Anti-blocking reverse osmosis water treatment device

Abstract

The utility model relates to an anti-blocking reverse osmosis water treatment device and belongs to the field of water treatment. Comprising a high-pressure pump, a reverse osmosis first-section membrane, an inter-section pump, a reverse osmosis second-section membrane and a two-way flushing device, according to the utility model, the chemical cleaning frequency in summer and autumn is prolonged to nearly 40 days from the original 15-20 days once, so that the problem of pollution and blockage of the membrane is greatly improved. After modification, the service life of the reverse osmosis membrane can be prolonged by at least one third of about 8 months, the consumption of the membrane is reduced, and the water production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of anti-blocking reverse osmosis water treatment devices, belong to water treatment field. BACKGROUND

[0002] The main process of wastewater reuse device is pretreatment, ultrafiltration, reverse osmosis and concentrated water catalytic oxidation. Among them, the reverse osmosis system is the main core process, and the water produced is the final water for reuse. Reverse osmosis is also the system with the most routine maintenance. Since the water source of the reuse device comes from sewage such as sea water discharge and circulating water sewage, the water contains trace amounts of microorganisms, slime, and flocculants such as PAC and PAM. These substances can easily cause reverse osmosis membrane fouling, resulting in frequent chemical cleaning of reverse osmosis, reducing the service life of the membrane, reducing the output of the device, and increasing the consumption of cleaning chemicals and manual labor.

[0003] Reverse osmosis membranes need to be chemically cleaned every half month or so, which seriously affects production, and frequent cleaning also rapidly reduces the desalination efficiency of reverse osmosis membranes. Reverse osmosis fouling mainly occurs at the front end of the first stage, i.e. the water inlet end. The main way to solve fouling is to strengthen pretreatment, but this often does not have a significant effect, especially in summer when the temperature is high, microorganisms reproduce quickly, and there are many colloidal substances, making fouling particularly severe, resulting in a series of problems such as reduced reverse osmosis production, increased energy consumption, reduced service life, and increased sewage discharge during cleaning. SUMMARY

[0004] According to the problems described in the background, the utility model solves the following problems:

[0005] Reverse osmosis membranes are prone to fouling and require frequent chemical cleaning, which reduces the service life of the membranes.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A reverse osmosis water treatment device is provided, which includes a high-pressure pump, a reverse osmosis first-stage membrane, an inter-stage pump, a reverse osmosis second-stage membrane, and a bidirectional flushing device. The sewage is sent to the water inlet end of the reverse osmosis first-stage membrane by the high-pressure pump, and after passing through the reverse osmosis first-stage membrane, the water outlet end of the reverse osmosis first-stage membrane is connected to the inter-stage pump through a concentrated water pipeline. The water outlet end of the reverse osmosis first-stage membrane is connected to the water production main pipe through a first-stage water production pipeline. The inter-stage pump is connected to the water inlet end of the reverse osmosis second-stage membrane, and the water outlet end of the reverse osmosis second-stage membrane is provided with a concentrated water discharge line and a second-stage water production pipeline. The second-stage water production pipeline is connected to the water production main pipe. The bidirectional flushing device includes a forward flushing pipeline, a reverse flushing pipeline, and a sewage discharge pipeline. The forward flushing pipeline is connected to the water inlet end of the reverse osmosis first-stage membrane, the reverse flushing pipeline is connected to the concentrated water pipeline, and the sewage discharge pipeline is connected to the water inlet end of the reverse osmosis first-stage membrane and the water outlet end of the reverse osmosis first-stage membrane.

[0008] Preferably, the bidirectional flushing device uses the water produced by the device as flushing water.

[0009] Preferably, the forward flushing pipeline and the reverse flushing pipeline are each provided with an electric valve, the blowdown pipeline is provided with an electric valve at the connection between the reverse osmosis first-stage membrane water inlet end and the reverse osmosis first-stage membrane water outlet end, and the electric valves are adjusted by a DCS control system.

[0010] During long-time operation or shutdown of the reverse osmosis device, low-pressure flushing needs to be performed periodically using product water, mainly for preventing concentration polarization of the concentrated water on the membrane surface, thereby causing fouling of the membrane surface, and flushing away part of the residues on the membrane surface with high-quality water. The fouling mainly concentrates on the front end of the reverse osmosis first-stage membrane and is often viscous, and is difficult to flush away. Since the forward flushing is from front to back, even if the fouling is flushed away, the fouling will enter the next membrane, causing the fouling to penetrate deeper and deeper. If the reverse flushing is increased, the fouling will be directly flushed out of the system from the first-stage membrane, without fouling the membrane elements in the rear stage.

[0011] The reverse flushing connects the flushing water to the concentrated water pipeline, and simultaneously connects the blowdown pipeline from the reverse osmosis first-stage membrane water inlet end. The blowdown pipeline is provided with a corresponding electric valve, the control system is connected to the indoor DCS control system, and the program control operation program is modified. When the forward flushing water is completed, the reverse flushing is immediately performed, the water flows from the rear end to the front end, and is then flushed out by the water inlet pipe.

[0012] The beneficial effects of the utility model are as follows:

[0013] The chemical cleaning frequency of the utility model in summer and autumn is prolonged from the original 15-20 days once to nearly 40 days, thereby greatly improving the fouling problem of the membrane. After the transformation, the service life of the reverse osmosis membrane is estimated to be prolonged by at least one-third, i.e., about 8 months, the consumption of the membrane is reduced, and the water production cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram

[0015] In the drawing, 1 is a high-pressure pump, 2 is a reverse osmosis first-stage membrane, 21 is a reverse osmosis first-stage membrane water inlet end, 22 is a reverse osmosis first-stage membrane water outlet end, 23 is a first-stage water production pipeline, 3 is an inter-stage pump, 4 is a reverse osmosis second-stage membrane, 41 is a reverse osmosis second-stage membrane water inlet end, 42 is a reverse osmosis second-stage membrane water outlet end, 43 is a concentrated water external discharge pipeline, 44 is a second-stage water production pipeline, 5 is a concentrated water pipeline, 6 is a total water production pipeline, 71 is a forward flushing pipeline, 72 is a reverse flushing pipeline, 73 is a blowdown pipeline, and 8 is an electric valve. DETAILED DESCRIPTION

[0016] Example 1

[0017] The application discloses an anti-blocking reverse osmosis water treatment device which comprises a high-pressure pump 1, a reverse osmosis first-stage membrane 2, an inter-stage pump 3, a reverse osmosis second-stage membrane 4 and a bidirectional flushing device; sewage is sent to a water inlet end 21 of the reverse osmosis first-stage membrane by the high-pressure pump 1, and after passing through the reverse osmosis first-stage membrane 2, the sewage is connected with the inter-stage pump 3 through a concentrated water pipeline 5, a water outlet end 22 of the reverse osmosis first-stage membrane is connected with a water production main pipeline 6 through a first-stage water production pipeline 23; the inter-stage pump 3 is connected with a water inlet end 41 of the reverse osmosis second-stage membrane, a water outlet end 42 of the reverse osmosis second-stage membrane is provided with a concentrated water discharge pipeline 43 and a second-stage water production pipeline 44, and the second-stage water production pipeline 44 is connected with the water production main pipeline 6; the bidirectional flushing device comprises a forward flushing pipeline 71, a reverse flushing pipeline 72 and a blowdown pipeline 73, the forward flushing pipeline 71 is connected with the water inlet end 21 of the reverse osmosis first-stage membrane, the reverse flushing pipeline 72 is connected with the concentrated water pipeline 5, and the blowdown pipeline 73 is connected with the water inlet end 21 of the reverse osmosis first-stage membrane and the water outlet end 22 of the reverse osmosis first-stage membrane.

[0018] The bidirectional flushing device uses water produced by the device as flushing water.

[0019] The forward flushing pipeline 71 and the reverse flushing pipeline 72 are both provided with electric valves 8, the blowdown pipeline 73 is provided with electric valves 73 at positions connected with the water inlet end 21 of the reverse osmosis first-stage membrane and the water outlet end 22 of the reverse osmosis first-stage membrane, and the electric valves 73 are adjusted through a DCS control system.

[0020] The chemical cleaning frequency of the device in summer and autumn is prolonged from 15-20 days once to nearly 40 days, the membrane blocking problem is greatly improved, the service life of the reverse osmosis membrane is prolonged by at least one third, i.e. 8 months, the consumption of the membrane is reduced, and the water production cost is reduced.

Claims

1. A clog-resistant reverse osmosis water treatment device, comprising a high-pressure pump (1), a first-stage reverse osmosis membrane (2), an inter-stage pump (3), and a second-stage reverse osmosis membrane (4), characterized in that, It also includes a two-way flushing device; wastewater is sent by a high-pressure pump (1) to the inlet (21) of the first stage reverse osmosis membrane, and after passing through the first stage reverse osmosis membrane (2), it is connected to the inter-stage pump (3) through the concentrate pipeline (5) from the outlet (22) of the first stage reverse osmosis membrane. The outlet (22) of the first stage reverse osmosis membrane is connected to the main permeate pipe (6) through the permeate pipeline (23). The inter-stage pump (3) is connected to the inlet (41) of the second stage reverse osmosis membrane, and the outlet (42) of the second stage reverse osmosis membrane is equipped with a concentrate drain line (43). The device includes a two-stage permeate pipeline (44), which is connected to the permeate main pipe (6); the bidirectional flushing device includes a forward flushing pipeline (71), a reverse flushing pipeline (72), and a wastewater discharge pipeline (73). The forward flushing pipeline (71) is connected to the inlet end (21) of the first stage reverse osmosis membrane, the reverse flushing pipeline (72) is connected to the concentrate pipeline (5), and the wastewater discharge pipeline (73) is connected to the inlet end (21) of the first stage reverse osmosis membrane and the outlet end (22) of the first stage reverse osmosis membrane.

2. The anti-clogging reverse osmosis water treatment device according to claim 1, characterized in that, The bidirectional flushing device uses the water produced by the device itself as flushing water.

3. The anti-clogging reverse osmosis water treatment device according to claim 1, characterized in that, Both the forward flushing line (71) and the reverse flushing line (72) are equipped with electric valves (8). The sewage discharge line (73) is equipped with electric valves (8) at the connection between the inlet (21) and outlet (22) of the first stage reverse osmosis membrane. The electric valves (8) are regulated by the DCS control system.

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