A sewage treatment operation control system

Abstract

The present invention discloses a sewage treatment operation control system, including: a nitrification reaction control module for controlling the ammonia nitrogen index at the outlet of the aeration tank; an internal reflux control module for controlling the internal reflux flow; an external reflux control module for controlling the external reflux flow; an intelligent dosing control module for controlling the total phosphorus index of the secondary sedimentation tank outlet; a COD control module for controlling the COD index at the outlet of the aeration tank; a precise aeration control module for controlling the dissolved oxygen index of the gallery; and an external carbon source control module for realizing automatic addition of an external carbon source. The present invention can realize the full automatic operation of the sewage treatment plant by designing the nitrification reaction control module, the internal reflux control module, the external reflux control module, the intelligent dosing control module, the COD control module, the precise aeration control module and the external carbon source control module, and the blower unit is controlled by the PLC control module to coordinate with the gallery valve to adjust the aeration volume to reach the required set value, and the intelligent level is high.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment operation control system. Background Art

[0002] In recent years, as the discharge standards of sewage treatment plants have become increasingly stringent, the shift from extensive management to intelligent control management has become the current development trend. However, the current level of intelligent control is still in its infancy, limited to unilateral intelligent control of carbon source addition, and cannot yet achieve fully automatic operation of sewage treatment plants. Summary of the invention

[0003] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a sewage treatment operation control system.

[0004] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0005] A sewage treatment operation control system, comprising:

[0006] Nitrification reaction control module, used to control the ammonia nitrogen index at the outlet of the aeration tank;

[0007] An internal reflow control module is used to control the internal reflow flow rate to meet the needs of the denitrification reaction;

[0008] External reflow control module, used to control the external reflow flow rate to meet the needs of biological phosphorus removal;

[0009] Intelligent dosing control module, used to control the total phosphorus index of the effluent from the secondary sedimentation tank;

[0010] COD control module, used to control the COD index of the aeration tank outlet;

[0011] The precise aeration control module is connected to the nitrification control module and the PLC control module to control the dissolved oxygen index of the corridor;

[0012] The external carbon source control module is used to realize automatic addition of the external carbon source.

[0013] Furthermore, the nitrification reaction control module compares the aeration tank effluent ammonia nitrogen set value SP1 with the actual aeration tank effluent ammonia nitrogen feedback value PV1 to determine whether the dissolved oxygen content in the aeration tank needs to be increased or decreased, and transmits the result to the precise aeration control module in the form of a correction value CV1.

[0014] Furthermore, the internal reflow control module compares the set value SP2 of the total nitrogen in the aeration tank effluent with the actual total nitrogen feedback value PV2 of the aeration tank effluent to determine whether the internal reflow amount in the aeration tank needs to be increased or decreased. The internal reflow control module can achieve five gears:

[0015] 1) Start a reflux pump and set the frequency to 50 Hz;

[0016] 2) Turn on the two reflux pumps and set the frequency to 40 Hz;

[0017] 3) Start two reflux pumps, one with a frequency of 40 Hz and the other with a frequency of 50 Hz;

[0018] 4) Turn on two reflux pumps, and set the frequency to 50 Hz;

[0019] 5) Turn on the three reflux pumps and set the frequency to 50 Hz.

[0020] Furthermore, the external reflow control module compares the set value SP3 of the total phosphorus in the aeration tank effluent with the actual feedback value PV3 of the total phosphorus in the aeration tank effluent to determine whether the external reflow volume in the aeration tank needs to be increased or decreased. The external reflow control module can achieve five gears:

[0021] 1) Turn on two external reflux pumps, and set the frequency to 50 Hz;

[0022] 2) Start three external reflux pumps, and set the frequencies to 50 Hz, 40 Hz, and 40 Hz;

[0023] 3) Start three external reflux pumps, and set the frequencies to 50 Hz, 50 Hz and 40 Hz;

[0024] 4) Turn on three external reflux pumps, and set the frequency to 50 Hz;

[0025] 5) Turn on four external reflux pumps and set the frequency to 50 Hz.

[0026] Furthermore, the intelligent dosing control module compares the total phosphorus set value SP4 of the effluent from the secondary sedimentation tank with the actual total phosphorus feedback value PV4 of the effluent from the secondary sedimentation tank to determine whether it is necessary to start the aluminum sulfate dosing pump for automatic dosing;

[0027] When the total phosphorus at the outlet of the secondary sedimentation tank is lower than the set value SP4, the system will not add chemicals;

[0028] When the total phosphorus at the outlet of the secondary sedimentation tank is slightly higher than the set value SP4, the aluminum sulfate dosing pump is controlled to add aluminum sulfate for 45 minutes every 2 hours. When the total phosphorus at the outlet of the secondary sedimentation tank continues to rise, the aluminum sulfate dosing pump is controlled to increase the dosing step by step from every 2 hours to 2 hours of continuous dosing.

[0029] Furthermore, the COD control module compares the COD set value SP5 of the aeration tank effluent with the actual COD feedback value PV5 of the aeration tank effluent to determine whether the dissolved oxygen content in the last area of ​​the aerobic zone of the aeration tank needs to be increased or decreased, and transmits the result in the form of a correction value CV2 to the precise aeration control module of the last area of ​​the aerobic zone;

[0030] When the nitrification control module and the COD control module work at the same time and their control variables conflict, the precise aeration control module in the last area of ​​the aerobic zone receives correction values ​​from both the nitrification control module and the COD control module at the same time, and adopts the correction command with the larger absolute value of the two to ensure sufficient aeration in the aerobic zone.

[0031] Furthermore, the precise aeration control module receives a reference value set by an operator, and superimposes a correction value in the nitrification control module or the COD control module on the reference value as a final set value;

[0032] The precise aeration control module is connected to the PLC control module. The output value of the precise aeration control module is the aeration volume, which is transmitted to the PLC control module. The PLC control module controls the blower unit and the gallery valve to coordinate and adjust the aeration volume. The actual air volume is made to approach the air volume set value by adjusting the valve opening of the gallery valve.

[0033] The present invention also discloses a sewage treatment operation control device, comprising the sewage treatment operation control system as described above.

[0034] Furthermore, the device also includes a coarse screen, a water inlet pump room, a fine screen, a grit tank, a primary sedimentation tank, an anaerobic zone, an anoxic zone, an aerobic zone, a secondary sedimentation tank, a filter cloth filter, a disinfection contact tank, a return and residual sludge pump room, a sludge concentration tank, a sludge homogenization tank and a sludge dewatering machine room. The coarse screen, the water inlet pump room, the fine screen, the grit tank, the primary sedimentation tank, the anaerobic zone, the anoxic zone, the aerobic zone, the secondary sedimentation tank, the filter cloth filter, and the disinfection contact tank are arranged in sequence along the water inlet direction. The disinfection contact tank is connected to the river. The secondary sedimentation tank is also connected to the return and residual sludge pump room. The residual sludge pump room is connected to the anaerobic zone, the primary sedimentation tank is connected to the sludge thickening tank, the sludge homogenization tank and the sludge dewatering room in sequence, the sludge thickening tank is also connected to the return and residual sludge pump room, the anaerobic zone water inlet is provided with an external carbon source control module and a precise aeration control module, the aerobic zone water outlet is provided with a nitrification reaction control module, an internal reflux control module and a COD control module, the disinfection contact tank is provided with an intelligent dosing control module, and the return and residual sludge pump room outlet is provided with an external reflux control module.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The invention discloses a sewage treatment operation control system, comprising: a nitrification reaction control module, used for controlling the ammonia nitrogen index at the outlet of an aeration tank; an internal reflux control module, used for controlling the internal reflux flow rate to meet the needs of denitrification reaction; an external reflux control module, used for controlling the external reflux flow rate to meet the needs of biological phosphorus removal; an intelligent dosing control module, used for controlling the total phosphorus index of the effluent of a secondary sedimentation tank; a COD control module, used for controlling the COD index at the outlet of an aeration tank; a precise aeration control module, connected with the nitrification reaction control module and the PLC control module, used for controlling the dissolved oxygen index of a gallery; and an external carbon source control module, used for realizing automatic addition of an external carbon source. The sewage treatment operation control system provided by the present invention can realize full-automatic operation of the sewage treatment plant by designing a nitrification reaction control module, an internal reflux control module, an external reflux control module, an intelligent dosing control module, a COD control module, a precise aeration control module and an external carbon source control module. The blower unit is controlled by the PLC control module to coordinate with the gallery valve to adjust the aeration amount, and the valve opening of the gallery valve is adjusted to make the aeration amount reach the required set value. The intelligent level is high and the practical promotion value is greater. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the dosing curve diagram of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0039] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0040] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0041] like Figure 1 As shown, the present invention discloses a sewage treatment operation control system, comprising:

[0042] Nitrification reaction control module, used to control the ammonia nitrogen index at the outlet of the aeration tank;

[0043] An internal reflow control module is used to control the internal reflow flow rate to meet the needs of the denitrification reaction;

[0044] External reflow control module, used to control the external reflow flow rate to meet the needs of biological phosphorus removal;

[0045] Intelligent dosing control module, used to control the total phosphorus index of the effluent from the secondary sedimentation tank;

[0046] COD control module, used to control the COD index of the aeration tank outlet;

[0047] The precise aeration control module is connected to the nitrification control module and the PLC control module to control the dissolved oxygen index of the corridor;

[0048] The external carbon source control module is used to realize automatic addition of the external carbon source.

[0049] The nitrification reaction control module compares the aeration tank effluent ammonia nitrogen set value SP1 with the actual aeration tank effluent ammonia nitrogen feedback value PV1 to determine whether the dissolved oxygen content in the aeration tank needs to be increased or decreased, and transmits the result to the precise aeration control module in the form of a correction value CV1.

[0050] The internal recirculation control module compares the set value SP2 of the total nitrogen in the aeration tank effluent with the actual feedback value PV2 of the total nitrogen in the aeration tank effluent to determine whether the internal recirculation volume in the aeration tank needs to be increased or decreased.

[0051] The internal reflux control module can achieve five gears:

[0052] 1) Start a reflux pump and set the frequency to 50 Hz;

[0053] 2) Turn on the two reflux pumps and set the frequency to 40 Hz;

[0054] 3) Start two reflux pumps, one with a frequency of 40 Hz and the other with a frequency of 50 Hz;

[0055] 4) Turn on two reflux pumps, and set the frequency to 50 Hz;

[0056] 5) Turn on the three reflux pumps and set the frequency to 50 Hz.

[0057] The external reflow control module compares the set value SP3 of the total phosphorus in the aeration tank effluent with the actual feedback value PV3 of the total phosphorus in the aeration tank effluent to determine whether the external reflow volume in the aeration tank needs to be increased or decreased.

[0058] The external reflux control module can achieve five gears:

[0059] 1) Turn on two external reflux pumps, and set the frequency to 50 Hz;

[0060] 2) Start three external reflux pumps, and set the frequencies to 50 Hz, 40 Hz, and 40 Hz;

[0061] 3) Start three external reflux pumps, and set the frequencies to 50 Hz, 50 Hz and 40 Hz;

[0062] 4) Turn on three external reflux pumps, and set the frequency to 50 Hz;

[0063] 5) Turn on four external reflux pumps and set the frequency to 50 Hz.

[0064] The intelligent dosing control module compares the set value SP4 of the total phosphorus in the effluent from the secondary sedimentation tank with the actual feedback value PV4 of the total phosphorus in the effluent from the secondary sedimentation tank to determine whether the aluminum sulfate dosing pump needs to be turned on for automatic dosing;

[0065] When the total phosphorus at the outlet of the secondary sedimentation tank is lower than the set value SP4, the system will not add drugs; when the total phosphorus at the outlet of the secondary sedimentation tank is slightly higher than the set value SP4, the aluminum sulfate dosing pump is controlled to add aluminum sulfate for 45 minutes every 2 hours. When the total phosphorus at the outlet of the secondary sedimentation tank continues to rise, the aluminum sulfate dosing pump is controlled to increase the dosage from every 2 hours to 2 hours of continuous dosing. The dosing curve is as follows Figure 1 As shown, the horizontal axis is the difference TP of the total phosphorus at the outlet of the secondary sedimentation tank exceeding the set value, and the vertical axis is the dosing time.

[0066] The COD control module compares the aeration tank effluent COD set value SP5 with the actual aeration tank effluent COD feedback value PV5 to determine whether the dissolved oxygen content in the last area of ​​the aerobic zone of the aeration tank needs to be increased or decreased, and transmits the result in the form of a correction value CV2 to the precise aeration control module of the last area of ​​the aerobic zone.

[0067] When the nitrification control module and the COD control module work at the same time and their control variables conflict, the precise aeration control module of the last area of ​​the aerobic zone 8 receives correction values ​​from both the nitrification control module and the COD control module at the same time, and adopts the correction command with the larger absolute value of the two to ensure sufficient aeration in the aerobic zone.

[0068] The precise aeration control modules of each partition are connected to the nitrification reaction control module and the PLC control module to control the dissolved oxygen index of the corridor corresponding to each partition.

[0069] The precise aeration control module receives the reference value set by the operator, and on this basis, superimposes the correction value in the nitrification control module or the COD control module as the final set value.

[0070] The output value of the precise aeration control module is the aeration volume, which is transmitted to the PLC control module. The PLC control module controls the blower unit and the gallery valve to coordinate and adjust the aeration volume, and adjusts the valve opening of the gallery valve to make the aeration volume reach the required set value.

[0071] To ensure that the blower can provide sufficient and stable air volume, a blower total air volume PID control module needs to be set up, and the control target is to meet the sum of the air volume required by the precise aeration control module in each zone. The PLC control module calculates the air volume required by the precise aeration control module in each zone and then adds it up to get the total set air volume value, which is sent to the blower total air volume PID control module.

[0072] The output signal of the blower total air volume PID control module is the common speed command for each blower. The air flow entering each zone of the aeration tank (anaerobic zone 6, anoxic zone 7, aerobic zone 8) is actually controlled by the blower total air volume PID control module and the precise aeration control module of each zone.

[0073] like Figure 2 As shown, the present invention also discloses a sewage treatment operation control device, including the sewage treatment operation control system as described above and a coarse screen 1, a water inlet pump room 2, a fine screen 3, a grit tank 4, a primary sedimentation tank 5, an anaerobic zone 6, an anoxic zone 7, an aerobic zone 8, a secondary sedimentation tank 9, a filter cloth filter 10, a disinfection contact tank 11, a return and residual sludge pump room 12, a sludge concentration tank 13, a sludge homogenization tank 14 and a sludge dewatering machine room 15, wherein the coarse screen 1, the water inlet pump room 2, the fine screen 3, the grit tank 4, the primary sedimentation tank 5, the anaerobic zone 6, the anoxic zone 7, the aerobic zone 8, the secondary sedimentation tank 9, the filter cloth filter 10, the disinfection contact tank 11, the return and residual sludge pump room 12, the sludge concentration tank 13, the sludge homogenization tank 14 and the sludge dewatering machine room 15, wherein the coarse screen 1, the water inlet pump room 2, the fine screen 3, the grit tank 4 , primary sedimentation tank 5, anaerobic zone 6, anoxic zone 7, aerobic zone 8, secondary sedimentation tank 9, filter cloth filter 10, disinfection contact tank 11 are arranged in sequence along the water inlet direction, carbon source is supplemented in anaerobic zone 6, air is introduced into aerobic zone 8, disinfection contact tank 11 is connected to the river, and an intelligent dosing control module is arranged at disinfection contact tank 11. Secondary sedimentation tank 9 is also connected to return and excess sludge pump room 12. The sludge in secondary sedimentation tank 9 is transported to return and excess sludge pump room 12 for treatment to obtain return sludge, which is then transported to anaerobic zone 6. This loop controls the external reflow flow rate through the external reflow control module to meet the needs of biological phosphorus removal. The water discharged from the outlet of the aerobic zone 8 flows back to the anoxic zone 7 in the form of internal reflow. This loop controls the internal reflow flow rate through the internal reflow control module to meet the needs of denitrification. The anaerobic zone 6, the anoxic zone 7, and the aerobic zone 8 are three zones of the aeration tank. The nitrification reaction control module and the COD control module are respectively set at the outlet of the aeration tank (i.e., the outlet of the aerobic zone 8). The aeration tank inlet is provided with an external carbon Source control module and precise aeration control module, the residual sludge from the return and residual sludge pump room 12 is transported to the sludge thickening tank 13 for thickening treatment, the primary sludge from the primary sedimentation tank 5 is transported to the sludge thickening tank 13, the sludge homogenization tank 14 and the sludge dewatering room 15 for treatment in turn, the sewage discharged from the sludge thickening tank 13, the supernatant discharged from the sludge homogenization tank 14 and the filtrate discharged from the sludge dewatering room 15 are connected to the water inlet pump room 2, and the sludge discharged from the sludge dewatering room 15 is transported to the sludge treatment plant for treatment.

[0074] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0075] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, 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 sewage treatment operation control system, characterized in that: include: Nitrification reaction control module, used to control the ammonia nitrogen index at the outlet of the aeration tank; An internal reflow control module is used to control the internal reflow flow rate to meet the needs of the denitrification reaction; External reflow control module, used to control the external reflow flow rate to meet the needs of biological phosphorus removal; Intelligent dosing control module, used to control the total phosphorus index of the effluent from the secondary sedimentation tank; COD control module, used to control the COD index of the aeration tank outlet; The precise aeration control module is connected to the nitrification control module and the PLC control module to control the dissolved oxygen index of the corridor; An external carbon source control module is used to realize automatic addition of an external carbon source; The nitrification reaction control module compares the set value SP1 of ammonia nitrogen in the aeration tank effluent with the actual ammonia nitrogen feedback value PV1 of the aeration tank effluent to determine whether the dissolved oxygen in the aeration tank needs to be increased or decreased, and transmits the result to the precise aeration control module in the form of a correction value CV1; The internal reflow control module compares the set value SP2 of the total nitrogen in the aeration tank effluent with the actual total nitrogen feedback value PV2 of the aeration tank effluent to determine whether the internal reflow in the aeration tank needs to be increased or decreased. The internal reflow control module can achieve five gears: 1) Start a reflux pump and set the frequency to 50 Hz; 2) Turn on the two reflux pumps and set the frequency to 40 Hz; 3) Start two reflux pumps, one with a frequency of 40 Hz and the other with a frequency of 50 Hz; 4) Turn on two reflux pumps, and set the frequency to 50 Hz; 5) Start three reflux pumps, and set the frequency to 50 Hz; The external reflow control module compares the set value SP3 of the total phosphorus in the aeration tank effluent with the actual feedback value PV3 of the total phosphorus in the aeration tank effluent to determine whether the external reflow volume in the aeration tank needs to be increased or decreased. The external reflow control module can achieve five gears: 1) Turn on two external reflux pumps, and set the frequency to 50 Hz; 2) Start three external reflux pumps, and set the frequencies to 50 Hz, 40 Hz, and 40 Hz; 3) Start three external reflux pumps, and set the frequencies to 50 Hz, 50 Hz and 40 Hz; 4) Turn on three external reflux pumps, and set the frequency to 50 Hz; 5) Turn on four external reflux pumps, and set the frequency to 50 Hz; The COD control module compares the COD set value SP5 of the aeration tank effluent with the actual COD feedback value PV5 of the aeration tank effluent to determine whether the dissolved oxygen content in the last area of ​​the aerobic zone of the aeration tank needs to be increased or decreased, and transmits the result in the form of a correction value CV2 to the precise aeration control module of the last area of ​​the aerobic zone; When the nitrification control module and the COD control module work at the same time and their control variables conflict, the precise aeration control module in the last area of ​​the aerobic zone receives correction values ​​from both the nitrification control module and the COD control module at the same time, and adopts the correction command with the larger absolute value of the two to ensure sufficient aeration in the aerobic zone.

2. A sewage treatment operation control system according to claim 1, characterized in that: The intelligent dosing control module compares the total phosphorus set value SP4 of the secondary sedimentation tank effluent with the actual total phosphorus feedback value PV4 of the secondary sedimentation tank effluent to determine whether it is necessary to turn on the aluminum sulfate dosing pump for automatic dosing; When the total phosphorus at the outlet of the secondary sedimentation tank is lower than the set value SP4, the system will not add chemicals; When the total phosphorus at the outlet of the secondary sedimentation tank is slightly higher than the set value SP4, the aluminum sulfate dosing pump is controlled to add aluminum sulfate for 45 minutes every 2 hours. When the total phosphorus at the outlet of the secondary sedimentation tank continues to rise, the aluminum sulfate dosing pump is controlled to increase the dosing step by step from every 2 hours to 2 hours of continuous dosing.

3. A sewage treatment operation control system according to claim 1, characterized in that: The precise aeration control module receives the reference value set by the operator, and superimposes the correction value in the nitrification control module or the COD control module on the reference value as the final set value; The precise aeration control module is connected to the PLC control module. The output value of the precise aeration control module is the aeration volume, which is transmitted to the PLC control module. The PLC control module controls the blower unit and the gallery valve to coordinate and adjust the aeration volume. The actual air volume is made to approach the air volume set value by adjusting the valve opening of the gallery valve.

4. A sewage treatment operation control device, characterized in that: A sewage treatment operation control system comprising any one of claims 1-3.

5. A sewage treatment operation control device according to claim 4, characterized in that: It also includes a coarse screen, an inlet pump room, a fine screen, a grit tank, a primary sedimentation tank, an anaerobic zone, an anoxic zone, an aerobic zone, a secondary sedimentation tank, a filter cloth filter, a disinfection contact tank, a return and excess sludge pump room, a sludge concentration tank, a sludge homogenization tank and a sludge dewatering machine room. The coarse screen, the inlet pump room, the fine screen, the grit tank, the primary sedimentation tank, the anaerobic zone, the anoxic zone, the aerobic zone, the secondary sedimentation tank, the filter cloth filter, and the disinfection contact tank are arranged in sequence along the water inlet direction. The disinfection contact tank is connected to the river. The secondary sedimentation tank is also connected to the return and excess sludge pump room. The room is connected to the anaerobic zone, the primary sedimentation tank is connected to the sludge thickening tank, the sludge homogenization tank and the sludge dewatering room in sequence, the sludge thickening tank is also connected to the return and residual sludge pump room, the anaerobic zone water inlet is provided with an external carbon source control module and a precise aeration control module, the aerobic zone water outlet is provided with a nitrification reaction control module, an internal reflux control module and a COD control module, the disinfection contact tank is provided with an intelligent dosing control module, and the return and residual sludge pump room outlet is provided with an external reflux control module.

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