crankshaft connecting rod to reciprocate up and down through the connecting rod arm.

[0043] In this embodiment, the adjustable voltage power supply can infinitely adjust the voltage to control the vibration frequency range of the vibrating corrugated membrane component to be 0-4 Hz (0, 0.5, 1, 2, and 3 Hz are selected as research objects in this embodiment).

[0044] When membrane fouling occurs (transmembrane pressure difference, TMP exceeds 50 kPa), the self-cleaning of static horizontal membrane components and vibrating corrugated membrane components can be achieved through the vibration of the vibrating corrugated membrane components on both sides.

[0045] The connecting rod arm E can adjust the amplitude of the vibration component to a range of 0.5-2.5 cm (2.5 cm is selected as the research object in this embodiment).

[0046] like Figure 5As shown, the static horizontal membrane assembly is composed of a plurality of hollow fiber membranes arranged horizontally. The water outlet of the static horizontal membrane assembly is connected to the peristaltic pump 9 through a pipeline passing through the reactor shell. This embodiment is composed of 56 hollow fiber membranes with an effective length of 106 mm.

[0047] The vibrating corrugated membrane assembly is composed of a plurality of hollow fiber membranes, which are arranged transversely. After the hollow fiber membranes are arranged to form a vibrating corrugated membrane assembly, the sides thereof are arranged in the shape of a sine curve. The water outlet of the vibrating corrugated membrane assembly is connected to the peristaltic pump 9 through a pipeline passing through the reactor housing. This embodiment is composed of 110 hollow fiber membranes with an effective length of 84 mm. The definition equation of the sinusoidal arrangement distribution is , x is the vertical distance, y is the horizontal distance.

[0048] The effluent flux of the static horizontal membrane module and the vibrating corrugated membrane module may be inconsistent. In sewage treatment, the effluent flux of the vibrating membrane module may be higher than that of the static horizontal membrane module, thereby achieving rapid concentration of pollutants in the reactor.

[0049] The effective length, width and height of the reactor shell are 180 cm*155 cm*20.5 cm respectively. Water inlets with different set heights (2 cm, 9 cm and 14.5 cm) are opened on the side of the reactor shell. A latex balloon 10 is set on the reactor cover to maintain the air pressure balance inside the reactor under the anaerobic reaction environment.

[0050] The pipe of the water outlet of the vibrating corrugated membrane module is also connected to a pressure sensor 11 and a flow meter 12, and the pipe of the water outlet of the static horizontal membrane module is connected to another pressure sensor 11 and another flow meter 12. The data of the pressure sensor is read and recorded by the data recorder and then presented in the computer software. The data of the flow meter is recorded and converted by the frequency signal transmitter 15 and then presented in the computer software.

[0051] The working principle of the present invention is: two rows of vibrating corrugated membrane components move up and down to generate vibration, while the static horizontal membrane component in the middle is stationary. Since the vibrating corrugated membrane components are designed with a sinusoidal arrangement, turbulence effects can be generated during vibration to control membrane contamination of the middle membrane component. This realizes the self-cleaning of the AnMBR system and reduces the dependence of the AnMBR on chemical cleaning agents.

[0052] like Figure 7 As shown, 2 g / L bentonite was used as simulated wastewater to carry out membrane pollution test, and it can be seen that the present invention has a better membrane pollution control effect.

[0053] like Figure 8As shown, the present invention was used to conduct specific experiments, and 0.5Hz operation for 2h-3Hz self-cleaning for 15min, 0.5Hz operation for 1.5h-3Hz self-cleaning for 20min, and 0.5Hz vibration for 1h were respectively performed. The vibration frequency can be increased to achieve the self-cleaning effect of membrane pollution.

[0054] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the implementation methods of the present invention, and should be understood that the protection scope of the present invention is not limited to such special statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A waveform vibration membrane bioreactor, characterized in that: include: Reactor cover, reactor housing, static horizontal membrane assembly, vibrating corrugated membrane assembly, vibrating assembly, motor, crankshaft connecting rod and connecting rod arm; The upper end of the reactor shell is covered by a reactor cover, and a reactor water inlet and a reactor water outlet are arranged on the side of the reactor shell. A static horizontal membrane assembly is vertically fixed in the reactor shell, and a vibrating corrugated membrane assembly is respectively arranged on both sides of the static horizontal membrane assembly, and the vibrating corrugated membrane assembly is parallel to the static horizontal membrane assembly; The vibration assembly is used to connect two vibrating corrugated membrane assemblies. The top of the vibration assembly is connected to a crankshaft connecting rod. The other end of the crankshaft connecting rod passes through the reactor cover and is connected to the connecting rod arm. The motor is powered by an adjustable voltage power supply. The motor is connected to the connecting rod arm and drives the crankshaft connecting rod to reciprocate up and down. When membrane contamination occurs, the self-cleaning of the static horizontal membrane assembly and the vibrating corrugated membrane assembly is achieved through the vibration of the vibrating corrugated membrane assembly. The static horizontal membrane assembly is composed of a plurality of hollow fiber membranes arranged horizontally; the water outlet of the static horizontal membrane assembly is connected to the peristaltic pump through a pipeline passing through the reactor shell; The vibrating corrugated membrane assembly is composed of a plurality of hollow fiber membranes, which are arranged transversely and whose sides are arranged in the shape of a sine curve; the water outlet of the vibrating corrugated membrane assembly is connected to a peristaltic pump through a pipeline passing through the reactor shell; The water flux of the static horizontal membrane assembly and the vibrating corrugated membrane assembly are inconsistent. When treating sewage, the water flux of the vibrating membrane assembly is higher than that of the static horizontal membrane assembly. The static horizontal membrane module has 56 hollow fiber membranes with an effective length of 106 mm; The vibrating corrugated membrane assembly is composed of a number of hollow fiber membranes, 110 in number, with an effective length of 84 mm, and the definition equation of the sinusoidal arrangement distribution is a sine formula; The sine formula is , x is the vertical distance, y is the horizontal distance.

2. A waveform vibrating membrane bioreactor according to claim 1, characterized in that: The adjustable voltage power supply can infinitely adjust the voltage to control the vibration frequency of the vibration type corrugated membrane assembly within a range of 0-4 Hz.

3. A waveform vibrating membrane bioreactor according to claim 1, characterized in that: The connecting rod arm can adjust the amplitude range of the vibration component, and the adjustment length is 0.5-2.5 cm.

4. The waveform vibrating membrane bioreactor according to claim 1, characterized in that: Water inlets with different set heights are opened on the side of the reactor shell.

5. The waveform vibrating membrane bioreactor according to claim 1, characterized in that: The reactor lid is provided with a latex balloon.

6. The waveform vibrating membrane bioreactor according to claim 1, characterized in that: The outlet pipes of the static horizontal membrane assembly and the vibrating corrugated membrane assembly are respectively connected to a pressure sensor and a flow meter. The data of the pressure sensor is read and recorded by a data recorder and then presented in the computer software; the data of the flow meter is recorded and converted by a frequency signal transmitter and then presented in the computer software.

7. The waveform vibrating membrane bioreactor according to claim 2, characterized in that: The oscillation frequency of the vibrating corrugated membrane assembly is 1 Hz.

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