CN114890510A - Sewage treatment device capable of simultaneously filtering and backwashing and sewage treatment method - Google Patents
Sewage treatment device capable of simultaneously filtering and backwashing and sewage treatment method Download PDFInfo
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- CN114890510A CN114890510A CN202210632377.3A CN202210632377A CN114890510A CN 114890510 A CN114890510 A CN 114890510A CN 202210632377 A CN202210632377 A CN 202210632377A CN 114890510 A CN114890510 A CN 114890510A
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- 239000010865 sewage Substances 0.000 title claims abstract description 83
- 238000001914 filtration Methods 0.000 title claims abstract description 69
- 238000011001 backwashing Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000012528 membrane Substances 0.000 claims abstract description 239
- 239000012530 fluid Substances 0.000 claims abstract description 56
- 238000004891 communication Methods 0.000 claims abstract description 40
- 238000009297 electrocoagulation Methods 0.000 claims abstract description 37
- 238000005189 flocculation Methods 0.000 claims description 51
- 230000016615 flocculation Effects 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 24
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 23
- 238000012806 monitoring device Methods 0.000 claims description 14
- 239000010802 sludge Substances 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000004065 wastewater treatment Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 32
- 238000006243 chemical reaction Methods 0.000 description 17
- 238000003860 storage Methods 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 8
- 238000000926 separation method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 239000012065 filter cake Substances 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 229910001220 stainless steel Inorganic materials 0.000 description 1
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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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a sewage treatment device and a sewage treatment method capable of filtering and backwashing simultaneously, wherein the sewage treatment device capable of filtering and backwashing simultaneously comprises: the device comprises an electrocoagulation reactor and at least one component group, wherein the component group is arranged in the electrocoagulation reactor and comprises a first membrane component, a second membrane component and an anode electrode, and the first membrane component and the second membrane component are oppositely arranged on two sides of the corresponding anode electrode; the power supply device and the at least one change-over switch are arranged in one-to-one correspondence with the component groups, the anode of the power supply device is electrically connected with the anode electrode, and the change-over switch controls the cathode of the power supply device to be electrically connected with the corresponding first membrane component or the corresponding second membrane component; the first suction device is communicated with the first membrane module through a first fluid communication pipe, a first valve is arranged on the first fluid communication pipe, the first suction device is communicated with the second membrane module through a second fluid communication pipe, and a second valve is arranged on the second fluid communication pipe. The invention can simultaneously carry out filtration and backwashing, thereby improving the sewage treatment efficiency.
Description
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 simultaneously.
Background
The electric flocculation is used as an efficient water treatment technology and widely applied to the field of sewage treatment. But some impurities still exist in the electric flocculation water production and are difficult to remove through precipitation, and the membrane separation technology has better treatment effect on suspended matters, organic pollutants and the like, so that the electric flocculation and the membrane separation unit are combined, and the water quality of the water production can be effectively improved.
In the prior art, when the membrane separation is used for sewage treatment, the membrane can be cleaned or the membrane component can be replaced only by stopping the electric flocculation and the filtration process of the membrane separation, so that the treatment cost is increased, and the sewage treatment efficiency is reduced.
Disclosure of Invention
In order to solve the above technical problems or at least partially solve the above technical problems, an object of the present invention is to provide a sewage treatment apparatus and a sewage treatment method capable of performing filtration and backwashing simultaneously, so as to improve sewage treatment efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the present disclosure provides a sewage treatment apparatus capable of simultaneous filtration and backwashing, the apparatus comprising:
the device comprises an electrocoagulation reactor and at least one component group, wherein the component group is arranged in the electrocoagulation reactor and comprises a first membrane component, a second membrane component and an anode electrode, and the first membrane component and the second membrane component are oppositely arranged on two sides of the corresponding anode electrode;
the power supply device and the at least one change-over switch are arranged in one-to-one correspondence with the component groups, the anode of the power supply device is electrically connected with the anode electrode, and the change-over switch is used for controlling the cathode of the power supply device to be electrically connected with the corresponding first membrane assembly or the corresponding second membrane assembly;
the first suction device is communicated with the first membrane module through a first fluid communication pipe, a first valve is arranged on the first fluid communication pipe, the first suction device is communicated with the second membrane module through a second fluid communication pipe, and a second valve is arranged on the second fluid communication pipe.
Optionally, the sewage treatment device capable of filtering and backwashing simultaneously further comprises:
the liquid level monitoring device is positioned in the electric flocculation reactor and is electrically connected with the change-over switch, and the liquid level monitoring device is used for monitoring the liquid level in the electric flocculation reactor so as to control the switching of the selection end of the change-over switch.
Optionally, at least one auxiliary anode electrode is arranged between the anode electrode and the corresponding first membrane assembly; and/or at least one auxiliary anode electrode is arranged between the anode electrode and the corresponding second membrane assembly.
Optionally, the sewage treatment device capable of filtering and backwashing simultaneously further comprises:
the device comprises a water storage tank and a second suction device, wherein the electric flocculation reactor is communicated with the water storage tank through a third fluid communicating pipe, the third fluid communicating pipe is provided with the second suction device, and the second suction device is used for sucking sewage in the water storage tank to the electric flocculation reactor through the third fluid communicating pipe.
Optionally, the sewage treatment device capable of filtering and backwashing simultaneously further comprises:
the ozone generator is communicated with the electric flocculation reactor through a fourth fluid communicating pipe and is used for injecting ozone into the electric flocculation reactor.
Optionally, the sewage treatment device capable of filtering and backwashing simultaneously further comprises:
the sludge discharge device is communicated with the bottom of the electric flocculation reactor through a third valve and is used for discharging sludge of the electric flocculation reactor.
Optionally, the first membrane assembly comprises a conductive membrane or a non-conductive membrane and a porous conductive material, and the second membrane assembly comprises a conductive membrane or a non-conductive membrane 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 more than or equal to 1 cm and less than or equal to 3 cm.
In a second aspect, embodiments of the present disclosure also provide a sewage treatment method, which is performed by the sewage treatment apparatus capable of filtering and backwashing simultaneously according to the first aspect, and includes:
step 1, controlling the change-over switch to control the negative electrode of the power supply device to be electrically connected with the corresponding first membrane assembly, controlling the first valve to be closed, and controlling the second valve to be opened; wherein the first membrane module is used as a cathode electrode, and the second membrane module is used as a filtering module;
and circularly executing the step 1 and the step 2.
Optionally, the interval setting time controls the automatic switching of the change-over switch and controls the automatic switching of the switch states of the first valve and the second valve; or,
and controlling the automatic switching of the switch and the automatic switching of the on-off states of the first valve and the second valve according to the liquid level height in the electric flocculation reactor.
The sewage treatment device and the sewage treatment method capable of filtering and backwashing simultaneously disclosed by the embodiment of the disclosure are characterized in that an electrocoagulation reactor and at least one component group are arranged, the component group is arranged in the electrocoagulation reactor, the component group comprises a first membrane component, a second membrane component and an anode electrode, and the first membrane component and the second membrane component are oppositely arranged on two sides of the corresponding anode electrode; the power supply device comprises a power supply device and at least one change-over switch, wherein the change-over switches and the component groups are arranged in a one-to-one correspondence manner, the anode of the power supply device is electrically connected with the anode electrode, and the change-over switch is used for controlling the cathode of the power supply device to be electrically connected with the corresponding first membrane component or the corresponding second membrane component; the first suction device is communicated with the first membrane module through a first fluid communication pipe, a first valve is arranged on the first fluid communication pipe, the first suction device is communicated with the second membrane module through a second fluid communication pipe, and a second valve is arranged on the second fluid communication pipe. Therefore, the integration of electric flocculation and membrane separation is realized in an electric flocculation reactor, the occupied area of the electric flocculation reactor is saved, the labor is saved, the effluent quality is improved, and the problem of membrane pollution is relieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a sewage treatment apparatus capable of filtering and backwashing simultaneously according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a sewage treatment method capable of filtering and backwashing simultaneously according to an embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a sewage treatment apparatus capable of filtering and backwashing simultaneously according to an embodiment of the present disclosure. As shown in fig. 1, the sewage treatment device capable of filtering and backwashing simultaneously comprises an electrocoagulation reactor 1 and at least one component group 2, wherein fig. 1 only exemplarily shows one component group 2, the component group 2 is arranged in the electrocoagulation reactor 1, the component group 2 comprises a first membrane module 21, a second membrane module 22 and an anode electrode 23, and the first membrane module 21 and the second membrane module 22 are oppositely arranged at two sides of the corresponding anode electrode 23.
The sewage treatment device capable of filtering and backwashing simultaneously further comprises a power supply device 3 and at least one change-over switch 4, wherein the change-over switches 4 are arranged corresponding to the component groups 2 one by one, only one change-over switch 4 is exemplarily shown in fig. 1, and the change-over switch 4 shown in fig. 1 is arranged 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 changeover switch 4 is used to control the negative electrode of the power supply device 3 to be electrically connected to the corresponding first membrane module 21 or the corresponding second membrane module 22.
The sewage treatment device capable of filtering and backwashing simultaneously further comprises a first suction device 5, wherein the first suction device 5 is communicated with the first membrane module 21 through a first fluid communication pipe 141, a first valve 6 is arranged on the first fluid communication pipe 141, the first suction device 5 is communicated with the second membrane module 22 through a second fluid communication pipe 142, and a second valve 7 is arranged on the second fluid communication pipe 142.
Specifically, as shown in fig. 1, a first membrane module 21, a second membrane module 22 and an anode electrode 23 are arranged in an electrocoagulation reactor 1 as a set of component groups 2, the component groups 2 can be arranged in one set or more sets according to the size of the electrocoagulation reactor 1 and the electrocoagulation reaction rate, each set of component group 2 comprises one first membrane module 21, one second membrane module 22 and one anode electrode 23, and the first membrane module 21 and the second membrane module 22 are oppositely arranged on two sides of the corresponding anode electrode 23.
The change-over switches 4 are provided in one-to-one correspondence with the component groups 2, and the same number of the change-over switches 4 is provided, and the positive electrode + of the power supply device 3 is electrically connected to the anode electrode 23, so that the negative electrode-of the power supply device 3 can be electrically connected to the corresponding first membrane module 21 or the corresponding second membrane module 22 by controlling the change-over switches 4, and the corresponding first membrane module 21 or the corresponding second membrane module 22 can be used as the cathode electrode. The switch 4 may be, for example, a single-pole double-throw switch, and the negative electrode of the power supply device 3 may be electrically connected to the corresponding first membrane module 21 or the corresponding second membrane module 22 by switching the selection terminal of the switch 4.
The first suction device 5 is communicated with the first membrane module 21 through a first fluid communication pipe 141, a first valve 6 is arranged on the first fluid communication pipe 141, when the first membrane module 21 serves as a filtering component, the first valve 6 is opened to control the first membrane module 21 to be communicated with the first suction device 5 so as to suck clean water into the clean water tank 13, and when the first membrane module 21 serves as a cathode electrode, the first valve 6 is closed to control the first membrane module 21 to be disconnected from the first suction device 5; the first pumping device 5 is communicated with the second membrane module 22 through a second fluid communication pipe 142, a second valve 7 is arranged on the second fluid communication pipe 142, when the second membrane module 22 is used as a filtering component, the second valve 7 is opened to control the second membrane module 22 to be communicated with the first pumping device 5, clean water is pumped into the clean water tank 13, and when the second membrane module 22 is used as a cathode electrode, the second valve 7 is closed to control the second membrane module 22 to be disconnected from the first pumping device 5.
It should be noted that the anode electrode 23 may be an aluminum electrode, an iron electrode, or an aluminum-iron electrode, and the specific shape and size of the anode electrode 23, the voltage and current provided by the power supply device 3, and the like, which are not limited in the embodiment of the present disclosure.
Specifically, the positive electrode + of the power supply device 3 is electrically connected to the anode electrode 23, the change-over switch 4 controls the first membrane module 21 to be electrically connected to the negative electrode of the power supply device 3, when the first membrane module 21 serves as the cathode electrode, the first valve 6 on the first fluid connection pipe 141 is closed, the second valve 7 on the second fluid connection pipe 142 is opened, and the first suction device 5 is connected to the second membrane module 22 through the second fluid connection pipe 142, so that the second membrane module 22 serves as the filter module. The power supply device 3 is opened to provide voltage and current for the electric flocculation reaction, the first membrane module 21 is used as a cathode electrode to perform the electric flocculation reaction with the anode electrode 23, and the second membrane module 22 is communicated with the first suction device 5 through the second fluid communication pipe 142 to filter the sewage and suck the clean water into the clean water tank 13.
When the second membrane module 22 as a filtering module is polluted by sewage to form a filter cake layer and needs to be cleaned, the anode + of the power supply device 3 is electrically connected with the anode electrode 23, the change-over switch 4 controls the cathode of the power supply device 3 to be electrically connected with the corresponding second membrane module 22, 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, the first suction device 5 is communicated with the first membrane module 21 through the first fluid communication pipe 141, and the first membrane module 21 serves as a filtering module. The power supply device 3 provides voltage and current for the electric flocculation reaction, the second membrane module 22 is used as a cathode electrode to perform the electric flocculation reaction with the anode electrode 23, and because the second valve 7 is closed, the second membrane module 22 used as a cathode can not diffuse gas generated on the surface by the electric flocculation reaction to the atmosphere and is gathered on the surface of the second membrane module 22, and the gathered gas enables a filter cake on the surface of the second membrane module 22 to fall off, so that the effect of cleaning the second membrane module 22 is achieved. When the first membrane module 21 as a filtering module is polluted, the switch 4 controls the first membrane module 21 to be electrically connected with the negative electrode of the power supply device 3 as a cathode for cleaning, and the second membrane module 22 is used as a filtering module for circulation, and the detailed operation is not described herein. The above steps are repeatedly circulated, and the first membrane module 21 and the second membrane module 22 can be circularly cleaned.
The sewage treatment device capable of filtering and backwashing simultaneously provided by the embodiment of the disclosure comprises an electrocoagulation reactor 1 and at least one component group 2, wherein the component group 2 is arranged in the electrocoagulation reactor 1, the component group 2 comprises a first membrane module 21, a second membrane module 22 and an anode electrode 23, and the first membrane module 21 and the second membrane module 22 are oppositely arranged on two sides of the corresponding anode electrode 23; the power supply device 3 and at least one change-over switch 4, the change-over switch 4 and the component group 2 are arranged in a one-to-one correspondence manner, the positive pole + of the power supply device 3 is electrically connected with the anode electrode 23, and the change-over switch 4 is used for controlling the negative pole of the power supply device 3 to be electrically connected with the corresponding first membrane component 21 or the corresponding second membrane component 22; the first suction device 5, the first suction device 5 is communicated with the first membrane module 21 through a first fluid communication pipe 141, a first valve 6 is arranged on the first fluid communication pipe 141, the first suction device 5 is communicated with the second membrane module 22 through a second fluid communication pipe 142, and a second valve 7 is arranged on the second fluid communication pipe 142. The process of electric flocculation and membrane separation is realized in one electric flocculation reactor 1, the floor area of the electric flocculation reactor 1 is saved, the labor is saved, the effluent quality is improved, when the first membrane module 21 or the second membrane module 22 serving as a filtering component is polluted, under the condition that the first membrane module 21 or the second membrane module 22 is not detached, the sewage filtration and the membrane cleaning are simultaneously carried out through the switching of the first membrane module 21 and the second membrane module 22, the problems of low treatment efficiency and high cost caused by membrane cleaning and replacement are solved, and the sewage treatment efficiency is improved.
Optionally, as shown in fig. 1, the sewage treatment device capable of filtering and backwashing simultaneously further comprises a liquid level monitoring device 8, the liquid level monitoring device 8 is located in the electrocoagulation reactor 1 and electrically connected with the switch 4, and the liquid level monitoring device 8 is used for monitoring the liquid level in the electrocoagulation 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 electrocoagulation reactor 1 and electrically connected to the switch 4, for example, the switch 4 controls the negative electrode of the power supply device 3 to be electrically connected to the first membrane module 21, when the first membrane module 21 is used as a cathode electrode, the first valve 6 on the first fluid connection pipe 141 is closed, and when the second membrane module 22 is used as a filtering module, the second valve 7 on the second fluid connection pipe 142 is opened, so that the second membrane module 22 is connected to the first suction device 5. The second membrane module 22 is polluted in the sewage filtering process, the membrane flux of the second membrane module 22 is reduced due to pollutant filter cakes generated on the surface of the second membrane module 22, the liquid level in the electrocoagulation reactor 1 rises, when the liquid level monitoring device 8 monitors that the liquid level rises to a certain height, the selection end of the change-over switch 4 is controlled to be changed over, the negative electrode of the power supply device 3 is electrically connected with the second membrane module 22, the second valve 7 on the second fluid communicating pipe 142 is closed, bubbles are generated by using the second membrane module 22 as a cathode to clean the filter cakes on the surface of the second membrane module 22, and when the first membrane module 21 is used as a filtering module, the first valve 6 on the first fluid communicating pipe 141 is opened to communicate the first membrane module 21 with the first suction device 5 for filtering. Therefore, under the condition that the first membrane module 21 and the second membrane module 22 are not disassembled, sewage filtration and membrane cleaning are simultaneously carried out, the sewage treatment efficiency is improved, the liquid level monitoring device 8 realizes the control of the switching of the selection end of the selector switch 4, and the automation degree is improved.
It should be noted that the liquid level height that the liquid level monitoring device 8 monitors that the selection end of the selector switch 4 needs to be switched can be determined according to the size of the electrocoagulation reactor 1, the actual working scene and other factors, which is not limited in the embodiment of the disclosure.
Optionally, at least one auxiliary anode electrode is arranged 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.
Specifically, at least one auxiliary anode electrode is arranged between the anode electrode 23 and the corresponding first membrane module 21, the auxiliary anode electrode is not electrically connected with the power supply device 3, when the first membrane module 21 is used as a cathode electrode, the electric field polarization effect is utilized in the electrocoagulation 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 the electrocoagulation between the anode electrode 23 and the first membrane module 21; at least one auxiliary anode electrode is arranged between the anode electrode 23 and the corresponding second membrane module 22, the auxiliary anode electrode is not electrically connected with the power supply device 3, when the second membrane module 22 is used as a cathode electrode, the electric field polarization effect is utilized in the electric flocculation reactor 1, and the auxiliary anode electrode arranged between the anode electrode 23 and the corresponding second membrane module 22 can improve the reaction efficiency of electric flocculation between the anode electrode 23 and the second membrane module 22.
It should be noted that at least one auxiliary anode electrode may be disposed between the anode electrode 23 and the corresponding first membrane module 21, and at least one auxiliary anode electrode is disposed between the anode electrode 23 and the corresponding second membrane module 22, or at least one auxiliary anode electrode may be disposed only between the anode electrode 23 and the corresponding first membrane module 21, or at least one auxiliary anode electrode may be disposed only between the anode electrode 23 and the corresponding second membrane module 22, and the number of the auxiliary anode electrodes is set according to the size of the electrocoagulation reactor 1 and the electrocoagulation reaction rate, which is not limited in the embodiment of the present disclosure.
Optionally, as shown in fig. 1, the sewage treatment apparatus capable of filtering and backwashing simultaneously further comprises a water storage tank 9 and a second suction device 10, the electrocoagulation reactor 1 is communicated with the water storage tank 9 through a third fluid communication pipe 143, the third fluid communication pipe 143 is provided with the second suction device 10, and the second suction device 10 is used for sucking the sewage in the water storage tank 9 into the electrocoagulation reactor 1 through the third fluid communication pipe 143.
Specifically, as shown in fig. 1, sewage is stored in the water storage tank 9, the electric flocculation reactor 1 is communicated with the water storage tank 9 through the third fluid communication pipe 143, and when the sewage needs to be treated in the electric flocculation and membrane separation processes and there is still space in the electric flocculation reactor 1 to store the sewage, the sewage in the water storage tank 9 is sucked into the electric flocculation reactor 1 through the second suction device 10 on the third fluid communication pipe 143 to treat the sewage. The sewage in the water storage 9 can be added into the water storage 9 by a worker, and the sewage can also be injected into the water storage 9 by other automatic water injection devices, which is not limited in the embodiment of the disclosure.
Optionally, as shown in fig. 1, the sewage treatment apparatus capable of filtering and backwashing simultaneously further comprises an ozone generator 11, the ozone generator 11 is communicated with the electric flocculation reactor 1 through a fourth fluid communication pipe 144, and the ozone generator 11 is used for injecting ozone into the electric flocculation reactor 1.
Specifically, as shown in fig. 1, the ozone generator 11 is connected to the electrocoagulation reactor 1 through a fourth fluid connection pipe 144, and the ozone generator 11 is a device for producing ozone gas, and ozone is easy to decompose and cannot be stored, and needs to be produced on site and used on site. When the electric flocculation reaction is carried out in the electric flocculation reactor 1, the ozone generator 11 injects ozone into the electric flocculation reactor 1, the ozone is used as a strong oxidant to degrade organic pollutants which are difficult to damage by common oxidants in sewage, the reaction is safe and short in time, and the ozone generated by the ozone generator 11 is used for treating the sewage, so that the pollutant removal efficiency can be improved, and the pollution of a filtering membrane is relieved. The concentration of ozone in the ozone generator 11 and the flow rate of the ozone gas delivered by the ozone generator 11 into the electrocoagulation reactor 1 are not limited in the embodiments of the present disclosure.
Optionally, as shown in fig. 1, the sewage treatment device capable of filtering and backwashing simultaneously further comprises a sludge discharge device which is communicated with the bottom 12 of the electric flocculation reactor through a third valve and is used for discharging the sludge of the electric flocculation reactor 1.
Specifically, as shown in fig. 1, the sludge discharge device is communicated with the bottom 12 of the electrocoagulation reactor through a third valve, and illustratively, the bottom 12 of the electrocoagulation reactor is set to be funnel-shaped, after the sewage treatment for performing the electrocoagulation and filtering the sewage for a plurality of times, a large amount of sludge is deposited on the bottom 12 of the electrocoagulation reactor, when the sludge needs to be discharged, the third valve is opened, the sludge in the electrocoagulation reactor 1 is discharged through the sludge discharge device, and the third valve 15 is closed after the sludge is discharged.
Alternatively, the first membrane module 21 includes a conductive membrane or a non-conductive membrane and a porous conductive material, and the second membrane module 22 includes a conductive membrane or a non-conductive membrane and a porous conductive material.
Specifically, the first membrane module 21 includes a conductive membrane or includes a non-conductive membrane and a porous conductive material, so that the first membrane module 21 has dual functions of transferring electrons and filtering. Illustratively, the first membrane module 21 may be composed of a non-conductive membrane, a porous conductive material and a fixing device, a PTFE (polytetrafluoroethylene) membrane may be used as the non-conductive membrane, a stainless steel mesh may be used as the porous conductive material, and the fixing device is used to fix the non-conductive membrane and the porous material; the first film assembly 21 may also be composed of a conductive film, which may be one of an inorganic conductive film, an organic conductive film, or an organic-inorganic composite conductive film, and a fixing device that fixes the conductive film. The second membrane module 22 may be disposed with reference to the first membrane module 21, which will not be described in detail herein.
Optionally, the distance between the first membrane module 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 module 22 and the corresponding anode electrode 23 is not less than 1 cm and not more than 3 cm.
For example, the distance between the first membrane module 21 and the corresponding anode electrode 23 may 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 module 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, and the distance between the first membrane module 21 and the corresponding anode electrode 23 is set to be related to the size of the electrocoagulation reactor 1, the type of sewage to be treated and the actual electrocoagulation reaction rate. Setting 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 to be greater than or equal to 1 cm, so as to ensure that sewage can exist between the first membrane module 21 and the corresponding anode electrode 23 and between the second membrane module 22 and the corresponding anode electrode 23, and performing an electric flocculation reaction; 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 less than or equal to 3 cm, so that the reaction rate of the electroflocculation can be improved.
The embodiment of the disclosure also provides a water treatment method, and fig. 2 is a flow schematic diagram of the sewage treatment method provided by the embodiment of the disclosure. The sewage treatment method can be applied to the scene that sewage needs to be treated, and can be executed by the sewage treatment device capable of filtering and backwashing simultaneously provided by the embodiment of the disclosure, and the sewage treatment device capable of filtering and backwashing simultaneously can be realized in a software and/or hardware mode. As shown in fig. 2, the sewage treatment method includes:
s201, controlling a change-over switch to control the negative electrode of the power supply device to be electrically connected with the corresponding first membrane assembly, controlling the first valve 6 to be closed, and controlling the second valve 7 to be opened; the first membrane assembly is used as a cathode electrode, and the second membrane assembly is used as a filtering assembly.
Specifically, the change-over switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected with the corresponding first membrane module 21, the first valve 6 is controlled to be closed, the first membrane module 21 is used as a cathode electrode of the electric flocculation reaction to generate a reduction reaction, hydrogen is generated by electrolyzing water and overflows in the form of micro bubbles to carry floccules in sewage to float upwards, the anode electrode 23 generates an oxidation reaction, and metal ions generated on the anode electrode 23 are combined with hydroxyl ions generated by dissociation of an aqueous solution to generate hydroxide which is alternately capable of generating flocculation reaction with organic and inorganic impurities in water. When the second membrane module 22 is used as a filtering module, the second valve 7 is opened, and clean water is pumped into the clean water tank 13 through the first pumping device 5.
S202, controlling a change-over switch to control the negative electrode of the power supply device to be electrically connected with the second membrane component, controlling the first valve 6 to be opened, and controlling the second valve 7 to be closed; wherein the second membrane module 22 is used as a cathode electrode, and the first membrane module 21 is used as a filtering module.
Specifically, when the second membrane module 22 as the filtration module is polluted by sewage to form a cake layer, which results in a decrease in the membrane flux of the second membrane module 22, the change-over switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected with the second membrane module 22, the second valve 7 is controlled to be closed, the second membrane module 22 is used as the cathode electrode of the electrocoagulation reaction to perform a reduction reaction, hydrogen is generated by electrolyzing water, and the cake layer on the membrane surface of the second membrane module 22 is cleaned by the hydrogen. The first membrane module 21 acts as a filtering module, and the first valve 6 is opened to pump the clean water into the clean water tank 13 through the first pumping device 5.
The above steps S201 and S202 are repeated to wash the first membrane module 21 and the second membrane module 22 in a circulating manner. The reaction time of the whole sewage treatment is generally 20-60 minutes.
Alternatively, the interval setting time controls the switch 4 to automatically switch and controls the switch states of the first valve 6 and the second valve 7 to automatically switch; or,
the switch 4 is controlled to automatically switch according to the liquid level in the electric flocculation reactor 1, and the opening and closing states of the first valve 6 and the second valve 7 are controlled to automatically switch.
Specifically, the interval setting time may be set to control the automatic switching of the switch 4 and the automatic switching of the opening and closing states of the first valve 6 and the second valve 7 according to the actual sewage treatment conditions, for example, the switch 4 may be manually controlled to automatically switch by human observation.
Alternatively, when the liquid level monitoring device 8 detects that the liquid level in the electrocoagulation reactor 1 reaches a certain height, the selection end of the selector switch 4 is controlled to switch, the negative electrode of the power supply device 3 is electrically connected with the second membrane module 22, the second valve 7 on the second fluid communication pipe 142 is closed, the second membrane module 22 serves as the cathode to generate bubbles to clean filter cakes on the surface of the second membrane module 22, and when the first membrane module 21 serves as a filtering module, the first valve 6 on the first fluid communication pipe 141 is opened to communicate the first membrane module 21 with the first suction device 5, so as to perform filtering. The liquid level monitoring device 8 controls the switch 4 to automatically switch and controls the switch states of the first valve 6 and the second valve 7 to automatically switch.
According to the sewage treatment method provided by the embodiment of the disclosure, the change-over switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected with the corresponding first membrane module 21, the first valve 6 is controlled to be closed, and the second valve 7 is controlled to be opened; wherein, the first membrane module 21 is used as a cathode electrode, and the second membrane module 22 is used as a filtering module; the change-over switch 4 is controlled to control the negative electrode of the power supply device 3 to be electrically connected with the second membrane component 22, control the first valve 6 to be opened and control the second valve 7 to be closed; wherein the second membrane module 22 is used as a cathode electrode, and the first membrane module 21 is used as a filtering module. The electric flocculation and the membrane separation are realized in one electric flocculation reactor 1, the operation can realize automatic control, the occupied area of the electric flocculation reactor 1 is saved, the labor is saved, when the first membrane component 21 or the second membrane component 22 serving as the filtering component is polluted, under the condition that the first membrane component 21 and the second membrane component 22 are not detached, the sewage filtration and the membrane cleaning are simultaneously carried out through the switching of the first membrane component 21 and the second membrane component 22, the interference of the traditional membrane cleaning to the filtering process is avoided, the problems of low treatment efficiency and high cost caused by the membrane cleaning and the replacement are solved, and the sewage treatment efficiency is improved.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A sewage treatment device capable of filtering and backwashing simultaneously is characterized by comprising:
the device comprises an electrocoagulation reactor (1) and at least one component set (2), wherein the component set (2) is arranged in the electrocoagulation reactor (1), the component set (2) comprises a first membrane assembly (21), a second membrane assembly (22) and an anode electrode (23), and the first membrane assembly (21) and the second membrane assembly (22) are oppositely arranged on two sides of the corresponding anode electrode (23);
the power supply device (3) and the at least one change-over switch (4), the change-over switch (4) is arranged corresponding to the component group (2) one by one, the anode of the power supply device (3) is electrically connected with the anode electrode (23), and the change-over switch (4) is used for controlling the cathode of the power supply device (3) to be electrically connected with the corresponding first membrane assembly (21) or the corresponding second membrane assembly (22);
the first suction device (5) is communicated with the first membrane module (21) through a first fluid communication pipe (141), a first valve (6) is arranged on the first fluid communication pipe (141), the first suction device (5) is communicated with the second membrane module (22) through a second fluid communication pipe (142), and a second valve (7) is arranged on the second fluid communication pipe (142).
2. The sewage treatment apparatus capable of filtering and backwashing simultaneously according to claim 1, further comprising:
the liquid level monitoring device (8), the liquid level monitoring device (8) be located in the electric flocculation reactor (1) and with change over switch (4) electricity is connected, liquid level monitoring device (8) are used for monitoring liquid level in the electric flocculation reactor (1) is in order to control the switching of change over switch (4) select end.
3. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, wherein at least one auxiliary anode electrode is arranged 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 apparatus capable of filtering and backwashing simultaneously according to claim 1, further comprising:
reservoir (9) and second suction device (10), electroflocculation reactor (1) through third fluid communicating pipe (143) with reservoir (9) intercommunication, be provided with on third fluid communicating pipe (143) second suction device (10), second suction device (10) are used for passing through third fluid communicating pipe (143) will sewage in reservoir (9) is pumped extremely in the electroflocculation reactor (1).
5. The sewage treatment apparatus capable of filtering and backwashing simultaneously according to claim 1, further comprising:
the ozone generator (11), ozone generator (11) pass through fourth fluid communicating pipe (144) with the electric flocculation reactor (1) communicates, ozone generator (11) are used for to the electric flocculation reactor (1) interior ozone of infusing.
6. The sewage treatment apparatus capable of filtering and backwashing simultaneously according to claim 1, further comprising:
the sludge discharge device is communicated with the bottom (12) of the electric flocculation reactor through a third valve and is used for discharging the sludge of the electric flocculation reactor (1).
7. The sewage treatment device capable of filtering and backwashing simultaneously according to claim 1, wherein the first membrane module (21) comprises a conductive membrane or a non-conductive membrane and a porous conductive material, and the second membrane module (22) comprises a conductive membrane or a non-conductive membrane 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 and less than or equal to 3 cm; the distance between the second membrane assembly (22) and the corresponding anode electrode (23) is more than or equal to 1 cm and less than or equal to 3 cm.
9. A sewage treatment method performed by the sewage treatment apparatus capable of simultaneous filtration and backwashing according to any one of claims 1 to 8, the sewage treatment method comprising:
step 1, controlling the change-over switch (4) to control the negative electrode of the power supply device (3) to be electrically connected with the corresponding first membrane assembly (21), controlling the first valve (6) to be closed, and controlling the second valve (7) to be opened; wherein the first membrane module (21) is used as a cathode electrode, and the second membrane module (22) is used as a filtering module;
step 2, controlling the change-over switch (4) to control the negative electrode of the power supply device (3) to be electrically connected with the second membrane assembly (22), controlling the first valve (6) to be opened, and controlling the second valve (7) to be closed; wherein the second membrane module (22) is used as a cathode electrode, and the first membrane module (21) is used as a filtering module;
and circularly executing the step 1 and the step 2.
10. The wastewater treatment method according to claim 9, characterized in that the switch (4) is controlled to automatically switch and the switch states of the first valve (6) and the second valve (7) are controlled to automatically switch at intervals of set time; or,
controlling the switch (4) to automatically switch and controlling the on-off state of the first valve (6) and the second valve (7) to automatically switch according to the liquid level in the electric flocculation reactor (1).
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