WO2022183628A1

WO2022183628A1 - Pretreatment integrated spiral-wound ro membrane element and reverse osmosis filter element comprising same

Info

Publication number: WO2022183628A1
Application number: PCT/CN2021/101181
Authority: WO
Inventors: 朴济成
Original assignee: 韩佳（上海）环保设备有限公司
Priority date: 2021-03-02
Filing date: 2021-06-21
Publication date: 2022-09-09

Abstract

A pretreatment integrated spiral-wound RO membrane element, comprising RO membranes (1), wherein composite layers (2) used for pretreating raw water are arranged on contact faces of the RO membranes (1) that come in contact with the raw water. The following problems in the prior art are solved: integrating pretreatment and RO membrane filtration of raw water, thereby reducing the size of a filtering apparatus; and avoiding frequent replacement caused by filter elements having different functions.

Description

A pretreatment integrated roll-type RO membrane element and its reverse osmosis filter element

technical field

The invention relates to the technical field of water filtering equipment, in particular to a pretreatment integrated roll-type RO membrane element and a reverse osmosis filter element thereof.

Background technique

In the prior art, the RO membrane is a relatively expensive filter component. In order to protect the RO membrane and prolong its service life, the raw water needs to be pretreated before entering the reverse osmosis filter where the RO membrane is located. Install a separate pretreatment device to achieve pretreatment, such as adding a separate carbon rod filter for residual chlorine adsorption and/or adding a non-woven fabric for impurity adsorption, etc., which makes the entire water filter machine bulky, and each filter with different functions. The life of the filter element is different, the cost of replacing the consumables and the labor cost of the filter element is high, and it is also easy to replace it in the past, resulting in unstable protection of the water quality RO membrane.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a pretreatment integrated roll-type RO membrane element and its reverse osmosis filter element, which mainly solves the above-mentioned problem 1 of the prior art, how to integrate the pretreatment of the raw water with the RO membrane filtration, The problem of reducing the volume of the filtration equipment; the second problem: to avoid the problem of high-frequency replacement caused by different functional filter elements, and provide a pretreatment integrated roll-type RO membrane element and its reverse osmosis filter element.

In order to achieve the above purpose, the technical solution adopted in the present invention is: a pretreatment integrated roll-type RO membrane element, including RO membrane sheet, characterized in that: the contact surface of the RO membrane sheet in contact with the raw water is provided with Preprocessed composite layers.

Further, the pretreated composite layer includes a composite layer for removing residual chlorine and/or removing impurities and/or descaling the raw water before the RO membrane filters the raw water.

Further, the composite layer is carbon fiber cloth and/or PP cotton and/or cloth and/or non-woven fabric and/or carbon powder layer and/or carbon particle layer and/or ion exchange resin.

Further, the composite layer is one layer, and the side of the composite layer facing away from the RO diaphragm is provided with a water inlet layer or the side of the composite layer facing the RO diaphragm is provided with a water inlet layer;

Or the composite layer is more than two layers, and the composite layer is provided with a water inlet layer and/or the outermost layer between the composite layer and the composite layer. Influent layer cross setting.

Further, the composite layer is one layer, the water inlet layer is one layer, and the pretreatment-integrated roll-type RO membrane element is formed by stacking the RO membrane, the composite layer and the water inlet layer layer by layer in sequence;

Or the composite layer is one layer, the water inlet layer is two layers, and the pretreatment-integrated roll-type RO membrane element is formed by stacking the RO membrane sheet, the water inlet layer, the composite layer and the water inlet layer in sequence;

Or the composite layer is two layers, the water inlet layer is three layers, and the pretreatment integrated roll-type RO membrane element is sequentially composed of the RO membrane, the water inlet layer, the composite layer, the water inlet layer, the composite layer and the water inlet layer. Layer upon layer settings.

A reverse osmosis filter element, characterized in that: the reverse osmosis filter element comprises the above-mentioned pretreatment integrated roll-type RO membrane element, the two RO membrane sheets form a group, and the two RO membrane sheets in each group are formed between the two RO membrane sheets. The space used for the gathering of purified water after filtration;

The contact surface of one RO membrane sheet in each group that contacts the raw water is provided with a composite layer for pre-processing the raw water; Processed composite layers.

Further, the space communicates with the central tube cavity, and a water-producing layer is arranged in the space.

A reverse osmosis filter element, characterized in that: the reverse osmosis filter element includes the above-mentioned one pretreatment integrated roll-type RO membrane element, the two RO membrane sheets form a group, and the two RO membrane sheets in each group are between the two RO membrane sheets. A space for gathering purified water after filtration is formed between them;

Further, the composite layer is one layer, which is a carbon fiber cloth layer;

Or the composite layer is two layers, which are carbon fiber cloth layer and PP cotton layer respectively.

In view of the above-mentioned technical features, the present invention has the following beneficial effects:

1. In the RO membrane of the present invention, which is a pretreatment-integrated roll-type RO membrane element, the functions required for pretreatment are realized by adding a composite layer 2 on the RO membrane 1, and there is no need to set up each It can save costs and greatly reduce the overall space occupied by the filtering equipment.

2. Because there is no pre-treatment filter element or component with various functions, the replacement of the pre-treatment filter element or component is avoided, the cost of consumables and labor costs are saved, and the product of the present invention is more affordable.

3. Because there are no pre-processing filter elements or components with various functions, it avoids the problem of needing to be replaced according to different time limits due to the different service lives of the pre-processing filter elements or components (it is often easy to replace one or several of them). The pre-treatment of a separate filter element causes damage to the RO diaphragm 1, and the loss is relatively large). Reduce the possibility of damage to the RO diaphragm. It also avoids the problem of high frequency replacement due to different functional filter elements.

Description of drawings

FIG. 1 is a schematic structural diagram of a pretreatment-integrated roll-type RO membrane element in Example 1 (single-layer composite layer, no water inlet cloth).

FIG. 2 is a schematic structural diagram of a pretreatment-integrated roll-type RO membrane element in Example 1 (two-layer composite layer, no water inlet cloth).

Figure 3 is a schematic structural diagram of a pretreatment-integrated roll-type RO membrane element in Example 2 (single-layer composite layer, with a single-layer water inlet cloth, RO membrane 1, composite layer 2 and water inlet layer 3 are sequentially layered layer overlay settings).

Figure 4 is a schematic structural diagram of a pretreatment-integrated roll-type RO membrane element in Example 2 (two-layer composite layer, a single-layer water inlet cloth, RO membrane sheet 1, composite layer 2, composite layer 2 and water inlet Layer 3 is set layer by layer in sequence).

5 is a schematic structural diagram of a pretreatment integrated roll-type RO membrane element in Example 2 (two-layer composite layers, a single-layer water inlet cloth, RO membrane sheet 1, water inlet layer 3, composite layer 2 and inlet The water layers 3 are arranged layer by layer in sequence).

6 is a schematic structural diagram of a pretreatment integrated roll-type RO membrane element in Example 2 (two layers of composite layers, three layers of water inlet cloth, RO membrane sheet 1, water inlet layer 3, composite layer 2, water inlet Layer 3, composite layer 2 and water inlet layer 3 are arranged layer by layer in sequence).

In the figure: 1. RO membrane; 2. Composite layer; 3. Water inlet layer; 4. Water production layer.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

The so-called "raw water" refers to the water entering the filter element (such as reverse osmosis filter element) to be filtered, or the unfiltered water; the so-called "clean water" refers to the clean water that meets the safety standards after being filtered by the RO membrane 1, , the so-called "sewage" refers to the remaining sewage that does not meet the safety standards after being filtered by the RO membrane 1 (such as water containing many impurities and/or high residual chlorine and/or containing a lot of scale). RO membrane 1 refers to a reverse osmosis membrane, which is generally used in a reverse osmosis filter element. The so-called "pretreatment integrated roll-type RO membrane element" refers to adding a composite layer 2 with a pretreatment function on the RO membrane, and then using it in a single reverse osmosis filter element, that is, a single reverse osmosis filter element. The pretreatment function can be performed in the filter itself, and there is no need to prepend other devices and/or equipment for pretreatment of the raw water entering the filter element (for protecting the RO membrane 1, such as preventing the RO membrane 1 from being worn by impurities and/or To help pre-treat residual chlorine, these can help prolong the service life of the RO membrane 1). At this time, the RO membrane 1 with the additional composite layer is a pre-integrated roll-type RO membrane element.

Referring to FIGS. 1 to 2, the specific embodiment 1 provides a pretreatment integrated roll-type RO membrane element, including the RO membrane 1, and the contact surface of the RO membrane 1 in contact with the raw water is provided with a For the composite layer 2 pretreated with raw water.

The functions required for pretreatment are realized by adding a composite layer 2 on the RO membrane 1, and there is no need to pre-install pretreatment filter elements or components with various functions, which saves costs and greatly reduces the overall occupation of the filtration equipment. size of space.

Secondly, because there is no pretreatment filter element or component with various functions, the replacement problem of the pretreatment filter element or component is avoided, the cost of consumables and labor costs are saved, and the product of the present invention is more affordable.

Thirdly, because there are no pretreatment filter elements or components with various functions in the front, the problem of needing to be replaced according to different time limits due to the different service lives of the pretreatment filter elements or components is avoided (it is often easy to replace one or several of them). The pre-treatment of a separate filter element will cause damage to the RO membrane 1, and the loss will be larger). , reducing the possibility of damage to the RO diaphragm 1.

Finally, according to the actual requirements for the protection of the RO membrane 1 and/or for further purification of water, various water purification requirements and/or protection requirements for the RO membrane 1 can be met through multiple composite layers 2 with different functions. More convenient, better water purification effect.

The pretreated composite layer 2 includes a composite layer 2 for removing residual chlorine and/or removing impurities and/or descaling the raw water before the RO membrane 1 filters the raw water.

The composite layer 2 is carbon fiber cloth and/or PP cotton and/or cloth and/or non-woven fabric and/or carbon powder layer and/or carbon particle layer and/or ion exchange resin.

Assuming that a piece of RO membrane 1 is taken as an example, when the RO membrane 1 and the composite layer 2 are rolled synchronously to form an RO membrane filter element, the composite layer 2 also plays the role of separating the RO membrane 1, preventing the RO membrane 1 from interacting with each other. The friction causes damage to the RO diaphragm 1 .

For example, referring to FIG. 1 , the composite layer 2 is one layer, and the contact surface of the RO membrane 1 in contact with the raw water is provided with a composite layer 2 for pretreatment of the raw water, that is to say, the RO membrane 1 and the composite layer 2 are sequentially The settings are stacked one after the other.

For example, referring to FIG. 2, the composite layer 2 is two layers, and the contact surface of the RO membrane 1 in contact with the raw water is provided with two layers of composite layers 2 for pretreatment of the raw water, that is to say, the RO membrane 1, the composite layer 2 are sequentially Layer 2 and composite layer 2 are arranged layer by layer in sequence.

Referring to FIG. 3 and FIG. 6, the specific embodiment 2, the embodiment 2 provides a pretreatment integrated roll-type RO membrane element. The difference between the embodiment 2 and the embodiment 1 is that the water inlet layer 3 is added, such as the described The composite layer 2 is one layer, and the side of the composite layer 2 facing away from the RO membrane 1 is provided with a water inlet layer 3, that is, the RO membrane 1, the composite layer 2 and the water inlet layer 3 are arranged layer by layer in sequence, see Figure 3; When the RO membrane 1 and the composite layer 2 are simultaneously curled to form the RO membrane filter element, the water inlet layer 3 increases the water inlet speed, and/or separates the curled composite layer 2 from the composite layer 2 .

As an alternative, the composite layer 2 can be more than two layers, and the water inlet layer 3 and/or the outermost composite layer 2 is provided between the composite layer 2 and the composite layer 2 on the side facing away from the RO membrane 1. A water inlet layer 3 and/or a composite layer 2 and a water inlet layer 3 are arranged crosswise. The outermost composite layer 2 refers to the layer of composite layer 2 that is farthest from the RO membrane 1. Between the composite layer 2 and the RO membrane 1, there are more than one other composite layer 2. The outermost composite layer 2 It can be a composite layer 2 with the same function or a composite layer 2 with different functions.

For example, the composite layer 2 is two layers, and the water inlet layer 3 is one layer (see Figure 4). At this time, the RO membrane 1, the composite layer 2, the composite layer 2 and the water inlet layer 3 are stacked in sequence.

Of course, the water inlet layer 3 can also be more than two layers, and the water inlet layer 3 and the composite layer 2 are crossed. For example, the water inlet layer 3 is two layers, and the composite layer 2 is one layer (see Figure 5). , the water inlet layer 3, the composite layer 2 and the water inlet layer 3 are arranged layer by layer in sequence.

For example, the water inlet layer 3 is three layers, and the composite layer 2 is two layers (see Figure 6). At this time, the RO membrane 1, the water inlet layer 3, the composite layer 2, the water inlet layer 3, the composite layer 2 and the water inlet layer 3 The settings are stacked one after the other.

At this time, when the composite layers 2 all have the same pretreatment function, a water inlet layer 3 is arranged between the

composite layers

2 and 2 to help improve the water inlet speed.

When the composite layer 2 has various pretreatment functions, the outermost composite layer 2 is provided with a water inlet layer 3 on the side facing away from the RO membrane 1. In order to help the water inlet, all the raw water can pass through all the After the composite layer 2 of various pretreatment functions is pretreated, it enters the RO membrane 1 for filtration.

A reverse osmosis filter element, characterized in that: the reverse osmosis filter element includes the above-mentioned pretreatment integrated roll-type RO membrane element, the two RO membrane sheets 1 form a group, and the two RO membrane sheets 1 in each group are formed. A water-producing layer 4 is formed in the space for collecting purified water after filtration, and this space is connected to the central tube cavity. use.

The contact surface of one RO membrane sheet 1 in each group that contacts the raw water is provided with a composite layer 2 for pre-processing the raw water; or the contact surfaces of the two RO membrane sheets 1 in each group that contact the raw water are provided for Raw water for pretreatment of composite layer 2.

The composite layer 2 is one layer, which is a carbon fiber cloth layer;

Or the composite layer 2 is two layers, which are carbon fiber cloth layer and PP cotton layer respectively.

The water inlet layer 3 can be mesh cloth and/or non-woven fabric, and the water inlet layer 3 also has a filtering effect.

The reverse osmosis filter element can also be formed by rolling multiple sets of RO membrane sheets 1 .

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related All technical fields are similarly included in the scope of patent protection of the present invention.

Claims

A pretreatment-integrated roll-type RO membrane element, comprising an RO membrane (1), characterized in that: the contact surface of the RO membrane (1) in contact with raw water is provided with a composite layer (2) for preprocessing the raw water ).
The pretreatment-integrated roll-type RO membrane element according to claim 1, wherein the pretreated composite layer (2) comprises removing the raw water before the RO membrane (1) filters the raw water Free chlorine and/or decontamination and/or descaling composite layer (2).
A pretreatment integrated roll-type RO membrane element according to claim 2, characterized in that: the composite layer (2) is carbon fiber cloth and/or PP cotton and/or cloth and/or non-woven fabric and/or or carbon powder layer and/or carbon particle layer and/or ion exchange resin.
The pretreatment-integrated roll-type RO membrane element according to claim 1, 2 or 3, wherein the composite layer (2) is one layer, and the composite layer (2) faces away from the RO membrane (1). ) is provided with a water inlet layer (3) or the side of the composite layer (2) facing the RO membrane (1) is provided with a water inlet layer (3);

Or the composite layer (2) is two or more layers, and the water inlet layer (3) and/or the outermost composite layer (2) is provided between the composite layer (2) and the composite layer (2) facing the RO membrane One side of the sheet (1) is provided with a water inlet layer (3) and/or the composite layer (2) and the water inlet layer (3) are arranged crosswise.
A kind of pretreatment integrated roll type RO membrane element according to claim 4, is characterized in that:

The composite layer (2) is one layer, the water inlet layer (3) is one layer, and the pretreatment-integrated roll-type RO membrane element is composed of an RO membrane sheet (1), a composite layer (2) and a water inlet layer (3). ) are set layer by layer in turn;

Or the composite layer (2) is one layer, and the water inlet layer (3) is two layers. 2) and the water inlet layer (3) are arranged layer by layer in sequence;

Or the composite layer (2) is two layers, the water inlet layer (3) is three layers, and the pretreatment-integrated roll-type RO membrane element is sequentially composed of the RO membrane (1), the water inlet layer (3), and the composite layer. (2), the water inlet layer (3), the composite layer (2) and the water inlet layer (3) are arranged layer by layer in sequence.
A reverse osmosis filter element, characterized in that: the reverse osmosis filter element comprises a pretreatment-integrated roll-type RO membrane element according to claim 1 or 2 or 3 or 5, and the two RO membrane sheets (1) A group is formed, and a space for gathering purified water after filtration is formed between two RO membrane sheets (1) in each group;

The contact surface of one RO membrane sheet (1) in each group that contacts the raw water is provided with a composite layer (2) for pre-processing the raw water; or the contact surface of two RO membrane sheets (1) in each group that contacts the raw water Both surfaces are provided with a composite layer (2) for pretreatment of raw water.
A reverse osmosis filter element according to claim 6, characterized in that: the space communicates with the central tube cavity, and the space is provided with a water production layer (4).
A reverse osmosis filter element, characterized in that: the reverse osmosis filter element comprises a pretreatment integrated roll-type RO membrane element according to claim 4, the two RO membrane sheets (1) form a group, each group A space for collecting purified water after filtration is formed between the two RO membranes (1);

The contact surface of one RO membrane sheet (1) in each group that contacts the raw water is provided with a composite layer (2) for pre-processing the raw water; or the contact surface of two RO membrane sheets (1) in each group that contacts the raw water Both surfaces are provided with a composite layer (2) for pretreatment of raw water.
A reverse osmosis filter element according to claim 8, characterized in that: the space communicates with the central tube cavity, and the space is provided with a water production layer (4).
A reverse osmosis filter element according to claim 6 or 9, characterized in that: the composite layer (2) is one layer, which is a carbon fiber cloth layer;

Or the composite layer (2) consists of two layers, which are a carbon fiber cloth layer and a PP cotton layer respectively.