Wastewater treatment process

Abstract

The present application discloses a wastewater treatment process, comprising the following steps: collection and homogenization, homogenizing the water quality and quantity of the wastewater; anaerobic treatment, wherein the homogenized wastewater enters an anaerobic tank, where large-molecule organic matter is decomposed into small-molecule organic matter; aerobic treatment, wherein the anaerobic-treated wastewater enters an aerobic tank to remove organic pollutants in the wastewater; MBR membrane filtration, wherein the aerobic-treated mixed liquid enters the MBR tank for mud-water separation; and ozone catalysis, wherein the wastewater is pumped through the MBR into the ozone catalytic oxidation unit, where the refractory organic matter in the wastewater is fully decomposed after catalytic oxidation treatment. The present application uses the OA-MBR-ozone catalytic oxidation combined wastewater treatment process to replace the carbon sand filtration process, which can reduce the outsourcing of waste activated carbon, does not generate secondary pollution, is environmentally friendly, has low operating costs, and has a high pollutant removal rate.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a wastewater treatment process. Background Art

[0002] The cleaning wastewater generated during the machining process usually contains suspended matter, surface-active organic pollutants, etc. For this type of wastewater, the flotation-coagulation sedimentation-sand carbon filtration treatment process is currently commonly used. After the wastewater passes through the sand carbon, most of the pollutants are retained on the surface of the sand carbon, and fine dirt and other organic matter are retained inside the sand carbon layer.

[0003] After a period of filtration, the sand carbon needs to be flushed or even replaced frequently. The use of large amounts of activated carbon can easily cause secondary pollution. Summary of the Invention

[0004] In order to solve the problem that sand carbon filtration easily causes secondary pollution of a large amount of waste activated carbon, the present application provides a wastewater treatment process.

[0005] The present application provides a wastewater treatment process, which adopts the following technical solution: A wastewater treatment process, comprising the following steps:

[0006] Collect and homogenize the wastewater to homogenize the water quality and quantity;

[0007] Anaerobic treatment: the homogenized wastewater enters the anaerobic tank, where the macromolecular organic matter is decomposed into small molecular organic matter;

[0008] Aerobic treatment: the wastewater after anaerobic treatment enters the aerobic tank to remove organic pollutants in the wastewater;

[0009] MBR membrane filtration, the mixed liquid after aerobic treatment enters the MBR pool for mud and water separation;

[0010] Ozone catalysis: wastewater is pumped into the ozone catalytic oxidation unit through the MBR, and the difficult-to-degrade organic matter in the wastewater is decomposed after catalytic oxidation treatment.

[0011] By adopting the above technical solution, wastewater is treated through anaerobic, aerobic, MBR and ozone catalytic oxidation, replacing the carbon sand filtration process, which can reduce the outsourcing amount of waste activated carbon, avoid secondary pollution, be environmentally friendly, have low operating costs and high pollutant removal rate.

[0012] In a specific embodiment, a mud-water separation tank is provided between the anaerobic tank and the aerobic tank, a reflow tank is provided between the mud-water separation tank and the anaerobic tank, and between the MBR tank and the aerobic tank, and a reflow component for filtering sludge is provided in the reflow tank.

[0013] By adopting the above technical solution, a reflow tank is set up, and the mixed liquid after anaerobic reaction enters the mud-water separation tank, and the mud and water are separated by natural sedimentation. The settled sludge enters the reflow tank and then returns to the anaerobic tank through the reflow component. Similarly, the sludge in the MBR tank enters the aerobic tank through the reflow component in the reflow tank, thereby improving the utilization rate of the sludge.

[0014] In a specific feasible implementation scheme, the reflux component includes a filter plate, a supporting plate and an anti-blocking plate, the filter plate is provided with a plurality of filter holes, the supporting plate is provided with a plurality of supporting holes, the filter holes are connected with the supporting holes, a driving component for driving the anti-blocking plate to rise and fall is provided in the reflux pool, a plurality of anti-blocking strips are provided on the anti-blocking plate, the anti-blocking strips are used to pass through the filter holes and the supporting holes, a reflux cavity is formed between the supporting plate and the filter plate, a reflux pipe is provided on the reflux pool, one end of the reflux pipe is connected with the reflux cavity, and the other end is connected with the anaerobic pool or the aerobic pool.

[0015] By adopting the above technical solution, the filter plate can filter stones and other substances in the sludge. The filtered sludge reaches the supporting plate and eventually enters the anaerobic tank or aerobic tank. The anti-blocking plate is driven up and down by the driving component, and the anti-blocking strip can clean the filter holes to avoid clogging of the filter holes as much as possible.

[0016] In a specific possible implementation scheme, a sink hole communicating with the bearing hole is provided on the bearing plate, a bearing piece is rotatably connected in the sink hole, and the bearing piece is used to close the bearing hole.

[0017] By adopting the above technical solution, the carrying hole is closed by the carrying sheet, so that the sludge can be intercepted between the carrying sheet and the filter sheet, so that the filtered sludge flows out of the return pipe and flows into the anaerobic tank or the aerobic tank, thereby realizing the reuse of the sludge.

[0018] In a specific feasible implementation scheme, the driving assembly includes a lifting ratchet bar and a lifting block, a pawl is rotatably connected in the lifting block, a reset rod is installed on the inner wall of the lifting block, a reset spring is sleeved on the reset rod, and a connecting rod is rotatably connected to the pawl, a connecting hole is opened in the connecting rod, and the reset rod is slidably installed in the connecting hole, one end of the reset spring contacts with the inner wall of the lifting block, and the other end contacts with the connecting rod, a lifting frame is installed on the lifting block, and the lifting frame is connected to the anti-blocking plate.

[0019] By adopting the above technical solution, the anti-blocking plate is installed on the lifting frame, and the lifting block is driven to rise. The pawl can be engaged with the lifting ratchet bar to limit the lifting block and prevent it from falling. The anti-blocking plate is pushed to the top, so that the anti-blocking bar passes through the filter hole to clean the sludge accumulated in the filter hole, and the operation is convenient.

[0020] In a specific feasible implementation scheme, the lifting frame is U-shaped and includes a cross bar and a horizontal bar. The horizontal bar is arranged at both ends of the cross bar. A limiting groove is provided on the lifting frame, and a limiting block is provided on the anti-blocking plate. The limiting block is slidably installed in the limiting groove.

[0021] By adopting the above technical solution and setting the limit groove, it is convenient to install the anti-blocking plate on the lifting frame, and it can limit the vertical movement between the anti-blocking plate and the lifting frame, thereby limiting the position of the anti-blocking plate and facilitating the installation and disassembly of the anti-blocking plate.

[0022] In a specific possible implementation scheme, a heating plate is provided at the bottom of the anti-blocking plate, a rotating assembly is installed on the lifting block, and the lifting frame is installed on the rotating assembly.

[0023] By adopting the above technical solution, the lifting frame is rotated by the rotating component so that the heating plate is located at the top, and then the lifting frame is moved upward so that the heating plate contacts the supporting plate. The heating plate can transfer heat to the supporting plate to dry the waste sludge on the supporting plate, making it easier to clean the waste sludge.

[0024] In a specific feasible implementation scheme, the heating plate is detachably connected to the lifting frame, a connecting block is provided on the heating plate, and an installation groove for the connecting block to be inserted is provided on the inner wall of the lifting frame, and the installation groove includes a first connecting part and a second connecting part, the first connecting part and the second connecting part are connected, the first connecting part is vertically arranged, and the second connecting part is arranged on the side of the first connecting part close to the cross bar and is horizontally arranged, a card block is provided on the heating plate, and a card slot for the card block to be inserted is provided on the cross bar.

[0025] By adopting the above technical solution, the heating plate is first pushed upward so that the connecting block on the heating plate enters the first connecting part, and then the heating plate is pushed horizontally so that the connecting block on the heating plate enters the second connecting part. At the same time, the card block is inserted into the card slot to achieve the positioning of the heating plate, which helps to achieve a better connection effect.

[0026] In a specific possible implementation scheme, the rotating assembly includes a rotating disk, a rotating gear and a knob. The rotating disk is rotatably connected to the lifting block, the rotating gear is coaxially mounted on the rotating disk, and the knob is transmission-connected to the rotating gear.

[0027] By adopting the above technical solution, the knob is rotated, the knob drives the rotating gear to rotate, and the rotating gear drives the rotating disk to rotate, thereby realizing the flipping of the lifting frame.

[0028] In a specific feasible implementation scheme, a plurality of baffles are provided on the filter plate, and the baffles enclose a filter cavity on the filter plate. A plurality of filter strips are installed on the inner wall of the baffle, and the cross-section of the filter strips is inverted V-shaped. The filter strips are arranged at intervals along the length direction of the filter plate.

[0029] By adopting the above technical solution and setting filter strips, the sludge will first come into contact with the filter strips before reaching the filter plate. The filter strips will crush the large pieces of sludge, and the crushed sludge will then be filtered through the filter plate, which will help achieve better filtering effects.

[0030] In summary, this application includes at least one of the following beneficial technical effects:

[0031] 1. The AO-MBR-ozone catalytic oxidation combined treatment process has extremely high removal efficiency and a stable system, which can avoid the use of large amounts of activated carbon and minimize secondary pollution;

[0032] 2. The AO-MBR-ozone catalytic oxidation combined treatment process can avoid the use of hydrogen peroxide, has relatively unlimited applications, and has low operating costs;

[0033] 3. The reflux component can filter the settled sludge, replenish the sludge in the anaerobic tank and aerobic tank, and also discharge the aged sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a system flow chart of an embodiment of the present application.

[0035] Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0036] Figure 3 It is a cross-sectional view of the internal structure of the reflow pool in an embodiment of the present application.

[0037] Figure 4 It is a structural diagram of the load-bearing plate and the anti-blocking plate in the embodiment of the present application.

[0038] Figure 5 It is a structural diagram of the drive component in an embodiment of the present application.

[0039] Figure 6 It is a structural diagram of the reflux component in an embodiment of the present application.

[0040] Figure 7 It is a schematic diagram of the explosion structure of the lifting frame, heating plate and anti-blocking plate in the embodiment of the present application.

[0041] Description of reference numerals:

[0042] 1. Collection tank; 2. Anaerobic tank; 3. Mud-water separation tank; 4. Aerobic tank; 50. MBR tank; 5. Return tank; 51. Installation port; 52. Installation door; 6. Return assembly; 61. Filter plate; 62. Loading plate; 63. Anti-blocking plate; 64. Filter hole; 65. Baffle; 66. Filter chamber; 67. Filter strip; 69. Return chamber; 71. Loading hole; 72. Sink hole; 73. Loading sheet; 8. Drive assembly; 81. Lifting ratchet bar; 82. Lifting block; 83. Ratchet; 84. Reset lever; 85. Connector Connecting rod; 86, connecting hole; 87, reset spring; 88, reset groove; 89, reset rod; 90, slide groove; 9, rotating assembly; 91, rotating disk; 92, rotating gear; 93, knob; 94, transmission gear; 95, lifting frame; 951, cross bar; 952, horizontal bar; 97, limit groove; 98, limit block; 99, anti-blocking strip; 10, heating plate; 11, clamping block; 12, mounting groove; 121, first connecting part; 122, second connecting part; 13, clamping groove; 14, connecting block; 15, descending rod. DETAILED DESCRIPTION

[0043] The present application is further described in detail below with reference to the accompanying drawings.

[0044] The present application discloses a wastewater treatment process, referring to Figure 1 , the wastewater treatment process includes the following steps:

[0045] Collection and homogenization: In order to avoid the impact of wastewater, the wastewater generated during the machining process is firstly allowed to enter the collection tank 1, and the collection tank 1 pre-homogenizes the water quality and quantity of the wastewater;

[0046] Anaerobic treatment: The homogenized wastewater enters anaerobic tank 2. Under the adsorption and degradation action of anaerobic microorganisms, the macromolecular organic matter in the wastewater is decomposed into small molecular organic matter, improving the biodegradability of the water quality. The removal share rate of anaerobic tank 2 is 40%, the HRT is 30h, and the CODcr load is 0.8kgCODcr / m3 / day.

[0047] Mud and water separation: the mixed liquid after anaerobic reaction enters the mud and water separation tank 3, and is separated by natural sedimentation. The settled sludge is returned to the anaerobic tank 2 as a supplement, and the aged sludge is discharged regularly.

[0048] Aerobic treatment: The wastewater after anaerobic treatment enters the aerobic tank 4. Under the action of aerobic activated sludge coagulation, adsorption, oxidation, and decomposition, the organic pollutants in the wastewater are removed and the CODcr is reduced. The removal rate of the aerobic tank is 95%, the HRT is 30h, and the BODcr load is 0.1kgBOD5 / kgMLSS / day;

[0049] MBR membrane filtration: the mixed liquor after aerobic treatment enters the MBR tank 50 for precision filtration. The effluent is clear, with low suspended solids content, and most of the organic matter is degraded. The sludge is returned to the aerobic tank 4 to replenish the sludge, and the aged sludge is discharged regularly;

[0050] Ozone catalysis: Wastewater is pumped through the MBR into the ozone catalytic oxidation unit. The wastewater enters the catalytic oxidation reaction tower, dissolving and evenly dispersing the gas-liquid mixture. The mixture is evenly dispersed throughout the bottom of the reaction tower. Organic matter in the wastewater is adsorbed by the catalyst and concentrated on the surface. Ozone, under the action of the catalyst, decomposes into ·OH. The strong oxidizing power of ·OH causes most of the difficult-to-degrade organic matter to undergo chain scission, ring opening, and oxidation reactions, ultimately oxidizing them into small organic molecules, CO2, and H2O. The designed influent CODcr is 200mg / L, with a designed shared removal rate of 50%. The HRT of the CO ozone reaction tower is 2h, and the ozone inlet concentration is 200mg / L.

[0051] Compared to sand carbon filtration, the AO (anaerobic aerobic process)-MBR-ozonation catalytic oxidation combined treatment system offers a high removal rate and effectively removes recalcitrant organic pollutants from machining wastewater. The effluent maintains consistently superior effluent quality, as low as 80 mg / L CODcr, with an overall removal rate of 92-97%. This system also avoids the use of large amounts of activated carbon, further minimizing secondary pollution and fostering environmental friendliness. Compared to the Fenton process, the AO-MBR-ozonation catalytic oxidation combined treatment system requires virtually no chemical additions, eliminating the use of hydrogen peroxide. Its application is relatively unrestricted, and its overall operating costs are low.

[0052] Reference Figure 2 and Figure 3 During the sludge return process, garbage or lumps mixed in the sludge can easily cause blockages and make it difficult to clean the garbage and lumps in the sludge. To this end, a return tank 5 is set between the mud-water separation tank 3 and the anaerobic tank 2, and between the MBR tank 50 and the aerobic tank 4. A return component 6 for filtering the sludge is set in the return tank 5.

[0053] Reference Figure 2 and Figure 3The reflux assembly 6 includes a filter plate 61 fixed to the inner wall of the reflux tank 5. The filter plate 61 is provided with a plurality of filter holes 64. Four baffles 65 are fixed to the filter plate 61, forming a filter cavity 66 on the filter plate 61. A filter strip 67 is fixed to the top of the baffle 65. The filter strip 67 has an inverted V-shaped cross section. A plurality of filter strips 67 are provided, and the filter strips 67 are spaced apart along the length of the filter plate 61. After the sludge enters the reflux tank 5, it first comes into contact with the filter strips 67. Due to the inverted V-shaped cross section, the filter strips 67 collide with and break up any lumps of sludge. The broken-down sludge chunks then fall onto the filter plate 61, which then filters the sludge chunks, separating the garbage from the sludge, and allowing the sludge to flow out through the filter holes 64.

[0054] Reference Figure 2 and Figure 3 A supporting plate 62 is provided at the bottom of the filter plate 61, and a reflux chamber 69 is formed between the supporting plate 62 and the filter plate 61. A reflux pipe (not shown) is fixed to the reflux tank 5, one end of which is connected to the anaerobic tank 2, and the other end is connected to the reflux chamber 69. The filtered sludge reaches the supporting plate 62 and then flows into the anaerobic tank 2 through the reflux pipe for replenishment.

[0055] Reference Figure 3 and Figure 4 The bearing plate 62 is provided with a plurality of bearing holes 71, which are connected to the filter holes 64. The top wall of the bearing plate 62 is provided with a sink hole 72, which is coaxial with the bearing hole 71. A bearing piece 73 is hinged in the sink hole 72, and the bearing piece 73 is used to close the bearing hole 71.

[0056] Reference Figure 4 and Figure 5A drive assembly 8 is installed in the reflux tank 5. The drive assembly 8 includes a lifting ratchet bar 81 and several lifting blocks 82. There are two lifting ratchet bars 81, which are vertically arranged on both sides of the length direction of the reflux tank 5. The lifting blocks 82 are slidably mounted on the lifting ratchet bar 81. A pawl 83 is hinged on the inner wall of the lifting block 82, and the pawl 83 can be snapped into the lifting ratchet bar 81. A reset rod 84 is hinged on the inner wall of the lifting block 82, and a connecting rod 85 is hinged on the pawl 83. A connecting hole 86 is provided in the connecting rod 85. The reset rod 84 is slidably mounted in the connecting rod 85. A reset spring 87 is sleeved on the reset rod 84. One end of the reset spring 87 contacts the reset rod 84, and the other end contacts the connecting rod 85. When the lifting block 82 moves upward, the lifting ratchet bar 81 pushes the bottom end of the pawl 83 away from the lifting ratchet bar 81, thereby driving the lifting block 82 to rise on the lifting ratchet bar 81. After the lifting block 82 is released, the pawl 83 is reset under the action of the reset spring 87, and the pawl 83 is engaged with the lifting ratchet bar 81 to limit the lifting block 82 and prevent the lifting block 82 from sliding up and down on the lifting ratchet bar 81.

[0057] Reference Figure 4 and Figure 5 A descending rod 15 is fixed to the bottom of the pawl 83. The descending rod 15 passes through the lifting block 82. The lifting block 82 is provided with a reset groove 88 for the descending rod 15 to slide. The lifting ratchet bar 81 is provided with a vertical slide groove 90, in which the descending rod 15 can slide. When the lifting block 82 needs to be lowered, the lifting block 82 is manually lifted, and the descending rod 15 is pushed inward, causing the bottom end of the pawl 83 to deflect toward the reset spring 87, thereby facilitating the lowering of the lifting block 82.

[0058] Reference Figure 4 and Figure 6 Each lifting block 82 is mounted with a rotating assembly 9, and the carrier plate 62 is also mounted on the rotating assembly 9, so that the carrier plate 62 can be lifted and lowered along the driving assembly 8 and flipped in the reflow tank 5. The rotating assembly 9 includes a rotating disk 91, a rotating gear 92, and a knob 93. The rotating disk 91 is rotatably connected to the lifting block 82, and the rotating gear 92 is coaxially fixed to the rotating disk 91. The lifting block 82 is also mounted with a transmission gear 94, which meshes with the rotating gear 92. The knob 93 is rotatably connected to the lifting block 82, and the knob 93 meshes with the transmission gear 94. Figure 7A lifting frame 95 is installed on the rotating disk 91. The lifting frame 95 includes a cross bar 951 and two horizontal bars 952. The horizontal bars 952 are fixed at both ends of the cross bar 951, and the lifting frame 95 is U-shaped. An anti-blocking plate 63 is installed on the lifting frame 95. A limiting groove 97 is provided on the top wall of the horizontal bar 952 along the length direction of the horizontal bar 952. A limiting block 98 is fixed on the bottom wall of the anti-blocking plate 63. The limiting block 98 is slidably installed in the limiting groove 97. The limiting block 98 is specifically a dovetail block, and the limiting groove 97 is specifically a dovetail groove. The cooperation between the dovetail groove and the dovetail block can limit the relative movement of the anti-blocking plate 63 and the lifting frame 95 in the vertical direction. Figure 3 A mounting opening 51 is provided on the side wall at the bottom of the reflow tank 5. A mounting door 52 is hingedly connected to the reflow tank 5 at the mounting opening 51. By opening and closing the mounting door 52, the anti-blocking plate 63 can be easily installed and removed. A plurality of anti-blocking strips 99 are fixed to the top wall of the anti-blocking plate 63. The anti-blocking strips 99 can pass through the filter hole 64 and the bearing hole 71. When the filter hole 64 is blocked, the lifting block 82 is moved upward, and the lifting block 82 drives the anti-blocking plate 63 to rise. The anti-blocking strips 99 on the anti-blocking plate 63 pass through the bearing hole 71, push the bearing piece 73 upward, and then pass through the filter hole 64 to clean the sludge in the filter hole 64, thereby minimizing the blockage of the filter plate 61.

[0059] When the aged sludge needs to be discharged, additional equipment is required to dry the aged sludge and reduce the moisture content of the sludge. The dried sludge can be used as fuel for secondary use.

[0060] Reference Figure 7 To this end, a heating plate 10 is installed on the lifting frame 95 at the bottom of the anti-blocking plate 63, which can achieve sludge reflow and drying of aged sludge in a reflow tank 5, helping to improve work efficiency, increase equipment utilization and reduce the space occupied by the equipment. A connecting block 14 is fixed to the side wall of the heating plate 10, and a mounting groove 12 for the connecting block 14 to be inserted is provided on the inner side wall of the horizontal rod 952. A slot 13 is provided on the cross bar 951, and a block 11 is fixed on the side of the heating plate 10 facing the cross bar 951, and the block 11 can be inserted into the slot 13. The mounting groove 12 includes a first connecting portion 121 and a second connecting portion 122. The first connecting portion 121 and the second connecting portion 122 are connected, the first connecting portion 121 is arranged vertically, and the second connecting portion 122 is arranged horizontally. The second connecting portion 122 is arranged on the side of the first connecting portion 121 facing the slot 13. When installing the heating plate 10 , first push the heating plate 10 upward so that the block 11 is locked in the first connection portion 121 , and then push the heating plate 10 toward the slot 13 so that the block 11 is locked in the second connection portion 122 to complete the installation of the heating plate 10 .

[0061] By rotating the lifting frame 95 to position the heating plate 10 at the top, and then pushing the lifting frame 95 upward, the heating plate 10 contacts the carrying plate 62. The heating plate 10 transfers heat to the carrying plate 62, drying the sludge on the carrying plate 62. The carrying plate 62 is then moved to the installation opening 51, the installation door 52 is opened, the carrying plate 62 is removed from the reflow tank 5, and the sludge on the carrying plate 62 is cleaned. Alternatively, the carrying plate 62 can be rotated to tilt it and the sludge on the carrying plate 62 can be cleaned manually, which is convenient.

[0062] The implementation principle of the embodiment of the present application is as follows: the wastewater generated by machining first enters the collection tank 1, which homogenizes the wastewater, and then enters the anaerobic tank 2. The anaerobic microorganisms in the anaerobic tank 2 decompose the large molecular organic matter in the wastewater into small molecular organic matter, thereby improving the biochemical properties of the water. The mixed liquid after the anaerobic reaction enters the mud-water separation tank 3, and the mud-water separation is achieved under the action of natural sedimentation. The settled sludge enters the return tank 5, and the large pieces of sludge are broken by the impact with the filter strip 67. The large filter plate 61 filters the garbage in the sludge, and the filtered sludge enters the anaerobic tank 2 from the return pipe as a supplement. When the filter plate 61 is blocked, move the lifting frame 95 upwards to allow the anti-blocking strip 99 to pass through the filter hole 64 to clean the filter hole 64. When it is necessary to process some of the aged sludge, the lifting frame 95 is flipped over so that the heating plate 10 on the lifting frame 95 contacts the carrying plate 62, and the sludge on the carrying plate 62 is heated to dry the sludge. The carrying plate 62 is then taken out of the reflow tank 5 and the dried sludge is cleaned.

[0063] After anaerobic treatment, the wastewater enters aerobic tank 4, where aerobic activated sludge removes most of the organic pollutants. The wastewater then enters MBR tank 50 for sludge-water separation. The wastewater then enters recirculation tank 5, located between MBR tank 50 and aerobic tank 4, and then flows back to aerobic tank 4. An ozone catalytic process is installed at the rear end of MBR tank 50 to catalytically oxidize and decompose most of the difficult-to-degrade organic matter in the wastewater.

[0064] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A wastewater treatment process, characterized in that: The steps include: Collect and homogenize the wastewater to homogenize the water quality and quantity; Anaerobic treatment: the homogenized wastewater enters the anaerobic tank (2), where the macromolecular organic matter is decomposed into small molecular organic matter; Aerobic treatment: the wastewater after anaerobic treatment enters the aerobic tank (4) to remove organic pollutants in the wastewater; MBR membrane filtration, the mixed liquid after aerobic treatment enters the MBR pool (50) for mud and water separation; Ozone catalysis: wastewater is pumped into the ozone catalytic oxidation unit through the MBR. The refractory organic matter in the wastewater is decomposed after catalytic oxidation treatment; A mud-water separation tank (3) is provided between the anaerobic tank (2) and the aerobic tank (4); a return tank (5) is provided between the mud-water separation tank (3) and the anaerobic tank (2), and between the MBR tank (50) and the aerobic tank (4); a return assembly (6) for filtering sludge is provided in the return tank (5); the return assembly (6) comprises a filter plate (61), a bearing plate (62) and an anti-blocking plate (63); a plurality of filter holes (64) are provided on the filter plate (61); a plurality of bearing holes (71) are provided on the bearing plate (62); the filter holes (64) are communicated with the bearing holes (71); a filter assembly (61) for driving the anti-blocking plate (63) is provided in the return tank (5); A driving assembly (8) for lifting the plate (63) and / or the bearing plate (62); a plurality of anti-blocking strips (99) are provided on the anti-blocking plate (63); the anti-blocking strips (99) are used to pass through the filter hole (64) and the bearing hole (71); a reflux cavity (69) is formed between the bearing plate (62) and the filter plate (61); a reflux pipe (70) is provided on the reflux pool (5); one end of the reflux pipe (70) is connected to the reflux cavity (69), and the other end is connected to the anaerobic pool (2) or the aerobic pool (4); a mounting opening (51) is provided on the side wall of the bottom of the reflux pool (5); and a mounting door (52) is hingedly connected to the reflux pool (5) at the mounting opening (51); The driving assembly (8) comprises a lifting ratchet bar (81) and a lifting block (82); a heating plate (10) is provided at the bottom of the anti-blocking plate (63); a rotating assembly (9) is mounted on the lifting block (82); and a lifting frame (95) is mounted on the rotating assembly (9).

2. The wastewater treatment process according to claim 1, characterized in that: The bearing plate (62) is provided with a sink hole (72) connected to the bearing hole (71), and a bearing piece (73) is rotatably connected in the sink hole (72), and the bearing piece (73) is used to close the bearing hole (71).

3. The wastewater treatment process according to claim 1, characterized in that: A ratchet (83) is rotatably connected to the lifting block (82), a reset rod (84) is installed on the inner wall of the lifting block (82), a reset spring (87) is sleeved on the reset rod (84), a connecting rod (85) is rotatably connected to the ratchet (83), a connecting hole (86) is provided in the connecting rod (85), the reset rod (84) is slidably installed in the connecting hole (86), one end of the reset spring (87) contacts the inner wall of the lifting block (82), and the other end contacts the connecting rod (85), a lifting frame (95) is installed on the lifting block (82), and the lifting frame (95) is connected to the anti-blocking plate (63).

4. The wastewater treatment process according to claim 3, characterized in that: The lifting frame (95) is U-shaped and includes a cross bar (951) and a horizontal bar (952). The horizontal bar (952) is arranged at both ends of the cross bar (951). A limiting groove (97) is provided on the lifting frame (95). A limiting block (98) is provided on the anti-blocking plate (63). The limiting block (98) is slidably installed in the limiting groove (97).

5. The wastewater treatment process according to claim 4, characterized in that: The heating plate (10) is detachably connected to the lifting frame (95); a connecting block (14) is provided on the heating plate (10); an installation groove (12) for the connecting block (14) to be inserted is provided on the inner wall of the lifting frame (95); the installation groove (12) includes a first connecting portion (121) and a second connecting portion (122); the first connecting portion (121) and the second connecting portion (122) are connected; the first connecting portion (121) is vertically arranged; the second connecting portion (122) is arranged on a side of the first connecting portion (121) close to the cross bar (951) and is arranged horizontally; a card block (11) is provided on the heating plate (10); and a card groove (13) for the card block (11) to be inserted is provided on the cross bar (951).

6. The wastewater treatment process according to claim 1, characterized in that: The rotating assembly (9) comprises a rotating disk (91), a rotating gear (92) and a knob (93); the rotating disk (91) is rotatably connected to the lifting block (82); the rotating gear (92) is coaxially mounted on the rotating disk (91); and the knob (93) is transmission-connected to the rotating gear (92).

7. The wastewater treatment process according to claim 1, characterized in that: The filter plate (61) is provided with a plurality of baffles (65), the baffles (65) enclosing a filter cavity (66) on the filter plate (61), and a plurality of filter strips (67) are installed on the inner wall of the baffle (65), the cross section of the filter strips (67) being inverted V-shaped, and the filter strips (67) are arranged at intervals along the length direction of the filter plate (61).

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