A float filter integrated treatment system

Abstract

The disclosed floatation and filtration integrated treatment system comprises an integrated treatment tank, a dissolved air subsystem, a slag scraping subsystem and a filtration subsystem, a water inlet is arranged on the front side wall of the integrated treatment tank, a partition plate divides the inner cavity of the integrated treatment tank into a dissolved air zone and a filtration zone, a gas outlet pipe of the dissolved air subsystem extends into the dissolved air zone, the filtration subsystem is installed on a mounting plate, a slag blocking plate is installed on the rear side of the mounting plate, a water collecting zone is arranged on the lower side of the mounting plate and the rear side of the slag blocking plate, a slag falling groove is arranged on the rear side of the filtration subsystem, the slag scraping subsystem comprises a slag scraping plate, a water collecting groove is fixed on the rear side wall of the integrated treatment tank, and a water outlet is arranged on the water collecting groove. The floatation and filtration integrated treatment system combines the air floatation tank and the filtration tank in the integrated treatment tank, has complementary effects, makes up for the shortcomings of the single air floatation tank or the single filtration tank, has the effects of land saving, energy saving, material and equipment saving, can guarantee the stable water quality and improve the water treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically an integrated flotation filter treatment system. Background Technology

[0002] Flotation and filtration are two different solid-liquid separation methods. In traditional applications, flotation tanks and filtration tanks are combined. Generally, flotation tanks and filtration tanks are set up separately and then connected in series. That is, the upstream process is flotation and the downstream process is filtration. Although this series connection method can remove both light and heavy suspended solids in the water and improve the quality of the treated water, the disadvantages of this series connection method are that it occupies a relatively large area, requires a lot of equipment and supporting units, and has high operating and maintenance costs. For example, CN107151085A discloses an integrated wastewater treatment device, comprising a coarse filtration tank, a heavy metal removal tank, an air flotation tank, an anaerobic tank, an anoxic tank, an aerobic tank, a sedimentation tank, a fiber disc filter, a sludge return tank, and a quartz sand filter tank connected in sequence. The sedimentation tank is connected to the sludge return tank, which is connected to the anaerobic tank and a sludge storage tank via pipelines. The sludge storage tank is connected to the sludge dewatering room. The aerobic tank is equipped with an aeration device. The sedimentation tank is connected to the chemical dosing room. The air flotation tank includes a pH adjustment tank, a PAC mixing tank, a PAM mixing tank, and an aeration reaction tank. The sedimentation tank includes a tank body and an intermediate cylindrical body. Although this device can solve the problem of excessive suspended solids in the effluent, it has drawbacks such as large footprint, complex equipment, and high operating and maintenance costs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an integrated flotation and filtration treatment system that organically combines an air flotation tank and a filtration tank in an integrated treatment tank. This system has a complementary effect, makes up for the shortcomings of a single air flotation tank or a single filtration tank, and has the functions of saving land, energy, materials and equipment. At the same time, it can ensure stable effluent quality and improve water treatment efficiency.

[0004] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: an integrated flotation and filtration system, comprising an integrated treatment tank, a dissolved air subsystem, a sludge scraping subsystem, and a filtration subsystem. The integrated treatment tank has an inlet on its front sidewall. An upright baffle is installed inside the integrated treatment tank, with its bottom fixed to the bottom of the tank. The baffle is positioned along the width of the integrated treatment tank, and its height is less than that of the integrated treatment tank. The baffle divides the inner cavity of the integrated treatment tank into a dissolved air zone and a filtration zone. The dissolved air zone is located near the inlet. The dissolved air subsystem and the sludge scraping subsystem are respectively installed on the integrated treatment tank. The air outlet pipe of the dissolved air subsystem extends into the dissolved air zone. The filtration subsystem is located within the filtration zone. In the upper part of the area, the filtration subsystem is mounted on a horizontally arranged mounting plate. A vertical slag baffle is installed on the rear side of the mounting plate, and the slag baffle has multiple water passage holes. A water collection area is provided on the lower side of the mounting plate and the rear side of the slag baffle. The outlet of the filtration subsystem and the multiple water passage holes are respectively connected to the water collection area. A slag discharge trough is provided on the rear side of the filtration subsystem. The slag discharge trough is fixed on the upper part of the slag baffle. A slag outlet communicating with the outside is opened on the side wall of the slag discharge trough. The slag scraping subsystem includes a slag scraper. The slag scraper is driven by a first motor. The slag scraper is located above the rear side of the filtration subsystem. A water collection trough is fixed on the rear side wall of the integrated treatment tank. The water collection trough is connected to the water collection area. A water outlet is opened on the water collection trough.

[0005] When the integrated flotation and filtration system of this invention is working, wastewater continuously enters the dissolved air zone through the inlet. First, it undergoes flotation treatment under the action of the dissolved air subsystem. Lighter suspended solids float to the surface of the water in the integrated treatment tank as scum, which is then scraped into the scum trough by a scraper and periodically discharged through the scum outlet. The water after flotation treatment then flows over the baffle into the filtration zone, where the filtration subsystem performs solid-liquid separation. The water produced after solid-liquid separation enters the collection zone through the outlet of the filtration subsystem and the water passages on the baffle plate, finally entering the collection tank and being discharged from the outlet.

[0006] The integrated flotation and filtration system of this invention organically combines an air flotation tank and a filtration tank into an integrated treatment tank, which has a complementary effect and makes up for the shortcomings of a single air flotation tank or a single filtration tank. It has the advantages of saving land, energy, materials and equipment, while ensuring stable effluent quality and improving water treatment efficiency.

[0007] Preferably, a flocculation and stirring zone is provided at the front of the integrated treatment tank. This zone is separated from the dissolved air zone by a baffle. The baffle has a connection port for linking the two zones. Several flocculation and stirring subsystems are installed on the integrated treatment tank, with their stirring heads extending into the flocculation and stirring zone. With the flocculation and stirring zone at the front of the integrated treatment tank, flocculant is added to the flocculation and stirring zone during operation of the integrated flotation system. Wastewater entering the integrated treatment tank first undergoes flocculation treatment, producing flocs, which makes subsequent air flotation treatment more thorough and improves the water treatment effect of the integrated flotation system. To avoid reduced air flotation efficiency due to mutual interference between the flocculation and stirring zone and the dissolved air zone, the present invention separates the two zones with a baffle, ensuring air flotation efficiency. In practical applications, the need for a flocculation and stirring zone can be determined based on the water quality of the wastewater being treated. If a flocculation and stirring zone is provided, the number of flocculation and stirring subsystems can be increased or decreased depending on factors such as water volume.

[0008] Furthermore, the front side of the mounting plate is fixed to a vertical plate, which is located behind the partition. The height of the vertical plate is less than the height of the partition. The bottom of the vertical plate is fixed to the bottom of the integrated treatment tank. The bottom surface of the mounting plate, the rear side of the vertical plate, the rear side of the slag baffle, and the bottom and rear side walls of the integrated treatment tank form the water collection area. The partition, the vertical plate, and the bottom wall of the integrated treatment tank form a buffer zone, which is located in front of the filtration zone. The bottom of the flocculation and stirring zone is connected to the bottom of the buffer zone via a return pipe. The function of the return pipe is to return a portion of the dissolved air water treated by air flotation to the flocculation and stirring zone to further improve the dissolved air efficiency. The inclusion of the return pipe can increase the dissolved air efficiency by 20-30%.

[0009] Alternatively, as a preferred embodiment, the front side of the mounting plate is fixed to the partition plate, and the bottom surface of the mounting plate, the rear side of the partition plate, the rear side of the slag baffle plate, and the bottom wall and rear side wall of the integrated treatment tank form the water collection area.

[0010] Furthermore, the front side of the mounting plate is a first inclined plate sloping from front to back towards the bottom of the filtration zone, and the lower part of the rear sidewall of the integrated treatment tank is a second inclined plate sloping from back to front towards the bottom of the water collection zone. The first inclined plate facilitates the flow of water treated by air flotation into the filtration zone for solid-liquid separation, while the second inclined plate acts as a buffer for the water entering the water collection zone, allowing the water to flow smoothly into the water collection tank.

[0011] Preferably, the filtration subsystem includes a filter frame and a suction washing device. The filter frame is fitted with filter cloth, and the suction washing device includes a suction cup connected to a suction cup drive device. The suction cup is positioned on the outside of the filter frame and is used to remove filter media from the filter cloth. The filtration subsystem consisting of the filter frame and the suction washing device provides good solid-liquid separation and can promptly remove dirt adsorbed on the filter cloth, ensuring effective water treatment.

[0012] Preferably, a third inclined plate is fixed to the top of the baffle plate, with the rear side of the third inclined plate higher than its front side, and the third inclined plate being positioned opposite the slag scraper. This design of the third inclined plate facilitates the collection of scum on the rear side of the filtration zone, allowing the scum to be scraped into the slag trough as much as possible.

[0013] Preferably, an outlet weir plate is installed on the upper part of the rear sidewall of the integrated treatment tank. The top of the outlet weir plate is a sawtooth overflow weir, which is set along the width direction of the outlet weir plate. During water treatment, the water in the collection area flows through the sawtooth overflow weir at the top of the outlet weir plate into the collection tank. The design of the outlet weir plate makes the water discharge more uniform.

[0014] Furthermore, the installation height of the effluent weir plate on the rear sidewall of the integrated treatment tank is adjustable. The adjustable height of the effluent weir plate with its serrated overflow weir helps improve the overall system's structural compactness. By adjusting the installation height of the effluent weir plate on the rear sidewall of the integrated treatment tank, the elevation of the liquid level in the effluent zone of the integrated flotation treatment system of this invention can be changed, thereby eliminating or reducing defects in the design, construction, or installation process. This also facilitates the installation, disassembly, and adjustment of the system, and improves the stability and safety of the system's operation.

[0015] Preferably, the water outlet is located at the bottom of the water collection tank, which allows for smoother water flow.

[0016] Compared with existing technologies, the present invention has the following advantages: The integrated flotation and filtration system of the present invention organically combines a flotation tank and a filtration tank into an integrated treatment tank, which has a complementary effect and makes up for the shortcomings of a single flotation tank or a single filtration tank. It has the functions of saving land, energy, materials and equipment, while ensuring stable effluent quality and improving water treatment efficiency. When the integrated flotation and filtration system of the present invention is working, the sewage continuously enters the dissolved air zone through the inlet. First, it undergoes flotation treatment under the action of the dissolved air subsystem. The lighter suspended solids float to the surface of the water in the integrated treatment tank in the form of scum and are scraped into the scum trough by the scum scraper. Scum can be discharged periodically through the scum outlet. The water after flotation treatment then flows over the baffle into the filtration zone, where the filtration subsystem performs solid-liquid separation. The water produced after solid-liquid separation enters the collection zone through the outlet of the filtration subsystem and the water passages on the baffle plate, and finally enters the collection tank and is discharged from the outlet. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the integrated flotation filter treatment system in Example 1;

[0018] Figure 2 This is a schematic diagram of the appearance of the outlet weir plate in Example 1;

[0019] Figure 3 This is a schematic diagram of the integrated flotation and filtration system in Example 2. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] The integrated flotation and filtration system of Example 1, such as Figure 1As shown, the system includes an integrated treatment tank 1, a dissolved air subsystem 2, a slag scraping subsystem 3, and a filtration subsystem 4. An inlet 11 is provided on the front side wall of the integrated treatment tank 1. An upright baffle 12 is installed inside the integrated treatment tank 1, with its bottom fixed to the bottom of the tank. The baffle 12 is positioned along the width of the integrated treatment tank 1, and its height is less than that of the integrated treatment tank 1. The baffle 12 divides the inner cavity of the integrated treatment tank 1 into a dissolved air zone 13 and a filtration zone 14. The dissolved air zone 13 is located near the inlet 11. The dissolved air subsystem 2 and the slag scraping subsystem 3 are respectively installed on the integrated treatment tank 1. The outlet pipe 21 of the dissolved air subsystem 2 extends into the dissolved air zone 13. The filtration subsystem 4 is located above the filtration zone 14 and is mounted on a horizontally positioned mounting plate 15. An upright slag baffle 16 is installed on the rear side of the mounting plate 15. Multiple water passages (not shown in the figure) are provided on the 6. A third inclined plate 17 is fixed on the top of the slag baffle 16. The rear side of the third inclined plate 17 is higher than the front side of the third inclined plate 17. The third inclined plate 17 is opposite to the slag scraper 31. A water collection area 18 is provided on the lower side of the mounting plate 15 and the rear side of the slag baffle 16. The outlet 40 of the filtration subsystem 4 and multiple water passages are respectively connected to the water collection area 18. A slag trough 5 is provided on the rear side of the filtration subsystem 4. The slag trough 5 is fixed on the upper part of the slag baffle 16. A slag outlet 51 connected to the outside is provided on the side wall of the slag trough 5. The slag scraper subsystem 3 includes a slag scraper 31. The slag scraper 31 is driven by a first motor (not shown in the figure). The slag scraper 31 is located above the rear side of the filtration subsystem 4. A water collection trough 6 is fixed on the rear side wall of the integrated treatment tank 1. The water collection trough 6 is connected to the water collection area 18. A water outlet 61 is provided at the bottom of the water collection trough 6.

[0022] In Example 1, a flocculation stirring zone 10 is provided on the front side of the integrated treatment tank 1. The flocculation stirring zone 10 and the dissolved gas zone 13 are separated by a baffle 8. The baffle 8 has a communication port (not shown in the figure) for connecting the flocculation stirring zone 10 and the dissolved gas zone 13. A flocculation stirring subsystem 7 is installed on the integrated treatment tank 1. The stirring head 71 of the flocculation stirring subsystem 7 extends into the flocculation stirring zone 10.

[0023] In Example 1, the front side of the mounting plate 15 is fixed to a vertical plate 151, which is located behind the partition plate 12. The height of the vertical plate 151 is less than the height of the partition plate 12. The bottom of the vertical plate 151 is fixed to the bottom of the integrated treatment tank 1. The bottom surface of the mounting plate 15, the rear side of the vertical plate 151, the rear side of the slag baffle plate 16, and the bottom and rear side walls of the integrated treatment tank 1 form a water collection area 18. The partition plate 12, the vertical plate 151, and the bottom wall of the integrated treatment tank 1 form a buffer zone 152. The buffer zone 152 is located in front of the filtration zone 14. The bottom of the flocculation and stirring zone 10 and the bottom of the buffer zone 152 are connected through a return pipe 153.

[0024] In Example 1, an effluent weir plate 19 is installed on the upper part of the rear sidewall of the integrated treatment tank 1. The installation height of the effluent weir plate 19 on the rear sidewall of the integrated treatment tank 1 is adjustable, such as... Figure 2 As shown, the top of the outlet weir plate 19 is a sawtooth overflow weir, which is set along the width direction of the outlet weir plate 19. During the water treatment process, the water in the water collection area 18 flows through the sawtooth overflow weir at the top of the outlet weir plate into the water collection tank 6.

[0025] In Example 1, the dissolved air subsystem 2, the slag scraping subsystem 3, the filtration subsystem 4, and the flocculation and stirring subsystem 7 all adopt existing technologies. Among them, the filtration subsystem 4 can use the filter element disclosed in ZL 200910097605.6 "A Filtration Pool".

[0026] When the integrated flotation and filtration system of Example 1 is working, wastewater continuously enters the dissolved air zone 13 from the inlet 11. First, it undergoes flotation treatment under the action of the dissolved air subsystem 2. Lighter suspended solids float to the surface of the water in the integrated treatment tank 1 as scum, which is then scraped into the scum trough 5 by the scraper plate 31. Scum can be periodically discharged through the scum outlet 51. The water after flotation treatment then flows over the baffle plate 12 into the filtration zone 14, where solid-liquid separation is performed by the filtration subsystem 4. The water produced after solid-liquid separation enters the collection zone 18 from the outlet 40 of the filtration subsystem 4 and the water passages on the baffle plate 16, then flows through the sawtooth overflow weir at the top of the outlet weir plate 19 into the collection tank 6, and finally is discharged from the outlet 61.

[0027] The difference between the integrated flotation and filtration system in Example 2 and Example 1 is that, in Example 2, as... Figure 3 As shown, the front side of the mounting plate 15 is fixed to the partition plate 12. The bottom surface of the mounting plate 15, the rear side of the partition plate 12, the rear side of the slag baffle plate 16, and the bottom and rear side walls of the integrated treatment tank 1 form a water collection area 18. The front side of the mounting plate 15 is a first inclined plate 154 that slopes from front to back towards the bottom of the filter area 14. The lower part of the rear side wall of the integrated treatment tank 1 is a second inclined plate 155 that slopes from back to front towards the bottom of the water collection area 18. The outlet 61 is located on the side of the water collection tank 6.

[0028] The difference between the integrated flotation and filtration system of Example 3 and Example 1 is that, in Example 3, the filtration subsystem 4 includes a filter frame 41 and a suction and washing device. The filter frame 41 is fitted with a filter cloth 42, and the suction and washing device includes a suction cup 43 connected to a suction cup drive device 44. The suction cup 43 is located on the outside of the filter frame 41 and is used to remove the filtered material from the filter cloth 42. The filter frame can be the "Filter Cartridge Frame" disclosed in ZL 200920122818.5, and the suction and washing device can be the "Suction and Washing Device for Filter Beds" disclosed in ZL 200910100890.2.

Claims

1. An integrated flotation filter treatment system, characterized in that, The system includes an integrated treatment tank, a dissolved air subsystem, a sludge scraping subsystem, and a filtration subsystem. The integrated treatment tank has an inlet on its front side wall. An upright baffle is installed inside the integrated treatment tank, its bottom fixed to the bottom of the tank. The baffle is positioned along the width of the integrated treatment tank, and its height is less than the tank's height. The baffle divides the tank's interior into a dissolved air zone and a filtration zone. The dissolved air zone is located near the inlet. The dissolved air subsystem and the sludge scraping subsystem are respectively installed on the integrated treatment tank. The dissolved air subsystem's outlet pipe extends into the dissolved air zone. The filtration subsystem is located above the filtration zone and is mounted on a horizontally arranged mounting plate. An upright sludge baffle with multiple water passages is installed on the rear side of the mounting plate. A water collection area is located on the lower side of the mounting plate and the rear side of the sludge baffle. The outlet of the filtration subsystem and the multiple water passages are respectively connected to the water collection area. A slag trough is provided on the rear side of the filtration subsystem. The slag trough is fixed to the upper part of the slag baffle plate. A slag outlet communicating with the outside is opened on the side wall of the slag trough. The slag scraping subsystem includes a slag scraping plate. The slag scraping plate is driven by a first motor and is located above the rear side of the filtration subsystem. A water collection trough is fixed on the rear side wall of the integrated treatment tank. The water collection trough is connected to the water collection area. A water outlet is opened on the water collection trough. The front side of the mounting plate is fixed to the partition plate. The bottom surface of the mounting plate, the rear side of the partition plate, the rear side of the slag baffle plate, and the bottom wall and rear side wall of the integrated treatment tank form the water collection area. The front side of the mounting plate is a first inclined plate that slopes from front to back towards the bottom of the filtration area. The lower part of the rear side wall of the integrated treatment tank is a second inclined plate that slopes from back to front towards the bottom of the water collection area. The integrated treatment tank is provided with a flocculation and stirring zone at the front. The flocculation and stirring zone is separated from the dissolved gas zone by a baffle. The baffle is provided with a communication port for connecting the flocculation and stirring zone and the dissolved gas zone. Several flocculation and stirring subsystems are installed on the integrated treatment tank. The stirring head of the flocculation and stirring subsystem extends into the flocculation and stirring zone. The front side of the mounting plate is fixed to a vertical plate, which is located behind the partition. The height of the vertical plate is less than the height of the partition. The bottom of the vertical plate is fixed to the bottom of the integrated treatment tank. The bottom surface of the mounting plate, the rear side of the vertical plate, the rear side of the slag baffle, and the bottom and rear side walls of the integrated treatment tank form the water collection area. The partition, the vertical plate, and the bottom wall of the integrated treatment tank form a buffer zone. The buffer zone is located in front of the filtration zone. The bottom of the flocculation and stirring zone is connected to the bottom of the buffer zone via a return pipe. The top of the slag baffle is fixed with a third inclined plate, the rear side of the third inclined plate is higher than the front side of the third inclined plate, and the third inclined plate is positioned opposite to the slag scraper.

2. The integrated flotation filter treatment system according to claim 1, characterized in that, The filtration subsystem includes a filter frame and a suction washing device. The filter frame is equipped with a filter cloth, and the suction washing device includes a suction cup connected to a suction cup driving device. The suction cup is located on the outside of the filter frame and is used to remove the filtered material from the filter cloth.

3. The integrated flotation filter treatment system according to claim 1, characterized in that, The water outlet is located at the bottom of the water collection tank.

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