CN202671263U - Water treatment system with secondary reverse osmosis concentrated water branch reflux - Google Patents

Abstract

The utility model discloses a water treatment system with two-stage reverse osmosis concentrated water circuit backflow, which comprises a raw water tank, a primary reverse osmosis component and a secondary reverse osmosis component. A high-pressure pump is arranged between the water inlets of the osmosis components, and the concentrated water outlet of the secondary reverse osmosis component has two branches, one branch is connected with the raw water tank, and the other is connected with the water inlet of the high-pressure pump. The utility model sets two different branches for the concentrated water of the secondary reverse osmosis, so that part of the concentrated water of the secondary reverse osmosis flows back to the water inlet of the high-pressure pump, which can increase the surface flow velocity of the secondary reverse osmosis membrane and improve the quality of the effluent. Save a lot of alkali addition costs; another part of the secondary reverse osmosis concentrated water returns to the raw water tank, and this part of the backflow can reduce the salt content of the raw water after mixing, avoiding the impact on the system due to the increase of the PH value, reducing the maintenance cost and improving the efficiency of production.

Description

A water treatment system with two-stage reverse osmosis concentrated water return flow

technical field

The utility model relates to the technical field of water treatment equipment, in particular to a water treatment system with two-stage reverse osmosis concentrated water circuit backflow.

Background technique

In the known field of water treatment technology, the first-stage reverse osmosis product water needs to enter the second-stage reverse osmosis system. Since the conductivity of the first-stage reverse osmosis product water is already very low, and the recovery rate of the second-stage reverse osmosis is generally relatively high, so The conductivity meter of the concentrated water of the secondary reverse osmosis is generally much lower than that of the raw water. The traditional process is to return all the concentrated water of the secondary reverse osmosis to the raw water tank when reusing the concentrated water of the secondary reverse osmosis, so as to avoid The discharge of the secondary reverse osmosis concentrated water is wasteful, but due to the high pH value of the concentrated water, generally reaching 9-10, the reuse of this water will affect the pH value of the raw water, affecting the effect of reverse osmosis treatment, and in the actual use process It is easy to cause fouling of the first-stage reverse osmosis membrane and damage the membrane elements. At the same time, it also brings some difficulties to maintenance and increases production costs.

Utility model content

The technical problem to be solved by the utility model is to provide a water treatment system that can make full use of the secondary reverse osmosis concentrated water without damaging the membrane elements.

The technical solution adopted by the utility model to solve the technical problem is: a water treatment system with two-stage reverse osmosis concentrated water circuit backflow, including a raw water tank, a primary reverse osmosis component and a secondary reverse osmosis component. A high-pressure pump is provided between the water outlet of the primary reverse osmosis component and the water inlet of the secondary reverse osmosis component. The concentrated water outlet of the secondary reverse osmosis component has two shunts, one of which is connected to the raw water tank, The other is connected to the water inlet of the high pressure pump.

Further, in order to conveniently adjust the flow rate of the secondary reverse osmosis concentrated water to the raw water tank, the utility model is provided with a return valve on the branch road where the concentrated water outlet of the secondary reverse osmosis component is connected to the raw water tank.

Further, in order to conveniently adjust the flow rate of the secondary reverse osmosis concentrated water pointing to the water inlet of the high-pressure pump, the utility model is provided with a return valve on the branch road where the concentrated water outlet of the secondary reverse osmosis component is connected to the water inlet of the high-pressure pump .

The beneficial effects of the utility model are: the utility model sets two different branches for the secondary reverse osmosis concentrated water, so that a part of the secondary reverse osmosis concentrated water flows back to the water inlet of the high-pressure pump, which can improve the surface of the secondary reverse osmosis membrane. The flow rate can reduce the concentration polarization and improve the effluent water quality. In addition, the PH value of the secondary reverse osmosis concentrated water is relatively high, generally reaching 9-10, while the PH value of the primary reverse osmosis effluent is low due to the inability to remove carbon dioxide gas. 6-6.5, so this part of the concentrated water backflow can save or even omit the alkali addition of the secondary reverse osmosis feed water, thereby saving a lot of alkali addition costs; another part of the secondary reverse osmosis concentrated water is returned to the original water tank, and this part of the return flow is mixed Finally, the salt content of the raw water can be reduced. At the same time, due to the reduction of the concentrated water backflow, the impact of the concentrated water with a high pH value on the pH value of the raw water is greatly reduced, and the impact on the system due to the increase in the pH value can be avoided, such as membrane fouling and blockage. The cost of maintenance is reduced and the efficiency of production is improved.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is a structural representation of the utility model.

In the figure: 1. Raw water tank, 2. Primary reverse osmosis component, 3. Secondary reverse osmosis component, 4. High pressure pump.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is described in further detail. These drawings are all simplified schematic diagrams, and only schematically illustrate the basic structure of the utility model, so they only show the configurations related to the utility model.

As shown in Figure 1, a water treatment system of the present utility model with two-stage reverse osmosis concentrated water circuit backflow includes a raw water tank 1, a primary reverse osmosis assembly 2 and a secondary reverse osmosis assembly 3. A high-pressure pump 4 is arranged between the water outlet of the reverse osmosis component 2 and the water inlet of the secondary reverse osmosis component 3. The concentrated water outlet of the secondary reverse osmosis component 3 has two shunts, one of which is connected to the raw water tank 1 is connected, and the other is connected with the water inlet of the high-pressure pump 4; at the same time, a return valve is provided on the branch where the concentrated water outlet of the secondary reverse osmosis component 3 is connected with the raw water tank 1, and the secondary reverse osmosis component 3 A reflux valve is also provided on the branch where the concentrated water outlet of the high pressure pump 4 is connected to the water inlet.

Inspired by the above ideal embodiment according to the utility model, through the above description content, relevant staff can completely make various changes and modifications within the scope of not deviating from the technical idea of the utility model. The technical scope of this utility model is not limited to the content in the description, but must be determined according to the scope of the claims.

Claims (3)

1. one kind has the water treatment system that refluxes in the dense moisture of two-pass reverse osmosis road, comprise raw water box (1), first-stage reverse osmosis assembly (2) and two-pass reverse osmosis assembly (3), between the water-in of the water outlet of described first-stage reverse osmosis assembly (2) and two-pass reverse osmosis assembly (3), be provided with high-pressure pump (4), it is characterized in that: the dense water out of described two-pass reverse osmosis assembly (3) has two shunt, article one, shunt links to each other with raw water box (1), and another water-in with high-pressure pump (4) links to each other.

2. a kind of water treatment system that refluxes in the dense moisture of two-pass reverse osmosis road that has as claimed in claim 1, it is characterized in that: the dense water out of described two-pass reverse osmosis assembly (3) is provided with reverse flow valve with the shunt that raw water box (1) links to each other.

3. a kind of water treatment system that refluxes in the dense moisture of two-pass reverse osmosis road that has as claimed in claim 1, it is characterized in that: the dense water out of described two-pass reverse osmosis assembly (3) is provided with reverse flow valve with the shunt that the water-in of high-pressure pump (4) links to each other.

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