CN113428947A - Automatic control electrodialysis system and use method thereof - Google Patents
Automatic control electrodialysis system and use method thereof Download PDFInfo
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- CN113428947A CN113428947A CN202110607043.6A CN202110607043A CN113428947A CN 113428947 A CN113428947 A CN 113428947A CN 202110607043 A CN202110607043 A CN 202110607043A CN 113428947 A CN113428947 A CN 113428947A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention provides an automatic control electrodialysis system and a using method thereof, comprising a desalination circulation unit, a concentrated water-polar water circulation unit, a washing unit, a cleaning unit, an acid adding unit, an instrument and an automatic control unit; wherein: the desalination circulation unit comprises an electrodialysis membrane stack, a fresh water circulation pipeline, a concentrated water circulation pipeline and an electrode water circulation pipeline; the concentrated water-polar water circulating unit comprises a polar water cache tank; the flushing unit comprises a water inlet valve and a water outlet valve; the cleaning unit comprises a cleaning pump, a cleaning tank and a cleaning filter; the acid adding unit comprises a concentrated chamber acid box, a polar chamber acid box and a dilute chamber acid box; the meter and the automatic control unit comprise a flowmeter, a static pressure liquid level meter, a pH meter, a rotor flowmeter, a temperature sensor, a pressure sensor and a conductivity sensor, and the invention also discloses a use method of the automatic control electrodialysis system.
Description
Technical Field
The invention belongs to the technical field of electrodialysis, and particularly relates to an automatic control electrodialysis system and a using method thereof.
Background
Electrodialysis is a membrane separation operation that removes or enriches electrolytes from solutions by using the permselectivity of ion exchange membranes (i.e., positive membranes allow cations to permeate but exclude blocking anions, and negative membranes allow anions to permeate but exclude blocking cations) as a driving force of potential difference. Electrodialysis is a mature technology in the membrane separation process, has been widely applied to brackish water desalination, and is a main method for producing fresh water in some regions of the world. Because the charged membrane has higher selectivity, lower membrane resistance, better thermal stability and chemical stability and high mechanical strength, the electrodialysis process is not only limited to be applied to desalination, but also has wide application in food, medicine, chemical industry and industrial wastewater.
Currently, electrodialysis operation systems are commonly used, such as a circulating continuous desalination system, a circulating intermittent desalination system and an automatic control of frequent reverse Electrodialysis (EDR). The salt in the wastewater can be removed highly by the cyclic continuous desalination and the cyclic intermittent desalination, so that the salt water in the wastewater is transferred into the concentrated water. However, in the desalination process of electrodialysis, calcium magnesium ions, sulfate radicals, carbonate ions and the like exist in the wastewater, and as the concentration of electrodialysis is continuously increased, calcium magnesium ions, sulfate radicals and carbonate ions in a concentrated chamber are continuously increased, scaling of calcium sulfate, calcium carbonate, magnesium carbonate and the like can occur, and in addition, if the electrodialysis is applied to high-salt wastewater containing higher organic matters, the surface of an anion exchange membrane can be polluted, so that the normal operation of electrodialysis is seriously influenced. To the existence of inorganic scale and organic matter pollution in the prior electrodialysis technology, the problem can be solved to a certain extent by automatically controlling frequent reverse Electrodialysis (EDR), but the automatic control frequent reverse Electrodialysis (EDR) generally carries out one-time reverse polarity within 15-20 min, a large amount of water is needed to be adopted for cleaning in the reverse polarity process, and the process of electrodialysis concentration is seriously influenced in the process.
Disclosure of Invention
In order to solve the technical problem that the electrodialysis concentration process is influenced by the fact that a large amount of water is needed for cleaning when frequent electrode inversion Electrodialysis (EDR) is automatically controlled, the invention provides an automatic control electrodialysis system and a using method thereof.
The invention adopts the following technical scheme:
an automatic control electrodialysis system comprises a desalination circulation unit, a concentrated water-polar water circulation unit, a flushing unit, a cleaning unit, an acid adding unit, an instrument and an automatic control unit; wherein:
the desalination circulation unit comprises an electrodialysis membrane stack, a fresh water circulation pipeline, a concentrated water circulation pipeline and an electrode water circulation pipeline, wherein the electrodialysis membrane stack comprises a dilute chamber, a concentrated chamber and an electrode chamber; the fresh water circulating pipeline comprises: the water outlet of the fresh water filter is connected with a first water inlet of a fresh water tank of the fresh water tank, the water outlet of the fresh water tank is divided into two branches after sequentially passing through a fresh water circulating pump and a heat exchanger, one branch is connected with a first water inlet of a fresh chamber of the fresh chamber through a fresh water first water inlet valve, the other branch is connected with a first water inlet of a dense chamber through a fresh water second water inlet valve, the first water outlet of the fresh chamber is divided into two branches, one branch is connected with a second water inlet of the fresh water tank through a first water outlet valve of the fresh chamber, and the other branch is connected with a first water inlet of the dense water tank through; the concentrated water circulating pipeline comprises: the water outlet of the concentrated water tank is divided into two branches after sequentially passing through a concentrated water circulating pump and a concentrated water filter, one branch is connected with a first water inlet of a concentrated chamber of the concentrated chamber through a concentrated water first water inlet valve, the other branch is connected with a first water inlet of a dilute chamber through a concentrated water second water inlet valve, the first water outlet of the concentrated chamber is divided into two branches, one branch is connected with the first water inlet of the concentrated water tank through a first water outlet valve of the concentrated chamber, and the other branch is connected with a second water inlet of the dilute water tank through a second water outlet valve of the concentrated chamber; the polar water circulation pipeline comprises: the water outlet of the polar water tank is connected with the first water inlet of the polar chamber after sequentially passing through the polar water circulating pump, the polar water filter and the polar water heat exchanger, and the first water outlet of the polar chamber is connected with the first water inlet of the polar water tank;
the concentrated water-polar water circulating unit comprises a polar water cache tank, and a circulating pipeline is as follows: the second water outlet of the polar chamber is connected with the water inlet of the polar water buffer tank, the second water outlet of the concentration chamber is connected with the second water inlet of the polar water tank, and the water outlet of the polar water buffer tank is connected with the second water inlet of the concentration tank;
the flushing unit comprises a water inlet valve and a water outlet valve, and the circulating pipeline comprises: the water inlet pipeline is connected with the flushing water inlets of the diluting chamber, the concentrating chamber and the polar chamber after passing through the water inlet valve, and the water outlets of the diluting chamber, the concentrating chamber and the polar chamber are connected with the water outlet pipeline after passing through the water outlet valve;
the cleaning unit comprises a cleaning pump, a cleaning tank and a cleaning filter, and a water outlet of the cleaning tank is connected with the water inlet pipeline after passing through the cleaning pump and the cleaning filter;
the acid adding unit comprises a concentrated acid tank, a polar acid tank and a dilute acid tank, wherein an acid outlet of the concentrated acid tank is connected with an acid inlet of a concentrated water tank through a metering pump;
the instrument and the automatic control unit comprise flow meters arranged at a first water inlet of the fresh water tank, a water outlet of the fresh chamber and a water outlet of the concentrated chamber, static pressure liquid level meters arranged on the fresh water tank, the concentrated water tank, the polar water tank and the cleaning tank, pH measuring instruments arranged on the fresh water tank, the concentrated water tank, the polar water tank and the cleaning tank, rotor flow meters arranged at a first water inlet of the fresh chamber, a first water inlet of the concentrated chamber and a first water inlet of the polar chamber, temperature sensors arranged at a first water inlet of the fresh chamber, a first water inlet of the concentrated chamber and a first water inlet of the polar chamber, pressure sensors arranged at a first water inlet of the fresh chamber, a first water outlet of the fresh chamber, a first water inlet of the concentrated chamber and a first water outlet of the concentrated chamber, and conductivity sensors arranged at a water outlet of the fresh chamber and a water outlet of the concentrated chamber.
Furthermore, a fan and an alkali absorption box are further arranged, an air inlet of the fan is connected with the atmosphere, and an air outlet passes through the polar water tank and then is connected with an air inlet of the alkali absorption box.
Furthermore, a back pressure valve is arranged at the outlet of the metering pump.
A method of using an automatically controlled electrodialysis system, comprising the steps of:
adding a sodium chloride solution with the mass fraction of 3% into the polar chamber, and adding water into the concentration chamber;
adding wastewater, enabling the wastewater to enter a fresh water tank after passing through a fresh water filter, stopping water inlet when a static pressure liquid level meter on the fresh water tank reaches a preset liquid level, lifting the wastewater by a fresh water circulating pump, then enabling the wastewater to enter a heat exchanger for heat exchange, and then enabling the wastewater to enter a fresh water chamber;
in the operation process, the fresh water tank, the concentrated water tank, the extreme water tank and the cleaning tank are added with acid according to the respectively arranged pH measuring instruments until the pH value reaches a preset value;
in the operation process, when the measured value of the conductivity sensor of the concentration chamber reaches a preset value, sending the polar water of the polar chamber into a polar water cache tank, supplementing the concentrated water of the concentration chamber to a polar water tank until the concentrated water reaches a supplement level value preset by a static pressure liquid level meter arranged on the polar water tank, and then discharging the residual concentrated water of the concentration tank until the residual concentrated water reaches a lower limit value preset by the static pressure liquid level meter arranged on the concentration tank;
adding the polar water in the polar water cache tank into a concentrated water tank, and then supplementing water to the concentrated water tank until a static pressure liquid level meter arranged on the concentrated water tank reaches a preset value;
after 4-12h, performing electrode reversing, closing the fresh water first water inlet valve, the fresh chamber first water outlet valve, the concentrated water first water inlet valve and the concentrated chamber first water outlet valve, and opening the fresh water second water inlet valve, the fresh chamber second water outlet valve, the concentrated water second water inlet valve and the concentrated chamber second water outlet valve, so that the fresh water enters the concentrated chamber for circulation, and the concentrated water enters the fresh chamber for circulation;
when the pressure sensor detects that the pressure difference between the inlet water and the outlet water of the dilute chamber and the concentrated chamber reaches a preset upper limit value, the inlet valve and the outlet valve are opened to flush and clean the membrane stack.
The invention has the beneficial effects that: the method combines the high concentration of the common electrodialysis and the pollution resistance of the frequent electrode reversal Electrodialysis (EDR), integrates the advantages of the common electrodialysis and the EDR, enables the wastewater with high salt content and high organic matter content to be processed by the electrodialysis and to stably run. The invention elaborates in detail from the aspect of the design and the operation mode of electrodialysis, and the design and the operation mode can achieve the purposes of high concentration multiplying power and stable operation.
Drawings
FIG. 1 is a schematic diagram of the configuration of an automatically controlled electrodialysis system according to the present invention;
FIG. 2 is a schematic diagram of the positions of water inlet, water outlet and water valve in an electrodialysis membrane stack according to the present invention;
fig. 3 is a partially enlarged view of a portion a of fig. 1;
fig. 4 is a schematic diagram of the piping of the water inlet and outlet pipes of the washing unit in the electrodialysis membrane stack.
Description of reference numerals: 100. an electrodialysis membrane stack, 11, a fresh water chamber, 1101, a first inlet of the fresh water chamber, 1102, a first outlet of the fresh water chamber, 1121, a first outlet valve of the fresh water chamber, 1122, a second outlet valve of the fresh water chamber, 12, a dense chamber, 1201, a first inlet of the dense chamber, 1202, a first outlet of the dense chamber, 1221, a first outlet valve of the dense chamber, 1222, a second outlet valve of the dense chamber, 13, a polar chamber, 1301, a first inlet of the polar chamber, 1302, a first outlet of the polar chamber, 1303, a second outlet, 101, a fresh water filter, 102, a fresh water tank, 1021, a first inlet of the fresh water tank, 1022, a second inlet of the fresh water tank, 103, a fresh water circulating pump, 104, a heat exchanger, 1041, a first inlet valve, 1042, a second inlet valve, 105, a dense water tank, 1051, a first inlet of the dense water tank, a inlet valve, a second inlet valve of the dense water tank, 106, a dense water circulating pump, 107, a dense water filter, 1071, a first inlet valve of the dense water first inlet valve, 1072, a second inlet of the dense water circulating pump, 108. the system comprises an electrode water tank, 1081, a first water inlet of the electrode water tank, 1082, a second water inlet of the electrode water tank, 109, an electrode water circulating pump, 110, an electrode water filter, 111, an electrode water heat exchanger, 201, an electrode water buffer tank, 202, a fan, 203, an alkali absorption tank, 301, a water inlet valve, 302, a water outlet valve, 401, a cleaning pump, 402, a cleaning tank, 403, a cleaning filter, 501, a concentrated acid tank, 502, an electrode acid tank, 503, a fresh acid tank, 504, a metering pump, 601, a flow meter, 602, a static pressure liquid level meter, 603, a pH meter, 604, a rotor flow meter, 605, a temperature sensor, 606, a pressure sensor, 607, an oxidation-reduction potential detector and 608 conductivity sensor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Example 1
As shown in fig. 1-3, an automatic control electrodialysis system comprises a desalination circulation unit, a concentrated water-polar water circulation unit, a washing unit, a cleaning unit, an acid adding unit, a meter and an automatic control unit; wherein:
the desalination circulation unit comprises an electrodialysis membrane stack 100, a fresh water circulation pipeline, a concentrated water circulation pipeline and a polar water circulation pipeline, wherein the electrodialysis membrane stack 100 comprises a dilute chamber 11, a concentrated chamber 12 and a polar chamber 13, and the fresh water circulation pipeline is as follows: the water outlet of the fresh water filter 101 is connected with a first fresh water tank water inlet 1021 of the fresh water tank 102, the water outlet of the fresh water tank 102 is divided into two branches after passing through a fresh water circulating pump 103 and a heat exchanger 104 in sequence, one branch is connected with a first fresh water inlet 1101 of the fresh water chamber 11 through a first fresh water inlet valve 1041, the other branch is connected with a first thick water inlet 1201 of the thick chamber through a second fresh water inlet valve 1042, the first fresh water outlet 1102 of the fresh water chamber is divided into two branches, one branch is connected with a second fresh water tank water inlet 1022 through a first fresh water outlet valve 1121, the other branch is connected with a first thick water tank water inlet 1051 through a second fresh water outlet valve 1122, the first fresh water inlet valve 1041 and the first fresh water outlet valve 1121 are opened, when the second fresh water outlet valve 1121 and the second fresh water outlet valve 1122 are closed, the waste water enters the fresh water filter 101 after being filtered, the waste water in the fresh water circulating pump 103 pumps the waste water in the fresh water tank 102, the waste water is heat exchanged through the heat exchanger 104 and then enters the fresh water chamber 11 in the electrodialysis membrane stack 100, the wastewater enters the fresh water tank 102 again for cyclic desalination after membrane stack treatment; the concentrated water circulating pipeline comprises: the water outlet of the concentrated water tank 105 is divided into two branches after passing through a concentrated water circulating pump 106 and a concentrated water filter 107 in sequence, one branch is connected with a first water inlet 1201 of a concentrated chamber 12 through a first concentrated water inlet valve 1071, the other branch is connected with a first water inlet 1101 of a dilute chamber through a second concentrated water inlet valve 1072, the first water outlet 1202 of the concentrated chamber is divided into two branches, one branch passes through a first water outlet valve 1221 of the concentrated chamber and is connected with a first water inlet 1051 of the concentrated water tank 105, the other branch passes through a second water outlet valve 1222 of the concentrated chamber and is connected with a second water inlet 1022 of the dilute water tank, the first water inlet valve 1071 of the concentrated water and the first water outlet valve 1221 of the concentrated chamber are opened, when the second water inlet valve 1072 of the concentrated water and the second water outlet valve 1222 of the concentrated chamber are closed, the concentrated water in the concentrated water tank 105 is lifted by the concentrated water circulating pump 106, impurities are filtered by the concentrated water filter 107, the concentrated water in the concentrated chamber 12 in the electrodialysis membrane stack 100 receives the salt content of the dilute chamber 11, and then enters the concentrated water tank 105 for circulation, when the polarity inversion is needed, closing the fresh water first inlet valve 1041, the fresh water first outlet valve 1121, the concentrated water first inlet valve 1071 and the concentrated chamber first outlet valve 1221, and opening the fresh water second inlet valve 1042, the fresh chamber second outlet valve 1122, the concentrated water second inlet valve 1072 and the concentrated chamber second outlet valve 1222 to circulate the fresh water in the concentrated chamber 12 and circulate the concentrated water in the fresh chamber 11; the polar water circulation pipeline comprises: the water outlet of the polar water tank 108 is sequentially connected with the first polar chamber water inlet 1301 after passing through the polar water circulating pump 109, the polar water filter 110 and the polar water heat exchanger 111, the first polar chamber water outlet 1302 is connected with the first polar water tank water inlet 1081, 3% of light salt water is added as polar water when the water purifier is used, the polar water is pumped into the polar water filter 110 through the polar water circulating pump 109 for filtration, impurities are removed, heat exchange is carried out through the polar water heat exchanger 111, the polar water enters the polar chamber 13 in the electrodialysis membrane stack 100, and then the polar water tank 108 is circulated;
the concentrated water-polar water circulating unit comprises a polar water cache tank 201, and a circulating pipeline is as follows: the second water outlet 1303 of the polar chamber 13 is connected with the water inlet of the polar water cache tank 201, the second water outlet 1203 of the concentration chamber is connected with the second water inlet 1082 of the polar water tank, and the water outlet of the polar water cache tank 201 is connected with the second water inlet 1052 of the concentration tank; when the conductivity in the concentration chamber 12 detected by the conductivity sensor 608 at the water outlet of the concentration chamber 12 reaches a preset value, the polar water in the polar chamber 12 is firstly sent into the polar water cache tank 201, the concentrated water is supplemented to the polar water tank 105, and then the polar water in the polar water cache tank 201 is sent into the concentrated water tank 105 under the action of gravity, so that the process of circulating the concentrated water and the polar water is achieved;
as shown in fig. 4, the flushing unit comprises a water inlet valve 301 and a water outlet valve 302, and the circulation line is: the water inlet pipeline is connected with flushing water inlets of the diluting chamber 11, the concentrating chamber 12 and the polar chamber 13 after passing through a water inlet valve 301, water outlets of the diluting chamber 11, the concentrating chamber 12 and the polar chamber 13 are connected with the water outlet pipeline after passing through a water outlet valve 302, when flushing operation is required, the water inlet valve 301 and the water outlet valve 302 are opened, flushing water enters the diluting chamber 11, the concentrating chamber 12 and the polar chamber 13 along the water inlet pipeline, and the flushing water is discharged from the water outlet pipeline after passing through the water outlet valve 302;
the cleaning unit comprises a cleaning pump 401, a cleaning tank 402 and a cleaning filter 403, a water outlet of the cleaning tank 402 is connected with the water inlet pipeline after passing through the cleaning pump 401 and the cleaning filter 403, the cleaning pump 401 pumps the cleaning liquid in the cleaning tank 402, the cleaning liquid passes through the cleaning filter 403, enters the water inlet pipeline, directly enters the dilute chamber 11, the concentrated chamber 12 and the polar chamber 13 in the electrodialysis membrane stack 100, and is discharged by the water outlet pipeline after flushing the membrane stack;
the acid adding unit comprises a concentrated acid tank 501, a polar acid tank 502 and a dilute acid tank 503 and is used for metering the acid amount added by each acid adding device, an acid outlet of the concentrated acid tank 501 is connected with an acid inlet of the concentrated water tank 105 through a metering pump 504, an acid outlet of the polar acid tank 502 is connected with an acid inlet of the polar water tank 108 through the metering pump 504, an acid outlet of the dilute acid tank 503 is connected with an acid inlet of the dilute water tank 102 through the metering pump 504, and the metering pump 504 is used for accurately adding acid;
the meter and automatic control unit comprises flow meters 601 arranged at a first water inlet 1021 of the fresh water tank, a water outlet of the fresh water chamber 11 and a water outlet of the thick water chamber 12, static pressure liquid level meters 602 arranged on the fresh water tank 102, the thick water tank 105, the polar water tank 108 and the cleaning tank 402, pH measuring instruments 603 arranged on the fresh water tank 102, the thick water tank 105, the polar water tank 108 and the cleaning tank 402, rotor flow meters 604 arranged at a first water inlet 1101 of the fresh water chamber, a first water inlet 1201 of the thick chamber and a first water inlet 1301 of the polar chamber, temperature sensors 605 arranged at the first water inlet 1101 of the fresh water chamber, the first water inlet 1201 of the thick chamber and the first water inlet 1301 of the polar chamber, pressure sensors 606 arranged at the first water inlet 1101 of the fresh water chamber, the first water outlet 1102 of the fresh water chamber, the first water inlet of the thick chamber and the first water outlet 1202 of the thick chamber, and used for detecting the pressure difference between the membrane and the front and back of the membrane stack, and the electric conductivity sensors 608 arranged at the water outlet of the thick chamber 12 at the water tank 11, the discharge of the fresh water and the concentrated water is controlled based on the detection value of the conductivity sensor 608.
The water inlet valve 301 and/or the water outlet valve 302 are/is an electric slow-opening valve, so that the pressure of the membrane stack is prevented from being pressed due to the quick opening and closing of the valves.
An oxidation-reduction potential detector 607 is also arranged at the first water inlet 1301 of the polar chamber and is used for monitoring the oxidation of polar water in the polar chamber 13.
The device is also provided with a fan 202 and an alkali absorption box 203, wherein an air inlet of the fan 202 is connected with the atmosphere, an air outlet passes through the polar water box 108 and then is connected with an air inlet of the alkali absorption box 203, the fan 202 continuously works in a working state, and gas generated by the polar chamber 13 is blown into the alkali absorption box 203 for elution.
A back pressure valve is arranged at the outlet of the metering pump 504, so that acid is prevented from being continuously added through siphoning after the metering pump 504 is stopped.
When the device is used, firstly, 3% of prepared light salt water is added into the pole chamber 13, then a certain amount of tap water is added into the thick chamber 12, the first fresh water inlet valve 1041, the first fresh water outlet valve 1121, the first concentrated water inlet valve 1071 and the first thick chamber outlet valve 1221 are opened, the second fresh water inlet valve 1042, the second fresh water outlet valve 1122, the second concentrated water inlet valve 1072 and the second thick chamber outlet valve 1222 are closed, waste water enters the thin water tank 102 after passing through the fresh water filter 101, when the static pressure liquid level meter 602 corresponding to the thin water tank 102 reaches the upper limit of the liquid level setting, water inlet is stopped, the waste water enters the heat exchanger 104 after being lifted by the fresh water circulating pump 103 for heat exchange, then enters the thin chamber 11, the thick chamber 12, the pole chamber 13 and the thin chamber 11 of the device can be circulated and diluted under the action of an anion exchange membrane and a cation exchange membrane, and in the operation process, the water tank 102, the thick water tank 105, the pole water tank 108 and the cleaning tank 402 add acid according to the value of the pH measuring instrument 603, when the value of the conductivity sensor 608 of the concentration chamber reaches a preset value, polar water is sent into the polar water buffer tank 201 by polar water circulation, the process is completed by setting the discharge time to be 1 min, then, concentrated water is supplemented to the static pressure liquid level meter corresponding to the polar water tank 108 by the concentrated water circulation to set a supplement liquid level value, and after the process is completed, the residual concentrated water in the concentrated water tank 105 is discharged to the set lower limit value of the static pressure liquid level meter 602 arranged on the concentrated water tank 105; then, pumping the polar water in the polar water cache tank 201 into the concentrated water tank 105 under the action of gravity, and then supplementing tap water to the concentrated water tank 105 until the polar water reaches a set value corresponding to the static pressure liquid level meter 602; after 4-12h, performing polarity inversion, closing the fresh water first water inlet valve 1041, the fresh water first water outlet valve 1121, the concentrated water first water inlet valve 1071 and the concentrated chamber first water outlet valve 1221, and opening the fresh water second water inlet valve 1042, the fresh water second water outlet valve 1122, the concentrated water second water inlet valve 1072 and the concentrated chamber second water outlet valve 1222 to circulate the fresh water into the concentrated chamber 12 and circulate the concentrated water into the fresh chamber 11; when the pressure sensor 606 detects that the difference between the inlet water pressure and the outlet water pressure of the diluting chamber 11 and the concentrating chamber 12 reaches a preset upper limit value, the inlet valve 301 and the outlet valve 302 are opened to flush and clean the membrane stack.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. An automatically controlled electrodialysis system, comprising: comprises a desalination circulation unit, a concentrated water-polar water circulation unit, a flushing unit, a cleaning unit, an acid adding unit, an instrument and an automatic control unit; wherein:
the desalination circulation unit comprises an electrodialysis membrane stack (100), a fresh water circulation pipeline, a concentrated water circulation pipeline and an electrode water circulation pipeline, wherein the electrodialysis membrane stack (100) comprises a dilute chamber (11), a concentrated chamber (12) and an electrode chamber (13); the fresh water circulating pipeline comprises: the water outlet of the fresh water filter (101) is connected with a first fresh water tank water inlet (1021) of a fresh water tank (102), the water outlet of the fresh water tank (102) is divided into two branches after sequentially passing through a fresh water circulating pump (103) and a heat exchanger (104), one branch is connected with a first fresh water chamber water inlet (1101) of a fresh water chamber (11) through a fresh water first water inlet valve (1041), the other branch is connected with a first thick chamber water inlet (1201) through a fresh water second water inlet valve (1042), the first fresh water chamber water outlet (1102) is divided into two branches, one branch is connected with a second fresh water tank water inlet (1022) through a first fresh water chamber water outlet valve (1121), and the other branch is connected with a first thick water tank water inlet (1051) through a second fresh water outlet valve (1122); the concentrated water circulating pipeline comprises: a water outlet of the concentrated water tank (105) is divided into two branches after sequentially passing through a concentrated water circulating pump (106) and a concentrated water filter (107), one branch is connected with a first water inlet (1201) of a concentrated chamber (12) through a first concentrated water inlet valve (1071), the other branch is connected with a first water inlet (1101) of a dilute chamber through a second concentrated water inlet valve (1072), the first water outlet (1202) of the concentrated chamber is divided into two branches, one branch is connected with a first water inlet (1051) of the concentrated water tank through a first concentrated chamber water outlet valve (1221), and the other branch is connected with a second water inlet (1022) of the dilute water tank through a second concentrated chamber water outlet valve (1222); the polar water circulation pipeline comprises: a water outlet of the polar water tank (108) is connected with a first polar chamber water inlet (1301) of the polar chamber (13) after sequentially passing through the polar water circulating pump (109), the polar water filter (110) and the polar water heat exchanger (111), and a first polar chamber water outlet (1302) is connected with a first polar water tank water inlet (1081);
dense water-utmost point water circulation unit includes utmost point water buffer tank (201), and the circulating line is: a second water outlet (1303) of the polar chamber is connected with a water inlet of the polar water cache tank (201), a second water outlet (1203) of the concentration chamber is connected with a second water inlet (1082) of the polar water tank, and a water outlet of the polar water cache tank (201) is connected with a second water inlet (1052) of the concentrated water tank;
the flushing unit comprises a water inlet valve (301) and a water outlet valve (302), and the circulating pipeline comprises: the water inlet pipeline is connected with the flushing water inlets of the diluting chamber (11), the concentrating chamber (12) and the polar chamber (13) after passing through the water inlet valve (301), and the water outlets of the diluting chamber (11), the concentrating chamber (12) and the polar chamber (13) are connected with the water outlet pipeline after passing through the water outlet valve (302);
the cleaning unit comprises a cleaning pump (401), a cleaning tank (402) and a cleaning filter (403), and a water outlet of the cleaning tank (402) is connected with the water inlet pipeline after passing through the cleaning pump (401) and the cleaning filter (403);
the acid adding unit comprises a concentrated chamber acid box (501), a polar chamber acid box (502) and a dilute chamber acid box (503), wherein an acid outlet of the concentrated chamber acid box (501) is connected with an acid inlet of a concentrated water box (105) through a metering pump (504), an acid outlet of the polar chamber acid box (502) is connected with an acid inlet of a polar water box (108) through the metering pump (504), and an acid outlet of the dilute chamber acid box (503) is connected with an acid inlet of a dilute water box (102) through the metering pump (504);
the meter and automatic control unit comprises flow meters (601) arranged at a first water inlet (1021) of the fresh water tank, a water outlet of the fresh water chamber (11) and a water outlet of the thick chamber (12), static pressure liquid level meters (602) arranged on the fresh water tank (102), the thick water tank (105), the pole water tank (108) and the cleaning tank (402), pH measuring instruments (603) arranged on the fresh water tank (102), the thick water tank (105), the pole water tank (108) and the cleaning tank (402), rotor flow meters (604) arranged at a first water inlet (1101) of the fresh chamber, a first water inlet (1201) of the thick chamber and a first water inlet (1301) of the pole chamber, temperature sensors (605) arranged at the first water inlet (1101) of the fresh water chamber, the first water inlet (1201) of the thick chamber and the first water inlet (1301) of the pole chamber, and pressure sensors (606) arranged at the first water inlet (1101) of the fresh water chamber, the first water outlet (1102) of the thick chamber, the first water inlet (1201) of the thick chamber and the first water outlet, and conductivity sensors (608) provided at the water discharge port of the thin chamber (11) and the water discharge port of the thick chamber (12).
2. The automatically controlled electrodialysis system of claim 1, wherein: the device is also provided with a fan (202) and an alkali absorption box (203), wherein the air inlet of the fan (202) is connected with the atmosphere, and the air outlet is connected with the air inlet of the alkali absorption box (203) after passing through the polar water tank (108).
3. The automatically controlled electrodialysis system of claim 1, wherein: a back pressure valve is arranged at the outlet of the metering pump (504).
4. A method of using an automatically controlled electrodialysis system according to any of claims 1 to 3, wherein: the method comprises the following steps:
adding a sodium chloride solution with the mass fraction of 3% into the polar chamber (13), and adding water into the concentration chamber (12);
opening a fresh water first water inlet valve (1041), a fresh water first water outlet valve (1121), a concentrated water first water inlet valve (1071) and a concentrated chamber first water outlet valve (1221), and closing a fresh water second water inlet valve (1042), a fresh chamber second water outlet valve (1122), a concentrated water second water inlet valve (1072) and a concentrated chamber second water outlet valve (1222);
adding wastewater, wherein the wastewater enters a fresh water tank (102) after passing through a fresh water filter (101), stopping water inlet when a static pressure liquid level meter (602) on the fresh water tank (102) reaches a preset liquid level, and the wastewater enters a heat exchanger (104) for heat exchange after being lifted by a fresh water circulating pump (103) and then enters a fresh water chamber (11);
in the operation process, the fresh water tank (102), the concentrated water tank (150), the polar water tank (108) and the cleaning tank (402) are added with acid according to the respectively arranged pH measuring instruments (603) until the pH value reaches the preset value;
in the operation process, when the measured value of the concentration chamber conductivity sensor (608) reaches a preset value, sending the polar water of the polar chamber (13) into the polar water buffer tank (201), supplementing the concentrated water of the concentration chamber (12) into the polar water tank (108) until reaching a supplement level value preset by a static pressure liquid level meter (602) arranged on the polar water tank (108), and then discharging the residual concentrated water of the concentrated water tank (105) until reaching a lower limit value preset by the static pressure liquid level meter (602) arranged on the concentrated water tank (105);
adding the polar water in the polar water buffer tank (201) into a concentrated water tank (105), and then supplementing water to the concentrated water tank (105) until a static pressure liquid level meter (602) arranged on the concentrated water tank (105) reaches a preset value;
after 4-12h, performing polarity inversion, closing the first fresh water inlet valve (1041), the first fresh water outlet valve (1121), the first concentrated water inlet valve (1071) and the first concentrated chamber outlet valve (1221), and opening the second fresh water inlet valve (1042), the second fresh water outlet valve (1122), the second concentrated water inlet valve (1072) and the second concentrated chamber outlet valve (1222), so that fresh water enters the concentrated chamber (12) for circulation, and concentrated water enters the fresh chamber (11) for circulation;
when the pressure sensor (606) detects that the pressure difference between the inlet water and the outlet water of the dilute chamber (11) and the concentrated chamber (12) reaches a preset upper limit value, the inlet valve (301) and the outlet valve (302) are opened to flush and clean the membrane stack.
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| CN202110607043.6A CN113428947A (en) | 2021-06-01 | 2021-06-01 | Automatic control electrodialysis system and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716660A (en) * | 2021-09-29 | 2021-11-30 | 内蒙古蒙一环保科技有限责任公司 | Modularization intelligent control electric membrane method desalination device |
| CN115072897A (en) * | 2022-05-31 | 2022-09-20 | 光大环保技术研究院（南京）有限公司 | Electrodialysis membrane pollution prevention and treatment method and electrodialyzer |
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2021
- 2021-06-01 CN CN202110607043.6A patent/CN113428947A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113716660A (en) * | 2021-09-29 | 2021-11-30 | 内蒙古蒙一环保科技有限责任公司 | Modularization intelligent control electric membrane method desalination device |
| CN115072897A (en) * | 2022-05-31 | 2022-09-20 | 光大环保技术研究院（南京）有限公司 | Electrodialysis membrane pollution prevention and treatment method and electrodialyzer |
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