Carbon source feeding system for sewage treatment

Abstract

The utility model discloses a carbon source dosing system for sewage treatment, which comprises a nitrate nitrogen sensor, an automatic control device and a carbon source dosing device which are connected together through signal control, the carbon source dosing device comprises at least one storage pool, a carbon source supply pipeline communicated with the storage pool, and a carbon source conveying pipe network communicated with the storage pool, the carbon source conveying pipe network comprises a plurality of conveying pipelines and a standby pipeline, the conveying pipelines are used for conveying a carbon source to the sewage treatment tank, the conveying pipelines and the standby pipeline respectively comprise a carbon source metering and conveying assembly, and the carbon source metering and conveying assembly comprises a metering pump in signal connection with the automatic control equipment. The technical problem that in the prior art, a carbon source feeding system cannot achieve accurate feeding is solved, and meanwhile the stability of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially relates to a carbon source feeding system for sewage treatment. BACKGROUND

[0002] Most of sewage treatment plants use A 2 O process to treat urban sewage, which has good denitrification effect; in the sewage treatment process, the addition of carbon source is crucial to the performance of the biological treatment unit, the carbon source provides the necessary energy and carbon substrate for microbial metabolism, thereby promoting the degradation of organic pollutants, sodium acetate is a commonly used additional carbon source, especially under anoxic and anaerobic conditions, sodium acetate can be quickly utilized by microorganisms, effectively improving the efficiency of denitrification and biological phosphorus removal. In the anoxic denitrification process, microorganisms utilize the carbon source in sodium acetate to reduce nitrate to nitrogen, reducing nitrogen pollution in water. At the same time, in the biological phosphorus removal process, sodium acetate as a carbon source can promote the growth of polyphosphorus bacteria and enhance the phosphorus removal effect. Therefore, precise control of the dosage of sodium acetate and guarantee of the total nitrogen content of the effluent to meet the discharge standard are of great significance to the stable operation and optimization of the treatment effect of the sewage treatment plant.

[0003] At present, the common dosing methods in sewage treatment are manual dosing and precise dosing, manual dosing is difficult to accurately control the dosage of the reagent, causing problems such as non-compliance of water quality and waste of reagent, and some sewage treatment plants with high automation degree use precise dosing mode for sodium hypochlorite addition, that is, the instantaneous inflow is collected by the computer central control system, and the flow of the dosing pump is automatically adjusted according to the set dosing ratio. Since the water quality of the sewage treatment plant changes greatly, it lacks scientificity to determine the reagent dosage according to the fixed dosing ratio. Therefore, it is necessary to design a carbon source feeding system based on actual needs to realize precise and uniform dosing of reagents. UTILITY MODEL CONTENT

[0004] The present application provides a carbon source feeding system for sewage treatment, which solves the technical problem that the existing carbon source feeding system cannot be accurately dosed.

[0005] The utility model adopts the technical scheme: a carbon source feeding system for sewage treatment, comprising a nitrate sensor, a self-control device and a carbon source feeding device connected by signals, the carbon source feeding device comprises: at least one storage tank, a carbon source supply pipeline in communication with the storage tank, and a carbon source delivery pipe network in communication with the storage tank, the carbon source delivery pipe network comprises a plurality of delivery pipelines and standby pipelines, the delivery pipelines are used to deliver carbon source to the sewage treatment tank, the delivery pipelines and standby pipelines each comprise a carbon source metering delivery assembly, and the carbon source metering delivery assembly comprises a metering pump in signal connection with the self-control device.

[0006] Further, the carbon source metering delivery assembly further comprises a switch valve, a pulse damper, a back pressure valve and a Y-type filter arranged at the input end of the metering pump, and a safety valve, a manual ball valve and a flow meter arranged at the output end of the metering pump.

[0007] Further, the bottom of the storage pool is provided with a liquid collecting groove, the carbon source delivery pipe network communicates with the liquid collecting groove, and the top of the storage pool is further provided with a manhole, a feeding port, an overflow port, an exhaust port, a sampling port, a backflow port and an ultrasonic liquid level meter.

[0008] Further, the carbon source replenishing pipeline comprises at least two unloading pumps connected in parallel, the input end of the unloading pump is provided with a manual ball valve, the output end of the unloading pump is provided with a manual ball valve and a check valve, and the communication part of the carbon source replenishing pipeline and the storage pool is further provided with a solenoid valve.

[0009] Further, each of the delivery pipelines and the standby pipelines communicates with each other through a connecting pipeline, and the connecting pipeline is provided with a switch valve.

[0010] Further, the delivery pipeline and the standby pipeline are further connected with a reclaimed water input pipe, the reclaimed water input pipe communicates with the input end of the metering pump, the reclaimed water input pipe is further provided with a switch valve for controlling the on-off of each metering pump, and the output end of each metering pump is communicated with a drainage pipe which is connected to a drainage ditch.

[0011] Further, the storage pool is made of PE material and has a wall thickness of not less than 26 mm, the metering pump is a hydraulic diaphragm type metering pump, the pulse damper is a gas bag type damper, and the Y-type filter is made of PVC material.

[0012] Further, the delivery pipeline and the standby pipeline are further provided with a pressure gauge and a flow meter.

[0013] Compared with existing technologies, this invention uses a nitrate nitrogen sensor to monitor the nitrate nitrogen content in wastewater in real time. Since the concentration of nitrate nitrogen is a key indicator for determining carbon source demand during wastewater treatment, the sensor can acquire real-time dynamic data on wastewater treatment by detecting changes in nitrate nitrogen levels. This function ensures that the system can accurately perceive changes in carbon source demand during wastewater treatment, providing precise data support for the automatic control equipment. Based on the real-time data transmitted by the nitrate nitrogen sensor, the automatic control equipment dynamically adjusts the carbon source dosage. Through analysis of the sensor data, the automatic control equipment can immediately respond to changes in nitrogen content in the wastewater and automatically adjust the operating status and output of the metering pump. This automatic adjustment mechanism allows the system to add carbon source according to actual needs, avoiding excessive or insufficient carbon source addition and ensuring that the carbon source dosage is always at the optimal level. Metering pumps are crucial actuators in carbon source dosing systems. They are connected to the automatic control equipment and directly controlled by its commands. The design and function of metering pumps ensure that they can deliver carbon sources with high precision and controllability, accurately controlling the flow rate and dosage of carbon sources. Through this precise control mechanism, carbon sources can be delivered to the wastewater treatment tank in a constant and appropriate manner, meeting the actual needs of the wastewater treatment process.

[0014] In addition, the system is equipped with a backup pipeline. When the main delivery pipeline fails or requires maintenance, the backup pipeline can be put into use in a timely manner to ensure the continuous operation of the system. This not only improves the stability of the system, but also prevents inaccurate carbon source dosing due to interruption of dosing, further ensuring the overall accuracy of the system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0016] Figure 1 This is a block diagram of the overall structure of the carbon source dosing system in this utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure of the carbon source dosing device in this utility model;

[0018] Figure 3 This utility model contains a schematic diagram of the structure of one of the conveying pipelines in the carbon source conveying network.

[0019] Figure 4 This is a top-view cross-sectional structural diagram of the storage pool in this utility model;

[0020] Figure 5 It is the cross section structure schematic diagram of the storage pool side direction of the utility model.

[0021] 1, nitrate sensor; 2, automatic control equipment; 3, carbon source adding equipment; 4, storage pool; 5, carbon source supply pipeline; 6, carbon source delivery pipe network; 61, delivery pipeline; 62, standby pipeline; 7, metering pump; 8, on-off valve; 9, pulse damper; 10, back pressure valve; 11, Y type filter; 12, safety valve; 14, flowmeter; 15, liquid collecting tank; 16, manhole; 17, inlet; 18, overflow; 19, exhaust port; 20, sampling port; 21, ultrasonic liquid level meter; 22, backflow port; 23, drug discharge pump; 24, manual ball valve; 25, check valve; 26, electromagnetic valve; 27, connecting pipeline; 28, reclaimed water input pipe; 29, drain pipe; 30, drainage ditch; 31, pressure gauge. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clearly and clearly, the utility model is further described in detail below in combination with the drawings and examples.It should be understood that the specific examples described herein are only used to explain the utility model and not used to limit the utility model.

[0023] The utility model provides a kind of carbon source adding system for sewage treatment, as shown in Figure 1 It includes three major parts, respectively nitrate sensor 1, automatic control equipment 2 and carbon source adding equipment 3, nitrate sensor 1 detects the nitrate content in sewage treatment tank, nitrate sensor 1 can be set in each sewage treatment tank according to demand, for example, it can be evenly set in biological pool and deep bed filter according to certain order, automatic control equipment 2 is signal connected with nitrate sensor 1, nitrate sensor 1 collects and transmits the data in sewage tank to automatic control equipment 2, and automatic control equipment 2 includes PLC control unit for controlling carbon source adding equipment 3 to accurately add carbon source according to the nitrate content in sewage.

[0024] Among them, carbon source adding equipment 3 is composed of storage pool 4, carbon source supply pipeline 5 and carbon source delivery pipe network 6, storage pool 4 is used to store carbon source, and carbon source includes but is not limited to sodium acetate (sodium acetate) etc.;Carbon source supply pipeline 5 is arranged at the input end of storage pool 4, for extracting carbon source to supplement storage pool 4;Carbon source delivery pipe network 6 is arranged at the output end of storage pool 4, for adding carbon source to each sewage treatment tank. Storage pool 4, carbon source supply pipeline 5 and carbon source delivery pipe network 6 can be adaptively arranged according to actual use demand, and the so-called adaptive arrangement includes but is not limited to the number and arrangement of storage pool 4, the distribution and number of carbon source supply pipeline 5, the delivery direction and delivery amount of carbon source delivery pipe network 6 etc.

[0025] APPENDIX Figures 2 to 5 For one of the specific embodiments, the embodiment is only used as an example and does not limit the technical scheme of the utility model.

[0026] As Figure 2 , 4 , as shown in FIG. 5, in one embodiment, two storage pools 4 are provided, and the storage pool 4 is used for storing sodium acetate as a carbon source. A liquid collecting tank 15 is arranged at the bottom of the storage pool 4. The liquid collecting tank 15 is a small-sized tank concave downward, so that the sodium acetate in the storage pool 4 is collected in the liquid collecting tank 15. The carbon source conveying pipe network 6 is communicated with the liquid collecting tank 15, so as to facilitate the extraction and conveying of the sodium acetate and reduce the possibility of air suction. A manhole 16, a feeding port 17, an overflow port 18, an exhaust port 19, a sampling port 20 and an ultrasonic liquid level meter 21 are further arranged at the top of the storage pool 4. The manhole 16 facilitates the operators to enter the inside of the storage pool 4 for inspection, maintenance and cleaning work. The feeding port 17 can be communicated with the carbon source supply pipeline 5 for injecting sodium acetate or other materials into the storage pool 4. The overflow port 18 prevents the liquid in the storage pool 4 from being overfilled, ensures that the sodium acetate will not overflow, avoids waste or safety hazards. The exhaust port 19 is provided with a gas pipe for discharging the gas in the inside of the storage pool 4 caused by the injection of sodium acetate or other operations, maintains the internal pressure balance, prevents overpressure, and the sampling port 20 is used for extracting a sodium acetate sample from the storage pool 4, so as to detect the quality or measure the concentration. The ultrasonic liquid level meter 21 is used for real-time monitoring of the liquid level height of the sodium acetate in the storage pool 4, so as to ensure that the system can be automatically adjusted and controlled according to the liquid level change, and the stable supply of sodium acetate is ensured. The backflow port 22 is communicated with the carbon source conveying pipe network 6. When the carbon source solution circulates, the risk of impurity deposition and blockage in the pipeline can be reduced. By arranging the backflow port 22, part of the carbon source solution will be guided back to the storage pool 4, so as to prevent the carbon source in the conveying pipeline 61 from blocking the pipeline when it is static for a long time, and ensure the smooth operation of the system.

[0027] In addition to the necessary connecting pipelines at the carbon source supply pipeline 5, the pipelines are further provided with a discharging pump. Two parallel discharging pumps 23 are arranged to ensure the reliability and continuity of the system. A manual ball valve 24 is arranged at the input end of each discharging pump 23, so as to facilitate the manual control of the start and stop of the pump and the maintenance. The output end of the discharging pump 23 is also provided with a manual ball valve 24, so as to isolate the pump when necessary, and further improve the operation flexibility and safety of the system. A check valve 25 is further installed at the output end of the discharging pump 23, so as to prevent the carbon source from flowing back to the pump, ensure the one-way flow of the fluid in the conveying process, and avoid damaging the pump and the pipeline or affecting the performance of the system. An electromagnetic valve 26 is further installed at the part where the carbon source supply pipeline 5 is communicated with the storage pool 4, so as to accurately control the supply amount of the carbon source through the electric control mode, realize the automatic management, and further improve the accuracy and response speed of the system.

[0028] Further, in combination with theFigure 2 , 3 As shown, the carbon source delivery network 6 consists of multiple delivery pipelines 61 and a backup pipeline 62. The design of these pipelines ensures a stable and continuous delivery of the carbon source to the wastewater treatment tank. Simultaneously, it can switch to the backup pipeline 62 when necessary, improving the system's reliability and flexibility. Each delivery pipeline 61 and backup pipeline 62 is equipped with a carbon source metering and delivery component to ensure accurate metering and delivery of the carbon source. In this embodiment, there are four delivery pipelines 61 and one backup pipeline 62. Based on the carbon source usage requirements, three of the four delivery pipelines 61 are used to deliver carbon source to the biological treatment tank, and one is used to deliver carbon source to the deep bed filter. The backup pipeline 62 is connected to all delivery pipelines 61. The backup pipeline 62 is normally closed and is opened when a delivery pipeline 61 fails.

[0029] Carbon source metering and delivery assemblies are installed on both the delivery pipeline 61 and the backup pipeline 62. These assemblies consist of several functional electrical components. The core of the assembly is the metering pump 7, which is signal-connected to the automatic control device 2. It controls the carbon source delivery rate in real time through the automatic control system. To ensure system stability and safety, the input end of the metering pump 7 is equipped with a series of auxiliary devices: a switching valve 8 to control the inflow of carbon source, facilitating the start or stop of the delivery process; a pulse damper 9 to balance pressure fluctuations within the pipeline, reducing the impact of pulses on the system and ensuring smooth delivery; a back pressure valve 10 to maintain appropriate back pressure within the pipeline, ensuring the accuracy of the metering pump 7 and the stability of delivery; and a Y-type filter 11 to filter impurities in the carbon source, preventing pump and pipeline blockage and extending the system's service life. At the output end of the metering pump 7, the following components are also provided: a safety valve 12 to automatically release pressure when the system pressure is too high, preventing equipment damage and safety accidents; and a manual ball valve 24 to provide manual control for operation and maintenance when needed. Flow meter 14 monitors the flow rate of the carbon source in real time to ensure that the delivery volume meets the set standards. Pressure gauge 31 is used to detect the hydraulic pressure of the pipeline.

[0030] To ensure the interconnectivity between the various delivery pipelines 61 and the backup pipeline 62, these pipelines are connected by a connecting pipe 27, and a switch valve 8 is provided on the connecting pipe 27. This design allows the delivery task to be transferred to other pipelines by switching the switch valve 8 when a problem occurs in one pipeline, ensuring the continuous operation of the system and the convenience of maintenance.

[0031] Further, a reclaimed water input pipe 28 is also connected to the conveying pipe 61 and the standby pipe 62, further enhancing the functionality and operational flexibility of the system. The reclaimed water input pipe 28 is connected to the input end of the metering pump 7, allowing the pipe to be flushed and maintained with reclaimed water if necessary, maintaining the cleanliness and high efficiency of the system. A switch valve 8 is also installed on the reclaimed water input pipe 28, which controls the on-off of each metering pump 7, allowing the operator to flexibly choose when to introduce reclaimed water for pipe flushing operations. Through the control of these switch valves 8, the system can perform cleaning operations as needed to prevent the accumulation of carbon source residues in the pipe, thereby extending the service life of the equipment. In addition, the output end of each metering pump 7 is also connected to a drain pipe 29, which directly drains into a drain 30, ensuring that the wastewater generated during flushing or maintenance can be quickly and safely discharged from the system. The drain pipe 29 is designed to effectively drain the remaining carbon source and reclaimed water during cleaning, preventing blockage or contamination in the pipe and maintaining the overall cleanliness and high efficiency of the system. This flushing function ensures the stability and reliability of the system after a long period of operation, reducing the risk of failure due to pipe contamination or blockage. In this embodiment, the reclaimed water input pipe 28 is connected to the front end of the Y-type filter 11 to facilitate simultaneous flushing of the carbon source metering and conveying assembly, including the Y-type filter 11.

[0032] Preferably, the storage tank 4 is made of polyethylene (PE), which has excellent chemical corrosion resistance and good toughness, suitable for long-term use in complex environments such as sewage treatment, with a wall thickness of not less than 26 mm. This design ensures the strength and durability of the storage tank 4, which can maintain structural stability under high pressure, preventing leakage and rupture, further improving the safety of the system.

[0033] Preferably, the metering pump 7 is a hydraulic diaphragm metering pump 7, which is known for its high precision and high reliability. Driven by a hydraulic system, the metering pump 7 can accurately control the dosage of carbon source and work stably under high pressure and high flow rate conditions. Its design ensures that the carbon source can be added in a constant and controllable manner during transportation, avoiding errors caused by uneven pumping.

[0034] Preferably, the pulse damper 9 is designed as an air bag, which can effectively alleviate the pressure fluctuations and pulse effects generated during pumping. This damper can reduce pressure pulsations in the system caused by pumping, ensuring the smoothness of carbon flow, thereby further improving the accuracy of the dosage.

[0035] Preferably: the PVC material of the Y-type filter 11, the Y-type filter 11 uses the PVC material, has excellent chemical resistance and corrosion resistance, can effectively filter impurities in the carbon source, and prevent impurities from entering the pipeline and the pumping system. The PVC material not only ensures the service life of the filter, but also reduces the maintenance frequency while ensuring the filtering efficiency.

[0036] The utility model discloses a nitrate nitrogen sensor 1 is responsible for real -time monitoring the nitrate nitrogen content in sewage, because the concentration of nitrate nitrogen in the sewage treatment process is the key index of judging carbon source demand, and the sensor can obtain the real -time dynamic data of sewage treatment through detecting the change of nitrate nitrogen in sewage, and this function ensures that the system can accurately perceive the demand change of carbon source in the sewage treatment process, and provides accurate data support for the automatic control equipment 2. According to the real -time data transmission of nitrate nitrogen sensor 1, the automatic control equipment 2 carries out dynamic adjustment to the adding amount of carbon source, and through the analysis of sensor data, the automatic control equipment 2 can immediately respond to the change of nitrogen content in sewage, and automatically adjusts the working state and output of the metering pump 7, and this automatic adjustment mechanism makes the system can add carbon source according to actual needs, avoids excessive or insufficient carbon source addition, and ensures that the adding amount of carbon source is always in the optimal state. The metering pump 7 is a crucial execution component in the carbon source adding system, which is signal connected with the automatic control equipment 2 and directly controlled by the instruction of the automatic control equipment 2, and the design and function of the metering pump 7 ensure that it can transport carbon source with high precision and high controllability, accurately control the flow and adding amount of carbon source, and through the accurate control mechanism, carbon source can be transported into the sewage treatment tank in a constant and appropriate manner, and the actual needs in the sewage treatment process are met.

[0037] In addition, the system is provided with a standby pipeline 62, when the main conveying pipeline 61 fails or needs maintenance, the standby pipeline 62 can be used in time, and the continuous operation of the system is ensured. This not only improves the stability of the system, but also prevents the problem of inaccurate carbon source addition caused by interruption of addition, and further guarantees the overall accuracy of the system.

[0038] The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A carbon source dosing system for sewage treatment, comprising a nitrate sensor, an automatic control device and a carbon source dosing device connected together by signal control, characterized in that, The carbon source feeding device comprises at least one storage tank, a carbon source supply pipeline in communication with the storage tank, and a carbon source delivery pipe network in communication with the storage tank, wherein the carbon source delivery pipe network comprises a plurality of delivery pipelines and standby pipelines, the delivery pipelines are used for delivering the carbon source to a sewage treatment tank, the delivery pipelines and the standby pipelines each comprise a carbon source metering and delivery assembly, and the carbon source metering and delivery assembly comprises a metering pump in signal connection with the automatic control device.

2. The carbon source dosing system of claim 1, wherein, The carbon source metering and delivery assembly further comprises a switch valve, a pulse damper, a back pressure valve and a Y-shaped filter arranged at an input end of the metering pump, and a safety valve, a manual ball valve and a flow meter arranged at an output end of the metering pump.

3. The carbon source dosing system of claim 1, wherein, The bottom of the storage tank is provided with a liquid collecting groove, the carbon source delivery pipe network is in communication with the liquid collecting groove, and the top of the storage tank is further provided with a manhole, a feeding port, an overflow port, an exhaust port, a sampling port, a backflow port and an ultrasonic liquid level meter.

4. The carbon source dosing system of claim 1, wherein, The carbon source supply pipeline comprises at least two unloading pumps connected in parallel, the input end of each unloading pump is provided with a manual ball valve, the output end of each unloading pump is provided with a manual ball valve and a check valve, and the carbon source supply pipeline is further provided with an electromagnetic valve at a position in communication with the storage tank.

5. The carbon source dosing system of claim 1, wherein, Each of the delivery pipelines and the standby pipelines is in communication with each other through a connecting pipeline, and the connecting pipeline is provided with a switch valve.

6. The carbon source dosing system of claim 1, wherein, The delivery pipelines and the standby pipelines are further connected with reclaimed water input pipes, the reclaimed water input pipes are in communication with the input ends of the metering pumps, the reclaimed water input pipes are further provided with switch valves for controlling the on-off of the metering pumps, and the output ends of the metering pumps are each in communication with a drainage pipe.

7. The carbon source dosing system of claim 2, wherein, The storage tank is made of PE and has a wall thickness of not less than 26 mm, the metering pump is a hydraulic diaphragm metering pump, the pulse damper is a gas bag damper, and the Y-shaped filter is made of PVC. 8.The carbon source dosing system of claim 1, wherein The delivery pipelines and the standby pipelines are further provided with pressure gauges and flow meters.

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