Sludge phosphorus recovery system

Abstract

The utility model relates to the technical field of phosphorus recovery, in particular to a sludge phosphorus recovery system, which comprises a carriage stock bin, a washing tank, a sludge cavity, a filter cavity, a slurry outlet pipe, a filter piece, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe, a sludge discharge pipe and a sludge discharge pipe, wherein the bottom of the carriage stock bin is provided with a discharge port; the washing tank is provided with a liquid outlet pipe in the filtering cavity; the filter press is connected to the slurry outlet pipe through a feeding pump, and the filter press is provided with a liquid discharge pipe; the liquid inlet end of the phosphorus recovery pool is connected with a liquid discharge pipe and a liquid outlet pipe, and a filtrate pipe of the phosphorus recovery pool is connected to the washing tank and / or the carriage stock bin. According to the sludge filter pressing device, the sludge can be washed and replaced in the washing tank by using the clarified water in the phosphorus recovery pool, so that the washing frequency during the subsequent sludge filter pressing is reduced, and the problems in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of phosphorus recovery, in particular to a sludge phosphorus recovery system. Background Art

[0002] Sludge is often rich in phosphorus-containing substances, and phosphorus recovery in sludge is an important part of sludge treatment. For phosphorus recovery in sludge, anaerobic digestion, water-soluble replacement and other treatment methods are often used to convert the phosphorus in the sludge into a free state soluble in water, and then the phosphorus-containing substances are crystallized and precipitated by adding reagents to the phosphorus recovery tank to react with struvite, so as to achieve the purpose of phosphorus recovery.

[0003] At present, in order to replace the soluble phosphorus in the sludge with water, the filtration and washing are repeatedly switched in the filter press to reduce the phosphorus content in the sludge after filtration. In this way, the filter press takes a long time to repeatedly filter, consumes a lot of energy, and occupies a long time of the filter press.

[0004] Therefore, there is an urgent need to improve the existing water-soluble replacement technology in sludge phosphorus recovery treatment. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a sludge phosphorus recovery system, which can use clarified water from the phosphorus recovery tank to wash and replace the sludge in the washing tank, so as to reduce the number of subsequent washing times during the sludge filter pressing, and effectively solve the problems existing in the prior art.

[0006] In order to solve the above problems, the utility model provides a sludge phosphorus recovery system, including: a slide silo, a discharge port is provided at the bottom of the slide silo; a water washing tank, the water washing tank has a sludge chamber and a filter chamber, the water washing tank is connected to the discharge port at the sludge chamber, a slurry discharge pipe is provided at the bottom of the sludge chamber, a filter element is provided between the sludge chamber and the filter chamber, and the water washing tank is provided with a liquid discharge pipe in the filter chamber; a filter press, the filter press is connected to the slurry discharge pipe through a feed pump, and the filter press has a liquid discharge pipe; a phosphorus recovery tank, the liquid inlet end of the phosphorus recovery tank is connected to the liquid discharge pipe and the liquid discharge pipe, and the filtrate pipe of the phosphorus recovery tank is connected to the water washing tank and / or the slide silo.

[0007] Furthermore, the upper portion of the slide silo is connected to the filtrate tube.

[0008] Furthermore, two discharge ports are provided at the bottom of the slide silo, and the two discharge ports are respectively provided with the water washing tank.

[0009] Furthermore, the filtrate pipe is connected to a water pipe, the water pipe is provided with a regulating valve, and the filtrate pipe is provided with a pH detection component on a side of the water pipe away from the phosphorus recovery tank.

[0010] Furthermore, the filtrate pipe is connected to the slide silo and the water washing tank respectively through a plurality of branch pipes, and each branch pipe is provided with a water valve.

[0011] Furthermore, the water washing tank is provided with a stirring element in the sludge chamber.

[0012] Furthermore, the washing tank comprises an outer shell and an inner cylinder, the sludge chamber is formed inside the inner cylinder, the filter chamber is formed between the outer shell and the inner cylinder, and the filter element is provided in the inner cylinder.

[0013] Furthermore, a stirring element is provided inside the inner cylinder.

[0014] Furthermore, the inner cylinder is evenly distributed with filter holes, and a filter cloth is attached to the surface of the inner cylinder.

[0015] Furthermore, a support frame is provided at the bottom of the slide silo, and the support frame forms a space for accommodating the water washing tank at the lower side of the slide silo.

[0016] The beneficial effect of the utility model is that the clarified water of the phosphorus recovery tank can be used to wash and replace the sludge in the washing tank, so as to reduce the number of subsequent washing times during the sludge filter pressing, and effectively solve the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0019] Among them: 1. Water washing tank; 2. Slide silo; 3. Sludge chamber; 4. Filter chamber; 5. Slurry outlet pipe; 6. Liquid outlet pipe; 7. Filter press; 8. Liquid discharge pipe; 9. Phosphorus recovery tank; 10. Liquid inlet end; 11. Filtrate pipe; 12. Tap water pipe; 13. Regulating valve; 14. pH detection element; 15. Delivery pump; 16. Agitator; 17. Outer shell; 18. Inner cylinder; 19. Support frame; 20. Branch pipe; 21. Water valve. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0021] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0022] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are connected to form a whole only through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0024] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0025] In the present utility model, if Figure 1As shown, a sludge phosphorus recovery system is provided, including: a slide silo 2, a discharge port is provided at the bottom of the slide silo 2; a water washing tank 1, the water washing tank 1 has a sludge chamber 3 and a filter chamber 4, the water washing tank 1 is connected to the discharge port at the sludge chamber 3, a slurry discharge pipe 5 is provided at the bottom of the sludge chamber 3, a filter element is provided between the sludge chamber 3 and the filter chamber 4, and the water washing tank 1 is provided with a liquid discharge pipe 6 at the filter chamber 4; a filter press 7, the filter press 7 is connected to the slurry discharge pipe 5 through a feed pump, and the filter press 7 has a liquid discharge pipe 8; a phosphorus recovery tank 9, a liquid inlet end 10 of the phosphorus recovery tank 9 is connected to the liquid discharge pipe 8 and the liquid discharge pipe 6, and a filtrate pipe 11 of the phosphorus recovery tank 9 is connected to the water washing tank 1 and / or the slide silo 2.

[0026] When the phosphorus recovery system of the utility model is used, the sludge to be treated is discharged from the discharge port of the carriage silo 2 into the sludge chamber 3 of the washing tank 1, and the filtrate is introduced into the washing tank 1 through the filtrate pipe 11, so that the sludge in the washing tank 1 forms slurry, and the soluble phosphorus-containing substances in the sludge enter the water. Then, water is introduced into the liquid inlet end 10 of the phosphorus recovery tank 9 through the liquid outlet pipe 6 to recover the soluble phosphorus-containing substances in the phosphorus recovery tank 9. After the sludge in the washing tank 1 is washed and replaced by water, the sludge in the washing tank 1 is discharged from the slurry outlet pipe 5 into the filter press 7 for pressure filtration, and the water squeezed out by the pressure filtration is introduced into the phosphorus recovery tank 9 through the liquid discharge pipe 8 for phosphorus recovery. After the liquid in the phosphorus recovery tank 9 is recovered by phosphorus, the upper clarified water is introduced into the washing tank 1 or the carriage silo 2 again through the filtrate pipe 11 to wash and replace the soluble phosphorus-containing substances in the washing tank 1.

[0027] The utility model has the following beneficial effects through the above process:

[0028] Firstly, the utility model improves the fluidity of the sludge in the water washing tank 1 by passing water in the slide silo 2 and / or the water washing tank 1 , so as to facilitate the transportation of the sludge from the water washing tank 1 to the filter press 7 .

[0029] Secondly, the utility model can reduce the amount of water used for washing sludge by recycling the water in the phosphorus recovery tank 9. Moreover, the water entering the washing tank 1 from the phosphorus recovery tank 9 contains some reagents, so that some reagents remain in the water flowing back from the washing tank 1 to the phosphorus recovery tank 9, and the amount of reagents used in the phosphorus recovery tank 9 can be reduced. When the pH value of the water flowing out of the filtrate pipe 11 from the phosphorus recovery tank 9 is too high, the pH value (below 7) of the filtrate pipe 11 entering the washing tank 1 or the slide silo 2 can be lowered by connecting the tap water pipe 12 to the filtrate pipe 11, so as to inhibit the struvite reaction of the soluble phosphorus-containing substances in the washing tank 1. After the water in the washing tank 1 flows back to the phosphorus recovery tank 9, the pH value in the phosphorus recovery tank 9 can be adjusted to the optimal range of the struvite reaction (7.5-8) to promote the struvite crystallization reaction.

[0030] Thirdly, the utility model reduces the content of soluble phosphorus in free water and bound water in the sludge by washing and replacing the soluble phosphorus in the washing tank 1, so that the number of filtration and washing at the filter press 7 can be reduced during the filtration process of the filter press 7. The filtration processing time is reduced, the time occupied by the filter press 7 for a single sludge treatment is reduced, and the processing efficiency of the filter press 7 is improved.

[0031] In the illustrated embodiment, a further optimized setting is that the upper part of the carriage silo 2 is connected to the filtrate pipe 11. As shown in the figure, by increasing the amount of sludge in the carriage silo 2, the fluidity of the sludge in the carriage silo 2 is promoted, and the dissolution and replacement time of soluble phosphorus in the sludge in the water is increased.

[0032] In the illustrated embodiment, a further optimized arrangement is that two discharge ports are provided at the bottom of the slide silo 2, and the two discharge ports are respectively provided with the water washing tank 1.

[0033] As shown in the figure, the sludge can be discharged outwardly by alternately washing with water through two washing tanks 1, so as to shorten the interval time of sludge washing and replacement and discharge of sludge outwardly, and improve the efficiency of water washing and replacement.

[0034] In the illustrated embodiment, a further optimized arrangement of the utility model is that the filtrate pipe 11 is connected to a tap water pipe 12 , the tap water pipe 12 is provided with a regulating valve 13 , and the filtrate pipe 11 is provided with a pH detection component 14 on the side of the tap water pipe 12 away from the phosphorus recovery tank 9 .

[0035] As shown in the figure, the tap water pipe 12 is connected to the sludge washing tank 1. The sludge in the washing tank 1 can be replaced by tap water. When the pH value of the liquid flowing out of the filtrate pipe 11 of the phosphorus recovery tank 9 is too high, the pH value of the water entering the slide silo 2 and the washing tank 1 can be lowered by mixing tap water to inhibit the struvite reaction.

[0036] The pH detection element 14 is provided to monitor the pH value of the water flowing from the filtrate pipe 11 to the slide silo 2 and the washing tank 1. According to the detected value, the regulating valve 13 is controlled to control the amount of tap water input.

[0037] In the illustrated embodiment, a further optimized configuration is that the liquid outlet pipe 6 is provided with a delivery pump 15. As shown in the figure, the delivery pump 15 is provided to increase the ability of the liquid outlet pipe 6 to pump liquid outward, so that water can be quickly discharged toward the phosphorus recovery tank 9.

[0038] In the illustrated embodiment, with regard to the structure of the water washing tank 1, more specifically, as shown in the figure, the water washing tank 1 includes an outer shell 17 and an inner cylinder 18, the sludge chamber 3 is formed inside the inner cylinder 18, the filter chamber 4 is formed between the outer shell 17 and the inner cylinder 18, and the inner cylinder 18 is provided with the filter element.

[0039] In the illustrated embodiment, a further optimized configuration of the utility model is that the washing tank 1 is provided with a stirring member 16 in the sludge chamber 3 .

[0040] By providing a stirring element 16 to stir the sludge in the washing tank 1, the dissolution efficiency of soluble phosphorus-containing substances in the sludge can be improved, and the flow of sludge in the mud chamber can be promoted, so that the sludge flows more smoothly when the sludge is discharged to the slurry outlet pipe 5 and the sludge in the slurry outlet pipe 5 enters the filter press 7.

[0041] The stirring element 16 preferably includes a vertical stirring rod, fins arranged on the stirring rod, and a motor arranged at the bottom of the housing 17 as shown in the figure, and the motor drives the stirring rod to rotate.

[0042] In a preferred embodiment, the inner cylinder 18 is provided with a filter element. Specifically, the inner cylinder 18 is evenly distributed with filter holes, and a filter cloth is attached to the surface of the inner cylinder 18. In this way, a hard inner cylinder 18 such as metal can be used as a support, and the sludge in the mud chamber can be finely filtered through the filter cloth.

[0043] Regarding the form of setting the filter element in the inner cylinder 18 , in an optional embodiment, a hard inner cylinder 18 can also be directly used, and fine filter holes can be processed in the inner cylinder 18 .

[0044] In the illustrated embodiment, a further optimized arrangement is that a support frame 19 is provided at the bottom of the carriage silo 2, and the support frame 19 forms a space for accommodating the water washing tank 1 at the lower side of the carriage silo 2. As shown in the figure, the water washing tank 1 can be placed in the space at the lower side of the carriage silo 2, and the carriage silo 2 can discharge materials downward by gravity.

[0045] It should be noted that the improvement of the present invention lies in the optimized design of the waterway of the entire phosphorus recovery system, and no restrictions or improvements are made to the internal structures of the filter press 7, the slide silo 2, and the phosphorus recovery tank 9. Those skilled in the art can flexibly select products in the prior art when implementing the present invention. No further details will be given here.

[0046] In the illustrated embodiment, the connection between the liquid outlet pipe 6 and the filtrate pipe 11 is further specifically described as follows: the filtrate pipe 11 is connected to the carriage silo 2 and the water washing tank 1 through a plurality of branch pipes 20, and each branch pipe 20 is provided with a water valve 21. As shown in the figure, the liquid outlet pipe 6 is connected to the bottom side of the water washing tank 1, and the liquid outlet pipe 6 extends upward and then bends and extends horizontally and is connected to the phosphorus recovery tank 9. The filtrate pipe 11 of the phosphorus recovery tank 9 is connected to the carriage silo 2 and the water washing tank 1 through a plurality of branch pipes 20, and the branch pipe 20 is connected to the top mud chamber of the water washing tank 1. The water valve 21 provided on the branch pipe 20 can control the water flow into the carriage silo 2 and the water washing tank 1.

[0047] The above connection mode is not a limitation of the connection mode between the branch pipe 20 and the water washing tank 1. In an optional embodiment, the branch pipe 20 can also be connected to the filter chamber 4. Alternatively, the branch pipe 20 is connected to the liquid outlet pipe 6. Based on this, in the present invention, the connection of the filtrate pipe 11 to the water washing tank 1 includes the connection of the filtrate pipe 11 directly to the mud chamber or the filter chamber 4 of the water washing tank 1, and the connection of the filtrate pipe 11 indirectly to the mud chamber or the filter chamber 4 of the water washing tank 1 through other connecting devices.

[0048] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0049] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A sludge phosphorus recovery system, characterized in that: include: The slide silo has a discharge port at the bottom: A water washing tank, wherein the water washing tank has a sludge chamber and a filter chamber, the sludge chamber of the water washing tank is connected to the discharge port, a slurry discharge pipe is provided at the bottom of the sludge chamber, a filter element is provided between the sludge chamber and the filter chamber, and the water washing tank is provided with a liquid discharge pipe in the filter chamber; A filter press, the filter press is connected to the slurry discharge pipe through a feed pump, and the filter press has a liquid discharge pipe; A phosphorus recovery tank, wherein the liquid inlet end of the phosphorus recovery tank is connected to the liquid discharge pipe and the liquid outlet pipe, and the filtrate pipe of the phosphorus recovery tank is connected to the water washing tank and / or the slide silo.

2. The sludge phosphorus recovery system according to claim 1, characterized in that: The upper part of the sliding frame silo is connected to the filtrate pipe.

3. The sludge phosphorus recovery system according to claim 1, characterized in that: The bottom of the slide silo is provided with two discharge ports, and the two discharge ports are respectively provided with the water washing tank.

4. The sludge phosphorus recovery system according to claim 1, characterized in that: The filtrate pipe is connected to a tap water pipe, the tap water pipe is provided with a regulating valve, and the filtrate pipe is provided with a pH detection component on a side of the tap water pipe away from the phosphorus recovery tank.

5. The sludge phosphorus recovery system according to claim 2, characterized in that: The filtrate pipe is connected to the slide silo and the water washing tank respectively through a plurality of branch pipes, and each branch pipe is provided with a water valve.

6. The sludge phosphorus recovery system according to claim 1, characterized in that: The water washing tank is provided with a stirring member in the sludge chamber.

7. The sludge phosphorus recovery system according to claim 1, characterized in that: The washing tank comprises an outer shell and an inner cylinder, the sludge cavity is formed inside the inner cylinder, the filter cavity is formed between the outer shell and the inner cylinder, and the filter element is provided on the inner cylinder.

8. The sludge phosphorus recovery system according to claim 7, characterized in that: A stirring element is arranged inside the inner cylinder.

9. The sludge phosphorus recovery system according to claim 7, characterized in that: The inner cylinder is evenly distributed with filter holes, and the surface of the inner cylinder is covered with filter cloth.

10. The sludge phosphorus recovery system according to claim 1, characterized in that: A support frame is provided at the bottom of the slide silo, and the support frame forms a space for accommodating the water washing tank at the lower side of the slide silo.

Images