Filtering device for water treatment and filtering system

Abstract

The utility model discloses a filter device and filter system for water treatment, and the device comprises: annular conveyer belt, a plurality of filter material bearing frame, fixed mounting is in annular conveyer belt, and a plurality of filter material bearing frame are spaced apart distribution on the circumference of annular conveyer belt, and filter material bearing frame has the openwork structure for liquid outflow, composite filter material filling layer, fixed filling in each filter material bearing frame, rotation drive mechanism is connected with annular conveyer belt to drive annular conveyer belt rotation and drive filter material bearing frame rotation with annular conveyer belt. The utility model discloses a filter device for water treatment through rotation drive mechanism and drive annular conveyer belt, make filter material bearing frame and its inside composite filter material filling layer circulate and move, so that adhering material is not easy to form permanent package layer on filter material surface, has more opportunity to be removed, adopts composite filter material filling layer to improve the filtration effect, reduces secondary pollution, and mechanical structure is simple, and the difficulty of manufacture, installation and maintenance is low.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment equipment technology, and in particular to a water treatment filtration device and filtration system based on biochar-loaded magnesium oxide and trace metal salts for removing pollutants such as phosphorus. Background Technology

[0002] The filtrate from dewatered sludge produced by urban wastewater treatment plants contains high concentrations of phosphorus. Direct discharge without effective treatment can lead to eutrophication of water bodies. Current sludge dewatering filtrate devices or patents suffer from the following main drawbacks:

[0003] 1. The problem of filter media clogging is prominent: Traditional fixed bed filter media (such as plate and frame filter presses and belt filter presses) are prone to being covered by sludge particles or sticky substances due to static contact, requiring frequent cleaning or replacement of filter cloth, which increases maintenance costs.

[0004] 2. High dependence on chemical reagents: Existing technologies (such as patent CN202411103025.4) enhance dehydration by adding anionic polymers or metal salts, but excessive reagents may cause secondary pollution and have high operating costs. Although centrifugal dehydrators use less reagents, the equipment is dependent on imports, resulting in high investment costs.

[0005] 3. Limited adaptability: The screw press dewatering machine (patent CN113387534B) has poor treatment effect on oily or highly viscous sludge, and the moisture content of the sludge cake fluctuates greatly; the belt filter press has strict requirements for the uniformity of sludge particles and is difficult to cope with complex sludge characteristics.

[0006] 4. Energy consumption and complex structure: Thermal drying technology (such as patent CN116040911B) requires atomization and pulverization equipment, resulting in high energy consumption and investment costs; mechanical filter press equipment (such as patent CN202410827912.X) has a complex structure and is difficult to maintain.

[0007] Therefore, it is necessary to develop a filtration device that is simple in structure, has good decontamination effect, is not easy to clog, and has low cost to remove harmful substances such as phosphorus from wastewater. Utility Model Content

[0008] This utility model proposes a filtration device and filtration system for water treatment to solve the above-mentioned problems.

[0009] In a first aspect, embodiments of this utility model disclose a filtration device for water treatment, comprising:

[0010] Circular conveyor belt;

[0011] Multiple filter media support frames are fixedly installed on the annular conveyor belt, and the multiple filter media support frames are distributed at intervals in the circumferential direction of the annular conveyor belt. The filter media support frames have a hollow structure for liquid to flow out.

[0012] The composite filter media filling layer is fixedly filled within each filter media support frame;

[0013] A rotary drive mechanism is connected to the annular conveyor belt to drive the annular conveyor belt to rotate, thereby causing the filter media support frame to rotate with the annular conveyor belt.

[0014] By adopting the above technical solution, the water treatment filtration device provided by this utility model uses a rotary drive mechanism to drive an annular conveyor belt, causing the filter media support frame and its internal composite filter media filling layer to circulate. Adhesive substances are less likely to form a permanent coating on the filter media surface, allowing for greater removal and eliminating the need for frequent shutdowns to replace or clean the filter media, thus significantly reducing maintenance costs and downtime. The composite filter media filling layer can efficiently remove phosphorus through physical adsorption, chemical precipitation, or biological processes (such as denitrification), reducing operating costs and avoiding the risk of secondary pollution caused by excessive reagent dosage. The core components of this water treatment filtration device are only the annular conveyor belt, the filter media frame, and the drive mechanism, resulting in a simple mechanical structure and low difficulty in manufacturing, installation, and maintenance.

[0015] According to another specific embodiment of the present invention, the composite filter material filling layer is a carbon-based filter material loaded with magnesium oxide.

[0016] According to another specific embodiment of this utility model, the thickness of the composite filter material filling layer is 30-50cm.

[0017] According to another specific embodiment of the present invention, the rotary drive mechanism includes: two parallel rotating drums located on the inner ring of the annular conveyor belt; two drive members; and a transmission mechanism configured to transmit the power of each drive member to the corresponding rotating drum to drive the two rotating drums to rotate independently.

[0018] According to another specific embodiment of the present invention, it further includes: a filtrate collection tank for receiving the filtered liquid, the filtrate collection tank being located below the annular conveyor belt.

[0019] According to another specific embodiment of the present invention, it further includes: a multi-layer filter screen installed inside the filtrate collection box, wherein the multi-layer filter screen is arranged sequentially in the height direction of the filtrate collection box.

[0020] According to another specific embodiment of the present invention, the pore size of the filter screen near the bottom of the filtrate collection box is smaller than the pore size of the filter screen away from the filtrate collection box.

[0021] According to another specific embodiment of the present invention, it further includes: a filter residue collection box located below the annular conveyor belt and having an opening facing the annular conveyor belt; and a filter residue conveying mechanism installed in the filter residue collection box for outputting filter residue.

[0022] According to another specific embodiment of the present invention, it further includes: a vibration mechanism, which is fixedly installed on the side of the annular conveyor belt and is used to vibrate the filter material support frame.

[0023] Secondly, embodiments of this utility model disclose a filtration system, including the above-mentioned water treatment filtration device.

[0024] Using the above technical solution, the filtration system provided by this utility model uses a rotary drive mechanism to drive an annular conveyor belt, causing the filter media support frame and its internal composite filter media filling layer to circulate. Adhesive substances are less likely to form a permanent coating on the filter media surface, allowing for greater removal and eliminating the need for frequent shutdowns to replace or clean the filter media, thus significantly reducing maintenance costs and downtime. The composite filter media filling layer can efficiently remove phosphorus through physical adsorption, chemical precipitation, or biological processes (such as denitrification), reducing operating costs and avoiding the risk of secondary pollution caused by excessive reagent dosage. The core components of this water treatment filtration device are only the annular conveyor belt, the filter media frame, and the drive mechanism; the mechanical structure is simple, and manufacturing, installation, and maintenance are easy. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the water treatment filtration device in an embodiment of the present invention;

[0026] Figure 2 This is a top view of the water treatment filtration device in an embodiment of the present invention;

[0027] Figure 3 This invention illustrates an embodiment of the present invention. Figure 2 A schematic diagram of the cross-sectional structure along section AA.

[0028] Figure label:

[0029] 1. Circular conveyor belt; 2. Filter media support frame; 3. Rotary drive mechanism; 31. Rotary drum; 32. Rotary shaft; 4. Filtrate collection tank; 41. Drainage channel. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0031] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0033] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0035] Firstly, reference Figure 1 , Figure 2 and Figure 3As shown, an embodiment of this utility model discloses a filtration device for water treatment, including: an annular conveyor belt 1, multiple filter media support frames 2, a composite filter media filling layer (not shown), and a rotary drive mechanism 3; the multiple filter media support frames 2 are fixedly installed on the annular conveyor belt 1, and the multiple filter media support frames 2 are spaced apart in the circumferential direction of the annular conveyor belt 1, and the filter media support frames 2 have a hollow structure for liquid to flow out; the composite filter media filling layer is fixedly filled in each filter media support frame 2; the rotary drive mechanism 3 is connected to the annular conveyor belt 1 to drive the annular conveyor belt 1 to rotate, thereby driving the filter media support frames 2 to rotate with the annular conveyor belt 1.

[0036] The water treatment filtration device provided in this embodiment uses a rotary drive mechanism 3 to drive an annular conveyor belt 1, causing the filter media support frame 2 and its internal composite filter media filling layer to circulate. Each filter media support frame 2 periodically experiences a "working zone" (filtering sludge and filtrate) and a "non-working zone," thus causing the filter media support frame 2 to synchronously and periodically experience both zones. In other words, the filter media in the composite filter media filling layer operates dynamically and intermittently. In the non-working zone (mainly referring to the area where the filter media support frame is located below the lower annular conveyor belt), the filter media can easily detach trapped solids by gravity, slight vibration, or a simple rinsing device. This achieves automatic cleaning during continuous operation, eliminating the need for frequent shutdowns to replace or clean the filter media, significantly reducing maintenance costs and downtime.

[0037] A composite filter media packing layer is a physical structural unit composed of numerous solid filter media particles. Its function is to act as an interface or site, allowing the fluid to pass through and undergo physical and chemical processes within it. Composite filter media packing layers can efficiently remove phosphorus through physical adsorption, chemical precipitation, or biological processes (such as denitrification), without requiring or significantly reducing the addition of chemical agents (usually liquid or easily soluble solids) such as anionic polymers and metal salts. This not only reduces operating costs but also avoids the risk of secondary pollution caused by excessive reagent dosage.

[0038] Because the filter media operates dynamically and intermittently, adhering substances are less likely to form a permanent coating on the surface of the filter media. They have more opportunities to be removed in the "non-working area," ensuring the filtration effect and filtration efficiency. The phosphorus removal rate can reach more than 90%.

[0039] The core components of this water treatment filtration device are only a ring conveyor belt 1, a filter media support frame 2, and a rotary drive mechanism 3. Its mechanical structure is simple, and its manufacturing, installation, and maintenance are easy. The power required to drive the ring conveyor belt 1 is far lower than the large amount of heat energy required by thermal drying technology, and also lower than that of a high-speed centrifugal dewatering machine. It mainly relies on the filtration and adsorption capacity of the filter media itself, resulting in low energy consumption and significantly reduced operating costs.

[0040] In the above embodiments, the composite filter media filling layer is a carbon-based filter media loaded with magnesium oxide. Using a magnesium oxide-loaded carbon-based filter media as the composite filter media filling layer, the carbon-based material itself has a huge specific surface area, capable of simultaneously adsorbing organic matter and other impurities. The loaded magnesium oxide acts as an active site, efficiently reacting with phosphate ions in the water to form insoluble magnesium phosphate precipitates. This mechanism of enrichment followed by reaction possesses good phosphorus removal potential, thereby achieving highly efficient phosphorus removal through the synergistic effect of physical adsorption and chemical precipitation, reducing dependence on additional chemical agents and secondary pollution. The carbon-based material used in this embodiment is biochar, which is widely available and inexpensive. Specifically, the magnesium oxide-loaded carbon-based filter media has a multi-level pore structure including macropores, mesopores, and micropores, and its surface is alkaline.

[0041] In the above embodiments, the thickness of the composite filter media filling layer is 30-50 cm. This range ensures a sufficiently long hydraulic retention time and contact area to achieve excellent phosphorus removal while avoiding excessive load on the annular conveyor belt 1 or excessive system pressure loss due to an excessively thick filter layer, thus finding the optimal balance between filtration efficiency and operating energy consumption. Preferably, the thickness of the composite filter media filling layer is 40 cm.

[0042] In the above embodiment, the rotary drive mechanism 3 includes: two parallel rotating drums 31, two drive components (not shown in the figure), and a transmission mechanism. The two rotating drums 31 are located on the inner ring of the annular conveyor belt 1. The transmission mechanism is configured to transmit the power of each drive component to the corresponding rotating drum 31, thereby driving the two rotating drums 31 to rotate independently. In this embodiment, the drive motor drives the rotating drums 31 to rotate through the transmission components, thereby frictionally driving the annular conveyor belt 1 and all the filter media carrying frames 22 on it to move slowly. This design realizes "moving bed" filtration, allowing each composite filter media filling layer to periodically experience the working area and non-working area, avoiding the formation of permanent coatings of sludge particles on the filter media surface, fundamentally solving the filter media clogging problem, and reducing maintenance frequency and cost.

[0043] In one specific embodiment, the mechanism includes two rotating drums 31 arranged parallel to each other on the inner ring of the annular conveyor belt 1, rotating shafts 32 fixedly installed inside the two rotating drums 31, and drive motors 33 fixedly connected to the two rotating shafts 32 respectively to provide power. In another specific embodiment, the surfaces of the rotating drums that contact the annular conveyor belt 1 respectively include meshing gear and toothed belt structures. The rotation of the rotating shafts 32 driven by the drive motor drives the gears and toothed belts to mesh and transmit power, thereby realizing the cyclic rotation of the annular conveyor belt 1. The drive mechanism of the annular conveyor belt 1 can also be of other forms, and this utility model does not limit it.

[0044] According to another specific embodiment of this utility model, it further includes: a filtrate collection tank 4, used to receive the filtered liquid, and the filtrate collection tank 4 is located below the annular conveyor belt 1. The filtrate collection tank 4 effectively collects the liquid after preliminary filtration, facilitating the secondary utilization of the filtered liquid and improving the utilization rate of the liquid. Furthermore, the filtrate collection tank 4 is provided with a drainage channel to facilitate the discharge of the filtrate.

[0045] In the above embodiment, in order to further improve water quality, it also includes: a multi-layer filter screen (not shown in the figure), which is installed in the filtrate collection tank 4, and the multi-layer filter screen is arranged sequentially in the height direction of the filtrate collection tank 4.

[0046] In the above embodiment, the pore size of the filter screen near the bottom of the filtrate collection tank 4 is smaller than that of the filter screen farther away from the filtrate collection tank 4. This constitutes a built-in fine filtration system. The pore size gradually decreases from top to bottom, enabling the tiered interception of fine particles that penetrate the filter media layer, effectively improving the clarity of the final effluent and preventing fine suspended solids from re-entering the water body. In some embodiments, the pore size of the filter screen is 0.3mm-1.5mm. Further, the pore size of the filter screen is, for example, 1.5mm, 1mm, 0.5mm, or 0.3mm.

[0047] In the above embodiment, the system further includes: a filter cake collection box (not shown in the figure), located below the annular conveyor belt 1, having an opening facing the annular conveyor belt 1; and a filter cake conveying mechanism, installed in the filter cake collection box, for discharging filter cake. The filter cake collection box and the filter cake conveying mechanism together constitute an automated filter cake cleaning system. The detached filter cake is collected centrally and automatically discharged through the conveying mechanism, achieving continuous cleaning of solid waste, avoiding accumulation inside the water treatment filtration device, and ensuring the long-term stable operation of the system. The filter cake conveying mechanism can be a screw conveyor or other conveying mechanisms; this invention does not limit this.

[0048] In the above embodiments, a vibration mechanism (not shown in the figure) is also included, which is fixedly installed on the side of the annular conveyor belt 1. This mechanism is used to periodically or continuously vibrate the filter media carrying frame 2. The vibration mechanism (such as a vibration motor) can be activated when the filter media carrying frame 2 runs to a specific position (such as above the filter cake collection box). Through high-frequency vibration, it helps to shake off stubborn filter cakes attached to the surface and interior of the composite filter media filling layer, which greatly enhances the self-cleaning ability of the system and further ensures the durability of filtration efficiency. The number of vibration mechanisms can be one or more, and this utility model does not limit this. In some embodiments, the vibration mechanism includes a motor, an eccentric wheel, and a fixed bracket. The motor is fixed to the side of the annular conveyor belt 1; the eccentric wheel is connected to the output shaft of the motor. When the motor is working, the rotation of the eccentric wheel generates centrifugal force, thereby causing the annular conveyor belt 1 to vibrate; the motor is installed on the side of the annular conveyor belt 1 through the fixed bracket.

[0049] Secondly, embodiments of this utility model disclose a filtration system, including the aforementioned water treatment filtration device. The filtration system provided by this utility model uses a rotary drive mechanism 3 to drive an annular conveyor belt 1, causing the filter media support frame 2 and its internal composite filter media filling layer to circulate. Adhesive substances are less likely to form a permanent coating on the filter media surface, allowing for greater removal and eliminating the need for frequent shutdowns to replace or clean the filter media, significantly reducing maintenance costs and downtime. The composite filter media filling layer can efficiently remove phosphorus through physical adsorption, chemical precipitation, or biological processes (such as denitrification), reducing operating costs and avoiding the risk of secondary pollution caused by excessive reagent addition. The core components of this water treatment filtration device are only the annular conveyor belt 1, the filter media frame, and the drive mechanism; the mechanical structure is simple, and manufacturing, installation, and maintenance are easy.

[0050] The filtration system also includes a water distribution mechanism (not shown in the figure) for distributing sludge water to the water treatment filtration device. The structure of the water distribution mechanism can be based on existing technology, and this embodiment does not limit it.

[0051] In this embodiment, the dewatered sludge filtrate enters the filter media support frame 2 through the water flow distribution mechanism. During rotation, the filter media makes full contact with the water. Biochar adsorbs dissolved organic matter and some phosphates, while magnesium oxide reacts with phosphate ions to form Mg3(PO4)2 precipitate. Trace amounts of metal salts (FeCl3 and polyaluminum chloride) further enhance flocculation and sedimentation. The rotating design increases the dynamic contact area between the filter media and the water, preventing clogging and improving treatment efficiency. The treated water is discharged through the drainage channel 41, and the filter residue can be collected and discharged through the filter residue collection box. The filter media can be replaced periodically.

[0052] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A filtration device for water treatment, characterized in that, include: Circular conveyor belt; Multiple filter media support frames are fixedly installed on the annular conveyor belt, and the multiple filter media support frames are distributed at intervals in the circumferential direction of the annular conveyor belt. The filter media support frames have a hollow structure for liquid to flow out. The composite filter media filling layer is fixedly filled within each of the filter media support frames; A rotary drive mechanism is connected to the annular conveyor belt to drive the annular conveyor belt to rotate, thereby causing the filter media support frame to rotate with the annular conveyor belt.

2. The water treatment filtration device according to claim 1, characterized in that, The composite filter media filling layer is a carbon-based filter media loaded with magnesium oxide.

3. The water treatment filtration device according to claim 1, characterized in that, The thickness of the composite filter media filling layer is 30-50cm.

4. The water treatment filtration device according to claim 1, characterized in that, The rotary drive mechanism includes: Two parallel rotating drums are located on the inner ring of the annular conveyor belt; Two drive components; and The transmission mechanism is configured to transmit power from each of the driving elements to the corresponding rotating drums to drive the two rotating drums to rotate independently.

5. The water treatment filtration device according to claim 1, characterized in that, Also includes: A filtrate collection tank is used to collect the filtered liquid, and the filtrate collection tank is located below the annular conveyor belt.

6. The water treatment filtration device according to claim 5, characterized in that, Also includes: A multi-layer filter screen is installed inside the filtrate collection tank, with the multiple filter screens arranged sequentially along the height direction of the filtrate collection tank.

7. The water treatment filtration device according to claim 6, characterized in that, The pore size of the filter screen near the bottom of the filtrate collection tank is smaller than that of the filter screen farther away from the filtrate collection tank.

8. The water treatment filtration device according to claim 1, characterized in that, Also includes: A filter residue collection box is located below the annular conveyor belt and has an opening facing the annular conveyor belt; A filter residue conveying mechanism is installed in the filter residue collection box and is used to output filter residue.

9. The water treatment filtration device according to claim 1, characterized in that, Also includes: A vibration mechanism is fixedly installed on the side of the annular conveyor belt and is used to vibrate the filter media support frame.

10. A filtration system, characterized in that, The water treatment filtration device includes any one of claims 1 to 9.

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