Integrated device and method for removing hardness and COD (Chemical Oxygen Demand) of high-salinity wastewater

Abstract

The invention discloses an integrated device and method for removing hardness and COD (Chemical Oxygen Demand) of high-salt-content wastewater, and solves the problems of high construction cost, large occupied area, multiple control points and poor water quality fluctuation adaptability in the existing high-salt-content wastewater softening treatment process. The upper end of the outer bin body is open, and the two first water pumps are arranged outside the outer bin body; two parallel vertical partition plates are arranged in the outer bin body and divide the interior of the outer bin body into three parallel areas, namely a first area located in the middle and two second areas located on the two sides of the first area respectively. A biochemical component is arranged in the first area and is used for removing COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus and suspended matters in the to-be-treated high-salinity wastewater; a softening assembly and an oxidizing assembly are arranged in the second area; the softening assembly is used for removing the hardness of calcium and magnesium in the to-be-treated high-salt-content wastewater; and the oxidation assembly is used for removing COD in the to-be-treated high-salt wastewater again.

Description

An integrated device and method for removing hardness and COD from high-salinity wastewater Technical Field

[0001] This invention relates to a device and method for treating high-salinity wastewater, specifically to an integrated device and method for removing hardness and COD from high-salinity wastewater. Background Technology

[0002] High-salinity wastewater has become a research hotspot in recent years, with numerous engineering applications. However, this type of wastewater generally suffers from excessively high calcium and magnesium hardness, leading to significant scaling in the downstream evaporation and crystallization process. Due to the complex and diverse composition of high-salinity wastewater, and its difficulty in degradation, improper treatment can cause blockages in the evaporator and pipelines. This not only undermines the system's stable and reliable operation but also reduces the quality of the product salt, making it difficult to separate qualified product salt.

[0003] To address the aforementioned issues, traditional processes typically involve installing an ion exchange resin tank at the upstream end to soften the wastewater, primarily removing calcium and magnesium hardness. Subsequent multi-stage membrane concentration then results in the recycling of the desalinated water, while the concentrated wastewater enters the advanced oxidation treatment unit. However, the calcium and magnesium hardness in the concentrated wastewater significantly increases after multi-stage membrane concentration, leading to two major problems: first, it clogs the advanced oxidation treatment unit, affecting COD removal efficiency; second, it degrades the quality of the salt, rendering it hazardous waste.

[0004] To address this issue, existing designs require an additional softening step between membrane concentration and advanced oxidation treatment, essentially necessitating a separate ion exchange resin tank. However, this approach suffers from drawbacks such as high construction costs, large footprint, and numerous control points. Furthermore, in practical applications, significant fluctuations in water quality often lead to malfunctions in the softening system, or difficulties in regenerating degraded resin, resulting in poor softening performance. Therefore, there is an urgent need for a cost-effective and efficient high-salinity wastewater treatment device. Summary of the Invention

[0005] The purpose of this invention is to overcome the technical problems of high engineering cost, large land area, many control points, poor adaptability to water quality fluctuations, and unstable softening effect in the existing high salinity wastewater softening treatment process, and to provide an integrated device and method for removing hardness and COD from high salinity wastewater.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides an integrated device for removing hardness and COD from high-salinity wastewater, characterized in that: it includes an outer chamber with an open upper end and two first water pumps disposed outside the outer chamber; the outer chamber is provided with two parallel vertical partitions, dividing the outer chamber into three parallel regions, namely a first region located in the middle and two second regions located on both sides of the first region; the two second regions have the same structure and are symmetrically arranged about the first region; the first region and the second region are connected by first and second flap gates disposed on both sides of the corresponding vertical partitions; the first region is provided with a biochemical component for removing COD from the high-salinity wastewater to be treated. The second region contains ammonia nitrogen, total phosphorus, and suspended solids. A first horizontal partition divides the second region into a lower softening zone and an upper oxidation zone. An inlet pipe is installed on the outer wall of the softening zone, which contains a softening component to remove calcium and magnesium hardness from the high-salinity wastewater. A first and second flap valve correspond to the softening zone. An outlet pipe is installed on the outer wall of the oxidation zone, which contains an oxidation component to further remove COD from the high-salinity wastewater. The input ends of two first water pumps are connected to the first region, and their output ends are connected to the two second regions and correspond to the two oxidation components, respectively, to pump the biochemically treated high-salinity wastewater into the oxidation zone.

[0007] Furthermore, the softening component includes a first pipe and modified zeolite arranged sequentially from top to bottom, as well as a plurality of first mushroom-shaped filter heads; a first space is provided between the first pipe and the modified zeolite, and the first pipe is connected to the water inlet pipe; a second space is provided between the modified zeolite and the inner bottom of the softening area; the first flap gate and the second flap gate correspond to the second space; the plurality of first mushroom-shaped filter heads are evenly distributed on the first pipe, the tail of the first mushroom-shaped filter head is connected to the first pipe, and its head is located in the first space and faces the crystal.

[0008] Furthermore, the outer wall of the softening area is also provided with a drain pipe and a purification pipe, and crystals are also provided inside the pipe; the crystals are located above the modified zeolite; a plurality of second mushroom-shaped filter heads are provided at the bottom of the modified zeolite; the plurality of second mushroom-shaped filter heads are evenly distributed at the bottom of the modified zeolite, with the heads of the second mushroom-shaped filter heads facing upwards and embedded in the modified zeolite, and their tails located in the second space; the drain pipe corresponds to the first space above the crystals; the purification pipe corresponds to the second space.

[0009] Furthermore, the biochemical component includes a second horizontal partition and a straw packing material arranged sequentially from bottom to top within the first region; the second horizontal partition divides the first region into a third space located below and a fourth space located above; the first and second flapping gates correspond to the third space; a plurality of third mushroom-shaped filter heads are evenly distributed on the second horizontal partition; the third mushroom-shaped filter heads pass through the second horizontal partition, with their tails located in the third space and their heads located in the fourth space and facing the straw packing material; a microbial film is attached to the outer surface of the straw packing material; and an aeration pipe communicating with the outside is provided at the bottom of the third space.

[0010] Furthermore, the biochemical component also includes a third horizontal partition and an MBR flat sheet membrane arranged sequentially from bottom to top in the first region and located above the straw packing material; the third horizontal partition is provided with a third flap gate; the upper end of the MBR flat sheet membrane corresponds to the input end of the first water pump.

[0011] Furthermore, the oxidation assembly includes multiple flow guide walls and multiple ultraviolet lamps disposed within the oxidation area, and a hydrogen peroxide container disposed outside the oxidation area; the multiple flow guide walls are staggered to form an S-shaped channel; the output end of the S-shaped channel is disposed close to the water outlet pipe; the multiple ultraviolet lamps are respectively disposed between each pair of adjacent flow guide walls; the hydrogen peroxide container is connected to the input end of the S-shaped channel through a hydrogen peroxide dosing pipe.

[0012] Furthermore, it also includes two return water pipes symmetrically distributed above the two second areas; one end of the return water pipe is connected to the outlet water pipe, and the other end is connected to the input end of the S-shaped channel. A second water pump and a COD online monitoring instrument are provided in the middle of the return water pipe.

[0013] Furthermore, an installation bracket spanning the first region and two second regions is provided above the outer chamber; the body of the first water pump is mounted on the installation bracket; the ultraviolet lamp is installed between the installation bracket and the first horizontal partition; a plurality of the flow guide walls are spaced apart on the installation bracket and the first horizontal partition; and the other end of the return water pipe passes through the installation bracket.

[0014] Furthermore, the microbial film is a Halomonas film, a Bacillus subtilis film, or a Bacillus licheniformis film; the mass ratio of the microbial film to the straw filler is in the range of 1:4 to 1:5; inspection ports are respectively provided on the outer walls of the first space and the second space; a water outlet channel is provided on the outer wall of the oxidation zone near its upper end; the water outlet pipe is connected to the water outlet channel.

[0015] This invention also provides a method for removing hardness and COD from high-salinity wastewater, employing the aforementioned integrated device for removing hardness and COD from high-salinity wastewater. Its key feature is the inclusion of the following steps: Step 1: The softening zone within the outer chamber receives the high-salinity wastewater to be treated through an inlet pipe; Step 2: The softening component removes calcium and magnesium hardness from the high-salinity wastewater, after which the wastewater enters the first zone through a first and second gate; Step 3: The biochemical component removes COD, ammonia nitrogen, total phosphorus, and suspended solids from the high-salinity wastewater; Step 4: A first water pump pumps the high-salinity wastewater from the first zone into an oxidation zone; Step 5: The oxidation component further removes COD from the high-salinity wastewater, after which the wastewater exits the outer chamber through an outlet pipe, completing the removal of hardness and COD from the high-salinity wastewater.

[0016] Further, step 1 specifically involves the first pipe inside the outer chamber receiving the high-salinity wastewater to be treated through the inlet pipe; step 2 specifically involves the first mushroom-shaped filter head spraying the high-salinity wastewater to be treated downwards evenly, and when the high-salinity wastewater to be treated passes through the crystals and modified zeolite, the crystals and modified zeolite remove the calcium and magnesium ions, and then the high-salinity wastewater to be treated enters the second space, and enters the third space of the first area through the first and second flap gates.

[0017] Further, step 3 specifically involves the third mushroom-shaped filter head uniformly conveying the high-salinity wastewater to be treated to the straw packing material with attached microbial film. The straw packing material with attached microbial film degrades COD, ammonia nitrogen, and total phosphorus in the high-salinity wastewater. Afterward, the high-salinity wastewater flows to the MBR flat sheet membrane through the third flap gate, and the MBR flat sheet membrane removes suspended solids from the high-salinity wastewater.

[0018] Further, step 4 specifically involves pumping the high-salinity wastewater to be treated, after the removal of suspended solids, from the first area into the oxidation area using a first water pump; step 5 specifically includes: step 5.1, adding hydrogen peroxide from a hydrogen peroxide container into the S-shaped channel within the oxidation area via a hydrogen peroxide dosing pipe. The hydrogen peroxide in the S-shaped channel synergistically generates hydroxyl radicals with the ultraviolet light produced by the ultraviolet lamp. The hydroxyl radicals, ultraviolet light, and hydrogen peroxide work together to remove organic matter from the high-salinity wastewater, thereby further reducing the COD content. The high-salinity wastewater is then discharged from the outer chamber through an outlet pipe; step 5.2, detecting the COD content in the discharged high-salinity wastewater using an online COD monitor; if the COD content is greater than a preset threshold, the discharged high-salinity wastewater is pumped back into the oxidation area using a second water pump, and the process returns to step 5.1, until the COD content in the discharged high-salinity wastewater is less than or equal to the preset threshold, completing the removal of hardness and COD from the high-salinity wastewater.

[0019] The beneficial effects of the present invention are as follows: 1. The integrated device and method for removing hardness and COD from high-salinity wastewater provided by the present invention not only has a small footprint and low cost, but also makes the high-salinity wastewater treatment process more centralized and easier to control.

[0020] 2. In this invention, the water inlet of the softening zone is evenly distributed through the mushroom-shaped filter head, making full use of the working exchange capacity of the modified zeolite. It can effectively soften the calcium and magnesium hardness of high-salt wastewater. Moreover, the modified zeolite turns waste into treasure and can be reused. The crystals can absorb the regenerated calcium ions to make calcium carbonate solid, thus achieving resource optimization.

[0021] 3. In this invention, crystals are set above the modified zeolite within the softening area, and a second mushroom-shaped filter head is set at the bottom of the modified zeolite. Purification pipes and drainage pipes are also set on the side wall of the softening area. The modified zeolite can be rinsed and regenerated using regeneration liquid. After regeneration, the calcium ions of the gyroscope adhere to the crystals, and the crystals are made into calcium carbonate, thus realizing the resource utilization of pollutants.

[0022] 4. The present invention uses the first to third flap gates to control the water flow connection between the softening zone, the first zone (biochemical zone) and the oxidation zone, thereby achieving unmanned management, reducing the number of intermediate water pumps used, saving costs, improving operational reliability and reducing the failure rate.

[0023] 5. The lower layer of the first region (biochemical region) of this invention uses waste straw filler, turning waste into treasure, reducing the burning of waste straw and secondary pollution to the environment. The upper layer uses MBR flat sheet membrane, which effectively shares an aeration pipe with the lower layer through the third flap gate, saving equipment space and energy consumption. The upper layer uses salt-tolerant activated sludge treatment method, and the lower layer uses salt-tolerant biofilm treatment method, effectively utilizing microorganisms that can degrade COD.

[0024] 6. The oxidation zone of this invention uses a combination of ultraviolet lamps and hydrogen peroxide to generate a synergistic effect of hydroxyl radicals, ultraviolet light, and hydrogen peroxide; the ultraviolet lamps and the flow guide wall are arranged alternately to increase the contact area between the oxidants and oxidants and the organic matter in the wastewater, thereby improving the oxidation efficiency and effect.

[0025] 7. The present invention has a return water pipe installed in the oxidation zone, which can monitor the COD content of the high-salt wastewater in the output outer chamber online, and selectively adjust the effluent return flow for further treatment in order to accurately achieve the preset treatment effect. Attached Figure Description

[0026] Figure 1 is a schematic diagram of an embodiment of the integrated device for removing hardness and COD from high-salinity wastewater according to the present invention.

[0027] The attached diagram is labeled as follows: 1. Outer chamber; 11. Vertical partition; 12. First flap gate; 13. Second flap gate; 14. First horizontal partition; 15. Softening zone; 151. First space; 152. Second space; 16. Oxidation zone; 17. Inlet pipe; 18. Outlet pipe; 19. Drainage pipe; 110. Purification pipe; 111. Inspection port; 112. Outlet channel; 2. First water pump; 31. First pipeline; 32. Crystal; 33. Modified zeolite; 34. Second mushroom-shaped filter head; 35. First mushroom-shaped filter head; 41. Second horizontal baffle; 42. Straw packing; 43. Third space; 44. Fourth space; 45. Third mushroom-shaped filter head; 46. Aeration pipe; 47. Third horizontal baffle; 48. MBR flat sheet membrane; 49. Third flap valve; 51. Guide wall; 52. Ultraviolet lamp; 53. Hydrogen peroxide container; 54. Hydrogen peroxide dosing pipe; 6. Return water pipe; 7. Second water pump; 8. Mounting bracket. Detailed Implementation

[0028] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The present invention provides an integrated device for removing hardness and COD from high-salinity wastewater, as shown in Figure 1. The integrated device includes an outer chamber 1 with an open top and two first water pumps 2 disposed outside the outer chamber 1.

[0030] The outer chamber 1 is made of concrete. Inside the outer chamber 1, there are two parallel vertical partitions 11, which divide the interior of the outer chamber 1 into three parallel areas: a first area located in the middle and two second areas located on both sides of the first area. The two second areas have the same structure and are symmetrically arranged about the first area. The first area and the second area are connected by a first flap door 12 and a second flap door 13 located on both sides of the corresponding vertical partitions 11. An installation bracket 8 spanning the first area and the two second areas is provided above the outer chamber 1. The first area is the biochemical area.

[0031] The second region is provided with a first horizontal partition 14 in the middle, which divides the second region into a softening region 15 located below and an oxidation region 16 located above; the outer wall of the softening region 15 is provided with a water inlet pipe 17, and a softening component is provided inside it to remove calcium and magnesium hardness from the high salinity wastewater to be treated.

[0032] The softening assembly includes a first pipe 31, a crystal 32, and a modified zeolite 33 arranged sequentially from top to bottom, as well as multiple second mushroom-shaped filter heads 34 and multiple first mushroom-shaped filter heads 35; a first space 151 is provided between the first pipe 31 and the crystal 32, and the first pipe 31 is connected to the water inlet pipe 17; a second space 152 is provided between the modified zeolite 33 and the inner bottom of the softening area 15; inspection ports 111 are respectively provided on the outer walls of the first space 151 and the second space 152 for easy maintenance; a first flap gate 12 and a second flap gate 13 correspond to the second space 152; multiple first mushroom-shaped filter heads 35 are evenly distributed on the first pipe 31, the tail of the first mushroom-shaped filter head 35 is connected to the first pipe 31, and its head is located in the first space 151 and faces the crystal 32; multiple second mushroom-shaped filter heads 34 are evenly distributed at the bottom of the modified zeolite 33, the head of the second mushroom-shaped filter head 34 is embedded in the modified zeolite 33 with its head facing upward, and its tail is located in the second space 152. The outer wall of the softening area 15 is also provided with a drain pipe 19, a purification pipe 110 and an inspection port 111; the drain pipe 19 corresponds to the first space 151 above the crystal 32; the purification pipe 110 corresponds to the second space 152.

[0033] The outlet holes of the second mushroom-shaped filter head 34 and the first mushroom-shaped filter head 35 are pentagonal star-shaped holes, used to evenly distribute water onto the crystal 32 and modified zeolite 33, increasing the effective contact area between the incoming water and the modified zeolite 33, and fully utilizing the working exchange capacity of the modified zeolite 33 surface. The purification pipe 110 corresponds to the area below the modified zeolite 33, and the drain pipe 19 corresponds to the area above the crystal 32. Regeneration liquid is introduced into the second space 152 through the purification pipe 110. The regeneration liquid can rinse and regenerate the modified zeolite 33 through the second mushroom-shaped filter head 34. The calcium ions detached after rinsing and regeneration can adhere to the crystal 32, converting the crystal 32 into calcium carbonate, thus realizing the resource utilization of pollutants. The regeneration liquid uses hydrochloric acid with a mass concentration of 3-5% and sodium hydroxide with a mass concentration of 3-5%.

[0034] The first area is equipped with biochemical components to remove COD, ammonia nitrogen, total phosphorus, and suspended solids from the high-salinity wastewater to be treated.

[0035] The biochemical assembly includes a second horizontal partition 41 and a straw packing 42 arranged sequentially from bottom to top in the first region, and a third horizontal partition 47 and an MBR flat sheet membrane 48 arranged sequentially from bottom to top in the first region and located above the straw packing 42. The second horizontal partition 41 divides the first region into a lower third space 43 and an upper fourth space 44. The first flap gate 12 and the second flap gate 13 correspond to the third space 43. A plurality of third mushroom head filter heads 45 are evenly distributed on the second horizontal partition 41. The third mushroom head filter heads 45 are inserted through the second horizontal partition 41, with their tails located in the third space 43 and their heads located in the fourth space 44 and facing the straw packing 42. A microbial film is attached to the outer surface of the straw packing 42. The microbial film is a Halomonas film, a Bacillus subtilis film, or a Bacillus licheniformis film. The mass ratio of the microbial film to the straw packing is in the range of 1:4 to 1:5, and in this embodiment it is 1:4. An aeration pipe 46 communicating with the outside is provided at the bottom of the third space 43. The third horizontal partition 47 is provided with a third flap gate 49; the upper end of the MBR flat sheet membrane 48 corresponds to the input end of the first water pump 2, and the MBR flat sheet membrane 48 is used for the growth of salt-tolerant activated sludge.

[0036] The outer wall of the oxidation zone 16 is provided with an inspection port 111 and an outlet channel 112. An outlet pipe 18 is provided on the outlet channel 112. An oxidation component is provided inside the oxidation zone 16 for further removal of COD from the high-salinity wastewater to be treated. The oxidation component includes multiple guide walls 51 and multiple ultraviolet lamps 52 set in the oxidation zone 16, and a hydrogen peroxide container 53 set outside the oxidation zone 16. The multiple guide walls 51 are staggered to form an S-shaped channel. The output end of the S-shaped channel is set close to the outlet pipe 18. The multiple ultraviolet lamps 52 are respectively set between each pair of adjacent guide walls 51. The two ends of the ultraviolet lamps 52 are fixed between the mounting bracket 8 and the first horizontal partition 14 by clamps, bolts and nuts. The multiple guide walls 51 are installed at intervals on the mounting bracket 8 and the first horizontal partition 14. The hydrogen peroxide container 53 is connected to the input end of the S-shaped channel through a hydrogen peroxide dosing pipe 54.

[0037] The combined use of ultraviolet lamps and hydrogen peroxide generates hydroxyl radicals, and the synergistic effect of ultraviolet light and hydrogen peroxide reduces and removes COD from the high-salt wastewater to be treated. A continuous guide wall 51 divides the oxidation zone into several "S"-shaped channels, which increases the contact probability between the high-salt wastewater to be treated and hydroxyl radicals, ultraviolet light and hydrogen peroxide, prolongs the reaction time and improves the reaction efficiency.

[0038] The bodies of the two first water pumps 2 are mounted on the mounting bracket 8; the input ends of the two first water pumps 2 are respectively connected to the first area, and their output ends are respectively connected to the two second areas and correspond to the two oxidation components, which are used to pump the high-salt wastewater to be treated by the biochemical components into the oxidation area 16.

[0039] Above each of the two second zones, there is a return water pipe 6; one end of the return water pipe 6 is connected to the outlet water pipe 18, and the other end is installed on the mounting bracket 8 and connected to the input end of the S-shaped channel; a COD online monitoring instrument and a second water pump 7 are installed in the middle of the return water pipe 6.

[0040] The specific process of treating high-salinity wastewater by the above-mentioned integrated device for hardening and COD removal is as follows: Step 1, the first pipe 31 in the outer chamber 1 receives the high-salinity wastewater to be treated through the inlet pipe 17; Step 2, the first mushroom head filter 35 sprays the high-salinity wastewater to be treated downwards evenly. When the high-salinity wastewater to be treated passes through the crystal 32 and the modified zeolite 33, the crystal 32 and the modified zeolite 33 remove the calcium and magnesium ions in it to avoid subsequent scaling. Then the high-salinity wastewater to be treated enters the second space 152 and enters the third space 43 of the first area through the first flap gate 12 and the second flap gate 13.

[0041] Step 3: The third mushroom-shaped filter head 45 evenly conveys the high-salinity wastewater to be treated to the straw packing material 42 with the attached microbial film. The straw packing material 42 with the attached microbial film degrades the COD, ammonia nitrogen and total phosphorus in the high-salinity wastewater. Then, the high-salinity wastewater flows to the MBR flat sheet membrane 48 through the third flap gate 49. The MBR flat sheet membrane 48 removes the suspended solids in the high-salinity wastewater.

[0042] Step 4: Pump the high-salinity wastewater to be treated, after removing suspended solids, from the first zone into the oxidation zone 16 using the first water pump 2; Step 5: Advanced oxidation treatment; Step 5.1: Hydrogen peroxide container 53 adds hydrogen peroxide to the S-shaped channel in the oxidation zone 16 through hydrogen peroxide dosing pipe 54. In the S-shaped channel, the hydrogen peroxide synergistically interacts with the ultraviolet light generated by the ultraviolet lamp 52 to produce a high concentration of hydroxyl radicals. The hydroxyl radicals, ultraviolet light, and hydrogen peroxide work together to remove organic matter from the high-salinity wastewater to be treated, thereby further reducing the concentration of high-salinity wastewater. The COD content in the saline wastewater is measured, and then the high-salinity wastewater to be treated is discharged out of the outer chamber 1 through the effluent pipe 18. Step 5.2: The COD content in the high-salinity wastewater discharged out of the outer chamber 1 is detected by the COD online monitoring instrument. If the COD content is greater than the preset threshold, the high-salinity wastewater to be treated is pumped back into the oxidation zone 16 by the second water pump 7, and the process returns to step 5.1 until the COD content in the high-salinity wastewater discharged out of the outer chamber 1 is less than or equal to the preset threshold, thus completing the removal of hardness and COD from the high-salinity wastewater.

[0043] After prolonged operation, the modified zeolite 33 requires regeneration. The regeneration solution and backwash water enter the second mushroom-shaped filter head 34 through the purification pipe 110, submerging the entire modified zeolite 33. The calcium ions washed off adhere to the crystals 32, turning waste into treasure. The regeneration solution and backwash water are discharged to the external neutralization tank through the drain pipe 19. At this time, the three flap valves are automatically closed, which can effectively prevent the high-salt wastewater from the biochemical zone (i.e., the second zone) and the oxidation zone from flowing back into the softening zone.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated device for removing hardness and COD from high-salinity wastewater, characterized in that: The system includes an outer chamber (1) with an open top and two first water pumps (2) located outside the outer chamber (1). The outer chamber (1) contains two parallel vertical partitions (11), dividing the interior into three parallel regions: a first region in the center and two second regions located on either side of the first region. The two second regions have identical structures and are symmetrically arranged about the first region. The first and second regions are connected by first flap gates (12) and second flap gates (13) located on either side of the corresponding vertical partitions (11). The first region contains a biochemical component for removing COD, ammonia nitrogen, total phosphorus, and suspended solids from the high-salinity wastewater. The second region contains a first horizontal partition (14) in the center, which separates the second... The area is divided into a softening area (15) located below and an oxidation area (16) located above. The softening area (15) is provided with an inlet pipe (17) on its outer wall and a softening component inside, which is used to remove calcium and magnesium hardness from the high-salt wastewater to be treated. The first flap gate (12) and the second flap gate (13) correspond to the softening area (15). The oxidation area (16) is provided with an outlet pipe (18) on its outer wall and an oxidation component inside, which is used to remove COD from the high-salt wastewater to be treated again. The input ends of the two first water pumps (2) are respectively connected to the first area, and their output ends are respectively connected to the two second areas and correspond to the two oxidation components, which are used to pump the high-salt wastewater to be treated treated by the biochemical components into the oxidation area (16).

2. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 1, characterized in that: The softening component includes a first pipe (31) and a modified zeolite (33) arranged sequentially from top to bottom, as well as a plurality of first mushroom head filter heads (35); a first space (151) is provided between the first pipe (31) and the modified zeolite (33), and the first pipe (31) is connected to the water inlet pipe (17); a second space (152) is provided between the modified zeolite (33) and the inner bottom of the softening area (15); the first flap gate (12) and the second flap gate (13) correspond to the second space (152); the plurality of first mushroom head filter heads (35) are evenly distributed on the first pipe (31), the tail of the first mushroom head filter head (35) is connected to the first pipe (31), and its head is located in the first space (151) and faces the crystal (32).

3. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 2, characterized in that: The softened area (15) is also provided with a drain pipe (19) and a purification pipe (110) on its outer wall, and crystals (32) are also provided inside it; the crystals (32) are located above the modified zeolite (33); a plurality of second mushroom head filters (34) are provided at the bottom of the modified zeolite (33); the plurality of second mushroom head filters (34) are evenly distributed at the bottom of the modified zeolite (33), with the heads of the second mushroom head filters (34) facing upward and embedded in the modified zeolite (33), and their tails located in the second space (152); the drain pipe (19) corresponds to the first space (151) above the crystals (32); the purification pipe (110) corresponds to the second space (152).

4. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 1, 2, or 3, characterized in that: The biochemical component includes a second horizontal partition (41) and a straw packing (42) arranged sequentially from bottom to top in the first area; the second horizontal partition (41) divides the first area into a third space (43) located below and a fourth space (44) located above; the first flap gate (12) and the second flap gate (13) correspond to the third space (43); a plurality of third mushroom head filter heads (45) are evenly distributed on the second horizontal partition (41); the third mushroom head filter head (45) passes through the second horizontal partition (41), with its tail located in the third space (43) and its head located in the fourth space (44) and facing the straw packing (42); a microbial film is attached to the outer surface of the straw packing (42); the bottom of the third space (43) is provided with an aeration pipe (46) communicating with the outside.

5. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 4, characterized in that: The biochemical component also includes a third horizontal partition (47) and an MBR flat sheet membrane (48) arranged sequentially from bottom to top in the first region and located above the straw packing (42); the third horizontal partition (47) is provided with a third flap gate (49); the upper end of the MBR flat sheet membrane (48) corresponds to the input end of the first water pump (2).

6. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 5, characterized in that: The oxidation assembly includes multiple flow guide walls (51) and multiple ultraviolet lamps (52) disposed within the oxidation zone (16), and a hydrogen peroxide container (53) disposed outside the oxidation zone (16); the multiple flow guide walls (51) are staggered to form an S-shaped channel; the output end of the S-shaped channel is disposed close to the water outlet pipe (18); the multiple ultraviolet lamps (52) are respectively disposed between each pair of adjacent flow guide walls (51); the hydrogen peroxide container (53) is connected to the input end of the S-shaped channel through a hydrogen peroxide dosing pipe (54).

7. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 6, characterized in that: It also includes two return water pipes (6) symmetrically distributed above the two second areas; one end of the return water pipe (6) is connected to the outlet water pipe (18), and the other end is connected to the input end of the S-shaped channel. A second water pump (7) and a COD online monitoring instrument are provided in the middle of the return water pipe (6).

8. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 7, characterized in that: The outer chamber (1) is provided with a mounting bracket (8) spanning the first area and two second areas; the body of the first water pump (2) is mounted on the mounting bracket (8); the ultraviolet lamp (52) is installed between the mounting bracket (8) and the first horizontal partition (14); a plurality of the flow guide walls (51) are spaced apart on the mounting bracket (8) and the first horizontal partition (14); the other end of the return water pipe (6) passes through the mounting bracket (8).

9. The integrated device for removing hardness and COD from high-salinity wastewater according to claim 8, characterized in that: The microbial film is a Halomonas film, Bacillus subtilis film, or Bacillus licheniformis film; the mass ratio of the microbial film to the straw filler is 1:4 to 1:5; the outer walls of the first space (151) and the second space (152) are respectively provided with inspection ports (111); the outer wall of the oxidation zone (16) is provided with a water outlet channel (112) near its upper end; the water outlet pipe (18) is connected to the water outlet channel (112).

10. A method for removing hardness and COD from high-salinity wastewater, comprising the integrated device for removing hardness and COD from high-salinity wastewater as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1: The softening zone inside the outer chamber (1) receives the high-salinity wastewater to be treated through the inlet pipe (17); Step 2: The softening component removes the calcium and magnesium hardness from the high-salinity wastewater to be treated, and then the high-salinity wastewater to be treated enters the first zone through the first flap gate (12) and the second flap gate (13); Step 3: The biochemical component removes COD, ammonia nitrogen, total phosphorus and suspended solids from the high-salinity wastewater to be treated; Step 4: The first water pump (2) pumps the high-salinity wastewater to be treated from the first zone into the oxidation zone (16); Step 5: The oxidation component removes COD from the high-salinity wastewater to be treated again, and then the high-salinity wastewater to be treated is discharged from the outer chamber (1) through the outlet pipe (18), completing the removal of hardness and COD from the high-salinity wastewater.

11. The method for removing hardness and COD from high-salinity wastewater according to claim 10, characterized in that: Step 1 is specifically that the first pipe (31) inside the outer chamber (1) receives the high-salt wastewater to be treated through the water inlet pipe (17); Step 2 is specifically that the first mushroom head filter (35) sprays the high-salt wastewater to be treated downwards evenly. When the high-salt wastewater to be treated passes through the crystal (32) and modified zeolite (33), the crystal (32) and modified zeolite (33) remove the calcium and magnesium ions in it. Then the high-salt wastewater to be treated enters the second space (152) and enters the third space (43) of the first area through the first flap gate (12) and the second flap gate (13).

12. The method for removing hardness and COD from high-salinity wastewater according to claim 11, characterized in that: Step 3 specifically involves the third mushroom-shaped filter head (45) uniformly conveying the high-salt wastewater to be treated to the straw packing material (42) with the attached microbial film. The straw packing material (42) with the attached microbial film degrades the COD, ammonia nitrogen, and total phosphorus in the high-salt wastewater. Then, the high-salt wastewater flows through the third flap gate (49) to the MBR flat sheet membrane (48), and the MBR flat sheet membrane (48) removes the suspended solids in the high-salt wastewater.

13. The method for removing hardness and COD from high-salinity wastewater according to claim 12, characterized in that: Step 4 specifically involves pumping the high-salinity wastewater to be treated, after the removal of suspended solids, from the first area into the oxidation area (16) using the first water pump (2); Step 5 specifically includes: Step 5.1, adding hydrogen peroxide to the S-shaped channel in the oxidation area (16) through the hydrogen peroxide dosing pipe (54) via the hydrogen peroxide container (53). The hydrogen peroxide in the S-shaped channel works synergistically with the ultraviolet light generated by the ultraviolet lamp (52) to generate hydroxyl radicals. The hydroxyl radicals, ultraviolet light, and hydrogen peroxide work together to remove organic matter in the high-salinity wastewater to be treated, thereby further reducing the high-salinity wastewater to be treated. The COD content is measured, and then the high-salt wastewater to be treated is discharged from the outer chamber (1) through the outlet pipe (18); Step 5.2: The COD content of the high-salt wastewater to be treated in the outer chamber (1) is detected by the COD online monitoring instrument; if the COD content is greater than the preset threshold, the high-salt wastewater to be treated is pumped back into the oxidation zone (16) by the second water pump (7) and returned to step 5.1 until the COD content of the high-salt wastewater to be treated in the outer chamber (1) is less than or equal to the preset threshold, and the removal of COD from the high-salt wastewater is completed.

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