CN216336744U

CN216336744U - CFRO reverse-flow reverse osmosis device for high-concentration of high-salinity wastewater

Info

Publication number: CN216336744U
Application number: CN202122519083.3U
Authority: CN
Inventors: 周强; 于涛; 朱勤勇; 董林吟雪
Original assignee: Gorun Shanghai Environmental Protection Technology Co ltd
Current assignee: Gorun Shanghai Environmental Protection Technology Co ltd
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-04-19
Anticipated expiration: 2031-10-19

Abstract

The utility model discloses a CFRO reverse osmosis device for high-concentration of high-salinity wastewater, which comprises a plurality of reverse osmosis devices, wherein a plurality of reverse osmosis devices are connected in the scheme, the high-salinity wastewater enters a first reverse osmosis device for concentration, concentrated water after the concentration of the first reverse osmosis device flows into a second reverse osmosis device for further concentration, the concentrated water after the concentration of the second reverse osmosis device enters a third reverse osmosis device for further concentration, meanwhile, purified water in the first reverse osmosis device is discharged, salt-containing purified water II, purified water III and high-salinity wastewater in the second reverse osmosis device and the third reverse osmosis device are mixed and flow into the first reverse osmosis device to reduce the salt-containing concentration of the high-salinity wastewater, reduce the osmotic pressure difference at two sides of the reverse osmosis membrane, reduce the damage to the membrane and synchronously prolong the service life of the membrane, meanwhile, the purified water is concentrated again, and the system can greatly concentrate the salt content at normal temperature and under medium pressure, so that the cost is low, and the system is suitable for popularization.

Description

CFRO reverse-flow reverse osmosis device for high-concentration of high-salinity wastewater

Technical Field

The utility model relates to the technical field of high-salinity water concentration devices, in particular to a CFRO (reverse osmosis) device for high-salinity wastewater high-power concentration.

Background

High salt-containing wastewater refers to wastewater with a total salt content (calculated as sodium chloride) of more than 3.5%, which contains a large amount of ions and some organic matters difficult to degrade. The waste water is directly discharged without treatment, so that on one hand, the pollution of soil or water can be caused; on the other hand, salts such as sodium chloride are often raw materials for industrial production, and waste of resources is also caused. Therefore, the problem of how to properly treat the high-salinity wastewater under the premise of effectively recovering the salinity is inevitable in the industrial production process gradually becomes.

The high-salinity wastewater high-power concentration technology on the market at present comprises the following steps:

1. the membrane treatment technology comprises the following steps: high pressure reverse osmosis (STRO, DTRO, HPRO) requires the use of higher operating pressures (100bar) to concentrate the wastewater. However, the osmotic pressure of the high-salinity wastewater is high, the application of the reverse osmosis membrane technology needs to overcome the influence of the osmotic pressure to concentrate, and the salt content can only be concentrated to about 8-10% so that the concentration is difficult to continue, thereby bringing great challenges to the system safety.

2. Electrochemical technology: the ED technology and the electrochemical technology are used for treating the salt-containing wastewater, so that not only can organic pollutants in the wastewater be removed, but also the salt in the wastewater can be removed. The salinity can be concentrated to about 20-25% under normal pressure, but the salinity is generally treated by combining with an RO system. The method has the disadvantages of high cost, extremely high treatment and maintenance cost and difficult industrial popularization.

3. Evaporation technology: the solvent and the solute with lower boiling point are vaporized by heating, most of the solute is reserved in the evaporation container to be concentrated in the process, and the volume of the waste water after evaporation can be reduced remarkably, so that near zero emission of the waste water is realized. The heating evaporation technology which is widely applied at present comprises a multi-stage flash evaporation technology, a low-temperature multi-effect distillation technology, a vacuum low-temperature evaporation and Mechanical Vapor Recompression (MVR) technology. Evaporation and concentration, which needs high salinity water source, the required metal material is extremely high, the manufacturing cost is high and the heat source is consumed. Although the evaporator has a remarkable effect on removing the solute, the power consumption per ton of water and the equipment cost are higher than those of other methods.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one technical defect, the utility model provides the following technical scheme:

the application document discloses a CFRO reverse osmosis unit against current for high salt waste water high-power is concentrated, including a plurality of reverse osmosis unit, wherein a dense water delivery port of reverse osmosis unit one with the water inlet of reverse osmosis unit two is connected, two delivery ports of dense water of reverse osmosis unit two with the water inlet of reverse osmosis unit three is connected, just the delivery port of purified water in two of reverse osmosis unit, the reverse osmosis unit three all with the water inlet of reverse osmosis unit one is connected.

A plurality of reverse osmosis unit use even in this scheme, high salt waste water gets into reverse osmosis unit one and concentrates, the concentrated water of reverse osmosis unit one concentrated back flows into reverse osmosis unit two and further concentrates, the concentrated water of reverse osmosis unit two concentrated back gets into reverse osmosis unit three and further concentrates, the while is purified water and discharges in reverse osmosis unit one, reverse osmosis unit two, the salt-containing purified water two of reverse osmosis unit three, the mixture of purified water three and high salt waste water flows into reverse osmosis unit one in order to reduce high salt waste water and contain salt concentration, reduce the osmotic pressure difference of reverse osmosis membrane both sides, reduce the life to the damage of membrane extension membrane in step, purify water simultaneously once more and concentrate, and this system can concentrate salt content by a wide margin under normal atmospheric temperature middling pressure, and is low in cost, and the adaptation is promoted.

And the water outlet of the concentrated water III of the reverse osmosis device III is connected with the water inlet of the reverse osmosis device IV, the water outlet of the purified water IV of the reverse osmosis device IV is connected with the water inlet of the reverse osmosis device III, and the salt content of the concentrated water can be further concentrated by increasing the connection of the reverse osmosis device IV and the reverse osmosis device.

Furthermore, the water inlet of the third reverse osmosis device is provided with a first pump, the water inlet of the first pump is connected with the water outlet of the fourth purified water in the fourth reverse osmosis device, the pipe body at the water outlet of the first pump is communicated with the water outlet of the second concentrated water in the second reverse osmosis device, and the pump is installed to conveniently pump the purified water into the corresponding reverse osmosis device.

Furthermore, the water inlet of the first reverse osmosis device is provided with a second pump, the water inlet of the second pump is communicated with the water outlets of the second purified water and the third purified water in the second reverse osmosis device and the third reverse osmosis device, and the pump is installed to conveniently pump the purified water into the corresponding reverse osmosis device.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the utility model, multiple reverse osmosis devices are connected, the high-concentration brine in the upper reverse osmosis device is diluted by the brine purified water in the lower reverse osmosis device, so that the pressure difference between two sides of the osmosis membrane is reduced, the damage to the membrane is reduced, and the purified water is concentrated again.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic flow diagram of the CFRO reverse osmosis system for high-salinity wastewater high-power concentration of example 1;

wherein the reference numerals are:

1. a first reverse osmosis device; 2. a reverse osmosis device II; 3. a third reverse osmosis device; 4. a reverse osmosis device IV; 5. a first pump; 6. a second pump; BO: high salt waste water; b1: 1, concentrated water I; b2: a second concentrated water; b3: concentrated water III; b4: fourthly, concentrated water; p1: purifying water I; p2: purifying water II; p3: purifying water III; p4: and purifying the water.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

Example 1

As shown in fig. 1, the CFRO reverse flow reverse osmosis system for high-concentration of high-salinity wastewater comprises a plurality of reverse osmosis devices, namely a first reverse osmosis device 1, a second reverse osmosis device 2, a third reverse osmosis device 3 and a fourth reverse osmosis device 4. As shown in fig. 1, a water outlet of the first concentrated water B1 of the first reverse osmosis device 1 is connected with a water inlet of the second reverse osmosis device 2 through a pipeline, a water outlet of the second concentrated water B2 of the second reverse osmosis device 2 is connected with a water inlet of the third reverse osmosis device 3 through a pipeline, and water outlets of the second purified water P2 and the third purified water P3 of the second reverse osmosis device 2 and the third reverse osmosis device 3 are connected with a water inlet of the first reverse osmosis device 1 through pipelines; the water outlet of the concentrated water III B3 in the reverse osmosis device III 3 is connected with the water inlet of the reverse osmosis device IV 4 through a pipeline, and the water outlet of the purified water IV P4 in the reverse osmosis device IV 4 is connected with the water inlet of the reverse osmosis device III 3 through a pipeline.

In the embodiment, the first, second, third and fourth reverse osmosis devices are of common models in the market, the water inlet of the first reverse osmosis device 1 is communicated with the water outlet of the second pump 6, the water inlet pipeline of the second pump 6 is communicated with the water outlets of the second reverse osmosis device 2, the second purified water P2 and the third purified water P3 in the third reverse osmosis device 3, and the second pump 6 is used for conveying high-salinity wastewater, purified water and the like to the first reverse osmosis device 1. The water inlet of the reverse osmosis device III 3 is communicated with the water outlet of the pump I5, and the water inlet pipeline of the pump I5 is communicated with the water outlet pipeline of the purified water IV P4 in the reverse osmosis device IV 4.

In one application example, the high-salinity wastewater B0 containing 6.3% of salt and having the concentration of 65000mg/L is treated by the device and is input into the reverse osmosis device I1 at the flow rate of 1009m3/hr, the purified water I P1 is output at the flow rate of 627.0m3/hr and the indicator containing 0.0% of salt, and the concentrated water I B1 is output to the reverse osmosis device II 2 at the flow rate of 876.09m3/hr and the indicator containing 9.6% of salt and having the concentration of 102000 mg/L.

After the concentrated water is treated by the second reverse osmosis device 2, purified water II P2 of the concentrated water II is mixed with the original high-salinity wastewater under the action of a second pump 6 and is input into the first reverse osmosis device 1 according to the indexes of 275.0m3/hr, 4.2% of salt and 43309mg/L of concentration, and concentrated water II B2 in the second reverse osmosis device 2 is discharged into a third reverse osmosis device 3 according to the indexes of 601.7m3/hr, 11.9% of salt and 129153mg/L of concentration.

After the second concentrated water is treated by the third reverse osmosis device 3, the purified water third P3 is mixed with the purified water second P2 of the second reverse osmosis device 2 and the original high-salinity wastewater at the ratio of 216.8m3/hr and the salt content of 5.4 percent and the concentration of 56354mg/L and flows into the first reverse osmosis device 1, and the concentrated water third B3 is discharged into the fourth reverse osmosis device 4 at the ratio of 843.6m3/hr and the salt content of 12.6 percent and the concentration of 137224 mg/L.

After the concentrated water III B3 is treated in the reverse osmosis device IV 4, purified water IV P4 flows into the reverse osmosis device IV 4 after being mixed with concentrated water III of the reverse osmosis device III 3 according to the indexes of 458.3m3/hr, salt content is 10.2 percent and concentration is 109676mg/L, and concentrated water IV B4 is discharged according to the indexes of 385.55m3/hr, salt content is 15.3 percent and concentration is 1699.9 mg/L.

The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the utility model may occur to those skilled in the art without departing from the principle of the utility model, and are considered to be within the scope of the utility model.

Claims

1. A CFRO reverse-flow reverse osmosis device for high-concentration of high-salinity wastewater comprises a plurality of reverse osmosis devices and is characterized in that a first concentrated water outlet of a first reverse osmosis device is connected with a second water inlet of a second reverse osmosis device, a second concentrated water outlet of the second reverse osmosis device is connected with a third water inlet of the reverse osmosis device, and water outlets of a second purified water outlet of the second reverse osmosis device and a third purified water outlet of the third reverse osmosis device are connected with the first water inlet of the reverse osmosis device; the water purifier further comprises a fourth reverse osmosis device, wherein a third concentrated water outlet of the third reverse osmosis device is connected with a water inlet of the fourth reverse osmosis device, and a water outlet of the fourth purified water outlet of the fourth reverse osmosis device is connected with a water inlet of the third reverse osmosis device.

2. The CFRO reverse flow reverse osmosis apparatus for high-concentration of high-salinity wastewater according to claim 1, wherein: and a first pump is arranged at the water inlet of the third reverse osmosis device, the water inlet of the first pump is connected with the water outlet of the fourth purified water in the fourth reverse osmosis device, and the pipe body at the water outlet of the first pump is communicated with the water outlet of the second concentrated water in the second reverse osmosis device.

3. The CFRO reverse flow reverse osmosis apparatus for high-concentration of high-salinity wastewater according to claim 1, wherein: and a water inlet of the first reverse osmosis device is provided with a second pump, and a water inlet of the second pump is communicated with water outlets of the second reverse osmosis device and the third reverse osmosis device for purified water and purified water.