CN115028297A - Sewage treatment system and method - Google Patents
Sewage treatment system and method Download PDFInfo
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- CN115028297A CN115028297A CN202210733915.8A CN202210733915A CN115028297A CN 115028297 A CN115028297 A CN 115028297A CN 202210733915 A CN202210733915 A CN 202210733915A CN 115028297 A CN115028297 A CN 115028297A
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Images
Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
Abstract
The present description embodiments provide a wastewater treatment system and method, the system comprising an electrocoagulation treatment assembly, the electrocoagulation treatment assembly comprising: a tank comprising a water inlet and an overflow outlet; the at least two polar plates are arranged in the box body; the at least two polar plates are made of the same material; and two polar plates positioned at the end parts of the at least two polar plates are connected with a power supply. Compared with the traditional biological and chemical method, the system has the advantages of good treatment effect, low treatment cost, no use of chemical flocculant, extremely small amount of generated solid sludge and the like.
Description
Cross-referencing
The present application claims priority from chinese application No. 202111312103.8 filed on 8/11/2021, the entire contents of which are incorporated herein by reference.
Technical Field
The specification relates to the technical field of sewage treatment, in particular to a sewage treatment system and method.
Background
With the development of industry and economy, the adverse effect on the environment is increasing due to the shortage of clean water resources and the discharge of a large amount of sewage and wastewater generated in the industrial production process. Along with the enhancement of the environmental awareness of people and the improvement of the requirement of governments on the quality of discharged sewage, the cost and the difficulty of sewage and wastewater treatment in industrial production are continuously increased. The current sewage treatment technology mainly takes biodegradation, chemical flocculation and a double-membrane method as main materials, but most of the sewage generated in industrial production cannot be biodegraded. Chemical flocculation requires the use of a large amount of chemical agents, which is not only costly, but also causes secondary pollution to the treated water due to excessive chemicals. The double-membrane method using reverse osmosis has good treatment effect, but has higher construction and maintenance cost. In order to realize carbon neutralization, energy conservation and emission reduction, ensure that the industrial wastewater treatment reaches a new national standard with lower cost, and repeatedly utilize water resources, a new sewage treatment system and a new sewage treatment method are needed to be provided.
Disclosure of Invention
One of the embodiments of the present specification provides a sewage treatment system. The wastewater treatment system includes an electrocoagulation treatment assembly, the electrocoagulation treatment assembly comprising: a tank comprising a water inlet and an overflow outlet; the at least two polar plates are arranged in the box body; the at least two polar plates are made of the same material; and two polar plates positioned at the end parts of the at least two polar plates are connected with a power supply.
In some embodiments, at least two plates are arranged in the housing at a predetermined pitch, wherein the predetermined pitch is in the range of 3mm to 10 mm.
In some embodiments, the material comprises at least one of iron, aluminum, or steel.
In some embodiments, the wastewater treatment system further comprises an air flotation and sedimentation assembly in communication with the overflow outlet such that treated water treated by the electrocoagulation treatment assembly enters the air flotation and sedimentation assembly.
In some embodiments, the system further comprises an air flotation and precipitation assembly for removing scum and precipitates from the wastewater or intermediate treatment water, wherein the air flotation and precipitation assembly is in communication with the overflow outlet such that treatment water treated by the electrocoagulation treatment assembly enters the air flotation and precipitation assembly, and/or the air flotation and precipitation assembly is in communication with the water inlet such that treatment water treated by the air flotation and precipitation assembly enters the electrocoagulation treatment assembly.
In some embodiments, the system includes an air flotation assembly for removing scum from the wastewater or intermediate treatment water, wherein the air flotation assembly is in communication with the overflow outlet to allow treatment water treated by the electrocoagulation treatment assembly to enter the air flotation assembly, and/or the air flotation assembly is in communication with the water inlet to allow treatment water treated by the air flotation assembly to enter the electrocoagulation treatment assembly.
In some embodiments, the system comprises a settling assembly for removing sediment from the wastewater or intermediate treatment water, wherein the settling assembly is in communication with the overflow outlet for treated water treated by the electrocoagulation treatment assembly to enter the settling assembly, and/or the settling assembly is in communication with the water inlet for treated water treated by the settling assembly to enter the electrocoagulation treatment assembly.
In some embodiments, the wastewater treatment system further comprises a filtration module in communication with the water outlet of the flotation and sedimentation module, the flotation module, or the sedimentation module, the filtration module comprising an ultrafiltration membrane.
One of the embodiments of the present specification provides a sewage treatment method, including: the sewage is treated by using the sewage treatment system to obtain treated water.
In some embodiments, the wastewater treatment method further comprises: controlling the wastewater to enter the electrocoagulation treatment assembly at a preset flow rate, wherein the ratio of the preset flow rate to the sum of the surface areas of the at least two plates is 50L/m 2 ˙h-300L/m 2 And in the h range.
In some embodiments, the wastewater treatment method further comprises: and controlling the power supply voltage of the power supply to be in the range of 140V-550V.
In some embodiments, the wastewater treatment method further comprises: and in the electrocoagulation treatment process, the positive and negative electrodes of the power supply are controlled to be reversed at regular time or irregular time.
Drawings
The present description will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:
FIG. 1 is a schematic view of an exemplary wastewater treatment system according to some embodiments herein.
FIG. 2 is a schematic view of an exemplary wastewater treatment system according to further embodiments herein.
FIG. 3 is a schematic diagram illustrating exemplary at least two plates connected to a power source according to some embodiments of the present description.
FIG. 4 is a block diagram of an exemplary electrocoagulation treatment assembly and an exemplary air flotation and precipitation assembly shown in accordance with some embodiments herein.
Fig. 5 is a front view of fig. 4.
Fig. 6 is a top view of fig. 4.
Fig. 7 is a partial cross-sectional view of fig. 6.
FIG. 8A is a schematic illustration of exemplary untreated wastewater according to some embodiments herein.
FIG. 8B is a schematic diagram of the wastewater of FIG. 8A after electrocoagulation and flotation and precipitation.
FIG. 8C is a schematic view of the treated water shown in FIG. 8B after being subjected to a filtering treatment.
Fig. 9, 10, 11, 13, 14, 15, 16, 17 are schematic views of exemplary wastewater treatment systems according to further embodiments of the present disclosure.
Fig. 12A and 18A are schematic views of untreated sewage, respectively.
Fig. 12B and 18B are schematic views of the wastewater shown in fig. 12A and 18A after treatment by an exemplary wastewater treatment system according to some embodiments of the disclosure.
In the figure, 100 is a sewage treatment system, 110 is an electrocoagulation treatment component, 111 is a box body, 112 is at least two polar plates, 113 is a water inlet, 114 is an electrocoagulation reaction zone water outlet, 115 is a polar plate washing aeration air inlet, 116 is an overflow outlet, 120 is an air flotation and precipitation component, 121 is an air flotation box, 1211 is an aeration zone water outlet, 1212 is a precipitation outlet, 1213 is an air flotation and precipitation treatment rear water outlet, 1214 is a slag scraping outlet, 122 is a slag scraping component, 1221 is a slag scraping power component, 1222 is a slag scraping transmission component, 1223 is a slag scraping component, 123 is an aeration component, 1231 is an air compressor, 1232 is an aeration pipeline, 1233 is an aeration head, 124 is a water level adjusting component, 125 is a water level adjusting outlet, 130 is a filtering component, and 400 is a pretreatment component.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, the present description can also be applied to other similar scenarios on the basis of these drawings without inventive effort. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.
It should be understood that "system", "apparatus", "unit" and/or "module" as used herein is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.
As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
Flow charts are used in this description to illustrate operations performed by a system according to embodiments of the present description. It should be understood that the preceding or following operations are not necessarily performed in the exact order in which they are performed. Rather, the steps may be processed in reverse order or simultaneously. Meanwhile, other operations may be added to the processes, or a certain step or several steps of operations may be removed from the processes.
The sewage treatment system provided by the embodiment of the specification can be used for treating industrial wastewater which is high in treatment difficulty and treatment cost and comprises printing and dyeing, electroplating, garbage leachate, petrochemical industry, papermaking and the like. Compared with the traditional biological and chemical methods, the system combines the electrocoagulation with the membrane method based on the electrochemical and physical separation principles, and has the advantages of good treatment effect, low treatment cost, no use of chemical flocculant, extremely small amount of generated solid sludge and the like.
FIG. 1 is a schematic view of an exemplary wastewater treatment system according to some embodiments herein.
In some embodiments, the wastewater treatment system 100 may include an electrocoagulation treatment assembly 110. The electrocoagulation treatment assembly 110 may be used to electrocoagulatively treat wastewater. In some embodiments, the electrocoagulation treatment assembly 110 may include a tank, at least two plates, and a power source.
In some embodiments, the tank may include a water inlet for introducing the wastewater into the electrocoagulation treatment assembly 110 (e.g., tank).
In some embodiments, the cabinet may include a floor and at least two side panels. In some embodiments, the cabinet may or may not include a top panel. The bottom plate and at least two side panels can be enclosed into a cylindrical box body or a cuboid box body with an opening at the upper end. For example, the box body can comprise a bottom plate and four side panels, wherein the four side panels are perpendicular to the bottom plate to form a rectangular box body with an upper end opened.
In some embodiments, the height of at least two side panels may be different. For example, three of the four side panels may have the same height and be higher than the other side panel. In some embodiments, the upper surface of the lowest-level side panel of the at least two side panels and the side portions of the remaining side panels that are higher than the lowest-level side panel may form an overflow outlet for draining the treated water after electrocoagulation treatment out of the electrocoagulation treatment assembly 110 (e.g., a tank).
In some embodiments, the material of the at least two side panels may include an insulating material, or the inner sides of the at least two side panels may be adhered with an insulating material having an area equal to that of the side panels. In some embodiments, the insulating material may include, but is not limited to, fiber, rubber, or plastic, among others.
In some embodiments, at least two plates may be arranged within the housing. For example, at least two plates may be arranged in parallel in the housing perpendicular to the bottom plate of the housing. In some embodiments, at least two plates may be arranged in the case at a predetermined interval.
Since the predetermined distance may affect the treatment effect of the wastewater (e.g., pollutant removal rate, wastewater treatment efficiency), for example, too small a predetermined distance may cause a reduction in the flow rate of the wastewater between the at least two plates, or at least two plates may release too much metal ions (e.g., Fe) 2+ 、Fe 3+ 、Al 3+ ) Leading to excessive treatment of the sewage and further reducing the treatment efficiency; for example, if the predetermined distance is too large, the voltage cannot break down the sewage between at least two polar plates, and thus the charge balance in the sewage cannot be destroyed, and the pollutant removal rate is reduced. Thus, in some embodiments, the predetermined spacing is required to satisfy a predetermined condition.
In some embodiments, the preset spacing may be in the range of 3mm-10 mm. In some embodiments, the predetermined spacing may be in the range of 3.5mm to 9.5 mm. In some embodiments, the preset spacing may be in the range of 4mm-9 mm. In some embodiments, the predetermined spacing may be in the range of 4.5mm-8.5 mm. In some embodiments, the preset spacing may be in the range of 5mm-8 mm. In some embodiments, the predetermined spacing may be in the range of 5.5mm to 7.5 mm. In some embodiments, the preset spacing may be in the range of 6mm to 7 mm. In some embodiments, the preset spacing may be in the range of 6.4mm-6.8 mm. It should be noted that the preset distance range may include a distance range after the at least two electrode plates are changed in the sewage treatment process. For example, during electrocoagulation treatment, portions of at least two plates are consumed, resulting in a reduction in the thickness of the at least two plates, further resulting in an increase in the spacing between the at least two plates. The increased pitch is also within the preset pitch range.
In some embodiments, the material of at least two plates may be the same. In some embodiments, the plate material may be selected based on the nature of the wastewater (e.g., source of the wastewater, type and amount of contaminants in the wastewater, etc.). In some embodiments, the material may include at least one of iron, aluminum, an iron alloy (e.g., steel), or an aluminum alloy. For example, the material of each of the at least two plates may be iron. For another example, each of the at least two plates may be made of aluminum. For another example, each of the at least two plates may be made of steel. For another example, the material of each of the at least two plates may include iron and aluminum.
In some embodiments, two of the at least two plates at the ends may be connected to a power source to form a current loop. In some embodiments, two plates at the end and one plate arranged in the middle of the at least three plates may be connected in parallel with the power supply to form two current loops. For example, two of the at least three electrode plates located at the end portion are anodes and one of the at least three electrode plates located at the middle portion is a cathode, or two of the at least three electrode plates located at the end portion are cathodes and one of the at least three electrode plates located at the middle portion is an anode.
In embodiments of the present description, the intermediate treated water may refer to treated water treated by at least one treatment assembly (e.g., an electrocoagulation treatment assembly, an air flotation and precipitation assembly, an air flotation assembly, a precipitation assembly, a filtration assembly, etc.). The communication may comprise fluid communication.
In some embodiments, the wastewater treatment system 100 may further include an air flotation and sedimentation assembly 120. In some embodiments, the combined air flotation and precipitation assembly 120 may be used to remove scum and sediment from sewage or intermediate process water. In some embodiments, the flotation and precipitation assembly 120 may be in communication with an overflow outlet of the electrocoagulation treatment assembly 110 such that the treated water after electrocoagulation treatment enters the flotation and precipitation assembly 120 for flotation and precipitation treatment. In some embodiments, the aero-flotation precipitation assembly 120 may be in communication with a water inlet of the electrocoagulation treatment assembly 110 to allow treated water treated by the aero-flotation precipitation assembly to enter the electrocoagulation treatment assembly 110.
In some embodiments, the aerostatic and precipitation assembly 120 may comprise an aerostatic assembly and a precipitation assembly. In some embodiments, the air flotation assembly may include an air flotation tank, a slag scraper, and an air compressor. In some embodiments, the sedimentation assembly may comprise a sedimentation tank. In some embodiments, the flotation tank and the settling tank may be the same tank or different tanks. For example, the flotation tank and the settling tank in the flotation and settling assembly 120 may be the same tank or communicate with each other through an intermediate tank. In some embodiments, the water inlet and outlet of the flotation and sedimentation assembly 120 may be located on the flotation tank or sedimentation tank. In some embodiments, the floatation and sedimentation assemblies in the floatation and sedimentation assembly 120 may be in communication with each other. The air flotation module and the precipitation module in the air flotation and precipitation module 120 may be two modules independent of each other. For the description of the flotation and precipitation assembly 120, reference may be made to other parts of the present specification (for example, fig. 4-7 and the description thereof), and details are not repeated herein.
In some embodiments, the wastewater treatment system 100 may include an air flotation assembly for removing scum from wastewater or intermediate treatment water. In some embodiments, the air flotation assembly may be in communication with an overflow outlet of the electrocoagulation treatment assembly 110 so that the treated water treated by the electrocoagulation treatment assembly enters the air flotation assembly for air flotation treatment. In some embodiments, the air flotation assembly may be in communication with a water inlet of the electrocoagulation treatment assembly 110 to allow treated water treated by the air flotation assembly to enter the electrocoagulation treatment assembly 110. In some embodiments, the water inlet and outlet of the air flotation assembly may be located on the air flotation tank.
In some embodiments, the wastewater treatment system 100 may include a sedimentation component for removing sediment from wastewater or intermediate treatment water. In some embodiments, the precipitation assembly may be in communication with an overflow outlet of the electrocoagulation treatment assembly 110 such that treated water treated by the electrocoagulation treatment assembly enters the precipitation assembly for precipitation treatment. In some embodiments, the precipitation assembly may be in communication with a water inlet of the electrocoagulation treatment assembly 110 to allow treated water treated by the precipitation assembly to enter the electrocoagulation treatment assembly 110. In some embodiments, the water inlet and outlet of the sedimentation assembly may be located on the sedimentation tank.
In some embodiments, the wastewater treatment system 100 may further include a filter assembly 130 for filtering wastewater or intermediate treatment water. In some embodiments, filter assembly 130 may include a water inlet and a water outlet. In some embodiments, the water inlet of the filtering assembly 130 may be in communication with the water outlet of the flotation and precipitation assembly 120, the flotation assembly, or the precipitation assembly, so that the treated water after the flotation and precipitation, flotation, or precipitation treatment enters the filtering assembly 130 for filtration treatment (e.g., ultrafiltration treatment, membrane separation and biological treatment, and membrane filter pressing treatment). In some embodiments, the water outlet of the filtration assembly 130 may be in communication with the water inlet of the electrocoagulation treatment assembly 110 to allow the filtered treated intermediate treated water to enter the electrocoagulation treatment assembly 110 for electrocoagulation treatment.
In some embodiments, filtration assembly 130 may include, but is not limited to, a hollow fiber membrane assembly, a flat sheet membrane assembly, or a tubular membrane assembly.
In some embodiments, the filtration assembly 130 may include at least one of an ultrafiltration membrane component, a membrane bioreactor component, or a membrane filter press component. In some embodiments, at least two of the ultrafiltration membrane component, the membrane bioreactor component, and the membrane filter press component can be in communication with one another to perform at least two filtration processes. For example, the water outlet of the filter press membrane component may be in communication with the water inlet of an ultrafiltration membrane component or a membrane bioreactor component. As another example, the water outlet of the membrane bioreactor component may be in communication with the water inlet of an ultrafiltration membrane component or a membrane filter press component. For another example, the water outlet of the membrane filter press component may be in communication with the water inlet of the membrane bioreactor component, and the water outlet of the membrane bioreactor component may be in communication with the water inlet of the ultrafiltration membrane component.
In some embodiments, the ultrafiltration membrane component may comprise an ultrafiltration membrane. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 50nm to 200 nm. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 60nm to 190 nm. In some embodiments, the pore size of the ultrafiltration membrane can be in the range of 70nm to 180 nm. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 80nm to 170 nm. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 90nm to 160 nm. In some embodiments, the pore size of the ultrafiltration membrane can be in the range of 100nm to 150 nm. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 110nm to 140 nm. In some embodiments, the pore size of the ultrafiltration membrane may be in the range of 120nm to 130 nm.
In some embodiments, the wastewater treatment system 100 may further include a storage tank for storing intermediate treatment water. In some embodiments, the storage tank may include a water inlet and a water outlet. In some embodiments, the water inlet and the water outlet of the water storage tank may be in communication with the water outlet or the water inlet, respectively, of other components or components in the wastewater treatment system 100 (e.g., an electrocoagulation treatment component, a combined flotation and precipitation component, a flotation component, a precipitation component, an ultrafiltration membrane component, a membrane filter press component, a membrane bioreactor component).
FIG. 2 is a schematic view of an exemplary wastewater treatment system according to further embodiments herein.
In some embodiments, the electrocoagulation treatment assembly 110 may include at least two tanks. At least two plates may be arranged in each of the at least two tanks. The polar plate material in every box in at least two boxes is the same. The relevant description of the tank and the at least two plates can be referred to in other parts of the specification (for example, fig. 1 and the description thereof), and the description is not repeated here.
As shown in fig. 2, the case may include m, i.e., a 1 st case and a 2 nd case … mth case. In some embodiments, the number of at least two plates in different ones of the at least two tanks may be the same or different. In some embodiments, the material of the plates in different ones of the at least two tanks may be the same or different. For example, the material of the pole plate in the 1 st box and the material of the pole plate in the 2 nd box may be the same and are both iron. For another example, the polar plates in the 1 st box are all made of iron, and the polar plates in the 2 nd box are all made of steel.
As shown in fig. 2, two of the at least two plates in each of the at least two tanks located at the end may be connected to a power supply to form a plurality of parallel circuits for treating a large amount of sewage. In some embodiments, the overflow outlets of each of the at least two tanks may be in communication to funnel the electrocoagulatively treated water overflowing from each tank into the aero-flotation and precipitation assembly 120 for further aero-flotation and precipitation treatment. In some embodiments, the water outlet of the flotation and precipitation assembly 120 may be in communication with the filtering assembly 130 to filter the treated water after the flotation and precipitation treatment. The description of the flotation and precipitation assembly 120 and the filtration assembly 130 can be referred to in other parts of the present specification (for example, fig. 1 and the description thereof), and will not be repeated herein.
It should be noted that the above description of the wastewater treatment system 100 is for illustration and explanation only, and does not limit the scope of application of the present application. Various modifications and alterations to sewage treatment system 100 will be apparent to those skilled in the art in light of this application. However, such modifications and variations are still within the scope of the present application. For example, the number and communication relationship of the electrocoagulation treatment unit 110, the flotation and sedimentation unit 120, the flotation unit, the sedimentation unit, and the ultrafiltration membrane unit, the membrane bioreactor unit, and the membrane filter press unit in the filtration unit 130 in the wastewater treatment system 100 can be adjusted adaptively according to the wastewater quality.
The embodiment of the specification also provides a sewage treatment method. In some embodiments, the method may be performed by one or more components in a wastewater treatment system 100 (e.g., as shown in fig. 1 or 2). In some embodiments, the method may be performed automatically by a control system. For example, the method may be implemented by a control instruction, and the control system controls each component to complete each operation of the method based on the control instruction. In some embodiments, the method may be performed semi-automatically. For example, one or more operations of the method may be performed manually by an operator. In some embodiments, one or more additional operations not described may be added, and/or one or more operations discussed herein may be deleted. Additionally, the order of the operations shown in FIG. 1 or FIG. 2 is not intended to be limiting.
In some embodiments, the wastewater may be controlled to enter the electrocoagulation treatment assembly 110 at a preset flow rate during electrocoagulation treatment. In some embodiments, the preset flow rate may be in the range of 10t/h to 30 t/h. In some embodiments, the preset flow rate may be in the range of 12t/h to 28 t/h. In some embodiments, the preset flow rate may be in the range of 14t/h to 26 t/h. In some embodiments, the predetermined flow rate may be in the range of 16t/h to 24 t/h. In some embodiments, the preset flow rate may be in the range of 18t/h to 22 t/h. In some embodiments, the preset flow rate may be in the range of 19t/h to 20 t/h.
In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 50L/m 2 ˙h-1000L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be at 100L/m 2 ˙h-900L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 150L/m 2 ˙h-800L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 180L/m 2 ˙h-700L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 200L/m 2 ˙h-600L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 230L/m 2 ˙h-500L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 250L/m 2 ˙h-400L/m 2 And in the h range. In some casesIn an embodiment, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 280L/m 2 ˙h-380L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be at 300L/m 2 ˙h-360L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be at 320L/m 2 ˙h-340L/m 2 And in the h range.
In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 50L/m 2 ˙h-300L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 60L/m 2 ˙h-280L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 70L/m 2 ˙h-260L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 80L/m 2 ˙h-240L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be at 90L/m 2 ˙h-220L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 100L/m 2 ˙h-200L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be at 110L/m 2 ˙h-190L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 120L/m 2 ˙h-180L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 130L/m 2 ˙h-170L/m 2 And in the h range. In some embodiments, the ratio of the predetermined flow rate to the sum of the surface areas of the at least two plates may be 150L/m 2 ˙h-160L/m 2 And in the h range.
In some embodiments, the supply voltage of the power supply may be controlled during electrocoagulation treatment to provide a suitable breakdown voltage to destabilize surface charges of suspended matter in the wastewater, further increasing the removal rate of contaminants in the wastewater. In some embodiments, the supply voltage may be in the range of 60V-600V. In some embodiments, the supply voltage may be in the range of 80V-550V. In some embodiments, the supply voltage may be in the range of 100V-500V. In some embodiments, the supply voltage may be in the range of 120V-450V. In some embodiments, the supply voltage may be in the range of 150V-400V. In some embodiments, the supply voltage may be in the range of 180V-380V. In some embodiments, the supply voltage may be in the range of 200V-350V. In some embodiments, the supply voltage may be in the range of 210V-340V. In some embodiments, the supply voltage may be in the range of 220V-330V. In some embodiments, the supply voltage may be in the range of 230V-320V. In some embodiments, the supply voltage may be in the range of 240V-310V. In some embodiments, the supply voltage may be in the range of 250V-300V. In some embodiments, the supply voltage may be in the range of 260V-290V. In some embodiments, the supply voltage may be in the range of 270V-280V.
In some embodiments, the supply voltage may be in the range of 140V-550V. In some embodiments, the supply voltage may be in the range of 160V-500V. In some embodiments, the supply voltage may be in the range of 180V-450V. In some embodiments, the supply voltage may be in the range of 100V-400V. In some embodiments, the supply voltage may be in the range of 120V-350V. In some embodiments, the supply voltage may be in the range of 140V-300V. In some embodiments, the supply voltage may be in the range of 160V-250V. In some embodiments, the supply voltage may be in the range of 180V-200V.
In some embodiments, the output direct current may be controlled to be in the range of 1A-500A during electrocoagulation treatment. In some embodiments, the direct current may be in the range of 5A-400A. In some embodiments, the DC current may be in the range of 10A-300A. In some embodiments, the direct current may be in the range of 12A-200A. In some embodiments, the DC current may be in the range of 14A-100A. In some embodiments, the direct current may be in the range of 16A-80A. In some embodiments, the DC current may be in the range of 18A-60A. In some embodiments, the DC current may be in the range of 20A-50A. In some embodiments, the DC current may be in the range of 22A-40A. In some embodiments, the DC current may be in the range of 24A-38A. In some embodiments, the DC current may be in the range of 26A-36A. In some embodiments, the DC current may be in the range of 28A-34A. In some embodiments, the DC current may be in the range of 30A-32A.
In some embodiments, the polarity of the voltage may be reversed at regular or irregular intervals during the electrocoagulation treatment process to ensure that the plates are not passivated, which not only improves the utilization of the plates, but also improves the removal of contaminants.
In embodiments herein, the combination of the electrocoagulation treatment assembly 110 and one of the combined flotation and precipitation assembly 120, the flotation assembly, or the precipitation assembly may be referred to as a pretreatment assembly. Accordingly, the combination of electrocoagulation treatment and one of air flotation and precipitation treatment, air flotation treatment, or precipitation treatment may be referred to as pretreatment. In the pretreatment process, after the wastewater enters the electrocoagulation treatment assembly 110, under high-voltage direct current voltage, a polar plate (such as an iron plate, a steel plate or an aluminum plate) in the box body is oxidized at a polar plate/solution interface, and metal ions (such as Fe) are dissolved on an anode 2+ 、Fe 3+ Or Al 3+ ). These metal ions have a tendency to hydrate, and particularly metal ions charged to +3 or more will tend to provide hydronium cations (H) from the surrounding hydrated species 3 O + Bronsted acid). The reaction formulas (1) to (3) represent Fe 3+ Acidic reaction of cation, the reaction formulas (4) to (6) represent Al 3+ Acidic reaction of the cation.
Cathode electrolysis of water to produce hydroxyl ions (OH) - ) Hydroxyl ions and metal ions from the anode (e.g., Fe) 2 + 、Fe 3+ Or Al 3+ ) Combining to generate corresponding hydroxide or oxide at proper pH value. Upon coupling with metal ions, OH - Two or more metal hydroxides can also be connected together as a bridging group to undergo further dimerization or polymerization reactions to form a gel-like hydroxide, which can be represented by the following reaction formulas (7) to (8):
2(Fe(H 2 O) 5 (OH)) 2+ →(Fe 2 (H 2 O) 8 (OH) 2 ) 4+ +2H 2 O (7)
2(Al(H 2 O) 5 (OH)) 2+ →(Al 2 (H 2 O) 8 (OH) 2 ) 4+ +2H 2 O (8)
the gel-like hydroxide may further carry suspended solids or dissolved substances as it grows and settles. The ability and characteristics of the contaminants to aggregate will vary with the physicochemical properties of the resulting gelatinous hydroxide, the surrounding medium, and the type of solid suspended or dissolved contaminants in solution. Key properties of gel-like hydroxides include charge, porosity, and the type of bonding that occurs in the hydroxide or with contaminants. Due to sufficient over currentIn the bipolar electrolysis of water, gas (usually O) is also produced 2 And H 2 ) They will float to the surface with some of the condensed contaminants to form suspended solids.
The anode can release metal ions M due to various complex synergistic effects in the electrocoagulation treatment process n+ And gas molecules (e.g., O) 2 ) The cathode can generate hydroxyl ions OH - And gas molecules (e.g., H) 2 ). The ions and gas molecules can enter the sewage together, and the negatively and positively charged ions in the sewage can be respectively mixed with M n+ And OH - Binding to form a complex. The released hydrogen or oxygen can bring part of the complex to the water surface to form a floating layer. Because electrons can break through sewage from a cathode and move to an anode from a polar plate arranged in the middle, the stability of surface charges of suspended substances in the sewage is damaged, and the suspended substances are attached to a complex compound in the water and are brought to the water surface together to form a floating layer. Heavy metal ions and organic molecules in the sewage are oxidized or reduced on the polar plate to generate gas, water-insoluble solid or complex. The above processes interact with each other, and finally pollutants in the sewage can be gathered to obtain scum and sediment.
The process of electrons from the cathode to break through the sewage and the electrode plate arranged in the middle to the anode can be understood as the strong direct current electric field effect. FIG. 3 is a schematic diagram illustrating exemplary at least two plates connected to a power source according to some embodiments of the present description. In the embodiments of the present disclosure, at least two plates arranged in the box may also be referred to as a plate array. As shown in fig. 3, when a dc voltage is applied to at least two plates or two plates at the end of the plate array, positive charges are distributed on the surface of the anode plate a, and electrons (negative charges) of the plate b adjacent to the anode plate a are moved to one side close to the anode plate a by the field effect, so that the side is distributed with negative charges, and thus the other side (one side far away from the plate a and one side close to the plate c (the plate adjacent to the plate b)) of the plate b is distributed with positive charges, and in this chain reaction, the plates arranged in the middle of the plate array form an electric field between each other until reaching the cathode plate connected to the negative pole of the dc power supply. Since the sewage flowing between the plates in the plate array contains a large amount of conductive ions, molecules or suspended particles, electrons can pass through the sewage from the cathode plate and all the plates arranged in the middle to reach the anode plate.
In the electrocoagulation treatment process, as the positive and negative poles of the voltage are reversed at regular time, all the polar plates in the polar plate array release metal ions and oxygen on one side and hydroxyl ions and hydrogen on the other side, and substances in the sewage can be oxidized or reduced on both sides of all the polar plates.
After the sewage is subjected to electrocoagulation treatment, the sewage flows into the air floatation and precipitation assembly 120, the air floatation assembly or the precipitation assembly through the overflow outlet, most of solid-liquid separation is completed in the air floatation and precipitation assembly 120, the air floatation assembly or the precipitation assembly, and slag scraping and/or precipitation and intermediate treatment water are obtained.
The treated water after the air flotation and precipitation treatment, the air flotation treatment or the precipitation treatment can respectively enter the filtering assembly 130 through the air flotation and precipitation assembly 120, the air flotation assembly or the water outlet of the precipitation assembly, and the filtering assembly 130 can remove other suspended solid matters in the treated water and discharge the qualified reusable water or the treated water which can be directly discharged.
FIG. 4 is a block diagram of an exemplary electrocoagulation treatment assembly and an exemplary air flotation and precipitation assembly shown in accordance with some embodiments herein. Fig. 5 is a front view of fig. 4. Fig. 6 is a top view of fig. 4. Fig. 7 is a partial cross-sectional view of fig. 6.
As shown in fig. 4-7, the pretreatment assembly 400 may include an electrocoagulation treatment assembly 110 and an aerosol precipitation assembly 120.
The electrocoagulation treatment assembly 110 may include a tank 111, at least two plates 112, and a power source (not shown). At least two plates 112 may be arranged within the case 111. In some embodiments, the power source may be located outside the enclosure 111.
In some embodiments, the tank 111 may be connected as a separate component to the flotation and sedimentation assembly 120 (e.g., flotation tank, sedimentation tank) via a conduit. In some embodiments, the tank 111 may also be integrated with the flotation and sedimentation assembly 120 (e.g., flotation tank, sedimentation tank).
As shown in FIGS. 5 and 7, the tank 111 may include a water inlet 113 for introducing the wastewater into the electrocoagulation treatment assembly 110 (e.g., tank 111). In some embodiments, the water inlet 113 may also be used to introduce a plate-rinsing cleaning fluid (e.g., fresh water) into the tank 111 to clean the tank 111 and the at least two plates 112.
The tank 111 may also include an electrocoagulation reaction zone drain 114 for draining retentate water from the tank 111 after electrocoagulation treatment (e.g., treated water that fails to overflow through overflow outlet 116 to the combined flotation and precipitation assembly 120) and wastewater from cleaning the plates and the tank 111. In some embodiments, as shown in fig. 5 and 7, the tank 111 may further comprise a plate rinse aeration inlet 115 for introducing gas into the tank 111 to rinse the tank 111 and at least two plates 112.
As shown in FIG. 7, the electrocoagulation treatment assembly 110 (e.g., tank 111) may be in communication with an flotation and precipitation assembly 120 (e.g., flotation tank, precipitation tank) via an overflow outlet 116.
The combined flotation and precipitation assembly 120 may include a flotation assembly and a precipitation assembly. In some embodiments, the air flotation assembly may include an air flotation tank 121, a slag scraping component 122, and an aeration component 123. In some embodiments, the settling assembly may include a settling tank. In some embodiments, as shown in fig. 4-7, the flotation tank and the settling tank are the same tank.
In some embodiments, air flotation tank 121 may include aeration zone drain 1211, sedimentation drain 1212, post-air flotation and sedimentation drain 1213, and scum drain 1214.
In some embodiments, the slag scraping component 122 may include a slag scraping power element 1221, a slag scraping transmission element 1222, and a slag scraping element 1223. In some embodiments, the slag scraping power element 1221 and the slag scraping transmission element 1222 may be in transmission connection. In some embodiments, the slag scraping drive element 1222 and the slag scraping element 1223 can be connected (e.g., fixedly connected). In some embodiments, the scraper drive element 1222 may include, but is not limited to, a gear chain drive element or a belt drive element. As an example, the slag scraping power element 1221 (e.g., a motor) may drive the slag scraping transmission element 1222 to move, the slag scraping transmission element 1222 may further drive the slag scraping element 1223 (e.g., a scraper) to scrape off floating scum, and the scraped scum may be discharged through the scum discharge port 1214.
In some embodiments, aeration component 123 can include an air compressor 1231, an aeration line 1232, and an aeration head 1233. The air compressor 1231 and the aeration head 1233 may be connected by an aeration line 1232. The gas (e.g., air) output from the air compressor 1231 may be discharged into the air flotation tank 121 through the aeration pipe 1232 and the aeration head 1233.
In some embodiments, as shown in fig. 7, the air flotation tank 121 may include an aeration zone M and a convection zone N. In some embodiments, the aeration zone M and the convection zone N may be divided by a partition L. In the aeration zone M, part of the treatment water after electrocoagulation treatment is mixed with gas to generate gas-dissolved water. In some embodiments, the volume of the aerated water may be controlled not to exceed 20% of the volume of the treated water flowing out of the overflow outlet 116 by controlling the aeration amount of the aeration part 123.
After being treated in the aeration zone M, the treated water after electrocoagulation treatment can overflow to the upper part of the clapboard L and enter the advection zone N. The treated water retained in the aeration zone M (e.g., the treated water that fails to overflow above the partition L) may be discharged through an aeration-zone drain 1211. The treated water after the flotation and precipitation treatment can be discharged from the other side of the horizontal flow region N (e.g., the side away from the aeration region M) through the drainage port 1213 after the flotation and precipitation treatment, and then enter the filtering assembly 130.
In some embodiments, the flotation and sedimentation assembly 120 may further include a water level adjusting member 124 and a water level adjusting discharge port 125 for adjusting the water level inside the flotation tank 121.
The dashed arrows in fig. 7 may represent the treatment lines in the sewage aftertreatment assembly 400. As shown in FIG. 7, sewage enters the tank 111 through the water inlet 113, the water level in the tank 111 rises, and the sewage passes through the electrode plate arrays with high-voltage DC voltage applied to the two ends for electrocoagulation and then enters the aeration zone M through the overflow outlet 116. In the aeration zone M, the treated water after electrocoagulation treatment is mixed with the gas from the aeration head 1233 and overflows into the advection zone N. Various substances in the sewage react in the advection area N, part of the substances float to the water surface to form scum, and part of the substances form sediment and sink to the bottom of the air flotation tank 121. Dross formed on the surface is scraped off by the dross scraping member 122, and the precipitate is discharged through the precipitation discharge port 1212. The clear liquid in the middle part is discharged from a water outlet 1213 after air floatation and sedimentation treatment, and then enters the filter assembly 130, and finally discharged into the discharge water reaching the standard or recycled reclaimed water after being treated by the filter assembly 130.
As shown in fig. 1 to 7, the processing flow of the present embodiment is as follows: (1) the sewage is introduced into the tank 111 at a predetermined flow rate. The flow rate of the wastewater in each tank (e.g., the 1 st tank, the 2 nd tank, or the m-th tank) may be in the range of 10 tons/hour to 30 tons/hour, depending on the quality of the wastewater.
(2) According to the difference of sewage quality and flow rate, when sewage enters the box body 111, the high-voltage direct current power supply applies 60V-600V high-voltage direct current on two polar plates at the end part in a polar plate array consisting of at least two polar plates 112, and direct current output of 1A-500A can be generated.
(3) The sewage overflows to the air floatation and precipitation assembly 120 or the aeration zone M of the air floatation assembly through the overflow outlet 116 after passing through the polar plate array, enters and fills the area where the aeration head 1233 is located, and overflows into the advection zone N of the air floatation and precipitation assembly 120 after being mixed with the gas or the dissolved gas water released by the aeration head 1233.
(4) Part of the materials in the sewage in the horizontal flow region N of the flotation and precipitation module 120 will form scum and float on the water surface. The scum is removed by the scum component 122 and enters the sludge zone, and is eventually discharged by a scum discharge outlet 1214. Part of the substances in the wastewater in the horizontal flow region N of the aero-flotation and sedimentation assembly 120 or sedimentation assembly will form sediment, and finally discharged through the sediment discharge port 1212.
(5) The treated water after the pretreatment (electrocoagulation treatment and air flotation and precipitation treatment) is discharged from the air flotation and precipitation treatment rear discharge port 1213, and enters the filter module 130.
(6) After being filtered by the filtering assembly 130, the reclaimed water which can reach the standard or can be recycled can be produced.
According to the embodiment of the specification, various kinds of sewage containing different pollutants are treated, and the obtained experimental results are shown in table 1.
Table 1 pollutant removal rate experimental results table
In some embodiments, the pollutant removal rate can be increased by modifying the wastewater treatment system, for example, by adjusting the number and communication of the components. In some embodiments, the removal rate of Chemical Oxygen Demand (COD) can reach 60% -98%. In some embodiments, the removal rate of ammonia may reach 50% -70%. In some embodiments, the removal rate of tin may reach 90% -99%. In some embodiments, thallium removal may be 86% -99%. In some embodiments, fluoride removal rates may reach 62% -99%.
Example 1
FIG. 8A shows the dyeing wastewater from a certain Carex dye house, which has an initial COD of 980 mg/L. Initial test data for other items of this effluent are shown in the "effluent" column of table 2.
The dyeing wastewater is treated using a wastewater treatment system as shown in FIG. 1 or FIGS. 4-7. The sewage enters a pretreatment assembly (an electrocoagulation treatment assembly and an air floatation and sedimentation assembly), the polar plates are made of low-carbon steel, and the distance between the polar plates is within the range of 5mm-6 mm. The flow rate of the sewage is controlled to be 10 tons per hour, 350V direct current voltage is applied, and the output direct current is 32A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water at the surface of the plates) is 280 litres/square metre/hour with an energy density of about 1.35 kWh/ton (kWh/ton), i.e. 1.35 degrees electricity is consumed to treat 1 ton of contaminated water. After pretreatment, the chemicals in the wastewater float upward to form scum, as shown in fig. 8B. After the scum is removed by the scum removal part, the treated water enters a filter assembly (ultrafiltration membrane part) for filtration treatment, and the treated water after filtration treatment is shown in fig. 8C. COD in the treated water after filtration treatment is reduced to 110mg/L, and the removal rate reaches 88.78%. The values and removal rates of other items in the wastewater after treatment are shown in Table 2.
The calculation mode of the removal rate is as follows: removal rate (1-concentration after treatment/concentration before treatment) × 100%. The undetected aniline is detected to be lower than 0.03mg/L according to the lowest detection concentration of GB/T11889-1989, and the undetected hexavalent chromium is detected to be lower than 0.004mg/L according to the lowest detection concentration of GB/T7467-1987. The index which is not detected after the treatment is marked with a removal rate of 90 percent.
Table 2 table of experimental results of example 1
The technologies originally used in the Jiaxing printing and dyeing plant are AO (anaerobic oxygen) activated sludge process and chemical flocculation process, and the treatment cost (including various chemical agents, power consumption and the like) of each ton of sewage is about 6 yuan.
By adopting the technical scheme of the embodiment, 70g-80g of the pole plates are consumed, and the whole power consumption of the sewage treatment system is 1.8 degrees/ton of sewage. The average electricity price per day is 0.6 yuan/degree, the low-carbon steel plate is 6000 yuan/ton and the chemical agent is about 0.74 yuan/ton of sewage, and the total sewage treatment cost is 2.3 yuan/ton. Compared with the original treatment process (AO activated sludge process and chemical flocculation process), the cost can be reduced by more than 60%.
Compared with the activated sludge method which needs uninterrupted electric aeration, the embodiment can adopt intermittent aeration, so that the low-trough electricity price of only 12 hours per day (the large industrial electricity price carried out in 10 and 15 days of 2021 year in Jiaxing city) can be used, and the treatment cost of each ton of sewage is less than 1.7 yuan. Therefore, the total cost of the present embodiment is no more than one third of the cost of the original treatment process.
The technical scheme of the embodiment is adopted to treat the sewage of the Jiaxing printing and dyeing mill, and about 100g of sludge is generated per ton of sewage. And the sewage of the Jiaxing printing and dyeing mill is treated by adopting a chemical flocculation method, about 400g of sludge is generated in each ton of sewage, and the sewage of the Jiaxing printing and dyeing mill is treated by adopting an activated sludge method, about 3kg-5kg of sludge is generated in each ton of sewage. Therefore, compared with the chemical flocculation method and the activated sludge method, the technical scheme of the embodiment has the advantage of producing a small amount of solid sludge.
Since chemical flocculation methods generally require the use of a variety of chemicals, and the chemicals are usually present in slight excess. Compared with a chemical flocculation method, the technical scheme of the embodiment of the specification can avoid the problem of secondary pollution of treated water.
Example 2
The dyeing wastewater from a certain printing and dyeing mill was treated using the wastewater treatment system shown in FIG. 1 or FIGS. 4 to 7 according to the treatment parameters shown in Table 3 below, and the results of the experiments are shown in tables 4 to 6, respectively.
Table 3 example 2 processing parameters table
Table 4 table of #1 experimental results in example 2
Table 5 table of #2 experimental results in example 2
Table 6 table of experimental results of #3 in example 2
As can be seen from tables 4-6, the treated water treated by the sewage treatment system all meets the indirect discharge standard GB 4287-2012.
Example 3
The sewage treatment system shown in figure 9 is used for treating printing and dyeing sewage of a certain printing and dyeing mill in Zhejiang. The sewage enters the electrocoagulation treatment component, the polar plates are made of iron, and the distance between the polar plates is within the range of 7mm-9 mm. The DC voltage of 420V is applied, and the output DC current is 22.4A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 70 litres/m/h. And (3) the intermediate treatment water after electrocoagulation treatment enters an air floatation assembly for separation, and the intermediate treatment water after scum removal by adopting a scum scraping component enters an ultrafiltration membrane component for filtration treatment to obtain treatment water. And (3) the scum after the scum scraping treatment enters a membrane filter press component for filtering treatment, the intermediate treated water after the membrane filter pressing treatment enters a water storage tank, and then enters an ultrafiltration membrane component from the water storage tank for filtering treatment, so that treated water is obtained. The results of the sewage treatment are shown in Table 7.
Table 7 table of experimental results of example 3
As can be seen from Table 7, the treated water after being treated by the sewage treatment system meets the indirect discharge standard GB 4287-2012. The power consumption and the consumption of other consumable articles are comprehensively calculated, and the processing cost is about 1.7 yuan per ton.
Example 4
A wastewater treatment system as shown in FIG. 10 was used to treat nickel-containing wastewater from a certain electroplating plant in the Shanghai. And enabling the sewage to enter a precipitation assembly for precipitation treatment. And taking the treated water (clear liquid) after the precipitation treatment, and enabling the treated water (clear liquid) to enter an electrocoagulation treatment assembly, wherein the polar plates are made of iron, and the distance between the polar plates is within the range of 5-6 mm. A DC voltage of 300V was applied, and the output DC current was 17.6A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 70 litres/m/h. And (3) the precipitate obtained after the precipitation treatment enters a membrane filter press component for filtration treatment, and the treated water after the membrane filter pressing treatment enters a water storage tank and then enters an electrocoagulation treatment component from the water storage tank.
And (3) the intermediate treated water after the electrocoagulation treatment enters an air floatation assembly for separation, and the intermediate treated water after scum removal by adopting a scum scraping component enters an ultrafiltration membrane component for filtration treatment to obtain treated water. And (3) the scum after the scum scraping treatment enters a membrane filter press component for filtering treatment, the intermediate treated water after the membrane filter pressing treatment enters a water storage tank, and then enters an ultrafiltration membrane component from the water storage tank for filtering treatment, so that treated water is obtained. The sewage is treated from light green to clear and transparent treated water. The results of the sewage treatment are shown in Table 8.
Table 8 table of experimental results of example 4
| Item | Emission standard | Raw water | After treatment | Unit | Removal rate |
| COD(Cr) | 500 | 169 | 130 | mg/L | 23.1％ |
| Nickel (II) | 0.1 | 310-450 | 0.06 | mg/L | 99.98％-99.99％ |
As can be seen from Table 8, the treated water after treatment by the sewage treatment system meets the discharge standard. The original technology used in Shanghai electroplating plants is chemical oxidation and chemical flocculation, and the treatment cost (including various chemical agents and power consumption) of each ton of sewage is about 20 yuan. The treatment cost of each ton of sewage is about 3.2 yuan by adopting the embodiment. Therefore, compared with the original treatment process (chemical oxidation and chemical flocculation), the cost can be reduced by 84%.
Example 5
The sewage containing nickel and cyanide of a certain electroplating plant in the Shanghai was treated using the sewage treatment system shown in FIG. 11. Firstly, sewage enters a first electrocoagulation treatment assembly, polar plates are made of aluminum, and the distance between the polar plates is within the range of 5mm-6 mm. A DC voltage of 350V is applied, and the output DC current is 40A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 70 litres/m/h. The intermediate treated water treated by the first electrocoagulation treating component enters an air floatation and sedimentation component for separation, scum removal and settled intermediate treated water (clear liquid) enters a second electrocoagulation treating component, the polar plates are made of iron, and the distance between the polar plates is within the range of 5mm-6 mm. 270V DC voltage was applied and the output DC current was 64A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (i.e. the flow rate of the contaminated water over the surface of the plates) was 115 litres per square metre per hour. And the scum and the sediment enter a membrane filter press component for filtration treatment, and the intermediate treatment water after the membrane filter pressing treatment enters a water storage tank and then enters a second electrocoagulation treatment component from the water storage tank.
The treated water treated by the second electrocoagulation treatment component enters an air floatation and sedimentation component for separation, and the intermediate treated water (clear liquid) after scum removal and sedimentation enters an ultrafiltration membrane component for filtration treatment, so that treated water is obtained. And the scum and the sediment enter a membrane filter press component for filtration treatment, the intermediate treated water after the membrane filter pressing treatment enters a water storage tank, and then enters an ultrafiltration membrane component from the water storage tank for filtration treatment, so that treated water is obtained. The sewage is treated from turbid light white to clear and transparent treated water. The results of the sewage treatment are shown in Table 9.
Table 9 table of experimental results of example 5
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| COD(Cr) | 500 | mg/L | 130 | 90 | 30.8％ |
| Nickel (II) | 0.1 | mg/L | 20.7 | 0.03 | 99.85％ |
| Cyanide compounds | 0.5 | mg/L | 2.3 | 0.25 | 88.89％ |
As can be seen from Table 9, the treated water after treatment by the sewage treatment system meets the discharge standard. The original technology used in Shanghai electroplating plants is chemical oxidation and chemical flocculation, and the treatment cost (including various chemical agents and power consumption) of each ton of sewage is about 30 yuan. The treatment cost of each ton of sewage is about 5.5 yuan by adopting the embodiment. Therefore, compared with the original treatment process (chemical oxidation and chemical flocculation), the cost can be reduced by 81.67 percent.
Example 6
The wastewater treatment system shown in FIG. 11 was used to treat nickel-containing wastewater from a certain electroplating plant in the Shanghai, as shown in FIG. 12A. The process parameters for each component were the same as in example 5. The treated water is shown in FIG. 12B. As can be seen from FIGS. 12A and 12B, the wastewater was treated from a black turbid state to a clear and transparent treated water. The sewage treatment results are shown in Table 10.
Table 10 table of experimental results of example 6
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| COD(Cr) | 500 | mg/L | 550 | 109 | 80.2％ |
| Nickel (II) | 0.1 | mg/L | 62.3 | 0.012 | 99.98％ |
As can be seen from Table 10, the treated water after treatment by the sewage treatment system meets the discharge standard. The original technology used in Shanghai electroplating plants is chemical oxidation and chemical flocculation, and the treatment cost (including various chemical agents, power consumption and the like) of each ton of sewage is about 40-50 yuan. The treatment cost of each ton of sewage is about 6-7 yuan by adopting the embodiment. Therefore, compared with the original treatment process (chemical oxidation and chemical flocculation), the cost can be reduced by 85-88%.
Example 7
A wastewater treatment system as shown in FIG. 13 was used to treat nickel-containing wastewater from a certain plating plant in the Shanghai. The sewage enters a first electrocoagulation treatment assembly, the polar plates are made of iron, and the distance between the polar plates is within the range of 5mm-6 mm. A DC voltage of 300V was applied to the resultant, and the output DC current was 24A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 120 litres/m/h. The intermediate treated water treated by the first electrocoagulation treating component enters a precipitation component for separation, the intermediate treated water (clear liquid) after precipitation is removed enters a second electrocoagulation treating component, the polar plates are made of aluminum, and the distance between the polar plates is within the range of 5mm-6 mm. A DC voltage of 300V was applied to the resultant, and the output DC current was 21A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 120 litres/m/h. And the precipitate enters a membrane filter press component for filtration treatment, and the intermediate treatment water after the membrane filter pressing treatment enters a water storage tank and then enters a second electrocoagulation treatment component from the water storage tank.
The treated water treated by the second electrocoagulation treatment component enters a precipitation component for separation, the intermediate treated water (clear liquid) after precipitation is removed enters a third electrocoagulation treatment component, the polar plates are made of iron, and the distance between the polar plates is within the range of 5mm-6 mm. A DC voltage of 300V was applied to the resultant, and the output DC current was 19A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 120 litres/m/h. The precipitate enters a membrane filter press component for filtration treatment, and the intermediate treated water after the membrane filter pressing treatment enters a water storage tank and then enters a third electrocoagulation treatment component from the water storage tank.
And the treated water treated by the third electrocoagulation treating component enters a precipitation component for separation, and the intermediate treated water (clear liquid) after precipitation is removed enters an ultrafiltration membrane component for filtration treatment to obtain treated water. And (3) the precipitate enters a membrane filter press component for filtration treatment, the intermediate treated water after the membrane filter pressing treatment enters a water storage tank, and then enters an ultrafiltration membrane component from the water storage tank for filtration treatment, so that treated water is obtained. The sewage is treated from light green to clear and transparent treated water. The results of the sewage treatment are shown in Table 11.
Table 11 table of experimental results of example 7
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| Nickel (II) | 0.1 | mg/L | 62 | 0.03 | 99.95％ |
As can be seen from Table 11, the treated water after treatment by the sewage treatment system meets the discharge standard.
Example 8
Chromium-containing sewage from a certain electroplating plant in the Shanghai was treated by using the sewage treatment system shown in FIG. 14. Firstly, sewage enters an electrocoagulation treatment assembly, pole plates are made of iron, and the distance between the pole plates is within the range of 5mm-6 mm. The 350V DC voltage is applied, and the output DC current is 38A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 90 litres/m/h. The treated water treated by the electrocoagulation treating component enters an air floatation and sedimentation component for separation, and intermediate treated water (clear liquid) after scum removal and sedimentation enters an ultrafiltration membrane component for filtration treatment to obtain treated water. And the scum and the sediment enter a membrane filter press component for filtration treatment, the intermediate treated water after the membrane filter pressing treatment enters a water storage tank, and then enters an ultrafiltration membrane component from the water storage tank for filtration treatment, so that treated water is obtained. The sewage is treated from brown to clear and transparent treated water. The sewage treatment results are shown in Table 12.
Table 12 table of experimental results of example 8
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| Total chromium | 0.5 | mg/L | 256 | 0.06 | 99.98％ |
| Hexavalent chromium | 0.1 | mg/ |
115 | 0.01 | 99.99％ |
As can be seen from Table 12, the treated water after treatment by the sewage treatment system meets the discharge standard.
Example 9
The sewage treatment system shown in FIG. 15 was used to treat the mining sewage of a lithium mine in Jiangxi province. Separating sewage in a precipitation assembly, removing the precipitate, and allowing the clear liquid to enter an electrocoagulation treatment assembly, wherein the polar plates are made of iron, and the distance between the polar plates is within the range of 5-6 mm. The DC voltage of 140V-200V is applied, and the output DC current is 90A-100A. The ratio of the flow rate of sewage to the sum of the surface areas of the array of plates (or the flow rate of sewage at the surface of the plates) is 130 l/m/h. The precipitate enters a membrane filter press component for filtration treatment, and the intermediate treatment water after the membrane filter pressing treatment enters a water storage tank and then enters an electrocoagulation treatment component from the water storage tank.
The intermediate treated water treated by the electrocoagulation treating component enters a precipitation component for separation, and the intermediate treated water (clear liquid) after the precipitation is removed enters an ultrafiltration membrane component for filtration treatment to obtain treated water. And (3) enabling the precipitate to enter a membrane filter press component for filtering treatment, enabling the intermediate treated water subjected to membrane filter pressing treatment to enter a water storage tank, and enabling the intermediate treated water to enter an ultrafiltration membrane component from the water storage tank for filtering treatment to obtain treated water. The sewage is treated from light yellow to be clear and transparent treated water. The results of the sewage treatment are shown in Table 13.
Table 13 table of experimental results of example 9
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| COD(Cr) | 500 | mg/L | 200 | 140 | 30％ |
| Total phosphorus | 8 | mg/L | 3.9 | 0.37 | 90.5％ |
| Ammonia | 50 | mg/L | 35.6 | 2.73 | 92.33％ |
| Thallium | 0.005 | mg/L | 0.056 | 0.003 | 94.64％ |
As can be seen from Table 13, the treated water after treatment by the sewage treatment system meets the discharge standard.
Comparative example 1
The sewage of example 9 was treated, which was different from example 9 in that the inter-plate distance was in the range of 13mm to 14mm, and the output direct current was 181A. The sewage treatment results are shown in Table 13-1.
Table 13-1 table of experimental results of comparative example 1
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate of |
| Thallium | 0.005 | mg/L | 0.056 | 0.022 | 60.7％ |
As can be seen from Table 13-1, the treated water treated by the sewage treatment system of comparative example 1 did not meet the discharge standard.
Comparative example 2
The wastewater of example 9 was treated, which was different from example 9 in that the plate pitch was in the range of 3mm to 4 mm. A DC voltage of 55V was applied to the resultant, and a DC current of 29A was outputted. The sewage treatment results are shown in Table 13-2.
Table 13-2 table of experimental results of comparative example 2
| Item | Emission limit | Unit | Waste water | After treatment | Removal rate |
| Thallium | 0.005 | mg/L | 0.056 | 0.035 | 37.5％ |
As can be seen from Table 13-2, the treated water treated by the sewage treatment system of comparative example 2 did not meet the discharge standard.
Example 10
The sewage treatment system shown in figure 16 is used for treating dyeing sewage in Zhejiang. The sewage enters a first electrocoagulation treatment assembly, the polar plates are made of iron, and the distance between the polar plates is within the range of 3-4 mm. A DC voltage of 370V was applied, and the output DC current was 48A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 85 litres/m/h. The treated water treated by the first electrocoagulation treating component enters an air floatation component for separation, the intermediate treated water (clear liquid) after scum removal enters a second electrocoagulation treating component, the polar plates are made of aluminum, and the distance between the polar plates is within the range of 3mm-4 mm. A DC voltage of 350V was applied to the resultant, and the output DC current was 43A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 130 litres/m/h. The scum enters a membrane filter press component for filtering treatment, the intermediate treatment water after the membrane filter pressing treatment enters a water storage tank, and then enters a second electrocoagulation treatment component from the water storage tank.
The treated water treated by the second electrocoagulation treating component enters the air flotation component for separation, and the intermediate treated water (clear liquid) after scum removal enters the membrane bioreactor component for treatment (membrane separation and biological treatment). The scum enters a membrane filter press component for filtration treatment, and the intermediate treatment water after the membrane filter press treatment enters a membrane bioreactor component for treatment (membrane separation and biological treatment).
The intermediate treated water treated by the membrane bioreactor component enters an ultrafiltration membrane component for filtration treatment to obtain treated water. The sewage treatment results are shown in Table 14.
Table 14 table of experimental results of example 10
As can be seen from Table 14, the treated water after treatment by the sewage treatment system meets the indirect discharge standard.
Example 11
A waste water treatment system as shown in figure 17 was used to treat shaoxing certain printing and dyeing waste water. The wastewater is shown in FIG. 18A. Firstly, sewage enters an electrocoagulation treatment assembly, the polar plates are made of aluminum, and the distance between the polar plates is within the range of 7mm-9 mm. A DC voltage of 400V was applied to the substrate, and the output DC current was 45A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 120 litres/m/h. The treated water treated by the electrocoagulation treating component enters the air flotation component for separation, and the intermediate treated water (clear liquid) after scum removal enters the membrane bioreactor component for treatment (membrane separation and biological treatment). The scum enters a membrane filter press component for filtration treatment, and the intermediate treated water after the membrane filter pressing treatment enters a membrane bioreactor component for treatment (membrane separation and biological treatment).
And the intermediate treated water treated by the membrane bioreactor component enters an ultrafiltration membrane component for filtration treatment to obtain treated water. The treated water is shown in FIG. 18B. As can be seen from fig. 18A and 18B, the wastewater is treated from black to clear and transparent treated water. The results of the sewage treatment are shown in Table 15.
Table 15 table of experimental results of example 11
| Item | Emission limit | Unit of | Waste water | After treatment | Removal rate |
| COD(Cr) | 200 | mg/L | 1390 | 178 | 87.2％ |
As can be seen from Table 15, the treated water after treatment by the sewage treatment system meets the discharge standard.
Example 12
The sewage treatment system shown in figure 17 is used for treating the dyeing sewage of Nantong. Firstly, the sewage enters an electrocoagulation treatment assembly, the polar plates are made of iron, and the distance between the polar plates is within the range of 8mm-10 mm. The DC voltage of 500V-550V is applied, and the output DC current is 25A-26A. The ratio of the flow rate of the contaminated water to the sum of the surface areas of the array of plates (or the flow rate of the contaminated water over the surface of the plates) was 285 litres/m/hr. The treated water treated by the electrocoagulation treatment component enters the air floatation component for separation, and the intermediate treated water (clear liquid) after scum removal enters the membrane bioreactor component for treatment (membrane separation and biological treatment). The scum enters a membrane filter press component for filtration treatment, and the intermediate treated water after the membrane filter pressing treatment enters a membrane bioreactor component for treatment (membrane separation and biological treatment).
And the intermediate treated water treated by the membrane bioreactor component enters an ultrafiltration membrane component for filtration treatment to obtain treated water. The sewage is treated from black to clear and transparent treated water. The results of the sewage treatment are shown in Table 16.
Table 16 table of experimental results of example 12
| Item | Emission limit | Unit | Waste water | After treatment | Removal rate |
| COD(Cr) | 200 | mg/L | 382 | 63 | 83.5％ |
As can be seen from Table 16, the treated water after treatment by the sewage treatment system meets the discharge standard.
Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be regarded as illustrative only and not as limiting the present specification. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present specification and thus fall within the spirit and scope of the exemplary embodiments of the present specification.
Also, the description uses specific words to describe embodiments of the description. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the specification is included. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the specification may be combined as appropriate.
Additionally, the order in which the elements and sequences of the process are recited in the specification, the use of alphanumeric characters, or other designations, is not intended to limit the order in which the processes and methods of the specification occur, unless otherwise specified in the claims. While various presently contemplated embodiments of the invention have been discussed in the foregoing disclosure by way of example, it is to be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.
Similarly, it should be noted that in the preceding description of embodiments of the present specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features than are expressly recited in a claim. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.
Where numerals describing the number of components, attributes or the like are used in some embodiments, it is to be understood that such numerals used in the description of the embodiments are modified in some instances by the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters set forth in the specification and claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.
For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this specification, the entire contents of each are hereby incorporated by reference into this specification. Except where the application history document is inconsistent or contrary to the present specification, and except where the application history document is inconsistent or contrary to the present specification, the application history document is not inconsistent or contrary to the present specification, but is to be read in the broadest scope of the present claims (either currently or hereafter added to the present specification). It is to be understood that the descriptions, definitions and/or uses of terms in the accompanying materials of this specification shall control if they are inconsistent or contrary to the descriptions and/or uses of terms in this specification.
Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments described herein. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the present specification can be seen as consistent with the teachings of the present specification. Accordingly, the embodiments of the present description are not limited to only those embodiments explicitly described and depicted herein.
Claims (10)
1. A wastewater treatment system, comprising an electrocoagulation treatment assembly, the electrocoagulation treatment assembly comprising:
a tank comprising a water inlet and an overflow outlet; and
at least two pole plates, wherein,
the at least two polar plates are arranged in the box body;
the at least two polar plates are made of the same material;
and two polar plates positioned at the end parts of the at least two polar plates are connected with a power supply.
2. The wastewater treatment system according to claim 1,
the at least two polar plates are arranged in the box body at a preset distance, wherein the preset distance is within the range of 3mm-10 mm.
3. The wastewater treatment system according to claim 1,
the material comprises at least one of iron, aluminum or steel.
4. The wastewater treatment system according to claim 1,
the system further comprises an air flotation and sedimentation assembly for removing scum and sediment from the wastewater or intermediate treated water, wherein,
the air floatation and sedimentation assembly is communicated with the overflow outlet so that the treated water treated by the electrocoagulation treatment assembly enters the air floatation and sedimentation assembly, and/or
The air flotation and precipitation assembly is communicated with the water inlet so that the treated water treated by the air flotation and precipitation assembly enters the electrocoagulation treating assembly.
5. The wastewater treatment system according to claim 1,
the system includes an air flotation assembly for removing scum from the wastewater or intermediate treatment water, wherein,
the air floatation assembly is communicated with the overflow outlet so that the treated water treated by the electrocoagulation treatment assembly enters the air floatation assembly, and/or
The air floatation assembly is communicated with the water inlet so that the treated water treated by the air floatation assembly enters the electrocoagulation treating assembly.
6. The wastewater treatment system according to claim 1,
the system includes a sedimentation assembly for removing sediment from the wastewater or intermediate treatment water, wherein,
the settling assembly is communicated with the overflow outlet so that the treated water treated by the electrocoagulation treating assembly enters the settling assembly, and/or
The settling assembly is communicated with the water inlet so that the treated water treated by the settling assembly enters the electrocoagulation treating assembly.
7. The wastewater treatment system according to any of claims 4 to 6,
the system further comprises a filtering assembly, the filtering assembly is communicated with a water outlet of one of the air floatation and precipitation assembly, the air floatation assembly or the precipitation assembly, and the filtering assembly comprises an ultrafiltration membrane.
8. A method of treating wastewater, the method comprising:
treating the wastewater with the wastewater treatment system according to claim 1 to obtain treated water.
9. The wastewater treatment method according to claim 8, further comprising:
controlling the wastewater to enter the electrocoagulation treatment assembly at a preset flow rate, wherein,
the ratio of the preset flow velocity to the sum of the surface areas of the at least two polar plates is 50L/m 2 ˙h-300L/m 2 And in the h range.
10. The wastewater treatment method according to claim 8, further comprising:
and controlling the power supply voltage of the power supply to be in the range of 140V-550V.
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| PCT/CN2022/126761 WO2023078105A1 (en) | 2021-11-08 | 2022-10-21 | Sewage treatment system and method |
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| CN202210733915.8A Pending CN115028297A (en) | 2021-11-08 | 2022-06-27 | Sewage treatment system and method |
Country Status (2)
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| CN (1) | CN115028297A (en) |
| WO (1) | WO2023078105A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023078105A1 (en) * | 2021-11-08 | 2023-05-11 | 上海特瑞思材料科技有限公司 | Sewage treatment system and method |
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