Water treatment device for rainwater recovery

Abstract

The utility model relates to the technical field of rainwater recovery, in particular to a water treatment device for rainwater recovery, which comprises a horizontal flow sedimentation tank, a plate-and-frame filter press, a sedimentation water production tank, an air flotation machine, a transition water tank, a fiber ball filter and a clean water tank. Through efficient cooperation of the horizontal flow sedimentation tank, the air flotation machine, the fiber ball filter and the plate-and-frame filter press, large-particle suspended solids and colloid pollutants are removed in a grading manner, meanwhile, sludge discharge reduction treatment is performed, the quality of produced water is stable and reaches the standard, and the problem of high-turbidity rainwater treatment is solved.

Description

Technical Field

[0001] This utility model relates to the field of rainwater harvesting technology, specifically to a water treatment device for rainwater harvesting. Background Technology

[0002] Rainwater harvesting refers to the process of collecting, concentrating, storing, and utilizing rainwater flowing from natural or artificial rainwater harvesting surfaces to extract water from the water cycle for human use.

[0003] Existing technologies can use wastewater treatment equipment for deep rainwater recycling, which generally involves collection, pretreatment, storage, deep treatment, and reuse.

[0004] For example, patent CN 220265493 U discloses a rainwater harvesting and reuse system, which includes a rainwater collection tank, a tubular coagulant, a high-efficiency sedimentation tank, a high-efficiency sand filter, an ultraviolet sterilizer, and a rainwater clear water tank connected in sequence through pipelines. It also includes a backwashing component arranged in parallel with the ultraviolet sterilizer, as well as multiple electrically controlled valves distributed on the pipelines. The ultraviolet sterilizer and the backwashing component can only be used alternately. After collecting, settling, filtering, and sterilizing rainwater, this patent can obtain usable greywater, which solves the problem that the existing rainwater pollution level is much lower than that of domestic sewage, but it flows into the sewage treatment plant for purification treatment together with domestic sewage through rainwater pipes, thus preventing the effective utilization of rainwater.

[0005] For example, patent CN 217972856 U discloses a rainwater harvesting, treatment, and reuse system, including a rainwater harvesting device and a rainwater treatment device. The rainwater harvesting device includes a rainwater collection pool and several pipes connected to the rainwater collection pool. The rainwater treatment device includes a flocculation sedimentation pool, a sand filter, an ozone oxidation pool, an activated carbon adsorption filter, and a reuse water storage pool. The rainwater harvesting pool, flocculation sedimentation pool, sand filter, ozone oxidation pool, activated carbon adsorption filter, and reuse water storage pool are sequentially connected. The ozone oxidation pool is equipped with an ozone generator and a tail gas destroyer. This system collects rainwater and performs flocculation sedimentation, ozone oxidation, and activated carbon adsorption treatment, reducing organic and inorganic pollutants in the rainwater. This helps the rainwater meet reuse water quality requirements after deep purification, providing an effective way to solve regional water shortages.

[0006] The aforementioned patents all use processes such as "sedimentation + sand filtration + oxidation" as the core technology for treating rainwater. Their technical drawback is that for high-turbidity rainwater obtained by road flow, the rainwater contains a lot of large particulate suspended matter and colloidal pollutants (suspended particles, heavy metal colloids, organic colloids, etc.), which are difficult to remove effectively by traditional sedimentation, filtration, oxidation and other processes, thus affecting the quality of the produced water. Utility Model Content

[0007] To address the technical problem of the difficulty in effectively removing large particulate suspended solids and colloidal pollutants in existing rainwater harvesting processes, which affects the quality of produced water, this utility model provides a water treatment device for rainwater harvesting. Through the efficient synergy of a horizontal flow sedimentation tank, an air flotation machine, a fiber ball filter, and a plate and frame filter press, it achieves graded removal of large particulate suspended solids and colloidal pollutants, while reducing the volume of sludge discharged, ensuring stable and compliant produced water quality, and solving the problem of high-turbidity rainwater treatment.

[0008] The technical solution adopted in this utility model is as follows:

[0009] A water treatment device for rainwater harvesting includes:

[0010] The horizontal flow sedimentation tank is equipped with a sludge suction pump at the bottom, and the output end of the sludge suction pump is connected to the input end of the sludge tank through a pipeline.

[0011] The plate and frame filter press has its input end connected to the output end of a pneumatic diaphragm pump via a pipe. The input end of the pneumatic diaphragm pump is connected to a pipe that extends into the bottom of the sludge tank.

[0012] A sedimentation product water tank is connected to a horizontal flow sedimentation tank via an overflow channel.

[0013] The air flotation machine has its inlet end connected to the output end of a booster pump via a pipe, and the input end of the booster pump is connected to a pipe that extends into the bottom of the sedimentation tank.

[0014] The transition water tank has its inlet connected to the outlet of the air flotation unit via a pipe.

[0015] The fiber ball filter has its input end connected to the output end of the water supply pump, and the input end of the water supply pump is connected to a pipe that extends into the bottom of the transition water tank.

[0016] The water inlet of the clear water tank is connected to the output of the fiber ball filter via a pipe.

[0017] It should be further noted that a chain-type sludge scraper is installed inside the horizontal flow sedimentation tank. The chain-type sludge scraper mainly consists of a drive unit, a drive wheel assembly, guide rails and brackets, scraper assembly, driven wheel assembly, chain tensioning mechanism, and sludge collection pipe. During operation, the drive unit drives the chain, which in turn drives the scraper to rotate continuously in the tank, scraping the sludge from the bottom of the tank to the sludge collection trough.

[0018] It should be further noted that the output end of the booster pump is also connected to the inlet end of the transition water tank via a pipeline.

[0019] It should be further explained that this also includes a bactericide dosing device. The output of the bactericide dosing device is connected via pipeline to the input of the horizontal flow sedimentation tank, the inlet of the dissolved air flotation (DAF) machine, and the inlet of the clear water tank. Adding bactericide at the front end of the horizontal flow sedimentation tank can initially inhibit bacteria and other microorganisms in the wastewater before the sedimentation process, preventing excessive microbial growth that could affect the sedimentation effect. Adding bactericide at the inlet of the DAF machine allows for better removal of bacterial impurities during DAF treatment, improving DAF efficiency. Adding bactericide at the inlet of the clear water tank provides final sterilization treatment to the produced water, ensuring that the water quality meets standards.

[0020] It should be further noted that this also includes a flocculant dosing device, the output of which is connected via a pipeline to the input of the horizontal flow sedimentation tank and the inlet of the dissolved air flotation (DAF) unit. When flocculant is added to the front end of the horizontal flow sedimentation tank, it causes fine suspended particles and colloidal substances in the wastewater to agglomerate into larger flocs, accelerating the sedimentation process, improving sedimentation efficiency, and allowing impurities in the wastewater to be better separated in the sedimentation tank. Adding flocculant at the inlet of the DAF unit makes it easier for the flocs and colloids formed by impurities to adhere to the microbubbles, thereby achieving more effective solid-liquid separation during the DAF process, improving the DAF treatment effect, and further ensuring the quality of the effluent.

[0021] It should be further noted that the sludge outlet of the dissolved air flotation (DAF) machine is connected to the inlet of the sludge tank via a pipeline. This allows the sludge from the horizontal sedimentation tank and the scum from the DAF to be combined and dewatered through pressure filtration, resulting in a sludge volume reduction of over 50%.

[0022] It should be further noted that the fiber ball filter is equipped with a backwashing system. This system has a backwash water inlet, which is connected to the output of the backwash pump via a pipe. The input of the backwash pump is connected to a transition water tank via a pipe. When backwashing is required, the backwash pump starts, drawing backwash water from the transition water tank. The transition water tank stores intermediate permeable water, providing a stable water source with suitable quality for backwashing.

[0023] It should be further noted that the system also includes an equalization tank. The input end of the equalization tank is connected to the outlet end of the plate and frame filter press via a pipe, and the output end is connected to the input end of the horizontal flow sedimentation tank via a pipe. The equalization tank regulates the water quality and quantity flowing out of the plate and frame filter press, balancing water quality, buffering water quantity fluctuations, and enabling water recycling. Furthermore, collected rainwater can enter the equalization tank before entering the horizontal flow sedimentation tank to balance rainwater flow and water quality fluctuations.

[0024] The beneficial effects of this utility model are as follows:

[0025] (1) This utility model can remove large suspended solids (>100μm) in the rainwater in the horizontal flow sedimentation tank, and at the same time use the air flotation machine to capture fine particles, colloids (10-100μm) and oil in the rainwater. Finally, the fiber ball filter deeply intercepts the remaining colloids and some dissolved pollutants in the rainwater, thus realizing the graded removal of pollutants in the rainwater.

[0026] (2) This utility model can replace chemical flocculants through the physical adsorption of microbubbles in the air flotation machine. At the same time, the fiber ball filter material in the fiber ball filter can be regenerated and reused, reducing the generation of solid waste.

[0027] (3) This utility model can pump the sludge settled in the horizontal sedimentation tank to the plate and frame filter press for treatment, avoiding the technical problem of direct discharge of sludge in the traditional system which is prone to secondary pollution. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the specific embodiment of this utility model.

[0030] In the diagram, 1-plate and frame filter press, 2-bactericide dosing device, 3-sludge tank, 4-sludge suction pump, 5-horizontal flow sedimentation tank, 6-overflow channel, 7-sedimentation water production tank, 8-flocculator dosing device, 9-air flotation machine, 10-transition water tank, 11-fiber ball filter, 12-clear water tank, 13-pneumatic diaphragm pump, 14-booster pump, 15-water supply pump, 16-chain plate scraper. Detailed Implementation

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

[0032] Example 1

[0033] Combination Figure 1 This utility model provides a water treatment device for rainwater harvesting, comprising:

[0034] The horizontal flow sedimentation tank 5 is equipped with a sludge suction pump 4 at the bottom of the horizontal flow sedimentation tank 5. The output end of the sludge suction pump 4 is connected to the input end of the sludge tank 3 through a pipeline.

[0035] Plate and frame filter press 1, the input end of plate and frame filter press 1 is connected to the output end of pneumatic diaphragm pump 13 through a pipe, and the input end of pneumatic diaphragm pump 13 is connected to a pipe that extends into the bottom of sludge tank 3.

[0036] Sedimentation product water tank 7 is connected to horizontal flow sedimentation tank 5 through overflow channel 6;

[0037] The air flotation machine 9 has its inlet end connected to the output end of the booster pump 14 via a pipe, and the input end of the booster pump 14 is connected to a pipe that extends into the bottom of the sedimentation water production tank 7.

[0038] The transition water tank 10 has its inlet end connected to the outlet end of the air flotation machine 9 via a pipe.

[0039] Fiber ball filter 11, the input end of fiber ball filter 11 is connected to the output end of water supply pump 15, and the input end of water supply pump 15 is connected to a pipe that extends into the bottom of transition water tank 10.

[0040] The water inlet of the water tank 12 is connected to the output of the fiber ball filter 11 via a pipe.

[0041] The working process of this utility model is as follows:

[0042] After being intercepted by a screen, rainwater enters a horizontal flow sedimentation tank 5 to remove large suspended solids. The length-to-width ratio of the horizontal flow sedimentation tank 5 is ≥4:1, and the surface loading is 1.0-1.5m. 3 / (m 2 ·h); After sedimentation, rainwater overflows into sedimentation production tank 7. The settled sludge is deposited at the bottom of the horizontal flow sedimentation tank 5. Under the action of sludge suction pump 4, the sludge at the bottom of the tank is pumped to plate and frame filter press 1 for filtration to obtain sludge filter cake. The filter plate material in plate and frame filter press 1 is polypropylene, the filtration pressure is 0.6-1.0MPa, and the moisture content of the sludge after dewatering is ≤40%.

[0043] The water produced in the sedimentation water production tank 7 is pumped to the air flotation machine 9 under the action of the booster pump 14. The air flotation machine 9 uses a microbubble generator (bubble diameter 30-50μm) to remove fine particles and colloids through microbubble adsorption. The hydraulic retention time of the air flotation machine 9 is 15-20 minutes. The sludge discharged from the sludge outlet of the air flotation machine 9 is transported to the sludge tank 3.

[0044] The effluent from the flotation unit 9 is temporarily stored in the transition water tank 10. Under the action of the water supply pump 15, the water in the transition water tank 10 is pumped to the fiber ball filter 11 for deep filtration. The filter media in the fiber ball filter 11 is modified fiber balls (30-50mm in diameter) with a packing density of 80-120kg / m³. 3 The filtration rate is 15-25 m / h, and after deep filtration, the rainwater enters the clear water tank 12 for storage.

[0045] In some specific embodiments, a chain-type scraper 16 is installed inside the horizontal flow sedimentation tank 5. In the structure of the chain-type scraper 16, the drive device drives the chain, and the chain drives the scraper to make continuous rotary motion in the horizontal flow sedimentation tank 5, scraping the sludge at the bottom of the tank to the sludge collection trough for further removal of the sludge deposited at the bottom of the tank.

[0046] In some specific embodiments, the output end of the booster pump 14 is also connected to the inlet end of the transition water tank 10 via a pipeline. In some rainwater that does not require treatment by the flotation machine 9, the rainwater is treated by the sedimentation water production tank 7 and then directly pumped into the transition water tank 10 via a cross-line, saving treatment steps.

[0047] In some specific embodiments, this utility model also includes a bactericide dosing device 2. The output end of the bactericide dosing device 2 is connected via a pipeline to the input end of the horizontal flow sedimentation tank 5, the inlet end of the air flotation machine 9, and the inlet end of the clear water tank 12. By adding bactericide to the front end of the horizontal flow sedimentation tank 5 using the bactericide dosing device 2, bacteria and other microorganisms in the wastewater can be initially inhibited before the sedimentation process, preventing the excessive proliferation of microorganisms during sedimentation and thus affecting the sedimentation effect. Adding bactericide to the inlet end of the air flotation machine 9 using the bactericide dosing device 2 can better remove bacterial impurities during air flotation treatment, improving air flotation efficiency. Adding bactericide to the inlet end of the clear water tank 12 using the bactericide dosing device 2 allows for final sterilization treatment of the produced water, ensuring that the water quality meets standards.

[0048] In some specific embodiments, a flocculant dosing device 8 is also included. The output end of the flocculant dosing device 8 is connected via a pipeline to the input end of the horizontal flow sedimentation tank 5 and the inlet end of the air flotation machine 9. This enables the dosing of flocculant into the horizontal flow sedimentation tank 5 and the air flotation machine 9.

[0049] In some specific embodiments, the sludge outlet of the dissolved air flotation unit 9 is connected to the input end of the sludge tank 3 via a pipeline. This allows the sludge from the horizontal sedimentation tank 5 and the scum from the dissolved air flotation unit to be combined and dewatered through pressure filtration, achieving synergistic volume reduction for sludge discharge.

[0050] In some specific embodiments, the fiber ball filter 11 is equipped with a backwashing system. Backwashing is triggered when the pressure difference of the fiber ball filter 11 is >0.15MPa. The backwashing system has a backwash water inlet, which is connected to the output of the backwash pump via a pipeline. The input of the backwash pump is connected to the transition water tank 10 via a pipeline. When backwashing is required, the backwash pump is started, drawing backwash water from the transition water tank 10. The transition water tank 10 stores intermediate permeable water, providing a stable water source with suitable water quality for backwashing.

[0051] In some specific embodiments, the present invention also includes an equalization tank, the input end of which is connected to the outlet end of the plate and frame filter press 1 via a pipe, and the output end of which is connected to the input end of the horizontal flow sedimentation tank 5 via a pipe.

[0052] In some specific embodiments, this utility model also includes a turbidity meter, a flow meter, and a pressure sensor. All of the above components are linked to a PLC controller. The turbidity meter is set at the input end of the horizontal flow sedimentation tank 5 and the inlet end of the air flotation machine 9. It automatically adjusts the residence time of the horizontal flow sedimentation tank 5 (range 1-3 hours) according to the turbidity of the inlet water, and dynamically adjusts the dissolved air volume of the air flotation machine 9 according to the turbidity data (starting when SS>200mg / L). The pressure sensor is set at the inlet end and outlet end of the fiber ball filter 11. Backwashing is triggered when the pressure difference of the fiber ball filter 11>0.15MPa.

[0053] In some specific implementations, the horizontal flow sedimentation tank 5 and the air flotation machine 9 are stacked one above the other, which can reduce the floor space by 40%. At the same time, the stacked arrangement eliminates the need for water pumps, allowing for gravity flow and reducing power consumption.

[0054] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the present invention by those skilled in the art without departing from the spirit and essence of the present invention, and such modifications or substitutions should all be within the scope of the present invention. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should also be included within the protection scope of the present invention.

Claims

1. A water treatment device for rainwater harvesting, characterized in that, include: The horizontal flow sedimentation tank is equipped with a sludge suction pump at the bottom, and the output end of the sludge suction pump is connected to the input end of the sludge tank through a pipeline. The plate and frame filter press has its input end connected to the output end of a pneumatic diaphragm pump via a pipe. The input end of the pneumatic diaphragm pump is connected to a pipe that extends into the bottom of the sludge tank. A sedimentation product water tank is connected to a horizontal flow sedimentation tank via an overflow channel. The air flotation machine has its inlet end connected to the output end of a booster pump via a pipe, and the input end of the booster pump is connected to a pipe that extends into the bottom of the sedimentation tank. The transition water tank has its inlet connected to the outlet of the air flotation unit via a pipe. The fiber ball filter has its input end connected to the output end of the water supply pump, and the input end of the water supply pump is connected to a pipe that extends into the bottom of the transition water tank. The water inlet of the clear water tank is connected to the output of the fiber ball filter via a pipe.

2. The water treatment device for rainwater harvesting as described in claim 1, characterized in that, A chain-plate scraper is installed inside the horizontal flow sedimentation tank.

3. A water treatment device for rainwater harvesting as described in claim 1 or 2, characterized in that, The output end of the booster pump is also connected to the inlet end of the transition water tank via a pipeline.

4. A water treatment device for rainwater harvesting as described in claim 1 or 2, characterized in that, It also includes a bactericide dosing device, the output of which is connected via a pipeline to the input of the horizontal sedimentation tank, the inlet of the air flotation machine, and the inlet of the clear water tank.

5. A water treatment device for rainwater harvesting as described in claim 1, characterized in that, It also includes a flocculant dosing device, the output of which is connected to the input of the horizontal sedimentation tank and the inlet of the air flotation machine via a pipeline.

6. A water treatment device for rainwater harvesting as described in claim 1 or 2, characterized in that, The sludge outlet of the air flotation machine is connected to the inlet of the sludge tank via a pipe.

7. A water treatment device for rainwater harvesting as described in claim 1, characterized in that, The fiber ball filter is equipped with a backwashing system, which has a backwash water inlet. The backwash water inlet is connected to the output of the backwash pump through a pipe, and the input of the backwash pump is connected to the transition water tank through a pipe.

8. A water treatment device for rainwater harvesting as described in claim 1, characterized in that, It also includes an equalization tank, the input end of which is connected to the outlet end of the plate and frame filter press via a pipeline, and the output end of which is connected to the input end of the horizontal flow sedimentation tank via a pipeline.

Images