CN212076622U - Reverse osmosis device for concentrating low molecular weight alcohol solution - Google Patents
Reverse osmosis device for concentrating low molecular weight alcohol solution Download PDFInfo
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- CN212076622U CN212076622U CN202020603078.3U CN202020603078U CN212076622U CN 212076622 U CN212076622 U CN 212076622U CN 202020603078 U CN202020603078 U CN 202020603078U CN 212076622 U CN212076622 U CN 212076622U
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Abstract
The application relates to the field of environmental protection, in particular to a reverse osmosis device for concentrating a solution containing low molecular weight alcohol, which comprises a first-stage reverse osmosis concentration unit and two sections of two-stage continuous reverse osmosis treatment units, wherein an internal circulation process is adopted; the first-stage reverse osmosis concentration unit is communicated with the two sections of two-stage continuous reverse osmosis treatment units. The reverse osmosis treatment method solves the problem of reverse osmosis treatment of substances with lower rejection rate through adjustment and optimization of a process route, and achieves the purpose of standard discharge of treated effluent on the basis of improving the recovery rate and reducing the operation energy consumption. The utility model discloses a two sections continuous reverse osmosis equipment carry out the series connection technology, have realized the concentration of low molecular weight alcohol class solution and the recovery of alcohols material, and the rate of recovery is more than or equal to 99%, and the chemical oxygen demand of final aquatic after the processing reaches the earth's surface and discharges the requirement.
Description
Technical Field
The application relates to the field of environmental protection, in particular to a reverse osmosis device and a method for concentrating a solution containing low molecular weight alcohol.
Background
After the airplane is deiced, a large amount of low molecular weight alcohol-containing wastewater is generated, and the wastewater has high chemical oxygen consumption and is easy to permeate in soil to pollute underground water. At present, the airplane deicing wastewater is treated by mainly adopting an evaporation concentration recovery method so as to realize the recovery of alcohol substances and reduce the consumption of low molecular weight alcohol as a raw material. However, the low-concentration alcohol-containing solution generated in the evaporation concentration process of the wastewater has high chemical oxygen consumption (2000-10000 mg/L), and cannot meet the discharge requirement.
Reverse osmosis is a membrane separation technique that uses pressure difference as driving force to separate solvent from solution, and is commonly used for seawater desalination, treatment of electroplating wastewater and landfill leachate, and purification and concentration of chemical industry products. However, the recovery rate of the traditional reverse osmosis process is low (generally 75%), and the energy consumption for equipment operation becomes high.
Patent CN102249434B discloses a treatment process with ultrahigh recovery rate and concentrated water high-temperature reverse osmosis treatment equipment thereof. After the wastewater is respectively treated by a raw water reverse osmosis process, a concentrated water reverse osmosis process and a high-temperature reverse osmosis process, the weight of the finally separated concentrated water is reduced to 2-5% of the total weight of the wastewater. Although the process and the equipment can obtain more than 95 percent of purified water, the purified water COD generated by the process and the equipment can not meet the discharge requirement for the low molecular weight alcohol solution with lower retention rate.
Patent CN109092065A discloses a device and method for removing low molecular weight alcohols by a large-circulation reverse osmosis process. The device comprises a single-stage concentration section and at least three multi-stage reverse osmosis units connected in series in sequence, and is used for concentrating low molecular weight alcohols in an aqueous solution, and the alcohol concentration content in a treated permeate liquid is lower than 30 ppm. Although the solution treated by the device can meet the discharge requirement, the process adopts a large-flow circulation process, and a large amount of solution circulates among equipment in the operation process of the device, so that the treatment efficiency of the device is reduced, and the operation energy consumption is higher.
Because the rejection rate of the reverse osmosis membrane to low molecular weight alcohol substances is lower, the traditional reverse osmosis treatment process can not realize the purposes of realizing the standard discharge of treated effluent and reducing the operation energy consumption on the basis of improving the recovery rate.
Disclosure of Invention
For solving the above-mentioned problem that current technology exists, solve the contradiction that the treatment in-process goes out water discharge to reach standard and high rate of recovery, the utility model discloses now provide a concentration and contain reverse osmosis process and device of low molecular weight alcohol class solution, when reducing the operation energy consumption of device, not only can make the rate of recovery of low molecular weight alcohol class be more than or equal to 99%, can adjust according to the low molecular weight alcohol concentration of intaking simultaneously, make the Chemical Oxygen Demand (COD) of handling the aquatic reach the surface water and discharge the requirement (CDD is less than or equal to 40 mg/L).
In order to solve the technical purpose, the utility model adopts the following technical scheme:
a reverse osmosis apparatus for concentrating a solution containing a low molecular weight alcohol, characterized by: comprises a first-stage reverse osmosis concentration unit adopting an internal circulation process and two-stage continuous reverse osmosis treatment units; the first-stage reverse osmosis concentration unit is communicated with the two sections of two-stage continuous reverse osmosis treatment units.
The first-stage two-stage continuous reverse osmosis treatment unit comprises a low molecular weight alcohol solution feeding tank, a first two-stage continuous reverse osmosis treatment device and a first reverse osmosis water outlet tank which are sequentially connected in series, wherein the low molecular weight alcohol solution feeding tank is connected with a first two-stage continuous reverse osmosis treatment device feeding pump and a first two-stage continuous reverse osmosis treatment device high-pressure pump of the first two-stage continuous reverse osmosis treatment device through pipelines, a concentrated liquid outlet of the first two-stage continuous reverse osmosis treatment device is connected with a concentrated liquid circulating tank of the first reverse osmosis concentration unit through a pipeline, and a dialyzate outlet of the first two-stage continuous reverse osmosis treatment device is connected with the first reverse osmosis water outlet tank.
Each two-stage continuous reverse osmosis treatment unit comprises an intersegment high-pressure pump, a two-stage membrane treatment unit and an intermediate buffer tank.
The second-stage two-stage continuous reverse osmosis treatment unit comprises a second two-stage continuous reverse osmosis treatment equipment feed pump, a second two-stage continuous reverse osmosis treatment equipment high-pressure pump and a second two-stage continuous reverse osmosis treatment equipment which are sequentially connected in series; the second two-stage continuous reverse osmosis treatment equipment is connected with the first reverse osmosis water outlet tank through a second two-stage continuous reverse osmosis treatment equipment feed pump and a second two-stage continuous reverse osmosis treatment equipment high-pressure pump, a concentrated solution outlet of the second two-stage continuous reverse osmosis treatment equipment is connected with a low molecular weight alcohol solution feed tank of the first continuous reverse osmosis equipment through a pipeline, a dialyzate outlet pipeline of the second two-stage continuous reverse osmosis treatment equipment is connected with an online COD detector, a three-way valve is connected behind the online COD detector, the three-way valve is connected with the low molecular weight alcohol solution feed tank and a reverse osmosis final water outlet tank through pipelines, and liquid behind the three-way valve enters the reverse osmosis final water outlet tank or flows back to the low molecular weight alcohol solution feed tank according to a COD detection result. Specifically, COD is the chemical oxygen demand of the liquid, and when the COD is less than or equal to 40mg/L, the liquid enters a reverse osmosis final water outlet tank; when the COD is higher than 40mg/L, the liquid enters a low molecular weight alcohol solution feeding tank.
The first-stage reverse osmosis concentration unit comprises a concentrated solution circulating tank, a reverse osmosis concentration device and a concentrated solution storage tank which are sequentially communicated; a reverse osmosis concentration treatment equipment high-pressure pump and a reverse osmosis concentration treatment equipment middle circulating pump are arranged between the concentrated solution circulating tank and the reverse osmosis concentration equipment; the dialysate outlet of the reverse osmosis concentration equipment is connected with the low molecular weight alcohol solution feeding tank of the first-stage two-stage continuous reverse osmosis treatment unit, and the concentrate outlet of the reverse osmosis concentration equipment is connected with the concentrate storage tank. The concentrated solution circulating tank is used for storing the concentrated solution of the first two-stage continuous reverse osmosis treatment equipment and a small amount of concentrated solution generated in the operation process of the first-stage reverse osmosis concentration unit; the purpose of the concentrate storage tank is to store the concentrate produced by the first reverse osmosis concentration unit.
Furthermore, a pump is added between two stages in each stage of two-stage continuous reverse osmosis treatment equipment connected in series, so that the membrane surface flow rate is increased, and the content of low molecular weight alcohol substances in the effluent of the continuous reverse osmosis equipment is reduced. The membrane surface refers to the surface of the reverse osmosis membrane, and the increase of the flow rate is helpful for reducing the deposition of alcohol substances on the surface of the reverse osmosis membrane, so that the alcohol concentration of the effluent is reduced.
And a dialysate water outlet pipe of the second two-stage continuous reverse osmosis treatment equipment is connected with the online COD detector, and the trend of the reverse osmosis dialysate is automatically adjusted through the three-way valve according to the COD test result.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the reverse osmosis treatment device solves the problem of reverse osmosis treatment of substances with lower retention rate (less than or equal to 75%) through adjustment and optimization of a process route, and achieves the purpose of standard discharge of treated effluent on the basis of improving the recovery rate and reducing the operation energy consumption. The utility model discloses a two sections continuous reverse osmosis equipment carry out the series connection technology, have realized the concentration of low molecular weight alcohol class solution and the recovery of alcohols material, and the rate of recovery is more than or equal to 99%, and the Chemical Oxygen Demand (COD) of the final aquatic after the processing reaches the earth's surface and discharges the requirement.
(2) The utility model discloses an online COD detector detects the COD of final play water to according to the trend of testing result determination play water, when COD surpassed the setting value, the three-way valve that the device had can flow back the play water to low molecular weight alcohol class solution feeding jar in, guaranteed the stability of final play water COD.
(3) The utility model discloses a concentration low molecular weight alcohol class substance's reverse osmosis process and device, can realize the final stability of water chemical oxygen demand of whole equipment through the ratio of adjusting concentrate and dislysate in the one-level reverse osmosis concentrator, the content of low molecular weight alcohol class substance in the feed liquid that can handle can reach 10000 ppm.
(4) The utility model discloses a two-stage continuous type reverse osmosis unit, the concentrate that every section continuous type reverse osmosis equipment produced is at this section internal recycle, and need not to enter into the feed tank to greatly reduced the circulation volume in the liquid treatment process, improved the operating efficiency, reduced the operation energy consumption and the treatment cost of device.
Drawings
FIG. 1 is a process flow diagram of a reverse osmosis unit for concentrating low molecular weight alcohol-containing substances according to the present invention.
Fig. 2 is an enlarged schematic view of a first continuous reverse osmosis unit.
Fig. 3 is an enlarged schematic view of a second continuous reverse osmosis unit.
FIG. 4 is an enlarged flow diagram of the first stage reverse osmosis concentration unit and the first continuous reverse osmosis unit.
In the drawings:
1-low molecular weight alcohol solution feeding tank, 2-first two-stage continuous reverse osmosis treatment equipment feeding pump, 3-first two-stage continuous reverse osmosis treatment equipment high-pressure pump, 4-first two-stage continuous reverse osmosis treatment equipment, 5-first reverse osmosis water outlet tank, 6-second two-stage continuous reverse osmosis treatment equipment feeding pump, 7-second two-stage continuous reverse osmosis treatment equipment high-pressure pump, 8-second two-stage continuous reverse osmosis treatment equipment, 9-online COD detector, 10-three-way valve, 11-concentrated solution circulating tank, 12-reverse osmosis concentration treatment equipment high-pressure pump, 13-reverse osmosis concentration treatment equipment intermediate circulating pump, 14-reverse osmosis concentration equipment, 15-concentrated solution storage tank and 16-reverse osmosis final water outlet tank.
41-first treatment equipment reverse osmosis membrane component I, 42-first treatment equipment reverse osmosis membrane component II, 81-second treatment equipment reverse osmosis membrane component I, 82-second treatment equipment reverse osmosis membrane component II.
Detailed Description
The technical solution in the embodiment of the present invention is described clearly and completely with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Example 1
As shown in FIG. 1, a reverse osmosis apparatus for concentrating a solution containing a low molecular weight alcohol comprises a one-stage reverse osmosis concentration unit and two-stage continuous reverse osmosis treatment units using an internal circulation process; the first-stage reverse osmosis concentration unit is communicated with the two sections of two-stage continuous reverse osmosis treatment units.
The first-stage two-stage continuous reverse osmosis treatment unit comprises a low molecular weight alcohol solution feeding tank 1, a first two-stage continuous reverse osmosis treatment device 4 and a first reverse osmosis water outlet tank 5 which are sequentially connected in series, wherein the low molecular weight alcohol solution feeding tank 1 is connected with a first two-stage continuous reverse osmosis treatment device feeding pump 2 and a first two-stage continuous reverse osmosis treatment device high-pressure pump 3 of the first two-stage continuous reverse osmosis treatment device 4 through pipelines, a concentrated liquid outlet of the first two-stage continuous reverse osmosis treatment device 4 is connected with a concentrated liquid circulating tank 11 of the first-stage reverse osmosis concentration unit through a pipeline, and a dialyzate outlet of the first two-stage continuous reverse osmosis treatment device 4 is connected with the first reverse osmosis water outlet tank 5.
Wherein the first two-stage continuous reverse osmosis treatment device 4 comprises a first treatment device reverse osmosis membrane component I41 and a second treatment device reverse osmosis membrane component II 42.
The second-stage two-stage continuous reverse osmosis treatment unit comprises a second two-stage continuous reverse osmosis treatment equipment feed pump 6, a second two-stage continuous reverse osmosis treatment equipment high-pressure pump 7 and a second two-stage continuous reverse osmosis treatment equipment 8 which are sequentially connected in series; the second two-stage continuous reverse osmosis treatment device 8 is connected with the first reverse osmosis water outlet tank 5 through a second two-stage continuous reverse osmosis treatment device feed pump 6 and a second two-stage continuous reverse osmosis treatment device high-pressure pump 7, a concentrated solution outlet of the second two-stage continuous reverse osmosis treatment device 8 is connected with the low molecular weight alcohol solution feed tank 1 of the first continuous reverse osmosis device through a pipeline, a dialyzate outlet pipeline of the second two-stage continuous reverse osmosis treatment device 8 is connected with the online COD detector 9, a three-way valve 10 is connected behind the online COD detector 9, the three-way valve 10 is connected with the low molecular weight alcohol solution feed tank 1 and the reverse osmosis final water outlet tank 16 through pipelines, and liquid behind the three-way valve enters the reverse osmosis final water outlet tank 16 or flows back to the low molecular weight alcohol solution feed tank 1 according to a COD detection result. Specifically, COD is the chemical oxygen demand of the liquid, and when the COD is less than or equal to 40mg/L, the liquid enters the reverse osmosis final water outlet tank 16; when the COD is higher than 40mg/L, the liquid enters a low molecular weight alcohol solution feeding tank 1.
Wherein the second two-stage continuous reverse osmosis treatment device 8 comprises a first reverse osmosis membrane module 81 of the second treatment device and a second reverse osmosis membrane module 82 of the second treatment device.
The first-stage reverse osmosis concentration unit comprises a concentrated solution circulating tank 11, a reverse osmosis concentration device 14 and a concentrated solution storage tank 15 which are sequentially communicated; a reverse osmosis concentration treatment equipment high-pressure pump 12 and a reverse osmosis concentration treatment equipment middle circulating pump 13 are arranged between the concentrated solution circulating tank 11 and the reverse osmosis concentration equipment 14; the dialysate outlet of the reverse osmosis concentration device 14 is connected with the low molecular weight alcohol solution feed tank 1 of the first stage two-stage continuous reverse osmosis treatment unit, and the concentrate outlet of the reverse osmosis concentration device 14 is connected with the concentrate storage tank 15. The concentrated solution circulating tank 11 is used for storing the concentrated solution of the first two-stage continuous reverse osmosis treatment equipment and a small amount of concentrated solution generated in the operation process of the first-stage reverse osmosis concentration unit; the purpose of the concentrate storage tank 15 is to store the concentrate produced by the first stage reverse osmosis concentration unit.
Furthermore, a pump is added between two stages in each stage of two-stage continuous reverse osmosis treatment equipment connected in series, so that the membrane surface flow rate is increased, and the content of low molecular weight alcohol substances in the effluent of the continuous reverse osmosis equipment is reduced. The membrane surface refers to the surface of the reverse osmosis membrane, and the increase of the flow rate is helpful for reducing the deposition of alcohol substances on the surface of the reverse osmosis membrane, so that the alcohol concentration of the effluent is reduced.
Example 2
A reverse osmosis process for concentrating a solution containing a low molecular weight alcohol, characterized by: the method comprises the following steps:
a1, feeding liquid containing low molecular weight alcohol substances into a low molecular weight alcohol solution feeding tank 1 of a first-stage two-stage continuous reverse osmosis treatment unit, passing through a first two-stage continuous reverse osmosis treatment device 4 of the first-stage two-stage continuous reverse osmosis treatment unit, feeding the generated concentrated liquid into a concentrated liquid circulating tank 11 of a first-stage reverse osmosis concentration unit, and feeding the generated dialyzate into a first reverse osmosis water outlet tank 5, wherein the concentration of the low molecular weight alcohol substances in the feeding liquid in the step A1 is 2000-10000 ppm, preferably 2000-6000 ppm; in the step A1, the ratio of the dialysate to the concentrated solution in the first two-stage continuous reverse osmosis treatment equipment 4 can be adjusted according to the concentration of low molecular weight alcohol substances in the feed liquid, and the adjustment ratio is 1: 1-4: 1.
A2, after entering a first reverse osmosis water outlet tank 5, the dialysate generated by a first two-stage continuous reverse osmosis treatment device 4 enters a second two-stage continuous reverse osmosis treatment device 8 for treatment through a second two-stage continuous reverse osmosis treatment device feed pump 6 and a second two-stage continuous reverse osmosis treatment device high-pressure pump 7 in a second two-stage continuous reverse osmosis treatment unit, the generated concentrated solution returns to a low molecular weight alcohol solution feed tank 1 of the first two-stage continuous reverse osmosis treatment unit, and the generated dialysate enters an online COD detector 9 for COD detection; in the step A2, the ratio of the dialysate to the concentrated solution in the second two-stage continuous reverse osmosis treatment device 8 can be adjusted according to the concentration of low molecular weight alcohol substances in the feed liquid, and the adjustment ratio is 1: 1-4: 1. The dialysate outlet pipe of the second two-stage continuous reverse osmosis treatment device 8 is connected with the online COD detector, and the trend of the reverse osmosis dialysate is automatically adjusted through the three-way valve according to the COD test result.
A3: concentrated solution generated by first two-stage continuous reverse osmosis treatment equipment in the first-stage two-stage continuous reverse osmosis treatment unit enters a concentrated solution circulating tank 11 of the first-stage reverse osmosis concentration unit, enters a reverse osmosis concentration device 14 for concentration treatment through a middle circulating pump 13 of the reverse osmosis concentration treatment equipment through a pipeline, the concentrated solution generated after treatment enters a concentrated solution storage tank 15, and the generated dialysate enters a low-molecular-weight alcohol solution feeding tank 1 of the first-stage two-stage continuous reverse osmosis treatment unit. In the step A3, the ratio of the dialysate to the concentrated solution in the reverse osmosis concentration device 14 can be adjusted according to the concentration of low molecular weight alcohol substances in the feed liquid, and the ratio is adjusted to be 1: 1-2: 1.
The reverse osmosis treatment device solves the problem of reverse osmosis treatment of substances with lower retention rate (less than or equal to 75%) through adjustment and optimization of a process route, and achieves the purpose of standard discharge of treated effluent on the basis of improving the recovery rate and reducing the operation energy consumption. The utility model discloses a two sections continuous reverse osmosis equipment carry out the series connection technology, have realized the concentration of low molecular weight alcohol class solution and the recovery of alcohols material, and the rate of recovery is more than or equal to 99%, and the Chemical Oxygen Demand (COD) of the final aquatic after the processing reaches the earth's surface and discharges the requirement. The COD detector is used for detecting the COD of the final effluent, the trend of the effluent is determined according to the detection result, and when the COD exceeds a set value, the three-way valve arranged on the device can enable the effluent to flow back into the low molecular weight alcohol solution feeding tank, so that the stability of the final effluent COD is ensured.
The reverse osmosis process and the device of the alcohol substances with low molecular weight and low concentration can realize the stability of the chemical oxygen consumption of the final effluent of the whole device by adjusting the ratio of the concentrated solution to the dialyzate in the first-stage reverse osmosis concentration equipment, and the content of the alcohol substances with low molecular weight in the feed liquid which can be treated can reach 10000 ppm. The two-section two-stage continuous reverse osmosis device is adopted, and the concentrated solution generated by each section of continuous reverse osmosis equipment circulates in the section without entering a feeding tank, so that the circulation amount in the liquid treatment process is greatly reduced, the operation efficiency is improved, and the operation energy consumption and the treatment cost of the device are reduced.
Claims (5)
1. A reverse osmosis apparatus for concentrating a solution containing a low molecular weight alcohol, characterized by: comprises a first-stage reverse osmosis concentration unit adopting an internal circulation process and two-stage continuous reverse osmosis treatment units; the first-stage reverse osmosis concentration unit is communicated with the two sections of two-stage continuous reverse osmosis treatment units;
and a pump which is added between the sections and is used for increasing the flow rate of the membrane surface and reducing the content of low molecular weight alcohol substances in the effluent of the continuous reverse osmosis equipment is added between two stages of continuous reverse osmosis treatment equipment which are connected in series in each section.
2. A reverse osmosis apparatus for concentrating a low molecular weight alcohol-containing solution according to claim 1, wherein: the first-stage two-stage continuous reverse osmosis treatment unit comprises a low molecular weight alcohol solution feeding tank (1), a first two-stage continuous reverse osmosis treatment device (4) and a first reverse osmosis water outlet tank (5) which are sequentially connected in series, wherein the low molecular weight alcohol solution feeding tank (1) is connected with a first two-stage continuous reverse osmosis treatment device feeding pump (2) and a first two-stage continuous reverse osmosis treatment device high-pressure pump (3) of the first two-stage continuous reverse osmosis treatment device (4) through pipelines, a concentrated liquid outlet of the first two-stage continuous reverse osmosis treatment device (4) is connected with a concentrated liquid circulating tank (11) of the first-stage reverse osmosis concentration unit through a pipeline, and a dialyzate liquid outlet of the first two-stage continuous reverse osmosis treatment device (4) is connected with the first reverse osmosis water outlet tank (5).
3. A reverse osmosis apparatus for concentrating a low molecular weight alcohol-containing solution according to claim 1, wherein: the second-stage two-stage continuous reverse osmosis treatment unit comprises a second two-stage continuous reverse osmosis treatment equipment feed pump (6), a second two-stage continuous reverse osmosis treatment equipment high-pressure pump (7) and second two-stage continuous reverse osmosis treatment equipment (8) which are sequentially connected in series; the second two-stage continuous reverse osmosis treatment equipment (8) is connected with the first reverse osmosis water outlet tank (5) through a second two-stage continuous reverse osmosis treatment equipment feed pump (6) and a second two-stage continuous reverse osmosis treatment equipment high-pressure pump (7), a concentrated solution outlet of the second two-stage continuous reverse osmosis treatment equipment (8) is connected with the low molecular weight alcohol solution feed tank (1) of the first continuous reverse osmosis equipment through a pipeline, a dialyzate outlet pipeline of the second two-stage continuous reverse osmosis treatment equipment (8) is connected with an online COD detector (chemical oxygen demand) 9, a three-way valve (10) is connected behind the online COD detector (9), the three-way valve (10) is connected with the low molecular weight alcohol solution feeding tank (1) and the reverse osmosis final water outlet tank (16) through pipelines, and liquid behind the three-way valve (10) enters the reverse osmosis final water outlet tank (16) or flows back to the low molecular weight alcohol solution feeding tank (1) according to a COD detection result.
4. A reverse osmosis apparatus for concentrating a low molecular weight alcohol-containing solution according to claim 1, wherein: the first-stage reverse osmosis concentration unit comprises a concentrated solution circulating tank (11), a reverse osmosis concentration device (14) and a concentrated solution storage tank (15) which are sequentially communicated; a reverse osmosis concentration treatment equipment high-pressure pump (12) and a reverse osmosis concentration treatment equipment middle circulating pump (13) are arranged between the concentrated solution circulating tank (11) and the reverse osmosis concentration equipment (14); the dialysate outlet of the reverse osmosis concentration equipment (14) is connected with the low molecular weight alcohol solution feeding tank (1) of the first stage two-stage continuous reverse osmosis treatment unit, and the concentrate outlet of the reverse osmosis concentration equipment (14) is connected with the concentrate storage tank (15).
5. A reverse osmosis apparatus for concentrating a low molecular weight alcohol-containing solution according to claim 1, wherein: a dialysate outlet pipe of the second two-stage continuous reverse osmosis treatment device (8) is connected with an on-line COD detector (9), and the trend of the reverse osmosis dialysate is automatically adjusted through a three-way valve (10) according to the COD test result.
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