CN106474930A - One kind is dispersed into water submerged membrane cell system - Google Patents

Abstract

The invention provides a dispersed water inlet submerged membrane tank system, which includes a membrane tank, a water inlet system, a membrane module arranged inside the membrane tank, a water outlet pipe connected to the membrane module and the water production system, and a water outlet pipe connected The backwash pump, the blowdown pipe connected to the membrane tank, the blowdown tank set on the upper part of the membrane tank, the surface sweeping mechanism set on the upper part of the membrane tank and opposite to the blowdown tank; the blowdown tank is connected to the blowdown pipe; the water inlet system It includes water inlet pipes connected to the water source and the bottom of the membrane tank, water inlet branch pipes connected to the water inlet pipe and the surface cleaning mechanism, and a water inlet regulating valve arranged on the water inlet pipe. The water inlet regulating valve is located between the water inlet branch pipe and the surface cleaning mechanism. between membrane pools. By setting the surface sweeping mechanism and adding a water inlet branch pipe connected to the water inlet pipe, the energy of the water inlet can be fully utilized to sweep the backwash liquid in the membrane pool during backwash, effectively flushing the upper layer of the backwash liquid Pollutants, to avoid stagnation in the membrane tank during the pollution discharge process, so that the membrane tank can be backwashed thoroughly.

Description

A kind of dispersed water-inflow submerged membrane tank system

technical field

The invention relates to a water treatment system, more specifically, to a dispersed water-inflow submerged membrane tank system.

Background technique

Under the double pressure of increasingly serious water pollution and increasingly stringent water quality standards for water supply and drainage, traditional water treatment technologies and processes are difficult to guarantee the quality of effluent water. Membrane treatment can efficiently intercept pollutants in water and greatly improve the quality of effluent water. Therefore, membrane treatment technology is widely used in water treatment processes.

In terms of membrane treatment, the submerged membrane filtration system arranged with hollow fiber membrane modules can save space and reduce investment due to its high packing density. Compared with the pressure membrane filtration system, it is not easy to clog and has low energy consumption. Therefore, submerged filtration systems are used in most membrane filtration.

Although the submerged membrane filtration system has many advantages, there are still many problems in practical engineering applications. Due to the lack of longitudinal scrubbing in the filtration process of the submerged membrane filtration system, the pollutants intercepted by the membrane are easy to deposit on the surface of the membrane to form a filter cake layer, which will pollute the membrane and reduce the water production capacity. Although the daily maintenance air-water backwashing process can clean the membrane surface to a certain extent and restore part of the water production capacity, but as the backwashing process progresses, the liquid level rises and the pollutants float up, and it is easy to discharge the pollutants in the water after the backwashing is over. The secondary deposition on the membrane module reduces the backwash effect. Moreover, due to the high packing density of the membrane, the pollutants are not easy to clean up, which easily makes the membrane cleaning incomplete, resulting in frequent backwashing.

Contents of the invention

The purpose of the present invention is to provide a dispersed water inlet submerged membrane pool system, which can effectively solve the problems of rapid filtration pollution, accumulated pollutants on the surface of the membrane pool and membrane cleaning in the existing submerged membrane pools. Incomplete removal of pollutants leads to deterioration of membrane pool water quality and frequent membrane backwashing.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A dispersed water inlet submerged membrane tank system, including a membrane tank, a water inlet system, a membrane module arranged inside the membrane tank, a water outlet pipe connected to the membrane module and the water production system, a backwash pump connected to the water outlet pipe, The blowdown pipe connected to the membrane tank, the blowdown tank arranged on the upper part of the membrane tank, the surface sweeping mechanism arranged on the upper part of the membrane tank and opposite to the blowdown tank; the blowdown tank is connected to the blowdown pipe;

The water inlet system includes water inlet pipes respectively connected to the water source and the bottom of the membrane tank, water inlet branch pipes respectively connected to the water inlet pipes and the surface cleaning mechanism, and a water inlet regulating valve arranged on the water inlet pipe. The water inlet regulating valve It is located between the water inlet branch pipe and the membrane pool.

After the membrane module has been filtered for a period of time, the accumulation of surface pollutants will reduce the water production capacity of the membrane, and when the water production resistance increases to a certain extent, in order to restore the water production capacity, when the membrane module needs to be cleaned, start the backwash pump, The filtered water of the product water tank is pressurized into the inside of the membrane filament of the membrane module through the backwash pump, and backwashed from the inside to the outside. Sweeping mechanism, water is sprayed from the surface sweeping mechanism to sweep the backwash water of the membrane pool sideways, push all the backwashed pollutants to the sewage discharge tank, and discharge through the sewage discharge tank. The degree of opening and closing of the water inlet regulating valve depends on the actual head loss of the water inlet branch pipe and the water inlet pipe and the intensity of surface cleaning required.

Through the surface sweeping mechanism and adding a water inlet branch pipe connected to the water inlet pipe, the energy of the water inlet is fully utilized to sweep the backwash liquid in the membrane pool during backwash, effectively flushing the upper layer of backwash liquid pollution Substances, to avoid stagnation in the membrane tank during the pollution discharge process, so that the membrane tank can be backwashed thoroughly.

The water production system includes a water production tank, a water production valve respectively connected to the water production tank and a water outlet pipe, and a suction pump for sucking the water filtered by the membrane module into the production water tank.

Further, the level of the sewage discharge tank is higher than the level of the water outlet pipe. The sewage discharge tank can adopt the forms of triangular weir, rectangular weir and the like.

Further, the height difference between the surface cleaning mechanism and the sewage discharge tank is not more than 0.5m.

Further, a filter plate is provided in the membrane pool, and the filter plate divides the membrane pool into a main body of the membrane pool connected up and down and a water distribution tank at the bottom; the water inlet pipe is connected with the water distribution tank at the bottom; There is a filter head connected to the bottom water distribution tank, one end of the membrane module is opposite to the filter head, and the other end of the membrane module is connected to the outlet pipe; the sewage pipe is connected to the main body of the membrane pool connect. The filtered water enters the water distribution tank at the bottom, and is evenly distributed to the membrane module through the filter head, and then enters the main body of the membrane pool. The filter head has both the functions of water intake and air intake.

Further, the dispersed water-inflow submerged membrane tank system also includes an air flushing mechanism for backwashing the membrane modules.

Furthermore, the air flushing mechanism includes an air flushing pipe connected to the water distribution tank at the bottom, an aeration valve, an aeration fan, and an air release valve, and the aeration valve is respectively connected with the air flushing pipe and the aeration fan, The deflation valve is connected with the air flushing pipe. The aeration sub-machine can be replaced by an air compressor, an air pump, etc. with the same function.

When the air flushes the membrane module, start the aeration fan and open the aeration valve, the gas first enters the water distribution tank at the bottom, and then enters the membrane module through the filter head to disturb and wash the membrane. After the air washing is finished, close the aeration valve and aeration fan, and open the purge valve to empty the air in the distribution tank at the bottom.

Further, the dispersed water-inflow submerged membrane tank system further includes a cross-flow flushing pump for cross-flow flushing of the membrane modules, and the cross-flow flushing pump is connected to the bottom water distribution tank.

When cross-flow flushing is required, the cross-flow flushing pump is started, and the cross-flow flushing pump sucks water into the distribution tank at the bottom to perform cross-flow flushing on the membrane module, and the working conditions of surface sweeping in this process are the same as those of water backwashing . Cross-flow flushing can completely eliminate the pollutants remaining in the membrane shell after conventional air-water cleaning, improve cleaning efficiency and reduce backwash frequency.

Further, one end of the cross-flow flushing pump is connected to the bottom distribution tank, and the other end of the cross-flow flushing pump is connected to the produced water tank/water inlet pipe. The water source during cross-flow flushing can be the filtered water of the produced water tank or the water to be filtered to save costs.

Further, the membrane module is provided with a protective membrane shell, and the middle and/or upper part of the protective membrane shell is provided with water and air holes. The incoming water flows upward through the protective membrane casing outside the membrane module, and flows out of the membrane module through the water-passing hole. Therefore, driven by the water inflow, a circulation is formed inside and outside the protective membrane shell, which enhances the erosion of the membrane surface.

Further, the surface cleaning mechanism is a perforated pipe, a distributed flushing mechanism or a channel provided on the membrane pool.

Further, the filter head is a long handle filter head. The long-handled filter head preferably adopts a structure with a large number of slits and small slits.

Compared with prior art, the beneficial effect of the present invention is:

In the present invention, by setting the surface sweeping mechanism and adding a water inlet branch connected to it on the water inlet pipe, the water inlet energy is fully utilized to sweep the backwash liquid in the membrane pool during backwashing, effectively flushing and backwashing The pollutants in the upper layer of the liquid are avoided from staying in the membrane tank during the pollution discharge process, so that the membrane tank can be backwashed thoroughly.

Description of drawings

Fig. 1 is a schematic side view of the dispersed water-inflow submerged membrane tank system described in Example 1.

2 is a schematic top view of the membrane cell described in Example 1.

Fig. 3 is a schematic diagram of the membrane module and the protective membrane case described in Example 1.

detailed description

The present invention will be further described below in combination with specific embodiments. Wherein, the accompanying drawings are only for illustrative purposes, showing only schematic diagrams, rather than physical drawings, and should not be construed as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings will be omitted, Enlargement or reduction does not represent the size of the actual item; for those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings.

Example 1

As shown in Figures 1 to 3, a dispersed water inlet submerged membrane tank system includes a membrane tank, a water inlet system, a membrane module 8 arranged inside the membrane tank, and an outlet pipe 10 connected to the membrane module 8 and the water production tank respectively. , the backwash pump 11 connected with the water outlet pipe 10, the sewage pipe 13 connected with the membrane tank, the sewage tank 9 arranged on the upper part of the membrane tank, the surface sweeping mechanism 3 arranged on the upper part of the membrane tank and opposite to the sewage tank 9, with The air flushing mechanism used for backwashing the membrane module 8 and the cross-flow flushing pump 20 for cross-flow flushing of the membrane module 8.

A filter plate 7 is arranged in the membrane tank, and the filter plate 7 divides the membrane tank into a main body 4 of the membrane tank connected up and down and a water distribution tank 5 at the bottom. The water inlet pipe 1 is connected with the water distribution tank 5 at the bottom. A filter head 6 is arranged on the filter plate 7 , one end of the membrane module 8 is opposite to the filter head 6 , and the other end of the membrane module 8 is connected to the outlet pipe 10 . The filter head 6 is a long-handle filter head, and the long-handle filter head 6 preferably adopts a structure with a large number of gaps and small gaps. The membrane assembly 8 is provided with a protective membrane shell 19, and the middle and upper parts of the protective membrane shell 19 are provided with water and air holes 21.

The water inlet system includes the water inlet pipe 1 connected to the water source and the bottom of the membrane tank, the water inlet branch pipe connected to the water inlet pipe 1 and the surface cleaning mechanism 3, the water inlet regulating valve set on the water inlet pipe 1, and the water inlet regulating valve. It is located between the water inlet branch pipe and the membrane pool.

The sewage pipe 13 is connected with the lower part of the main body 4 of the membrane tank, and the sewage pipe 13 is provided with a first sewage valve 18 . The sewage tank 9 is connected to the sewage pipe 13 , and a second sewage valve 12 is arranged at the connection between the sewage tank 9 and the sewage pipe 13 . The level of the sewage tank 9 is higher than the level of the outlet pipe 10 . Sewage discharge tank 9 can adopt forms such as triangular weir, rectangular weir.

The surface sweeping mechanism 3 is a perforated pipe, a distributed flushing mechanism or a channel arranged on the membrane pool. The height difference between the surface sweeping mechanism 3 and the sewage tank 9 is not more than 0.5m.

The air flushing mechanism includes an air flushing pipe 14 connected to the bottom water distribution tank 5, an aeration valve 16, an aeration fan 17, and an air release valve 15. The aeration valve 16 is connected to the air flushing pipe 14 and the aeration fan 17 respectively, and the air The valve 15 is connected with the blast pipe 14 . The aeration extension can be replaced by an air compressor, an air pump, etc. with the same function.

One end of the cross-flow flushing pump 20 is connected with the water distribution tank 5 at the bottom. The other end of the cross-flow flushing pump 20 is connected with the produced water tank/water inlet pipe 1 . The water source during cross-flow flushing can be the filtered water of the produced water tank or the water to be filtered to save costs.

The water production system includes a water production tank, a water production valve respectively connected to the water production tank and the water outlet pipe 10, and a suction pump for sucking the water filtered by the membrane module 8 into the production water tank. Wherein, the produced water tank, the produced water valve and the suction pump are not shown in the figure.

work process

The working process of this embodiment is illustrated with reference to Figures 1 to 3, mainly including the membrane filtration process and the membrane cleaning process, as follows.

Membrane filtration process: During filtration, the water inlet regulating valve 2 is fully opened, and the filtered water enters the water distribution tank 5 at the bottom of the membrane pool through the water inlet pipe 1, and then evenly distributes water to the membrane module 8 through the long handle filter head 6. The water to be filtered flows upward through the protective membrane shell 19 of the membrane module 8, and flows out of the membrane module 8 through the water and air holes 21 located in the middle and upper part. Driven by the inflow of water, a circulation is formed inside and outside the protective membrane shell 19 to enhance the erosion of the membrane surface. When the liquid level of the main body 4 of the membrane tank submerges the membrane module 8, start the suction pump connected to the water outlet pipe 10 on the produced water tank, and the treated water enters the produced water tank through the water outlet pipe 10.

Membrane cleaning process: After the membrane has been filtered for a period of time, the accumulation of surface pollutants will reduce the water production capacity of the membrane, and when the water production resistance increases to a certain extent, the membrane needs to be cleaned to restore the water production capacity. In this embodiment, membrane cleaning includes three methods: water backwash, gas backwash and cross-flow flushing, and the three methods can be combined.

When performing membrane cleaning, close the production water valve, gradually turn down the water inlet regulating valve 2, so that the water to be filtered enters the surface sweeping mechanism 3, and the degree of opening and closing of the water inlet regulating valve 2 depends on the actual water head loss of the water inlet branch pipe and the water inlet pipe 1 and Depends on the intensity of cleaning required for the surface.

The specific backwashing process is as follows:

1. Water backwashing process: Start the backwashing pump 11, and the filtered water of the produced water tank is pressurized into the inside of the membrane filament of the membrane module 8 through the backwashing pump 11, and backwashed from the inside to the outside; the backwashing water is discharged from the upper part of the membrane pool The tank 9 is drained, and at the same time, the surface sweeping system installed on the upper part of the membrane pool sweeps the backwash water sideways to push all the backwashed pollutants to the sewage tank 9 and discharge them.

2. Gas backwashing process: start the aeration fan 17, open the aeration valve 16, the gas enters the bottom water distribution tank 5 through the air flushing pipe 14, and enters the membrane module 8 through the air inlet of the long handle filter head 6, and the membrane module The membrane filaments in 8 carry out disturbance flushing. After the air washing finishes, close the aeration valve 16 and the aeration fan 17, and open the air release valve 15 to empty the air in the water distribution tank 5 at the bottom.

3. Cross-flow flushing process: start the cross-flow flushing pump 20, and the cross-flow flushing pump 20 directly sucks the water to be filtered in the water inlet pipe 1 into the bottom water distribution tank 5, and performs cross-flow flushing on the membrane module 8. Surface sweeping works the same in this flushing process as in the water backwashing process.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. one kind is dispersed into water submerged membrane cell system it is characterised in that including membrane cisterna, water inlet system, being arranged on inside membrane cisterna Membrane module（8）, respectively with membrane module（8）The outlet pipe connecting with water production system（10）, and outlet pipe（10）The backwash connecting Pump（11）, the blow-off pipe that is connected with membrane cisterna（13）, be arranged on the dirt discharge groove on membrane cisterna top（9）, be arranged on membrane cisterna top and with institute State dirt discharge groove（9）Relative surface sweep washing mechanism 3（3）；Described dirt discharge groove（9）With described blow-off pipe（13）Connect；

Described water inlet system includes the water inlet pipe being connected respectively with water source and membrane cisterna bottom（1）, respectively with water inlet pipe（1）And surface Sweep washing machine structure（3）Connect water inlet pipe, be arranged on water inlet pipe（1）On inlet regulating valve（2）, described inlet regulating valve（2） Positioned between described water inlet pipe and membrane cisterna.

2. according to claim 1 it is dispersed into water submerged membrane cell system it is characterised in that described dirt discharge groove（9）Water Flat height is higher than described outlet pipe（10）Level height.

3. according to claim 1 it is dispersed into water submerged membrane cell system it is characterised in that being provided with filter plate in described membrane cisterna （7）, described filter plate（7）Membrane cisterna is divided into the membrane cisterna main body being sequentially connected up and down（4）With bottom cloth tank（5）；Described water inlet pipe （1）With described bottom cloth tank（5）Connect；

Described filter plate（7）It is provided with and described bottom cloth tank（5）The filter of connection（6）, described membrane module（8）One end and institute State filter（6）Relatively, described membrane module（8）The other end and described outlet pipe（10）Connect；Described blow-off pipe（13）With described Membrane cisterna main body（4）Connect.

4. according to claim 3 it is dispersed into water submerged membrane cell system it is characterised in that also including for membrane module （8）Carry out the gas flushing mechanism of backwash.

5. according to claim 4 it is dispersed into water submerged membrane cell system it is characterised in that described gas flushing mechanism includes With bottom cloth tank（5）The gas washing pipe connecting（14）, aeration valve（16）, Aeration fan（17）, vent valve（15）, described aeration valve （16）Respectively with described gas washing pipe（14）And Aeration fan（17）Connect, described vent valve（15）With described gas washing pipe（14）Even Connect.

6. according to claim 3 it is dispersed into water submerged membrane cell system it is characterised in that also including for membrane module （8）Carry out the cross-flow flushing pump of cross-flow flushing（20）, described cross-flow flushing pump（20）With described bottom cloth tank（5）Connect.

7. according to claim 3 it is dispersed into water submerged membrane cell system it is characterised in that described cross-flow flushing pump（20） One end and described bottom cloth tank（5）Connect, described cross-flow flushing pump（20）The other end with described product water tank/water inlet pipe （1）Connect.

8. according to claim 1 it is dispersed into water submerged membrane cell system it is characterised in that described membrane module（8）Peripheral hardware There is protection putamina（19）, described protection putamina（19）Middle part and/or top be provided with water air passing hole（21）.

9. according to claim 1 it is dispersed into water submerged membrane cell system it is characterised in that described surface sweep washing mechanism （3）For perforated pipe, distributed flushing machine or be arranged on the duct on membrane cisterna.

10. according to claim 1 it is dispersed into water submerged membrane cell system it is characterised in that described filter（6）For long handle Filter.