Automatic disinfectant adding system for waterworks
By setting up an automatic dosing system in the tap water plant, monitoring the water quality in real time and automatically adjusting the amount of disinfectant dosage, the problem of inaccurate sterilization in the existing technology is solved, precise control of chloramine concentration is achieved, water quality and taste are improved, and water quality safety is ensured.
Patent Information
- Application Number
- CN202422068415.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-23
AI Technical Summary
In existing water treatment processes, the addition of disinfectant and ammonia sources is usually completed based on a predetermined schedule or manual operation, resulting in the amount of disinfectant added is not accurate enough to respond to changes in water quality in real time, which may lead to excessive chloramine concentration in the water, causing adverse odor and health risks.
Design a water plant automatic disinfectant injection system. By setting up a detection device at the inlet and outlet of the clean water tank, the chlorine and ammonia nitrogen content in the water is monitored in real time, and based on these data, the dosage of sodium hypochlorite and ammonium sulfate is automatically adjusted to ensure that the appropriate amount of chloramine is generated.
The precise addition of disinfectants is achieved, and it can respond to changes in water quality in real time, ensure that the chloramine concentration is within a safe range, improve the taste of drinking water and ensure the safety of water quality, reduce the need for manual intervention, and reduce the possibility of operational errors.
Smart Images
Figure CN223016613U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water treatment, and more specifically to the technical field of an automatic disinfectant dosing system for waterworks. Background Art
[0002] Currently, the commonly used disinfectants in the field of water treatment mainly include free chlorine, chlorine dioxide, ozone, and chloramine, etc. Among them, as an effective disinfectant, chloramine is widely used in the process of drinking water treatment because of its relatively long-lasting disinfection effect and low generation amount of disinfection by-products.
[0003] However, the generation and control of chloramine is a complex technical process. When free chlorine reacts with ammonia nitrogen in water, different types of chloramines will be formed, such as monochloramine (NH2Cl), dichloramine (HCl2N), and trichloramine (NCl3). Although chloramine can effectively reduce harmful substances such as trihalomethanes (THMs) generated during the disinfection process, if the chloramine concentration is too high, it may lead to unpleasant odors in the water and may have an adverse impact on human health.
[0004] In the existing water treatment process, the addition of disinfectant and ammonia source is usually completed based on a predetermined schedule or manual operation, which often results in inaccurate addition amount of disinfectant and cannot respond to the change of water quality in real time. Summary of the Utility Model
[0005] In view of the above technical limitations, the utility model aims to design an automatic disinfectant dosing system for waterworks, which can automatically monitor water quality parameters and automatically adjust the addition amounts of disinfectant and ammonia source according to these parameters, so as to achieve the optimal disinfection effect and the minimum generation amount of disinfection by-products, and improve the taste of water quality at the same time.
[0006] To achieve the above purpose, the utility model adopts the following technical solutions:
[0007] An automatic disinfectant dosing system for waterworks includes a flow meter, a first on-line ammonia nitrogen meter arranged at the front end of a clear water tank, a second on-line ammonia nitrogen meter arranged at the rear end of the clear water tank, an on-line total chlorine meter, an on-line free chlorine meter, and a sodium hypochlorite dosing pump capable of dosing sodium hypochlorite solution to the front end of the clear water tank;
[0008] It further includes an ammonium sulfate dosing pump, a rear input port where the ammonium sulfate dosing pump doses ammonium sulfate solution to the rear end of the clear water tank, and a front input port where the ammonium sulfate dosing pump doses ammonium sulfate solution to the front end of the clear water tank;
[0009] It further includes an automatic control system that sends a control output signal to the sodium hypochlorite dosing pump according to the input data of the flow meter, the first on-line ammonia nitrogen meter, the second on-line ammonia nitrogen meter, the on-line total chlorine meter, and the on-line free chlorine meter.
[0010] Thus, by installing detection devices at the inlet and outlet of the clear water tank, the chlorine and ammonia nitrogen contents in the water can be monitored in real time. Based on this data, the system can automatically adjust the dosages of sodium hypochlorite and ammonium sulfate. That is to say, the system can automatically adjust the dosages of sodium hypochlorite and ammonium sulfate to ensure the generation of an appropriate amount of chloramine, thereby improving the taste of the drinking water and ensuring water quality safety. At the same time, the automated design reduces the need for manual intervention and the possibility of operation errors.
[0011] In a preferred embodiment, the sodium hypochlorite dosing pump is arranged at the front end of the front input port.
[0012] In a preferred embodiment, the sodium hypochlorite dosing pump is arranged at the rear end of the first on-line ammonia nitrogen meter.
[0013] In a preferred embodiment, the rear input port is arranged at the front end of the second on-line ammonia nitrogen meter, on-line total chlorine meter and on-line free chlorine meter.
[0014] In a preferred embodiment, the on-line total chlorine meter and the on-line free chlorine meter are integrated detection devices. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of an automatic disinfectant dosing system for a waterworks in this case. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following further details the features of the present utility model and other related features through embodiments for the understanding of those skilled in the same industry:
[0017] Please refer to Figure 1 , an automatic disinfectant dosing system for a waterworks in this case is applied to the stage from when the filtered water enters the clear water tank to when it leaves the factory. In this case, the front end refers to the direction of the filtered water, that is, the direction in which the water flows in, and the rear end refers to the direction of the water leaving the factory, that is, the direction in which the water flows out.
[0018] First, a first on-line ammonia nitrogen meter is installed at the front end of the clear water tank, and an on-line total chlorine meter and an on-line free chlorine meter are installed at the rear end of the clear water tank to monitor the chlorine and ammonia nitrogen contents in the water in real time. Preferably, the on-line total chlorine meter and the on-line free chlorine meter are integrated detection devices, which can be DPD spectrophotometry or electrochemistry. For example, multiple sensor channels are set in one instrument, one channel is specifically used for measuring free chlorine, and the other is used for measuring total chlorine, which is not specifically limited herein.
[0019] To more accurately control the dosing amount, a flow meter is also included at the front end of the clear water tank to monitor the water flow in real time.
[0020] At the front end of the clear water tank, that is, between the clear water tank and the first on-line ammonia nitrogen meter, a sodium hypochlorite dosing pump for dosing sodium hypochlorite solution is provided. In this process, in addition to the oxidative disinfection of hypochlorous acid hydrolyzed from sodium hypochlorite, free chlorine (Cl) is also provided to react with the ammonia nitrogen existing in the water to form chloramine. Since the ammonia nitrogen in the water flow is the existing amount of the filtered water itself, its amount will be relatively small, that is, the generated chloramine will also be very small. Therefore, when there is no ammonia nitrogen supplement, the disinfection of the clear water tank in the water plant and the water leaving the factory mainly relies on the oxidative effect of hypochlorous acid.
[0021] As a dosing measure for ammonia nitrogen, it includes an ammonium sulfate dosing pump and a front-end input port and a rear-end input port. The ammonium sulfate dosing pump can input ammonium sulfate at the front end of the clear water tank through the front-end input port provided between the rear end of the first on-line ammonia nitrogen meter and the front end of the clear water tank.
[0022] In some embodiments, the ammonium sulfate dosing pump can input ammonium sulfate at the rear end of the clear water tank through the rear-end input port provided between the rear end of the clear water tank and the second on-line ammonia nitrogen meter.
[0023] During specific implementation, the dosing dose of ammonium sulfate is controlled according to the feedback data of the flow meter, the first on-line ammonia nitrogen meter, and the second on-line ammonia nitrogen meter.
[0024] When the pipeline of the water leaving the factory is long, relatively speaking, chloramine shows better continuous disinfection ability in the long-distance water transmission pipeline. This is mainly because chloramine is more stable in water, not easily decomposed, and can maintain an effective disinfection concentration in the pipeline for a long time.
[0025] Therefore, sodium hypochlorite reacts with ammonium sulfate to form chloramine. The reaction equation can be expressed as:
[0026] NaOCl+NH4+→NH2Cl+Na++OH-
[0027] In this process, sodium hypochlorite provides free chlorine (Cl), while ammonium sulfate provides ammonia (NH3), and chloramine is formed by the reaction of free chlorine and ammonia.
[0028] During operation, the ammonium sulfate dosing pump doses ammonium sulfate solution to the front end or the rear end of the clear water tank. Specifically, one ammonium sulfate dosing pump has two outputs, and the flow direction is controlled by an electric control valve or a pneumatic valve to select the front-end input port or the rear-end input port direction, which is a commonly used means in the industry and will not be elaborated here.
[0029] Preferably, the sodium hypochlorite dosing pump is arranged between the front input ports of the first on-line ammonia nitrogen meter and the ammonium sulfate dosing pump. Adding sodium hypochlorite first and then ammonium sulfate can ensure the effective formation of chloramine, reduce the formation of by-products, guarantee the disinfection effect and improve the water quality safety at the same time. Because the free chlorine in sodium hypochlorite reacts with ammonia in water relatively fast, adding sodium hypochlorite first allows the ammonia in water to react with the free chlorine first.
[0030] An automatic dosing system for disinfectants in a waterworks in this case further includes an automatic control system that sends a control output signal to the sodium hypochlorite dosing pump according to the input data of the first on-line ammonia nitrogen meter, the second on-line ammonia nitrogen meter, the flow meter, the on-line total chlorine meter and the on-line free chlorine meter.
[0031] For example, as an application example, sodium hypochlorite can be added alone to form a method of using chlorine disinfection both in the clear water tank and at the end of the water leaving the factory (municipal water supply network).
[0032] In another application example, on this basis, ammonium sulfate solution can also be added to the input port at the rear end of the ammonium sulfate dosing pump to form a method of mainly using chlorine disinfection in the clear water tank and using chloramine disinfection at the end of the water leaving the factory (municipal water supply network).
[0033] In another application example, a control output signal is sent to the front input ports of the sodium hypochlorite dosing pump and the ammonium sulfate dosing pump. By adding sodium hypochlorite and ammonium sulfate solution at the front end of the clear water tank, chloramine disinfection is used both in the clear water tank and at the end of the water leaving the factory (municipal water supply network).
[0034] In this way, by arranging detection devices at the front and rear ends of the clear water tank, the chlorine and ammonia nitrogen contents in the water can be monitored in real time, and based on these data, the system can automatically adjust the dosing amounts of sodium hypochlorite and ammonium sulfate. That is to say, the system can automatically adjust the dosing amounts of sodium hypochlorite and ammonium sulfate. According to production needs, the waterworks and the municipal water supply network can choose chlorine disinfection or chloramine disinfection, and ensure the stability of the disinfectant dosage, thereby improving the taste of the drinking water and guaranteeing the water quality safety. At the same time, the automated design reduces the need for manual intervention and reduces the possibility of operation errors.
[0035] For the convenience of description, the description of detection devices will be used in this case. The detection devices used in this embodiment refer to the flow meter, the first on-line ammonia nitrogen meter, the second on-line ammonia nitrogen meter, the on-line total chlorine meter and the on-line free chlorine meter.
[0036] As described above, what is protected in this case is an automatic dosing system for disinfectants in a waterworks. All technical solutions identical or similar to this case should be regarded as falling within the protection scope of this case.
Claims
1. A waterworks disinfectant automatic dosing system, characterized in that: It includes a flow meter arranged at the front end of the clean water tank, a first online ammonia nitrogen meter, a second online ammonia nitrogen meter arranged at the rear end of the clean water tank, an online total chlorine meter and an online free chlorine meter, and a sodium hypochlorite dosing pump capable of adding sodium hypochlorite solution to the front end of the clean water tank; It also includes an ammonium sulfate dosing pump, the ammonium sulfate dosing pump has a rear end inlet for dosing ammonium sulfate solution to the rear end of the clean water tank, and the ammonium sulfate dosing pump has a front end inlet for dosing ammonium sulfate solution to the front end of the clean water tank; It also includes an automatic control system that sends a control output signal to the sodium hypochlorite dosing pump according to input data from the flow meter, the first online ammonia nitrogen meter, the second online ammonia nitrogen meter, the online total chlorine meter and the online free chlorine meter.
2. The automatic disinfectant dosing system for a waterworks according to claim 1, characterized in that: The sodium hypochlorite dosing pump is arranged at the front end of the front end inlet.
3. The automatic disinfectant dosing system for a waterworks as claimed in claim 2, characterized in that: The sodium hypochlorite dosing pump is arranged at the rear end of the first online ammonia nitrogen meter.
4. The automatic disinfectant dosing system for a waterworks according to claim 1, characterized in that: The rear end inlet is arranged at the front end of the second online ammonia nitrogen meter, the online total chlorine meter and the online free chlorine meter.
5. The automatic disinfectant dosing system for a waterworks as claimed in claim 1, characterized in that: The online total chlorine meter and the online free chlorine meter are integrated detection devices.