Novel sewage regulation-accident automatic regulation and control system

Abstract

The utility model discloses a novel sewage regulation-accident automatic regulation and control system. Comprising an online monitoring system, an adjusting tank, an accident tank and a PLC control system, wherein water inlet pipes of the adjusting tank and the accident tank are connected with a sewage inlet pipe, and controlled valves are arranged on the water inlet pipes of the adjusting tank and the accident tank; the online monitoring system is used for monitoring the water quality of the sewage inlet pipe and outputting a monitoring result to the PLC control system; and the PLC control system outputs a control signal to the controlled valves on the water inlet pipes of the regulating tank and the accident tank according to a received result. According to the utility model, the inlet water quality is monitored through the inlet water on-line monitoring system, the water inlet electric valve switches of the regulating tank and the accident tank are controlled through the PLC control system, and the automation degree of accident response is higher. The water outlet of the adjusting tank is controlled by the combination of the water outlet adjusting weir gate and the overflow adjusting weir gate, so that the stability of the water outlet quantity is ensured, and a larger adjusting tank volume is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and more specifically, to a new sewage regulation - accident automatic control system. Background Technique

[0002] During the discharge process of industrial wastewater, it changes with the production status, and there are uneven water quality and unstable water volume. Especially when there are accidents in production or when there is a lot of rain, the water quality and water volume of the wastewater change even more. This kind of change will cause the abnormal operation of the wastewater treatment process, reduce the treatment effect, and cannot give full play to the design load of the treatment equipment. In order to make the treatment process work normally and not be affected by the change of peak wastewater flow or peak concentration, it is required that the wastewater has a relatively stable water volume and uniform water quality before treatment, and the water quality and water volume must be adjusted.

[0003] Currently, the traditional method is to set up a regulating tank and an accident tank separately. Referring to the "Design Code for Chemical Industry Wastewater Treatment and Reuse" (GB 50684 - 2011), the volume of the regulating tank should be determined according to the data of the influent water volume and water quality changes. When the data cannot be obtained, the volume of the regulating facility can be calculated based on the average hourly flow rate for 12 - 24 hours, and the volume of the accident tank can be calculated based on the average hourly flow rate for 8 - 12 hours. Accordingly, in actual engineering design, the volumes of the regulating tank and the accident tank are relatively large. On the one hand, the investment is large, and on the other hand, the large floor area restricts the general layout design of the sewage treatment facilities.

[0004] At the same time, in the current conventional design, the water outlet of the regulating tank uses a water pump to lift to achieve stable water outlet, and both the investment and operation costs are relatively high. In addition, due to the large change in water level, the operating working point of the lift pump changes continuously, and it is still impossible to achieve absolute uniform quantity, and it affects the service life of the lift pump. Currently, the accident tank mostly adopts a separate design, and the degree of automation of accident response is relatively low. When an accident is discovered, the sewage treatment system has been impacted more or less. Content of the Utility Model

[0005] In view of the above technical problems, the utility model provides a new sewage regulation - accident automatic control system.

[0006] To achieve the above purpose, the utility model provides a new sewage regulation - accident automatic control system, including an on - line monitoring system, a regulating tank, an accident tank, and a PLC control system; wherein, the inlet pipes of the regulating tank and the accident tank are connected to the sewage inlet pipe, and controlled valves are arranged on the inlet pipes of the regulating tank and the accident tank; the on - line monitoring system is used to monitor the water quality of the sewage inlet pipe and output the monitoring results to the PLC control system; the PLC control system outputs control signals to the controlled valves on the inlet pipes of the regulating tank and the accident tank according to the received results.

[0007] Furthermore, the online monitoring system samples the sewage in the sewage inlet pipe through a sampling pump; the waste liquid is discharged through a pipeline to the accident pool.

[0008] Furthermore, a mixer and a liquid level gauge are arranged in the regulating tank, and the signal of the liquid level gauge is fed back to the PLC control system.

[0009] Furthermore, an outlet regulating weir gate is arranged in the regulating tank, and the outlet water is connected to the next treatment unit.

[0010] Furthermore, an overflow regulating weir gate is arranged in the regulating tank, and the overflow sewage is discharged to the accident pool through a pipeline.

[0011] Furthermore, a mixer and a liquid level gauge are arranged in the accident pool, and the signal of the liquid level gauge is fed back to the PLC control system.

[0012] Furthermore, a lifting pump is arranged at the outlet of the accident pool, and the outlet of the lifting pump is lifted to the regulating tank through a pipeline.

[0013] Furthermore, an overflow inlet electric valve is arranged on the discharge pipeline of the overflow sewage.

[0014] Adopting the technical solution provided by the present utility model has the following beneficial effects:

[0015] (1) The present utility model monitors the influent water quality through the influent online monitoring system, and controls the opening and closing of the influent electric valves of the regulating tank and the accident pool through the PLC control system, and the degree of automation of accident response is relatively high.

[0016] (2) The outlet water of the regulating tank of the present utility model adopts a combined control of an outlet regulating weir gate and an overflow regulating weir gate to ensure the stability of the outlet water volume, and there is no need to set a relatively large regulating tank volume.

[0017] (3) The outlet water of the regulating tank of the present utility model does not need to be lifted by a water pump, and the operating cost is relatively low.

[0018] (4) The present utility model will greatly reduce the construction investment of the current conventional design, and at the same time greatly reduce the floor area. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic flow diagram of the present utility model.

[0020] Among them, 1 is an on-line monitoring system, 101 is a sampling pump; 2 is an adjustment tank, 201 is an electric valve for inlet water of the adjustment tank, 202 is a mixer in the adjustment tank, 203 is an outlet regulating weir gate, 204 is an overflow regulating weir gate, 205 is a liquid level gauge in the adjustment tank; 3 is an accident tank, 301 is an electric valve for inlet water of the accident tank, 302 is a mixer in the accident tank, 303 is an electric valve for overflow inlet water of the accident tank, 304 is a lift pump for the accident tank, 205 is a liquid level gauge for the accident tank; 4 is a PLC control system. Detailed implementation manners

[0021] The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0023] The terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] Embodiment 1

[0025] As Figure 1 shown, the novel sewage regulation-accident automatic control system proposed by the present utility model includes an on-line monitoring system 1, an adjustment tank 2, an accident tank 3, and a PLC control system 4.

[0026] Among them, the on-line monitoring system 1 samples and monitors indicators such as inlet COD, ammonia nitrogen, total nitrogen, total phosphorus, pH, etc. through the sampling pump 101, and discharges the waste sample liquid to the accident tank 3; the on-line monitoring system 1 feeds back the detection results to the PLC control system 4.

[0027] The inlet of the adjustment tank 2 is provided with an electric valve 201; the inlet of the accident tank 3 is provided with an electric valve 301;

[0028] The described PLC control system 4 includes an input module, a logic operation module, and an output module. The input module receives signals from external devices such as the online monitoring system 1, sensors, switches, buttons, etc., and processes the signals accordingly; the logic operation module performs logical operations on the processed signals; the output module sends control signals to external devices such as actuators, motors, valves, etc.

[0029] Embodiment 2

[0030] Based on the above embodiment, for the PLC control system 4, the sewage regulation - accident coupling control logic is as follows:

[0031] After being detected by the online monitoring system 1, if the influent water quality meets the design requirements, the inlet electric valve 201 of the regulation tank 2 is opened, the inlet electric valve 301 of the accident tank is closed, and the sewage enters the regulation tank 2;

[0032] If the influent water quality does not meet the design requirements, the inlet electric valve 201 of the regulation tank is closed, the inlet electric valve 301 of the accident tank is opened, and the sewage enters the accident tank 3.

[0033] Embodiment 3

[0034] Based on the above embodiment, a mixer 202 and a liquid level gauge 205 are arranged inside the regulation tank 2, and the signal of the liquid level gauge 205 is fed back to the PLC control system 4.

[0035] Embodiment 4

[0036] Based on the above embodiment, the regulation tank 2 is provided with an outlet regulating weir gate 203, and the outlet is connected to the next treatment unit.

[0037] Embodiment 5

[0038] Based on the above embodiment, the regulation tank 2 is provided with an overflow regulating weir gate 204, and the overflow sewage is connected to the accident tank 3.

[0039] Embodiment 6

[0040] Based on the above embodiment, the inlet of the accident tank 3 is provided with an electric valve 301, and a mixer 302 is arranged inside the accident tank 3; a liquid level gauge is also arranged inside the accident tank 3, and the signal is fed back to the PLC control system;

[0041] Embodiment 7

[0042] Based on the above embodiment, a lift pump 304 is arranged at the outlet of the accident tank 3 to lift the sewage to the regulation tank 2;

[0043] Embodiment 8

[0044] Based on the above embodiment, the accident tank 3 is provided with an overflow inlet electric valve 303.

[0045] Example 8

[0046] Based on the above embodiments, for the PLC control system 4, the sewage regulation - accident coupling control logic further includes:

[0047] Water volume control

[0048] According to the water level Z of the regulating tank 2 0 and the opening height Z of the outlet regulating weir gate 203 1 , calculate the outlet water flow rate.

[0049] (Designed according to a non - submerged rectangular weir)

[0050] Wherein, m is the flow coefficient, b is the weir width, and H = Z 0 - Z 1 is the head above the weir (Z 1 needs to satisfy being greater than the design water level of the next treatment unit + head loss).

[0051] 1) When the outlet water flow rate is greater than the designed water volume, lower the height Z 2 of the overflow regulating weir gate 204 to make the outlet water flow rate equal to the designed water volume;

[0052] 2) When the outlet water flow rate is less than the designed water volume, raise the height Z 2 of the overflow regulating weir gate 204 to make the outlet water flow rate equal to the designed water volume;

[0053] 3) When the overflow regulating weir gate 204 is completely closed and the outlet water flow rate is still less than the designed water volume, it indicates that the influent water flow rate is less than the designed water volume. At this time, start the accident pool lift pump 304 to back - fill the peak overflow volume to ensure the stability of the water output from the regulating tank 2.

[0054] It should be noted that the above - mentioned part only represents the possible specific embodiments of the present utility model and should not be regarded as a limitation. For example, necessary valve parts must be installed in all connecting pipes; all PLC control execution units, such as valves and weir gates, can be electric or pneumatic; the monitored indicators of the online monitoring system are not limited to the mentioned indicators; the outlet regulating weir gate and the overflow regulating weir gate can be designed in other forms. Therefore, the present utility model is not limited to the possible specific embodiments, and various changes can be made without departing from the purpose of the present utility model within the knowledge scope of ordinary technical personnel in the field. Many other changes and modifications made without departing from the concept and scope of the present utility model should be regarded as within the protection scope of the present utility model.

[0055] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0056] In the description of this specification, the specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0057] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model can easily think of changes or substitutions, which should all be covered by the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claimed rights.

Claims

1. A new type of sewage regulation-accident automatic control system, characterized in that: It includes an online monitoring system, a regulating tank, an accident tank, and a PLC control system; wherein the water inlet pipes of the regulating tank and the accident tank are connected to the sewage inlet pipe, and controlled valves are arranged on the water inlet pipes of the regulating tank and the accident tank; the online monitoring system is used to monitor the water quality of the sewage inlet pipe and output the monitoring results to the PLC control system; the PLC control system outputs control signals to the controlled valves on the water inlet pipes of the regulating tank and the accident tank according to the received results.

2. The novel sewage regulation-accident automatic control system as claimed in claim 1 is characterized in that: The online monitoring system samples the sewage in the sewage inlet pipe through a sampling pump; the waste sample liquid is discharged to the accident pool through a pipeline.

3. The novel sewage regulation-accident automatic control system as claimed in claim 1 is characterized in that: A stirrer and a liquid level meter are arranged in the regulating tank, and the signal of the liquid level meter is fed back to the PLC control system.

4. The novel sewage regulation-accident automatic control system as claimed in claim 1 is characterized in that: The regulating pool is provided with a water outlet regulating weir gate, and the water outlet is connected to the next processing unit.

5. The novel sewage regulation-accident automatic control system as claimed in claim 1 is characterized in that: The regulating pool is provided with an overflow regulating weir gate, and the overflow sewage is discharged to the accident pool through a pipeline.

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