Purified water pretreatment system

Abstract

The utility model discloses a purified water pretreatment system which comprises a tubular ultrafiltration tank, a raw water inlet pipeline, a concentrated water outlet pipeline, a produced water outlet pipeline, a washing pipeline and a backwashing pipeline, the tubular ultrafiltration tank is filled with a tubular ultrafiltration membrane, one end of the tubular ultrafiltration tank is a raw water inlet, and the other end of the tubular ultrafiltration tank is provided with a concentrated water outlet connector. A water producing port is formed in the side wall of the other end of the tubular ultrafiltration tank and connected with a water producing outlet pipeline, a cleaning water tank inlet pipeline is connected to the water producing outlet pipeline, and the cleaning water tank inlet pipeline is connected to a cleaning water tank; and a conventional washing pipeline is branched from the washing water tank and is connected to a raw water inlet pipeline. Sand filtration and carbon filtration are not needed as front-section pretreatment, and compared with a traditional sand filtration and hollow fiber filtration process, the occupied area can be saved by 50%.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, and in particular relates to a purified water pretreatment system. Background Art

[0002] Purified water equipment is one of the indispensable and important equipment in the production of pharmaceutical, medical, food, chemical and other industries. As an important part of purified water equipment, the pretreatment system plays a vital role in ensuring the stable operation of purified water equipment and producing high-quality purified water.

[0003] The pretreatment system in purified water equipment is usually composed of multi-media filters, activated carbon filters and hollow fiber ultrafiltration membranes. Its main function is to remove impurities, suspended matter, organic matter, heavy metal ions, etc. in the raw water, and provide qualified influent water quality for subsequent purification treatment.

[0004] Multi-media filters utilize filter media of varying particle sizes to physically intercept raw water, removing impurities such as suspended matter and colloids, thereby improving water clarity. Activated carbon filters utilize the adsorption properties of activated carbon to remove harmful substances such as organic matter and residual chlorine, reducing total organic carbon (TOC) and chemical oxygen demand (COD) in the water and providing a good foundation for subsequent treatment. Hollow fiber membranes utilize their ultrafiltration pore size to remove bacteria, microorganisms, suspended matter, particulate matter, and organic macromolecules from the water, preventing fouling and scaling of reverse osmosis membranes and extending their service life.

[0005] As the primary link in a purified water system, the pretreatment system's effluent quality directly impacts the effectiveness of subsequent purification processes and the lifespan of membrane modules. Qualified pretreatment effluent can reduce the burden of subsequent treatment, improving the overall performance and quality of the purified water system. Furthermore, the pretreatment system protects reverse osmosis membranes from contamination and damage, reducing the frequency of membrane module replacement and maintenance costs. Therefore, properly configuring and optimizing the pretreatment system is crucial to the stable operation of purified water equipment.

[0006] Traditional pure water pretreatment typically utilizes sand filtration, multi-media filtration, and hollow fiber membranes. This process requires long lines, large equipment footprint, and regular filter media replacement. Hollow fiber membranes are self-supporting membranes with a loose structure and low compressive strength, which can lead to breakage and affect normal operation. Hollow fiber membranes require a sludge concentration of less than 6000ppm. During the hollow fiber membrane filtration process, the influent must be highly clear and low in suspended solids.

[0007] In view of this, it is necessary to explore a method that can reduce the floor space as much as possible and improve the strength of the filtration membrane. Utility Model Content

[0008] The technical solutions adopted in this utility model are as follows:

[0009] A purified water pretreatment system includes a tubular ultrafiltration tank, a raw water inlet pipeline, a concentrated water outlet pipeline, a produced water outlet pipeline, a forward wash pipeline, and a backwash pipeline.

[0010] The tubular ultrafiltration tank is cylindrical and filled with a tubular ultrafiltration membrane. One end of the tubular ultrafiltration tank is a raw water inlet, which is connected to the outlet of the raw water inlet pipeline. The other end of the tubular ultrafiltration tank is provided with a concentrated water outlet interface. The end of each tubular ultrafiltration membrane is connected to the concentrated water outlet interface, and the concentrated water outlet interface is connected to the concentrated water outlet pipeline. The side wall of the other end of the tubular ultrafiltration tank is provided with a water production port, which is connected to the water production outlet pipeline.

[0011] The raw water inlet pipeline is sequentially provided with a raw water inlet manual valve MV110, a raw water inlet check valve ZV101, an inlet pneumatic valve AV104, a circulation pump WP1002, and an inlet pressure gauge. Raw water enters the tubular ultrafiltration tank through the raw water inlet pipeline.

[0012] The water outlet pipeline is connected in sequence with a water pressure gauge, a water electromagnetic flowmeter, a water discharge pneumatic valve AV103, and a water discharge manual valve MV109. A cleaning water tank inlet pipeline is connected between the water electromagnetic flowmeter and the water discharge pneumatic valve AV103. The cleaning water tank inlet pipeline is connected to the cleaning water tank SX101. A water supply pneumatic valve AV106 is provided on the cleaning water tank inlet pipeline.

[0013] A forward wash pipeline is branched from the cleaning water tank SX101 and connected to the pipeline between the water inlet pneumatic valve AV104 and the raw water inlet check valve ZV101. A forward wash manual valve MV103 is installed on the forward wash pipeline.

[0014] Optionally, a backwash pipeline is branched from the cleaning water tank and connected to the pipeline between the water production pressure gauge and the water production electromagnetic flowmeter of the water production outlet pipeline. The backwash manual valve MV101, backwash pneumatic valve AV101, backwash pump WP1001 and backwash flowmeter are installed in sequence on the backwash pipeline.

[0015] Optionally, the backwash pipeline and the forward wash pipeline as well as the cleaning water tank discharge pipeline and the cleaning water tank outlet are respectively connected to the four interfaces of the four-way.

[0016] Optionally, two discharge pipelines are branched off from the downstream of the water inlet pressure gauge of the raw water pipeline, one of which is equipped with a tank air-discharging pneumatic valve AV102, and the other is equipped with a tank emptying manual valve MV102.

[0017] Optionally, the concentrate outlet pipeline is sequentially connected with a concentrate electromagnetic flowmeter, a concentrate pressure gauge, a concentrate discharge pneumatic valve AV105, and a concentrate discharge manual valve MV108, and an exhaust valve for air discharge is also connected upstream of the concentrate electromagnetic flowmeter.

[0018] Optionally, a concentrated water return line to the cleaning water tank is branched off between the concentrated water pressure gauge and the concentrated water discharge pneumatic valve AV105, and a forward wash return water manual valve MV105 is provided on the concentrated water return line to the cleaning water tank.

[0019] Optionally, a concentrate return raw water pipeline is branched out between the concentrate pressure gauge and the concentrate discharge pneumatic valve AV105 and connected to the pipeline between the circulation pump WP1002 and the water inlet pneumatic valve AV104. A circulating water volume adjustment manual valve MV107 and a circulating water check valve ZV102 are installed on the concentrate return raw water pipeline.

[0020] Optionally, the tubular ultrafiltration membrane is made of PVDF and has a filtration pore size of 30 nm.

[0021] Optionally, the circulation pump and backwash pump are variable frequency centrifugal pumps.

[0022] The utility model has the following beneficial effects:

[0023] (1) The purified water pretreatment system of this application overcomes the influent water quality requirements of hollow fiber membranes, and the activated sludge concentration of tubular ultrafiltration membranes can be relatively high. During the tubular membrane pressure filtration process, the pretreatment requirements for the influent liquid are low, and it can be directly used for softening surface water, groundwater, mine water, recycled water, etc. Therefore, sand filtration and carbon filtration are no longer required as pre-treatment, and compared with the traditional sand filtration plus hollow fiber filtration process, it can save 50% of space.

[0024] (2) The purified water pretreatment system of the present application adopts a sand-free pure water ultrafiltration process and directly uses an organic tubular ultrafiltration membrane as the filtration system. The tubular ultrafiltration membrane uses a non-woven fabric as a support layer, and has better mechanical strength.

[0025] (3) The filter element is a tubular ultrafiltration membrane, the equipment is stable and reliable, and easy to clean after blockage.

[0026] (4) The present application is provided with pneumatic butterfly valves and manual butterfly valves on multiple pipelines to prevent the pneumatic valves from being unable to open and close normally due to power outages or electrical failures. Parallel valves are used in pipelines with small water volumes that are prone to blockage. For example, in pipelines that are only occasionally discharged, AV102 and MV102 are two parallel valves. When one valve is blocked, the valve on the other pipeline can be used to control the discharge of raw water. Valves in series are used in pipelines with large water volumes that are prone to valve leakage. For example, the concentrated water outlet pipeline, the produced water outlet pipeline, and the raw water inlet pipeline all have large water volumes. For example, AV105 and MV108 on the concentrated water outlet pipeline 200 are connected in series. When one valve leaks, it will not cause the pipeline to leak, but the other valve can be used to control the on / off of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above features and technical advantages of the present invention will become clearer and easier to understand by describing the embodiments thereof in conjunction with the following drawings.

[0028] Figure 1 This is a process flow chart of the purified water pretreatment system according to an embodiment of the present application.

[0029] Figure 2 This is a schematic diagram of the structure of a tubular ultrafiltration tank according to an embodiment of the present application.

[0030] Reference numerals

[0031] Tubular ultrafiltration tank GT100, raw water inlet pipeline 100, concentrated water outlet pipeline 200, produced water outlet pipeline 300, forward washing pipeline 400, backwashing pipeline 500, raw water inlet manual valve MV110, raw water inlet check valve ZV101, inlet pneumatic valve AV104, circulating pump WP1002, inlet pressure gauge P102, produced water pressure gauge P101, produced water electromagnetic flowmeter A102, produced water discharge pneumatic valve AV103, produced water discharge manual valve MV109, cleaning water tank SX101, water supply pneumatic valve AV106, concentrated water electromagnetic flowmeter A101, concentrated water pressure gauge P103, concentrated water Discharge pneumatic valve AV105, concentrate discharge manual valve MV108, exhaust valve V101, forward wash return water manual valve MV105, circulating water volume adjustment manual valve MV107, circulating water check valve ZV102, forward wash manual valve MV103, backwash manual valve MV101, backwash pneumatic valve AV101, backwash pump WP1001, backwash flowmeter A103, water tank emptying manual valve MV106, tank body exhaust pneumatic valve AV102, tank body emptying manual valve MV102, raw water inlet GT101, produced water inlet GT102, concentrate outlet interface GT103, organic tubular ultrafiltration membrane 600. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims. Furthermore, throughout this specification, the drawings are not drawn to scale, and like reference numerals represent like parts.

[0033] This embodiment provides a purified water pretreatment system, including a purified water pretreatment filtration system and a cleaning and backwashing system. The filtration system is pressurized by raw water through a circulation pump and enters an organic tubular ultrafiltration tank. The organic tubular ultrafiltration tank is a cylindrical structure as a whole. The cylinder is densely covered with internal pressure organic tubular ultrafiltration membranes. The upper end of the tank is sealed with a flange. The raw water is fed into the tubular ultrafiltration tank through a circulation pump and enters the tubular ultrafiltration tank from the bottom. The produced water is filtered out from the outside of the upper end of the tank and is collected through a diversion device and enters the produced water tank from the water production pipeline outside the upper head of the tank. The concentrated water flows out from the top of the tank. A part of it re-enters the raw water pipeline through the pipeline valve control and is recirculated and filtered together with the raw water through the circulation pump. The other part of the concentrated water is discharged through the pipeline valve control. In order to reduce the impact of membrane pollution during filtration operation, the backwash system needs to be cleaned regularly. The shared water tank is used as the cleaning and backwashing tank. When cleaning, the water tank control valve is opened, and the water enters the ultrafiltration tank through the circulation pump to forward flush the membrane tube in the tank. For backwashing, the backwash pump controls the cleaning water through the pipeline valve to enter the water production pipeline outside the ultrafiltration tank. The backwash water is injected into the outside of the organic membrane tank of the tank body through the pipeline, and the organic tubular membrane is backwashed by the water pressure. After a period of backwashing, the operation is stopped and switched back to normal filtration operation.

[0034] like Figure 1 As shown, the purified water pretreatment system includes a tubular ultrafiltration tank GT100, a raw water inlet pipeline 100, a concentrated water outlet pipeline 200, a produced water outlet pipeline 300, a forward wash pipeline 400, and a backwash pipeline 500.

[0035] The tubular ultrafiltration tank GT100 is a stainless steel cylindrical structure, and a plurality of tubular ultrafiltration membranes are densely distributed inside the cylinder, which can be organic tubular ultrafiltration membranes. The lower part of the cylinder is the raw water inlet, which is connected to the outlet of the raw water inlet pipeline 100. The raw water enters the tubular ultrafiltration tank from the bottom and is distributed into each organic tubular ultrafiltration membrane. The produced water and concentrated water are discharged through filtration of the organic tubular ultrafiltration membrane.

[0036] Specifically, the raw water inlet pipeline 100 may be sequentially equipped with a raw water inlet manual valve MV110, a raw water inlet check valve ZV101, a water inlet pneumatic valve AV104, a circulation pump WP1002, and a water inlet pressure gauge P102. Raw water enters the tubular ultrafiltration tank through the raw water inlet pipeline 100. The raw water entering the tubular ultrafiltration tank further enters the organic tubular ultrafiltration membrane, where it is filtered.

[0037] The upper sidewall of the tubular ultrafiltration tank GT100 is equipped with a water outlet, which is connected to the water outlet pipeline 300. The water outlet pipeline 300 is connected to the water tank (not shown). The water outlet pipeline 300 is connected to the water pressure gauge P101, the water electromagnetic flowmeter A102, the water discharge pneumatic valve AV103, and the water discharge manual valve MV109. The wash water tank inlet pipeline is connected between the water electromagnetic flowmeter A102 and the water discharge pneumatic valve AV103, and is connected to the wash water tank SX101. A water supply pneumatic valve AV106 is installed on the wash water tank inlet pipeline, which controls the amount of water entering the wash water tank (wash and backwash tank) SX101.

[0038] The brine outlet port is located at the center of the upper end of the tubular ultrafiltration tank. The upper end of each organic tubular ultrafiltration membrane is connected to the brine outlet port at the upper end of the tubular ultrafiltration tank. The brine outlet port is in communication with the brine outlet pipeline 200. The brine passes through the organic tubular ultrafiltration membrane and flows to the brine outlet port at the center of the upper end of the tubular ultrafiltration tank and enters the brine outlet pipeline 200.

[0039] The brine outlet port of the tubular ultrafiltration tank GT100 is connected to the brine outlet pipeline 200, which is connected in sequence to a brine electromagnetic flowmeter A101, a brine pressure gauge P103, a brine discharge pneumatic valve AV105, and a brine discharge manual valve MV108. Furthermore, an air vent valve V101 is connected upstream of the brine electromagnetic flowmeter A101 to allow for air release. A brine return line to the wash water tank branches off between the brine pressure gauge P103 and the brine discharge pneumatic valve AV105. This brine return line is equipped with a forward wash return manual valve MV105. After entering the brine outlet pipeline 200, a portion of the brine is discharged via the forward wash return manual valve AV105 and the brine discharge manual valve MV108, depending on the water production status. The remaining portion of the brine is allowed to enter the wash water tank SX101 through the brine return line to the wash water tank. A brine return line branches off between the brine pressure gauge P103 and the brine discharge pneumatic valve AV105, connecting to the pipeline between the circulation pump WP1002 and the water inlet pneumatic valve AV104. This brine return line is equipped with a manual circulating water flow control valve MV107 and a circulating water check valve ZV102. The manual circulating water flow control valve MV107 and the circulating water check valve ZV102 control the amount of brine returning to the raw water pipeline. The brine then reenters the circulation pump with the raw water for ultrafiltration.

[0040] To mitigate the effects of membrane fouling during filtration, the system requires regular cleaning and backwashing. The wash tank SX101 serves as a shared water tank for both cleaning and backwashing. A forward wash line branches from the wash tank SX101 and connects to the line between the pneumatic inlet valve AV104 and the raw water inlet check valve ZV101. The pneumatic inlet valve AV104 automates the forward wash, while the raw water inlet check valve ZV101 prevents water leakage. A manual forward wash valve MV103 is installed on the forward wash line. After each batch of water is processed or after a period of operation, a circulating pump WP1002 pumps the produced water from the wash tank SX101 into the ultrafiltration tank for forward flushing of the organic membrane tubes within the tank. During cleaning, open the forward wash manual valve MV103 at the outlet of the cleaning water tank SX101, and the produced water enters the circulation pump through the pipeline and enters the ultrafiltration tank under pressure to perform forward flushing on the membrane tubes in the tank. The forward flushing concentrated water is output from the concentrated water pipe at the upper part of the ultrafiltration tank, close the forward wash return water manual valve MV105, open the concentrated water discharge pneumatic valve AV105 and the concentrated water discharge manual valve MV108 to directly discharge the flushing concentrated water.

[0041] A backwash line also branches from the wash water tank SX101 and connects to the line between the produced water pressure gauge P101 and the produced water electromagnetic flowmeter A102 in the produced water outlet line 300. The backwash line is equipped with a backwash manual valve MV101, a backwash pneumatic valve AV101, a backwash pump WP1001, and a backwash flowmeter A103. During regular backwashing, open the backwash pneumatic valve AV101 and the backwash manual valve MV101 at the outlet of the cleaning water tank SX101, and let the produced water enter the backwash pump WP101 through the pipeline valve control. The backwash pump pressurizes the cleaning water and enters the ultrafiltration tank through the produced water outlet pipeline. The backwash water enters the inside of the organic tubular ultrafiltration membrane from the outside of the organic tubular ultrafiltration membrane, and the organic tubular ultrafiltration membrane is backwashed by the water pressure. The backwash produced water enters the concentrated water pipeline through the concentrated water pipeline at the top of the ultrafiltration tank, close the forward wash return water manual valve MV105, and open the concentrated water discharge pneumatic valve AV105 and the concentrated water discharge manual valve MV108 to directly discharge the flushing concentrated water.

[0042] Furthermore, the backwash pipeline and the forward wash pipeline as well as the cleaning water tank discharge pipeline and the cleaning water tank interface are connected to the four interfaces of the four-way. A water tank emptying manual valve MV106 is installed on the cleaning water tank discharge pipeline.

[0043] In addition, two discharge pipelines are branched from the downstream of P102 of the raw water pipeline 100. One discharge pipeline is installed with a tank air discharge pneumatic valve AV102, and the other discharge pipeline is installed with a tank emptying manual valve MV102.

[0044] It should be noted that this application is equipped with pneumatic butterfly valves and manual butterfly valves on multiple pipelines. Their main function is to prevent the pneumatic valves from being unable to open and close normally due to power outages or electrical failures. Manual valves can then be used to operate the pipelines. Parallel valves are used in pipelines with low water volume and prone to clogging. For example, the tank air discharge pneumatic valve AV102 and the tank emptying manual valve MV102 are two parallel valves. If one valve becomes clogged, the valve on the other pipeline can be used to control the discharge of raw water. Valves connected in series are used in pipelines with high water volume and prone to valve leakage. For example, the concentrated water discharge pneumatic valve AV105 and the concentrated water discharge manual valve MV108 on the concentrated water outlet pipeline 200 are connected in series. If one valve leaks, it will not cause the pipeline to leak, but the other valve can be used to control the pipeline's opening and closing.

[0045] Optionally, the ultrafiltration tank is densely covered with an organic tubular ultrafiltration membrane as a filter element, and the material of the organic tubular ultrafiltration membrane is PVDF (polyvinylidene fluoride) with a filtration pore size of 30 nm.

[0046] Optionally, the organic tubular ultrafiltration membrane used in the ultrafiltration tank is a special organic membrane tank that can withstand a negative 1KGF pressure.

[0047] Optionally, the circulating pump is a centrifugal pump that can adjust flow and pressure by variable frequency.

[0048] Optionally, the backwash pump is a high-flow, low-pressure variable-frequency centrifugal pump.

[0049] Optionally, the cleaning water tank can be used to collect produced water and can also be used to clean the backwash water tank.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A purified water pretreatment system, characterized in that: Including tubular ultrafiltration tank, raw water inlet pipeline, concentrated water outlet pipeline, produced water outlet pipeline, forward washing pipeline and backwash pipeline, The tubular ultrafiltration tank is cylindrical and filled with a tubular ultrafiltration membrane. One end of the tubular ultrafiltration tank is a raw water inlet, which is connected to the outlet of the raw water inlet pipeline. The other end of the tubular ultrafiltration tank is provided with a concentrated water outlet interface. The end of each tubular ultrafiltration membrane is connected to the concentrated water outlet interface, and the concentrated water outlet interface is connected to the concentrated water outlet pipeline. The side wall of the other end of the tubular ultrafiltration tank is provided with a water production port, which is connected to the water production outlet pipeline. The raw water inlet pipeline is sequentially provided with a raw water inlet manual valve (MV110), a raw water inlet check valve (ZV101), an inlet pneumatic valve (AV104), a circulation pump (WP1002), and an inlet pressure gauge. Raw water enters the tubular ultrafiltration tank through the raw water inlet pipeline. The water outlet pipeline is connected in sequence with a water pressure gauge, a water electromagnetic flowmeter, a water discharge pneumatic valve (AV103), and a water discharge manual valve (MV109). A cleaning water tank inlet pipeline is connected between the water electromagnetic flowmeter and the water discharge pneumatic valve (AV103). The cleaning water tank inlet pipeline is connected to the cleaning water tank (SX101). A water supply pneumatic valve (AV106) is provided on the cleaning water tank inlet pipeline. A forward wash pipeline is branched from the cleaning water tank (SX101) and connected to the pipeline between the water inlet pneumatic valve (AV104) and the raw water inlet check valve (ZV101). A forward wash manual valve (MV103) is installed on the forward wash pipeline.

2. The purified water pretreatment system according to claim 1, characterized in that: A backwash pipeline is also branched from the cleaning water tank and connected to the pipeline between the water production pressure gauge and the water production electromagnetic flowmeter of the water production outlet pipeline. A backwash manual valve (MV101), a backwash pneumatic valve (AV101), a backwash pump (WP1001), and a backwash flowmeter are installed on the backwash pipeline in sequence.

3. The purified water pretreatment system according to claim 2, characterized in that: The backwash pipeline and the forward wash pipeline as well as the cleaning water tank discharge pipeline and the cleaning water tank outlet are respectively connected to the four interfaces of the four-way.

4. The purified water pretreatment system according to claim 1, characterized in that: Two discharge pipelines are further branched from the downstream of the water inlet pressure gauge of the raw water inlet pipeline. One discharge pipeline is equipped with a tank air-discharging pneumatic valve (AV102), and the other discharge pipeline is equipped with a tank emptying manual valve (MV102).

5. The purified water pretreatment system according to claim 1, characterized in that: The concentrated water outlet pipeline is sequentially connected with a concentrated water electromagnetic flowmeter, a concentrated water pressure gauge, a concentrated water discharge pneumatic valve (AV105), and a concentrated water discharge manual valve (MV108), and an exhaust valve for air discharge is also connected upstream of the concentrated water electromagnetic flowmeter.

6. The purified water pretreatment system according to claim 5, characterized in that: A concentrated water return line for the cleaning water tank is branched off between the concentrated water pressure gauge and the concentrated water discharge pneumatic valve (AV105), and a forward wash return water manual valve (MV105) is provided on the concentrated water return line for the cleaning water tank.

7. The purified water pretreatment system according to claim 5, characterized in that: A concentrated water return raw water pipeline is also branched off between the concentrated water pressure gauge and the concentrated water discharge pneumatic valve (AV105) and connected to the pipeline between the circulating pump (WP1002) and the water inlet pneumatic valve (AV104). A circulating water volume adjustment manual valve (MV107) and a circulating water check valve (ZV102) are installed on the concentrated water return raw water pipeline.

8. The purified water pretreatment system according to claim 1, characterized in that: The tubular ultrafiltration membrane is made of PVDF and has a filtration pore size of 30 nm.

9. The purified water pretreatment system according to claim 2, characterized in that: The circulation pump and backwash pump are variable frequency centrifugal pumps.

Images