Intelligent dosing module for sewage treatment system

Abstract

The invention relates to an intelligent dosing module for a sewage treatment system, the intelligent dosing module comprises a sewage treatment system and an intelligent dosing module, the sewage treatment system comprises an anoxic tank, an aerobic tank and an MBR tank which are connected in sequence; the intelligent dosing module comprises a medicament storage unit, a water quality and quantity monitoring unit, a PLC (Programmable Logic Controller) and a dosing execution unit. A PLC is adopted in the control unit, an intelligent algorithm based on logic control is preset in the control unit, the water quality and water quantity monitoring unit collects water quantity and water quality parameters such as COD, ammonia nitrogen, total nitrogen and total phosphorus in real time and transmits the water quality parameters to the PLC, the PLC calculates the dosage of a carbon source and a phosphorus removal agent according to the preset algorithm and process requirements, an instruction is issued to the agent adding execution unit, and the agent adding execution unit is controlled to execute the agent adding operation. The dosing execution unit is used for precisely dosing by means of a metering pump and an electric control valve, real-time adjustment is carried out through data fed back by a pressure sensor and a flow meter, and the PLC is further connected with a remote monitoring center, so that the remote monitoring function is realized, the high efficiency and the accuracy of sewage treatment are guaranteed, and the effluent quality reaches the standard.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to an intelligent chemical dosing module for a sewage treatment system. Background Art

[0002] In the field of sewage treatment, the AO+MBR system, which combines the AO (anoxic-aerobic) process with the MBR (membrane bioreactor) technology, has been widely adopted. This combination not only effectively removes pollutants such as organic matter, nitrogen, and phosphorus in sewage, but also meets relatively high sewage treatment standards. To ensure the normal progress of microbial metabolic activities and the high efficiency of the denitrification and phosphorus removal process, it is usually necessary to add appropriate amounts of carbon sources and phosphorus-removing chemical agents to this system.

[0003] However, in traditional operations, whether it is manual chemical dosing or an automated chemical dosing method based on fixed time intervals and preset dosages, it is difficult to meet the requirements of modern sewage treatment. The former has problems such as low accuracy, high labor intensity, and slow response; the latter lacks flexibility, cannot respond in a timely manner to changes in water quality and quantity, and is prone to improper use of chemical agents, either too much or too little, which in turn affects the treatment effect and cost control.

[0004] With the development of the intelligent and refined trend in the water treatment industry and the continuous improvement of the requirements for effluent quality, the development of an intelligent chemical dosing module has become particularly crucial. This advanced solution can monitor and adapt to changes in the system state in real time, and automatically adjust the quantity of chemical agents required according to the actual water quality and quantity conditions. It can accurately dispense chemical agents, avoid waste and over-dosing, thereby improving the treatment efficiency and ensuring the compliance of the effluent. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems. The present application proposes an intelligent chemical dosing module for a sewage treatment system, which is provided with a PLC and sensors, valves, etc. connected thereto, and can monitor the sewage volume and water quality parameters in real time, and automatically and accurately control the addition amounts of carbon sources and phosphorus-removing chemical agents according to their changes, improve the sewage treatment effect, and reduce the chemical agent consumption and treatment cost.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: An intelligent chemical dosing module for a sewage treatment system, including a sewage treatment system and an intelligent chemical dosing module. The sewage treatment system includes an anoxic tank, an aerobic tank, and an MBR tank connected in sequence. An aeration and agitation system is provided in the anoxic tank, an aeration system is provided in the aerobic tank, and an MBR membrane module is provided in the MBR tank. The anoxic tank is externally connected to a biochemical tank inlet pipe, and a biochemical tank inlet flowmeter provided on the biochemical tank inlet pipe is connected to the PLC through a signal transmission line. The intelligent chemical dosing module includes a chemical agent storage unit, a water quality and quantity monitoring unit, a PLC, and a chemical dosing execution unit; The reagent storage unit includes a carbon source storage tank and a phosphorus removal reagent storage tank. Stirring and mixing devices are provided in both the carbon source storage tank and the phosphorus removal reagent storage tank. The carbon source storage tank and the phosphorus removal reagent storage tank are both equipped with liquid level sensors and are connected to the PLC. The water quality and quantity monitoring unit includes an online water inlet quality monitoring system and an online water outlet quality monitoring system connected to the PLC. The dosing execution unit includes metering pumps, dosing pipes, dosing pipe flow meters, dosing pipe electric control valves, dosing pipe dampers, dosing pipe back pressure valves, dosing pipe pressure relief valves, dosing pipe ball valves, and pressure sensors.

[0007] Further: One end of the dosing pipe is installed into the anoxic tank, and the other end is divided into two paths and installed into the carbon source storage tank and the phosphorus removal reagent storage tank respectively. Dosing pipe flow meters, dosing pipe electric control valves, dosing pipe dampers, dosing pipe back pressure valves, dosing pipe pressure relief valves, dosing pipe ball valves, and pressure sensors connected to the PLC through signal transmission lines are provided on the dosing pipes near the carbon source storage tank and the phosphorus removal reagent storage tank within the intelligent dosing module.

[0008] Further: Tap water is connected to the outside of the carbon source storage tank and the phosphorus removal reagent storage tank through a tap water pipe. A tap water pipe electric control valve connected to the PLC through a signal transmission line is provided on the tap water pipe.

[0009] Further: A Y-shaped filter is provided at the position near the water outlet ends of the carbon source storage tank and the phosphorus removal reagent storage tank on the dosing pipe.

[0010] Further: An intelligent algorithm based on logic control is preset in the PLC.

[0011] Further: The PLC is connected to a remote monitoring center through wireless communication.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: The control unit of the present invention uses a PLC, and an intelligent algorithm based on logic control is preset inside. The water quality and quantity monitoring unit collects water quantity and water quality parameters such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in real time and transmits them to the PLC. The PLC calculates the dosages of the carbon source and the phosphorus removal reagent according to the preset algorithm and process requirements, issues instructions to the dosing execution unit, and the dosing execution unit accurately doses with the help of metering pumps and electric control valves, and makes real-time adjustments based on the data fed back by the pressure sensors and flow meters.

[0013] Liquid level sensors are provided in both the carbon source storage tank and the phosphorus removal reagent storage tank to monitor the reagent inventory. An alarm is given when the liquid level is low. The stirring and mixing devices provided in the storage tanks enable the reagents to be evenly dispersed, enhancing the reaction effect between the reagents and the sewage.

[0014] The PLC is also connected to the remote monitoring center through wireless communication to achieve remote monitoring functions, enabling remote operation and management to ensure the high efficiency, accuracy of sewage treatment and the compliance of the effluent water quality. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only for more clearly illustrating the technical solutions in the embodiments of the present invention or the prior art. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure: 1 - anoxic tank, 2 - aerobic tank, 3 - MBR membrane tank, 4 - stirring and mixing device, 5 - chemical agent storage unit, 6 - liquid level sensor, 7 - biochemical tank influent flowmeter, 8 - chemical dosing pipe flowmeter, 9 - chemical dosing pipe electric control valve, 10 - chemical dosing pipe damper, 11 - chemical dosing pipe back pressure valve, 12 - chemical dosing pipe pressure relief valve, 13 - chemical dosing pipe ball valve, 14 - biochemical tank influent pipe, 15 - chemical dosing pipe, 16 - signal transmission line, 17 - tap water pipe electric control valve, 18 - PLC, 19 - effluent water quality on-line monitoring system, 20 - influent water quality monitoring system, 21 - aeration and stirring system, 22 - aeration system, 23 - MBR membrane module, 24 - pressure sensor, 25 - Y-type filter, 26 - metering pump. Detailed Embodiments

[0017] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the following further illustrates the present invention with specific embodiments. However, the specific embodiments cited are only for the illustration of the present invention and not for the limitation of the present invention.

[0018] As Figure 1 shown, an intelligent chemical dosing module for a sewage treatment system includes a sewage treatment system and an intelligent chemical dosing module. The sewage treatment system includes an anoxic tank 1, an aerobic tank 2, and an MBR tank 3 connected in sequence. An aeration and stirring system 21 is provided in the anoxic tank 1, an aeration system 22 is provided in the aerobic tank 2, and an MBR membrane module 23 is provided in the MBR tank 3. The anoxic tank 1 is externally connected to a biochemical tank influent pipe 14, and a biochemical tank influent flowmeter 7 provided on the biochemical tank influent pipe 14 is connected to the PLC 18 through a signal transmission line 16; The intelligent chemical dosing module includes a chemical storage unit 5, a water quality and quantity monitoring unit, a PLC 18, a chemical dosing execution unit, etc. The chemical storage unit 5 includes a carbon source storage tank and a phosphorus removal chemical storage tank. A stirring and mixing device 4 is provided in both the carbon source storage tank and the phosphorus removal chemical storage tank. The carbon source storage tank and the phosphorus removal chemical storage tank are both provided with liquid level sensors 6 and are connected to the PLC. The water quality and quantity monitoring unit includes an influent water quality online monitoring system 20 and an effluent water quality online monitoring system 19 connected to the PLC 18. The chemical dosing execution unit includes a metering pump 26 and a chemical dosing pipe 15. One end of the chemical dosing pipe 15 is installed into the anoxic tank 15, and the other end is divided into two paths and installed into the carbon source storage tank and the phosphorus removal chemical storage tank respectively. On the chemical dosing pipe 15 near the carbon source storage tank and the phosphorus removal chemical storage tank within the intelligent chemical dosing module, there are a chemical dosing pipe flowmeter 8, a chemical dosing pipe electric control valve 9, a chemical dosing pipe damper 10, a chemical dosing pipe back pressure valve 11, a chemical dosing pipe pressure relief valve 12, a chemical dosing pipe ball valve 13, and a pressure sensor 24, all of which are connected to the PLC 18 through a signal transmission line 16. A Y-type filter 25 is also provided at the position near the water outlet ends of the carbon source storage tank and the phosphorus removal chemical storage tank on the chemical dosing pipe 15.

[0019] The carbon source storage tank and the phosphorus removal chemical storage tank are connected to tap water through a tap water pipe, and a tap water pipe electric control valve 17 connected to the PLC 18 through a signal transmission line 16 is provided on the tap water pipe.

[0020] An intelligent algorithm based on logic control is preset in the PLC 18. This algorithm can comprehensively consider factors such as influent water quality, water quantity, the metabolic state of microorganisms in the biochemical reaction tank, effluent water quality requirements, and the historical data of system operation, and dynamically adjust the dosing amounts of the carbon source and the phosphorus removal chemical. For example, when the influent COD content is low and the ammonia nitrogen content is high, the algorithm determines that the carbon source in the system is insufficient and needs to increase the dosing amount of the carbon source to promote the denitrification reaction; when the total phosphorus content in the biochemical reaction tank exceeds the set threshold, the algorithm automatically increases the dosing amount of the phosphorus removal chemical.

[0021] The PLC 18 is connected to a remote monitoring center through wireless communication. Staff can view in real time information such as the operation status of the intelligent chemical dosing module, water quality monitoring data, and chemical dosing records in the remote monitoring center. At the same time, the remote monitoring center can also send control instructions to the PLC 18 to perform remote operation and parameter adjustment on the intelligent chemical dosing module, realizing intelligent remote management.

[0022] Working principle Use the influent flowmeter of the biochemical tank, the online effluent water quality monitoring system, and the influent water quality monitoring system to detect in real time the influent flow rate and the water quality parameters (such as COD, ammonia nitrogen, total nitrogen, total phosphorus, etc.) of the influent and effluent entering the "AO + MBR sewage treatment system", and transmit the data to the PLC. The PLC receives the data and analyzes the data information through the internally preset algorithm. Based on the logic control and historical data, the PLC dynamically adjusts the demand for carbon source and phosphorus removal agents to meet the specific requirements of the sewage treatment process; After the PLC calculates the required dosage of the agent, it sends a clear control instruction to the dosing execution unit. The metering pump controls the flow rate through frequency conversion according to the received instruction information, and at the same time adjusts the electric control valve of the dosing pipe, precisely extracts and transports an appropriate amount of carbon source or phosphorus removal agent from the agent storage unit: carbon source storage tank or phosphorus removal agent storage tank, and transports it to the designated position of the sewage treatment system through the dosing pipe. During the dosing process, the dosing pipe flowmeter and pressure sensor set on the dosing pipe monitor the dosing flow rate and the pressure in the dosing pipeline in real time, and feedback the data to the PLC. The PLC monitors and adjusts the dosing process in real time according to the feedback data to ensure the accuracy and stability of dosing. At the same time, the liquid level sensor monitors the liquid level of the agent in the carbon source storage tank or phosphorus removal agent storage tank in real time. When the liquid level is lower than the set lower limit value, the PLC issues an alarm to remind the staff to replenish the agent, and at the same time opens the electric control valve of the tap water pipe to replenish tap water.

[0023] Since the PLC is connected to the remote monitoring center through wireless communication, the staff can also view in real time information such as the operating status of the intelligent dosing module, the water quality monitoring data, and the dosing records through the remote monitoring center. If parameter adjustment or remote operation of the dosing module is required, control instructions can be sent to the PLC end through the remote monitoring center.

[0024] The content not described in detail in the present invention is prior art.

[0025] It should be noted that the content described above constitutes the present invention. Without departing from the technical principle of the present application, those skilled in the art can combine the technical solutions in the above embodiments, or make equivalent changes or replacements to the relevant technical features. Any changes and equivalent replacements made within the technical concept and / or technical principle of the present application will fall within the protection scope of the present application.

Claims

1. An intelligent chemical dosing module for a sewage treatment system, comprising a sewage treatment system and an intelligent chemical dosing module. The sewage treatment system includes an anoxic tank (1), an aerobic tank (2), and an MBR tank (3) connected in sequence. An aeration and agitation system (21) is provided in the anoxic tank (1), an aeration system (22) is provided in the aerobic tank (2), and an MBR membrane module (23) is provided in the MBR tank (3). The anoxic tank (1) is externally connected to a biochemical tank inlet pipe (14), and a biochemical tank inlet flowmeter (7) provided on the biochemical tank inlet pipe (14) is connected to a PLC (18) through a signal transmission line (16). It is characterized in that: The intelligent chemical dosing module includes a chemical storage unit (5), a water quality and quantity monitoring unit, a PLC (18), and a chemical dosing execution unit; The chemical storage unit (5) includes a carbon source storage tank and a phosphorus removal chemical storage tank. Stirring and mixing devices (4) are provided in both the carbon source storage tank and the phosphorus removal chemical storage tank. Liquid level sensors (6) are provided in both the carbon source storage tank and the phosphorus removal chemical storage tank and are connected to the PLC. The water quality and quantity monitoring unit includes an influent water quality on-line monitoring system (20) and an effluent water quality on-line monitoring system (19) connected to the PLC (18). The chemical dosing execution unit includes metering pumps (26), chemical dosing pipes (15), chemical dosing pipe flow meters (8), chemical dosing pipe electric control valves (9), chemical dosing pipe dampers (10), chemical dosing pipe back pressure valves (11), chemical dosing pipe pressure relief valves (12), chemical dosing pipe ball valves (13), and pressure sensors (24).

2. The intelligent chemical dosing module for a sewage treatment system according to claim 1, characterized in that: One end of the chemical dosing pipe (15) is installed into the anoxic tank (15), and the other end is divided into two paths and installed into the carbon source storage tank and the phosphorus removal chemical storage tank respectively. Chemical dosing pipe flow meters (8), chemical dosing pipe electric control valves (9), chemical dosing pipe dampers (10), chemical dosing pipe back pressure valves (11), chemical dosing pipe pressure relief valves (12), chemical dosing pipe ball valves (13), and pressure sensors (24) connected to the PLC (18) through signal transmission lines (16) are provided on the chemical dosing pipes (15) near the carbon source storage tank and the phosphorus removal chemical storage tank within the intelligent chemical dosing module.

3. The intelligent chemical dosing module for a sewage treatment system according to claim 1, characterized in that: The carbon source storage tank and the phosphorus removal chemical storage tank are connected to tap water through tap water pipes, and tap water pipe electric control valves (17) connected to the PLC (18) through signal transmission lines (16) are provided on the tap water pipes.

4. The intelligent chemical dosing module for a sewage treatment system according to claim 1, characterized in that: Y-type filters (25) are provided at positions near the water outlet ends of the carbon source storage tank and the phosphorus removal chemical storage tank on the chemical dosing pipe (15).

5. The intelligent chemical dosing module for a sewage treatment system according to claim 1, characterized in that: An intelligent algorithm based on logic control is preset in the PLC (18).

6. The intelligent chemical dosing module for a sewage treatment system according to claim 1, characterized in that: The PLC (18) is connected to a remote monitoring center through wireless communication.

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