Water treatment device and water treatment method based on charged discharge convex electrode assembly

Abstract

The invention relates to a water treatment device and a water treatment method based on a charged discharge convex electrode assembly. A pretreatment unit of the water treatment device comprises a pretreatment pool, a biochemical treatment unit comprises an oxidation pool, electrode assemblies are arranged in the pretreatment pool and the oxidation pool, each electrode assembly is provided with two electrode plates which are oppositely arranged, discharge protrusions are arranged on the discharge side surfaces of the electrode plates, and the discharge protrusions are of a mushroom head structure. According to the water treatment method, pollutants in water are removed through the water treatment device, iron ions are released through the electrode assembly in the aerobic tank, an iron ion environment beneficial to growth and metabolism of aerobic microbiota is formed, and the distance between the electrode plates in the electrode assembly is set or adjusted according to the water flow of inlet water or the pollutant flow. According to the electrode assembly, the requirement for discharge voltage can be lowered under the condition that large discharge current is kept, then the preparation cost and the operation cost are lowered, and scaling after positive electrode and negative electrode guiding can be separated easily.

Description

Technical Field

[0001] The present invention relates to an electrode assembly provided with discharge protrusions and a water treatment device using such an electrode assembly. Background Art

[0002] Water treatment devices such as electrocoagulation reactors need to be equipped with electrode assemblies. Among them, electrocoagulation uses a metal plate as the anode. Under the action of direct current, the anode is corroded, generating a large number of metal cations. After a series of coagulation and flocculation processes, larger flocs are formed, causing colloidal impurities and suspended impurities in the wastewater to coagulate and precipitate for separation. Currently, the electrode assemblies used for water treatment usually adopt two parallel plate-shaped electrodes (which can be called electrode plates), which are connected and fixed through a fixed connection structure. For example, Chinese patent document CN111573915A discloses a sewage treatment device and a sewage treatment system based on electrochemical oxidation and ultrafiltration. The sewage treatment device includes an electrode ultrafiltration assembly, and the electrode ultrafiltration assembly includes a positive main electrode plate, a negative main electrode plate, an insulating mesh box, and a flat ceramic membrane element; the positive main electrode plate and the negative main electrode plate are arranged in parallel, an insulating mesh box is arranged in parallel at intervals between the positive main electrode plate and the negative main electrode plate, and particle electrodes are filled in the insulating mesh box; flat ceramic membrane elements are arranged between the positive main electrode plate and the insulating mesh box, between the negative main electrode plate and the insulating mesh box, and between adjacent insulating mesh boxes; the positive main electrode plate is used to connect the positive pole of the power supply, and the negative main electrode plate is used to connect the negative pole of the power supply; the water production pipe at one end of the flat ceramic membrane element is used to connect the self-priming pump. Chinese patent document CN118561378A discloses a double-pulse internal aeration type electro-Fenton device, which relates to the technical field of sewage treatment equipment and includes: an electrolytic cell, in which a plurality of cathode plates and anode plates are arranged at intervals, water inlets and outlets are respectively arranged at two diagonal positions of the electrolytic cell, the cathode plate includes a plurality of small cathode plates, and the small cathode plates are spliced on the same plane, and the small cathode plates are of a hollow honeycomb plate structure; a power supply system, the positive pole is respectively connected to the anode plate, and the negative pole of the power supply system is respectively connected to each small cathode plate through a pulse switch; an aeration system, which is respectively connected to each small cathode plate; a control system, which is connected to the power supply system and the aeration system for control. Chinese patent document CN116282401A discloses an electro-dehydration device that combines electrocoalescence and electrocoagulation, including a tank body, in which a straight plate electrode assembly, an oil collecting pipe, an oil distribution pipe, and a water outlet pipe are installed. The straight plate electrode assembly includes three layers of horizontal plate electrodes. A flat water tank is arranged at the bottom of the tank body, and the flat water tank is used to pre-form a water layer inside the tank body before the oil distribution pipe starts to distribute oil. An electrocoagulation electrode plate assembly is fixedly arranged between the bottom surface of the flat water tank and the oil distribution pipe; it applies a high-frequency pulsed electric field by means of the straight plate electrode, and through the arrangement of electrodes with different spacings, the coalescence rate of water droplets is increased. A water layer with a certain thickness is pre-formed in the bottom water tank of the tank, and the water in the water tank is treated by electrocoagulation, coupling electrocoalescence and electrocoagulation. Since the discharge part of such electrode plates is planar, the voltage requirement is high, and the preparation cost and operation cost of the power supply used are both relatively high.

[0003] On the other hand, electrocoagulation, as a common method for sewage treatment, has its own advantages compared with biochemical treatment methods. Combining the two can achieve better treatment effects and better meet the requirements of advanced treatment. Summary of the Invention

[0004] The object of the present invention is to reduce the voltage requirement for the discharge of the electrode assembly, so as to better adapt to the actual needs of the corresponding water treatment device.

[0005] The technical solution of the present invention is: based on a water treatment device with a discharge convex electrode assembly, there is a biochemical treatment unit and a pretreatment unit located in front of the biochemical treatment unit. The pretreatment unit includes a pretreatment tank, and an electrode assembly is provided in the pretreatment tank. The electrode assembly has two electrode plates arranged oppositely, and a discharge convex (a protruding structure for discharging) is provided on the discharge side surface of the electrode plate. There is a gap between the discharge convex on any one electrode plate and the other electrode plate (including the discharge convex on the other electrode plate).

[0006] The way the effluent of the pretreatment unit is connected to the biochemical treatment unit can be directly connected to the biochemical treatment unit or connected to the biochemical treatment unit through one or more other treatment units (treatment units located between the pretreatment unit and the biochemical treatment unit).

[0007] The pretreatment unit is composed of a pretreatment tank, or includes a pretreatment tank and other supporting facilities.

[0008] The number of the pretreatment tanks is usually one, and when necessary, it can also be multiple. Multiple pretreatment tanks can be connected in series and / or in parallel according to actual needs.

[0009] The electrode assembly is located in the water space (the space with water during operation) in the tank. After being energized, it generates an electric current and releases iron ions. One or more electrode assemblies can be provided in the same pretreatment tank. When multiple electrode assemblies are provided, the multiple electrode assemblies can be arranged side by side and / or front and back in the tank according to actual needs.

[0010] The electrode assembly can be installed in the reactor (tank) by means of suspension or any other suitable means. For example, a suspension rod (hanging hook) that can be hung on the tank wall is provided on the electrode assembly, so that the installation, disassembly and replacement of the electrode assembly can be facilitated.

[0011] Preferably, the biochemical treatment unit includes an aerobic tank.

[0012] The electrode assembly described above may or may not be provided in the aerobic tank.

[0013] Preferably, suspended fillers are provided in the aerobic tank, and the suspended fillers in the aerobic tank are evenly distributed in part or all of the water space in the aerobic tank. The electrode assembly in the aerobic tank can be a fixed (with fixed electrode spacing) electrode assembly or an electrode assembly with adjustable electrode spacing (or adjustable electrode plate spacing).

[0014] An aeration device can be provided at the bottom in the aerobic tank.

[0015] The biochemical treatment unit is provided with an anoxic tank. The anoxic tank is in the front of the aerobic tank in the same biochemical treatment unit, and its effluent is connected (directly connected or connected through other treatment tanks) to the aerobic tank in the same biochemical treatment unit.

[0016] Suspended packing can be provided or not provided in the anoxic tank.

[0017] When suspended packing is provided in the anoxic tank, the suspended packing in the anoxic tank is evenly distributed in part or all of the water space in the anoxic tank.

[0018] The suspended packing can be composed of several packing monomers. The packing monomers are connected (rigidly connected or flexibly connected, for example, bonded, clamped, or connected by a flexible rope) to a three-dimensional packing rack, thereby forming a suspended-like spatial distribution state.

[0019] The packing rack adopts any form that can make the packing monomers connected to the packing rack evenly distributed (the distribution in any of the three directions of up and down, left and right, and front and back is uniform / roughly uniform) in the corresponding water space. For example, a corresponding three-dimensional grid rack. The packing monomers are connected to the packing rack according to the evenly distributed manner.

[0020] Preferably, the packing rack is provided with a rigid (hard) three-dimensional frame, and several layers of plane grids (grid structures) are arranged at intervals up and down on the three-dimensional frame. The packing monomers are respectively connected to the grid intersection points of each layer of plane grids, and gaps are left between the packing monomers, thereby realizing the fixation and support of each packing monomer through the packing rack.

[0021] Preferably, the plane grid adopts a moderately tightened flexible grid. Cross bars for connecting the side edges of the plane grid can be provided on the three-dimensional frame, and the side edges of the plane grid are respectively connected to the corresponding cross bars. Thus, the packing monomers installed on the plane grid can have a certain degree of movement under the action of water flow, which is beneficial for more fully mixing with water and sludge renewal.

[0022] The number of the biochemical treatment units is one or more, and multiple biochemical treatment units are connected in sequence (or connected in turn) front and back to form a multi-cycle treatment under the structure of multiple biochemical treatment units.

[0023] For example, the number of the biochemical treatment units is two, including a first biochemical treatment unit and a second biochemical treatment unit. The first biochemical treatment unit includes a first anoxic tank, an anaerobic tank (or the first anaerobic tank), and a first aerobic tank that are connected in sequence. The first anoxic tank, the anaerobic tank, and the first aerobic tank are connected in sequence (the effluent of the previous tank / unit is introduced into the subsequent tank / unit). The second biochemical treatment unit includes a second anoxic tank and a second aerobic tank that are connected in sequence. The second anoxic tank and the second aerobic tank are connected in sequence. The effluent of the first aerobic tank is introduced into the second anoxic tank.

[0024] According to actual conditions and requirements, an aeration device may or may not be provided at the bottom of the anoxic tank (including a single anoxic tank, or the first anoxic tank and the second anoxic tank).

[0025] Packing may or may not be provided in the anaerobic tank.

[0026] The packing in the anaerobic tank may be suspended packing or stacked packing.

[0027] Preferably, the effluent of the secondary sedimentation tank is introduced into the clear water tank in an overflow manner.

[0028] Preferably, the number of discharge protrusions on the same electrode plate (on the discharge side of the same electrode plate) is multiple, and there is a spacing between each discharge protrusion.

[0029] Generally, any suitable regular distribution method can be adopted. For example, a horizontal and vertical arrangement distribution method can be adopted. For example, the discharge protrusions on the same horizontal (horizontal direction) are equally spaced, and the discharge protrusions on the same vertical (up and down direction on the discharge side surface of the electrode plate) are equally spaced. When necessary, a distribution method with different densities in different parts can also be adopted.

[0030] For example, the discharge protrusions can be arranged in multiple rows in the up and down (vertical) direction. The setting density of the mushroom heads on each row (or the spacing between adjacent mushroom heads) can be the same or different; the spacing between adjacent rows can be the same or different, and can be specifically set according to the discharge requirements.

[0031] Preferably, the discharge side of the discharge protrusion adopts a mushroom head structure (a rotating curved surface structure protruding from the middle towards the other electrode plate, such as a spherical crown structure or an ellipsoidal crown structure).

[0032] Preferably, the installation method of the discharge protrusion on the electrode plate is detachable connection, for example, threaded connection. Threaded holes can be provided on the discharge side of the electrode plate, and the discharge protrusion is screwed onto the corresponding threaded hole through the thread (screw rod structure) at the tail of the discharge protrusion (the electrode plate connection side).

[0033] Preferably, the discharge projection is provided with a connecting column, the outer end (end portion, or head end) of the connecting column is connected to a mushroom head structure, and the inner end (or tail end) is connected to an electrode plate.

[0034] Furthermore, an external thread is provided at the tail of the connecting column, and it is threadedly connected to a screw hole on the discharge side surface of the electrode plate.

[0035] The head of the connecting column preferably adopts a straight prism (e.g., regular hexagonal prism, quadrangular prism, etc.) structure, and a corresponding wrench can be used to hold the prism structure and rotate it to achieve the installation and disassembly of the discharge projection on the electrode plate.

[0036] In the above situation, according to the distribution mode of the discharge projections, screw holes (which can be blind holes or through holes) for installing the discharge projections are provided on the discharge side surface of the electrode plate.

[0037] Preferably, the main body parts of the two electrode plates are in a flat plate shape, arranged parallel to each other or in a wedge shape (or relatively inclined), and the relative arrangement mode of the main body parts of the two electrode plates (e.g., arranged parallel to each other or in a wedge shape) can be regarded as / called the relative arrangement mode of the two electrode plates. Thus, from the spatial distribution mode of the two electrode plates, the electrode assembly can be divided into an electrode assembly with the electrode plates arranged parallel and an electrode assembly with the electrode plates arranged in a wedge shape.

[0038] In the wedge-shaped arrangement, the gap between the two electrode plates (main body parts) is in a wedge shape (trapezoid) with the bottom larger and the top smaller, and the spacing between each part at the same height is equal.

[0039] Furthermore, the connection mode between the two electrode plates can be a fixed connection or a connection with adjustable spacing, thereby respectively forming a fixed electrode assembly and an electrode assembly with adjustable spacing.

[0040] Any suitable form of the prior art can be used to achieve the fixed connection and the connection with adjustable spacing between the electrode plates. For example, for the connection with adjustable spacing, a connection mode that allows one or two electrode plates to change their positions in a direction perpendicular to the electrode plates can be adopted. For example, they are connected through a linear guiding mechanism in the corresponding direction and are provided with a position locking device.

[0041] Furthermore, the two electrode plates (the two electrode plates of the same electrode assembly) can be connected in any of the following ways: 1) There are an upper plate and a lower plate for fixedly installing electrode plates. The electrode plates are located between the upper plate and the lower plate, and their tops and bottoms are respectively fastened to the upper plate and the lower plate by fastening bolts. Both the upper plate and the lower plate are provided with distance-adjusting mounting holes for passing the corresponding fastening bolts. The distance-adjusting mounting holes are strip-shaped holes with the length direction perpendicular to the electrode plates (the plate surfaces of the electrode plates), allowing the corresponding fastening bolts to pass through different positions of the strip-shaped holes. Thus, the distance between the two electrode plates can be changed by changing the positions of the fastening bolts in the corresponding distance-adjusting mounting holes; 2) The two electrode plates are fixedly connected together by a number of distance-adjusting fixing bolts. The two electrode plates are provided with a plurality of through holes corresponding to each other for fixed connection. The two ends of the distance-adjusting fixing bolts respectively pass through the corresponding through holes on the two electrode plates, and clamping nut assemblies for clamping the corresponding electrode plates are provided. The clamping nut assemblies include inner clamping nuts located inside the corresponding electrode plates and outer clamping nuts located outside the corresponding electrode plates. The corresponding inner clamping nuts and outer clamping nuts clamp the electrode plates on the corresponding sides. Thus, the distance between the two electrode plates can be changed by changing the positions of the clamping nut assemblies on the distance-adjusting fixing bolts; 3) A spacer is arranged between the two electrode plates in the electrode assembly. The electrode plates and the spacer are provided with a number of corresponding through holes and are fastened together by clamping bolts passing through the corresponding through holes. Thus, the distance between the two electrode plates can be changed by changing the total thickness of the spacer.

[0042] Preferably, in the above first connection method (there are an upper plate and a lower plate for fixedly installing electrode plates, and the electrode plates are located between the upper plate and the lower plate), the two distance-adjusting mounting holes on the same side of the upper plate (the two distance-adjusting mounting holes for passing the top fastening bolts of the two electrode plates on the same side) can be connected into (or said to adopt) a long strip-shaped hole (a long distance-adjusting mounting hole); similarly, the two distance-adjusting mounting holes on the same side of the lower plate (the two distance-adjusting mounting holes for passing the bottom fastening bolts of the two electrode plates on the same side) can be connected into (or said to adopt) a long strip-shaped hole (a long distance-adjusting mounting hole). This not only facilitates the processing of the upper and lower plates, but also facilitates the installation and adjustment of the electrode plates; Preferably, in the above third connection method (a spacer is arranged between the two electrode plates, and the electrode plates and the spacer are provided with a number of corresponding through holes and are fastened together by clamping bolts passing through the corresponding through holes), a fixing plate is also provided. The spacer is only arranged in the upper part between the two electrode plates. The lower parts of the two electrodes respectively pass through two insertion holes on the fixing plate and extend below the fixing plate. The bottom of the spacer supports on the fixing plate between the two insertion holes. The width of the insertion holes is greater than the width of the electrode plates, so that the relative position distribution between the two insertion holes and the width of the two insertion holes are adapted to the adjustment range of the electrode distance (the position change range between the two electrode plates).

[0043] Preferably, the number of backing plates located between the two electrode plates is one or more, whereby the total thickness of the backing plates can be changed by changing the thickness of a single backing plate and / or by changing the number of backing plates.

[0044] Preferably, the top of the middle backing plate is higher than the tops of the electrode plates and other backing plates (if any), and through holes for hanging or holding, etc. may or may not be provided.

[0045] A water treatment method, using any of the water treatment devices disclosed in the present invention to remove (purify) pollutants in water. The biochemical treatment unit includes an aerobic tank, and the electrode assembly as described above is provided in the aerobic tank. By releasing iron ions through the electrode assembly, an iron ion environment conducive to the growth and metabolism of aerobic microbial populations is formed, thereby improving the aerobic biochemical reaction ability of the aerobic tank and / or enhancing the intensity of the aerobic biochemical reaction in the aerobic tank. The electrode assembly in the aerobic tank is a fixed electrode assembly or an electrode assembly with adjustable electrode spacing.

[0046] Preferably, the connection mode between the two electrode plates in the electrode assembly is a connection with adjustable spacing (adjustable electrode plate spacing), and the electrode plate spacing in the electrode assembly is set or adjusted according to the water flow rate or pollutant flow rate of the influent water.

[0047] The electrode assembly preferably adopts an electrode assembly with adjustable electrode plate spacing.

[0048] The electrode assembly preferably adopts an electrode assembly with wedge-shaped electrode plates.

[0049] For any treatment tank provided with an electrode assembly with adjustable electrode spacing (for example, a pretreatment tank or an aerobic tank provided with an electrode assembly with adjustable electrode spacing), the electrode plate spacing (the distance between the two electrode plates) in the electrode assembly can be set or adjusted according to the water flow rate or pollutant flow rate of the influent water (the influent water of this treatment tank) so that the electrode plate spacing in the electrode assembly meets the treatment requirements.

[0050] In the case of adjusting the electrode plate spacing according to the pollutant flow rate, the specific pollutant types and flow rate calculation methods to be included in the pollutant flow rate are selected according to the treatment requirements. When multiple pollutants should be included, the inclusion weights (weight coefficients) of each pollutant can be determined according to the ratio of the concentration of each corresponding pollutant in the influent water to the upper limit of the discharge standard (treatment requirements) of each pollutant.

[0051] The adjustment of the electrode plate spacing can be hierarchical adjustment. For example, the flow rate (water flow rate or pollutant flow rate) ranges (upper and lower limits) corresponding to each level of electrode plate spacing can be set, and the adjustment period (or calculation period, for example, several hours) of the set spacing can be set. If the expected flow rate (total flow rate within the period, or equivalently, average flow rate within the period) of the next adjustment period or the measured flow rate (total flow rate within the period, or equivalently, average flow rate within the period) of the current adjustment period is within the flow rate range corresponding to another (another level) of electrode plate spacing, then before the start of the next adjustment period (or at the start), the electrode plate spacing of the electrode assembly is adjusted to the corresponding electrode plate spacing or the electrode assembly is replaced with an electrode assembly having the corresponding electrode plate spacing.

[0052] Within any adjustment period, the current (or supply voltage) of the electrode assembly can be adjusted according to the change in the real-time (e.g., measured) flow rate (water flow rate or pollutant flow rate).

[0053] When the measured flow rate is far from the flow rate range corresponding to the real-time electrode plate spacing, the adjustment of the electrode plate spacing can be carried out in real time without waiting for the next adjustment period, and the starting point of the adjustment period is recalculated according to the actual adjustment time. For example, when the real-time flow rate reaches or exceeds the median value of the flow rate range corresponding to the electrode plate spacing of the level above the current electrode spacing (the level above the upper level) or the level below the current electrode spacing (the level below the lower level), the electrode spacing is adjusted to the electrode plate spacing of the level above or below the current electrode spacing to adapt to the large change in the flow rate and take into account the situation of too high short-term flow rate, avoiding overly frequent adjustment of the electrode spacing while ensuring the treatment effect.

[0054] The beneficial effects of the present invention are as follows: Since an adjustable-spacing connection method is adopted to achieve adjustable spacing between the electrode plates, the spacing between the electrode plates can be set or adjusted according to actual needs, and thus it can be better adapted to actual requirements. Since the two electrode plates can be arranged in parallel or in an inclined structure (wedge-shaped arrangement) according to actual needs, and can be provided with or provided with replaceable discharge protrusions, the inclined structure is beneficial to the shedding of scale on the electrode surface after the reversal of the positive and negative electrodes, is beneficial to the smoothness of the electrode plate surface, the reaction response between the positive and negative electrodes is clearer, is beneficial to more direct and stable reactions, and at the same time, due to the shedding and non-fouling of scale, it is beneficial to save useless power consumption. Since the holes for bolt fastening of the electrode plates on the upper plate and the lower plate can be set as elongated holes, or a clamping nut assembly screwed onto the distance-adjusting fixing bolt is used to set or adjust the positions of the two electrode plates on the distance-adjusting fixing bolt, or a spacer with variable total thickness is arranged between the two electrode plates, the spacing between the electrode plates can be adjusted steplessly (continuously) or stepwise (discontinuously) according to actual needs, and the operation is convenient and the fixation is reliable. Since suspension rods can be arranged at both ends of the upper plate or the fixing plate, the installation and disassembly of the electrode assembly on the reactor can be conveniently realized, and thus it is allowed to replace the electrode assembly with different electrode plate spacings during the water treatment process, and the adjustment of the electrode plate spacing will not have a negative impact on the treatment process. Since suspension rods with different lengths can be adopted according to actual needs, and the connection between the suspension rod and the reactor and the upper plate or the fixing plate is realized through the upper hook and the lower hook of the suspension rod respectively, the operation is convenient. Since the electrode assembly arranged in the aerobic tank can appropriately release iron ions (and electrons, etc.), the environmental conditions such as the iron ion concentration required by the aerobic microbial community can be formed, which helps to improve the aerobic biochemical reaction ability of the aerobic tank and / or enhance the aerobic biochemical reaction intensity of the aerobic tank. Since the aerobic tank and the anoxic tank can adopt suspended fillers, it helps to achieve the balanced distribution of activated sludge in the entire water space, helps to maintain the sludge activity, helps to reduce the resistance, and thus enhances the treatment effect.

[0055] The electrode assembly of the present invention can reduce the requirement for the discharge voltage while maintaining a large discharge current, thereby reducing the manufacturing cost and the operating cost, and helping to detach the scale after the orientation of the positive and negative electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 is a schematic diagram of the motor assembly related to the present invention under the wedge-shaped arrangement of the electrode plates; Figure 2 is a front view structural schematic diagram of a connection method of the electrode plates of the electrode assembly related to the present invention; Figure 3 is Figure 2 a side view structural schematic diagram of the illustrated embodiment; Figure 4 is Figure 2 a top view structural schematic diagram of the adjustable connection of the electrode plates in the illustrated embodiment; Figure 5 Is Figure 2 The bottom view structural schematic diagram of the adjustable connection of the electrode plate involved in the illustrated embodiment; Figure 6 Is the three-dimensional structural schematic diagram of another electrode plate connection method of the electrode assembly involved in the present invention; Figure 7 Is the front view structural schematic diagram of the third electrode plate connection method of the electrode assembly involved in the present invention; Figure 8 Is Figure 7 The side view structural schematic diagram of the illustrated embodiment; Figure 9 Is Figure 7 The side view structural schematic diagram of the adjustable connection of the electrode plate involved in the illustrated embodiment; Figure 10 Is Figure 7 The top view structural schematic diagram of the adjustable connection of the electrode plate involved in the illustrated embodiment; Figure 11 Is Figure 7 The top view structural schematic diagram of the fixing plate involved in the illustrated embodiment; Figure 12 Is the top view structural schematic diagram of an embodiment of the water treatment device involved in the present invention; Figure 13 Is Figure 12 The front view structural schematic diagram of the illustrated embodiment; Figure 14 Is the three-dimensional structural schematic diagram of the fourth electrode plate connection method of the electrode assembly involved in the present invention; Figure 15 Is the schematic diagram of the electrode top handle involved in the present invention.

[0057] Identifications in the figure: 10: Electrode plate; 11: Discharge convex; 12: Mushroom head; 13: Wiring terminal; 14: Through hole for fixed connection; 16: Wire threading hole; 18: Threaded hole; 20: Fixing plate; 21: Upper plate; 22: Lower plate; 23: Clamping bolt; 24: Spacing adjustment mounting hole; 25: Spacing adjustment fixing bolt; 26: Tightening bolt; 27: Insertion hole; 28: Through hole for connecting the hanging rod; 29: Clamping nut assembly; 30: Hanging rod; 33: Upper hook; 35: Lower hook; 39: Guide rail; 40: Base plate; 41: Top of the middle base plate; 46: Through hole for hanging or holding; 47: Hanging plate; 48: Bolt fixing hole; 49: Hanging hole; 103: Water inlet; 104: Air inlet; 105: Water outlet; 106: First electrode assembly; 107: Second electrode assembly; 108: Filler; 110: Pretreatment tank; 120: Anoxic tank; 130: Aerobic tank; 140: Sedimentation tank; 143: Overflow weir; 146: Mud discharge hopper; 150: Clear water tank. Detailed implementation manners

[0058] See Figures 1 to 15 In the electrode assembly with discharge protrusions, there are two electrode plates 10. One is used as the positive electrode and is connected to the positive pole of the DC power supply, and the other is used as the negative electrode and is connected to the negative pole of the DC power supply. The main parts of the two electrode plates are both plate-shaped and can be made of iron substrate or other suitable materials. A number of discharge protrusions 11 are provided on the discharge side surface of the main part. The two electrode plates are arranged parallel to each other or in a wedge shape, and the connection between the two electrode plates is realized through a connection structure with adjustable position, thus forming an electrode assembly with discharge protrusions.

[0059] Figures 2 to 5 In the shown embodiment, an upper plate 21 and a lower plate 22 for fixedly installing the electrode plates are provided. Both the upper plate and the lower plate are horizontal plates. A strip-shaped hole serving as an adjustable distance mounting hole 24 is provided on each of the left and right sides of the upper plate and the lower plate. The adjustable distance mounting holes on the upper plate and the lower plate correspond up and down. The two electrode plates are located between the upper plate and the lower plate. A vertical fastening bolt 26 is provided at each of the two sides of the top and bottom of the electrode plate. The fastening bolts at the two sides of the top and bottom of the same electrode plate respectively pass through different adjustable distance mounting holes on the upper plate and the lower plate, and the fastening nuts at the outer ends of the fastening bolts are tightened so as to tightly press on the upper plate (or the lower plate), and auxiliary parts such as washers can be set according to actual needs to fasten the electrode plate to the upper and lower plates together to form an integrally fixed electrode assembly. The position of the fastening bolts in the adjustable distance mounting holes can be set or adjusted according to actual needs, so as to set or change the distance between the two electrode plates.

[0060] Figure 6 In the shown embodiment, a plurality of through holes 14 for fixed connection are provided on the two electrode plates corresponding to each other. The two ends of a horizontal adjustable distance fixing bolt 25 respectively pass through the corresponding through holes of the corresponding electrode plates. Clamping nut assemblies 29 for clamping the electrode plates are provided at both ends of the adjustable distance fixing bolt. The clamping nut assemblies are composed of inner clamping nuts located inside the corresponding electrode plates and outer clamping nuts located outside the corresponding electrode plates. The corresponding electrode plates are clamped by the inner and outer clamping nuts to form an integral electrode assembly. The number of adjustable distance fixing bolts is multiple (for example, 4 or 6), and they should be evenly distributed to facilitate the stable fixation between the two electrode plates. The position of the clamping nut assemblies on the adjustable distance fixing bolts can be set or adjusted according to actual needs, and further the distance between the two electrode plates can be set or adjusted.

[0061] Figures 7 to 11In the illustrated embodiment, a spacer plate 40 is provided between the two electrode plates. The distance between the two electrode plates is set or adjusted by setting or adjusting the number / total thickness of the spacer plates. The thicknesses of the individual spacer plates can be the same or different. Among them, the thickness of the spacer plate in the middle can be relatively thick. For example, the thickness of this spacer plate can be set according to the minimum distance between the electrode plates. The thicknesses of the remaining spacer plates can be set in grades or can have a single thickness. By providing different numbers and / or different thicknesses of spacer plates between the two electrode plates, discontinuous adjustment of the distance between the electrode plates is achieved. The thickness of the spacer plate with the smallest thickness can be set according to the minimum adjustment range required for the distance. During use, the spacer plates are selected according to actual needs to determine the number and total thickness of the spacer plates.

[0062] The top 41 of the middle spacer plate (the spacer plate in the middle) can be higher than the tops of the other spacer plates and the electrode plates, and through holes 46 for hanging or holding by hand can be provided at the top of the middle spacer plate.

[0063] A number of corresponding through holes are provided on the electrode plates and the spacer plates. The clamping bolts 23 are passed through the corresponding through holes on all the electrode plates and the spacer plates. The two ends of the clamping bolts protrude from the two side electrode plates, and fastening nuts are screwed on to fasten all the electrode plates and the spacer plates together to form an electrode assembly.

[0064] The spacer plates can be provided only in the upper part between the two electrode plates. Another fixing plate 20 is provided. A strip-shaped hole serving as a plug-in hole 27 is provided on each of the left and right sides of the fixing plate. The two electrode plates are respectively inserted into the corresponding plug-in holes on the fixing plate from above. The lower end of the spacer plate presses on / supports the fixing plate between the two plug-in holes, thereby realizing the support of the fixing plate for the electrode assembly. A tightening bolt (not shown) and a threaded hole structure (a structure with a threaded hole) threadedly connected to the tightening bolt can be provided outside the two plug-in holes. For example, a nut fixedly connected (e.g., bonded) to the surface of the fixing plate (the surface of the fixing plate located outside the corresponding plug-in holes). The tightening bolt is screwed onto the corresponding threaded hole structure (the tightening bolt is perpendicular to the electrode plate). After the electrode assembly is inserted into the fixing plate, the tightening bolts on both sides are tightened so that the inner ends of the tightening bolts press against the outer side surface of the electrode plate (usually can press against the middle part of the electrode plate) to realize the fixation between the electrode assembly and the fixing plate.

[0065] The width of the plug-in holes can be appropriately set to adapt to the change in the distance between the electrode plates. There is a certain distance between the two plug-in holes to ensure that regardless of the distance between the two electrode plates, the fixing plate between the two plug-in holes will support under the spacer plate, which is beneficial to the overall stability and forms a limitation on the insertion depth of the electrode plates.

[0066] The installation of the electrode assembly on the reactor can be achieved by hanging with a suspension rod 30 or any other suitable means. For example, on the upper plate ( Figures 1 - 4 the illustrated embodiment) or the fixing plate (Figures 6 - 10 Through holes 28 for connecting the suspension rods are provided at the front and rear ends of the shown embodiment, and the shape and size of the through holes are adapted to the suspension rods, which can be referred to as suspension rod holes. During installation, the lower hook 35 of the suspension rod is passed through the upper end of the corresponding suspension rod hole from the upper end of the suspension rod hole, and both ends of the upper plate (or fixing plate) are respectively hung on the lower end / hook of the suspension rod. The upper hook 33 of the suspension rod faces outward and is hung on the corresponding top edge of the reactor shell or on the relevant connecting parts / connection structures fixed to the shell (for example, horizontal rods or hooks). A positioning / limiting structure (for example, a concave structure) for hanging the upper hook of the suspension rod can be provided on the top edge of the shell or on the relevant connecting parts.

[0067] The cross-section of the suspension rod can be a flat rectangle. For example, it is prepared from a strip plate material. In this case, the suspension rod hole can adopt a corresponding strip hole.

[0068] Wiring terminals 13 can be provided at appropriate positions on the top of the electrode plate according to actual needs. For example, the wiring terminals of the electrode plate can be provided in the middle or on one side of the upper end of the electrode plate. During use, the power connection wires are connected through the wiring terminals. For Figures 1 to 4 For the shown embodiment, through holes serving as wire passing holes 16 can be provided on the upper plate for passing through the wiring terminals or connection wires. The wire passing holes can be provided as strip holes to adapt to different positions of the electrode plate.

[0069] According to the prior art, insulating materials such as insulating upper plates, lower plates, fixing plates, bolts, nuts, etc. can be prepared, such as insulating polymer materials (for example, PE).

[0070] This adjustable electrode assembly can be arranged in a water treatment device and used as an electrode required for electrocoagulation or an electrode required for other treatment processes. During use, the distance between the two electrode plates is set or adjusted according to actual needs to adapt to the actual requirements.

[0071] Figure 14 In the shown embodiment, two (or more) mutually parallel electrode plates are arranged on the guide rail 39 and are in sliding fit with the guide rail, thereby allowing the electrode plates to move relative to the guide rail. The guide rail is fixedly installed in the reactor, and the number of electrode plates and the distance between the electrode plates are set according to actual needs to meet the actual requirements. The guide rail can be divided into upper and lower groups, respectively supporting, guiding, and limiting the electrode plates from the top and bottom of the electrode plates. Any suitable prior art can be adopted to achieve the sliding fit between the guide rail and the electrode plate, allowing the electrode plates to slide parallel on the guide rail, thereby changing the spatial position distribution of the electrode plates and the distance between the electrode plates. The guide rail can be prepared from an electrically insulating material, and any suitable form of sliding guide rail (sliding guide rail assembly) can be adopted. A locking mechanism (for example, a thread / bolt fastening device) can be provided between the electrode plate and the guide rail. During use, the position of the electrode plate on the guide rail can be set and adjusted, and then the distance between the electrode plates can be adjusted.

[0072] According to actual needs, the two electrode plates are connected by a fixed connection method, thus forming an electrode assembly with an adjustable or fixed spacing. The structure of the electrode plate or the main part of the electrode plate can be the same as that of the electrode plate in the electrode assembly with an adjustable spacing.

[0073] Figure 1 In the illustrated embodiment, the two electrode plates 10 are not parallel to each other, but are inclined such that the upper spacing between the two electrode plates is small and the lower spacing is large, and the spacing at each part at the same height is the same, forming a wedge-shaped space between the two electrode plates. This can be referred to as a wedge-shaped arrangement, which is convenient for descaling the surface of the electrode plates. In this case and any other suitable cases, a number of columnar (or other suitable shapes) discharge protrusions 11 can be provided on the inner side surface of the electrode plate (the surface opposite to the other electrode plate that is centered with the electrode plate). The end is provided with a mushroom head shape, which can be referred to as the mushroom head 11, or it can also be a mushroom head that fits on the surface of the electrode body. During use, discharge mainly occurs through the discharge protrusions. Due to the arrangement of the discharge protrusions, the voltage requirement for discharge is effectively reduced. According to actual needs, the discharge protrusion density (or rather, the spacing between adjacent discharge protrusions) in different vertical regions can be the same. When necessary, the discharge protrusion density in different vertical regions can also be the same. Specifically, it can be set according to actual needs. For example, in some usage scenarios, there is a certain gradient distribution of impurities in water in the vertical direction. In the case where the discharge protrusion density in different vertical regions is consistent, through the inclined arrangement of the electrode plates, the discharge intensity at each part (region) in the vertical direction can be made approximately the same. And the mushroom head structure at the discharge end helps to reduce the voltage requirement for discharge and the discharge current / discharge intensity, while reducing the equipment requirements and equipment costs and ensuring the discharge effect. At the same time, due to the effect of concentrated discharge, the mushroom head is relatively not prone to fouling, which helps to reduce energy consumption and extend the service life.

[0074] The discharge protrusions can be installed on the electrodes by a detachable connection method (for example, threaded connection). For example, an external thread is provided at the connection end (connection region) of the discharge protrusion, and a screw hole is provided at an appropriate position on the electrode plate. The discharge protrusion is screwed onto the corresponding screw hole (which can be a through hole or a blind hole). When replacement is needed, the old discharge protrusion can be removed and a new one can be installed.

[0075] Figure 15 A suspension plate (a component for hoisting, handlifting, etc.) 47 for being arranged on the top of the electrode plate is shown. A suspension hole 49 is provided at the upper part of the suspension plate for hanging, handlifting, etc. This suspension plate can be fixed to the top of the electrode plate in any suitable manner (for example, Figure 14 in the illustrated embodiment, or used as Figures 6 - 9The middle partition of the illustrated embodiment has a specific shape and size according to actual installation and usage requirements. When the suspension plate is arranged between the two electrode plates, through holes 48 for passing bolts can be provided on the suspension plate, and the suspension plate and the electrode plates are fixed together by fastening bolts passing through the through holes (including the corresponding through holes on the electrode plates).

[0076] Figure 12 and Figure 13 In the illustrated embodiment, the water treatment device is provided with a pretreatment tank 110, an anoxic tank 120, an aerobic tank 130, a sedimentation tank 140, and a clear water tank 150 which are connected in sequence. Each tank can be separated by a partition in the same housing, or several independent tank bodies can be provided and connected through pipelines / channels.

[0077] The water inlet 103 of the water treatment device is arranged on the upper side wall of the pretreatment tank and is introduced from the upper part of the pretreatment tank; the water outlet 105 is arranged on the upper part of the clear water tank; the air inlet 104 is used to connect an air supply pipeline, and is usually the inlet of the main air supply pipeline. The main air supply pipeline is arranged at the bottom of the water treatment device and is used to supply air to the aeration devices in the relevant tanks, and its inlet is located outside the water treatment device for facilitating the connection of the external air supply pipeline; the first electrode assembly 106 and the second electrode assembly 107 can adopt any electrode assembly disclosed in the present invention and are respectively arranged in the pretreatment tank and the aerobic tank. Packings (or biological packings) 108 can be arranged in the aerobic tank and the anoxic tank, and preferably suspended packings evenly distributed in the water body in the tank (the distribution state is similar to the suspended state). The structures of the respective tanks can be set according to actual needs. For example, an overflow weir 143 can be arranged on the upper part of the sedimentation tank to implement overflow water discharge; the lower part of the sedimentation tank can be set as a sludge hopper 146. The sludge hopper is in the shape of a cone with a large upper part and a small lower part, and the sludge outlet is located at the bottom of the sludge hopper to facilitate sludge sedimentation and sludge discharge.

[0078] According to actual needs, additions, deletions, or other modifications can be made on the basis of the above embodiments. For example, a catch basin can be arranged in front of the water treatment device, the biochemical section (the anoxic tank and the aerobic tank) can be replaced with a multi-stage biochemical treatment facility composed of a first anoxic tank, an anaerobic tank, a first aerobic tank, a second anoxic tank, and a second aerobic tank arranged in sequence, an electrolytic electrode reactor can be arranged between the biochemical section and the sedimentation tank as a water quality improvement and optimization tank, a sand filter tank can be arranged between the sedimentation tank and the clear water tank, a disinfection facility can be added in the clear water tank or a disinfection tank can be arranged after the clear water tank, a sludge reflux system can be set according to actual needs, and facilities such as an equipment room can be equipped according to actual needs to obtain the required treatment / purification effect while taking into account the treatment cost.

[0079] Among them, Sump well: Introduce sewage into the sump well and use a grille to intercept debris (fixed grille, mechanical grille, or microfilter can be used) to prevent excessive debris from entering the station (water treatment device) and affecting the operation of mechanical equipment. The aperture of the grille can be 0.5 - 2 cm; the upper manhole cover is divided into two parts, one for observing and maintaining the water pump, and the other for intercepting debris and cleaning the debris hole; one water pump is in use and the other is in standby.

[0080] Regulating tank: Used to regulate the water volume and settle suspended solids in the water. The bottom adopts a 45-degree inclined funnel to facilitate the deposition of suspended solids and subsequent cleaning; one water pump is in use and the other is in standby, and a flow control valve is added to adjust the water volume entering the biochemical section according to the stable operation of the station; a waterproof split flowmeter is installed before entering the biochemical section (to prevent water vapor from entering the flowmeter and burning it out).

[0081] A plate-type electrolytic reactor can be installed in the regulating tank (for example, an electrode assembly with discharge protrusions). When difficult-to-degrade sewage enters the station, it is electrolytically degraded in the regulating tank. Hydroxyl is generated by electrolyzing water, and the strong oxidizing property is used to degrade organic matter, turning difficult-to-degrade organic matter into easily degradable matter. Iron ions are electrolytically precipitated and react with phosphate in the water to form precipitates, which are removed together with the bottom sediment during cleaning. The iron element precipitated by the electrolytic reactor (electrode assembly) promotes the growth of denitrifying bacteria. The amount of iron precipitation can be appropriately controlled and should not be excessive. Excessive iron precipitation inhibits the growth of the biological flora in the station. Under normal circumstances, the amount of iron element precipitation during electrolysis is controlled within a certain range of 0 - 10 mg / l. The electrode assembly in the regulating tank is used to adjust the water quality of the sewage to prevent too high a concentration from impacting the biochemical tank. When the station operates in winter, the biological flora in the biochemical tank has low efficiency due to low temperature. The electrode assembly can be used to warm the water body and pretreat the sewage concentration in advance, and the difficult-to-degrade pollutants are treated in advance. In addition, the electrolytic reactor can release heat during operation to warm the water body, which can effectively improve the treatment efficiency and effect of the subsequent biochemical section.

[0082] First anoxic tank (or anoxic section 1 of the biochemical tank): The effluent from the regulating tank enters the first anoxic tank. Aeration devices and suspended fillers can be set in the tank. Under normal conditions, the perforated aeration device is in the closed state. A push-flow agitator is installed inside the tank body to mix the mud and water evenly. The iron element precipitated by the electrode assembly in the regulating tank provides favorable conditions for anoxic biochemistry in the anoxic tank, supports the growth of the corresponding microbial population, and forms an enhanced version of the anoxic biochemical tank.

[0083] Anaerobic tank (or anaerobic section 1 of the biochemical tank): The effluent from the regulating tank consumes oxygen in the first anoxic tank and enters the anaerobic section with a greatly reduced oxygen content, which is beneficial to the growth of anaerobic denitrifying bacteria. The electrolytic iron element in the regulating tank flows into the anaerobic section with the influent water body, meeting the growth requirements of the corresponding microbial population, enabling the growth of the denitrifying bacterial population to be better than that of a conventional anaerobic tank, with higher nitrogen removal efficiency and stronger total nitrogen removal ability, forming an enhanced version of the anaerobic tank.

[0084] The first aerobic tank (or the aerobic tank 1 in the biochemical section): The regulation tank degrades and removes refractory organic matter, providing favorable and necessary conditions for the aerobic section to absorb and digest nutrients. The refractory organic matter is electrolytically oxidized into easily degradable substances, facilitating the absorption by the aerobic tank flora. Aeration devices and suspended fillers can be installed in the tank. Aeration devices and suspended fillers can be installed in the tank.

[0085] The second anoxic tank (or the anoxic tank 2 in the biochemical section): It is a circulating biochemical tank to enhance the denitrification ability and form polyphosphate-accumulating organisms. The first anoxic tank can adopt the same or similar structure as the first anoxic tank.

[0086] The second aerobic tank (or the aerobic tank 2 in the biochemical section): It is used to enhance the absorption and digestion of pollutants in the water in the aerobic section and can adopt the same or similar structure as the first aerobic tank.

[0087] The water quality improvement and optimization tank (electrolytic electrode reactor, abbreviated as the optimization tank): When the water quality treatment in the biochemical section is not good, the electrolytic electrode reactor (for example, an electrode assembly with adjustable spacing) is turned on to assist in removing organic matter, total phosphorus, and suspended solids.

[0088] The sedimentation tank (or the secondary sedimentation tank): A lamella sedimentation device or other suitable facilities can be adopted. Since the electrolytic reactor in the regulation tank and the optimization tank release iron ions and electrons to adsorb and coagulate activated sludge, the sedimentation in the sedimentation tank is accelerated. A buffer can be installed to reduce the water flow impact, assist in sedimentation, and reduce or prevent the disturbance of the water flow to the activated sludge.

[0089] The filter (or the sand filter tank): It further reduces the suspended solids and improves the effluent quality.

[0090] The clear water tank: The effluent is discharged externally.

[0091] The equipment room: The underground equipment room is raised. An emergency pump is installed at the bottom for drainage. When the water level rises, the equipment such as the fans in the station will not be flooded. It is not necessary to pre-reserve an equipment emergency pump pit in the civil engineering, reducing the construction difficulty.

[0092] The aeration device can adopt a perforated pipe, which is laid at the bottom of the tank and connected to the air supply pipe. Air (for example, air) enters the tank through the through holes on the pipe wall of the perforated pipe, and the oxygen in it dissolves into the water to form dissolved oxygen.

[0093] An air supply control valve can be set for air supply control.

[0094] An air supply main pipe can be set, extending to the bottom of each tank equipped with an aeration device. The aeration devices of each tank are connected through the air supply branch pipes (connecting pipes) of each tank. The air supply control valve can be set on the air supply branch pipe to control the aeration of each tank respectively.

[0095] The floating packing can adopt flexible packing with a three-dimensional distribution, or several packing monomers (for example, spherical / block-shaped biological packing) can be connected to a three-dimensional (3D) packing rack in the pool, so that the packing monomers are roughly evenly distributed in the water body in the pool, with a spacing left between the packing monomers. Compared with the packing stacking method, this packing setting method is more conducive to achieving the even distribution of the packing in the pool, realizing the stripping of dead sludge on the packing and sludge renewal, maintaining sludge activity, improving the purification degree, and reducing the fluid resistance in the pool.

[0096] The packing rack adopts any form that can evenly distribute the packing monomers connected to the packing rack (the distribution method in any of the three directions of up and down, left and right, and front and back is uniform / roughly uniform distribution) in the corresponding water space, and the packing monomers are connected to the packing rack according to the evenly distributed method. For example, a three-dimensional wire rack can be used as the packing rack. For example, a number of plane grids (grid structures) are arranged at intervals up and down on a rigid three-dimensional frame, and the plane grids are connected into one body through a rigid skeleton. Packing monomers are installed at the grid intersection points of each plane grid, and there is a gap between each packing monomer. Thus, the fixing and supporting of each packing monomer are realized through the packing rack. In this implementation mode, the plane grid can adopt a rigid grid or a moderately tightened flexible grid, thereby allowing the plane grid and the packing monomers installed on the plane grid to have a certain degree of movement under the action of water flow, which is conducive to more fully mixing with water and facilitating sludge renewal.

[0097] The sedimentation tank (and sand filter tank) can adopt overflow water discharge to facilitate ensuring the purification degree of the effluent. The overflow weir can be arranged at the upper part of the tank, and an effluent trough is arranged outside the overflow weir, and it flows into the subsequent clear water tank (or sand filter tank) through the water outlet connecting to the subsequent clear water tank (or sand filter tank).

[0098] The bottom of the sedimentation tank can adopt a conical hopper-shaped structure with a larger upper part and a smaller lower part, and a sludge outlet (sludge discharge pipe) is arranged at the bottom, and a sludge discharge valve is arranged on the sludge outlet (sludge discharge pipe) to facilitate the sedimentation of sludge at the bottom of the tank and sludge discharge control.

[0099] The orientation descriptions such as up, down, left, right, front, back, vertical, and horizontal in this specification are only used to describe or limit the relative positions between the relevant parts / positions, and are not used to limit the actual orientation in use (unless otherwise clearly defined).

[0100] All the preferred and optional technical means disclosed in the present invention, except as otherwise specified and when one preferred or optional technical means is a further limitation of another technical means, can be arbitrarily combined to form several different specific implementation modes.

Claims

1. A water treatment device with a discharge convex electrode assembly is provided with a biochemical treatment unit and a pretreatment unit located in front of the biochemical treatment unit, wherein the pretreatment unit comprises a pretreatment tank, wherein the pretreatment tank is provided with an electrode assembly, characterized in that The electrode assembly is provided with two electrode plates arranged opposite to each other. Discharge convexities are provided on the discharge side surfaces of the electrode plates. A gap is left between the discharge convexity on any electrode plate and the other electrode plate.

2. The water treatment device according to claim 1, characterized in that The biochemical treatment unit comprises an aerobic tank, and the electrode assembly may be provided in the aerobic tank.

3. The water treatment device according to claim 1 or 2, characterized in that The number of discharge protrusions on the same electrode plate is multiple.

4. The water treatment device according to claim 1 or 2, characterized in that The discharge side of the discharge convex adopts a mushroom head structure.

5. The water treatment device according to claim 4, characterized in that The discharge protrusion is provided with a connecting column, the outer end of the connecting column is connected to the mushroom head structure, and the inner end is connected to the electrode plate.

6. The water treatment device according to claim 1 or 2, characterized in that The main parts of the two electrode plates are in the shape of flat plates and are arranged parallel to each other or in a wedge shape.

7. The water treatment device according to claim 1 or 2, characterized in that The connection between the two electrode plates is a fixed connection or a connection with adjustable spacing.

8. The water treatment device according to claim 1 or 2, characterized in that The two electrode plates are connected in any of the following ways: An upper plate and a lower plate are provided for fixing and installing the electrode plate, the electrode plate is located between the upper plate and the lower plate, and the top and bottom of the electrode plate are respectively fastened to the upper plate and the lower plate by fastening bolts, and the upper plate and the lower plate are both provided with distance-adjusting mounting holes for passing corresponding fastening bolts, and the distance-adjusting mounting holes are strip-shaped holes whose length direction is perpendicular to the electrode plate; The two electrode plates are fixedly connected together by a plurality of adjustable distance fixing bolts, and the two electrode plates are provided with a plurality of corresponding through holes for fixed connection, and the two ends of the adjustable distance fixing bolts respectively pass through the corresponding through holes on the two electrode plates, and are both provided with a clamping nut assembly for clamping the corresponding electrode plates, and the clamping nut assembly comprises an inner clamping nut located on the inner side of the corresponding electrode plate and an outer clamping nut located on the outer side of the corresponding electrode plate, and the electrode plates on the corresponding sides are clamped by the corresponding inner clamping nut and the outer clamping nut; A backing plate is arranged between the two electrode plates. The electrode plates and the backing plate are provided with a plurality of through holes corresponding to each other and are fastened together by clamping bolts passing through the corresponding through holes.

9. A water treatment method, characterized in that The water treatment device described in claims 1-8 is used to remove pollutants from water, the biochemical treatment unit includes an aerobic tank, the electrode assembly is provided in the aerobic tank, the electrode assembly is provided in the aerobic tank, iron ions are released through the electrode assembly, and an iron ion environment that is conducive to the growth and metabolism of aerobic microorganisms is formed, thereby improving the aerobic biochemical reaction capacity of the aerobic tank and / or enhancing the aerobic biochemical reaction intensity of the aerobic tank, and the electrode assembly in the aerobic tank is a fixed electrode assembly or an electrode assembly with adjustable electrode spacing.

10. The water treatment device according to claim 9, characterized in that The connection between the two electrode plates in the electrode assembly is a spacing-adjustable connection, and the spacing between the electrode plates in the electrode assembly is set or adjusted according to the water flow rate or pollutant flow rate of the incoming water.

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