A treatment process and device for improving desalted water recovery efficiency and water quality

Abstract

The application provides a treatment device and method for improving desalinated water recovery efficiency and water quality, which comprises a self-cleaning filter, an inverted water distributor, a reverse osmosis device and a water storage tank connected in sequence, and a plurality of detachable filtering devices are arranged in the water distribution pipe of the inverted water distributor, wherein quartz sand filtering devices, activated carbon filtering devices and ultrafiltration devices are arranged in sequence from top to bottom. The treatment process and device for improving desalinated water recovery efficiency and water quality realize efficient recovery and good water quality of filtered water by using the inverted water distributor, so that the desalinated water passes through a plurality of filtering devices under the influence of its own gravity and is finally treated by reverse osmosis.

Description

TECHNICAL FIELD

[0001] The present application relates to a desalted water treatment process, in particular to a treatment process and device for improving the recovery efficiency and water quality of desalted water. BACKGROUND

[0002] Water resources are important natural resources, and desalted water is widely used in various fields, especially in the industrial field. The conventional water resource utilization rate of using surface water to produce desalted water is about 60%, and 23% of high turbidity sewage and about 17% of salt-containing wastewater are generated, which is a low water resource utilization rate, and this is also a problem faced by water treatment units.

[0003] There are mainly three methods for producing desalted water:

[0004] ① Distillation method, heating and evaporating the salt-containing water, and condensing the steam to obtain desalted water;

[0005] ② Ion exchange method, making salt-containing water pass through an exchange column (see ion exchange) filled with zeolite or ion exchanger, and the calcium, magnesium and other ions are left on the exchange column, and the filtered water is desalted water;

[0006] ③ Electrodialysis method, taking advantage of the selective permeability of ion exchange membrane to ions, under the action of an external electric field, the cations and anions in the water between the two ion exchange membranes are concentrated to the negative and positive poles through the exchange membranes, respectively. The area between the membranes becomes a fresh water area, and the area outside the membranes becomes a concentrated water area. The water drawn from the fresh water area is desalted water.

[0007] Distillation method is mainly used in laboratories to clean containers or prepare solutions, and is suitable for places with small quantities and high purity requirements. Ion exchange method and electrodialysis method are mainly used in chemical industry, such as boiler water, which can reduce fouling and corrosion, and are suitable for places with large quantities and not very high purity requirements.

[0008] Therefore, for desalted water with a large amount of use, how to improve the recovery efficiency and improve the water quality is a problem to be considered. SUMMARY

[0009] The present application provides a treatment process and device for improving the recovery efficiency and water quality of desalted water, which solves the problem of improving the recovery efficiency and water quality of desalted water, and the technical scheme is as follows:

[0010] A treatment device for improving the recovery efficiency and water quality of desalted water, comprising a self-cleaning filter, an inverted water distributor, a reverse osmosis device and a water storage tank connected in sequence, a plurality of detachable filter devices are arranged in the water distribution pipe of the inverted water distributor, and from top to bottom, quartz sand filter device, activated carbon filter device and ultrafiltration device are arranged in sequence.

[0011] The self-cleaning filter is connected to each water pipe of the inverted water distributor via a flat water storage device, which is a flat water storage container.

[0012] The water distribution pipes are provided in 8 to 12 sets.

[0013] The water distribution pipe is equipped with an observation window.

[0014] The reverse osmosis device and the water storage tank are connected by a transparent pipe, and an ultraviolet disinfection device is installed on the outside of the transparent pipe.

[0015] Valves are installed in the pipes between the multiple filter sections.

[0016] A treatment method for improving desalination water recovery efficiency and product water quality includes the following steps:

[0017] S1: The demineralized water to be recovered is filtered through a self-cleaning filter;

[0018] S2: Use the filter device in the water distribution pipe of the inverted water distributor for re-filtration;

[0019] S3: Processed by a reverse osmosis device connected to an inverted water distributor;

[0020] S4: Disinfect the demineralized water after treatment by the reverse osmosis unit;

[0021] S5: Storage.

[0022] In step S3, the filtration device includes a quartz sand filtration device, an activated carbon filtration device, and an ultrafiltration device connected in sequence.

[0023] In step S3, the filter device is detachably fixed to the water distribution pipe.

[0024] The aforementioned treatment process and apparatus for improving the recovery efficiency of desalinated water and the quality of produced water utilizes an inverted water distributor to allow the desalinated water to pass through multiple filtration devices under its own gravity, and finally undergo reverse osmosis treatment, thereby achieving high-efficiency recovery and producing good quality filtered water. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the treatment device for improving the desalination water recovery efficiency and the quality of the produced water;

[0026] Figure 2 This is a flowchart of the steps in the treatment method for improving the desalination water recovery efficiency and the quality of the produced water. Detailed Implementation

[0027] like Figure 1As shown, the treatment device for improving the desalination water recovery efficiency and product water quality includes a self-cleaning filter 1, an inverted water distributor 2, a reverse osmosis device 8, and a water storage tank 10 connected in sequence. The water distribution pipe 3 of the inverted water distributor 2 is equipped with multiple detachable filter devices, which are arranged from top to bottom as a quartz sand filter 4, an activated carbon filter 5, and an ultrafiltration device 6.

[0028] The self-cleaning filter 1 is used to perform preliminary filtration of the desalinated water that needs to be recycled, filtering out larger particles of impurities. An inlet is provided on one side of the self-cleaning filter, and a water pump is provided at the inlet to introduce the desalinated water to be recycled. The outlet on the other side of the self-cleaning filter 1 is connected to a flat water storage device.

[0029] The self-cleaning filter 1 is a precision device that uses a filter screen to directly intercept impurities in the water, remove suspended solids and particulate matter, reduce turbidity, purify water quality, and reduce the generation of system dirt, bacteria, algae, rust, etc., in order to purify water quality and protect the normal operation of other equipment in the system. Water enters the self-cleaning filter body through the inlet. Due to the intelligent design (PLC, PAC), the system can automatically identify the degree of impurity deposition and send a signal to the drain valve to automatically discharge all the sewage.

[0030] In the self-cleaning filter 1, water enters the filter through the inlet, first passing through the coarse filter element to remove larger particles of impurities, and then reaching the fine filter screen. After the fine filter screen removes smaller particles of impurities, the clean water is discharged from the outlet.

[0031] During the filtration process, impurities gradually accumulate on the inner layer of the fine filter screen, creating a pressure difference between its inner and outer sides. When this pressure difference reaches a preset value, the automatic cleaning process begins: the drain valve opens, the hydraulic motor chamber and hydraulic cylinder of the main component release pressure and discharge water; the pressure in the hydraulic motor chamber and suction pipe drops significantly, and due to the negative pressure, dirt on the inner wall of the fine filter screen is sucked up through the suction nozzle, flows into the hydraulic motor chamber through the hydraulic motor, and is discharged through the drain valve, forming a suction process. When water flows through the hydraulic motor, it drives the suction pipe to rotate, and the piston of the hydraulic cylinder drives the suction pipe to move axially. The suction assembly, through the combination of axial and rotational movements, completely cleans the entire inner surface of the filter screen. The entire cleaning process lasts for tens of seconds. The drain valve closes at the end of the cleaning process, and the increased water pressure causes the piston of the hydraulic cylinder to return to its initial position, and the filter begins to prepare for the next flushing cycle. During the cleaning process, the normal filtration operation of the filter continues uninterrupted.

[0032] The flat water storage device is a flat water storage container with an opening on its upper surface that connects to the outlet of the self-cleaning filter 1, and multiple openings on its lower surface that connect to the various water distribution pipes 3 of the inverted water distributor 2.

[0033] A cone is provided on the inner bottom of the flat water storage device, which allows water to flow from the center of the device to the periphery. The cone is 1.5cm to 4cm high at its center.

[0034] The inverted water distributor 2 is equipped with multiple water distribution pipes 3. In this embodiment, only one ring of water distribution pipes 3 is used. There are 8 to 12 sets of water distribution pipes 3. After the demineralized water to be recovered enters the water distribution pipe 3, it will accelerate downward under the influence of its own gravity. However, this process will be filtered. When the water distribution pipe 3 is full of demineralized water to be recovered, the pressure of the demineralized water to be recovered below will be affected by the demineralized water to be recovered above, thus increasing the pressure. Under the influence of pressure, the filtration speed can be increased, thereby improving efficiency.

[0035] The water distributor distributes water in a certain pattern over a specific working area, most commonly by evenly distributing water on the working surface. However, in this invention, it is necessary to consider the ability to collect the purified water, in contrast to the flat plate water storage device mentioned above.

[0036] The water distribution pipe 3 is equipped with multiple filtration devices, including a quartz sand filter 4, an activated carbon filter 5, and an ultrafiltration device 6, arranged from top to bottom. The desalinated water to be recovered will enter the reverse osmosis unit 8 for further processing after further filtration. An observation window 7 is provided at the lower end of the ultrafiltration device 6. This window allows for assessment of the filtration process within the water distribution pipe. If the water flow is weak, the filtration devices in the water distribution pipe 3 may need replacement. Valves are installed between the multiple filtration devices, and the filtration devices are fixedly connected to the pipes via flanges for easy replacement.

[0037] The purpose of the valve is to replace the filter device. For ease of operation, a control valve is provided at the upper end of each section of the water distribution pipe 3. Whenever the filter device below needs to be replaced, the control valve of that section can be closed, and then the flange can be loosened to complete the replacement.

[0038] The reverse osmosis device 8 passes the desalinated water through a fine filter, a granular activated carbon filter, a compressed activated carbon filter, etc., and then pressurizes it with a pump. Using a reverse osmosis membrane (RO membrane) with a pore size of 1 / 10000μm (equivalent to 1 / 6000 the size of E. coli and 1 / 300 the size of a virus), the high-concentration water is transformed into low-concentration water. At the same time, it isolates all impurities such as industrial pollutants, heavy metals, bacteria, and viruses that are mixed into the water, thereby meeting the physicochemical indicators and hygiene standards for drinking water and producing the clearest and purest water.

[0039] The reverse osmosis unit 8 and the water storage tank 10 are connected by a transparent pipe. An ultraviolet disinfection device 11 is installed on the outside of the transparent pipe. The ultraviolet disinfection device 11 sterilizes the desalinated water flowing through the transparent pipe.

[0040] The water in the water storage tank 10 can be treated as recycled desalinated water.

[0041] The treatment method for improving desalination water recovery efficiency and product water quality, such as Figure 2 As shown, it includes the following steps:

[0042] S1: The demineralized water to be recovered is filtered through a self-cleaning filter;

[0043] S2: Use the filter device in the water distribution pipe of the inverted water distributor for re-filtration;

[0044] S3: Processed by a reverse osmosis device connected to an inverted water distributor;

[0045] S4: Disinfect the demineralized water after treatment by the reverse osmosis unit;

[0046] S5: Storage.

[0047] In step S3, the filtration device includes a quartz sand filtration device 4, an activated carbon filtration device 5, and an ultrafiltration device 6 connected in sequence.

[0048] Each filter device is detachably installed on the water distribution pipe 3.

[0049] Based on the above-described preferred embodiments of the invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this invention. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

[0050] The aforementioned treatment process and apparatus for improving the recovery efficiency of desalinated water and the quality of produced water utilizes an inverted water distributor to allow the desalinated water to pass through multiple filtration devices under its own gravity, and finally undergo reverse osmosis treatment, thereby achieving high-efficiency recovery and producing good quality filtered water.

Claims

1. A treatment device for improving desalinated water recovery efficiency and product water quality, characterized in that: The device includes a self-cleaning filter, an inverted water distributor, a reverse osmosis unit, and a water storage tank connected in sequence. The inverted water distributor has multiple detachable filter sections in its distribution pipes, arranged from top to bottom as a quartz sand filter, an activated carbon filter, and an ultrafiltration unit. The self-cleaning filter is connected to each distribution pipe of the inverted water distributor via a flat water storage device, which is a flat water storage container. There are 8 to 12 sets of distribution pipes. Each distribution pipe has an observation window. The reverse osmosis unit and the water storage tank are connected by a transparent pipe, the outside of which is equipped with an ultraviolet disinfection device. Valves are installed between the multiple filter sections.

2. A treatment method for improving desalination water recovery efficiency and permeate water quality, using the treatment apparatus for improving desalination water recovery efficiency and permeate water quality as described in claim 1, comprising the following steps: S1: The demineralized water to be recovered is filtered through a self-cleaning filter; S2: Use the filter device in the water distribution pipe of the inverted water distributor for re-filtration; S3: Processed by a reverse osmosis device connected to an inverted water distributor; S4: Disinfect the demineralized water after treatment by the reverse osmosis unit; S5: Storage.

3. The treatment method for improving desalination water recovery efficiency and product water quality according to claim 2, characterized in that: In step S3, the filtration device includes a quartz sand filtration device, an activated carbon filtration device, and an ultrafiltration device connected in sequence.

4. The treatment method for improving desalination water recovery efficiency and product water quality according to claim 2, characterized in that: In step S3, the filter device is detachably fixed to the water distribution pipe.

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