Feed water treatment process of diatom-containing water source

Abstract

The invention belongs to the technical field of water treatment, and particularly discloses a water supply treatment process of a diatom-containing water source, which comprises the following steps: S1, carrying out pre-oxidation treatment on raw water to generate small fragments of floc; s2, adding a flocculating agent into the raw water subjected to pre-oxidation treatment, and carrying out directional flocculation; s3, carrying out solid-liquid separation treatment on the directionally flocculated raw water in a floating and settling tank; and S4, filtering the raw water treated by the floating and settling tank through a filter tank, adding a disinfectant, and introducing the treated raw water into a clean water tank. A plurality of inclined plates synchronously rotate under the driving of a square and round rod through the movement of a movable frame, when air flotation is operated, the inclined plates at the front section of rotation are in a vertical state, combination of bubbles and flocs is enhanced through a narrow space blocked by the inclined plates, the flocs in the narrow space are combined with the bubbles to move upwards, and the air flotation effect of the flocs is guaranteed; during operation and precipitation, the inclined plate can be adjusted to a proper angle according to the quality of raw water so as to enhance the precipitation effect and solve the problem of inclined plate blockage.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a water treatment process for a diatom-containing water source. Background Art

[0002] Among the water sources of many rivers, lakes and reservoirs, especially some reservoirs, algae pollution is a common problem. And the water quality of the water source changes significantly with the seasons. In summer, it is rainy and the turbidity is high, while in winter, the temperature is low and the turbidity is low, which brings great trouble to the treatment of drinking water. The sedimentation process commonly used at present has poor treatment effect when the turbidity is low in winter, and the water quality of the water supply is difficult to meet the standards. There is also the problem that algae are easy to clog the filter tank, resulting in a significant decrease in water production; on the other hand, although the flotation process can well treat the water source water that is difficult to treat by the above-mentioned sedimentation process, the turbidity caused by the rainy season increases, and the treatment effect of the flotation process becomes worse, and sometimes it cannot even be treated. It can be seen that a single sedimentation or flotation process is difficult to deal with the above-mentioned water source water.

[0003] Therefore, it is necessary to invent a water treatment process containing diatom water to solve the above problems. Summary of the invention

[0004] In view of the above problems, the present invention provides a water treatment process for a diatom-containing water source to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A water treatment process for a diatom-containing water source comprises the following steps: S1. Pre-oxidation treatment is performed on the raw water, and the diatoms in the raw water are broken into small fragments that are easy to form flocs by pre-oxidation means; S2, adding a flocculant to the raw water after pre-oxidation treatment to directional flocculate the small diatom fragments; S3, the raw water after directional flocculation is treated by solid-liquid separation in a flotation tank; S4. The raw water treated in the flotation tank is filtered through the filter tank, and disinfectant is added to the raw water. Finally, the raw water after disinfection is passed into the clean water tank.

[0006] Furthermore, a flocculation tank is provided on one side of the flotation and settling tank, the output end of the water inlet pipe is connected with the flocculation tank, the raw water is introduced into the flocculation tank through the water inlet pipe, a plurality of mud discharge pipes are provided on the bottom side of the flocculation tank, a through-wall hole is provided on the bottom of one side of the flocculation tank, the raw water after flocculation enters the air flotation contact zone through the through-wall hole, a dissolved air releaser is provided inside the air flotation contact zone, the dissolved air releaser performs aeration treatment on the raw water passing through the through-wall hole, a retaining wall is provided on one side of the bottom of the air flotation contact zone away from the side, a sedimentation and sludge accumulation zone is provided on one side of the retaining wall, a flotation water collecting pipe is provided on the top of the inner side of the sedimentation and sludge accumulation zone, a mud scraper is provided on the inner side of the sedimentation and sludge accumulation zone, and a plurality of floating and sinking separation devices are provided on the top of the sedimentation and sludge accumulation zone. The floating and sinking separation device is in a floating and sinking pool, and an air flotation scum collecting device is arranged on one side of the floating and sinking separation device. One side of the floating and sinking separation device is connected to the sedimentation water overflow weir through a wall hole, and a sedimentation water outlet area and an air flotation water outlet area are arranged on one side of the sedimentation water overflow weir. A sedimentation water outlet pipe is arranged at the bottom of the sedimentation water outlet area, and an air flotation water outlet pipe is arranged at the bottom of the air flotation water outlet area. The end of the air flotation water collecting pipe is connected with the bottom of the air flotation water outlet area, and a dissolved air water pipe is arranged on the top of the floating and sinking separation device. The output end of the dissolved air water pipe is connected with the input end of the dissolved air releaser, and an air flotation scraper is arranged on the top of the floating and sinking separation device. A sedimentation mud discharge pipe is arranged on one side of the sedimentation mud accumulation area, and a scum discharge pipe is arranged on one side of the air flotation scum collecting device.

[0007] Furthermore, the input end of the dissolved air water pipe is connected to a flocculation tank, and the flocculation tank is configured as a grid flocculation tank, and a grid filler is provided in the flocculation tank.

[0008] Furthermore, the multiple floating and sinking separation devices inside the floating and sinking tank are distributed in three zones according to the water flow direction. The floating and sinking separation devices include multiple inclined plates. The inclined plate spacing in the first zone is set to 80-120mm, the inclined plate spacing in the second zone is 50-80mm, and the inclined plate spacing in the third zone is 50mm. The first zone is close to the dissolved air releaser, the third zone is close to the floating slag collection device, and the second zone is between the first zone and the second zone.

[0009] Furthermore, the floating and sinking separation device also includes two opposite side frames, a plurality of inclined plates arranged in parallel are provided between the two side frames, and the two side frames are fixedly connected by a plurality of bottom rods, the plurality of inclined plates correspond one to one with the plurality of bottom rods, a card frame is provided on the top of the bottom rod, an insertion strip is fixed to the bottom end of the inclined plate, and the inclined plate is correspondingly plugged into the inside of the card frame by the insertion strip, a ring is fixed to the bottom end of the card frame, the ring is rotatably sleeved on the surface of the bottom rod, and the end of the ring is connected to the inner side of the side frame by a torsion spring, and an inclined strip for limiting the card frame is provided on one side of the bottom rod.

[0010] Furthermore, a slide groove is provided on the top of the side frame, and multiple slide frames are provided inside the slide groove. Two adjacent slide frames are fixedly connected by connecting plates. The multiple slide frames and the multiple connecting plates are assembled to form a mobile frame. A square and round rod is inserted through the center of the slide frame. The multiple slide frames correspond to the multiple inclined plates one by one. Side grooves corresponding to the square and round rods are provided on the sides of the inclined plates. The inner ends of the square and round rods are inserted into the side grooves. A circular frame is provided on the outer end of the slide frame, and the outer diameter of the circular frame is greater than the height of the slide groove. The inner side surface of the circular frame fits with the outer side surface of the side frame. A rotating sleeve is provided on the outer side of the slide frame. The rotating sleeve is spirally sleeved on the surface of the square and round rods. A clamping strip that limits the rotating sleeve is fixed on the outer end surface of the slide frame.

[0011] Furthermore, a limiting plate is provided on the top of the sliding frame at the inner end of the sliding groove, the limiting plate is fixedly connected to the inner end of the sliding frame, the limiting plate cooperates with the circular frame to limit the sliding frame, a convex rod is fixed on the side of the limiting plate, and an annular groove is provided on the surface of the convex rod.

[0012] Furthermore, a baffle is provided on the top of the side frame, the baffle is away from the inner end of the slide groove, a sleeve is inserted at the center of the baffle, the center line of the protruding rod coincides with the center line of the sleeve, two side plates are fixed to the end of the sleeve, an insertion rod penetrating the side plate is fixed to the side of the baffle, a spring is sleeved on the surface of the insertion rod, one end of the spring is connected to the side plate, and the other end of the spring is connected to the outer end of the insertion rod, two opposite clamping frames are provided at the bottom of the side plate, a clamping rod penetrating the sleeve is fixed to the inner side of the clamping frame, and the inner end of the clamping rod corresponds to the annular groove on the surface of the protruding rod, a limiting rod is provided between the two clamping frames, the clamping frame is sleeved on the surface of the limiting rod, and the two clamping frames are connected by spring sheets.

[0013] Technical effects and advantages of the present invention: 1. The present invention causes multiple inclined plates to rotate synchronously by moving the moving frame and then driven by the square and round rods. When the flotation is running, the inclined plates in the front section of the rotation are in a vertical state. The narrow space blocked by the inclined plates can enhance the combination of bubbles and flocs. The flocs in the narrow space move upward with the bubbles to ensure the flotation effect of the flocs.

[0014] 2. In the present invention, when sedimentation is in operation, all inclined plates are adjusted to an inclined state to accelerate the sedimentation of particles. When the sludge between the inclined plates increases, the movable frame uses square and round rods to make multiple inclined plates in a vertical state. At this time, the flocs accumulated on the surface of the inclined plates gradually slide down on the surface of the inclined plates, and the slid down flocs accumulate in the sedimentation sludge area, which can quickly clean the flocs on the surface of the inclined plates. After the sludge sliding is completed, the inclined plates can continue to be moved to the reverse angle state to operate sedimentation. By rotating the inclined plates regularly, when some inclined plates are in a vertical state during the process, the sludge accumulated on the inclined plates can slide to the bottom of the floating sedimentation tank, ensuring that the inclined plates will not be blocked by sludge accumulation.

[0015] 3. The present invention uses a moving frame to tilt the inclined plate by using a square rod. After the inclined plate reaches a suitable angle, the rotating sleeve is twisted. The spiral effect of the rotating sleeve and the square rod makes the inner end of the square rod fit tightly with the inner wall of the side groove. The inclined plate uses the reaction force of the square rod on the moving frame to make the limiting plate fit tightly with the inner side of the side frame. The static friction between the limiting plate and the side frame is used to conveniently limit the moving frame. When the sedimentation is running, the inclined plate can be adjusted to a suitable angle according to the quality of the raw water to enhance the sedimentation effect.

[0016] 4. The present invention enables the card frame to fit on the surface of the inclined bar through the inclined inclined plate. The supporting effect of the inclined bar on the card frame enables the card frame and the inclined plate to be inclined. The twisting force of the torsion spring cooperates with the inclined bar to limit the card frame, preventing the card frame from exerting excessive pressure on the inclined bar, thereby avoiding deformation and damage of the inclined bar under excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a process flow chart of water treatment of a diatom-containing water source according to an embodiment of the present invention; Figure 2 1 is a schematic diagram of the overall cross-section of a floating and sinking tank according to an embodiment of the present invention; Figure 3 This is a schematic plan view of a floating and sinking tank according to an embodiment of the present invention; Figure 4 is a cross-sectional schematic diagram of a flocculation tank according to an embodiment of the present invention; Figure 5 is a schematic plan view of a flocculation tank according to an embodiment of the present invention; Figure 6 Schematic diagram of regional distribution of the floating and sinking pools according to an embodiment of the present invention; Figure 7 is an overall schematic diagram of a float-sink separation device according to an embodiment of the present invention; Figure 8 is a schematic diagram of two side frames of an embodiment of the present invention being connected by using a plurality of bottom bars; Fig. 9 Schematic diagram of an inclined plate in an embodiment of the present invention plugging into a card frame using an insert strip; Fig.10 The embodiment of the present invention Figure 8 A magnified view of the structure of part A; Fig.11 is a partial structural schematic diagram of a mobile rack according to an embodiment of the present invention; Fig.12 is a schematic diagram of a baffle according to an embodiment of the present invention; In the figure: 1. water inlet pipe; 2. flocculation tank; 3. mud discharge pipe; 4. wall hole; 5. air flotation contact area; 6. dissolved air releaser; 7. retaining wall; 8. sedimentation and sludge accumulation area; 9. air flotation water collection pipe; 10. mud scraper; 11. floating and sinking separation device; 12. air flotation slag collection device; 13. sedimentation water overflow weir; 14. sedimentation water area; 15. air flotation water area; 16. sedimentation water pipe; 17. air flotation water pipe; 18. dissolved air water pipe; 19. air flotation slag scraper; 20. sedimentation mud discharge pipe; 21. slag discharge pipe ; 22. Grid filler; 23. Inclined plate; 24. Side frame; 25. Bottom rod; 26. Card frame; 27. Insertion strip; 28. Ring; 29. ​​Torsion spring; 30. Inclined strip; 31. Slide groove; 32. Slide frame; 33. Connecting plate; 34. Square and round rod; 35. Side groove; 36. Rotating sleeve; 37. Card strip; 38. Limiting plate; 39. Protruding rod; 40. Ring groove; 41. Baffle; 42. Sleeve; 43. Side piece; 44. Insertion rod; 45. Spring; 46. Card frame; 47. Card rod; 48. Limiting rod; 49. Shrapnel. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0019] The present invention provides a water treatment process containing diatom water source, such as Figure 1 As shown, the following steps are included: S1. Pre-oxidation treatment is performed on the raw water, and the diatoms in the raw water are broken into small fragments that are easy to form flocs by pre-oxidation means.

[0020] Exemplarily, the pre-oxidation treatment needs to select an appropriate pre-oxidation method based on the turbidity of the diatom raw water, which refers to the active oxidative species produced by the UV / sodium hypochlorite or UV / potassium permanganate method to improve the flocculation microenvironment, reduce the colloidal steric hindrance, and change the electronegativity of the diatom surface. Breaking the diatoms into pieces mainly changes the electrical properties of the diatom surface and improves the flocculation efficiency. At the same time, the oxidizing property of the agent is used to destroy the cell wall of the algae, even if the algal cells are broken and their shape is changed from a hard needle rod shape to several small fragments. The appropriate pre-oxidation intensity can be adapted according to the algae concentration in the diatom raw water. In addition, no algal toxins will be released when the algal cells are destroyed. After long-term pilot and field test verification, no algal toxins were detected in the water after the pre-oxidation process was applied, so there is no need to consider the risk of increased algal toxins.

[0021] Among them, when the ultraviolet transmittance of diatom raw water is less than 90% by changing the surface electronegativity of diatoms, potassium permanganate and sodium hypochlorite can be used for pre-oxidation. When the ultraviolet transmittance of diatom raw water is greater than 90%, ultraviolet and sodium hypochlorite can be used for pre-oxidation. When using this method, the electronegativity of diatom raw water should be reduced from -30 to the range of 0 to -5 to reduce electrostatic repulsion and improve flocculation efficiency.

[0022] In pre-oxidation treatment: the dosage of potassium permanganate ranges from 0.4 to 2 mg / L, and a reaction time of 40 minutes is ensured, and chlorine is added before flocculation. UV / sodium hypochlorite is added simultaneously, and the UV dosage is between 40 and 200 mJ / cm2. The dosage of sodium hypochlorite in both combined processes is between 0.2 and 2 mg / L.

[0023] S2. Add flocculant to the raw water after pre-oxidation treatment to carry out directionally flocculating the small fragments of diatoms.

[0024] For example, directional flocculation is based on the pre-oxidation effect, and the flocculation residence time and flocculation velocity gradient are reconfigured. The specific approach includes strengthening the collision at the front end, increasing the floc crushing in the middle and rear stages, and using secondary dosing and extending the residence time in the rear stage. This ensures that the floc particle size distribution at the flocculation end point shows a trend of polarization, so as to give full play to the advantages of the floating and settling tank process and achieve better solid-liquid separation effect.

[0025] exist Figure 4 and Figure 5 In the front stage of flocculation, due to the low turbidity of diatom raw water, the distribution of colloids and particles in the water quality is sparser than that of ordinary river water. Therefore, the filler setting in the front stage of flocculation should enlarge the velocity gradient G by 30% on the basis of the conventional process to increase the collision probability of particles. The input end of the dissolved air water pipe 18 is connected to the flocculation tank 2, and the flocculation tank 2 is set as a cyclone grid flocculation tank, and a grid filler 22 is provided in the flocculation tank 2. The local turbulent state is changed by the cyclone grid flocculation tank, and the number of collisions between the flocculant and the pollutant is increased, thereby ensuring the adsorption effect of the flocculant on the pollutant and strengthening the micro-flocculation effect.

[0026] In the middle and later stages of flocculation, the velocity gradient can be increased locally according to the floc conditions. According to the floc growth conditions, the G value is between 50-150s. -1 The flocs are broken between the two stages. For raw water with a turbidity of less than 5 NTU, no more than 60% of the initial addition of flocculants can be added after breaking to enhance the reflocculation effect. Among them, due to the presence of algae, long-chain, loose flocs are often formed at this time. Appropriate force is applied to the flocs to break them at the weak points where the chemical bonds are weaker. Although the flocs grown by reflocculation in the later stage are smaller in size than before breaking, their porosity is increased, that is, the density of the flocs is improved, which is more conducive to sedimentation.

[0027] When conducting directional flocculation, extend the residence time of the latter stage of flocculation, especially the reflocculation time after crushing, and keep it at a G value of 35s. -1 Below, at least 10 minutes of residence time is guaranteed to ensure good growth of the flocs, so that the debris in the water can be captured as much as possible by the sweeping action of the mesh of the large flocs.

[0028] Among them, the floc fragments in the water after crushing are basically small flocs with high density. The larger flocs have a greater chance of colliding into larger flocs during the flocculation process, while the small flocs have an unsatisfactory re-flocculation effect due to the reduction in the number of flocs in the water. In order to reduce this possibility, it is necessary to extend the re-flocculation time after crushing to increase the collision probability. Because of the above-mentioned crushing and re-flocculation process, the floc size distribution at the flocculation end point shows a polarized distribution law as a whole.

[0029] S3. The raw water after directional flocculation is treated with solid-liquid separation in a flotation tank.

[0030] exist Figures 2 to 5 In the embodiment, a flocculation tank 2 is arranged on one side of the flotation tank, the output end of the water inlet pipe 1 is connected with the flocculation tank 2, the raw water is introduced into the flocculation tank 2 through the water inlet pipe 1, a plurality of mud discharge pipes 3 are arranged on the bottom side of the flocculation tank 2, a through-wall hole 4 is arranged on the bottom of one side of the flocculation tank 2, the raw water after flocculation enters the flotation contact area 5 through the through-wall hole 4, a dissolved air releaser 6 is arranged inside the flotation contact area 5, and the dissolved air releaser 6 performs aeration treatment on the raw water passing through the through-wall hole 4. The dissolved air releaser 6 is arranged as a micro-nano aeration device, so that the size of the bubbles entering the water is similar to the size of the small flocs entering the water by air flotation, so as to increase the flotation removal efficiency of the small flocs.

[0031] The formation of micro-nano bubbles is achieved by using the method of reflux pressurization combined with a microporous ceramic membrane to control the size of the bubbles. Specifically, after the reflux water is fully pressurized, it is connected to the microporous ceramic membrane aeration head by a pipe system. When the pressurized dissolved air passes through the ceramic membrane, the bubbles in the water are fully cut by the ceramic membrane to form micro-nano bubbles, and the ceramic membrane is specially made. Compared with traditional large bubbles, micro-nano bubbles rise more slowly in the water, which allows them to stay in the water longer, thereby extending the contact time between oxygen and water and forming an efficient coupling effect with the floating and sinking tank.

[0032] A micro-nano bubble aeration device is used to focus on combining bubbles with smaller flocs, while larger flocs with better settling performance are removed using a flotation separation device 11 arranged in the flotation separation tank, thereby improving the treatment efficiency of the flotation separation tank.

[0033] A retaining wall 7 is arranged at one side away from the bottom of the air flotation contact area 5, a sedimentation and sludge accumulation area 8 is arranged at one side of the retaining wall 7, an air flotation water collecting pipe 9 is arranged at the top of the inner side of the sedimentation and sludge accumulation area 8, a mud scraper 10 is arranged at the inner side of the sedimentation and sludge accumulation area 8, a plurality of floating and sinking separation devices 11 are arranged at the top of the sedimentation and sludge accumulation area 8, the floating and sinking separation devices 11 are in the floating and sinking pool, an air flotation slag collecting device 12 is arranged at one side of the floating and sinking separation device 11, one side of the floating and sinking separation device 11 is connected to the sedimentation water overflow weir 13 through the through-wall flower hole 4, a sedimentation water overflow weir 13 is arranged at one side of the sedimentation water overflow weir 13, and a sedimentation water overflow area 14 and an air flotation water overflow area 15 are arranged. A sedimentation outlet pipe 16 is provided at the bottom of the water outlet area 14, a flotation outlet pipe 17 is provided at the bottom of the flotation outlet area 15, the end of the flotation water collecting pipe 9 is connected with the bottom of the flotation outlet area 15, a dissolved air water pipe 18 is provided at the top of the floating and sinking separation device 11, the output end of the dissolved air water pipe 18 is connected with the input end of the dissolved air releaser 6, a flotation scraper 19 is provided at the top of the floating and sinking separation device 11, and the working range of the flotation scraper 19 is the top of the entire floating and sinking separation device 11, a sedimentation mud discharge pipe 20 is provided on one side of the sedimentation mud accumulation area 8, and a slag discharge pipe 21 is provided on one side of the flotation slag collection device 12. After the raw water enters the flocculation tank 2 through the water inlet pipe 1, the sludge in the raw water settles in the flocculation tank 2, and the sludge settled in the flocculation tank 2 is discharged through multiple sludge discharge pipes 3. The raw water flocculated in the flocculation tank 2 enters the flotation tank through the wall-penetrating holes 4, and the raw water passing through the wall-penetrating holes 4 is aerated by the dissolved air releaser 6. After the flotation treatment, the flocs of the raw water gradually settle on multiple flotation separation devices 11, and the flotation scum collection device 12 is used to collect the scum on the surface of the raw water. The flocs of the raw water settle in the flotation tank, and the precipitated flocs accumulate in the sedimentation sludge accumulation area 8. The raw water passing through the flotation tank enters the sedimentation water overflow weir 13 through the wall-penetrating holes 4. The raw water in the sedimentation water overflow weir 13 gradually enters the sedimentation water area 14 and the flotation water area 15, and the raw water is discharged to the filter tank through the flotation water pipe 17.

[0034] exist Figure 2 , Figure 3 and Figure 7In the embodiment, according to the flocculation effect, the multiple floating and sinking separation devices 11 inside the floating and sinking tank are distributed in three zones according to the water flow direction. The floating and sinking separation devices 11 include multiple inclined plates 23. The spacing between the inclined plates 23 in the first zone is set to 80-120 mm, the spacing between the inclined plates 23 in the second zone is 50-80 mm, and the spacing between the inclined plates 23 in the third zone is 50 mm. The first zone is close to the dissolved air releaser 6, the third zone is close to the air flotation slag collection device 12, and the second zone is between the first zone and the second zone. When the diatom content in the raw water exceeds 10 million / L, or the raw water turbidity is lower than 10 NTU, the floating and sinking tank selects to run the flotation process. When flotation is running in the flotation tank, the angle between the inclined plate 23 in the first or first two areas and the horizontal plane can be adjusted to 90 degrees according to the water quality of the raw water. Compared with ordinary flotation tanks, the originally empty flotation tank is divided into narrow spaces by multiple inclined plates 23. For some particles that are not combined with bubbles, the collision probability of bubbles and particles is increased in the narrow space, which can enhance the combination of bubbles and flocs and ensure the flotation effect of flocs. For heavier flocs, they can be precipitated on the inclined plates 23 in the second or third areas to achieve solid-liquid separation, which greatly compensates for the removal effect of some particles that fail to combine with bubbles at the position of the dissolved air releaser 6, and further ensures the water quality of the effluent.

[0035] exist Figures 7 to 10 In the embodiment, the floating and sinking separation device 11 also includes two opposite side frames 24, a plurality of inclined plates 23 arranged in parallel are arranged between the two side frames 24, and the two side frames 24 are fixedly connected by a plurality of bottom rods 25, and the plurality of inclined plates 23 correspond to the plurality of bottom rods 25 one by one, a card frame 26 is arranged on the top of the bottom rod 25, an insertion strip 27 is fixed on the bottom end of the inclined plate 23, and the inclined plate 23 is correspondingly inserted into the card frame 26 by the insertion strip 27, a ring 28 is fixed on the bottom end of the card frame 26, the ring 28 is rotatably sleeved on the surface of the bottom rod 25, and the end of the ring 28 is connected to the inner side of the side frame 24 by a torsion spring 29, and an inclined strip 30 for limiting the card frame 26 is arranged on one side of the bottom rod 25. The twisting force of the torsion spring 29 makes the card frame 26 be set vertically, that is, the opening of the card frame 26 is vertically upward, and the bottom end of the inclined plate 23 is inserted into the top of the card frame 26 by means of the insertion strip 27, pushing the inclined plate 23 to tilt, and the weight of the inclined inclined plate 23 itself makes the card frame 26 rotate on the surface of the bottom rod 25 by means of the collar 28, and the rotating collar 28 cooperates with the side frame 24 to twist the torsion spring 29 until the card frame 26 fits on the surface of the inclined bar 30, and the supporting effect of the inclined bar 30 on the card frame 26 makes the card frame 26 and the inclined plate 23 be set tilted, and the twisting force of the torsion spring 29 cooperates with the inclined bar 30 to limit the card frame 26, preventing the card frame 26 from exerting excessive pressure on the inclined bar 30, thereby avoiding deformation and damage of the inclined bar 30 under excessive pressure.

[0036] When the inclined plate 23 is damaged due to long-term use, the inclined plate 23 is pulled upward and the bottom end of the upward inclined plate 23 is separated from the card frame 26 until the insertion strip 27 is moved out of the card frame 26. At this time, the twisting force of the torsion spring 29 causes the card frame 26 to rotate in the opposite direction on the surface of the bottom rod 25 using the ring 28 until the opening of the card frame 26 is vertically upward. The new inclined plate 23 is inserted into the card frame 26 using the insertion strip 27, and the inclined plate 23 is pushed to tilt between the two side frames 24.

[0037] A plurality of inclined plates 23 are installed in parallel and inclined between two side frames 24 , and a narrow space is formed between two adjacent inclined plates 23 . The flocs in the narrow space move upwards in combination with the bubbles, and the flocs contact the inclined inclined plates 23 . The plurality of inclined inclined plates 23 are used to collect the flocs.

[0038] exist Figures 7 to 11 The top of the side frame 24 is provided with a slide groove 31, and a plurality of slide frames 32 are provided inside the slide groove 31. Two adjacent slide frames 32 are fixedly connected by connecting plates 33. The plurality of slide frames 32 and the plurality of connecting plates 33 are assembled to form a mobile frame. A square rod 34 is inserted through the center of the slide frame 32. The plurality of slide frames 32 correspond to the plurality of inclined plates 23 one by one. The side of the inclined plate 23 is provided with a side groove 35 corresponding to the square rod 34. The inner end of the square rod 34 is inserted into the inside of the side groove 35. A round frame is provided at the outer end of the slide frame 32, and the outer diameter of the round frame is greater than the height of the slide groove 31. The inner side surface of the round frame fits with the outer side surface of the side frame 24. A rotating sleeve 36 is provided on the outer side of the slide frame 32. The rotating sleeve 36 is spirally sleeved on the surface of the square rod 34. A clamping strip 37 for limiting the rotating sleeve 36 is fixed to the outer end surface of the slide frame 32. After the inclined plate 23 is vertically inserted into the top of the card frame 26, the sliding frame 32 of the mobile frame is in the sliding groove 31, and the multiple sliding frames 32 of the mobile frame correspond to the multiple inclined plates 23 one by one. The rotating sleeve 36 is twisted. Since the sliding frame 32 uses the card strip 37 to limit the rotating sleeve 36, the spiral effect of the rotating sleeve 36 and the square rod 34 makes the inner side end of the square rod 34 close to the inclined plate 23 until the inner side end of the square rod 34 is inserted into the side groove 35 of the inclined plate 23. Multiple inclined plates 23 are arranged vertically and in parallel between the two side frames 24 to push the moving frame to move. The moving frame uses multiple square rods 34 to drive the multiple inclined plates 23 to tilt. When the square rods 34 drive the inclined plates 23 to rotate, the inner ends of the square rods 34 slide inside the side grooves 35 until the end of the moving frame fits with the inner ends of the slide grooves 31. The moving frame uses the square rods 34 to support the tops of the inclined plates 23 to prevent the inclined plates 23 from tilting excessively and causing the insertion strips 27 to be deformed and damaged inside the card frame 26.

[0039] A limiting plate 38 is provided on the top of the slide frame 32 at the inner end of the slide slot 31. The limiting plate 38 is fixedly connected to the inner end of the slide frame 32. The limiting plate 38 cooperates with the circular frame to limit the slide frame 32. A convex rod 39 is fixed on the side of the limiting plate 38. The end of the convex rod 39 is chamfered. The surface of the convex rod 39 is provided with an annular groove 40. The mobile frame uses multiple circular frames to cooperate with the outer side of the slide frame 32, and the limiting plate 38 cooperates with the inner side of the slide frame 32 to facilitate the smooth movement of the mobile frame inside the slide slot 31 and prevent the mobile frame from moving out of the slide slot 31 during movement.

[0040] exist Figure 2 , Figure 7 , Fig.11 and Fig.12 In the embodiment, a baffle plate 41 is provided on the top of the side frame 24, and the baffle plate 41 is away from the inner end of the slide groove 31. A sleeve 42 is inserted at the center of the baffle plate 41, and the center line of the protruding rod 39 coincides with the center line of the sleeve 42. Two side pieces 43 are fixed to the end of the sleeve 42. A plug rod 44 penetrating the side piece 43 is fixed to the side of the baffle plate 41. A spring 45 is sleeved on the surface of the plug rod 44. One end of the spring 45 is connected to the side piece 43, and the other end of the spring 45 is connected to the outer end of the plug rod 44. Two opposite brackets 46 are provided at the bottom of the side piece 43. A clamping rod 47 penetrating the sleeve 42 is fixed on the inner side of the clamping rod 46, and the inner end of the clamping rod 47 corresponds to the annular groove 40 on the surface of the protruding rod 39. A limiting rod 48 is provided between the two brackets 46. The bracket 46 is sleeved on the surface of the limiting rod 48, and the two brackets 46 are connected by a spring sheet 49. When the flocs are accumulated too much on the surface of the inclined plate 23, the limiting plate 38 is pushed to move, and the moving limiting plate 38 drives the moving frame inside the slide groove 31, and the moving limiting plate 38 drives the protruding rod 39 to gradually approach the baffle 41, until the protruding rod 39 is inserted into the sleeve 42. Due to the chamfered setting of the end of the protruding rod 39, the protruding rod 39 uses the chamfered part to squeeze the inner end of the clamping rod 47, and the moving protruding rod 39 squeezes the clamping rod 47 so that the clamping rod 47 drives the clamping frame 46 away from the sleeve 42, and the two clamping frames 46 that are away from each other cooperate with the spring piece 49 until the annular groove 40 on the surface of the protruding rod 39 and the clamping rod 4 7, the elastic force of the spring sheet 49 makes the inner end of the clamping rod 47 clamped in the annular groove 40, and the elastic force of the spring sheet 49 is used to limit the movable frame. At this time, the movable frame uses the square rod 34 to make multiple inclined plates 23 in a vertical state. At this time, the flocs accumulated on the surface of the inclined plate 23 gradually slide down on the surface of the inclined plate 23, and the sliding flocs accumulate in the sedimentation mud area 8. By regularly rotating the inclined plate 23, when the inclined plate 23 is in a vertical state during the process, the accumulated sludge on the inclined plate 23 slides to the bottom of the floating and settling tank, ensuring that the inclined plate 23 will not be blocked by sludge accumulation.

[0041] When the moving protrusion 39 contacts the clamping rod 47, the impact force of the protrusion 39 on the clamping rod 47 causes the clamping rod 47 to drive the sleeve 42 to move at the center of the baffle 41, and the moving sleeve 42 uses the side plate 43 to squeeze the spring 45 on the surface of the insertion rod 44, and uses the elastic force of the spring 45 to absorb the impact force of the protrusion 39 on the clamping rod 47.

[0042] After the inclined plate 23 is vertically stationary for a period of time, it pushes the limiting plate 38 away from the baffle 41, and the moving limiting plate 38 drives the protruding rod 39 to be pulled out from the inside of the sleeve 42. The moving frame uses the square rod 34 to push the inclined plate 23 to rotate until the end of the moving frame corresponds to the inner end of the slide 31. At this time, the inclined setting of the inclined plate 23 is completed. When the diatom content in the raw water is less than 10 million / L and the raw water turbidity is less than 10NTU, the floating and sinking tank chooses to run the sedimentation process. When the floating and sinking tank runs the sedimentation process, the angle between the inclined plate 23 and the horizontal plane can be adjusted. Due to different raw water qualities, the flocculation effect is different, and the density of the floc size will be different. The sedimentation distance of the large-angle inclined plate 23 increases, but it is more beneficial to slippery mud and is suitable for the case of large floc density. The sedimentation distance of the small-angle inclined plate 23 is reduced, which is beneficial to the case of small floc density.

[0043] The moving frame uses the square rod 34 to tilt the inclined plate 23, until the inclined plate 23 reaches a suitable angle, the rotating sleeve 36 is screwed, and the spiral effect of the rotating sleeve 36 and the square rod 34 makes the inner end of the square rod 34 fit tightly with the inner wall of the side groove 35. The inclined plate 23 uses the reaction force of the square rod 34 on the moving frame to make the limiting plate 38 fit tightly with the inner side of the side frame 24. The static friction between the limiting plate 38 and the side frame 24 is used to limit the moving frame, so that the angle between the inclined plate 23 and the horizontal plane can be adjusted in real time according to the water quality of the raw water.

[0044] During the operation of the floating and sinking tank, the multiple inclined plates 23 of the floating and sinking separation device 11 can be adjusted between positive 45° and negative 45° according to the water quality. During the angle adjustment process, the accumulated mud on the inclined plates 23 that is not easy to settle can fall off, and the fallen mud will settle to the bottom of the floating and sinking tank, allowing the inclined plates 23 to maintain a good working condition.

[0045] S4. The raw water treated in the flotation tank is filtered through the filter tank, and disinfectant is added to the raw water. Finally, the raw water after disinfection is passed into the clean water tank.

[0046] Working principle of the present invention: Reference Figures 1 to 12As shown, the bottom end of the inclined plate 23 is inserted into the top of the card frame 26 by using the insertion strip 27. At this time, the sliding frame 32 of the movable frame is inside the sliding groove 31, and the multiple sliding frames 32 of the movable frame correspond to the multiple inclined plates 23 one by one. The rotating sleeve 36 is screwed. Since the sliding frame 32 uses the card strip 37 to limit the rotating sleeve 36, the spiral effect of the rotating sleeve 36 and the square rod 34 makes the inner end of the square rod 34 close to the inclined plate 23 until the inner end of the square rod 34 is inserted into the side groove 35 of the inclined plate 23. The limitation of multiple square rods 34 makes multiple inclined plates 23 vertically arranged in parallel between the two side frames 24.

[0047] The movable frame is pushed to move, and the movable frame uses multiple square and round rods 34 to drive multiple inclined plates 23 to tilt. When the square and round rods 34 drive the inclined plates 23 to rotate, the inner ends of the square and round rods 34 slide inside the side grooves 35 until the end of the movable frame fits with the inner ends of the slide grooves 31. The movable frame uses the square and round rods 34 to support the tops of the inclined plates 23 to prevent the inclined plates 23 from tilting excessively and causing deformation and damage of the inserts 27 inside the card frame 26. When the inclined plate 23 is tilted, the weight of the inclined plate 23 itself causes the clamping frame 26 to rotate on the surface of the bottom rod 25 using the collar 28, and the rotating collar 28 cooperates with the side frame 24 to twist the torsion spring 29 until the clamping frame 26 fits against the surface of the inclined bar 30. The supporting effect of the inclined bar 30 on the clamping frame 26 causes the clamping frame 26 and the inclined plate 23 to be tilted, and the twisting force of the torsion spring 29 cooperates with the inclined bar 30 to limit the clamping frame 26, preventing the clamping frame 26 from exerting excessive pressure on the inclined bar 30, thereby preventing the inclined bar 30 from being deformed and damaged under excessive pressure.

[0048] The movable frame is pushed to move in the opposite direction until the movable frame uses the square rod 34 to set multiple inclined plates 23 vertically, and the rotating sleeve 36 is twisted to make the inner end of the square rod 34 be pulled out from the inside of the side groove 35, and the inclined plate 23 is pulled upward, and the bottom end of the upward inclined plate 23 is disengaged from the card frame 26 until the insertion strip 27 is moved out from the inside of the card frame 26. At this time, the twisting force of the torsion spring 29 makes the card frame 26 use the ring 28 to rotate in the opposite direction on the surface of the bottom rod 25 until the opening of the card frame 26 is vertically upward, and the new inclined plate 23 is inserted into the inside of the card frame 26 using the insertion strip 27. At this time, the inclined plate 23 is pushed to tilt between the two side frames 24, which is convenient for replacing the damaged inclined plate 23.

[0049] When the flocs are accumulated too much on the surface of the inclined plate 23, the limiting plate 38 is pushed to move, and the moving limiting plate 38 drives the moving frame inside the slide groove 31, and the moving limiting plate 38 drives the protruding rod 39 to gradually approach the baffle 41, until the protruding rod 39 is inserted into the sleeve 42. Due to the chamfered setting of the end of the protruding rod 39, the protruding rod 39 uses the chamfered part to squeeze the inner end of the clamping rod 47, and the moving protruding rod 39 squeezes the clamping rod 47 so that the clamping rod 47 drives the clamping frame 46 away from the sleeve 42, and the clamping rod 47 drives the clamping frame 46 away from the sleeve 42. The two distant brackets 46 cooperate with the spring sheet 49 until the annular groove 40 on the surface of the protruding rod 39 corresponds to the inner end of the clamping rod 47. The elastic force of the spring sheet 49 makes the inner end of the clamping rod 47 clamped in the annular groove 40. The elastic force of the spring sheet 49 is used to limit the movable frame. At this time, the moving movable frame uses the square rod 34 to make multiple inclined plates 23 in a vertical state. At this time, the flocs accumulated on the surface of the inclined plate 23 gradually slide down on the surface of the inclined plate 23, and the slid down flocs accumulate in the sedimentation and sludge accumulation area 8.

[0050] After the inclined plate 23 has been standing still for a period of time, it pushes the limiting plate 38 away from the baffle 41. The moving limiting plate 38 drives the protruding rod 39 to be pulled out from the inside of the sleeve 42. The moving frame uses the square rod 34 to push the inclined plate 23 to rotate until the end of the moving frame corresponds to the inner end of the slide groove 31. At this time, the inclined setting of the inclined plate 23 is completed.

[0051] The moving frame uses the square rod 34 to tilt the inclined plate 23, until the inclined plate 23 reaches a suitable angle, the rotating sleeve 36 is screwed, and the spiral effect of the rotating sleeve 36 and the square rod 34 makes the inner end of the square rod 34 fit tightly with the inner wall of the side groove 35. The inclined plate 23 uses the reaction force of the square rod 34 on the moving frame to make the limiting plate 38 fit tightly with the inner side of the side frame 24. The static friction between the limiting plate 38 and the side frame 24 is used to limit the moving frame, so that the angle between the inclined plate 23 and the horizontal plane can be adjusted in real time according to the water quality of the raw water.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A water treatment process for a diatom-containing water source, characterized in that: The following steps are involved: S1. Pre-oxidation treatment is performed on the raw water, and the diatoms in the raw water are broken into small fragments that are easy to form flocs by pre-oxidation means; S2, adding a flocculant to the raw water after pre-oxidation treatment to directional flocculate the small diatom fragments; S3, the raw water after directional flocculation is treated by solid-liquid separation in a flotation tank; The floating and sinking separation device (11) is located in a floating and sinking pool. The floating and sinking separation device (11) further comprises two opposite side frames (24). A plurality of inclined plates (23) arranged in parallel are arranged between the two side frames (24). The two side frames (24) are fixedly connected by a plurality of bottom bars (25). The plurality of inclined plates (23) correspond to the plurality of bottom bars (25) one by one. A card frame (26) is arranged at the top of the bottom bar (25). An insertion strip (27) is fixed at the bottom end of the inclined plate (23). The inclined plate (23) is correspondingly inserted into the inside of the card frame (26) by means of the insertion strip (27). A collar (28) is fixed at the bottom end of the card frame (26). The collar (28) is rotatably sleeved on the surface of the bottom bar (25). The end of the collar (28) is connected to the inner side surface of the side frame (24) by means of a torsion spring (29). A collar (30) for limiting the card frame (26) is arranged on one side of the bottom bar (25). S4. The raw water treated in the flotation tank is filtered through the filter tank, and disinfectant is added to the raw water. Finally, the raw water after disinfection is passed into the clean water tank.

2. The water treatment process for diatom-containing water sources according to claim 1, characterized in that: A flocculation tank (2) is provided on one side of the flotation and settling tank. The output end of the water inlet pipe (1) is connected to the flocculation tank (2). Raw water is introduced into the flocculation tank (2) through the water inlet pipe (1). A plurality of mud discharge pipes (3) are provided on the bottom side of the flocculation tank (2). A through-wall hole (4) is provided on the bottom of one side of the flocculation tank (2). The raw water after flocculation enters the air flotation contact zone (5) through the through-wall hole (4). A dissolved air releaser (6) is provided inside the air flotation contact zone (5). The dissolved air releaser (6) performs aeration treatment on the raw water passing through the through-wall hole (4). A retaining wall (7) is provided on the far side of the bottom of the air flotation contact zone (5). A sedimentation and sludge accumulation zone (8) is provided on one side of the retaining wall (7). A flotation water collecting pipe (9) is provided on the top of the inner side of the sedimentation and sludge accumulation zone (8). A mud scraper (10) is provided on the inner side of the sedimentation and sludge accumulation zone (8). A plurality of floating and sinking separation devices (11) are provided on the top of the sedimentation and sludge accumulation zone (8). A flotation scum collecting device (12) is provided on one side of the separation device (11); a sedimentation water overflow weir (13) is connected to one side of the floating and sinking separation device (11) through a wall-penetrating hole (4); a sedimentation water outlet area (14) and a flotation water outlet area (15) are provided on one side of the sedimentation water overflow weir (13); a sedimentation water outlet pipe (16) is provided at the bottom of the sedimentation water outlet area (14); a flotation water outlet pipe (17) is provided at the bottom of the flotation water outlet area (15); an end of the flotation water collecting pipe (9) is connected to the bottom of the flotation water outlet area (15); a dissolved air water pipe (18) is provided on the top of the floating and sinking separation device (11); an output end of the dissolved air water pipe (18) is connected to an input end of a dissolved air releaser (6); a flotation scum scraper (19) is provided on the top of the floating and sinking separation device (11); a sedimentation mud discharge pipe (20) is provided on one side of the sedimentation mud accumulation area (8); and a scum discharge pipe (21) is provided on one side of the flotation scum collecting device (12).

3. The water treatment process for diatom-containing water sources according to claim 2, characterized in that: The input end of the dissolved air water pipe (18) is connected to the flocculation tank (2), and the flocculation tank (2) is configured as a grid flocculation tank, and a grid filler (22) is provided in the flocculation tank (2).

4. The water treatment process for diatom-containing water sources according to claim 2, characterized in that: The plurality of float-sink separation devices (11) inside the float-sink pool are distributed in three zones according to the direction of water flow. The float-sink separation devices (11) include a plurality of inclined plates (23). The spacing between the inclined plates (23) in the first zone is set to 80-120 mm, the spacing between the inclined plates (23) in the second zone is 50-80 mm, and the spacing between the inclined plates (23) in the third zone is 50 mm. The first zone is close to the dissolved air releaser (6), the third zone is close to the floating slag collection device (12), and the second zone is between the first zone and the second zone.

5. The water treatment process for diatom-containing water sources according to claim 4, characterized in that: The top of the side frame (24) is provided with a slide groove (31), a plurality of slide frames (32) are provided inside the slide groove (31), two adjacent slide frames (32) are fixedly connected by a connecting plate (33), a plurality of slide frames (32) and a plurality of connecting plates (33) are assembled to form a mobile frame, a square rod (34) is inserted through the center of the slide frame (32), the plurality of slide frames (32) correspond to the plurality of inclined plates (23) one by one, and the side of the inclined plate (23) is provided with a square rod (34) ) corresponding to the side groove (35), the inner end of the square rod (34) is inserted into the side groove (35), the outer end of the sliding frame (32) is provided with a round frame, and the outer diameter of the round frame is greater than the height of the sliding groove (31), the inner side surface of the round frame is in contact with the outer side surface of the side frame (24), the outer side of the sliding frame (32) is provided with a rotating sleeve (36), the rotating sleeve (36) is spirally sleeved on the surface of the square rod (34), and the outer end surface of the sliding frame (32) is fixed with a clamping strip (37) for limiting the rotating sleeve (36).

6. The water treatment process for diatom-containing water sources according to claim 5, characterized in that: A limiting plate (38) is provided on the top of the slide frame (32) at the inner end of the slide groove (31); the limiting plate (38) is fixedly connected to the inner end of the slide frame (32); the limiting plate (38) cooperates with the circular frame to limit the slide frame (32); a convex rod (39) is fixed on the side of the limiting plate (38); and a ring groove (40) is provided on the surface of the convex rod (39).

7. The water treatment process for diatom-containing water sources according to claim 6, characterized in that: A baffle (41) is provided on the top of the side frame (24), the baffle (41) is away from the inner end of the slide groove (31), a sleeve (42) is inserted at the center of the baffle (41), the center line of the protruding rod (39) coincides with the center line of the sleeve (42), two side pieces (43) are fixed to the end of the sleeve (42), and an insertion rod (44) penetrating the side piece (43) is fixed to the side of the baffle (41), a spring (45) is sleeved on the surface of the insertion rod (44), and one end of the spring (45) is connected to the side piece (4 3), the other end of the spring (45) is connected to the outer end of the insertion rod (44), and two opposing brackets (46) are arranged at the bottom of the side plate (43). A bracket (47) penetrating the sleeve (42) is fixed to the inner side of the bracket (46), and the inner end of the bracket (47) corresponds to the annular groove (40) on the surface of the protruding rod (39). A limiting rod (48) is arranged between the two brackets (46), and the bracket (46) is sleeved on the surface of the limiting rod (48). The two brackets (46) are connected by a spring sheet (49).

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