Automatic dosing device for fine denitrification of sewage plant

Abstract

The utility model discloses a sewage plant fine denitrification's automatic chemical adding device, it includes carbon source storage pool, liquid mixing corridor and intelligent control system, carbon source storage pool includes: carbon source input pipe, chemical adding pump, check valve and carbon source output pipe, liquid mixing corridor includes water inflow flowmeter, COD monitoring probe and water outlet, intelligent control system includes: water inflow flow monitoring module, nitrate nitrogen on -line monitoring module, ammonia nitrogen on -line monitoring module, COD on -line monitoring module and regulation system, chemical adding pump includes drive assembly and pumping assembly, this kind of sewage plant fine denitrification's automatic chemical adding device, through intelligent real -time control, realized the accurate dosing of carbon source, and the denitrification effect is stable, and the operating cost is low, simultaneously, adopts the alternate work of double chamber, and cooperates the eccentric wheel drive shaft structure of worm and gear drive, realized the continuous, stable dosing of carbon source, greatly promoted the operation stability of denitrification system.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an automatic dosing device for refined denitrification in wastewater treatment plants. Background Technology

[0002] Although existing automatic dosing devices for refined nitrogen removal in wastewater treatment plants offer many benefits, they still suffer from the following problems: Most systems still rely on hysteresis control based on effluent total nitrogen values ​​or simple empirical proportions for dosing, failing to respond in real time to drastic fluctuations in influent water quality and quantity. This results in either insufficient carbon source addition affecting nitrogen removal or excessive addition increasing costs and effluent chemical oxygen demand. Secondly, existing single-chamber dosing pumps experience brief flow interruptions or severe pulsations during the switching between suction and discharge strokes. This intermittent and unstable dosing method, especially for rural wastewater where water quality and quantity fluctuate significantly, frequently impacts the biochemical environment within the denitrification tank, hindering the stability of the microbial community and thus affecting nitrogen removal efficiency. Utility Model Content

[0003] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0004] 1. Technical problems to be solved:

[0005] To address the aforementioned problems of control response lag and low reliability of the dosing pump, this utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide an automatic dosing device for refined denitrification in wastewater treatment plants. Through intelligent real-time control, it achieves precise carbon source dosing, stable denitrification effect, and low operating cost. At the same time, by adopting a dual-chamber alternating operation and a worm gear driven eccentric wheel drive shaft structure, it achieves continuous and stable carbon source dosing, which greatly improves the operational stability of the denitrification system.

[0007] 2. Technical Solution:

[0008] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0009] An automatic dosing device for refined denitrification in a wastewater treatment plant includes a carbon source storage tank, a liquid mixing corridor, and an intelligent control system.

[0010] The carbon source storage tank includes: a carbon source input pipe, a dosing pump, a check valve, and a carbon source output pipe;

[0011] The liquid mixing channel includes an inlet flow meter, a COD monitoring probe, and an outlet.

[0012] The intelligent control system includes: an influent flow monitoring module, an online nitrate nitrogen monitoring module, an online ammonia nitrogen monitoring module, an online COD monitoring module, and a control system;

[0013] The dosing pump includes a drive assembly and a pumping assembly.

[0014] As a preferred embodiment of the automatic dosing device for refined denitrification in wastewater treatment plants according to this utility model, the driving component includes a motor, the output end of the motor is provided with a worm gear, the outer circumference of the worm gear is meshed with a worm wheel, the side wall of the worm wheel is inserted into a driving shaft, the side wall of the driving shaft is integrally formed with multiple eccentric wheels, and multiple connecting shafts are integrally formed between the multiple eccentric wheels.

[0015] As a preferred embodiment of the automatic dosing device for refined nitrogen removal in wastewater treatment plants according to this utility model, the pumping assembly includes multiple connecting rods, multiple connecting shafts are inserted into the side walls of the multiple connecting rods, piston heads are hinged to the bottom of the multiple connecting rods, multiple sealing scraper rings are sleeved on the outer circumference of the multiple piston heads, multiple pump chambers are slidably connected to the outer circumference of the multiple sealing scraper rings, multiple feed ports are opened on the outer circumference of the multiple pump chambers, feed pipes are welded to the side walls of the multiple feed ports, multiple discharge ports are opened at the bottom of the multiple pump chambers, and discharge pipes are welded to the bottom of the multiple discharge ports.

[0016] As a preferred embodiment of the automatic dosing device for refined nitrogen removal in a wastewater treatment plant according to this utility model, the input end of the liquid mixing corridor is provided with an inlet, the inlet flow meter is provided on the side wall of the inlet, the COD monitoring probe is provided on the side end of the inlet flow meter, the output end of the liquid mixing corridor is provided with an outlet, the outlet is provided with an ammonia nitrogen monitor, the output end of the outlet is connected to a denitrification tank, and the interior of the denitrification tank is provided with a nitrate nitrogen monitor.

[0017] As a preferred embodiment of the automatic dosing device for refined denitrification in a wastewater treatment plant according to this utility model, a carbon source input pipe is provided at the input end of the feed pipe, a carbon source storage tank is provided at the input end of the carbon source input pipe, a check valve is provided at the output end of the discharge pipe, a carbon source output pipe is provided at the output end of the check valve, and the output end of the carbon source output pipe is connected to the liquid mixing corridor.

[0018] As a preferred embodiment of the automatic dosing device for refined nitrogen removal in a wastewater treatment plant according to this utility model, the influent flow monitoring module is electrically connected to the influent flow meter, the nitrate nitrogen online monitoring module is electrically connected to the nitrate nitrogen meter, the ammonia nitrogen online monitoring module is electrically connected to the ammonia nitrogen meter, the COD online monitoring module is electrically connected to the COD monitoring probe, and the control system is electrically connected to the motor.

[0019] As a preferred embodiment of the automatic dosing device for refined denitrification in a wastewater treatment plant according to this utility model, a rectangular drive block is integrally formed and connected to the outer circumference of the input end of the drive shaft, and an external shaft with a hexagonal structure is integrally formed and connected to the other end of the drive shaft. A protective shell is sleeved on the outer circumference of the drive shaft, and an outer shell is bolted to the bottom of the protective shell. A second protective shell is bolted to one side wall of the protective shell, and a worm gear is inserted into the inner cavity side wall of the second protective shell. The motor is bolted to the inner cavity side wall of the second protective shell.

[0020] 3. Beneficial effects:

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This automatic dosing device for refined nitrogen removal in wastewater treatment plants uses an intelligent control system to collect real-time data on multiple parameters, including influent flow rate, ammonia nitrogen in nitrification tank effluent, COD in denitrification tank influent, and nitrate nitrogen in effluent. Feedforward control provides rapid response to load changes, while feedback control finely adjusts the dosage, forming a closed-loop control system. This ensures that carbon source dosing is synchronized with the system's actual needs at any given moment, achieving precise dosing with "zero delay." Furthermore, this control strategy effectively addresses the large fluctuations in the quality and quantity of rural wastewater. It ensures sufficient carbon source for denitrification under all circumstances, guaranteeing stable effluent quality while avoiding excessive carbon source dosing, maximizing cost savings and preventing secondary pollution.

[0023] This automatic dosing device for refined nitrogen removal in wastewater treatment plants uses a double eccentric wheel structure on the drive shaft to drive the piston heads of two pump chambers to alternately perform chemical suction and discharge operations. When one piston is in the discharge stroke, the other piston is in the suction stroke. The two are complementary in phase, which makes the flow rate and pressure of the chemical solution output from the common discharge pipe very stable and continuous. This almost pulsation-free dosing method provides a constant and stable carbon source supply for the denitrification tank, effectively avoids hydraulic shock, creates an excellent biochemical reaction environment, and significantly improves the stability of the nitrogen removal effect. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0025] Figure 1 This utility model discloses an automatic dosing device for refined denitrification in wastewater treatment plants. (Process diagram of the automatic dosing device for refined denitrification in wastewater treatment plants)

[0026] Figure 2 This is a schematic diagram of the intelligent control system of an automatic dosing device for refined denitrification in a wastewater treatment plant, according to the present invention.

[0027] Figure 3 This is a schematic diagram of the overall structure of the dosing pump of an automatic dosing device for refined denitrification in a wastewater treatment plant, according to this utility model.

[0028] Figure 4 This is a schematic diagram of the drive component structure of the dosing pump in an automatic dosing device for refined denitrification in a wastewater treatment plant, according to the present invention.

[0029] Figure 5 This is a schematic diagram of the pumping component structure of an automatic dosing device for refined denitrification in a wastewater treatment plant, according to the present invention.

[0030] The diagram labels are as follows: 1. Carbon source storage tank; 2. Liquid mixing corridor; 3. Intelligent control system; 11. Carbon source input pipe; 12. Dosing pump; 13. Check valve; 14. Carbon source output pipe; 21. Inlet flow meter; 22. COD monitoring probe; 23. Outlet; 31. Inlet flow monitoring module; 32. Nitrate nitrogen online monitoring module; 33. Ammonia nitrogen online monitoring module; 34. COD online monitoring module; 35. Control system; 4. Drive assembly; 41. Protective shell one; 42. Motor; 43. Worm gear; 44. Protective shell two; 45. Worm wheel; 46. Eccentric wheel; 47. External shaft; 48. Drive shaft; 49. Connecting shaft; 5. Pumping assembly; 51. Connecting rod; 52. Outer shell; 53. Piston head; 54. Sealing scraper ring; 55. Feed pipe; 56. Pump chamber; 57. Discharge pipe. Detailed Implementation

[0031] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0033] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0034] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0036] This utility model provides an overall structural schematic diagram of an embodiment of an automatic dosing device for refined nitrogen removal in a wastewater treatment plant, including:

[0037] Please see Figures 1-5 An automatic dosing device for fine denitrification in a wastewater treatment plant according to this embodiment includes a carbon source storage tank 1, a liquid mixing corridor 2, and an intelligent control system 3.

[0038] The carbon source storage tank 1 includes: a carbon source input pipe 11, a dosing pump 12, a check valve 13, and a carbon source output pipe 14;

[0039] The liquid mixing channel 2 includes an inlet flow meter 21, a COD monitoring probe 22, and an outlet 23;

[0040] The intelligent control system 3 includes: an influent flow monitoring module 31, an online nitrate nitrogen monitoring module 32, an online ammonia nitrogen monitoring module 33, an online COD monitoring module 34, and a control system 35;

[0041] The dosing pump 12 includes a drive assembly 4 and a pumping assembly 5.

[0042] It is worth noting that, in order to drive the piston head 53 to move, the drive assembly 4 specifically includes a motor 42. The output end of the motor 42 is connected to a worm gear 43 through a pre-reserved keyway. A worm wheel 45 meshes with the outer circumference of the worm gear 43. A drive shaft 48 is inserted into the side wall of the worm wheel 45. Multiple eccentric wheels 46 are integrally connected to the side wall of the drive shaft 48. Multiple connecting shafts 49 are integrally connected between the multiple eccentric wheels 46.

[0043] Next, in order to control the addition of carbon source materials, specifically, the pumping assembly 5 includes multiple connecting rods 51, multiple connecting shafts 49 are inserted into the side walls of the multiple connecting rods 51, and piston heads 53 are hinged to the bottom of the multiple connecting rods 51. Multiple sealing scraper rings 54 are sleeved on the outer circumference of the multiple piston heads 53. The sealing scraper rings 54 are made of rubber and are used to seal and protect the feed inlet of the pump chamber 56 and assist in scraping off the particle residue inside the pump chamber 56. Multiple pump chambers 56 are slidably connected to the outer circumference of the multiple sealing scraper rings 54. Multiple feed inlets are opened on the outer circumference of the multiple pump chambers 56. Feed pipes 55 are welded to the side walls of the multiple feed inlets. Multiple discharge ports are opened at the bottom of the multiple pump chambers 56. Discharge pipes 57 are welded to the bottom of the multiple discharge ports.

[0044] Meanwhile, to facilitate the detection of the influent flow rate and the content of added materials in the water, specifically, the input end of the liquid mixing corridor 2 is provided with an inlet, the side wall of the inlet is connected to an influent flow meter 21 by bolts, the side end of the influent flow meter 21 is connected to a COD monitoring probe 22 by bolts, the output end of the liquid mixing corridor 2 is provided with an outlet 23, the side wall of the outlet 23 is connected to an ammonia nitrogen monitor by bolts, the output end of the outlet 23 is connected to a denitrification tank, and the inside of the denitrification tank is connected to a nitrate nitrogen monitor by bolts.

[0045] Furthermore, to facilitate carbon source transmission, specifically, the input end of the feed pipe 55 is bolted to a carbon source input pipe 11, the input end of the carbon source input pipe 11 is bolted to a carbon source storage tank 1, the output end of the discharge pipe 57 is bolted to a check valve 13, the output end of the check valve 13 is bolted to a carbon source output pipe 14, and the output end of the carbon source output pipe 14 is inserted into a liquid mixing corridor 2.

[0046] It is worth noting that, in order to achieve intelligent control, specifically, the influent flow monitoring module 31 is electrically connected to the influent flow meter 21 to know the real-time water volume entering the denitrification tank; the nitrate nitrogen online monitoring module 32 is electrically connected to the nitrate nitrogen meter for feedback control, measuring the denitrification effect and determining the carbon source dosage; the ammonia nitrogen online monitoring module 33 is electrically connected to the ammonia nitrogen meter to estimate the nitrate nitrogen load entering the denitrification tank; the COD online monitoring module 34 is electrically connected to the COD monitoring probe 22 to assess the endogenous carbon source content of the wastewater in real time; and the control system 35 is electrically connected to the motor 42 to control the start and stop of the 12 dosing pumps and add chemicals as needed.

[0047] Finally, to facilitate the protection of the internal structure, specifically, a rectangular drive block is integrally formed on the outer circumference of the input end of the drive shaft 48, and an external shaft 47 is integrally formed on the other end of the drive shaft 48. When the motor 42, worm gear 45, and worm 43 are damaged and have been disassembled for maintenance, the dosing pump 12 can be manually operated through the external handle of the external shaft 47. The external shaft 47 has a hexagonal structure. A protective shell 41 is sleeved on the outer circumference of the drive shaft 48. The bottom of the protective shell 41 is bolted to the outer shell 52. The side wall of the protective shell 41 is bolted to the protective shell 44. The worm 43 is inserted into the inner cavity side wall of the protective shell 44. The motor 42 is bolted to the inner cavity side wall of the protective shell 44.

[0048] In addition, the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0049] Combination Figures 1-5 The automatic dosing device for refined denitrification in a wastewater treatment plant, as described in this embodiment, is used as follows:

[0050] 1. System startup and automatic operation:

[0051] First, ensure that the carbon source storage tank 1 contains sufficient liquid carbon source. Connect the power supply of the entire device to the power supply of the intelligent control system 3. Set the target parameters on the operation interface of the intelligent control system 3, such as the desired nitrate nitrogen concentration value of the denitrification tank effluent. Start the system operation mode. Wastewater enters the liquid mixing corridor 2 through the inlet. The inlet flow meter 21 monitors the inlet water flow in real time, and the chemical oxygen demand (COD) monitoring probe monitors the intrinsic carbon source content in the wastewater in real time. At the same time, the ammonia nitrogen monitor installed at the nitrification tank outlet 23 and the nitrate nitrogen monitor inside the denitrification tank transmit real-time data. The wastewater is sent to the intelligent control system 3. The intelligent control system 3 calculates and issues a command based on the influent flow rate, ammonia nitrogen concentration, chemical oxygen demand and nitrate nitrogen concentration, and starts the drive motor 42 of the dosing pump 12. After the motor 42 is reduced in speed by the worm gear 43 and worm wheel 45, it drives the drive shaft 48 to rotate. Then, through the connecting rod 51, it drives two pistons to alternately perform the suction and discharge operations in their respective pump chambers. The carbon source is continuously and steadily injected into the liquid mixing corridor 2 through the carbon source output pipe 14. In the corridor, the carbon source is fully mixed with the wastewater and then enters the denitrification tank through the outlet 23 for efficient denitrification.

[0052] 2: Anti-clogging working procedure of dosing pump 12:

[0053] After receiving the control signal from the control system 35, the motor 42 of the dosing pump 12 starts to rotate, driving the worm 43 at its output end to rotate. The worm 43 meshes with the worm wheel 45, transmitting power to the drive shaft 48. The two eccentric wheels 46 on the drive shaft 48 rotate accordingly. The two eccentric wheels 46 drive the two connecting rods 51 to move through the connecting shaft 49, thereby driving the two piston heads 53 to make reciprocating linear motion with a phase difference of 180 degrees in their respective cylindrical chambers. The sealing scraper ring 54 on the piston head 53 moves close to the inner wall of the pump chamber to scrape off any initial crystallized soft scale that may be attached. During this process, one piston head 53 performs the discharge stroke, pressing the carbon source in the chamber into the discharge pipe 57 through the discharge port at the bottom of the chamber. At the same time, the other piston head 53 is performing the suction stroke, sucking the carbon source into its chamber from the feed pipe 55. This alternating cycle realizes the continuous and stable delivery of the carbon source to the liquid mixing corridor 2.

[0054] 3. Emergency manual operation and maintenance:

[0055] In case of power outage or drive motor 42 failure, the operator can open the protective cover on the side of the drive assembly 4, insert the manual crank into the hexagonal external shaft 47 at the end of the drive shaft 48, and manually crank the crank to directly drive the camshaft to rotate, thereby driving the piston to continue working and realizing emergency carbon source addition to ensure that the denitrification biochemical process is not interrupted. When routine maintenance or cleaning of the pump chamber 56 is required, the relevant valves can be closed, the outer shell 52 of the pumping assembly 5 can be removed, and the piston, pump chamber and flow channel can be directly accessed. Due to the modular design, this maintenance process does not require disassembly of the drive motor 42 or complex pipelines, which is simple and quick.

[0056] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An automatic dosing device for refined nitrogen removal in a wastewater treatment plant, characterized in that, It includes a carbon source storage tank (1), a liquid mixing corridor (2), and an intelligent control system (3); The carbon source storage tank (1) includes: a carbon source input pipe (11), a dosing pump (12), a check valve (13), and a carbon source output pipe (14); The liquid mixing channel (2) includes an inlet flow meter (21), a COD monitoring probe (22), and an outlet (23); The intelligent control system (3) includes: an influent flow monitoring module (31), an online nitrate nitrogen monitoring module (32), an online ammonia nitrogen monitoring module (33), an online COD monitoring module (34), and a control system (35); The dosing pump (12) includes a drive assembly (4) and a pumping assembly (5).

2. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 1, characterized in that, The drive assembly (4) includes a motor (42), the output end of which is provided with a worm (43), a worm wheel (45) meshing with the outer circumference of the worm (43), a drive shaft (48) inserted into the side wall of the worm wheel (45), and multiple eccentric wheels (46) integrally formed and connected to the side wall of the drive shaft (48), and multiple connecting shafts (49) integrally formed and connected between the multiple eccentric wheels (46).

3. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 2, characterized in that, The pumping assembly (5) includes multiple connecting rods (51), multiple connecting shafts (49) are inserted into the side walls of the multiple connecting rods (51), piston heads (53) are hinged to the bottom of the multiple connecting rods (51), multiple sealing scraper rings (54) are sleeved on the outer circumference of the multiple piston heads (53), multiple pump chambers (56) are slidably connected to the outer circumference of the multiple sealing scraper rings (54), multiple feed ports are opened on the outer circumference of the multiple pump chambers (56), feed pipes (55) are welded to the side walls of the multiple feed ports, multiple discharge ports are opened at the bottom of the multiple pump chambers (56), and discharge pipes (57) are welded to the bottom of the multiple discharge ports.

4. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 3, characterized in that, The liquid mixing channel (2) is provided with an inlet at its input end. An inlet flow meter (21) is provided on the side wall of the inlet. A COD monitoring probe (22) is provided on the side end of the inlet flow meter (21). The liquid mixing channel (2) is provided with an outlet (23) at its output end. An ammonia nitrogen monitor is provided on the outlet (23). The outlet (23) is connected to a denitrification tank. A nitrate nitrogen monitor is provided inside the denitrification tank.

5. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 4, characterized in that, The feed pipe (55) is provided with a carbon source input pipe (11) at its input end, and a carbon source storage tank (1) is provided at the input end of the carbon source input pipe (11). The discharge pipe (57) is provided with a check valve (13) at its output end, and a carbon source output pipe (14) is provided at the output end of the check valve (13). The output end of the carbon source output pipe (14) is connected to the liquid mixing corridor (2).

6. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 5, characterized in that, The influent flow monitoring module (31) is electrically connected to the influent flow meter (21), the nitrate nitrogen online monitoring module (32) is electrically connected to the nitrate nitrogen monitor, the ammonia nitrogen online monitoring module (33) is electrically connected to the ammonia nitrogen monitor, the COD online monitoring module (34) is electrically connected to the COD monitoring probe (22), and the control system (35) is electrically connected to the motor (42).

7. The automatic dosing device for refined nitrogen removal in wastewater treatment plants according to claim 6, characterized in that, A rectangular drive block is integrally formed on the outer circumference of the input end of the drive shaft (48), and an external shaft (47) is integrally formed on the other end of the drive shaft (48). The external shaft (47) has a hexagonal structure. A protective shell one (41) is sleeved on the outer circumference of the drive shaft (48). An outer shell (52) is bolted to the bottom of the protective shell one (41). A protective shell two (44) is bolted to the side wall of the protective shell one (41). The worm gear (43) is inserted into the inner cavity side wall of the protective shell two (44). The motor (42) is bolted to the inner cavity side wall of the protective shell two (44).

Images