Water treatment system based on reverse osmosis membrane

Abstract

The utility model discloses a water treatment system based on a reverse osmosis membrane, which comprises a reverse osmosis device ROA which is communicated to a concentrated water collecting box through a concentrated water collecting pipe A; the reverse osmosis device ROB is communicated to the concentrated water collecting box through a concentrated water collecting pipe B; an outlet of the concentrated water collecting box is respectively communicated with a steelmaking slag braising system water tank and an ironmaking slag flushing system water tank; the concentrated water collecting pipe A is communicated with a raw water tank through a concentrated water return pipe A, and the concentrated water collecting pipe B is communicated with the raw water tank through a concentrated water return pipe B; an outlet of the raw water tank is communicated to the ultrafiltration device through the laminated filter; an outlet of the ultrafiltration device is respectively communicated with a reverse osmosis device ROA and a reverse osmosis device ROB through an ultrafiltration water producing tank; wherein each pipeline is provided with a valve for controlling the on-off of the pipeline. The problems that an existing reverse osmosis system is low in overall recovery rate, and concentrated water is difficult to completely consume are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to reverse osmosis water treatment technical field, concretely relates to a water treatment system based on reverse osmosis membrane. BACKGROUND

[0002] Reverse osmosis membrane is used enough pressure to make the solvent (general common water) in solution through reverse osmosis membrane (a kind of semi-permeable membrane) and separate out, the direction is opposite with the direction of penetration, can use the reverse osmosis method greater than the osmotic pressure and separate, purify and concentrate solution.Using reverse osmosis technology can effectively remove the dissolved salt, colloid, bacteria, virus, bacterial endotoxin and most of the impurities such as organic matter in water. The distribution of double membrane separation pore size.

[0003] The application of double membrane method (ultrafiltration+reverse osmosis) water treatment technology in water treatment industry is mainly for the purpose of desalination. The salt content in raw water and the requirement of salt content in product water are the decisive factors for selecting desalination process.

[0004] Double membrane method (ultrafiltration+reverse osmosis) water treatment process has been widely used in the preparation of desalinated water in various industries. Since the recovery rate of primary reverse osmosis is generally about 75%, 25% of reverse osmosis concentrated water is generated, and the reverse osmosis concentrated water has high salt content and is acidic. Direct reuse cannot be used in the circulating water system due to the high salt content.

[0005] Under the current severe environmental situation, the material field is completely enclosed with a greenhouse, and almost no water is sprayed, so it is difficult to consume all the concentrated water. The construction cost and operation cost of the conventional evaporation crystallization treatment concentrated water device are very high. Discharging the concentrated water from each desalination water station into the sewage treatment process increases the production cost, so how to improve the overall recovery rate of the reverse osmosis system and reduce the discharge of concentrated water is a difficult problem faced by the industry. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a water treatment system based on reverse osmosis membrane to solve the problems of low overall recovery rate of the existing reverse osmosis system and difficulty in consuming all the concentrated water.

[0007] The utility model adopts the following technical scheme: a water treatment system based on reverse osmosis membrane, including a reverse osmosis device ROA, the reverse osmosis device ROA is connected to the concentrated water collection tank through the concentrated water collection pipe A;It also includes a reverse osmosis device ROB, the reverse osmosis device ROB is connected to the concentrated water collection tank through the concentrated water collection pipe B;The outlet of the concentrated water collection tank is connected to the steel smelting slag leaching system pool and the iron smelting slag washing system pool respectively;

[0008] The concentrated water collection pipe A is connected to a raw water pool through the concentrated water backflow pipe A, and the concentrated water collection pipe B is connected to the raw water pool through the concentrated water backflow pipe B;The outlet of the raw water pool is connected to the ultrafiltration device through the laminated filter;

[0009] The outlet of the ultrafiltration device is communicated to the reverse osmosis device ROA and the reverse osmosis device ROB respectively through an ultrafiltration water tank;

[0010] Valves are arranged on each pipeline to control the opening and closing of the pipeline.

[0011] Further, the outlet of the reverse osmosis device ROA is communicated to a plant drainage channel through a concentrated water discharge pipe A, and the outlet of the reverse osmosis device ROB is communicated to the plant drainage channel through a concentrated water discharge pipe B.

[0012] Further, the outlet of the plant drainage channel is communicated to a water treatment center.

[0013] The beneficial effects of the utility model are as follows: part of the reverse osmosis concentrated water is returned to the ultrafiltration device at the front end of the reverse osmosis water inlet, the water quality of the water inlet is kept stable by dynamically adjusting the return water volume, the amount of raw water is reduced, the amount of water discharged to the water treatment center is reduced, the system recovery rate is improved, the system recovery rate can be improved by 5-10% according to the change of water quality, and the wastewater treatment cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a system structure schematic view of the utility model.

[0015] 1. the reverse osmosis device ROA, 2. the concentrated water collection pipe A, 3. the concentrated water collection tank, 4. the reverse osmosis device ROB, 5. the concentrated water collection pipe B, 6. the concentrated water return pipe A, 7. the raw water tank, 8. the concentrated water return pipe B, 9. the laminated filter, 10. the ultrafiltration device, 11. the ultrafiltration water tank, 12. the concentrated water discharge pipe A, 13. the plant drainage channel, 14. the concentrated water discharge pipe B, 15. the steel smelting stew slag system water tank, 16. the iron smelting slag flushing system water tank. DETAILED DESCRIPTION

[0016] The utility model will be explained in detail in combination with the drawings and specific embodiment.

[0017] The utility model provides a kind of water treatment system based on reverse osmosis membrane, as shown in figure Figure 1 It further includes a reverse osmosis device ROB 4, which is communicated to the concentrated water collection tank 3 through a concentrated water collection pipe B 5;The outlet of the concentrated water collection tank 3 is communicated to the steel smelting stew slag system water tank 15 and the iron smelting slag flushing system water tank 16 respectively;

[0018] The concentrated water collecting pipe A2 is communicated to a raw water pool 7 through a concentrated water backflow pipe A6, and the concentrated water collecting pipe B5 is communicated to the raw water pool 7 through a concentrated water backflow pipe B8; the outlet of the raw water pool 7 is communicated to an ultrafiltration device 10 through a laminated filter 9;

[0019] The outlet of the ultrafiltration device 10 is communicated to the reverse osmosis device ROA1 and the reverse osmosis device ROB4 respectively through an ultrafiltration water pool 11;

[0020] Valves are arranged on each pipeline to control the opening and closing of the pipeline.

[0021] In some embodiments, the outlet of the reverse osmosis device ROA1 is communicated to a plant drainage channel 13 through a concentrated water discharge pipe A12, and the outlet of the reverse osmosis device ROB4 is communicated to the plant drainage channel 13 through a concentrated water discharge pipe B14.

[0022] In some embodiments, the outlet of the plant drainage channel 13 is communicated to a water treatment center.

[0023] The utility model relates to a water treatment method for improving concentrated water recovery rate, comprising the following steps:

[0024] The volume of the concentrated water collecting box 3 is designed according to the reverse osmosis concentrated water discharge amount;

[0025] The reverse osmosis device ROA1 is communicated to the concentrated water collecting pipe A2, the concentrated water discharge pipe A12 is disconnected, and the concentrated water is collected to the concentrated water collecting box 3; the reverse osmosis device ROB4 is communicated to the concentrated water collecting pipe B5, the concentrated water discharge pipe B14 is disconnected, and the concentrated water is collected to the concentrated water collecting box 3;

[0026] The concentrated water collecting box 3 is communicated to a steelmaking slag stewing system water pool and / or an ironmaking slag flushing system water pool.

[0027] Wherein, the steelmaking slag stewing water is mainly used for reducing the temperature of the steel slag, making the steel slag powder after absorbing water, and being easy to handle in the later period. The ironmaking slag flushing refers to the process that water is used to cool the molten slag in the blast furnace to form water slag. The temperature of the concentrated water at the outlet of the reverse osmosis membrane is usually between 5 to 45 degrees Celsius, which can be used to reduce the temperature of the steel slag or cool the molten slag in the blast furnace, so that most of the concentrated water output by the reverse osmosis system is consumed.

[0028] In some embodiments, the following contents are further included:

[0029] The concentrated water collecting pipe A2 is communicated to the concentrated water backflow pipe A6 to collect the concentrated water to the raw water pool 7;

[0030] The concentrated water collecting pipe B5 is communicated to the concentrated water backflow pipe B8 to collect the concentrated water to the raw water pool 7;

[0031] The concentrated water in the raw water tank 7 is filtered by the laminated filter 9 and returned to the ultrafiltration device 10.

[0032] In some embodiments, the following are also included:

[0033] When the raw water tank 7 or the concentrated water collecting tank 3 cannot collect concentrated water, the reverse osmosis device ROA1 is communicated with the concentrated water discharge pipe A12 to guide the concentrated water to the plant drainage channel 13; the reverse osmosis device ROB4 is communicated with the concentrated water collecting pipe B5 to guide the concentrated water to the plant drainage channel 13.

[0034] Through field tests, by digesting the concentrated water in three ways, i.e. steelmaking slag stewing, ironmaking slag flushing and returning to the raw water tank for recycling, the following effects are achieved:

[0035] Part of the reverse osmosis concentrated water is returned to the ultrafiltration device at the front end of the reverse osmosis inlet water, the return water quantity is dynamically adjusted to keep the inlet water quality stable, the raw water quantity and the quantity of water discharged into the water treatment center are reduced, the system recovery rate is improved, according to the change of water quality, the system recovery rate can be improved by 5-10%, and the wastewater treatment cost is reduced. At the same time, the reverse osmosis concentrated water is used as water for steelmaking slag stewing and ironmaking slag flushing, the workload of treating concentrated water by the water treatment center is reduced, the concentrated water can be directly delivered to the water tank for steelmaking slag stewing and ironmaking slag flushing, and the treatment cost of the concentrated water is reduced.

Claims

1. A water treatment system based on a reverse osmosis membrane, characterized in that, The system includes a reverse osmosis unit ROA (1), which is connected to a concentrate collection tank (3) via a concentrate collection pipe A (2); it also includes a reverse osmosis unit ROB (4), which is connected to a concentrate collection tank (3) via a concentrate collection pipe B (5); the outlet of the concentrate collection tank (3) is connected to a steelmaking slag slagging system pool (15) and an ironmaking slag flushing system pool (16), respectively. The concentrated water collection pipe A (2) is connected to a raw water tank (7) via the concentrated water return pipe A (6), and the concentrated water collection pipe B (5) is connected to the raw water tank (7) via the concentrated water return pipe B (8); the outlet of the raw water tank (7) is connected to the ultrafiltration device (10) via the disc filter (9); The outlet of the ultrafiltration device (10) is connected to the reverse osmosis device ROA (1) and the reverse osmosis device ROB (4) via the ultrafiltration product water tank (11). Each pipeline is equipped with a valve to control the opening and closing of the pipeline.

2. The water treatment system based on a reverse osmosis membrane as described in claim 1, characterized in that, The outlet of the reverse osmosis unit ROA (1) is connected to the plant drainage ditch (13) through the concentrate discharge pipe A (12), and the outlet of the reverse osmosis unit ROB (4) is connected to the plant drainage ditch (13) through the concentrate discharge pipe B (14).

3. A water treatment system based on a reverse osmosis membrane as described in claim 2, characterized in that, The outlet of the plant drainage ditch (13) is connected to the water treatment center.

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