Efficient organic matter membrane separation device

Abstract

The utility model discloses an efficient organic matter membrane separation device, which belongs to the field of water treatment and comprises a water inlet tank, a precision filter, an organic separation membrane and a tubular membrane electrode which are sequentially connected, the water inlet tank is connected with the precision filter through a first communication pipeline, and the precision filter is connected with the organic separation membrane through a second communication pipeline. The organic separation membrane is connected with a water outlet pipe, the organic separation membrane is connected with the tubular membrane electrode through a third communicating pipe, the third communicating pipe is provided with an acid liquor adding device, wastewater is concentrated through the organic separation membrane to provide a high-concentration substrate for the tubular membrane electrode, and the organic separation membrane and the tubular membrane electrode cooperate to increase the comprehensive COD removal rate of the high-salinity wastewater and improve the treatment capacity; the tubular membrane electrode effectively reduces energy consumption during high-COD water inflow, and the device reduces medicament cost and secondary pollution through physical and electrochemical reactions, so that the problems of the existing method in the aspects of removal rate, energy consumption, medicament cost and secondary pollution are solved.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to a high-efficiency organic membrane separation device. Background Technology

[0002] In industrial wastewater zero-discharge projects, treating organic matter in high-salinity wastewater presents numerous technical challenges. Firstly, the use of RO / NF membrane technology to treat wastewater salinity leads to an increase in COD concentration as the membrane concentrates, resulting in severe RO / NF membrane fouling, frequent chemical cleaning, a significantly shortened membrane lifespan, and a surge in operating and maintenance costs. Furthermore, when the membrane concentrate enters the evaporation and crystallization system, the high organic matter concentration increases the impurity salt rate and causes mist entrainment, affecting condensate quality. Therefore, the treatment of organic matter in high-salinity wastewater from zero-discharge projects is particularly critical.

[0003] Existing COD treatment methods each have their drawbacks. While ozone oxidation has strong oxidizing properties and no secondary pollution, the ozone generator requires high power, consumes a lot of electricity, and is costly. Furthermore, its COD removal rate in highly saline water is only 20%-30%. Fenton oxidation is simple to operate and requires less investment. It can remove COD using hydroxyl radicals under acidic conditions, but if the raw water is neutral or alkaline, acid must be added, requiring large amounts of hydrogen peroxide and ferrous sulfate, resulting in high reagent costs and the generation of iron sludge causing secondary pollution, thus limiting its application in wastewater treatment. Electrochemical methods utilize electrocatalytic active anodes to generate hydroxyl radicals, but the use of precious metal electrodes leads to high initial investment, high energy consumption, and persistently high costs. Therefore, a high-efficiency organic matter membrane separation device is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a high-efficiency organic membrane separation device to solve the problems of low removal rate, high reagent cost and easy secondary pollution, large initial investment and high energy consumption in the existing ozone oxidation, Fenton oxidation and electrochemical methods for treating COD in industrial high-salt wastewater.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency organic membrane separation device, comprising an inlet tank, a precision filter, an organic separation membrane, and a tubular membrane electrode connected in sequence. The inlet tank is connected to the precision filter via a first connecting pipe, the precision filter is connected to the organic separation membrane via a second connecting pipe, the organic separation membrane is connected to an outlet pipe, the organic separation membrane is connected to the tubular membrane electrode via a third connecting pipe, an acid dosing device is installed on the third connecting pipe, and the tubular membrane electrode is connected to the inlet tank via a fourth connecting pipe to form a circulation loop.

[0006] Furthermore, an inlet pump is installed on the first connecting pipe, and a circulation pump is installed on the second connecting pipe.

[0007] Furthermore, the inlet pump and the circulation pump are variable frequency pumps.

[0008] Furthermore, a level gauge is installed on the water inlet tank.

[0009] Furthermore, the precision filter has a filter accuracy of 5μm, and pressure gauges are installed on both the No. 1 and No. 2 connecting pipes connecting the inlet and outlet of the precision filter.

[0010] Furthermore, the concentrated water from the organic separation membrane is divided into two streams. One stream of concentrated water is connected to the No. 2 connecting pipe connected to the inlet of the organic separation membrane, and the other stream of concentrated water is transported to the tubular membrane electrode through the No. 3 connecting pipe.

[0011] Furthermore, pressure transmitters are installed on both the No. 2 connecting pipe connected to the inlet of the organic separation membrane and the No. 3 connecting pipe connected to the outlet of the organic separation membrane.

[0012] Furthermore, a cleaning water inlet pipe is provided on the first connecting pipe, a cleaning water outlet pipe is provided on the third connecting pipe, and a cleaning water outlet pipe is provided on the outlet pipe.

[0013] Furthermore, the acid dosing device adjusts the pH of the concentrated water to 5-6.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This high-efficiency organic membrane separation device concentrates wastewater through an organic separation membrane to provide a high-concentration substrate for a tubular membrane electrode. The two work synergistically to increase the overall COD removal rate of high-salt wastewater and improve treatment capacity. The tubular membrane electrode effectively reduces energy consumption when using high-COD influent. Furthermore, the device reduces reagent costs and secondary pollution through physical and electrochemical reactions, solving the problems of existing methods in terms of removal rate, energy consumption, reagent costs, and secondary pollution. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a high-efficiency organic membrane separation device.

[0017] In the diagram: 1. Inlet tank; 2. Inlet pump; 3. Precision filter; 4. Circulation pump; 5. Organic separation membrane; 51. Discharge gate; 6. Tubular membrane electrode; 71. Connecting pipe No. 1; 72. Connecting pipe No. 2; 73. Connecting pipe No. 3; 74. Connecting pipe No. 4; 75. Outlet pipe; 81. Cleaning water inlet pipe; 82. Cleaning water outlet pipe No. 1; 83. Cleaning water outlet pipe No. 2. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments.

[0019] The following embodiments are used to illustrate the present invention, but should not be used to limit the scope of protection of the present invention. The conditions in the embodiments can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0020] Please see Figure 1 This utility model provides a high-efficiency organic membrane separation device, comprising an inlet tank 1, a precision filter 3, an organic separation membrane 5, and a tubular membrane electrode 6 connected in sequence. An inlet pump 2 is installed on the first connecting pipe 71 connecting the inlet tank 1 and the precision filter 3. A circulation pump 4 is installed on the second connecting pipe 72 connecting the precision filter 3 and the organic separation membrane 5. An outlet pipe 75 is connected to the organic separation membrane 5. An acid dosing device is installed on the third connecting pipe 73 connecting the organic separation membrane 5 and the tubular membrane electrode 6. The tubular membrane electrode 6 is connected to the inlet tank 1 through a fourth connecting pipe 74.

[0021] A level gauge is installed on the water inlet tank 1. When the liquid level is high, the water intake will stop, and when the liquid level is low, the system will shut down.

[0022] The inlet pump 2 is a variable frequency pump. Since the flow rate needs to be calculated and confirmed based on the recovery rate of the organic separation membrane 5, the head is determined by comprehensively considering the pressure difference of the precision filter and the osmotic pressure of the organic separation membrane. Given the unstable osmotic pressure of the organic separation membrane, the inlet pump 2 needs to be frequency-controlled in order to ensure that it can accurately adapt to changes in operating conditions.

[0023] The precision filter 3 has a filter accuracy of 5μm, which can effectively remove suspended solids and impurities in the water. Pressure gauges are installed at the inlet and outlet. When the pressure difference is greater than 0.1MPa, the filter element needs to be replaced.

[0024] The head of the circulating pump 4 is determined based on the pressure difference of the organic separation membrane. Due to the instability of the flow rate, frequency conversion is required, so a frequency converter pump is used.

[0025] The concentrate from the organic separation membrane 5 is divided into two paths: one path is connected to the No. 2 connecting pipe 72 connected to the inlet of the organic separation membrane 5, and the other path is connected to the tubular membrane electrode 6. Since the inlet flow rate of the organic separation membrane 5 is determined according to the number of membranes in the organic separation membrane 5, the inlet flow rate of each membrane is kept constant, which can reduce the risk of scaling. The part with insufficient inlet flow rate is supplemented with concentrate to increase the inlet flow rate of the organic separation membrane 5 and ensure that the inlet flow rate of each membrane is kept constant.

[0026] Pressure transmitters are installed on the No. 2 connecting pipe 72 connected to the inlet of the organic separation membrane 5 and the No. 3 connecting pipe 73 connected to the outlet of the organic separation membrane 5. When the pressure difference of the organic separation membrane 5 reaches 0.3MPa, it needs to be cleaned.

[0027] A cleaning water inlet pipe 81 is provided on the first connecting pipe 71, a first cleaning water outlet pipe 82 is provided on the third connecting pipe 73, and a second cleaning water outlet pipe 83 is provided on the outlet pipe 75; cleaning water is injected through the cleaning water inlet pipe 81, and after flowing in the system, the cleaning water is discharged from the first cleaning water outlet pipe 82 and the second cleaning water outlet pipe 83.

[0028] The concentrated water after organic matter separation membrane 5 has a high COD content, approximately four times that of the influent, providing favorable conditions for the tubular membrane electrode 6. The concentrated water is acidified to adjust the pH to 5-6 before entering the tubular membrane electrode 6 for COD removal. The tubular membrane electrode 6 mainly consists of a pair of perforated cathodes and a metal oxide-coated microporous anode. As reactants flow through the electrode with the water, each pore of the tubular microporous electrode acts as numerous miniature reactors, thereby improving the efficiency of the electrochemical reaction. The COD removal rate of the tubular membrane electrode 6 reaches 60%. The effluent enters the influent tank 1 for circulation. After several circulations, the system reaches equilibrium, achieving a comprehensive COD removal rate of 65%.

[0029] With the organic separation membrane 5 having a recovery rate of 80%, the tubular membrane electrode 6 can process only 20% of the raw water, greatly reducing the amount of chemicals (acid) required, thus resulting in low operating costs per ton of water.

[0030] Example: Industrial wastewater, influent COD: 400 mg / L, product COD: 140 mg / L, flow rate: 10 m³ 3 / h.

[0031] Equipment configuration:

[0032] Water inlet tank 1:1 unit, V=10m3;

[0033] 2:1 inlet pump, Q=15m 3 / h, H=0.7MPa;

[0034] Precision filter 3: 1 unit, Q = 15m 3 / h, filtration accuracy 5μm;

[0035] Circulating pump 4: 1 unit, Q = 30m 3 / h, H=0.5MPa;

[0036] Organic separation membrane 5:1 set, Q output = 10m 3 / h, recovery rate 80%;

[0037] Tubular membrane electrode 6: 1 set, Q = 3m 3 / h;

[0038] The inlet flow rate of water tank 1 is maintained at 10m³ / h. 3 / h, when the water level in the tank is greater than 1m, start the inlet pump 2 to pump into the precision filter 3, and start the circulation pump 4 to enter the organic separation membrane 5. The recovery rate of the organic separation membrane 5 is set to 80%. In the first 5 minutes after startup, the product water cannot reach COD ~140mg / L, so open the discharge valve 51 to discharge into the ditch. After 5 minutes, the product water COD reaches 140mg / L, and close the discharge valve 51; concentrate flow ~2.5m 3 The pH is adjusted to 5.5 by adding acid per hour, and then the water enters the tubular membrane electrode 6. The effluent COD is ~700mg / L and enters the inlet tank 1 for circulation.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high efficiency organic membrane separation device, characterized by: It comprises water inlet tank (1), precision filter (3), organic separation membrane (5) and tubular membrane electrode (6) connected in sequence, the water inlet tank (1) is connected with precision filter (3) through No. 1 communication pipeline (71), the precision filter (3) is connected with organic separation membrane (5) through No. 2 communication pipeline (72), the organic separation membrane (5) is connected with water outlet pipe (75), the organic separation membrane (5) is connected with tubular membrane electrode (6) through No. 3 communication pipeline (73), the No. 3 communication pipeline (73) is provided with acid liquid adding device, the tubular membrane electrode (6) is connected with water inlet tank (1) through No. 4 communication pipeline (74) to form circulation loop.

2. The high efficiency organic membrane separation device of claim 1, wherein: The No. 1 communication pipeline (71) is provided with water inlet pump (2), and the No. 2 communication pipeline (72) is provided with circulating pump (4).

3. The high efficiency organic membrane separation device of claim 2, wherein: The water inlet pump (2) and circulating pump (4) are variable frequency pumps.

4. The high efficiency organic membrane separation device of claim 1, wherein: The water inlet tank (1) is provided with liquid level meter.

5. The high efficiency organic membrane separation device of claim 1, wherein: The precision filter (3) has filter precision of 5 μm, and the precision filter (3) is provided with pressure gauge on No. 1 communication pipeline (71) and No. 2 communication pipeline (72) connected with water inlet and outlet.

6. The high efficiency organic membrane separation device of claim 1, wherein: The concentrated water of the organic separation membrane (5) is divided into two ways, one way of concentrated water is connected with No. 2 communication pipeline (72) connected with water inlet of organic separation membrane (5), and the other way of concentrated water is delivered to tubular membrane electrode (6) through No. 3 communication pipeline (73).

7. The high efficiency organic membrane separation device of claim 1, wherein: The No. 2 communication pipeline (72) connected with water inlet of organic separation membrane (5) and No. 3 communication pipeline (73) connected with water outlet of organic separation membrane (5) are provided with pressure transmitter.

8. The high efficiency organic membrane separation device of claim 1, wherein: The No. 1 communication pipeline (71) is provided with cleaning water inlet pipe (81), the No. 3 communication pipeline (73) is provided with No. 1 cleaning water outlet pipe (82), and the water outlet pipe (75) is provided with No. 2 cleaning water outlet pipe (83).

9. The high efficiency organic membrane separation device of claim 6, wherein: The acid liquid adding device adjusts the PH of concentrated water to 5-6.

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