Device for effectively reducing COD (Chemical Oxygen Demand) content of saponin acidification wastewater

Abstract

The utility model discloses a device for effectively reducing COD (Chemical Oxygen Demand) content of gleditsia sinensis acidification wastewater. The aeration assembly is arranged in the aeration tank; the electrode group is arranged in the aeration tank; and a sedimentation tank. According to the device for effectively reducing the COD (Chemical Oxygen Demand) content of the gleditsia sinensis lam acidification wastewater provided by the utility model, the aeration tank and the aeration component are arranged to fully aerate the gleditsia sinensis lam acidification wastewater entering the aeration tank, so that the oxygen content in water is increased, the oxidation efficiency is improved, and the COD content is effectively reduced; by arranging the battery pack, the removal efficiency of the total COD content is further improved; by arranging the settling pond and the mud scraping plate, under the action of microorganisms, part of organic substances remaining in the sewage are decomposed into inorganic substances, and the COD content in the gleditsia sinensis acidified water is effectively reduced.

Description

Technical Field

[0001] This utility model relates to a device for effectively reducing the COD content of soapberry acidification wastewater. Background Technology

[0002] Soapberry oil is a byproduct of the alkali refining process in vegetable oil refining. Its main components are sodium fatty acid salts, neutral oil, water, and some impurities. When acidifying soapberry oil to recover useful substances such as fatty acids, sulfuric acid and other acids are added to react. After the reaction, separation and washing processes generate a large amount of wastewater, known as soapberry oil acidification wastewater. This wastewater contains pollutants such as oil, fatty acids, saponins, and sulfates, and is characterized by high COD, high salinity, low pH, and complex pollutant composition. Effective wastewater treatment is required before discharge. Chinese Patent Application No. 201921282656.1 discloses a COD removal device for wastewater treatment, including a mixing tank, a stirring rod, an aeration plate, and a stirring plate. The mixing tank has a cylindrical structure with a hollow interior and a stirring chamber. The aforementioned utility model, by incorporating a stirring plate and a stirring rod, rotates the stirring plate under the drive of the stirring rod, agitating the water flow. Simultaneously, air is introduced through an aeration plate, increasing the oxygen content in the water and improving oxidation efficiency, thereby achieving more thorough COD removal. However, because the wastewater rotates under the drive of the stirring rod, it easily forms eddies. The wastewater rotates around the center of these eddies, making it difficult for the aeration gas to diffuse evenly into the wastewater, resulting in reduced oxidation efficiency and failing to achieve the expected COD removal effect. Furthermore, it is unsuitable for reducing the COD content of soapberry acidification wastewater. Therefore, there is an urgent need to propose an effective device for reducing the COD content of soapberry acidification wastewater to solve the above-mentioned technical problems. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] Another objective of this invention is to provide an effective device for reducing the COD content of soapberry acidification wastewater. By setting up an aeration tank and aeration components, the soapberry acidification wastewater entering the aeration tank is fully aerated, increasing the oxygen content in the water, improving oxidation efficiency, and effectively reducing the COD content. By setting up a battery pack, not only can the COD content be further reduced, but the wastewater color can also be reduced, and small amounts of ammonia nitrogen in the wastewater can be removed, improving the overall COD removal efficiency. By setting up a sedimentation tank and sludge scrapers, microorganisms decompose some of the organic matter remaining in the wastewater into inorganic matter, further reducing the COD content. Ultimately, this effectively reduces the COD content in the soapberry acidification wastewater.

[0005] To achieve these objectives and other advantages according to this invention, an effective device for reducing the COD content of soapberry acidification wastewater is provided, comprising:

[0006] The aeration tank has a sludge outlet I at the bottom and a wastewater inlet on the side wall of the aeration tank.

[0007] An aeration assembly, installed inside an aeration tank, includes two stirring shafts positioned near the inlet of the aeration tank; multiple stirring blades evenly spaced on the two stirring shafts, with the blades staggered vertically; each stirring blade includes a support shaft, one end of which is fixed to any stirring shaft; a guide frame inclinedly mounted on the support shaft; multiple through holes evenly spaced on the guide frame; an inner stirring blade rotatably mounted on the stirring shaft, positioned within the inner frame of the guide frame, and not in contact with the guide frame; and multiple aeration discs positioned below the stirring blades, interconnected via pipes.

[0008] An electrode assembly is installed inside the aeration tank, positioned near the outlet of the aeration tank, and electrically connected to an external power source; and

[0009] The sedimentation tank includes a sludge scraper; a sludge outlet II located at the bottom of the sedimentation tank; a return outlet located near the bottom of the sedimentation tank, the return outlet being connected to the return inlet of the aeration tank via a return pipe; and an outlet located on the side wall of the sedimentation tank, which is vertically higher than the return outlet.

[0010] Preferably, it also includes: multiple guide caps, which are respectively disposed near multiple through holes, and any guide cap disposed at any through hole is disposed on the side near the inner blade of the agitator, and the guide port of any guide cap faces the outside of the guide frame.

[0011] Preferably, it also includes: a baffle, which is vertically disposed between the aeration component and the electrode assembly, the upper end of the baffle being lower than the water level of the aeration tank, and the lower end of the baffle not contacting the bottom of the aeration tank; and multiple through holes II, which are evenly distributed in the lower middle part of the baffle.

[0012] Preferably, the guide frame is a rectangular frame or an elliptical frame.

[0013] Preferably, it further includes: a filter belt, which is rotatably and obliquely disposed near the aeration assembly via a pair of rollers, with one end of the filter belt extending into the water body of the aeration tank and the other end of the filter belt extending obliquely upward out of the aeration tank; a perforated plate, which is evenly spaced and transversely disposed on the filter belt, and the aspect ratio of any perforated plate is 2:1 to 3:1; and a motor, which drives the pair of rollers to rotate.

[0014] Preferably, the diameter of the multiple through holes is greater than or equal to 2 cm; the diameter of the multiple through holes II is greater than or equal to 4 cm.

[0015] This utility model has at least the following beneficial effects:

[0016] In the aeration assembly, multiple stirring blades rotate under the drive of two stirring shafts, causing large-area water agitation. This promotes the combination of organic matter and oxygen in the wastewater, causing the organic matter to float to the surface with the air bubbles. Furthermore, multiple through holes, driven by the rotation of the stirring blades, divert and split the water flow, increasing the direction of water movement and further promoting the combination of organic matter and oxygen in the wastewater. This also prevents the formation of eddies at the stirring shafts. Additionally, the inner stirring blades rotate within the stirring blades under the impact and inertia of the water flow, agitating the local water near the inner stirring blades. This, combined with the multiple through holes, creates mixed flow within the wastewater, further preventing eddies at the stirring shafts, increasing oxygen content, and avoiding uneven oxygen distribution.

[0017] In summary, the device for effectively reducing COD content in soapberry acidification wastewater provided by this utility model fully aerates the soapberry acidification wastewater entering the aeration tank by setting up an aeration tank and aeration components, increasing the oxygen content in the water, improving oxidation efficiency, and effectively reducing COD content. By setting up a battery pack, not only can the COD content be further reduced, but the color of the wastewater can also be reduced, and a small amount of ammonia nitrogen in the wastewater can be removed, thereby improving the overall COD removal efficiency. By setting up a sedimentation tank and a sludge scraper, some of the organic matter remaining in the wastewater is decomposed into inorganic matter by the action of microorganisms, further reducing COD content. Ultimately, the COD content in soapberry acidification wastewater is effectively reduced.

[0018] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device for effectively reducing COD content in soapberry acidification wastewater according to one embodiment of the present invention;

[0020] Figure 2 This is a top view schematic diagram of the device for effectively reducing COD content in soapberry acidification wastewater according to one embodiment of the present invention;

[0021] Figure 3 This is a structural schematic diagram of the cross-section of any one of the plurality of stirring blades in one embodiment of the present invention;

[0022] Figure 4 This is a top view of the device for effectively reducing COD content in soapberry acidification wastewater in another embodiment of the present invention.

[0023] Figure 5 This is a structural schematic diagram of the cross-section of the aeration tank in one embodiment of the present invention, wherein a baffle is shown;

[0024] Figure 6 This is a front view structural diagram of any one of the plurality of stirring blades in one embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the cross-section of the aeration tank in one embodiment of the present invention, showing the filter belt. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0027] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0028] like Figures 1-3 As shown, this utility model provides an effective device for reducing the COD content of soapberry acidification wastewater, comprising: an aeration tank 1 with a drain outlet Ⅰ101 at its bottom; a wastewater inlet 102 located on the side wall of the aeration tank; an aeration assembly 2 located inside the aeration tank, the aeration assembly including two stirring shafts 201 located near the inlet of the aeration tank; multiple stirring blades 202 evenly spaced on the two stirring shafts, the multiple stirring blades on the two stirring shafts being staggered in the vertical direction, the water flow between the staggered stirring blades interfering with each other to form mixed flow, which also avoids the formation of large eddies at any stirring shaft; each stirring blade including a support shaft, one end of which is fixed to any stirring shaft; a guide frame 2021 inclinedly located on the support shaft; and multiple through holes 2022 evenly distributed on the guide frame. The system includes: an inner stirring blade 2023, which is rotatably mounted on the stirring shaft and is housed within the inner frame of the guide frame, without contact between the inner stirring blade and the guide frame; multiple aeration discs 2024, which are positioned below the multiple stirring blades and are interconnected via pipes; an electrode assembly 3, which is located within the aeration tank and positioned near the outlet of the aeration tank, and is electrically connected to an external power source 4; a sedimentation tank 5, which includes a sludge scraper 501; a sludge outlet II 502, located at the bottom of the sedimentation tank; a return outlet 503, located near the bottom of the sedimentation tank, with the return outlet connected to the return inlet 103 of the aeration tank via a return pipe, in which case a pump is installed; and an outlet 504, located on the side wall of the sedimentation tank, which is vertically higher than the return outlet.

[0029] In this design, multiple stirring blades in the aeration assembly rotate under the drive of two stirring shafts, causing large-area water agitation. This promotes the combination of organic matter and oxygen in the wastewater, causing the organic matter to float to the surface with the air bubbles. Furthermore, multiple through-holes, driven by the rotation of the stirring blades, divert and split the water flow, increasing the direction of water movement and further promoting the combination of organic matter and oxygen in the wastewater. This also prevents the formation of eddies at the stirring shafts. Additionally, the inner stirring blades rotate within the stirring blades under the impact and inertia of the water flow, agitating the local water near the inner stirring blades. This, combined with the multiple through-holes, creates mixed flow within the wastewater, further preventing eddies at the stirring shafts, increasing oxygen content, and avoiding uneven oxygen distribution.

[0030] In summary, the device for effectively reducing COD content in soapberry acidification wastewater provided by this utility model fully aerates the soapberry acidification wastewater entering the aeration tank by setting up an aeration tank and aeration components, increasing the oxygen content in the water, improving oxidation efficiency, and effectively reducing COD content. By setting up a battery pack, not only can the COD content be further reduced, but the color of the wastewater can also be reduced, and a small amount of ammonia nitrogen in the wastewater can be removed, thereby improving the overall COD removal efficiency. By setting up a sedimentation tank and a sludge scraper, some of the organic matter remaining in the wastewater is decomposed into inorganic matter by the action of microorganisms, further reducing the COD content. Ultimately, the COD content in the soapberry acidification water is effectively reduced. In a preferred embodiment, it also includes: multiple guide caps, which are correspondingly set near multiple through holes, and any guide cap set at any through hole is located on the side near the inner blade of the agitator, with the guide port of any guide cap facing the outside of the guide frame. Multiple guide caps direct the water flowing through multiple through holes to disperse outwards around the stirring blades, so that it can collide with the main water flow driven by the stirring blades, increasing the contact area between water and air and improving dissolved oxygen levels.

[0031] like Figure 4 , 5 As shown, a preferred embodiment further includes: a baffle 6, which is vertically installed between the aeration component and the electrode group. The upper end of the baffle is positioned below the water level 10 in the aeration tank, and the lower end of the baffle does not contact the bottom of the aeration tank; multiple through holes II 601 are evenly distributed in the lower middle part of the baffle. The baffle is used to shield the water body, so that under the stirring action of the aeration component, most of the water body remains around the stirring shaft, maximizing contact with the pumped air, increasing the dissolved oxygen content, and causing most of the organic matter to quickly float to the surface with the air bubbles. Meanwhile, the wastewater at the bottom diffuses to the surrounding area under the stirring action of the stirring blades, flows through the multiple through holes II and the bottom of the baffle to the electrode group, and circulates around the electrodes. Through the catalytic anode catalysis of the electrodes, the organic matter is oxidized and removed. Overall, the two components work together to effectively reduce the COD content of the soapberry acidification wastewater.

[0032] like Figure 6 As shown, in a preferred embodiment, the guide frame is a rectangular frame or an elliptical frame.

[0033] like Figure 7 As shown, a preferred embodiment further includes: a filter belt 7, which is rotatably and obliquely positioned near the aeration assembly via a pair of rollers 8, with one end of the filter belt extending into the water body of the aeration tank and the other end extending obliquely upward out of the aeration tank; perforated plates 701, which are evenly spaced laterally arranged on the filter belt, with the aspect ratio of any perforated plate being 2:1 to 3:1; and a motor driving the pair of rollers to rotate. In this embodiment, the rotation of the filter belt filters and carries suspended sludge out of the aeration tank, thereby effectively removing suspended sludge from the wastewater in the aeration tank.

[0034] In a preferred embodiment, the diameter of multiple through holes is greater than or equal to 2 cm; the diameter of multiple through holes II is greater than or equal to 4 cm.

[0035] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A device for effectively reducing the COD content of soapberry acidified wastewater, characterized in that, The utility model relates to a sewage treatment device, which comprises: an aeration tank provided with a sewage outlet I at the bottom thereof and a wastewater inlet on the side wall thereof; an aeration assembly arranged in the aeration tank, the aeration assembly comprising two stirring shafts arranged near the water inlet of the aeration tank, a plurality of stirring blades uniformly spaced apart and arranged on the two stirring shafts, the plurality of stirring blades on the two stirring shafts being arranged in a staggered manner in the vertical direction, any stirring blade comprising a support shaft fixed at one end to any stirring shaft, a flow guide frame arranged obliquely on the support shaft, a plurality of through holes uniformly formed on the flow guide frame, a stirring inner blade rotatably arranged on the stirring shaft and arranged in the containing space of the inner frame of the flow guide frame, the stirring inner blade not being in contact with the flow guide frame, and a plurality of aeration discs arranged below the plurality of stirring blades and connected to each other by pipelines; an electrode group arranged in the aeration tank and arranged near the water outlet of the aeration tank, the electrode group being electrically connected to an external power supply; and a sedimentation tank comprising a mud scraper, a sewage outlet II arranged at the bottom of the sedimentation tank, and a backflow outlet arranged near the bottom of the sedimentation tank and connected to the backflow inlet of the aeration tank by a backflow pipe, a water outlet arranged on the side wall of the sedimentation tank and vertically higher than the backflow outlet. Further comprising:

2. The device for reducing the COD content of ginkgo acidified wastewater according to claim 1, characterized in that, a plurality of flow guide caps arranged one by one near the plurality of through holes, any flow guide cap arranged near any through hole being arranged near one side of the stirring inner blade, and the flow guide opening of any flow guide cap facing the outer side of the flow guide frame. Further comprising:

3. The device for reducing the COD content of ginkgo acidified wastewater according to claim 1, characterized in that, a baffle vertically arranged between the aeration assembly and the electrode group, the upper end of the baffle being arranged at a height lower than the water level of the aeration tank, and the lower end of the baffle not being in contact with the bottom of the aeration tank, a plurality of through holes II uniformly formed in the middle and lower part of the baffle. The flow guide frame is a rectangular frame or an elliptical frame.

4. The device for reducing the COD content of soapberry acidification wastewater according to claim 1, characterized in that, Further comprising:

5. The device for reducing the COD content of ginkgo acidified wastewater according to claim 1, characterized in that, a filter screen belt rotatably and obliquely arranged near the aeration assembly by a pair of roller shafts, one end of the filter screen belt extending into the water body of the aeration tank, and the other end of the filter screen belt extending obliquely upward out of the aeration tank, a plurality of porous plates uniformly and horizontally spaced apart and arranged on the filter screen belt, the length-width ratio of any porous plate being 2:1-3:1, and a motor driving the pair of roller shafts to rotate. The diameter of the plurality of through holes is greater than or equal to 2 cm, and the diameter of the plurality of through holes II is greater than or equal to 4 cm.

6. The device for reducing the COD content of soapberry acidification wastewater according to claim 3, characterized in that, ​

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