A PLC control system for sewage treatment based on flat ceramic membrane circular equipment

Abstract

The utility model discloses a sewage treatment PLC control system based on a flat ceramic membrane circular equipment, including an oxidation ditch reaction tank, a main PLC controller, a sensor and a pump group. The oxidation ditch reaction tank is circular, with four ceramic membrane tanks, a sludge return area and a water distribution area in the middle. The four ceramic membrane tanks are all equipped with a flat nano ceramic membrane reactor, an aeration device and a membrane tank level meter. A circular oxidation ditch is arranged around it. The oxidation ditch is provided with an oxidation-reduction potential meter, a dissolved oxygen detector and a sludge concentration meter. The oxidation ditch is provided with an oxidation ditch inlet end and an oxidation ditch outlet end. The oxidation ditch is divided into an anaerobic zone, an anoxic zone and an aerobic zone. The anaerobic zone, the anoxic zone and the aerobic zone are all provided with a flow pusher. The advantages of the utility model compared with the prior art are: the control system of the utility model adopts one-button automatic, is easy to use, occupies a small area, saves energy and consumption, and the effluent water quality is stable and up to standard, which effectively solves the defects of traditional process technology.

Description

Technical Field

[0001] The utility model relates to a sewage treatment control system, in particular to a sewage treatment PLC control system based on flat ceramic membrane circular equipment. Background Art

[0002] In recent years, the amount of urban domestic sewage discharge has continued to increase; at the same time, with the continuous improvement of ecological environment quality standards, the requirements for the effluent quality of urban sewage treatment plants have become increasingly stringent. This has also promoted the continuous development of domestic sewage treatment plants in terms of technology and processes. Traditional domestic sewage treatment plants use microbial methods to degrade organic matter and remove nitrogen and phosphorus, which can stabilize the process operation effect; with the improvement of emission standards, it is difficult for traditional sewage treatment plant microbial processes to meet the requirements for total nitrogen in effluent. Therefore, the development of a sewage treatment PLC control system based on flat ceramic membrane circular equipment has become an urgent problem to be solved by technicians in this field. Utility Model Content

[0003] The utility model is to solve the above-mentioned deficiencies and provides a sewage treatment PLC control system based on a flat ceramic membrane circular equipment.

[0004] The above-mentioned purpose of the utility model is achieved through the following technical solutions: a sewage treatment PLC control system based on flat ceramic membrane circular equipment, including an oxidation ditch reaction tank, a main PLC controller, a sensor and a pump group, the oxidation ditch reaction tank is circular, and four ceramic membrane tanks, a sludge return zone and a water distribution zone are arranged in the middle, and the four ceramic membrane tanks are all equipped with flat nano-ceramic membrane reactors, aeration devices and membrane tank liquid level meters, and an annular oxidation ditch is arranged around, and an oxidation reduction potential meter, a dissolved oxygen detector and a sludge concentration meter are arranged in the oxidation ditch, and an oxidation ditch is provided with an oxidation ditch water inlet end and an oxidation ditch water outlet end, and the oxidation ditch is divided into an anaerobic zone, an anoxic zone and an aerobic zone, and the anaerobic zone, the anoxic zone and the aerobic zone are all provided with flow pushers, and the oxidation ditch outlet end is connected to the sludge return zone. The sludge return area is provided with a sludge return pump and a sludge discharge pump, and the sludge discharge pump is connected to the sludge disposal equipment; the four ceramic membrane pools are respectively provided with inlet / outlet gates, the sludge return area is connected to the water inlets of the four ceramic membrane pools, the flat nano-ceramic membrane reactor in the ceramic membrane pool is connected to the main pipe through a branch pipe, the main pipe is connected to the water production pump and the backwash pump, the water production pump and the backwash pump outlet pipe are then connected to the ultraviolet disinfection equipment, a water production pressure gauge is provided on the pipeline between the water production pump and the flat nano-ceramic membrane reactor, a water production flowmeter and a gas / electric valve are provided on the pipeline between the water production pump and the ultraviolet disinfection equipment, the aeration device is connected to the fan in the equipment room through a pipeline; a drug washing pump is connected to the backwash pump pipeline, and the drug washing pump is connected to the drug washing system.

[0005] Furthermore, the main PLC controller is connected to the distributed PLC controller, the touch screen operation panel, and the computer host operation station respectively, and the distributed PLC controller is connected to the redox potential meter, the dissolved oxygen detector, the sludge concentration meter, the membrane pool level meter, the water production pressure meter, the water production flow meter, the inverter, the gas / electric valve, the inlet / outlet gate, the mud pump, the chemical washing pump, and the flow pusher, and the inverter is connected to the water production pump, the backwash pump, and the sludge return pump to automatically adjust the water flow of the water production pump, the backwash pump, and the sludge return pump. The inverter is an ABB ACS510 series inverter.

[0006] Furthermore, the main PLC controller is a Siemens S7-1200 series PLC, the distributed PLC controller is a Siemens distributed controller of the EP200 series, the touch screen operation panel is the Weiluntong MT8102 series, and the computer host operation station is a Siemens WINCC configuration software series.

[0007] Furthermore, the redox potential meter, dissolved oxygen detector and sludge concentration meter are respectively arranged on both sides of the anoxic zone, facultative anoxic zone and aerobic zone of the oxidation ditch.

[0008] Furthermore, the four ceramic membrane pools are integrated nano-ceramic membrane device pools.

[0009] Furthermore, the water production pump, backwash pump, chemical wash pump and fan are all distributed in the equipment room.

[0010] Furthermore, an electric opening regulating valve and an air volume flow meter are provided on the connecting pipeline between the aeration device and the fan.

[0011] Compared with the prior art, the utility model has the following advantages: the control system of the utility model adopts one-button automatic operation, is easy to use, occupies a small area, saves energy and consumption, and the effluent water quality is stable and up to standard, which effectively solves the defects of traditional process technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the control system structure of the utility model.

[0013] Figure 2 It is a structural block diagram of the control system of the utility model.

[0014] Figure 3 It is a schematic diagram of a PLC controller of the utility model. DETAILED DESCRIPTION

[0015] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0016] like Figure 1 , Figure 2 and Figure 3As shown, a PLC control system for sewage treatment based on a circular flat ceramic membrane equipment includes an oxidation ditch reaction tank 21, a main PLC controller 2, a sensor and a pump group. The oxidation ditch reaction tank 21 is circular, and four ceramic membrane tanks 21-1, a sludge return area 21-4 and a water distribution area 21-5 are arranged in the middle. The four ceramic membrane tanks constitute an integrated nano-ceramic membrane device tank. The four ceramic membrane tanks 21-1 are all equipped with a flat nano-ceramic membrane reactor 22, an aeration device 25 and a membrane tank liquid level meter 6. An annular oxidation ditch 29 is arranged around it. The oxidation ditch 29 is provided with a redox potential meter 3, a dissolved oxygen detector 4, and a sludge concentration meter 5. The redox potential meter 3, the dissolved oxygen detector 4 and the sludge concentration meter 5 are respectively arranged on both sides of the anoxic zone, the facultative anoxic zone and the aerobic zone of the oxidation ditch 29. The oxidation ditch 29 is provided with an oxidation ditch water inlet 21-2 and an oxidation ditch water outlet 21-3. The oxidation ditch 29 is divided into an anaerobic zone, an anoxic zone and an aerobic zone. The anaerobic zone, the anoxic zone and the aerobic zone are all provided with flow pushers 15. The oxidation ditch water outlet 21-3 is connected to the sludge return zone 21-4. The sludge return zone 21-4 is provided with a sludge return pump 16 and a sludge pump 13. The sludge pump 13 is connected to the sludge disposal equipment; the four ceramic membrane pools 21-1 are respectively provided with inlet / outlet gates 12. The sludge return zone 21-4 is connected to the water inlets of the four ceramic membrane pools 21-1. The flat nano-ceramic membrane reactor 22 in the ceramic membrane pool 21-1 is connected to the main pipe through a branch pipe 23 24, the main pipe 24 is connected to the water production pump 19 and the backwash pump 20 between the equipment, and the outlet pipes of the water production pump 19 and the backwash pump 20 are further connected to the ultraviolet disinfection equipment 26, and a water production pressure gauge 7 is arranged on the pipeline between the water production pump 19 and the flat nano-ceramic membrane reactor 22, and a water production flowmeter 8 and a gas / electric valve 11 are arranged on the pipeline between the water production pump 19 and the ultraviolet disinfection equipment 26, and the aeration device 25 is connected to the fan 17 in the equipment room through a pipeline, and an electric opening regulating valve 27 and an air volume flowmeter 28 are arranged on the connecting pipeline between the aeration device 25 and the fan 17; the backwash pump 20 pipeline is connected to the drug washing pump 14 in the equipment room, and the drug washing pump 14 is connected to the drug washing system.

[0017] The main PLC controller 2 is connected to the distributed PLC controller 18, the touch screen operation panel 9, and the computer host operation station 1 respectively. The distributed PLC controller 18 is connected to the redox potential meter 3, the dissolved oxygen detector 4, the sludge concentration meter 5, the membrane pool level meter 6, the water production pressure meter 7, the water production flow meter 8, the inverter 10, the gas / electric valve 11, the inlet / outlet gate 12, the mud pump 13, the drug washing pump 14, and the flow pusher 15. The inverter 10 is connected to the water production pump 19, the backwash pump 20 and the sludge return pump 16, and is used to automatically adjust the water flow of the water production pump 19, the backwash pump 20 and the sludge return pump 16. The inverter is an ACS510 series inverter of ABB.

[0018] In this embodiment, the redox potential meter 3, dissolved oxygen detector 4 and sludge concentration meter 5 are respectively arranged in the anoxic zone, facultative anaerobic zone and aerobic zone of the oxidation ditch. The PLC controller 2 accurately controls the system by detecting the redox points and dissolved oxygen meter, sludge concentration meter 5 and other instrument parameters in each zone to form a complete model algorithm to control the air volume in the facultative anaerobic zone, realize facultative nitrification-denitrification, and reduce phosphate to remove phosphine-like gaseous substances.

[0019] In this embodiment, the membrane pool level meter 9 is distributed in four ceramic membrane pools 21-1, and the high and low liquid levels of the membrane pools are set on the touch screen 9 or the computer operation screen to control the start and stop of the membrane water production system. If the liquid level of a membrane pool is higher than the high liquid level set for the group of membrane pools, the water production pump 19 and the water production valve of the group are turned on, and the valve is opened first in the process, and the water production pump 19 is turned on after a certain interval; if the liquid level of the membrane pool is lower than the low liquid level set for the group of membrane pools, the water production pump 19 and the gas / electric valve (water production valve) 11 of the group are stopped. In this process, the water production pump 19 is turned off first, and the gas / electric valve (water production valve) 11 is closed after a certain interval.

[0020] In this embodiment, the water production pressure gauge 7 is distributed on the branch pipeline of the membrane water production pipeline, and is used to detect the suction pressure difference during the water production process of the ceramic membrane. If the pressure difference detection data of a group of membranes is greater than the pressure difference setting alarm value and the process is delayed for a certain time, the system will issue an alarm command to inform the operating personnel to perform chemical washing; if the pressure difference detection data is greater than the pressure difference setting listening mechanism and the process is delayed for a certain time, the PLC control system will automatically stop the operation of the reorganized membrane and issue a first-level alarm command.

[0021] like Figure 2 As shown, the working principle of the utility model is: the water after treatment by the raw water grid system is retained at the water inlet end of the integrated nano-ceramic membrane equipped oxidation ditch, and the water is retained in the oxidation ditch of the flat ceramic membrane integrated device. The oxidation ditch includes an anaerobic zone, an anoxic zone and an aerobic zone. The water with a high nitrogen content is digested and denitrified, and the sludge is denitrified and phosphorus removed. Four groups of nano-reaction membrane devices are arranged in the middle of the ceramic membrane integrated device tank body. The water production pump 19 filters the ceramic membrane water through a pipeline and enters the ultraviolet disinfection device, and then meets the discharge standard after ultraviolet light disinfection.

[0022] The ceramic membrane pool is provided with an oxidation-reduction potential meter 3, a dissolved oxygen detector 4, and a sludge concentration meter 5 for measuring sewage parameters. The oxidation-reduction point, oxygen content, sludge concentration and other parameters collected by the oxidation-reduction potential meter 3, the dissolved oxygen detector 4, and the sludge concentration meter 5 are comprehensively analyzed by the PLC controller 2, and then the frequency of the aeration fan 17 is controlled, thereby controlling the aeration volume in the aeration tank, and realizing real-time detection and precise control of the parameters of sewage treatment in the aeration tank, so as to improve the digestion and denitrification, and achieve the effect of phosphorus removal and nitrogen removal. At the same time, the PLC controller 2 can realize the frequency control of the motor of the water production pump 19 through the pipeline pressure and the water production flow, and by setting the water production and backwashing cycle, the water production efficiency can be improved and the service life of the flat nano-ceramic membrane reactor 22 can be extended. The system automation of the utility model is high, which is convenient for precise control of the parameters in the sewage treatment process, improves the automation of the sewage treatment process, and improves the efficiency of sewage purification.

[0023] In this embodiment, the PLC controller 2 is a Siemens S7-1200 series PLC as the host of the control system, the EP200SP distributed IO module is the substation of the control system, the touch screen is set on the PLC control cabinet panel, the computer human-machine configuration software operation interface is set in the intelligent control center, the PLC master station expands the 485 communication module, the PLC master station is connected to the EP200SP interface through a network cable, and the digital input, digital output, analog input and analog output modules are expanded behind the EP200SP interface; the DI output module is used to detect the flow pusher, water pump operation, fault, automatic signal, valve switch in place signal, the DO module is used to control the start and stop of each device, the valve switch, the AI ​​module is used to detect the instrument transmission signal, the AO module is used to adjust the frequency signal of the inverter, etc. The master station is connected to the slave station, the master station is connected to the touch screen through Ethernet, the master station is connected to the computer human monitoring software through optical fiber, and the master station is connected to the fan, the smart electric energy meter, etc. through the RS485 bus. The above configuration can meet the control system requirements.

[0024] In this embodiment, the redox potential meter 3, the dissolved oxygen detector 4 and the sludge concentration meter 5 use Hach model SC-200 transmitters.

[0025] In this embodiment, in the utility model, the main PLC controller 2 is a Siemens S7-1200 series PLC, the distributed PLC controller is a Siemens distributed controller 18 is an EP200 series, the touch screen operation panel 9 is a Weiluntong MT8102IE series touch screen, and the computer host operation station 1 is a Siemens WINCC configuration software series.

[0026] In this embodiment, the frequency converter of the water production pump 19 is ABB series model ACS510-01-031A-4, the frequency converter of the backwash pump 20 is ACS510-01-088A-4, and the frequency converter of the sludge return pump is ACS510-01-017A-4.

[0027] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A PLC control system for sewage treatment based on a flat ceramic membrane circular device, characterized in that: The invention comprises an oxidation ditch reaction pool (21), a main PLC controller (2), a sensor and a pump group. The oxidation ditch reaction pool (21) is circular, and is provided with four ceramic membrane pools (21-1), a sludge return zone (21-4) and a water distribution zone (21-5) in the middle. The four ceramic membrane pools (21-1) are all equipped with a flat nano ceramic membrane reactor (22), an aeration device (25) and a membrane pool liquid level meter (6). A circular oxidation ditch is provided around the oxidation ditch, and an oxidation reduction potential meter (3) and a dissolved oxygen meter are provided in the oxidation ditch. The oxidation ditch is provided with an oxidation ditch water inlet (21-2) and an oxidation ditch water outlet (21-3). The oxidation ditch reaction tank (21) is divided into an anaerobic zone, an anoxic zone and an aerobic zone. The anaerobic zone, the anoxic zone and the aerobic zone are all provided with flow pushers (15). The oxidation ditch water outlet (21-3) is connected to a sludge return zone (21-4). The sludge return zone (21-4) is provided with a sludge return pump (16) and a sludge discharge pump (13). The sludge discharge pump (13) connected to the sludge disposal equipment; the four ceramic membrane pools (21-1) are respectively provided with an inlet / outlet gate (12); the sludge return area (21-4) is connected to the water inlet of the four ceramic membrane pools (21-1); the flat nano ceramic membrane reactor (22) in the ceramic membrane pool (21-1) is connected to the main pipe (24) through a branch pipe (23); the main pipe (24) is connected to the water production pump (19) and the backwash pump (20); the water outlet pipes of the water production pump (19) and the backwash pump (20) are further connected to the purple The external light disinfection equipment (26) is provided with a water production pressure gauge (7) on the pipeline between the water production pump (19) and the flat nano-ceramic membrane reactor (22), and a water production flow meter (8) and a gas / electric valve (11) are provided on the pipeline between the water production pump (19) and the ultraviolet light disinfection equipment (26). The aeration device (25) is connected to the fan (17) in the equipment room through a pipeline; the backwash pump (20) is connected to a drug washing pump (14) on the pipeline, and the drug washing pump (14) is connected to the drug washing system.

2. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: The main PLC controller (2) is respectively connected to the distributed PLC controller (18), the touch screen operation panel (9), and the computer host operation station (1); the distributed PLC controller (18) is connected to the redox potential meter (3), the dissolved oxygen detector (4), the sludge concentration meter (5), the membrane pool level meter (6), the produced water pressure meter (7), the produced water flow meter (8), the frequency converter (10), the gas / electric valve (11), the inlet / outlet gate (12), the sludge pump (13), the chemical washing pump (14), and the flow pusher (15); the frequency converter (10) is connected to the produced water pump (19), the backwash pump (20), and the sludge return pump (16), and is used for automatically adjusting the water flow of the produced water pump (19), the backwash pump (20), and the sludge return pump (16); the frequency converter (10) is an ACS510 series frequency converter of ABB.

3. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: The main PLC controller (2) is a Siemens S7-1200 series PLC, the distributed PLC controller is a Siemens distributed controller (18) of the EP200 series, the touch screen operation panel (9) is the Weiluntong MT8102 series, and the computer host operation station (1) is a Siemens WINCC configuration software series.

4. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: The oxidation-reduction potential meter (3), the dissolved oxygen detector (4) and the sludge concentration meter (5) are respectively arranged on both sides of the anoxic zone, the facultative anoxic zone and the aerobic zone of the oxidation ditch.

5. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: The four ceramic membrane pools (21-1) are integrated nano-ceramic membrane device pools.

6. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: The water production pump (19), backwash pump (20), chemical wash pump (14), and fan (17) are all distributed in the equipment room.

7. A sewage treatment PLC control system based on a flat ceramic membrane circular equipment according to claim 1, characterized in that: An electric opening regulating valve (27) and an air volume flow meter (28) are provided on the connecting pipeline between the aeration device (25) and the fan (17).

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