Water treatment method applied to high-density sedimentation tank

Abstract

The application discloses a water treatment method applied to a high-density sedimentation tank, and comprises the following steps: sewage enters a coagulation area through a water inlet, a coagulant is thrown into the coagulation area, and coagulation treatment is performed on the sewage, so that a plurality of small flocculation is formed in the coagulation area; the sewage and the small flocculation treated through the coagulation area enter a loading flocculation area, a flocculant and a loading material are thrown into the loading flocculation area, so that the sewage and the small flocculation are subjected to flocculation under the action of the flocculant, the flocculation is generated with the loading material as a crystal nucleus, the flocculation is attached to the loading material to form larger flocculation; the flocculant comprises polyacrylamide and polyacrylamide, and the loading material comprises micro-sand, garnet and volcanic rock; the flocculation formed in the flocculation area enters a sedimentation area to perform sludge-water separation, and the water separated through the separation is discharged through a water outlet. The application solves the problem that in the prior art, the flocculation has a slow sedimentation speed when water treatment is performed, and the sedimentation effect on special wastewater which is difficult to treat cannot meet the water discharge requirement.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and more specifically, to a water treatment method applied to a high-density sedimentation tank. Background Technology

[0002] Because traditional wastewater treatment methods involve low load, large footprint, and low treatment efficiency in sedimentation tanks, it is necessary to develop or introduce new technologies to address issues such as wastewater overflow pollution, ensuring primary treatment effluent meets standards, and strictly limiting suspended solids (SS) in effluent from advanced treatment processes. To achieve Class A or better effluent standards from wastewater treatment plants, advanced treatment facilities are installed after the conventional secondary treatment process. High-density sedimentation tanks and V-type filters are commonly used in wastewater treatment plants and have shown good operational performance.

[0003] In recent years, based on conventional high-density sedimentation tanks, the addition of loading materials such as micro-sand has increased the design load and ensured treatment efficiency through the weighted flocculation effect of these materials. Compared with traditional high-density sedimentation tanks, this method features higher treatment load, smaller civil engineering footprint, shorter construction period, stronger resistance to shock loads, and stable operation. This type of high-density sedimentation tank operates on the same principle as traditional high-density sedimentation tanks, using coagulants for destabilization, polymeric flocculants to aggregate suspended solids, and inclined tube (plate) sedimentation to remove suspended solids. The improvement in the loaded high-density sedimentation tank process involves adding materials such as micro-sand as "seeds" to form high-density flocs, giving the flocs a higher density and making them easier to remove through sedimentation.

[0004] Current conventional techniques involve adding microsand to high-density sedimentation tanks to artificially increase crystal nuclei in the flocculation reaction, inducing the formation and rapid growth of flocculent particles. This also increases the density of the flocs, resulting in denser, larger particles with faster settling speeds. However, research and application of crystal nuclei from materials other than microsand are limited, making it difficult to break through the upper limit of sedimentation speed. Furthermore, the subtle combination of chemical agents and microsand has a significant impact on the treatment effect in the flocculation zone. Conventional agents used in the flocculation zone of high-density sedimentation tanks are relatively limited in variety, and their sedimentation effect cannot meet the effluent requirements for difficult-to-treat special wastewaters. Summary of the Invention

[0005] The main objective of this application is to provide a water treatment method for use in high-density sedimentation tanks, in order to solve the problems in related technologies where the sedimentation rate of flocculents is slow and the sedimentation effect cannot meet the effluent requirements for difficult-to-treat special wastewater.

[0006] To achieve the above objectives, this application provides a water treatment method applied to a high-density sedimentation tank, wherein the high-density sedimentation tank includes a coagulation zone, a loading flocculation zone, and a sedimentation zone connected in sequence, wherein the coagulation zone is connected to an inlet and the sedimentation zone is connected to an outlet.

[0007] The water treatment method includes:

[0008] Wastewater enters the coagulation zone through the inlet, and coagulant is added to the coagulation zone to coagulate the wastewater, so that several fine flocs are formed in the coagulation zone.

[0009] Wastewater and fine flocs treated in the coagulation zone enter the loading flocculation zone. Flocculant and loading material are added to the loading flocculation zone so that the wastewater and fine flocs, under the action of the flocculant, generate flocs with the loading material as crystal nuclei. The flocs adhere to the loading material to form larger flocs.

[0010] The flocculant includes polyacrylamide and ammonium polyacrylate, and the loading includes micro sand, garnet and volcanic rock;

[0011] The flocculent material formed in the flocculation zone enters the sedimentation zone for mud-water separation, and the separated water is discharged through the outlet.

[0012] Furthermore, the particle size of the micro-sand is 100-150μm, the particle size of the garnet is 200-300μm, and the particle size of the volcanic rock is 100-150μm;

[0013] Furthermore, the ratio of polyacrylamide to ammonium polyacrylate is (7-9):(1-3).

[0014] Furthermore, the ratio of polyacrylamide to ammonium polyacrylate is 8:2.

[0015] Furthermore, the ratio of the micro-sand, the garnet, and the volcanic rock is 6:(2-3):(1-2).

[0016] Furthermore, the ratio of micro-sand, garnet, and volcanic rock is 6:3:1.

[0017] Furthermore, the dosage of the coagulant is 0.05-0.2 mL / L, the dosage of the loading material is 3-5 mg / L, the concentration of the flocculant is 0.05-0.2%, and the dosage of the flocculant is 1-3 mg / L.

[0018] Furthermore, the high-density sedimentation tank also includes a hydrocyclone, the inlet end of which is connected to the sludge discharge port of the sedimentation zone. The hydrocyclone includes an overflow port and a bottom flow port. The bottom flow port is connected to one of the loading material inlets on the loading flocculation zone. The overflow port is connected to a sewage pipe.

[0019] The sludge separated in the sedimentation zone enters the hydrocyclone. After being processed by the hydrocyclone, part of the load enters the loading flocculation zone through the underflow outlet.

[0020] Furthermore, the sedimentation zone includes an inclined plate separation zone, and the outlet corresponds to the inclined plate separation zone. The inclined plate separation zone includes expansion bolts, a support mesh, and an inclined plate module.

[0021] The expansion bolts are arranged in multiples and fixed on the four side walls of the inclined plate separation area. The support net includes crisscrossing support rods. The two ends of the support rods are fixedly connected to the corresponding expansion bolts through connectors. The inclined plate modules are arranged in multiples and stacked on the support net in the horizontal direction. In the vertical direction, adjacent inclined plate modules are fixedly connected.

[0022] Furthermore, the support network is provided with hooks corresponding to the inclined plate module, and at least one plate in the inclined plate module is provided with a connection hole for hooking.

[0023] In this embodiment, wastewater enters the coagulation zone through an inlet. A coagulant is added to the coagulation zone, and the wastewater is treated to form numerous fine flocs. The treated wastewater and fine flocs then enter a loading flocculation zone, where a flocculant and a loading agent are added. Under the action of the flocculant, the wastewater and fine flocs form flocs with the loading agent as nuclei. The flocs adhere to the loading agent, forming larger flocs. The flocculant includes polyacrylamide and ammonium polyacrylate, and the loading agent includes micro-sand, garnet, and volcanic rock. The flocs formed in the flocculation zone... The water enters the sedimentation zone for mud-water separation, and the separated water is discharged through the outlet. On the one hand, this increases the specific gravity and particle size range of the loading material, making the flocs formed around the loading material larger and denser, increasing the density of the formed flocs and improving their settling properties. On the other hand, it can effectively improve the quality of the effluent, increasing the removal rate of turbidity and COD by 5%-10%. The system has higher treatment efficiency and can effectively solve the impact of fluctuations in the influent water quality, ensuring that the effluent water quality is stable and meets the standards. This solves the problem of slow sedimentation rate of flocs in related technologies during water treatment.

[0024] On the other hand, the flocculant composed of polyacrylamide and ammonium polyacrylate can flocculate various water qualities, effectively solve the impact of fluctuations in the influent water quality, ensure stable effluent quality, increase the system's treatment efficiency, and reduce the amount of reagents added. This solves the problem in related technologies where the sedimentation effect for difficult-to-treat special wastewater cannot meet the effluent requirements. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0026] Figure 1 This is a structural schematic diagram of the high-density sedimentation tank according to an embodiment of this application;

[0027] Figure 2 This is a top view of the inclined plate separation area according to an embodiment of this application;

[0028] Figure 3 This is a side view structural diagram of the assembly of the support net and the inclined plate module according to the embodiments of this application;

[0029] Figure 4 This is a schematic diagram of another side view of the assembly of the support net and the inclined plate module according to the embodiments of this application;

[0030] The components include: 1. High-density sedimentation tank; 2. Coagulation zone; 3. Loading flocculation zone; 4. Sedimentation zone; 5. First stirring device; 6. Coagulant dosing pipe; 7. Flocculant dosing pipe; 8. Loading material dosing pipe; 9. Loading material circulation pipe; 10. Hydrocyclone; 11. Support net; 110. Support rod; 12. Inclined plate module; 13. Inclined plate separation zone; 14. Sludge discharge port; 15. Sludge scraping device; 16. Inlet pipe; 17. Guide cylinder; 18. Second stirring device; 19. Flocculant dosing ring; 21. Expansion bolt; 22. Hook; 220. Hook connection part. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0033] In this application, the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0034] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0035] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In addition, the term "multiple" should mean two or more.

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] Current conventional techniques involve adding microsand to high-density sedimentation tanks to artificially increase crystal nuclei in the flocculation reaction, inducing the formation and rapid growth of flocculent particles. This also increases the density of the flocs, resulting in denser, larger particles with faster settling speeds. However, research and application of crystal nuclei from materials other than microsand are limited, making it difficult to break through the upper limit of sedimentation speed. Furthermore, the subtle combination of chemical agents and microsand has a significant impact on the treatment effect in the flocculation zone. Conventional agents used in the flocculation zone of high-density sedimentation tanks are relatively limited in variety, and their sedimentation effect cannot meet the effluent requirements for difficult-to-treat special wastewaters.

[0039] To solve the above technical problems, such as Figure 1 As shown in the figure, this application provides a water treatment method applied to a high-density sedimentation tank 1. The high-density sedimentation tank 1 includes a coagulation zone 2, a loading flocculation zone 3 and a sedimentation zone 4 connected in sequence. The coagulation zone 2 is connected to an inlet and the sedimentation zone 4 is connected to an outlet.

[0040] Water treatment methods include:

[0041] Wastewater enters coagulation zone 2 through the inlet. Coagulant is added to coagulation zone 2 and the wastewater is coagulated to form several fine flocs in coagulation zone 2.

[0042] After being treated in coagulation zone 2, the wastewater and fine flocs enter loading flocculation zone 3. Flocculant and loading material are added to loading flocculation zone 3 so that the wastewater and fine flocs, under the action of flocculant, use the loading material as crystal nuclei to generate flocs. The flocs adhere to the loading material to form larger flocs.

[0043] Flocculants include polyacrylamide and ammonium polyacrylate, and loadings include micro-sand, garnet and volcanic rock;

[0044] The flocculent material formed in the flocculation zone enters the sedimentation zone 4 for mud-water separation, and the separated water is discharged through the outlet.

[0045] In this embodiment, the water treatment method is applied in a high-density sedimentation tank 1, which includes at least a coagulation zone 2, a loading flocculation zone 3, and a sedimentation zone 4 connected in sequence. Wastewater first enters the coagulation zone 2, where the colloids in the wastewater are destabilized by the coagulant. Through complex processes such as double-layer compression, adsorption neutralization, adsorption bridging, and sediment trapping, many fine flocs are formed in the coagulation zone 2. Then, the wastewater enters the loading flocculation zone 3, where larger flocs are formed under the action of the loading material and flocculant. Finally, the wastewater enters the sedimentation zone 4 for sedimentation. The settled water is discharged through an outlet, while the settled sludge is discharged through a wastewater outlet or sent to the next treatment process.

[0046] For water treatment in coagulation zone 2, a coagulant is added to the wastewater in coagulation zone 2 to form several fine flocs. The coagulant can be a liquid PFS agent, with a dosage of 0.05-0.2 mL / L. For water treatment in loading flocculation zone 3, flocculants and loading materials are added to loading flocculation zone 3. The flocculant, as a polymeric chemical agent, is a mixture of polyacrylamide (PAM) and ammonium polyacrylate (PAA) in this embodiment. Ammonium polyacrylate (PAA) has a wider range of applications and can target more water qualities. Both polyacrylamide (PAM) and ammonium polyacrylate (PAA) are solid chemicals, which are mixed with water and stirred to a certain concentration to form a liquid agent. To facilitate the addition of flocculants, a flocculant dosing pipe 7 can be arranged in the flocculation zone.

[0047] In this embodiment, the loading material is a mixture of micro-sand, garnet, and volcanic rock, with the micro-sand being quartz sand. From the perspective of loading material characteristics, garnet and volcanic rock have a larger specific surface area than micro-sand, providing more adhesion and bonding sites for polymers and destabilized colloids. They act as flocculation nuclei and are more effective when loaded into the flocs. This allows the flocs to better adhere to their surface, forming larger flocs, thus facilitating sedimentation in sedimentation zone 4 and improving sedimentation efficiency and treatment effect.

[0048] Furthermore, considering the porosity of the loading materials, the porosity of micro-sand is 20%-40%, that of volcanic rock is 40%, and that of garnet is 50-55%. This demonstrates that garnet has the highest porosity; the larger porosity and specific surface area after adding garnet are more conducive to the formation of flocculent matter, further enhancing the treatment effect.

[0049] In addition, the hardness of the loading material is also a factor to consider. Excessive overall hardness of the loading material can easily cause wear and tear on equipment such as pumps, agitators, pipes, valves, and hydrocyclones 10, reducing their service life. Conversely, if the hardness is too low, the loading material particles are cut by the slurry pump, and when the particle size decreases to a certain level, the hydrocyclone 10 struggles to capture them, reducing the recovery effect. In this embodiment, the Mohs hardness of garnet and volcanic rock is lower than that of microsand. The microsand used in this embodiment has a hardness of 7, garnet a hardness of 6.5, and volcanic rock a hardness of 5. Adding garnet and volcanic rock reduces the average hardness of the loading material, placing it within a suitable range. Especially with the addition of an appropriate amount of volcanic rock, wear on equipment can be better reduced, extending its service life. Furthermore, the difficulty of capturing the loading material during recovery is reduced, improving the recovery effect and thus lowering water treatment costs.

[0050] Furthermore, since garnet and volcanic rock have a higher specific gravity than micro sand, their recovery rate is higher than that of micro sand, and they are not damaged too much by sludge, further reducing the cost of use.

[0051] Based on the above embodiments, to further improve the processing capacity of the load, the particle size of garnet in this embodiment is adjusted to be larger than that of micro-sand and volcanic rock. In one embodiment, the particle size of micro-sand is 100-150 μm, the particle size of garnet is 200-300 μm, and the particle size of volcanic rock is 100-150 μm. In this embodiment, the larger particle size of garnet, with its larger specific surface area, allows for better adhesion of flocculants, and the resulting flocculants can also settle better, further improving water treatment capacity.

[0052] The flocculent material formed in the flocculation zone enters the sedimentation zone 4 for mud-water separation, and the separated water is discharged through the outlet. In one embodiment of the sedimentation zone 4, inclined plates or inclined tubes are arranged above the sedimentation zone 4. The arrangement of the inclined plates or inclined tubes accelerates the sedimentation process of the flocculent material, reduces the sedimentation time, and improves the sedimentation efficiency.

[0053] The wastewater treatment process in loading flocculation zone 3 is roughly as follows: under the action of flocculant, wastewater forms flocs with the loading material as crystal nuclei, and the flocs adhere to the loading material to form larger flocs. Therefore, the flocculant and the loading material work synergistically, and the specific ratio of flocculant and the specific combination of loading materials will directly affect the wastewater treatment effect in loading flocculation zone 3.

[0054] Example 1:

[0055] The information for the pending hard removal projects is as follows:

[0056]

[0057] The specific parameters are as follows:

[0058]

[0059] In the above treatment environment, the loading material added to the ballast flocculation zone is only 100% micro sand, and the flocculant is 100% polyacrylamide (PAM). After treatment, the effluent turbidity is 11.3 NTU, the effluent hardness is 180 mg / L, the effluent COD is 320 mg / L, the effluent SS is 23 mg / L, and the sedimentation time in sedimentation zone 4 is 6 minutes.

[0060] Comparative Example 1:

[0061] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro sand, 20% garnet, and 20% volcanic rock, and the flocculant was 100% polyacrylamide (PAM). After treatment, the effluent turbidity was 8.5 NTU, the effluent hardness was 180 mg / L, the effluent COD was 290 mg / L, the effluent SS was 21 mg / L, and the sedimentation time in sedimentation zone 4 was 5 minutes.

[0062] Comparative Example 2:

[0063] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro-sand, 10% garnet, and 30% volcanic rock, and the flocculant was 100% polyacrylamide (PAM). After treatment, the effluent turbidity was 8.9 NTU, the effluent hardness was 180 mg / L, the effluent COD was 300 mg / L, the effluent SS was 22 mg / L, and the sedimentation time in sedimentation zone 4 was 6 minutes.

[0064] Comparative Example 3:

[0065] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro sand, 30% garnet, and 10% volcanic rock, and the flocculant was 100% polyacrylamide (PAM). After treatment, the effluent turbidity was 6.5 NTU, the effluent hardness was 140 mg / L, the effluent COD was 280 mg / L, the effluent SS was 14 mg / L, and the sedimentation time in sedimentation zone 4 was 4 minutes.

[0066] Comparative Example 4:

[0067] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro sand, 30% garnet, and 10% volcanic rock, and the flocculants were 70% polyacrylamide (PAM) and 30% ammonium polyacrylate (PAA). After treatment, the effluent turbidity was 6.4 NTU, the effluent hardness was 140 mg / L, the effluent COD was 280 mg / L, the effluent SS was 14 mg / L, and the sedimentation time in sedimentation zone 4 was 4 minutes.

[0068] Comparative Example 5:

[0069] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro sand, 30% garnet, and 10% volcanic rock, and the flocculants were 80% polyacrylamide (PAM) and 20% ammonium polyacrylate (PAA). After treatment, the effluent turbidity was 4.2 NTU, the effluent hardness was 140 mg / L, the effluent COD was 270 mg / L, the effluent SS was 11 mg / L, and the sedimentation time in sedimentation zone 4 was 3 minutes.

[0070] Comparative Example 6:

[0071] Based on Example 1, the loading materials added to the ballast flocculation zone were 60% micro sand, 30% garnet, and 10% volcanic rock, and the flocculants were 90% polyacrylamide (PAM) and 10% ammonium polyacrylate (PAA). After treatment, the effluent turbidity was 5.6 NTU, the effluent hardness was 120 mg / L, the effluent COD was 280 mg / L, the effluent SS was 13 mg / L, and the sedimentation time in sedimentation zone 4 was 4 minutes.

[0072]

[0073] The results of the above embodiments and comparative examples are shown in the table above. Analysis shows that, firstly, based on the analysis of Examples 1, 1, 2, and 3, under the treatment environment where the flocculant was 100% polyacrylamide (PAM), the addition of garnet and volcanic rock to the loading significantly reduced effluent turbidity, hardness, suspended solids (SS), and COD. Appropriately increasing the proportion of garnet and decreasing the proportion of volcanic rock resulted in even more significant reductions in effluent turbidity, hardness, SS, and COD, while further shortening the settling time. This demonstrates that the specific surface area, specific gravity, and porosity of garnet play a significant role in wastewater treatment in the flocculation zone, improving water treatment efficiency. Secondly, based on the analysis of Comparative Examples 4 to 6, with the loading preferably consisting of 60% micro-sand, 30% garnet, and 10% volcanic rock, the flocculant ratio was adjusted, and ammonium polyacrylate (PAA) was added as part of the flocculant. Experimental data show that the effluent turbidity further decreased after the addition of ammonium polyacrylate (PAA). After adjusting the ratio of PAA to effluent, as shown in Comparative Example 5, the effluent turbidity, SS, COD, and sedimentation time all reached their lowest values, and the effluent hardness was also low. Therefore, based on the final treatment results, considering the wider applicability of the flocculant and the lower effluent turbidity, this application preferably uses the ratio of Comparative Example 5 as the ratio of the loading material to the flocculant.

[0074] Furthermore, the dosage of the coagulant is 0.05-0.2 mL / L, preferably 0.1 mL / L, the dosage of the loading material is 3-5 mg / L, the concentration of the flocculant is 0.05-0.2%, preferably 0.1%, and the dosage of the flocculant is 1-3 mg / L, preferably 2 mg / L.

[0075] In one embodiment of the high-density sedimentation tank 1, such as Figures 1 to 3 As shown, the high-density sedimentation tank 1 includes a coagulation zone 2, a loading flocculation zone 3 and a sedimentation zone 4 connected in sequence, wherein the coagulation zone 2 is connected to an inlet and the sedimentation zone 4 is connected to an outlet.

[0076] The sedimentation zone 4 includes an inclined plate separation zone 13, and the outlet corresponds to the inclined plate separation zone 13. The inclined plate separation zone 13 includes expansion bolts 21, a support net 11, and an inclined plate module 12.

[0077] Multiple expansion bolts 21 are provided and fixed on the four sides of the inclined plate separation area 13. The support net 11 includes cross-shaped support rods 110. The two ends of the support rods 110 are fixedly connected to the corresponding expansion bolts 21 through connectors. Multiple inclined plate modules 12 are provided and stacked on the support net 11 in the horizontal direction. The connected inclined plate modules 12 are fixedly connected to each other.

[0078] In the longitudinal direction, adjacent inclined plate modules 12 are fixedly connected.

[0079] In this embodiment, the inclined plate separation zone 13 is part of the sedimentation zone 4 and is located above the sedimentation zone 4. Large flocs formed in the flocculation zone enter the sedimentation zone 4 through the water passage and undergo mud-water separation under the action of the inclined plate separation zone 13. Figure 3 As shown, the inclined plate separation zone 13 mainly includes a support net 11 and multiple inclined plate modules 12 arranged on the support net 11. The inclined plate module 12 is composed of multiple parallel inclined plates. Adjacent inclined plates maintain a distance in the longitudinal direction and are fixedly connected in the transverse direction by connecting plates to form multiple channels. After the flocculent enters the channel, it settles. The settled sludge accumulates in the lower part of the sedimentation zone 4, and the settled water is discharged through the outlet.

[0080] The support mesh 11, serving as a structure supporting the inclined plate module 12, needs to be fixedly connected to the side wall of the inclined plate separation area 13. To facilitate the fixing of the support mesh 11, taking a square inclined plate separation area 13 as an example, as follows... Figure 2 As shown, in this embodiment, multiple expansion bolts 21 are arranged on the surrounding sidewalls of the inclined plate separation area 13, with one end of each expansion bolt 21 extending out of the sidewall as a base for connection with the support net 11. The support net 11 includes multiple crisscrossing support rods 110. The arrangement density of the support rods 110 can be designed according to actual needs, and this embodiment does not impose any restrictions on it.

[0081] In the longitudinal direction, the end of the support rod 110 is fixedly connected to the corresponding expansion bolt 21 via a connector. Similarly, in the transverse direction, the end of the support rod 110 is also fixedly connected to the corresponding expansion bolt 21 via a connector. The connector, serving as the structure connecting the expansion bolt 21 and the support rod 110, can have various structural forms. In one embodiment, the connector is a clamp, which clamps and locks onto the expansion bolt 21 and the support rod 110, thereby fixing the support rod 110 and the expansion bolt 21. The support rod 110 can be made of round steel, and the intersecting support rods 110 can be directly welded together.

[0082] In this embodiment, expansion bolts 21 are arranged on the side wall of the inclined plate separation zone 13 as the installation base for the support net 11. Compared with the related technology, which involves pouring multiple concrete columns above the sedimentation zone 4, fixing crossbeams on the concrete columns, and then fixing longitudinal beams on the crossbeams, the arrangement cost is lower, the arrangement time is shorter, and the space occupied by the sedimentation zone 4 can be reduced.

[0083] Since multiple inclined plate modules 12 need to be arranged on the support net 11, in order to avoid displacement between adjacent inclined plate modules 12 in the longitudinal direction, which would affect the sedimentation effect, in this embodiment, adjacent inclined plate modules 12 are fixedly connected in the longitudinal direction. The specific fixing method can be to use an electric soldering iron to glue adjacent inclined plate modules 12 into a whole, or to use clips to clip adjacent inclined plate modules 12 together.

[0084] Since the inclined plate module 12 is only placed on the support net 11, it may float upwards due to the buoyancy of the water during the water treatment process, thus affecting the sedimentation effect. Therefore, to avoid this problem, such as... Figure 3 As shown, in this embodiment, the support net 11 is provided with hooks 22 corresponding to the inclined plate module 12, and at least one plate in the inclined plate module 12 is provided with a connection hole that is connected to the hooks 22.

[0085] Specifically, it should be noted that the hook 22 can be selectively installed on either the horizontal or vertical support rods 110 in the support net 11. The hook 22 is fixedly connected to the support rod 110, with its upper end positioned above the support rod 110. A corresponding connection hole is provided on one of the inclined plates of the inclined plate module 12. After the inclined plate module 12 is installed, the hook 22 engages with the connection hole, thus fixing the inclined plate module 12 to the support net 11 and preventing it from floating. Furthermore, to facilitate the connection between the inclined plate module 12 and the hook 22, based on the left-to-right installation arrangement of the inclined plate module 12, the hook 22 is located on the right side of the inclined plate module 12, and a connection hole needs to be provided on the right side plate of the inclined plate module 12 accordingly. For one inclined plate module 12, one or more hooks 22 can be used.

[0086] In one embodiment, since the inclined plate modules 12 at both ends are arranged to abut against the sidewalls of the inclined plate separation area 13, and the inclined plate modules need to be replaced after prolonged use, to facilitate the replacement of the inclined plate modules 12, when the hook 22 has a hooking part 220, the inclined plate module 12 abutting against the sidewall in the direction of the hooking part 220 may not be connected to the hook 22. Specifically, as shown... Figure 3 As shown, taking the arrangement of the inclined plate modules 12 from left to right as an example, the first inclined plate module 12 abuts against the side wall but is not connected to the hook 22. The second inclined plate module 12 abuts against the first inclined plate module 12, and its right side is connected to the hook 22. The third inclined plate module 12 abuts against the second inclined plate module 12, and its right side is connected to the hook 22. The inclined plate modules 12 are arranged in this way. Since the right side of the last inclined plate module 12 also abuts against the side wall, it can be considered not to connect to the hook 22 on the right side. Of course, it can also be chosen to connect to the hook 22. This embodiment does not impose any restrictions on this.

[0087] During disassembly, after pulling the first inclined plate module 12 upward, the second inclined plate module 12 can be disassembled by moving it to the left and detaching it from the hook 22. The same applies to subsequent inclined plate modules 12.

[0088] In another implementation, such as Figure 4 As shown, the hook 22 may include two hook parts 220 distributed on the left and right. The hook part 220 on the left can be connected to the left inclined plate module 12, and the hook part 220 on the right can be connected to the right inclined plate module 12, thereby connecting the inclined plate modules 12 into two wholes in the horizontal direction. After cooperating with the adhesive connection between adjacent inclined plate modules 12 in the vertical direction, the inclined plate modules 12 in both the horizontal and vertical directions are connected into a whole, which can prevent floating and avoid misalignment between adjacent inclined plate modules 12.

[0089] like Figure 4 As shown, in this embodiment, for ease of disassembly, the left side of the first inclined plate module 12 abuts against the side wall, while the right side is not connected to the hook 22. The left side of the second inclined plate module 12 abuts against the first inclined plate module 12, while the right side is connected to the hook 22. The third inclined plate module 12 is connected to the hook 22 on both sides, and so on. The right side of the last inclined plate module 12 may only abut against the side wall and not be connected to the hook 22, meaning the last hook 22 has a hook portion 220 on only one side. During disassembly, first pull the first inclined plate module 12 upwards, then pull the second inclined plate module 12 to the left until it disengages from the corresponding hook portion 220, at which point it can be disassembled. When disassembling the third inclined plate module 12, since both sides are connected to the corresponding hook portions 220, its left side can be disengaged from the corresponding hook portion 220 before being pulled to the left. Specifically, this disengagement can be achieved by pressing the corresponding connecting plate in the inclined plate module 12 to deform it.

[0090] To facilitate the connection between the hook 22 and the support rod 110, the hook 22 can be made of plastic and has a C-shaped opening at the lower end. The elastic deformation of the C-shaped opening can snap the hook 22 onto the support rod 110.

[0091] To facilitate the recycling of the load, such as Figure 1 As shown, the high-density sedimentation tank 1 in this embodiment also includes a hydrocyclone 10. The inlet end of the hydrocyclone 10 is connected to the sludge discharge port 14 of the sedimentation zone 4. The hydrocyclone 10 includes an overflow port and a bottom flow port. The bottom flow port is connected to one of the loading material inlet ports on the loading flocculation zone 3. The overflow port is connected to a sewage pipe.

[0092] After separation in sedimentation zone 4, the sludge enters hydrocyclone 10. After being processed by hydrocyclone 10, part of the load enters loading flocculation zone 3 through the underflow port.

[0093] Specifically, it should be noted that the inlet of the hydrocyclone 10 can be connected to the sludge discharge port 14 of the sedimentation zone 4 via a sludge return pump, and the settled sludge is sent into the hydrocyclone 10 via the sludge return pump. Under the action of the hydrocyclone 10, most of the loading materials (i.e., micro-sand, garnet, and volcanic rock) in the sludge are separated, and the separated loading materials are then fed into the loading flocculation zone 3 for water treatment. The separated sludge is discharged through the sewage pipe.

[0094] To improve the coagulation effect in coagulation zone 2, a first stirring device 5 is provided in coagulation zone 2 in this embodiment. To improve the treatment effect in loading flocculation zone 3, a guide tube 17 is provided in loading flocculation zone 3 in this embodiment. To facilitate the discharge of sludge in sedimentation zone 4, a sludge scraping device 15 is provided in sedimentation zone 4 in this embodiment, and the scraping part of the sludge scraping device 15 is located below the inclined plate separation zone 13.

[0095] The lower end of the coagulation zone 2 is connected to the lower end of the loading flocculation zone 3 via the inlet pipe 16. The outlet of the inlet pipe 16 is connected to the lower end of the guide tube 17. The guide tube 17 maintains a distance from the loading coagulation zone 2. The wastewater entering the loading flocculation zone 3 can circulate under the action of the guide tube 17, thereby increasing the contact time between impurities, flocculants, and loading materials, and improving the treatment effect. Based on this, to further improve the treatment effect, a second stirring device 18 is provided inside the guide tube 17 in this embodiment.

[0096] To facilitate the dosing of the reagents, in one embodiment, the high-density sedimentation tank 1 further includes a coagulant dosing pipe 6, a loading material dosing pipe 8, a flocculant dosing pipe 7, and a loading material circulation pipe 9; wherein, the coagulant dosing pipe 6 is connected to the coagulation zone 2, the loading material dosing pipe 8 is connected to the loading flocculation zone 3, the flocculant dosing pipe 7 enters the loading flocculation zone 3 and extends into the guide tube 17, and a flocculant dosing ring 19 is provided at one end of the flocculant dosing pipe 7 extending into the guide tube 17; the loading material circulation pipe 9 is connected to the underflow port of the hydrocyclone 10.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water treatment method applied to a high-density sedimentation tank, characterized in that, include: The high-density sedimentation tank includes a coagulation zone, a loading flocculation zone, and a sedimentation zone connected in sequence, wherein the coagulation zone is connected to an inlet and the sedimentation zone is connected to an outlet. The water treatment method includes: Wastewater enters the coagulation zone through the inlet, and coagulant is added to the coagulation zone to coagulate the wastewater, so that several fine flocs are formed in the coagulation zone. Wastewater and fine flocs treated in the coagulation zone enter the loading flocculation zone. Flocculant and loading material are added to the loading flocculation zone so that the wastewater and fine flocs, under the action of the flocculant, generate flocs with the loading material as crystal nuclei. The flocs adhere to the loading material to form larger flocs. The flocculant includes polyacrylamide and ammonium polyacrylate, and the loading includes micro sand, garnet and volcanic rock; The micro-sand has a particle size of 100-150 μm, the garnet has a particle size of 200-300 μm, and the volcanic rock has a particle size of 100-150 μm; the ratio of the micro-sand, the garnet, and the volcanic rock is 6:3:1; and the ratio of the polyacrylamide and ammonium polyacrylate is 8:

2. The flocculent material formed in the flocculation zone enters the sedimentation zone for mud-water separation, and the separated water is discharged through the outlet.

2. The water treatment method according to claim 1, characterized in that, The dosage of the coagulant is 0.05-0.2 mL / L, the dosage of the loading material is 3-5 mg / L, the concentration of the flocculant is 0.05-0.2%, and the dosage of the flocculant is 1-3 mg / L.

3. The water treatment method according to claim 1, characterized in that, The high-density sedimentation tank also includes a hydrocyclone. The inlet end of the hydrocyclone is connected to the sludge discharge port of the sedimentation zone. The hydrocyclone includes an overflow port and a bottom flow port. The bottom flow port is connected to one of the loading material inlets on the loading flocculation zone. The overflow port is connected to a sewage pipe. The sludge separated in the sedimentation zone enters the hydrocyclone. After being processed by the hydrocyclone, part of the load enters the loading flocculation zone through the underflow outlet.

4. The water treatment method according to claim 1, characterized in that, The sedimentation zone includes an inclined plate separation zone, and the outlet corresponds to the inclined plate separation zone. The inclined plate separation zone includes expansion bolts, a support mesh, and an inclined plate module. The expansion bolts are arranged in multiples and fixed on the four side walls of the inclined plate separation area. The support net includes crisscrossing support rods. The two ends of the support rods are fixedly connected to the corresponding expansion bolts through connectors. The inclined plate modules are arranged in multiples and stacked on the support net in the horizontal direction. In the vertical direction, adjacent inclined plate modules are fixedly connected.

5. The water treatment method according to claim 4, characterized in that, The support network is provided with hooks corresponding to the inclined plate module, and at least one plate in the inclined plate module is provided with a connection hole for hooking with the hook.

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