CN2682069Y - Automatic control membrane biological reactor - Google Patents

Abstract

The utility model discloses a self-control membrane bioreactor, which is mainly composed of a reactor box body, a membrane module, a water inlet device, a water outlet device, an aeration device, a membrane pollution control device and an automatic online medicine washing device. During the operation of the reactor, the membrane filament is driven by the membrane pollution control device to make a reciprocating bending movement, so that the filter surface of the membrane filament moves in the treated water to reduce membrane fouling, and the degree of membrane fouling can be judged according to the change of water flux , Automatically execute the online drug washing program to remove membrane pollution. The utility model has simplified operation procedures, good effluent quality, and meets the miscellaneous water reuse standard stipulated by the state. It can be widely used in the treatment of domestic wastewater, catering wastewater and food industry wastewater, and is especially suitable for land resources in short supply and high requirements for sewage treatment. used in the region.

Description

Self-controlled Membrane Bioreactor

1. Technical field

The utility model relates to a membrane bioreactor in sewage treatment, in particular to a self-control membrane bioreactor.

2. Background technology

Membrane bioreactors are widely used in the field of sewage treatment because of their advantages such as small footprint, high volume load, and good effluent quality. However, in all kinds of membrane bioreactors currently developed, the problems of membrane fouling and clogging have not been well resolved. Chinese patent 02205775.7 discloses an "integrated membrane bioreactor", which is composed of a box body, membrane modules, water inlet and outlet pipes, diversion devices, aeration devices and the like. The reactor is divided into an activated sludge reaction area and a membrane separation area. An aeration device is installed in the activated sludge reaction area, and the process of membrane fouling is controlled by the cross-flow of the membrane surface generated by aeration. The pollution gradually deteriorates until the reactor After the normal operation is not possible, the chemical agent soaking method is used to restore the membrane flux. The problems in the practical application of this method are: 1. A higher air-water ratio is required to increase the flow rate on the membrane surface to slow down the deposition and adsorption of pollutants on the membrane surface. In the process of comparison, two energy conversions are required, and the energy loss is large and the utilization rate is low; 2. The flux per unit membrane area is low. The flux per unit membrane area of the reactor is generally only 5-10L/m ² ·h (under 0.03Mpa). Due to the low efficiency of gas-liquid flushing, high energy consumption, and difficulty in effectively removing membrane fouling, the amount of treated water per unit membrane area is small, resulting in increased membrane costs. 3. The membrane chemical soaking operation is complicated, labor-intensive and time-consuming, and affects the continuous operation of the reactor and causes secondary pollution, so industrial application is difficult to realize.

3. Contents of the invention

The purpose of the utility model is to provide a self-control membrane bioreactor that can better slow down and eliminate membrane fouling, and at the same time, when the membrane fouling is serious, it can be processed on-line in real time, and the operation procedure is simplified.

The purpose of this utility model is achieved through the following technical solutions. A self-controlled membrane bioreactor, which includes a reactor box, a membrane module, a water inlet device, a water outlet device, and an aeration device. The membrane module is composed of a membrane wire and a water collection pipe. The aeration pipe in the reactor is located below the membrane module in the reactor box, and it is characterized in that it also includes a membrane pollution control device and an automatic online medicine washing device. The membrane pollution control device is composed of a baffle, a bracket and a motor drive device. The bracket Located on both sides of the membrane module in the reactor box, the motor drive device is located on the top of the bracket, the baffle is located in the middle of the membrane filament in the membrane module, and the upper and lower support plates that can move laterally on the bracket are arranged on both sides of the baffle, and the upper support plate is opened. There are strip grooves, symmetrical fixed pulleys on both sides of the bracket, and holes for supporting the upper and lower support plates of the baffle, and connecting rings on both sides of the baffle. The other end is connected to the motor drive device through the fixed pulleys on both sides of the bracket and through the strip groove on the support plate on the baffle; the automatic online medicine washing device is mainly composed of a control box, a liquid level sensor, a cleaning agent storage tank, It consists of a dosing pump, a one-way valve and two electric valves. The liquid level sensor is set above the membrane assembly in the reactor box, the output of the liquid level sensor is connected to the input end of the control box, and the liquid outlet of the cleaning agent storage tank passes through the dosing pump and the one-way valve to the water collection pipe of the membrane assembly An electric valve is installed at the water outlet of the water collection pipe, and the liquid inlet of the cleaning agent storage tank is connected with the water collection pipe at the other end of the membrane module through another electric valve. The dosing pump, two electric valves, and the water inlet device Both the water inlet pump and the water outlet valve are controlled by the control box. The motor driving device in the above-mentioned membrane pollution control device is composed of a motor and a left and right turntable. The left and right turntables are rotated by the motor, and the edges of the left and right turntables are respectively provided with rotating shafts for connecting the driving ropes.

The working principle of the utility model is: when the whole process of the reactor is running, the membrane pollution control device is in the working state at the same time, and its motor drive device drives the baffle plate through the driving rope to make the membrane wire do reciprocating bending movement in the water. On the one hand, it can The gap between the membrane filaments is always in a state of closed and alternating changes, resulting in a relatively strong turbulent flow on the surface of the membrane filaments; The conditions required for the formation of the deposition layer; in addition, the stretching effect of the bending of the membrane filament on the formed deposition layer causes the deposition layer to break and fall off, thus slowing down the formation of pollution. In this method, besides overcoming the frictional resistance during the operation of the device, almost all of the energy consumed by the device acts on the mixed material liquid near the membrane filament and the membrane surface, which improves the utilization rate of energy consumption and the removal efficiency of membrane fouling. The automatic online medicine washing device is controlled by a liquid level sensor installed in the reactor tank, and the influent flow rate is controlled by a liquid flow meter to a set value. With the increase of membrane fouling, the liquid level required for the membrane to maintain flux increases. When the upper limit is exceeded, the control box will automatically shut down the water inlet pump and the water outlet valve, execute the online drug washing program, turn on the drug dosing pump to circulate the cleaning drug solution through the inner cavity of the membrane, remove the organic pollution layer on the inner wall of the membrane, and at the same time pass through the membrane pores. Osmosis, the cleaning liquid penetrates to the outer surface, removes the organic pollution layer on the outer surface, so as to achieve the purpose of decontamination.

Compared with the prior art, the utility model has the beneficial effects as follows: 1. The membrane module is connected with the pollution control device, and the motor drives the membrane wire to perform reciprocating bending motion, so that the membrane wire filter surface moves in the treated water to reduce pollution. Membrane fouling; 2. The system adopts automatic control online chemical washing technology, judges the membrane fouling degree according to the change of water flux, automatically executes the online chemical washing program, removes membrane fouling, realizes automatic control of the process, and simplifies membrane fouling cleaning at the same time 3. The operation mode is easy to realize. Within the range allowed by the mechanical strength of the membrane, the amplitude and frequency of the reciprocating motion of the membrane filament can be adjusted conveniently; 4. Automatic online chemical cleaning makes the chemical cleaning of membrane pollution in the reactor Complete, the medicament itself just can be used for the sterilization and disinfection of water, and the dosage is smaller than chemical immersion method, can not produce secondary pollution; operation to maintain a good level of membrane flux. The effluent quality of the utility model is good, reaching the national miscellaneous water reuse standard, and can be widely used in the treatment of domestic waste water, catering waste water and food industry waste water, and is especially suitable for use in areas where land resources are in short supply and have high requirements for sewage treatment.

4. Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the self-control membrane bioreactor according to the utility model.

Fig. 2 and Fig. 3 are structural schematic diagrams and perspective views of the membrane fouling control device in the utility model.

Fig. 4 is a structural schematic diagram of the automatic online medicine washing device in the utility model.

5. Specific implementation

Below in conjunction with accompanying drawing, the concrete structure of the present utility model is described in further detail.

Referring to Fig. 1, according to the self-controlled membrane bioreactor described in the utility model, it mainly consists of a reactor box, a membrane module, a water inlet device, a water outlet device, an aeration device, a membrane pollution control device and an automatic online medicine washing device Composition, the membrane module is located in the reactor box 13. Referring to Fig. 2 and Fig. 3, the membrane pollution control device is composed of a driving device consisting of a baffle plate 12, a bracket 23, a drive rope 25, a fixed pulley 21, a motor 9, a left rotary disc 7, and a right rotary disc 8. The middle part of the baffle plate 12 is It is ring-shaped, and it is fixed in the middle of the membrane wire in the membrane module. There are two upper and lower support plates 28 on both sides of the baffle plate 12, and a strip groove 30 is opened on the upper support plate; the support 23 is a rectangular frame, and there are two support plates on both sides of the frame A hole 29, the support plate 28 of the baffle passes through the hole 29, and four fixed pulleys 21 are also provided on the frame on both sides of the bracket 23, two of which are fixed on the upper edge of the frame, and the other two are fixed on the two holes. On the frame between 29, driving rope 25 is two nylon ropes, and one end of two nylon ropes 25 is joined with the rotating shaft 26a, 26b of left and right turntable 7,8 edge respectively, and the other end is passed along pulley 21a, 21b respectively. The strip groove 30 of the support plate on the baffle passes through the frame plates on both sides of the support 23 after the pulleys 21c, 21d and joins with the connecting ring 27 fixed on the left and right sides of the baffle. In addition, in order to make the baffle 12 slide freely during reciprocating motion, pulleys 22 are provided at the holes 29 on both sides of the bracket 23 for supporting the upper and lower support plates of the baffle 12 . The automatic cleaning device is composed of a control box 1, a cleaning agent storage tank 3, a dosing pump 15, a one-way valve 5, an electric valve 4, an electric valve 10, and a liquid level sensor 6, and its position structure is shown in Figure 4.

When the self-controlled membrane bioreactor described in the utility model is in operation, the inlet water is lifted by the inlet pump 2, and the flow rate is controlled by a valve 20 and a liquid flow meter 19. The method of constant flow rate is adopted, and the outlet water level difference is determined by the difference between the outlet water flow rate and the inlet water flow rate. The balance of water flow is automatically adjusted. The aeration is carried out by the air pump 18, the aeration pipe 16 is located directly under the membrane module, and the aeration volume is measured and adjusted by the gas flow meter 17. During the whole process of the reactor operation, the pollution control device is always in the working state, the motor 9 drives the turntable 7, 8 to rotate, and the nylon rope 25 connected to the upper rotating shaft 26 of the turntable is connected to the fixed nylon rope 25 through the rotation of the turntable 7, 8 to draw the baffle plate 12 to reciprocate sports. The membrane filaments are made to bend laterally under the action of the baffle 12 to prevent the formation of a deposition layer on the membrane surface.

During the operation of the reactor, the electric valve 10 and the water outlet valve 14 are opened, the electric valve 4 is closed, and the purified water flows out through the water outlet valve 14 . With the increase of membrane fouling, the effluent flow rate decreases, and because the influent flow rate is greater than the effluent flow rate, the liquid level in the reactor rises. When the pollution reaches a certain level, the liquid level touches the liquid level sensor 6, the automatic control circuit in the control box 1 closes the water inlet pump 2, the water outlet valve 14 and the electric valve 10, opens the electric valve 4, and the dosing pump 15, so that the cleaning agent circulates through the membrane. Silk lumen, to achieve online pollution control, thereby restoring the membrane flux. After cleaning, close the electric valve 4 again, open the water inlet pump 2, the water outlet valve 14 and the electric valve 10, and resume the normal operation of the device.

The self-controlled membrane bioreactor of the utility model treats domestic waste water, catering waste water and food industry waste water, and the effluent water quality is good, which can reach the miscellaneous water reuse standard stipulated by the state. At the same time, it has high biodegradation efficiency, low energy consumption, high degree of self-control, convenient operation and maintenance of membrane modules, long service life, small footprint, and easy installation. It is especially suitable for use in areas with scarce land resources and high requirements for sewage treatment.

Claims (3)

1, a kind of self-control type membrane bio-reactor, it comprises reactor casing [13], membrane module, water feed apparatus, discharging device and aerating apparatus, membrane module is made up of film silk [11] and header [24], it is positioned at reactor casing [13], aeration tube in the aerating apparatus [16] is positioned at the below of reactor casing [13] membrane module, it is characterized in that it also comprises a film pollution control device and automatic on-line medicine cleaning device, the film pollution control device is by baffle plate [12], support [23] and motor driver are formed, support [23] is positioned at the both sides of reactor casing [13] membrane module, motor driver is positioned at the top of support [23], baffle plate [12] is arranged in the middle part of membrane module film silk [11], baffle plate [12] both sides are provided with can go up the upper and lower support plate [28] of transverse movement at support [23], upper backup pad has bar-shaped trough [30], support [23] both sides are provided with symmetric fixed pulley [21], and have a hole [29] that is used for supporting baffle [12] upper and lower support plate, baffle plate [12] both sides also are provided with shack [27], two ends that drive rope [25] are separately fixed on the shack [27] on baffle plate both sides, and the other end is by the fixed pulley [21] on support [23] both sides, and the bar-shaped trough [30] that passes on baffle plate [12] upper backup pad is connected with motor driver; Automatic on-line medicine cleaning device is mainly by controlling box [1], liquid level sensor [6], cleaning agent storage tank [3], dosing pump [15], check valve [5], motorized valve [4] and motorized valve [10] are formed, liquid level sensor [6] is arranged on the top of the interior membrane module of reactor casing [13], the output of liquid level sensor [6] and controlling box [1] input terminus join, the liquid outlet of cleaning agent storage tank [3] links to each other with the header [24a] of membrane module with check valve [5] by a dosing pump [15], the water outlet of header [24a] is provided with motorized valve [10], the liquid inlet of cleaning agent storage tank [3] links to each other motorized valve [4] by a motorized valve [4] with the other end header [24b] of membrane module, motorized valve [10], intake pump [2] and the outlet valve [14] in the discharging device in dosing pump [15] and the water feed apparatus are controlled by controlling box [1].

2, according to the described self-control type membrane bio-reactor of claim 1, it is characterized in that motor driver is made up of motor [9], left and right sides rotating disk [7], [8] in the above-mentioned film pollution control device, left and right sides rotating disk [7], [8] are by motor [9] driven rotary, and its edge is respectively equipped with and is used for connecting the rotating shaft [26] that drives rope [25].

3,, it is characterized in that the hole [29] that support [23] both sides are used for supporting baffle [12] upper and lower support plate locates to be provided with pulley [22] according to claim 1 and 2 described self-control type membrane bio-reactors.

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