A polylactic acid denitrification solid carbon source feeding device

Abstract

This invention discloses a solid carbon source addition device for polylactic acid denitrification, comprising a wastewater tank, an inlet pipe connected to the top of the wastewater tank, a drain pipe connected to the side wall of the wastewater tank, a feed hopper on the wastewater tank, a carbon source storage mechanism on the wastewater tank, and the carbon source storage mechanism covering the feed hopper, with a feed pipe connected to the feed hopper. The carbon source storage mechanism transfers carbon source into the carbon source storage mechanism through the feed pipe. A carbon source dispensing mechanism is provided inside the wastewater tank. The carbon source storage mechanism is equipped with a drive motor and a power transmission mechanism, with the drive motor connected to the input end of the power transmission mechanism. The power transmission mechanism has a forward output end and a reverse output end. The advantages are: this invention achieves precise carbon source release through spiral conveying and layered dispensing, improving denitrification efficiency; the directional cylinder dynamically adjusts the dispensing position, optimizing the carbon source distribution in the wastewater; the single-motor dual-function drive saves energy; and the structure is compact.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, and in particular to a polylactic acid denitrification solid carbon source dosing device. Background Technology

[0002] In wastewater denitrification processes, denitrification is a crucial step in removing nitrate nitrogen from water. This process relies on the metabolic activities of heterotrophic microorganisms, and a sufficient and suitable carbon source is the core condition for ensuring microbial activity and denitrification efficiency. Traditional wastewater treatment often uses liquid carbon sources such as methanol and acetic acid. While these provide carbon source support for denitrification, they have significant drawbacks: the dosage of liquid carbon sources needs precise control; excessive dosage can easily lead to excessive COD in the effluent, causing secondary pollution, while insufficient dosage will result in incomplete denitrification. Furthermore, liquid carbon sources are highly volatile, have high storage and transportation costs, and are not economically viable in the long term. With increasingly stringent environmental protection requirements, solid carbon sources are gradually replacing liquid carbon sources due to their excellent slow-release performance and strong controllability. Among them, polylactic acid (PLA) biodegradable materials, as a novel solid carbon source, have advantages such as wide availability, degradation rates adapted to denitrification cycles, and no secondary pollution, making them a research hotspot.

[0003] However, existing solid carbon source dosing devices have poor uniformity in carbon source dosing in practical applications. Traditional devices often use a single feeding port or a fixed conveying structure, which can easily lead to local accumulation of carbon source in the wastewater tank, resulting in uneven distribution of microorganisms and affecting the efficiency of denitrification reaction. At the same time, the power system is complex, and most devices need to be equipped with separate power sources for carbon source conveying and position adjustment, which not only consumes a lot of energy but also increases the size of the equipment and the difficulty of maintenance.

[0004] To address these issues, we propose a polylactic acid denitrification solid carbon source dosing device. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art by proposing a polylactic acid denitrification solid carbon source dosing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A polylactic acid denitrification solid carbon source dosing device includes a wastewater tank. The top of the wastewater tank is connected to an inlet pipe, and the side wall of the wastewater tank is connected to a drain pipe. A feeding hopper is provided on the wastewater tank, and a carbon source storage mechanism is provided on the wastewater tank, covering the feeding hopper. A feeding pipe is connected to the feeding hopper, and the carbon source storage mechanism transmits carbon source into the carbon source storage mechanism through the feeding pipe. A carbon source dispensing mechanism is provided inside the wastewater tank. The carbon source storage mechanism is equipped with a drive motor and a power transmission mechanism, and the drive motor is connected to the input end of the power transmission mechanism. The power transmission mechanism has a forward output end and a reverse output end. The power transmission mechanism drives the carbon source dispensing mechanism to dispense carbon source into the wastewater tank through the forward output end, and the reverse output end of the power transmission mechanism drives an adjustment mechanism to adjust the dispensing position of the carbon source in the wastewater tank.

[0008] In the above-mentioned polylactic acid denitrification solid carbon source addition device, the carbon source storage mechanism includes a protective box, the protective box includes a feeding chamber and a gear chamber, the feeding hopper is located in the feeding chamber, and the feeding pipe passes through the protective box and extends outward, and the power transmission mechanism is located in the gear chamber.

[0009] In the aforementioned polylactic acid denitrification solid carbon source addition device, the carbon source addition mechanism includes an inclined conveying cylinder, which is connected to the feed hopper via a bend. The inclined conveying cylinder is inclinedly installed inside the sewage tank. A conveying base elongated hole is provided on the side wall of the inclined conveying cylinder, and the conveying base elongated hole is located on the side facing the bottom wall of the sewage tank. The positive output end of the power transmission mechanism is provided with a vertical drive shaft. The lower end of the vertical drive shaft extends into the bend and is connected to the inclined drive shaft via a universal joint. A spiral conveying rod is provided on the inclined drive shaft, and the spiral conveying rod is located inside the inclined conveying cylinder.

[0010] In the above-mentioned polylactic acid denitrification solid carbon source dosing device, the inner bottom wall of the sewage tank is provided with an inclined base, and a directional cylinder is provided on the inclined base through a rotating shaft. The directional cylinder is located outside the inclined conveying cylinder, and the inner side wall of the directional cylinder is in contact with the outer side wall of the inclined conveying cylinder. The directional cylinder is provided with several feeding holes along the circumference.

[0011] In the above-mentioned polylactic acid denitrification solid carbon source addition device, the power transmission mechanism includes a central shaft, which is set on the output end of the drive motor. The central shaft is provided with a forward transmission gear and a reverse transmission gear. The vertical transmission shaft is provided with a forward driven gear through a first one-way bearing, and the forward driven gear meshes with the forward transmission gear.

[0012] In the above-mentioned polylactic acid denitrification solid carbon source addition device, a mounting shaft is vertically arranged in the gear cavity, and a reverse driven gear is provided on the mounting shaft through a second one-way bearing, and the reverse driven gear meshes with the reverse transmission gear.

[0013] In the aforementioned polylactic acid denitrification solid carbon source dosing device, the drive adjustment mechanism includes a horizontal shaft installed on the inner wall of the gear cavity, a first bevel gear and a partial bevel gear on the horizontal shaft, a second bevel gear on the mounting shaft and the second bevel gear meshing with the first bevel gear, an adjusting bevel gear sleeved on the adjusting cylinder, and a meshing hole on the sewage tank, wherein the partial bevel gear meshes with the adjusting bevel gear through the meshing hole.

[0014] In the above-mentioned polylactic acid denitrification solid carbon source addition device, the width of the adjusting cylinder is not less than the width of the feeding hole, and the height of the feeding hole decreases along the axis of the adjusting cylinder.

[0015] Compared with existing technologies, the beneficial effects of the present invention are as follows:

[0016] 1. Precise and controllable carbon source addition improves denitrification efficiency. The spiral conveying rod inside the inclined conveying cylinder, combined with the long holes of the conveying base, enables directional delivery and quantitative release of carbon source, avoiding the problems of carbon source accumulation or uneven distribution in traditional addition methods. At the same time, the feeding holes with decreasing heights on the inclined cylinder can adjust the amount of carbon source added according to the needs, ensuring that the carbon source concentration in the wastewater is suitable for the denitrification reaction and improving nitrogen removal efficiency.

[0017] 2. Dynamic adjustment of the feeding position optimizes the distribution of carbon sources. By using the drive motor to drive the reverse output end of the power transmission mechanism, the adjustment cylinder is driven to rotate through the meshing of the incomplete bevel gear and the adjustment bevel gear. This causes the relative position of the feeding hole and the conveying base long hole to change dynamically, so as to achieve uniform feeding of carbon sources in different areas of the sewage tank, avoid local carbon source excess or deficiency, and improve the uniformity of sewage treatment.

[0018] 3. Single power source dual-function drive, energy saving and compact structure. The drive motor uses the forward and reverse transmission gears of the power transmission mechanism to cooperate with the one-way bearing to realize the independent drive of the carbon source delivery mechanism and the drive adjustment mechanism. No additional power source is required, which simplifies the equipment structure, reduces energy consumption and improves the economic efficiency of operation.

[0019] 4. The carbon source storage and transportation are integrated to ensure the stability of the addition. The protective box of the carbon source storage mechanism is equipped with a feeding hopper, and the polylactic acid solid carbon source is stably supplied through the feeding pipe to avoid the carbon source getting damp or contaminated. The annular sealing gasket and annular sealing groove of the inclined conveying cylinder and the directional cylinder are matched to prevent sewage backflow or carbon source leakage, ensuring a stable and reliable addition process.

[0020] 5. The structural design is highly adaptable and easy to operate and maintain. The inclined base, universal joint and other structures are adapted to the complex environment inside the sewage tank, reducing installation restrictions. The gear transmission and screw conveyor structure is simple, easy to disassemble and repair, reducing equipment maintenance costs. The design of decreasing feed hole height can adapt to carbon sources of different particle sizes, improving the versatility of the device.

[0021] In summary, this invention achieves precise carbon source release through spiral conveying and stratified feeding, thereby improving denitrification efficiency. The directional cylinder dynamically adjusts the feeding position to optimize the distribution of carbon sources in wastewater. The single-motor dual-function drive saves energy and has a compact structure. Attached Figure Description

[0022] Figure 1 This is a visual diagram of a polylactic acid denitration solid carbon source addition device proposed in this invention;

[0023] Figure 2 This is a cross-sectional view of a polylactic acid denitration solid carbon source dosing device proposed in this invention;

[0024] Figure 3 This is a cross-sectional structural diagram of the wastewater tank and the protective tank in a polylactic acid denitrification solid carbon source dosing device proposed in this invention;

[0025] Figure 4 This is a cross-sectional structural diagram of the wastewater tank, protective tank, inclined conveying cylinder, and adjusting cylinder in a polylactic acid denitrification solid carbon source dosing device proposed in this invention.

[0026] Figure 5 This is a schematic diagram of the protective box and its internal structure in a polylactic acid denitrification solid carbon source dosing device proposed in this invention;

[0027] Figure 6 This is a partial cross-sectional view of the inclined conveyor cylinder in a polylactic acid denitrification solid carbon source dosing device proposed in this invention;

[0028] Figure 7 This is an enlarged view of the screw conveyor section of a polylactic acid denitrification solid carbon source dosing device proposed in this invention;

[0029] Figure 8 This is a schematic diagram of the inclined conveying cylinder part in the polylactic acid denitration solid carbon source addition device proposed in this invention;

[0030] Figure 9 This is a schematic diagram of the drive and adjustment mechanism in a polylactic acid denitration solid carbon source dosing device proposed in this invention;

[0031] Figure 10 This is a schematic diagram of the directional cylinder in a polylactic acid denitrification solid carbon source dosing device proposed in this invention.

[0032] In the diagram: 1. Sewage tank; 2. Inlet pipe; 3. Drain pipe; 4. Feed pipe; 5. Feed hopper; 6. Protective box; 601. Feeding chamber; 602. Gear chamber; 7. Drive motor; 8. Inclined conveyor cylinder; 9. Conveying base elongated hole; 10. Vertical drive shaft; 11. Universal joint; 12. Inclined drive shaft; 13. Screw conveyor rod; 14. Inclined base; 15. Adjusting cylinder; 16. Feeding hole; 17. Central shaft; 18. Forward drive gear; 19. Reverse drive gear; 20. Forward driven gear; 21. Mounting shaft; 22. Reverse driven gear; 23. First bevel gear; 24. Incomplete bevel gear; 25. Second bevel gear; 26. Adjusting bevel gear; 27. Annular sealing groove; 28. Annular sealing gasket. Detailed Implementation

[0033] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0034] Example

[0035] Reference Figure 1-10 A polylactic acid denitrification solid carbon source dosing device includes a wastewater tank 1, with an inlet pipe 2 connected to the top of the wastewater tank 1 and a drain pipe 3 connected to the side wall of the wastewater tank 1. The wastewater tank 1 is equipped with a feed hopper 5 and a carbon source storage mechanism, which is covered by the feed hopper 5. The feed hopper 5 is connected to a feed pipe 4. The carbon source storage mechanism transmits carbon source into the carbon source storage mechanism through the feed pipe 4. The carbon source storage mechanism includes a protective box 6, which includes a feed chamber 601 and a gear chamber 602. The feed hopper 5 is located in the feed chamber 601, and the feed pipe 4 passes through the protective box 6 and extends outward. The power transmission mechanism is located in the gear chamber 602.

[0036] The wastewater tank 1 is equipped with a carbon source dispensing mechanism, which includes an inclined conveying cylinder 8. The inclined conveying cylinder 8 is connected to the feed hopper 5 via a bend in the pipe and is inclinedly positioned inside the wastewater tank 1. A conveying base elongated hole 9 is provided on the side wall of the inclined conveying cylinder 8, facing the bottom wall of the wastewater tank 1. A vertical drive shaft 10 is provided at the forward output end of the power transmission mechanism. The lower end of the vertical drive shaft 10 extends into the bend and is connected to an inclined drive shaft 12 via a universal joint 11. A spiral conveying rod 13 is provided on the inclined drive shaft 12, and the spiral conveying rod 13 is located inside the inclined conveying cylinder 8. The bottom of the wastewater tank 1... The wall is equipped with an inclined base 14, on which a directional cylinder 15 is mounted via a rotating shaft. The directional cylinder 15 is located outside the inclined conveying cylinder 8, and its inner wall is in contact with the outer wall of the inclined conveying cylinder 8. Several annular sealing grooves 27 are formed on the outer wall of the inclined conveying cylinder 8, and an annular sealing gasket 28 is provided on the inner wall of the directional cylinder 15. The annular sealing gasket 28 is located in the corresponding annular sealing groove 27. The annular sealing gasket 28 is made of nitrile rubber that is resistant to sewage corrosion, and its cross-section is designed as a stepped shape. It can compensate for wear after long-term use through pre-compression, ensuring that the carbon source is accurately fed only from the feeding hole 16 and avoiding leakage from the gap. To prevent waste caused by leakage, the adjusting cylinder 15 is provided with several feeding holes 16 along its circumference. The width of the adjusting cylinder 15 is not less than the width of the feeding holes 16. The height of the feeding holes 16 decreases along the axial direction of the adjusting cylinder 15. Several feeding holes 16 are evenly distributed along the circumference of the adjusting cylinder 15, and the vertical opening size of each feeding hole 16 is consistent. The opening height of the feeding holes 16 changes in a gradient along the axial direction of the adjusting cylinder 15, that is, from the high end to the low end of the adjusting cylinder 15, the vertical position of the feeding holes 16 on the cylinder wall gradually decreases, forming a height distribution gradient along the axial direction. The high-end feeding holes 16 can feed carbon sources into the upper part of the wastewater tank 1, while the low-end feeding holes can feed carbon sources into the upper part of the wastewater tank 1. The feed hole 16 corresponds to the middle and lower area, which can accurately match the denitrification reaction requirements at different water depths. The carbon source particles in the inclined conveying cylinder 8 move along the inclined path and gradually move towards the lower end under the action of the screw conveyor. The design of the feed hole 16 with the lowering of the axis of the adjusting cylinder 15 is highly consistent with the natural conveying trajectory of the material, which can reduce the residence time of carbon source particles in the cylinder. When the carbon source moves to different positions, the feed hole 16 at the corresponding height can promptly discharge it, making the feeding process smoother and reducing the risk of blockage. Operators can select feed holes 16 at different heights by rotating the adjusting cylinder 15 to achieve rapid vertical switching of carbon source feeding points.

[0037] The annular sealing groove 27 is set between two adjacent feeding holes 16. The feeding hole 16 area needs to keep the channel unobstructed. If the annular sealing groove 27 overlaps with the feeding hole 16, the annular sealing gasket 28 will be partially embedded in the feeding hole 16, causing the carbon source to be obstructed or the seal to wear abnormally.

[0038] The carbon source storage mechanism is equipped with a drive motor 7 and a power transmission mechanism. The drive motor 7 is connected to the input end of the power transmission mechanism. The power transmission mechanism has a forward output end and a reverse output end. The power transmission mechanism drives the carbon source dispensing mechanism to dispense carbon source into the sewage tank 1 through the forward output end. The reverse output end of the power transmission mechanism drives the adjustment mechanism to adjust the dispensing position of the carbon source in the sewage tank 1. The power transmission mechanism includes a central shaft 17, which is set on the output end of the drive motor 7. The central shaft 17 is equipped with a forward transmission gear 18 and a reverse transmission gear 19. A forward driven gear 20 is provided on the vertical transmission shaft 10 through a first one-way bearing, and the forward driven gear 20 meshes with the forward transmission gear 18. A mounting shaft 21 is vertically arranged in the gear cavity 602. A reverse driven gear 22 is provided on the mounting shaft 21 through a second one-way bearing, and the reverse driven gear 22 meshes with the reverse transmission gear 19.

[0039] The drive adjustment mechanism includes a horizontal shaft mounted on the inner wall of the gear cavity 602, a first bevel gear 23 and a partial bevel gear 24 mounted on the horizontal shaft, a second bevel gear 25 mounted on the mounting shaft 21, and the second bevel gear 25 meshing with the first bevel gear 23. A directional bevel gear 26 is sleeved on the directional cylinder 15. A meshing hole is provided on the sewage tank 1, and the partial bevel gear 24 meshes with the directional bevel gear 26 through the meshing hole. A sealing plate is inclinedly arranged inside the sewage tank 1. The directional bevel gear 26, the meshing hole, and part of the partial bevel gear are also included. All 24 are positioned above the sealing plate, while the inclined conveying cylinder 8 and the directional cylinder 15 are positioned below the sealing plate. The sealing plate divides the interior of the sewage tank 1 into two independent areas: dry and wet. The inclined conveying cylinder 8 and the directional cylinder 15 below the sealing plate are in direct contact with the sewage environment, while the directional bevel gear 26, the meshing hole, and part of the incomplete bevel gear 24 above the sealing plate are in a dry state. This layout can completely block the erosion of the gear transmission mechanism by sewage, water vapor, and corrosive substances, and avoid problems such as gear jamming or reduced transmission accuracy due to rust and scaling.

[0040] Assuming the number of feed holes 16 is n, then the angle of the distribution of the incomplete bevel gears 24 is: When the drive motor 7 rotates in reverse, the incomplete bevel gear 24 can drive the adjusting bevel gear 26 to complete one station switch for each rotation of the corresponding angle, so that the feeding holes 16 at different heights are accurately aligned with the conveying base hole 9, and the positioning adjustment of the feeding position is realized.

[0041] The core power source of the device is the drive motor 7, which realizes the bidirectional function of forward driving carbon source delivery and reverse driving position adjustment through the power transmission mechanism. Specifically, the power switching is achieved through gear meshing and the cooperation of one-way bearings.

[0042] Forward drive state: When the drive motor 7 rotates in the forward direction, the output end drives the central shaft 17 to rotate. The forward transmission gear 18 on the central shaft 17 meshes with the forward driven gear 20 (installed through the first one-way bearing) on ​​the vertical transmission shaft 10. At this time, the first one-way bearing is in a locked state. The power is transmitted to the carbon source feeding mechanism through the vertical transmission shaft 10, driving the screw conveyor 13 to work. At the same time, although the reverse transmission gear 19 rotates with the central shaft 17, the reverse driven gear 22 is installed on the mounting shaft 21 through the second one-way bearing. At this time, the second one-way bearing is in an idle state. The reverse transmission path does not transmit power, and the drive adjustment mechanism does not work.

[0043] Reverse drive state: When the drive motor 7 rotates in reverse, the reverse transmission gear 19 on the central shaft 17 meshes with the reverse driven gear 22 on the mounting shaft 21 (the second one-way bearing is locked at this time), and the power is transmitted to the mounting shaft 21. At this time, in the meshing path of the forward transmission gear 18 and the forward driven gear 20, the first one-way bearing rotates freely, the carbon source delivery mechanism stops working, and all the power is used to drive the adjustment mechanism.

[0044] In the forward drive state, the device accurately delivers polylactic acid solid carbon source into the sewage tank 1 through inclined conveying, spiral pushing and multi-layer dispersion structure. The polylactic acid solid carbon source enters the feeding chamber 601 of the carbon source storage mechanism through the feeding pipe 4 and is temporarily stored in the feeding hopper 5. When the drive motor 7 rotates in the forward direction, the vertical transmission shaft 10 drives the inclined transmission shaft 12 to rotate through the universal joint 11. The spiral conveying rod 13 on the inclined transmission shaft 12 rotates in the inclined conveying cylinder 8, pushing the carbon source in the feeding hopper 5 upward along the inclined direction. After being pushed to the inclined conveying cylinder 8 by the spiral conveying rod 13, the carbon source is output into the sewage tank 1 through the conveying base elongated hole 9 on the side wall and the corresponding feeding hole 16.

[0045] In reverse drive mode, the device drives the adjusting cylinder 15 to rotate through bevel gear meshing, thereby achieving circumferential adjustment of the carbon source placement position. When the drive motor 7 rotates in reverse, the mounting shaft 21 meshes with the first bevel gear 23 on the horizontal shaft through the second bevel gear 25, driving the horizontal shaft to rotate. The incomplete bevel gear 24 on the horizontal shaft rotates with the shaft and intermittently meshes with the adjusting bevel gear 26 outside the adjusting cylinder 15 through the meshing hole of the sewage tank 1. The intermittent meshing of the incomplete bevel gear 24 and the adjusting bevel gear 26 drives the adjusting cylinder 15 to rotate around the rotating shaft on the inclined base 14 (the adjusting cylinder 15 can rotate circumferentially). Since the height of the feeding hole 16 decreases along the axis, and the feeding hole 16 at different angles corresponds to different areas in the sewage tank 1 when the adjusting cylinder 15 rotates, the dynamic adjustment of the carbon source placement position in the circumferential and height is finally achieved, ensuring that the carbon source is more evenly distributed in the sewage tank 1.

[0046] When the drive motor 7 rotates in the forward direction, the screw conveyor 13 feeds the carbon source from the carbon source storage mechanism into the adjusting cylinder 15, and initially feeds it into the wastewater tank 1 through the tiered feeding holes 16. At this time, the drive adjustment mechanism is not working, and the feeding position is fixed. When the drive motor 7 rotates in the reverse direction, the screw conveyor 13 stops conveying, and the drive adjustment mechanism drives the adjusting cylinder 15 to rotate through the incomplete bevel gear 24, changing the orientation of the feeding holes 16 and adjusting the circumferential and height feeding position of the carbon source in the wastewater tank 1.

[0047] By switching the drive motor 7 between forward and reverse directions, the device can alternately realize "carbon source delivery and dispensing" and "dispensing position adjustment," ultimately achieving uniform and efficient addition of polylactic acid carbon source in wastewater tank 1, meeting the continuous carbon source requirements of denitrification reaction. This device achieves bidirectional function through a single drive motor 7, reducing equipment redundancy. Simultaneously, through layered feeding and dynamic orientation design, it improves the contact efficiency between carbon source and wastewater, making it suitable for precise carbon source addition in denitrification wastewater treatment scenarios.

[0048] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A polylactic acid denitrification solid carbon source dosing device, comprising a wastewater tank (1), wherein the top of the wastewater tank (1) is connected to an inlet pipe (2), and the side wall of the wastewater tank (1) is connected to a drain pipe (3), characterized in that: The sewage tank (1) is provided with a feeding hopper (5) and a carbon source storage mechanism, which is covered by the feeding hopper (5). The feeding hopper (5) is connected to a feeding pipe (4). The carbon source storage mechanism transmits carbon source into the carbon source storage mechanism through the feeding pipe (4). The sewage tank (1) is provided with a carbon source dispensing mechanism. The carbon source storage mechanism is provided with a drive motor (7) and a power transmission mechanism. The drive motor (7) is connected to the input end of the power transmission mechanism. The power transmission mechanism is provided with a forward output end and a reverse output end. The power transmission mechanism drives the carbon source dispensing mechanism to dispense carbon source into the sewage tank (1) through the forward output end. The reverse output end of the power transmission mechanism drives the adjustment mechanism to adjust the dispensing position of the carbon source in the sewage tank (1). The carbon source storage mechanism includes a protective box (6), which includes a feeding chamber (601) and a gear chamber (602). The carbon source delivery mechanism includes an inclined conveying cylinder (8), which is connected to the feed hopper (5) through a bend. The inclined conveying cylinder (8) is inclinedly installed inside the sewage tank (1). The side wall of the inclined conveying cylinder (8) is provided with a conveying base elongated hole (9), which is located on the side facing the bottom wall of the sewage tank (1). The positive output end of the power transmission mechanism is provided with a vertical drive shaft (10). The lower end of the vertical drive shaft (10) extends into the bend and is connected to an inclined drive shaft (12) through a universal joint (11). The inclined drive shaft (12) is provided with a spiral conveying rod (13), which is located inside the inclined conveying cylinder (8). The bottom wall of the sewage tank (1) is provided with an inclined base (14). An adjusting cylinder (15) is provided on the inclined base (14) via a rotating shaft. The adjusting cylinder (15) is located outside the inclined conveying cylinder (8). The inner side wall of the adjusting cylinder (15) is in contact with the outer side wall of the inclined conveying cylinder (8). The adjusting cylinder (15) is provided with several feeding holes (16) along the circumference. The power transmission mechanism includes a central shaft (17), which is located at the output end of the drive motor (7). The central shaft (17) is provided with a forward transmission gear (18) and a reverse transmission gear (19). The vertical transmission shaft (10) is provided with a forward driven gear (20) via a first one-way bearing, and the forward driven gear (20) meshes with the forward transmission gear (18). A mounting shaft (21) is vertically arranged inside the gear cavity (602). A reverse driven gear (22) is provided on the mounting shaft (21) through a second one-way bearing, and the reverse driven gear (22) meshes with the reverse transmission gear (19). The drive adjustment mechanism includes a horizontal shaft installed on the inner wall of the gear cavity (602), a first bevel gear (23) and an incomplete bevel gear (24) on the horizontal shaft, a second bevel gear (25) on the mounting shaft (21), and the second bevel gear (25) meshes with the first bevel gear (23). The directional cylinder (15) is fitted with a directional bevel gear (26). The sewage tank (1) has a meshing hole, and the incomplete bevel gear (24) meshes with the directional bevel gear (26) through the meshing hole.

2. The polylactic acid denitration solid carbon source addition device according to claim 1, characterized in that: The feed hopper (5) is located inside the feed chamber (601), and the feed pipe (4) passes through the protective box (6) and extends outward. The power transmission mechanism is located inside the gear chamber (602).

3. The polylactic acid denitration solid carbon source addition device according to claim 1, characterized in that: The width of the adjusting cylinder (15) is not less than the width of the feeding hole (16), and the height of the feeding hole (16) decreases along the axial direction of the adjusting cylinder (15).

4. The polylactic acid denitration solid carbon source addition device according to claim 2, characterized in that: The inclined conveying cylinder (8) has several annular sealing grooves (27) on its outer side wall, and the directional cylinder (15) has an annular sealing gasket (28) on its inner side wall, with the annular sealing gasket (28) located in the corresponding annular sealing groove (27).

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