CN114890510A - Sewage treatment device capable of simultaneously filtering and backwashing and sewage treatment method - Google Patents

Abstract

The present invention is a sewage treatment device and a sewage treatment method capable of filtering and backwashing at the same time. The sewage treatment device capable of filtering and backwashing at the same time comprises: an electric flocculation reactor and at least one component group, and the component group is in the electric flocculation reactor. , including a first membrane assembly, a second membrane assembly and an anode electrode, the first and second membrane assemblies are oppositely arranged on both sides of the corresponding anode electrode; a power supply device and at least one switch, the switch and the component group are arranged in a one-to-one correspondence, power supply The positive electrode of the device is electrically connected to the anode electrode, and the switch controls the negative electrode of the power supply device to be electrically connected to the corresponding first membrane assembly or the corresponding second membrane assembly; the first suction device, the first suction device is connected to the first membrane through the first fluid communication pipe The components are connected, the first fluid communication pipe is provided with a first valve, the first suction device is communicated with the second membrane assembly through the second fluid communication pipe, and the second fluid communication pipe is provided with a second valve. The invention can perform filtration and backwashing at the same time, thereby improving the sewage treatment efficiency.

Description

A sewage treatment device and sewage treatment method capable of filtering and backwashing at the same time

technical field

The invention belongs to the technical field of water treatment, and particularly relates to a sewage treatment device and a sewage treatment method capable of filtering and backwashing at the same time.

Background technique

As an efficient water treatment technology, electroflocculation has been widely used in the field of sewage treatment. However, there are still some impurities in the electroflocculation product water that are difficult to remove by precipitation, and the membrane separation technology has a good treatment effect on suspended solids and organic pollutants. Therefore, the combination of electroflocculation and membrane separation units can effectively improve the quality of product water.

In the prior art, when membrane separation is used for sewage treatment, it is still necessary to stop the filtration process of electroflocculation and membrane separation to clean the membrane or replace the membrane module, which increases the treatment cost and reduces the sewage treatment efficiency.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems or at least partially solve the above-mentioned technical problems, the purpose of the present invention is to provide a sewage treatment device and sewage treatment method that can filter and backwash at the same time, which can simultaneously filter and backwash to improve the efficiency of sewage treatment .

In order to achieve the above object, the technical scheme adopted in the present invention is:

In a first aspect, the present disclosure provides a sewage treatment device that can simultaneously filter and backwash, the device comprising:

An electroflocculation reactor and at least one component group, the component group is placed in the electroflocculation reactor, the component group includes a first membrane module, a second membrane module and an anode electrode, the first membrane module and the The second membrane assemblies are relatively arranged on both sides of the corresponding anode electrodes;

A power supply device and at least one switch, the switch and the component group are arranged in a one-to-one correspondence, the positive electrode of the power supply device is electrically connected to the anode electrode, and the switch is used to control the negative electrode of the power supply device and the anode electrode. The corresponding first membrane assembly or the corresponding second membrane assembly is electrically connected;

a first suction device, the first suction device communicates with the first membrane assembly through a first fluid communication pipe, a first valve is provided on the first fluid communication pipe, the first suction device and It communicates with the second membrane assembly through a second fluid communication pipe, and the second fluid communication pipe is provided with a second valve.

Optionally, the sewage treatment device capable of filtering and backwashing at the same time also includes:

A liquid level monitoring device, the liquid level monitoring device is located in the electric flocculation reactor and is electrically connected with the switch, and the liquid level monitoring device is used to monitor the liquid level in the electric flocculation reactor to control the The switching of the selection end of the switch.

Optionally, at least one auxiliary anode electrode is disposed between the anode electrode and the corresponding first membrane assembly; and/or, at least one auxiliary anode electrode is disposed between the anode electrode and the corresponding second membrane assembly Auxiliary anode electrode.

Optionally, the sewage treatment device capable of filtering and backwashing at the same time also includes:

A water storage tank and a second suction device, the electro-flocculation reactor is communicated with the water storage tank through a third fluid communication pipe, the third fluid communication pipe is provided with the second suction device, the second The suction device is used for suctioning the sewage in the water storage tank into the electroflocculation reactor through the third fluid communication pipe.

Optionally, the sewage treatment device capable of filtering and backwashing at the same time also includes:

an ozone generator, which is communicated with the electro-flocculation reactor through a fourth fluid communication pipe, and the ozone generator is used for injecting ozone into the electro-flocculation reactor.

Optionally, the sewage treatment device capable of filtering and backwashing at the same time also includes:

A sludge discharge device, the sludge discharge device is communicated with the bottom of the electro-flocculation reactor through a third valve, and the sludge discharge device is used for discharging the sludge of the electro-flocculation reactor.

Optionally, the first membrane assembly includes a conductive film or includes a non-conductive film and a porous conductive material, and the second membrane assembly includes a conductive film or includes a non-conductive film and a porous conductive material.

Optionally, the distance between the first membrane assembly and the corresponding anode electrode is greater than or equal to 1 cm and less than or equal to 3 cm; the distance between the second membrane assembly and the corresponding anode electrode is greater than or equal to 1 cm and less than or equal to 1 cm. is equal to 3 cm.

In a second aspect, an embodiment of the present disclosure further provides a sewage treatment method. The sewage treatment method is performed by the sewage treatment device that can simultaneously filter and backwash as described in the first aspect, and the sewage treatment method includes:

Step 1, control the switch to control the negative electrode of the power supply device to be electrically connected to the corresponding first membrane assembly, control the first valve to close, and control the second valve to open; wherein, the first The membrane assembly is used as a cathode electrode, and the second membrane assembly is used as a filter assembly;

Step 2, control the switch to control the negative electrode of the power supply device to be electrically connected to the second membrane assembly, control the first valve to open, and control the second valve to close; wherein, the second membrane assembly As a cathode electrode, the first membrane assembly acts as a filter assembly;

The step 1 and the step 2 are executed cyclically.

Optionally, the set time interval controls the automatic switching of the switch and the automatic switching of the switch states of the first valve and the second valve; or,

According to the liquid level in the electro-flocculation reactor, the automatic switching of the switch and the automatic switching of the switching states of the first valve and the second valve are controlled.

The embodiment of the present disclosure discloses a sewage treatment device and a sewage treatment method that can filter and backwash at the same time. By setting an electro-flocculation reactor and at least one component group, the component group is placed in the electro-flocculation reactor, and the component group includes a first The membrane module, the second membrane module and the anode electrode, the first membrane module and the second membrane module are arranged on opposite sides of the corresponding anode electrode; the power supply device and at least one switch, the switch and the component group are arranged in one-to-one correspondence to supply power The positive electrode of the device is electrically connected to the anode electrode, and the switch is used to control the negative electrode of the power supply device to be electrically connected to the corresponding first membrane component or the corresponding second membrane component; the first suction device, the first suction device passes through the first fluid The communication pipe communicates with the first membrane assembly, the first fluid communication pipe is provided with a first valve, the first suction device is communicated with the second membrane assembly through the second fluid communication pipe, and the second fluid communication pipe is provided with a second valve. As a result, the integration of electro-flocculation and membrane separation is realized in one electro-flocculation reactor, which saves the floor space of the electro-flocculation reactor, saves manpower, improves the effluent quality, and alleviates the problem of membrane fouling. The replacement of the membrane module and the second membrane module, while one membrane module is filtering, the other membrane module is backwashing, which can perform sewage filtration and membrane cleaning at the same time, which solves the low processing efficiency and cost caused by membrane cleaning and replacement. It can realize the synchronization of filtration and backwashing, and improve the efficiency of sewage treatment.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the accompanying drawings that are required to be used in the description of the embodiments or the prior art will be briefly introduced below. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

1 is a schematic structural diagram of a sewage treatment device that can simultaneously filter and backwash according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a sewage treatment method that can simultaneously filter and backwash according to an embodiment of the present invention.

Detailed ways

In order to more clearly understand the above objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments may be combined with each other under the condition of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, and Not all examples.

FIG. 1 is a schematic structural diagram of a sewage treatment device that can filter and backwash at the same time according to an embodiment of the present disclosure. As shown in FIG. 1 , the sewage treatment device that can filter and backwash at the same time includes an electroflocculation reactor 1 and at least one component group 2 . FIG. 1 only exemplarily shows one component group 2 , and the component group 2 is placed in the electroflocculation reactor. In the reactor 1 , the component group 2 includes a first membrane module 21 , a second membrane module 22 and an anode electrode 23 .

The sewage treatment device that can filter and backwash at the same time also includes a power supply device 3 and at least one switch 4. The switch 4 is arranged in a one-to-one correspondence with the component group 2. Only one switch 4 is exemplarily shown in FIG. 1 . The changeover switch 4 shown at 1 is provided corresponding to the component group 2 shown in FIG. 1 . The positive electrode + of the power supply device 3 is electrically connected to the anode electrode 23 , and the switch 4 is used to control the negative electrode - of the power supply device 3 to be electrically connected to the corresponding first membrane assembly 21 or the corresponding second membrane assembly 22 .

The sewage treatment device that can filter and backwash at the same time also includes a first suction device 5, and the first suction device 5 communicates with the first membrane module 21 through a first fluid communication pipe 141, and the first fluid communication pipe 141 is provided with a first A valve 6, the first suction device 5 communicates with the second membrane assembly 22 through the second fluid communication pipe 142, and the second fluid communication pipe 142 is provided with a second valve 7.

Specifically, as shown in FIG. 1 , the first membrane module 21 , the second membrane module 22 and the anode electrode 23 are arranged in the electroflocculation reactor 1 as a set of component groups 2 , and the component groups 2 can be The size and the reaction rate of electroflocculation are set to one or more sets, and each set of component groups 2 includes a first membrane module 21, a second membrane module 22 and an anode electrode 23, the first membrane module 21 and the second The membrane assemblies 22 are oppositely disposed on both sides of the corresponding anode electrodes 23 .

The switch 4 is arranged in one-to-one correspondence with the component group 2 and has the same number. The positive electrode+ of the power supply device 3 is electrically connected to the anode electrode 23. By controlling the switch 4, the negative electrode of the power supply device 3 can be connected to the corresponding first film. The modules 21 or the corresponding second membrane modules 22 are electrically connected, so that the corresponding first membrane modules 21 or the corresponding second membrane modules 22 are used as cathode electrodes. Exemplarily, the switch 4 can be, for example, a single-pole, double-throw switch. By switching the selection end of the switch 4, the negative pole of the power supply device 3 can be electrically connected to the corresponding first membrane assembly 21 or the corresponding second membrane assembly 22. .

The first suction device 5 is communicated with the first membrane assembly 21 through the first fluid communication pipe 141. The first fluid communication pipe 141 is provided with a first valve 6. When the first membrane assembly 21 is used as a filter assembly, the first valve 6 is opened. The first membrane module 21 is controlled to communicate with the first suction device 5 to suck clean water into the clean water tank 13. When the first membrane module 21 is used as a cathode electrode, the first valve 6 is closed to control the first membrane module 21 and the first suction. The device 5 is disconnected; the first suction device 5 is communicated with the second membrane assembly 22 through the second fluid communication pipe 142, and the second fluid communication pipe 142 is provided with a second valve 7. When the second membrane assembly 22 is used as a filter assembly , open the second valve 7 to control the second membrane assembly 22 to communicate with the first suction device 5, suck clean water into the clean water tank 13, and close the second valve 7 to control the second membrane assembly when the second membrane assembly 22 is used as a cathode electrode 22 is disconnected from the first suction device 5 .

It should be noted that the anode electrode 23 can be selected from aluminum electrodes, iron electrodes, or aluminum-iron electrodes.

Specifically, the positive electrode+ of the power supply device 3 is electrically connected to the anode electrode 23, and the switch 4 controls the first membrane assembly 21 to be electrically connected to the negative electrode- of the power supply device 3. When the first membrane assembly 21 is used as the cathode electrode, the first fluid communication is closed. The first valve 6 on the pipe 141 opens the second valve 7 on the second fluid communication pipe 142, the first suction device 5 communicates with the second membrane assembly 22 through the second fluid communication pipe 142, so that the second membrane assembly 22 as a filter element. Turn on the power supply device 3 to provide voltage and current for the electro-flocculation reaction, the first membrane module 21 acts as a cathode electrode, and conducts the electro-flocculation reaction with the anode electrode 23, and the second membrane module 22 communicates with the first suction device 5 through the second fluid communication pipe 142 It is connected to filter the sewage and suck the clean water into the clean water tank 13 .

When the second membrane module 22 as a filter module is polluted by sewage to form a filter cake layer and needs to be cleaned, the positive electrode+ of the power supply device 3 is electrically connected to the anode electrode 23, and the switch 4 controls the negative electrode- of the power supply device 3 to correspond to the second membrane The assembly 22 is electrically connected, the second valve 7 on the second fluid communication pipe 142 is closed, the first valve 6 on the first fluid communication pipe 141 is opened, and the first suction device 5 communicates with the first membrane through the first fluid communication pipe 141 The modules 21 are connected, and the first membrane module 21 is used as a filter module. The power supply device 3 provides voltage and current for the electro-flocculation reaction, the second membrane module 22 acts as a cathode electrode, and performs an electro-flocculation reaction with the anode electrode 23. Since the second valve 7 is closed, the second membrane module 22, which is the cathode, is in the electro-flocculation reaction due to the closure of the second valve 7. The gas generated on the surface cannot diffuse into the atmosphere and accumulate on the surface of the second membrane module 22 . The accumulated gas causes the filter cake on the surface of the second membrane module 22 to fall off, thereby achieving the effect of cleaning the second membrane module 22 . When the first membrane assembly 21 as the filter assembly is polluted, the switch 4 controls the first membrane assembly 21 to be electrically connected to the negative electrode of the power supply device 3 as a cathode for cleaning, while the second membrane assembly 22 is used as a filter assembly for circulation. The specific operation It is not repeated here. By repeating the above steps, the first membrane assembly 21 and the second membrane assembly 22 can be cleaned cyclically.

The sewage treatment device that can simultaneously filter and backwash provided by the embodiment of the present disclosure includes an electroflocculation reactor 1 and at least one component group 2 . The component group 2 is placed in the electroflocculation reactor 1 , and the component group 2 includes a first membrane module 21 . , the second membrane module 22 and the anode electrode 23, the first membrane module 21 and the second membrane module 22 are arranged on opposite sides of the corresponding anode electrode 23; the power supply device 3 and at least one switch 4, the switch 4 and the component group 2 are set in one-to-one correspondence, the positive electrode + of the power supply device 3 is electrically connected to the anode electrode 23, and the switch 4 is used to control the negative electrode of the power supply device 3 to be electrically connected to the corresponding first membrane assembly 21 or the corresponding second membrane assembly 22; A suction device 5, the first suction device 5 communicates with the first membrane assembly 21 through a first fluid communication pipe 141, the first fluid communication pipe 141 is provided with a first valve 6, and the first suction device 5 passes through the second The fluid communication pipe 142 communicates with the second membrane assembly 22 , and the second valve 7 is provided on the second fluid communication pipe 142 . The process of electro-flocculation and membrane separation is realized in one electro-flocculation reactor 1, which saves the floor space of the electro-flocculation reactor 1, saves manpower, and improves the quality of the effluent. When the first membrane module 21 or When the second membrane module 22 is polluted, without disassembling the first membrane module 21 or the second membrane module 22, the first membrane module 21 and the second membrane module 22 are exchanged, and sewage filtration and membrane cleaning are carried out at the same time. Cleaning solves the problems of low treatment efficiency and high cost caused by membrane cleaning and replacement, and improves the efficiency of sewage treatment.

Optionally, as shown in FIG. 1 , the sewage treatment device that can filter and backwash at the same time also includes a liquid level monitoring device 8. The liquid level monitoring device 8 is located in the electric flocculation reactor 1 and is electrically connected to the switch 4. The liquid level monitoring device 8 is The monitoring device 8 is used to monitor the liquid level in the electroflocculation reactor 1 to control the switching of the selection end of the switch 4 .

Specifically, as shown in FIG. 1 , the liquid level monitoring device 8 is located in the electroflocculation reactor 1 and is electrically connected to the switch 4 . Exemplarily, the switch 4 controls the negative electrode of the power supply device 3 to be electrically connected to the first membrane assembly 21 When the first membrane module 21 is used as a cathode electrode, the first valve 6 on the first fluid communication pipe 141 is closed, and when the second membrane module 22 is used as a filter module, the second valve 7 on the second fluid communication pipe 142 is opened to make the second membrane The assembly 22 is in communication with the first suction device 5 . The second membrane module 22 is polluted during the sewage filtration process, and the pollutant filter cake formed on the surface of the second membrane module 22 causes the membrane flux of the second membrane module 22 to decrease, the liquid level in the electroflocculation reactor 1 rises, and the liquid level When the monitoring device 8 monitors that the liquid level rises to a certain height, it controls the selection end of the switch 4 to switch, the negative electrode of the power supply device 3 is electrically connected to the second membrane assembly 22, and the second valve 7 on the second fluid communication pipe 142 is closed, The second membrane module 22 is used as a cathode to generate air bubbles to clean the filter cake on the surface of the second membrane module 22. When the first membrane module 21 is used as a filter module, the first valve 6 on the first fluid communication pipe 141 is opened so that the first membrane module 21 is connected to the filter cake. The first suction device 5 is connected to perform filtration. Therefore, without disassembling the first membrane module 21 and the second membrane module 22, sewage filtration and membrane cleaning are performed at the same time, which improves the sewage treatment efficiency. The liquid level monitoring device 8 realizes the selection of the switch 4. The control of switching increases the degree of automation.

It should be noted that the liquid level monitored by the liquid level monitoring device 8 to be switched by the selection end of the switch 4 can be determined according to factors such as the size of the electroflocculation reactor 1 and the actual working scene, which is not limited in the embodiments of the present disclosure.

Optionally, at least one auxiliary anode electrode is disposed between the anode electrode 23 and the corresponding first membrane assembly 21 ; and/or at least one auxiliary anode electrode is disposed between the anode electrode 23 and the corresponding second membrane assembly 22 .

Specifically, at least one auxiliary anode electrode is provided between the anode electrode 23 and the corresponding first membrane assembly 21, and the auxiliary anode electrode is not electrically connected to the power supply device 3. When the first membrane assembly 21 is used as the cathode electrode, the electric flocculation The electric field polarization is used in the reactor 1, and the auxiliary anode electrode arranged between the anode electrode 23 and the corresponding first membrane module 21 can improve the reaction efficiency of electroflocculation between the anode electrode 23 and the first membrane module 21; the anode electrode 23 At least one auxiliary anode electrode is arranged between the corresponding second membrane module 22, and the auxiliary anode electrode is not electrically connected to the power supply device 3. When the second membrane module 22 is used as a cathode electrode, an electric field electrode is used in the electroflocculation reactor 1. The auxiliary anode electrode disposed between the anode electrode 23 and the corresponding second membrane module 22 can improve the reaction efficiency of electroflocculation between the anode electrode 23 and the second membrane module 22 .

It should be noted that at least one auxiliary anode electrode can be arranged between the anode electrode 23 and the corresponding first membrane module 21, and at least one auxiliary anode electrode is arranged between the anode electrode 23 and the corresponding second membrane module 22, It is also possible to only set at least one auxiliary anode electrode between the anode electrode 23 and the corresponding first membrane module 21, or only set at least one auxiliary anode electrode between the anode electrode 23 and the corresponding second membrane module 22. The number of anode electrodes is set according to the size of the electroflocculation reactor 1 and the electroflocculation reaction rate, which is not limited in the embodiment of the present disclosure.

Optionally, as shown in FIG. 1 , the sewage treatment device that can simultaneously filter and backwash further includes a water storage tank 9 and a second suction device 10 , and the electroflocculation reactor 1 communicates with the water storage tank 9 through a third fluid communication pipe 143 . The third fluid communication pipe 143 is provided with a second suction device 10 , and the second suction device 10 is used to suck the sewage in the water storage tank 9 into the electroflocculation reactor 1 through the third fluid communication pipe 143 .

Specifically, as shown in FIG. 1 , the sewage is stored in the water storage tank 9, and the electroflocculation reactor 1 is communicated with the water storage tank 9 through the third fluid communication pipe 143. When there is still space to store sewage in the reactor 1, the sewage in the water storage tank 9 is sucked into the electroflocculation reactor 1 through the second suction device 10 on the third fluid communication pipe 143 for sewage treatment. The sewage in the water storage tank 9 may be added to the water storage tank 9 by the staff, or the sewage may be injected into the water storage tank 9 by other automatic water injection devices, which are not limited in the embodiment of the present disclosure.

Optionally, as shown in FIG. 1 , the sewage treatment device that can filter and backwash at the same time further includes an ozone generator 11. The ozone generator 11 communicates with the electroflocculation reactor 1 through a fourth fluid communication pipe 144. The ozone generator 11 Used to inject ozone into the electroflocculation reactor 1 .

Specifically, as shown in FIG. 1, the ozone generator 11 is communicated with the electroflocculation reactor 1 through the fourth fluid communication pipe 144. The ozone generator 11 is a device for producing ozone gas. Ozone is easily decomposed and cannot be stored. Produced for on-site use. When the electro-flocculation reaction is carried out in the electro-flocculation reactor 1, the ozone generator 11 injects ozone into the electro-flocculation reactor 1. As a strong oxidant, ozone can degrade the organic pollutants in the sewage that are difficult to be destroyed by general oxidants, and the reaction is safe. In addition, the time is short, and the use of the ozone generated by the ozone generator 11 to treat the sewage can improve the removal efficiency of pollutants and alleviate the pollution of the filter membrane. The concentration of ozone in the ozone generator 11 and the flow rate of ozone gas delivered by the ozone generator 11 into the electroflocculation reactor 1 are not limited in the embodiments of the present disclosure.

Optionally, as shown in FIG. 1 , the sewage treatment device that can filter and backwash at the same time also includes a sludge discharge device. The sludge discharge device is communicated with the bottom 12 of the electroflocculation reactor through a third valve, and the sludge discharge device is used to The sludge of the electroflocculation reactor 1 is discharged.

Specifically, as shown in FIG. 1 , the sludge discharge device is communicated with the bottom 12 of the electro-flocculation reactor through a third valve. Exemplarily, the bottom 12 of the electro-flocculation reactor is set in the shape of a funnel, and after performing multiple electro-flocculation and filtration After the sewage treatment of sewage, a large amount of sludge is deposited on the bottom 12 of the electroflocculation reactor. When the sludge needs to be discharged, the third valve is opened, and the sludge in the electroflocculation reactor 1 is discharged through the sludge discharge device, and the sludge is discharged. Then close the third valve 15.

Optionally, the first membrane assembly 21 includes a conductive film or includes a non-conductive film and a porous conductive material, and the second membrane assembly 22 includes a conductive film or includes a non-conductive film and a porous conductive material.

Specifically, the first membrane module 21 includes a conductive membrane or a non-conductive membrane and a porous conductive material, so that the first membrane module 21 has dual functions of electron transfer and filtration. Exemplarily, the first membrane assembly 21 can be composed of a non-conductive membrane, a porous conductive material and a fixing device, a PTFE (Poly tetra fluoroethylene, polytetrafluoroethylene) membrane can be used as the non-conductive membrane, and a stainless steel mesh can be used as the porous conductive material. The non-conductive membrane and the porous material are fixed by a fixing device; the first membrane component 21 can also be composed of a conductive membrane and a fixing device, and the conductive membrane can be one of an inorganic conductive membrane, an organic conductive membrane or an organic-inorganic composite conductive membrane, The fixing device fixes the conductive film. The second membrane assembly 22 can be set with reference to the first membrane assembly 21 , and details are not described here.

Optionally, the distance between the first membrane assembly 21 and the corresponding anode electrode 23 is greater than or equal to 1 cm and less than or equal to 3 cm; the distance between the second membrane assembly 22 and the corresponding anode electrode 23 is greater than or equal to 1 cm and less than or equal to 3 cm.

Exemplarily, the distance between the first membrane assembly 21 and the corresponding anode electrode 23 can be set to be greater than or equal to 1 cm and less than or equal to 3 cm; the distance between the second membrane assembly 22 and the corresponding anode electrode 23 can be set to be greater than or equal to 1 cm and less than or equal to 3 cm. Equal to 3 cm, setting the distance between the first membrane module 21 and the corresponding anode electrode 23 is related to the size of the electroflocculation reactor 1, the type of sewage to be treated, and the actual electroflocculation reaction rate. The distance between the first membrane module 21 and the corresponding anode electrode 23 and the distance between the second membrane module 22 and the corresponding anode electrode 23 are set to be greater than or equal to 1 cm, to ensure that the first membrane module 21 and the corresponding anode electrode 23 and the second membrane module There is sewage between the two membrane modules 22 and the corresponding anode electrodes 23 and the electro-flocculation reaction is carried out; the distance between the first membrane module 21 and the corresponding anode electrode 23 and the distance between the second membrane module 22 and the corresponding anode electrode 23 are set Less than or equal to 3 cm, the reaction rate of electroflocculation can be improved.

An embodiment of the present disclosure further provides a water treatment method, and FIG. 2 is a schematic flowchart of a sewage treatment method provided by an embodiment of the present disclosure. The sewage treatment method can be applied to a scenario where sewage needs to be treated, and can be executed by the sewage treatment device that can simultaneously filter and backwash provided by the embodiment of the present disclosure. The sewage treatment device that can simultaneously filter and backwash can use software and/or or hardware. As shown in Figure 2, the sewage treatment method includes:

S201, control the switch to control the negative electrode of the power supply device to be electrically connected to the corresponding first membrane assembly, control the first valve 6 to close, and control the second valve 7 to open; wherein, the first membrane assembly is used as a cathode electrode, and the second membrane assembly is used as a filter component.

Specifically, the switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected to the corresponding first membrane assembly 21, the first valve 6 is controlled to be closed, and the first membrane assembly 21 acts as the cathode electrode of the electro-flocculation reaction to undergo a reduction reaction, and through electrolysis The water produces hydrogen, which will overflow and float with the flocs in the sewage in the form of tiny bubbles. The anode electrode 23 undergoes an oxidation reaction, and the metal ions generated on the anode electrode 23 are combined with the hydroxide ions generated by the dissociation of the aqueous solution to form hydroxide alternately. , can flocculate with organic and inorganic impurities in water. When the second membrane module 22 is used as a filter module, the second valve 7 is opened, and the clean water is sucked into the clean water tank 13 through the first suction device 5 .

S202, control the switch to control the negative electrode of the power supply device to be electrically connected to the second membrane assembly, control the first valve 6 to open, and control the second valve 7 to close; wherein, the second membrane assembly 22 is used as a cathode electrode, and the first membrane assembly 21 is used as a filter component.

Specifically, when the second membrane module 22 serving as the filter module is polluted by sewage to form a filter cake layer and the membrane flux of the second membrane module 22 decreases, the switch 4 is controlled to control the negative electrode of the power supply device 3 and the second membrane module 22 Electrical connection, control the second valve 7 to close, the second membrane module 22 acts as the cathode electrode of the electro-flocculation reaction and undergoes a reduction reaction to generate hydrogen by electrolyzing water, and the hydrogen cleans the membrane surface filter cake layer of the second membrane module 22. The first membrane module 21 is used as a filter module, the first valve 6 is opened, and the clean water is sucked into the clean water tank 13 through the first suction device 5 .

By repeating the above steps S201 and S202, the first membrane assembly 21 and the second membrane assembly 22 can be cyclically cleaned. The reaction time of the entire sewage treatment is generally 20-60 minutes.

Optionally, the interval setting time controls the automatic switching of the switch 4 and the automatic switching of the switch states of the first valve 6 and the second valve 7; or,

According to the liquid level in the electro-flocculation reactor 1, the automatic switching of the switch 4 and the automatic switching of the switching states of the first valve 6 and the second valve 7 are controlled.

Specifically, according to the actual sewage treatment situation, the interval setting time can be set to control the automatic switching of the switch 4 and the automatic switching of the switch states of the first valve 6 and the second valve 7. For example, the automatic switching of the switch 4 can be manually controlled by human observation. .

Alternatively, the liquid level monitoring device 8 can also be used to monitor that when the liquid level in the electroflocculation reactor 1 reaches a certain height, the selection end of the switch 4 is controlled to switch, and the negative electrode of the power supply device 3 is electrically connected to the second membrane assembly 22. Connect, close the second valve 7 on the second fluid communication pipe 142, make the second membrane module 22 act as a cathode to generate air bubbles to clean the filter cake on the surface of the second membrane module 22, and open the first fluid when the first membrane module 21 is used as a filter module. The first valve 6 on the communication pipe 141 makes the first membrane module 21 communicate with the first suction device 5 for filtering. The liquid level monitoring device 8 controls the automatic switching of the switch 4 and the automatic switching of the switching states of the first valve 6 and the second valve 7 .

In a sewage treatment method provided by the embodiment of the present disclosure, the switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected to the corresponding first membrane module 21, the first valve 6 is controlled to close, and the second valve 7 is controlled to open; wherein, The first membrane assembly 21 is used as a cathode electrode, and the second membrane assembly 22 is used as a filter assembly; the switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected to the second membrane assembly 22, the first valve 6 is controlled to open, and the second valve 7 is controlled. Closed; wherein, the second membrane assembly 22 serves as a cathode electrode, and the first membrane assembly 21 serves as a filter assembly. Electroflocculation and membrane separation are realized in one electroflocculation reactor 1, and the operation can be controlled automatically, which saves the floor space of the electroflocculation reactor 1 and saves manpower. When the first membrane module 21 or When the second membrane module 22 is polluted, without disassembling the first membrane module 21 and the second membrane module 22, the first membrane module 21 and the second membrane module 22 are exchanged, and sewage filtration and membrane cleaning are carried out at the same time. Cleaning avoids the interference of traditional membrane cleaning on the filtration process, solves the problems of low treatment efficiency and high cost caused by membrane cleaning and replacement, and improves the efficiency of sewage treatment.

It should be noted that, in the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and are not necessarily required or implied Any such actual relationship or sequence exists between these entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined in this disclosure may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, the present disclosure is not to be limited to the described embodiments of this invention, but is to be accorded the widest scope consistent with the principles and novel features disclosed in this invention.

Claims (10)

1. a sewage treatment device that can simultaneously filter and backwash, is characterized in that, comprises: An electro-flocculation reactor (1) and at least one component group (2), the component group (2) being placed in the electro-flocculation reactor (1), the component group (2) comprising a first membrane module (21) ), a second membrane assembly (22) and an anode electrode (23), the first membrane assembly (21) and the second membrane assembly (22) are disposed opposite to the corresponding two sides of the anode electrode (23) ; A power supply device (3) and at least one switch (4), the switch (4) is provided in a one-to-one correspondence with the component group (2), the positive electrode of the power supply device (3) and the anode electrode (23) ) electrical connection, the switch (4) is used to control the negative electrode of the power supply device (3) to be electrically connected to the corresponding first membrane assembly (21) or the corresponding second membrane assembly (22); A first suction device (5), the first suction device (5) communicates with the first membrane assembly (21) through a first fluid communication pipe (141), the first fluid communication pipe (141) A first valve (6) is provided on the upper part, and the first suction device (5) is communicated with the second membrane assembly (22) through a second fluid communication pipe (142), and the second fluid communication pipe (142) ) is provided with a second valve (7). 2. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, characterized in that, further comprising: A liquid level monitoring device (8), the liquid level monitoring device (8) is located in the electroflocculation reactor (1) and is electrically connected to the switch (4), and the liquid level monitoring device (8) is used for The liquid level in the electro-flocculation reactor (1) is monitored to control the switching of the selection end of the switch (4). 3. The sewage treatment device capable of simultaneous filtration and backwashing according to claim 1, wherein at least one auxiliary anode is provided between the anode electrode (23) and the corresponding first membrane module (21). and/or, at least one auxiliary anode electrode is arranged between the anode electrode (23) and the corresponding second membrane assembly (22). 4. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, characterized in that, further comprising: A water storage tank (9) and a second suction device (10), the electroflocculation reactor (1) communicates with the water storage tank (9) through a third fluid communication pipe (143), the third fluid communication pipe The second suction device (10) is provided on the (143), and the second suction device (10) is used to remove the water in the water storage tank (9) through the third fluid communication pipe (143). Sewage is pumped into the electroflocculation reactor (1). 5. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, characterized in that, further comprising: An ozone generator (11) is communicated with the electroflocculation reactor (1) through a fourth fluid communication pipe (144), and the ozone generator (11) is used to supply the electrical Ozone is injected into the flocculation reactor (1). 6. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, further comprising: A sludge discharge device, the sludge discharge device communicates with the bottom of the electro-flocculation reactor (12) through a third valve, and the sludge discharge device is used to discharge the sludge of the electro-flocculation reactor (1). . 7. The sewage treatment device capable of filtering and backwashing at the same time according to claim 1, wherein the first membrane assembly (21) comprises a conductive film or a non-conductive film and a porous conductive material, and the second membrane assembly (21) 22) Include a conductive film or include a non-conductive film and a porous conductive material. 8. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, wherein the distance between the first membrane module (21) and the corresponding anode electrode (23) is greater than or equal to 1 cm, less than or equal to 1 cm. is equal to 3 centimeters; the distance between the second membrane assembly (22) and the corresponding anode electrode (23) is greater than or equal to 1 centimeter and less than or equal to 3 centimeters. 9. A sewage treatment method, characterized in that it is performed by the sewage treatment device capable of filtering and backwashing at the same time as claimed in any one of claims 1-8, the sewage treatment method comprising: Step 1, control the switch (4) to control the negative electrode of the power supply device (3) to be electrically connected to the corresponding first membrane assembly (21), control the first valve (6) to close, and control the The second valve (7) is opened; wherein, the first membrane assembly (21) is used as a cathode electrode, and the second membrane assembly (22) is used as a filter assembly; Step 2, control the switch (4) to control the negative electrode of the power supply device (3) to be electrically connected to the second membrane assembly (22), control the first valve (6) to open, and control the first valve (6) to open. Two valves (7) are closed; wherein, the second membrane assembly (22) serves as a cathode electrode, and the first membrane assembly (21) serves as a filter assembly; The step 1 and the step 2 are executed cyclically. 10. The sewage treatment method according to claim 9, characterized in that, the set time interval controls the automatic switching of the switch (4) and the control of the first valve (6) and the second valve (7) The switch state is automatically switched; or, According to the liquid level in the electro-flocculation reactor (1), the automatic switching of the switch (4) and the automatic switching of the switching states of the first valve (6) and the second valve (7) are controlled.

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