CN221846719U - A pressure ultrafiltration membrane system - Google Patents

Abstract

The utility model provides a pressure type ultrafiltration membrane system, comprising: the system comprises a water production tank, a pressure type ultrafiltration membrane component, a pipeline filter and a concentrated water tank; the air inlet communicated with the one-way air inlet valve is arranged at the bottom end of the pressure type ultrafiltration membrane component, the inside of the pressure type ultrafiltration membrane component is emptied by controlling the opening degree of the air inlet valve, the air scrubbing process of the pressure type ultrafiltration membrane component is realized by the natural air suction mode at the bottom, and the traditional air scrubbing process realized by adopting the air compressor energy supply is changed; that is, the gas scrubbing process of the pressure type ultrafiltration membrane system provided by the utility model does not need compressed air to carry out the gas scrubbing process, thereby realizing energy-consumption-free gas scrubbing and reducing the energy consumption of the pressure type ultrafiltration membrane system.

Description

A pressure type ultrafiltration membrane system

Technical Field

The utility model belongs to the technical field of filter membranes, and more specifically, particularly relates to a pressure-type ultrafiltration membrane system.

Background Art

Membrane separation technology is centered on separation membrane materials. It uses selectively permeable membrane materials through pressure or electric driving force to selectively separate substances in liquids or gases, thereby achieving the effects of separation, concentration and purification of materials. The operation process of this membrane separation technology has no phase change (no phase change before and after the reaction), low energy consumption, and uses molecular-level filtration. According to the pore size of different separation membrane materials or the apparent size of retained particles, it can be divided into four membrane separation processes: microfiltration (micron or submicron level), ultrafiltration (10 nanometers), nanofiltration (nanoscale), and reverse osmosis (subnanometer level).

The ultrafiltration membrane separation process mainly removes particles of 10-100nm in size, including organic macromolecules, colloids, proteins, etc. The ultrafiltration membrane can be classified into submerged ultrafiltration and pressure ultrafiltration according to the operation mode. During the operation of the pressure ultrafiltration membrane, substances such as colloids and particles intercepted by the ultrafiltration membrane will form an adsorption layer on the membrane surface, causing a certain degree of fouling on the membrane pores, that is, membrane fouling. The formation of membrane fouling causes a significant decrease in membrane water flux. In severe cases, the ultrafiltration process is difficult to carry out, hindering the normal operation of the ultrafiltration system. At present, pressure ultrafiltration membranes usually use air scrubbing and other methods to alleviate and restore membrane fouling.

However, air scrubbing requires compressed air from an air compressor, and the configuration of an air compressor increases the energy consumption of system operation.

Utility Model Content

In view of this, the purpose of the utility model is to provide a pressure type ultrafiltration membrane system for realizing energy-free gas scrubbing and reducing the energy consumption of the pressure type ultrafiltration membrane system.

The application discloses a pressure type ultrafiltration membrane system, comprising: a water production tank, a pressure type ultrafiltration membrane assembly, a pipeline filter and a concentrated water tank;

The top end of the pressure type ultrafiltration membrane assembly is provided with an upper end cover, and the bottom end is provided with a lower end cover;

The water production inlet of the water production tank is connected to the water production port of the upper end cover;

The water outlet of the water production tank is connected to the concentrated water outlet of the upper end cover and the water outlet of the upper end cover respectively through the pipeline filter;

The water inlet of the lower end cover is connected to the concentrated water tank;

An air inlet is arranged at the bottom end of the lower end cover, and an aeration head is arranged on the air inlet; the air inlet is connected to an air inlet valve; and the air inlet valve is a one-way valve.

Optionally, a water production valve is provided on the pipeline between the water production inlet of the water production box and the water production outlet of the upper end cover.

Optionally, a first cleaning valve is provided on the pipeline between the pipeline filter and the water outlet of the water production tank;

A second cleaning valve and a positive flushing valve are provided on the pipeline between the pipeline filter and the water outlet of the upper end cover;

A second cleaning valve and a backwashing valve are arranged on the pipeline between the pipeline filter and the concentrated water outlet of the pressure ultrafiltration membrane assembly.

Optionally, the concentrate water port of the upper end cover is also connected to the concentrate water tank;

A concentrate water discharge valve is arranged on the pipeline between the concentrate water inlet and the concentrate water tank.

Optionally, a concentrated water cleaning pipeline is provided between the concentrated water tank and the water inlet of the lower end cover; a concentrated water cleaning valve is provided on the concentrated water cleaning pipeline;

The water inlet of the lower end cover is also connected to a water inlet pipe; a water inlet valve is arranged on the water inlet pipe.

Optionally, the upper end cover is provided with a water baffle;

A positive flushing water inlet pipe is provided on the water baffle plate;

The upper end of the positive flushing water inlet pipe is evenly distributed on the water retaining plate, and the lower end of the positive flushing water inlet pipe penetrates the upper rubber layer;

The membrane filaments are evenly distributed on the surface of the upper glue layer; and the upper ends of the membrane filaments penetrate the upper glue layer.

Optionally, a lower rubber layer is provided at the top end of the lower end cover;

A cleaning concentrated water pipe is provided on the lower rubber layer;

The cleaning concentrated water pipe penetrates the lower rubber layer;

The membrane threads are evenly distributed on the surface of the lower glue layer, and the lower ends of the membrane threads are immersed and fixed in the lower glue layer.

Optionally, the number of the positive flushing water inlet pipes of the upper end cover is the same as the number of the cleaning concentrated water pipes of the lower end cover.

Optionally, the installation height of the water production tank is higher than the pressure ultrafiltration membrane assembly, and the height difference between the bottom of the water production tank and the top of the pressure ultrafiltration membrane assembly is 2-4m; and/or,

The installation height of the concentrated water tank is lower than that of the pressure-type ultrafiltration membrane assembly, and the height difference between the bottom of the concentrated water tank and the top of the pressure-type ultrafiltration membrane assembly is 0-2m.

Optionally, a sewage valve is provided at the sewage outlet of the water production tank;

The water production tank is provided with a liquid level meter;

The overflow of the water production tank is drained through a pipeline;

A water valve is arranged on the pipeline between the water outlet of the water production box and the water use point.

It can be seen from the above technical scheme that a pressure ultrafiltration membrane system provided by the utility model includes: a water production tank, a pressure ultrafiltration membrane assembly, a pipeline filter and a concentrated water tank; the water production tank, the pressure ultrafiltration membrane assembly, the pipeline filter and the concentrated water tank are connected, and an air inlet connected to a one-way air inlet valve is arranged at the bottom end of the pressure ultrafiltration membrane assembly, and the interior of the pressure ultrafiltration membrane assembly is emptied by controlling the opening of the air inlet valve, and the air scrubbing process of the pressure ultrafiltration membrane assembly is realized through natural suction at the bottom, thereby changing the traditional air scrubbing process achieved by using an air compressor for power supply; that is, the air scrubbing process of the pressure ultrafiltration membrane system provided by the present application does not require compressed air for the air scrubbing process, thereby achieving energy-free air scrubbing and reducing the energy consumption of the pressure ultrafiltration membrane system.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a pressure ultrafiltration membrane system provided by an embodiment of the utility model;

FIG2 is a schematic diagram of a pressure type ultrafiltration membrane assembly involved in a pressure type ultrafiltration membrane system provided by an embodiment of the present utility model;

3 is a schematic diagram of an upper end cover involved in a pressure-type ultrafiltration membrane system provided by an embodiment of the utility model;

FIG4 is another schematic diagram of an upper end cover involved in a pressure-type ultrafiltration membrane system provided by an embodiment of the utility model;

5 is a schematic diagram of a lower end cover involved in a pressure-type ultrafiltration membrane system provided by an embodiment of the utility model;

FIG. 6 is another schematic diagram of a lower end cover involved in a pressure-type ultrafiltration membrane system provided in an embodiment of the present utility model.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

In the present application, the term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprising one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. In addition, the terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

The embodiment of the present application provides a pressure-type ultrafiltration membrane system, which is used to solve the problem in the prior art that air scrubbing needs to be implemented by using compressed air from an air compressor, but the configuration of an air compressor increases the energy consumption of the system operation.

Membrane separation technology is a technology that uses special membranes to selectively separate finished products in liquids or gases. It can separate, concentrate and purify wastewater and materials. Currently, membrane separation technology has been widely used in water treatment, petrochemicals, municipal drinking water and seawater desalination.

Ultrafiltration membranes can be divided into submerged ultrafiltration and pressure ultrafiltration.

Submerged ultrafiltration is a process in which the ultrafiltration membrane assembly is directly immersed in the water to be treated, and the water is forced to pass through the membrane pores through pressure difference or suction, thereby achieving solid-liquid separation.

Pressure ultrafiltration is a process in which a large number of hollow fiber ultrafiltration membranes are placed in a circular cylindrical pressure vessel. The open end of the fiber bundle is cast into a glue layer with epoxy resin and equipped with corresponding connectors (including the water inlet end, water production end, and concentrated water end) to form a pressure ultrafiltration membrane assembly. When the pressure ultrafiltration membrane system is in operation, the water is pressed into the ultrafiltration membrane assembly through the water inlet pump. The pressure ultrafiltration membrane adopts a closed system design.

The present application mainly improves the pressure ultrafiltration membrane system. An air inlet and an air inlet valve are provided at the bottom of the pressure ultrafiltration membrane assembly. The interior of the pressure ultrafiltration membrane assembly is emptied through the air inlet valve, and the air scrubbing process of the assembly is realized through natural air suction at the bottom, thereby changing the traditional method of using an air compressor to supply energy to realize the air scrubbing process.

1 and 2 , the pressure ultrafiltration membrane system includes: a production water tank 1 , a pressure ultrafiltration membrane assembly 2 , a pipeline filter 4 and a concentrated water tank 5 .

An upper end cover 21 is disposed at the top of the pressure ultrafiltration membrane assembly 2, and a lower end cover 22 is disposed at the bottom thereof.

Specifically, water in the pressure-type ultrafiltration membrane assembly 2 flows in or out through the upper end cover 21 and the lower end cover 22; more specifically, water in the pressure-type ultrafiltration membrane assembly 2 flows in through the upper end cover 21 and can also flow in through the lower end cover 22; water in the pressure-type ultrafiltration membrane assembly 2 flows out through the upper end cover 21 and can also flow out through the lower end cover 22.

The pressure type ultrafiltration membrane assembly 2 is mainly used for filtering liquid; it should be noted that the liquid may be a liquid containing impurities such as suspended particles and colloids.

The water production inlet 11 of the water production tank 1 is communicated with the water production port 211 of the upper end cover 21 .

The water outlet 13 of the water production tank 1 is connected to the concentrated water outlet 214 of the upper end cover 21 and the water production outlet 211 of the upper end cover 21 through the pipeline filter 4 respectively.

The water inlet 225 of the lower end cover 22 is communicated with the concentrated water tank 5 .

A valve may also be provided at the bottom of the concentrated water tank 5 to discharge the concentrated water.

An air inlet 224 is provided at the bottom end of the lower end cover 22, and an aeration head 223 is provided on the air inlet 224; the air inlet 224 is communicated with an air inlet valve 331; the air inlet valve 331 is a one-way valve.

The aeration head 223 is disposed inside the lower end cover 22 , and the aeration head 223 is connected to the air inlet 224 via an air pipe.

It should be noted that each device is connected through its own corresponding pipeline.

Specifically, the water production inlet 11 of the water production tank 1 is connected to the first end of the water production pipe, and the second end of the water production pipe is connected to the water production port 211 of the upper end cover 21; that is, the water production inlet 11 of the water production tank 1 is connected to the water production port 211 of the upper end cover 21 through a pipeline, and the pipeline is named a water production pipeline.

The water outlet 13 of the water production tank 1 is connected to the first end of the pre-filtration pipe, and the second end of the pre-filtration pipe is connected to the inlet of the pipe filter 4; that is, the water outlet 13 of the water production tank 1 is connected to the inlet of the pipe filter 4 through a pipe, and the pipe is named the pre-filtration pipe.

The outlet of the pipe filter 4 is connected to the first end of the filtered pipe; the second section of the filtered pipe is respectively connected to the first end of the positive flushing pipe and the first end of the backwashing pipe. The second end of the positive flushing pipe is connected to the water production port 211 of the upper end cover 21; that is, the positive flushing pipe can be connected to the water production port 211 of the upper end cover 21 after merging with the water production pipe. The second end of the backwashing pipe is connected to the concentrated water port 214 of the upper end cover 21.

That is, the outlet of the pipeline filter 4 is connected to the concentrated water outlet 214 of the upper end cover 21 through a pipeline, and the pipeline can be divided into two pipelines, namely, a post-filtration pipeline and a backwashing pipeline. The outlet of the pipeline filter 4 is connected to the water production outlet 211 of the upper end cover 21 through a pipeline, and the pipeline can be divided into two pipelines, namely, a post-filtration pipeline and a positive flushing pipeline.

By controlling the internal liquid of the pressure ultrafiltration membrane assembly 2 to be emptied and controlling the opening and closing of the air inlet valve 331, air is automatically sucked into the pressure ultrafiltration membrane assembly 2 and evenly distributed into the liquid through aeration 233, thereby realizing an energy-free air scrubbing process for the outer surface of the membrane filament 23 from bottom to top.

In this embodiment, the production water tank 1, the pressure ultrafiltration membrane assembly 2, the pipeline filter 4 and the concentrated water tank 5 are connected, and an air inlet 224 connected to the one-way air inlet valve 331 is provided at the bottom end of the pressure ultrafiltration membrane assembly 2. By controlling the opening of the air inlet valve 331, the interior of the pressure ultrafiltration membrane assembly 2 is emptied, and the air scrubbing process of the pressure ultrafiltration membrane assembly is realized through natural suction at the bottom, thereby changing the traditional method of using an air compressor to supply energy to realize the air scrubbing process; that is, the air scrubbing process of the pressure ultrafiltration membrane system provided by the present application does not require compressed air for the air scrubbing process, thereby realizing energy-free air scrubbing and reducing the energy consumption of the pressure ultrafiltration membrane system.

Optionally, a water production valve 312 is provided on the pipeline between the water production inlet 11 of the water production tank 1 and 211 of the upper end cover 21 .

It can be seen from the above description that the pipeline between the water production inlet 11 of the water production box 1 and the water production port 211 of the upper end cover 21 is the water production pipeline; a water production valve 312 is arranged on the water production pipeline, and the water flux in the water production pipeline can be controlled by controlling the opening of the water production valve 312. When the water production valve 312 is completely closed, water flow is prohibited on the water production pipeline. When the water production valve 312 is opened, the water flow in the water production pipeline is adjusted according to the opening size of the water production valve 312.

Optionally, a first cleaning valve 313 is provided on the pipeline between the pipeline filter 4 and the produced water outlet 13 of the produced water tank 1 .

It can be seen from the above description that the pipeline between the inlet of the pipeline filter 4 and the water outlet 13 of the water production tank 1 is the pre-filtration pipeline; a first cleaning valve 313 is provided on the pre-filtration pipeline; and further, the water flux in the pre-filtration pipeline can be controlled by controlling the opening of the first cleaning valve 313. When the first cleaning valve 313 is completely closed, water flow is prohibited in the pre-filtration pipeline. When the first cleaning valve 313 is opened, the water flow in the pre-filtration pipeline is adjusted according to the opening size of the first cleaning valve 313.

A second cleaning valve 314 and a positive flushing valve 315 are provided on the pipeline between the pipeline filter 4 and the water outlet 211 of the upper end cover 21 .

It can be seen from the above description that the pipeline between the outlet of the pipeline filter 4 and the water outlet 211 of the upper end cover 21 is a post-filtration pipeline and a positive flushing pipeline respectively.

A second cleaning valve 314 is provided on the filtered pipe; the opening of the second cleaning valve 314 can be controlled to control the water flux in the filtered pipe. When the second cleaning valve 314 is completely closed, water flow is prohibited in the filtered pipe. When the second cleaning valve 314 is opened, the water flow in the filtered pipe is adjusted according to the opening of the second cleaning valve 314.

A positive flushing valve 315 is provided on the positive flushing pipe; the water flux in the positive flushing pipe can be controlled by controlling the opening of the positive flushing valve 315. When the positive flushing valve 315 is completely closed, water flow is prohibited in the positive flushing pipe. When the positive flushing valve 315 is opened, the water flow in the positive flushing pipe is adjusted according to the opening size of the positive flushing valve 315.

A second cleaning valve 314 and a backwashing valve 316 are provided on the pipeline between the pipeline filter 4 and the concentrated water outlet 214 of the pressure ultrafiltration membrane assembly 2 .

It can be seen from the above description that the pipeline between the outlet of the pipeline filter 4 and the concentrated water outlet 214 of the pressure ultrafiltration membrane assembly 2 is a post-filtration pipeline and a backwashing pipeline respectively.

A second cleaning valve 314 is provided on the filtered pipe; the opening of the second cleaning valve 314 can be controlled to control the water flux in the filtered pipe. When the second cleaning valve 314 is completely closed, water flow is prohibited in the filtered pipe. When the second cleaning valve 314 is opened, the water flow in the filtered pipe is adjusted according to the opening of the second cleaning valve 314.

A backwash valve 316 is provided on the backwash pipe; the water flux in the backwash pipe can be controlled by controlling the opening of the backwash valve 316. When the backwash valve 316 is completely closed, water flow is prohibited in the backwash pipe. When the backwash valve 316 is opened, the water flow in the backwash pipe is adjusted according to the opening of the backwash valve 316.

It should be noted that the number of post-filtration pipes can be one or more. When the number is one, the forward flushing pipe and the backwashing pipe converge into the post-filtration pipe; when the number of post-filtration pipes is two, the forward flushing pipe is connected to one post-filtration pipe, and the backwashing pipe is connected to another post-filtration pipe. After the two post-filtration pipes converge, they are connected to the outlet of the pipe filter 4; of course, there may be other situations, which will not be elaborated here one by one, depending on the actual situation, and are all within the protection scope of this application.

Optionally, the concentrate outlet 214 of the upper end cover 21 is also connected to the concentrate tank 5 .

A concentrate discharge valve 317 is provided on the pipeline between the concentrate inlet 214 and the concentrate tank 5 .

That is to say, the concentrate outlet 214 of the upper end cover 21 is communicated with the concentrate tank 5 and the pipeline filter 4 respectively.

The concentrate water port 214 of the upper end cover 21 is connected to the concentrate water tank 5 through a pipe, and the pipe is named as the concentrate water discharge pipe. Specifically, the first end of the concentrate water discharge pipe is connected to the concentrate water port 214 of the upper end cover 21, and the second end of the concentrate water discharge pipe is connected to the concentrate water tank 5.

A concentrate discharge valve 317 is provided in the concentrate discharge pipeline, and the water flux in the concentrate discharge pipeline can be controlled by controlling the opening of the concentrate discharge valve 317. When the concentrate discharge valve 317 is completely closed, water flow is prohibited in the concentrate discharge pipeline. When the concentrate discharge valve 317 is opened, the water flow in the concentrate discharge pipeline is adjusted according to the opening of the concentrate discharge valve 317.

Optionally, a concentrated water cleaning pipeline is provided between the concentrated water tank 5 and the water inlet 225 of the lower end cover 22; and a concentrated water cleaning valve 318 is provided on the concentrated water cleaning pipeline.

The water inlet 225 of the lower end cover 22 is also connected to a water inlet pipe; a water inlet valve 319 is provided on the water inlet pipe.

Specifically, the first end of the cleaning concentrated water pipeline is communicated with the water inlet 225 of the lower end cover 22 , and the second end of the cleaning concentrated water pipeline is communicated with the concentrated water tank 5 .

A cleaning concentrated water valve 318 is provided in the cleaning concentrated water pipeline, and the water flux in the cleaning concentrated water pipeline can be controlled by controlling the opening of the cleaning concentrated water valve 318. When the cleaning concentrated water valve 318 is completely closed, water flow is prohibited in the cleaning concentrated water pipeline. When the cleaning concentrated water valve 318 is opened, the water flow in the cleaning concentrated water pipeline is adjusted according to the opening size of the cleaning concentrated water valve 318.

Optionally, as shown in FIG. 3 and FIG. 4 , the upper end cover 21 is provided with a water baffle 213 .

A positive flushing water inlet pipe 212 is provided on the water baffle plate 213 .

The setting of the water baffle 213 can make the water received by the upper end cover 21 be evenly distributed to the positive flushing water inlet pipe 212 after being buffered by the water baffle 213, avoiding the problem that only part of the positive flushing water inlet pipe 212 has uneven water flow, which reduces the positive flushing effect.

The upper end of the positive flushing water inlet pipe 212 is evenly distributed on the water baffle 213 , and the lower end of the positive flushing water inlet pipe 212 penetrates the upper rubber layer 215 .

That is to say, the water baffle 213 and the upper glue layer 215 can be circulated through the positive flushing water inlet pipe 212 .

The membrane threads 23 are evenly distributed on the surface of the upper glue layer 215 . The upper ends of the membrane threads 23 penetrate the upper glue layer 215 .

The membrane fibers 23 are mainly used for filtering.

Optionally, as shown in FIG. 5 and FIG. 6 , a lower glue layer 221 is provided on the top of the lower end cover 22 .

A cleaning concentrated water pipe 222 is provided on the lower rubber layer 221 .

The cleaning concentrated water pipe 222 penetrates the lower rubber layer 221 .

The membrane threads 23 are evenly distributed on the surface of the lower glue layer 221 , and the lower ends of the membrane threads 23 are immersed and fixed in the lower glue layer 221 .

The membrane filaments 23 are hollow fiber membranes, including internal pressure type and external pressure type; the membrane filaments 23 are fixed on the surface of the lower rubber layer 221 .

The water flowing in through the water outlet 211 of the upper end cover 21 enters the cavity between the water retaining plate 213 and the upper rubber layer 215 ; is filtered by the membrane filaments 23 , enters the cavity between the upper rubber layer 215 and the lower rubber layer 221 , and then flows out through the cleaning concentrated water pipe of the lower rubber layer 221 to the water inlet 225 of the lower end cover 22 .

The water flowing in through the concentrated water inlet 214 of the upper end cover 21 enters the positive flushing water inlet pipe 212 ; then flows out through the cleaning concentrated water pipe 222 of the lower rubber layer 221 to the water inlet 225 of the lower end cover 22 .

Optionally, the number of the positive flushing water inlet pipes 212 of the upper end cover 21 and the number of the cleaning concentrated water pipes 222 of the lower end cover 22 are the same.

Specifically, the number of the positive flushing water inlet pipe 212 and the cleaning concentrated water pipe 222 can be 6-36; of course, it can also be other values, which will not be repeated here one by one, and it can be determined according to the actual situation, all of which are within the protection scope of this application.

Optionally, the installation height of the water production tank 1 is higher than that of the pressure ultrafiltration membrane assembly 2, and the height difference between the bottom of the water production tank 1 and the top of the pressure ultrafiltration membrane assembly 2 is 2-4m.

And/or, the installation height of the concentrate tank 5 is lower than that of the pressure ultrafiltration membrane assembly 2, and the height difference between the bottom of the concentrate tank 5 and the top of the pressure ultrafiltration membrane assembly 2 is 0-2m.

That is to say, the installation height of the water production tank 1 is higher than the pressure ultrafiltration membrane assembly 2, so that there is a height difference between the water production tank 1 and the pressure ultrafiltration membrane assembly 2, and the high-position water production tank 1 is used to provide the gravitational potential energy of the positive flushing water for the pressure ultrafiltration membrane assembly 2. In addition, positive flushing water pipes 212 are evenly distributed in the upper end cover 21, and the opening and closing of corresponding valves are controlled by a controller to realize an energy-free hydraulic cleaning process of the outer surface of the membrane from top to bottom; the positive flushing process does not require a pump to provide positive flushing water pressure, thereby reducing the positive flushing energy consumption of the pressure ultrafiltration membrane system.

At the same time, the high-level water tank can be used to provide the gravity potential energy of the backwash water, and the corresponding valves can be controlled by the controller to open and close, so that the backwash water can penetrate from the inside of the membrane fiber through the membrane layer to the outside, realizing an energy-free hydraulic cleaning process inside the membrane layer.

It should be noted that the existing hydraulic cleaning technology requires the use of a centrifugal pump to supply energy to achieve high-flow rate forward flushing and reverse back flushing of the membrane surface; in order to enable the pressure membrane system to operate continuously and stably, the hydraulic cleaning and air scrubbing processes need to be cyclically carried out during operation, which further increases the operating energy consumption of the pressure ultrafiltration membrane system.

In this embodiment, height difference is used to achieve hydraulic cleaning, such as forward flushing and back flushing, which changes the traditional method of using a high-pressure water pump to supply energy to achieve the hydraulic cleaning process; at the same time, an air valve is used to achieve the air scrubbing process of the components through natural suction at the bottom; these two cleaning methods are both achieved under energy-free conditions. In addition, the water production process and cleaning process of the pressure ultrafiltration membrane system can be cyclically carried out, and the cleaning process is energy-free, thereby reducing the operating energy consumption of the pressure membrane system.

Optionally, a sewage valve 320 is provided at the sewage outlet 14 of the water production tank 1 .

Specifically, the sewage in the water production tank 1 can be discharged through the sewage outlet 14 .

The sewage outlet 14 of the water production tank 1 is connected to the first end of the first pipe, and the second end of the first pipe is used to discharge sewage. The sewage valve 320 is arranged on the first pipe, and the water flux in the first pipe can be controlled by the opening of the sewage valve 320. When the sewage valve 320 is completely closed, the water flow in the first pipe is prohibited. When the sewage valve 320 is opened, the water flow in the first pipe is adjusted according to the opening of the sewage valve 320.

The produced water tank 1 is provided with a liquid level meter 15 .

The liquid level meter 15 is used to measure the water level in the water production tank 1. The liquid level meter 15 may be provided with a display to display the water level of the water production tank 1 in real time.

The overflow port 12 of the water production tank 1 is drained through a pipeline.

The overflow port 12 is disposed above the water production tank 1 , so that when the water level in the water production tank 1 reaches a preset height, the water can be discharged through the overflow port 12 , thereby preventing excessive water from accumulating in the water production tank 1 .

A water valve 311 is provided on the pipeline between the water outlet 13 of the water production tank 1 and the water use point.

That is, the water outlet 13 of the water production tank 1 is connected to the first end of the second pipe, and the second end of the second pipe is connected to the water point. The water valve 311 is arranged on the second pipe, and the water flux in the second pipe can be controlled by the opening of the water valve 311. When the water valve 311 is completely closed, the water flow in the second pipe is prohibited. When the water valve 311 is opened, the water flow in the second pipe is adjusted according to the opening of the water valve 311.

The working principle and use process of the pressure ultrafiltration membrane system are explained below:

Water production process: The PCL controller controls to close all valves in the pressure ultrafiltration membrane system, and opens the water inlet valve 319, the water production valve 312, and the concentrated water discharge valve 317 in sequence to complete the water production process of the system.

Air scrubbing process: The PCL (programmable logic) controller controls to close all valves in the pressure ultrafiltration membrane system, opens the cleaning concentrate valve 318 and the air inlet valve 331 in sequence, completes the emptying of the liquid inside the pressure ultrafiltration membrane assembly 2, and uses the air inlet valve 331 to allow the gas to enter from the bottom of the pressure ultrafiltration membrane assembly 2 and be evenly distributed in the liquid through the aeration head 223 and rise to the top of the pressure ultrafiltration membrane assembly 2, thereby realizing the air scrubbing process of the outer surface of the membrane wire inside the pressure ultrafiltration membrane assembly 2.

Positive flushing process: The PCL controller controls to close all valves in the pressure ultrafiltration membrane system, and opens the first cleaning valve 313, the second cleaning valve 314, the positive flushing valve 315, and the cleaning concentrated water valve 318 in sequence, so that the cleaning water enters the pressure ultrafiltration membrane assembly 2 from the water production tank 1 through the pipeline filter 4 and the concentrated water port 214. After being evenly distributed through the positive flushing water inlet pipe 212, the outer surface of the membrane is hydraulically cleaned from top to bottom.

Backwashing process: The PCL controller controls to close all valves in the pressure ultrafiltration membrane system, and opens the first cleaning valve 313, the second cleaning valve 314, the backwashing valve 316, and the cleaning concentrated water valve 318 in sequence, so that the cleaning water enters the pressure ultrafiltration membrane assembly 2 from the water production tank 1 through the pipeline filter 4 and the water production port 211. The cleaning water is evenly distributed in the hollow inner cavity of each membrane filament 23, and penetrates from the inside of the membrane filament 23 through the membrane layer to the outside to achieve hydraulic cleaning of the inside of the membrane layer.

In this embodiment, the system operation and cleaning process includes a water production process, an air scrubbing process, a forward flushing process and a backwashing process. By pre-setting the water production process of the pressure ultrafiltration membrane system and the time of each process in the cleaning stage on the PLC controller, stable water production of the system can be achieved and system membrane pollution can be reduced.

The features recorded in the various embodiments in this specification can be replaced or combined with each other, and the same and similar parts between the various embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A pressure type ultrafiltration membrane system, comprising: the device comprises a water production tank (1), a pressure type ultrafiltration membrane component (2), a pipeline filter (4) and a concentrate tank (5);

An upper end cover (21) is arranged at the top end of the pressure type ultrafiltration membrane component (2), and a lower end cover (22) is arranged at the bottom end of the pressure type ultrafiltration membrane component;

The water producing inlet (11) of the water producing tank (1) is communicated with the water producing port (211) of the upper end cover (21);

the water outlet (13) of the water production tank (1) is respectively communicated with the water concentration port (214) of the upper end cover (21) and the water production port (211) of the upper end cover (21) through the pipeline filter (4);

A water inlet (225) of the lower end cover (22) is communicated with the concentrate tank (5);

an air inlet (224) is formed in the bottom end of the lower end cover (22), and an aeration head (223) is arranged on the air inlet (224); the air inlet (224) is communicated with an air inlet valve (331); the air inlet valve (331) is a one-way valve.

2. The pressure type ultrafiltration membrane system as claimed in claim 1, wherein a water producing valve (312) is arranged on a pipeline between the water producing inlet (11) of the water producing tank (1) and the water producing port (211) of the upper end cover (21).

3. The pressure type ultrafiltration membrane system according to claim 1, wherein a first cleaning valve (313) is provided on a pipe between the pipe filter (4) and a water outlet (13) of the water production tank (1);

A second cleaning valve (314) and a positive cleaning valve (315) are arranged on a pipeline between the pipeline filter (4) and the water producing port (211) of the upper end cover (21);

A second cleaning valve (314) and a back flushing valve (316) are arranged on a pipeline between the pipeline filter (4) and the concentrated water port (214) of the pressure type ultrafiltration membrane component (2).

4. The pressure type ultrafiltration membrane system according to claim 1, wherein the concentrate outlet (214) of the upper end cap (21) is also in communication with the concentrate tank (5);

A concentrated water discharge valve (317) is arranged on a pipeline between the concentrated water port (214) and the concentrated water tank (5).

5. The pressure type ultrafiltration membrane system as claimed in claim 1, wherein a cleaning concentrate line is provided between the concentrate tank (5) and the water inlet (225) of the lower end cap (22); a cleaning concentrate valve (318) is arranged on the cleaning concentrate pipeline;

The water inlet (225) of the lower end cover (22) is also communicated with a water inlet pipeline; and a water inlet valve (319) is arranged on the water inlet pipeline.

6. Pressure type ultrafiltration membrane system according to claim 1, wherein the upper end cap (21) is provided with a water deflector (213);

The water baffle (213) is provided with a positive flushing water inlet pipe (212);

the upper end of the positive flushing water inlet pipe (212) is uniformly and penetratingly distributed on the water baffle (213), and the lower end of the positive flushing water inlet pipe (212) is penetrated through the upper adhesive layer (215);

The surface of the upper adhesive layer (215) is uniformly provided with membrane wires (23); the upper ends of the membrane wires (23) penetrate through the upper adhesive layer (215).

7. The pressure type ultrafiltration membrane system according to claim 1, wherein a lower glue layer (221) is provided at the top end of the lower end cap (22);

a cleaning concentrate pipe (222) is arranged on the lower adhesive layer (221);

The cleaning concentrate pipe (222) penetrates through the lower adhesive layer (221);

The membrane wires (23) are uniformly distributed on the surface of the lower adhesive layer (221), and the lower ends of the membrane wires (23) are immersed and fixed in the lower adhesive layer (221).

8. The pressure type ultrafiltration membrane system according to claim 1, wherein the number of the water inlet pipes (212) being washed of the upper end cover (21) is the same as the number of the water outlet pipes (222) being washed of the lower end cover (22).

9. The pressure type ultrafiltration membrane system according to claim 1, wherein the installation height of the water producing tank (1) is higher than that of the pressure type ultrafiltration membrane component (2), and the height difference between the bottom of the water producing tank (1) and the top of the pressure type ultrafiltration membrane component (2) is 2-4m; and/or the number of the groups of groups,

The installation height of the concentrated water tank (5) is lower than that of the pressure type ultrafiltration membrane component (2), and the height difference between the bottom of the concentrated water tank (5) and the top of the pressure type ultrafiltration membrane component (2) is 0-2m.

10. The pressure type ultrafiltration membrane system according to claim 1, wherein a drain valve (320) is provided at a drain outlet (14) of the water production tank (1);

The water producing tank (1) is provided with a liquid level meter (15);

An overflow port (12) of the water production tank (1) is used for draining water through a pipeline;

a water valve (311) is arranged on a pipeline between a water outlet (13) of the water production tank (1) and a water consumption point.