CN109368921B - Green ecological sewage treatment control system - Google Patents

Green ecological sewage treatment control system Download PDF

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Publication number
CN109368921B
CN109368921B CN201811338596.0A CN201811338596A CN109368921B CN 109368921 B CN109368921 B CN 109368921B CN 201811338596 A CN201811338596 A CN 201811338596A CN 109368921 B CN109368921 B CN 109368921B
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control center
pump
plc control
sewage
tank
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CN109368921A (en
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王秀礼
邱伟峰
朱荣生
付强
赵媛媛
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Jiangsu University
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Jiangsu University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
    • C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/005—Processes using a programmable logic controller [PLC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/11—Turbidity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/06—Pressure conditions
    • C02F2301/066—Overpressure, high pressure
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Activated Sludge Processes (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention provides a green ecological sewage treatment control system, which comprises a PLC control center, an upper computer, a power system, a collection system, a treatment system and a recycling system; the PLC control center is electrically connected with the upper computer, the power system, the collecting system, the processing system and the recycling system, and is used for controlling the collecting system, the processing system and the recycling system to work; the upper computer is connected with the PLC control center through an Ethernet cable; the power system provides electric energy for the whole green ecological sewage treatment control system. According to the design method of the green ecological sewage treatment control system, the wind driven generator and the solar cell panel are arranged to form a dual-power supply mode together with the motor power supply, and the system can work independently to supply power to the system, so that all resources are effectively utilized, and the purpose of energy conservation can be achieved.

Description

Green ecological sewage treatment control system
Technical Field
The invention relates to the field of sewage treatment, in particular to a green ecological sewage treatment control system.
Background
The sewage treatment project is always the most important in the construction of urban infrastructure, the past sewage treatment projects are usually mostly built on the ground, and the noise and the waste gas generated by the long-term operation of the sewage treatment equipment also have negative influence on the lives of nearby residents. Aiming at the damage of ground sewage treatment equipment to the surrounding environment of a city, a green ecological sewage treatment system with most of mechanical equipment arranged in an underground place becomes an important ring in the sewage treatment engineering. The green ecological sewage treatment system not only can greatly reduce the influence on the surrounding environment, but also can break through the traditional overground construction mode, and greatly saves land resources.
The current patents related to the direction of the green ecological sewage treatment control system mainly include: a system for treating underground sewage (publication No. CN205821110U) is composed of water storage well, neutralizing tank, breaking-up settling pool, filter grid, aerating pool, distributing pool and irrigation unit, and features that the whole sewage treating system is underground and can meet the standard of irrigation water for greening; a system for treating underground sewage (CN 108191171A) is composed of water purifying and filtering system, multi-stage sewage treating system, floating island biologic treating system, static test pool and standard discharge system, and features that the sewage is treated to form a closed circulation system, so improving water quality and cyclic utilization of underground sewage.
The existing sewage treatment system is not sufficient to recognize the complexity of sewage treatment, usually only pays attention to certain elements, does not pay attention to the integrity of the sewage treatment system, and is easy to cause resource waste.
Disclosure of Invention
In order to further optimize the integrity of the green ecological sewage treatment system, the invention provides a design method of a green ecological sewage treatment control system.
The purpose of the invention is realized by the following technical scheme:
a green ecological sewage treatment control system comprises a PLC control center, an upper computer, a power system, a collection system, a treatment system and a recycling system; the PLC control center is electrically connected with the upper computer, the power system, the collecting system, the processing system and the recycling system, and is used for controlling the collecting system, the processing system and the recycling system to work; the upper computer is connected with the PLC control center through an Ethernet cable; the power system provides electric energy for the whole green ecological sewage treatment control system;
the power system comprises a wind driven generator, a solar panel, a wind-solar complementary controller, a storage battery pack, a motor power supply and an inverter, wherein the wind driven generator and the solar panel are electrically connected with the input end of the wind-solar complementary controller;
the collecting system comprises a domestic sewage collecting device, a rainwater collecting device, an inlet valve, a pretreatment tank, a grating machine, a first liquid level meter and a first turbidity meter, wherein the domestic sewage collecting device and the rainwater collecting device are both connected with the inlet valve through pipelines, the inlet valve is connected with the grating machine through a pipeline, the inlet valve is in communication connection with the PLC control center, and the grating machine is arranged at an inlet of the pretreatment tank; the first liquid level meter and the first turbidity meter are both arranged on the pretreatment tank and are in communication connection with the PLC control center;
the treatment system comprises a submersible sewage pump, a sedimentation tank, a flocculation stirrer, a mixing stirrer, a dosing tank, a first flow meter, a dosing pump, a second turbidity meter, an air blower, an aeration filter, a sludge pump, a sludge tank, an oxygen dissolution instrument, a waste gas concentration sensing instrument, a ventilator, a second flow meter and a second level meter, wherein the submersible sewage pump and the flocculation stirrer are both arranged in the sedimentation tank, the submersible sewage pump is provided with the first flow meter, the first flow meter is in communication connection with the PLC control center, and the submersible sewage pump and the flocculation stirrer are both connected with the PLC control center through a frequency converter; the chemical feeding tank is connected with the sedimentation tank through a pipeline, the mixing stirrer is arranged in the chemical feeding tank, and the mixing stirrer is connected with the PLC control center through a frequency converter; the dosing pump is arranged on a pipeline between the dosing tank and the sedimentation tank, the second flow meter is arranged on the dosing pump, the dosing pump is connected with the PLC control center through a frequency converter, and the second flow meter is in communication connection with the PLC control center; the aeration filter tank is connected with the sedimentation tank, the blower and the sludge tank through pipelines, and the blower is connected with the PLC control center through a frequency converter; the second turbidity meter and the oxygen dissolution instrument are arranged on the aeration filter tank and are in communication connection with the PLC control center; the sludge pump is arranged on a pipeline between the aeration filter tank and the sludge tank, and the sludge pump and the ventilator are connected with the PLC control center through a frequency converter; the waste gas concentration sensor is in communication connection with the PLC control center; the second liquid level meter is arranged on the sedimentation tank and is in communication connection with the PLC control center;
the recycling system comprises a self-sucking pump, an artificial lake, a pressurizing pump and an irrigation valve, and the self-sucking pump is connected with the artificial lake through a pipeline; the booster pump with artifical lake passes through the pipe connection, the booster pump export is equipped with the irrigation valve, self priming pump, booster pump all with PLC control center passes through the converter and connects, the irrigation valve with PLC control center communication is connected.
Further, the working method of the green ecological sewage treatment control system comprises the following steps:
step 1, collecting by a domestic sewage collecting device and a rainwater collecting device, enabling sewage to flow into a pretreatment tank through an inlet valve, removing solid impurities with large volume in the sewage by a grating machine at the inlet of the pretreatment tank, and feeding back a liquid level L of the pretreatment tank according to a first liquid level meter1The opening degree of the inlet valve is controlled by the PLC control center;
step 2, enabling the sewage to flow into a sedimentation tank, and feeding back the liquid level L of the sedimentation tank according to a second liquid level meter2The PLC control center controls the start and stop of the submersible sewage pump; when L is2When the height of the submersible sewage pump reaches 2/3, the PLC control center starts the submersible sewage pump; when L is2The height of the submersible sewage pump is less than 2/3, and the PLC control center closes the submersible sewage pump; sewage flow rate fed back by first flowmeter Q1The PLC control center controls the rotation speed of the submersible sewage pump to adjust the sewage flow Q1(ii) a The waste gas concentration sensor feeds back the waste gas concentration in the system to the PLC control center, and the PLC control center controls the rotating speed of the ventilator to adjust the flow rate of the waste gas;
step 3, measuring the turbidity of the sewage at the inlet of the pretreatment tank according to a first turbidity meter, and adding the chemicals into the sedimentation tank through a chemical adding pump by a chemical adding tank after calculation; feeding back the flow of the dosing pump to a PLC (programmable logic controller) control center by a second flow meter according to the turbidity of the aerated filter tank fed back by the second turbidity meter, controlling the start and stop of the mixing stirrer, the start and stop of the flocculation stirrer and the rotating speed of a motor of the dosing pump by the PLC control center, and continuously adjusting the rotating speed of the dosing pump until the turbidity in the aerated filter tank reaches the discharge standard that suspended matters (ss) are less than or equal to 10 mg/L;
step 4, enabling sewage to enter the aeration filter tank from the sedimentation tank, controlling the start and stop of the air blower by the PLC control center, feeding back the oxygen content in the aeration filter tank to the PLC control center by the oxygen dissolving instrument, controlling the rotating speed of the air blower to increase by the PLC control center when the dissolved oxygen concentration is lower than 4mg/L, and enabling the dissolved oxygen concentration to reach the requirement of 9mg/L until the sewage flows out through membrane filtration in the aeration filter tank; the PLC control center starts a sludge pump to discharge sludge from the aeration filter tank into a sludge tank;
and step 5, the PLC control center controls the start and stop of a self-sucking pump, the self-sucking pump sucks water in the aeration filter tank into the artificial lake, and the PLC control center controls the start and stop of a pressurizing pump in the irrigation system and the opening of an irrigation valve to irrigate the outside.
Further, in step 1, the inlet valve opening degree function under normal conditions is as follows:
Figure BDA0001861887220000031
in the formula:
u1-inlet valve opening;
Q1-inlet sewage flow rate, unit: cubic meters per second;
f, a relation function of the opening of the inlet valve with respect to the flow;
L1pretreatment tank level, unit: rice;
H1-pretreatment tank height, unit: rice;
adopting integral separation type PID control, setting a threshold value epsilon to be 0.05, and the opening function of an inlet valve under the condition that the submersible sewage pump suddenly stops running is as follows:
Figure BDA0001861887220000032
in the formula: t-inlet valve control sampling period, unit: second;
kp-inlet valve control proportional gain coefficient;
TI-inlet valve control integration time;
TD-inlet valve control differential time;
e1(k) kth sample timeInput of deviation value of opening of inlet valve e1(k)＝f(Q1)；
u1(k) -valve opening output value of the inlet valve at the kth sampling moment.
Further, in step 3, the PLC control center adopts integral separation type PID to control the rotating speed of the dosing pump motor, and the specific method is as follows:
when the turbidity of the sewage in the aeration filter tank is not different from the discharge standard, the rotating speed of the dosing pump is kept unchanged; when the turbidity of the aeration filter is greater than the discharge standard, the dosing pump is accelerated to operate; when the turbidity of the aeration filter is smaller than the discharge standard, the dosing pump is decelerated.
Further, the control function of the rotation speed of the dosing pump motor is as follows:
Figure BDA0001861887220000041
Figure BDA0001861887220000042
in the formula:
T2-dosing pump motor control sampling period, unit: second;
Kp2-dosing pump motor control proportional gain factor;
TI2-dosing pump motor control integration time;
TD2-dosing pump motor control differential time;
Qat present-current actual flow rate of dosing pump, in units: cubic meters per second;
Qdosing-dosing pump rated flow, unit: cubic meters per second;
ndosing-dosing pump rated speed, unit: rotating per minute;
e2(k) the deviation value of the rotational speed of the motor of the dosing pump input at the kth sampling moment;
Δu2(k) adjusting the rotation speed and the opening degree of a motor of the dosing pump at the kth sampling momentAnd (6) outputting the value.
In the invention, the upper computer realizes data exchange with the PLC control center through the Ethernet cable, can modify the program of the PLC control center in time in the upper computer, can monitor the running state of the sewage treatment system in real time through configuration software in the upper computer, and can realize effective integration of information resources of different sewage treatment systems by using the data management system.
Has the advantages that:
1. according to the design method of the green ecological sewage treatment control system, the wind driven generator and the solar cell panel are arranged to form a dual-power supply mode together with the motor power supply, and the system can work independently to supply power to the system, so that all resources are effectively utilized, and the purpose of energy conservation can be achieved.
2. According to the design method of the green ecological sewage treatment control system, the arranged PLC control center can monitor the sewage turbidity, the waste gas concentration, the rotating speed of the pump motor, the opening degree of the valve, the sewage liquid level and the like in the sewage treatment system in real time, and the integrated control can ensure that the system always runs safely and efficiently.
Drawings
FIG. 1 is a schematic view of a power system of a green ecological sewage treatment control system.
FIG. 2 is a schematic view of a green ecological sewage treatment control system.
In the figure, 1-wind power generator; 2-a solar panel; 3-wind-solar complementary controller; 4-a battery pack; 5-motor power supply; 6-an inverter; 7-a PLC control center; 8-a domestic sewage collecting device; 9-a rainwater collection device; 10-inlet valve; 11-a pretreatment pool; 12-a grating machine; 13-submersible sewage pump; 14-a sedimentation tank; 15-a flocculating agitator; 16-a mixing agitator; 17-a medicine adding tank; 18-a first flow meter; 19-a dosing pump; 20-a first level gauge; 21-a first turbidimeter; 22-a second turbidimeter; 23-a blower; 24-an aeration filter tank; 25-a sludge pump; 26-a sludge tank; 27-oxygen dissolver; 28-exhaust gas concentration sensor; 29-a ventilator; 30-a self-priming pump; 31-artificial lake; 32-a pressure pump; 33-irrigation valves; 34-a second flow meter; 35-a second level gauge; 36-an upper computer.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
as shown in fig. 1 and 2, a green ecological sewage treatment control system comprises a PLC control center 7, an upper computer 36, a power system, a collection system, a treatment system and a recycling system; the PLC control center 7 is electrically connected with the upper computer 36, the power system, the collecting system, the processing system and the recycling system, and the PLC control center 7 is used for controlling the collecting system, the processing system and the recycling system to work; the upper computer 36 is connected with the PLC control center 7 through an Ethernet cable; the power system provides electric energy for the whole green ecological sewage treatment control system;
the power system comprises a wind driven generator 1, a solar panel 2, a wind-solar complementary controller 3, a storage battery pack 4, a motor power supply 5 and an inverter 6, wherein the wind driven generator 1 and the solar panel 2 are both electrically connected with the input end of the wind-solar complementary controller 3, the storage battery pack 4 is respectively electrically connected with the output end of the wind-solar complementary controller 3 and the inverter 6, and the motor power supply 5 and the inverter 6 are both electrically connected with the PLC control center 7;
the collecting system comprises a domestic sewage collecting device 8, a rainwater collecting device 9, an inlet valve 10, a pretreatment tank 11, a grating machine 12, a first liquid level meter 20 and a first turbidity meter 21, wherein the domestic sewage collecting device 8 and the rainwater collecting device 9 are both connected with the inlet valve 10 through pipelines, the inlet valve 10 is connected with the grating machine 12 through a pipeline, the inlet valve 10 is in communication connection with the PLC control center 7, and the grating machine 12 is arranged at an inlet of the pretreatment tank 11; the first liquid level meter 20 and the first turbidity meter 21 are both arranged on the pretreatment tank 11, and the first liquid level meter 20 and the first turbidity meter 21 are both in communication connection with the PLC control center 7;
the treatment system comprises a submersible sewage pump 13, a sedimentation tank 14, a flocculation stirrer 15, a mixing stirrer 16, a dosing tank 17, a first flow meter 18, a dosing pump 19, a second turbidity meter 22, an air blower 23, an aeration filter 24, a sludge pump 25, a sludge tank 26, an oxygen dissolving meter 27, an exhaust gas concentration sensor 28, a ventilator 29, a second flow meter 34 and a second liquid level meter 35, wherein the submersible sewage pump 13 and the flocculation stirrer 15 are both arranged in the sedimentation tank 14, the submersible sewage pump 13 is provided with the first flow meter 18, the first flow meter 18 is in communication connection with the PLC control center 7, and the submersible sewage pump 13 and the flocculation stirrer 15 are both connected with the PLC control center 7 through frequency converters; the dosing tank 17 is connected with the sedimentation tank 14 through a pipeline, the mixing stirrer 16 is arranged in the dosing tank 17, and the mixing stirrer 16 is connected with the PLC control center 7 through a frequency converter; the dosing pump 19 is arranged on a pipeline between the dosing tank 17 and the sedimentation tank 14, the second flow meter 34 is arranged on the dosing pump 19, the dosing pump 19 is connected with the PLC control center 7 through a frequency converter, and the second flow meter 34 is in communication connection with the PLC control center 7; the aeration filter pool 24 is connected with the sedimentation tank 14, the blower 23 and the sludge pool 26 through pipelines, and the blower 23 is connected with the PLC control center 7 through a frequency converter; the second turbidimeter 22 and the oxygen dissolving instrument 27 are both arranged on the aeration filter 24, and the second turbidimeter 22 and the oxygen dissolving instrument 27 are both in communication connection with the PLC control center 7; the sludge pump 25 is arranged on a pipeline between the aeration filter chamber 24 and the sludge tank 26, and the sludge pump 25-left-falling ventilating fan 29 is connected with the PLC control center 7 through a frequency converter; the waste gas concentration sensor 28 is in communication connection with the PLC control center 7; the second liquid level meter 35 is arranged on the sedimentation tank 14, and the second liquid level meter 35 is in communication connection with the PLC control center 7;
the recycling system comprises a self-sucking pump 30, an artificial lake 31, a pressurizing pump 32 and an irrigation valve 33, wherein the self-sucking pump 30 is connected with the artificial lake 31 through a pipeline; the booster pump 32 with artifical lake 31 passes through the pipe connection, the booster pump 32 export is equipped with irrigation valve 33, self priming pump 30, booster pump 32 all with PLC control center 7 passes through the converter and connects, irrigation valve 33 with PLC control center 7 communication connection.
A working method of a green ecological sewage treatment control system comprises the following steps:
step 1, collecting by a domestic sewage collecting device 8 and a rainwater collecting device 9, enabling sewage to flow into a pretreatment tank 11 through an inlet valve 10, removing solid impurities with large volume in the sewage by a grating machine 12 positioned at an inlet of the pretreatment tank 11, and feeding back the liquid level L of the pretreatment tank 11 according to a first liquid level meter 201The opening degree of the inlet valve 10 is controlled by the PLC control center 7;
step 2, the sewage flows into the sedimentation tank 14, and the liquid level L of the sedimentation tank 14 is fed back according to the second liquid level meter 352The PLC control center 7 controls the start and stop of the submersible sewage pump 13; when L is2When the height of the 2/3 submersible sewage pump 13 is reached, the PLC control center 7 starts the submersible sewage pump 13; when L is2The height of the submersible sewage pump 13 is less than 2/3, and the PLC control center closes the submersible sewage pump 13; the first flowmeter 18 feeds back the sewage flow Q1The PLC control center 7 controls the rotation speed of the submersible sewage pump 13 to adjust the sewage flow Q1(ii) a The waste gas concentration sensor 28 feeds back the waste gas concentration in the system to the PLC control center 7, and the PLC control center 7 controls the rotating speed of the ventilator 29 to adjust the flow rate of the waste gas;
step 3, measuring the turbidity of the sewage at the inlet of the pretreatment tank 11 according to a first turbidity meter 21, and adding chemicals into the sedimentation tank 14 through a chemical adding pump 19 by a chemical adding tank 17 after calculation; feeding back the turbidity of the aeration filter 24 by the second turbidity meter 22, feeding back the flow of the dosing pump 19 by the second flow meter 34 to the PLC control center 7, and controlling the start and stop of the mixing stirrer 16, the start and stop of the flocculation stirrer 15 and the motor rotating speed of the dosing pump 19 by the PLC control center 7 until the turbidity in the aeration filter 24 reaches the discharge standard that suspended matters (ss) are less than or equal to 10 mg/L;
step 4, sewage enters the aeration filter 24 from the sedimentation tank 14, the PLC control center 7 controls the start and stop of the air blower 23, the oxygen content in the aeration filter 24 is fed back to the PLC control center 7 by the oxygen dissolving instrument 27, when the dissolved oxygen concentration is lower than 4mg/L, the PLC control center 7 controls the rotating speed of the air blower 23 to increase, so that the dissolved oxygen concentration reaches the requirement of 9mg/L, and the sewage flows out through the membrane filtration in the aeration filter 24; the PLC control center 7 starts a sludge pump 25 to discharge sludge from the aeration filter 24 to a sludge tank 26;
and step 5, the PLC control center 7 controls the starting and stopping of a self-sucking pump 30, the self-sucking pump 30 sucks water in the aeration filter pool 24 into an artificial lake 31, and the PLC control center 7 controls the starting and stopping of a pressurizing pump 32 in an irrigation system and the opening degree of an irrigation valve 33 to irrigate the outside.
The upper computer realizes data exchange with the PLC control center through an Ethernet cable, can modify the program of the PLC control center in time in the upper computer, can monitor the running state of the sewage treatment system in real time through configuration software in the upper computer, and can realize effective integration of information resources of different sewage treatment systems by using a data management system.
In step 1, the opening function of the inlet valve 10 under normal conditions is:
Figure BDA0001861887220000071
in the formula:
u1-inlet valve 10 opening degree;
Q1-inlet sewage flow rate, unit: cubic meters per second;
f is a function of the opening of the inlet valve 10 with respect to the flow;
L1pretreatment tank 11 level, unit: rice;
H1height of the pretreatment tank 11, unit: rice;
adopting integral separation type PID control, setting a threshold value epsilon to 0.05, and the opening function of the inlet valve 10 under the condition that the submersible sewage pump 13 suddenly stops running is as follows:
Figure BDA0001861887220000072
in the formula: t-inlet valve 10 controls the sampling period, unit: second;
kp-proportional gain coefficient of inlet valve 10 control;
TIinlet valve 10 controls the integration time;
TDinlet valve 10 controls the differential time;
e1(k) deviation value of opening of inlet valve 10, e, input at the kth sampling moment1(k)＝f(Q1)；
u1(k) The valve opening output value of the inlet valve 10 at the kth sampling instant.
In the step 3, the PLC control center 7 adopts an integral separation type PID to control the rotating speed of the motor of the dosing pump 19, and the specific method is as follows:
when the turbidity of the sewage in the aeration filter 24 is not different from the discharge standard, the rotating speed of the dosing pump 19 is kept unchanged; when the turbidity of the aeration filter 24 is larger than the discharge standard, the dosing pump 19 is accelerated to operate; when the turbidity of the aeration filter 24 is smaller than the discharge standard, the dosing pump 19 is decelerated.
The control function of the motor speed of the dosing pump 19 is as follows:
Figure BDA0001861887220000081
Figure BDA0001861887220000082
in the formula:
T2dosing pump 19 motor controlled sampling period, unit: second;
Kp2-dosing pump 19 motor control proportional gain factor;
TI2-dosing pump 19 motor control integration time;
TD2-dosing pump 19 motor control differential time;
Qat presentThe current actual flow rate of the dosing pump 19, in units: cubic meters per second;
QdosingDosing pump 19 rated flow, unit: cubic meters per second;
ndosing-rated speed of dosing pump 19, in units: rotating per minute;
e2(k) -input of kth sampling instantThe deviation value of the motor rotating speed of the dosing pump 19;
Δu2(k) and adjusting the output value of the rotational speed and the opening degree of the motor of the dosing pump 19 at the kth sampling moment.

Claims (1)

1. A working method of a green ecological sewage treatment control system comprises a PLC control center (7), an upper computer (36), a power system, a collection system, a treatment system and a recycling system; the PLC control center (7) is electrically connected with the upper computer (36), the power system, the collecting system, the processing system and the recycling system, and the PLC control center (7) is used for controlling the collecting system, the processing system and the recycling system to work; the upper computer (36) is connected with the PLC control center (7) through an Ethernet cable; the power system provides electric energy for the whole green ecological sewage treatment control system; the power system comprises a wind driven generator (1), a solar panel (2), a wind-solar hybrid controller (3), a storage battery pack (4), a motor power supply (5) and an inverter (6), wherein the wind driven generator (1) and the solar panel (2) are both electrically connected with the input end of the wind-solar hybrid controller (3), the storage battery pack (4) is respectively electrically connected with the output end of the wind-solar hybrid controller (3) and the inverter (6), and the motor power supply (5) and the inverter (6) are both electrically connected with the PLC control center (7); the collecting system comprises a domestic sewage collecting device (8), a rainwater collecting device (9), an inlet valve (10), a pretreatment tank (11), a grating machine (12), a first liquid level meter (20) and a first turbidity meter (21), wherein the domestic sewage collecting device (8) and the rainwater collecting device (9) are connected with the inlet valve (10) through pipelines, the inlet valve (10) is connected with the grating machine (12) through a pipeline, the inlet valve (10) is in communication connection with a PLC (programmable logic controller) control center (7), and the grating machine (12) is arranged at an inlet of the pretreatment tank (11); the first liquid level meter (20) and the first turbidity meter (21) are both arranged on the pretreatment tank (11), and the first liquid level meter (20) and the first turbidity meter (21) are both in communication connection with the PLC control center (7); the treatment system comprises a submersible sewage pump (13), a sedimentation tank (14), a flocculation stirrer (15), a mixing stirrer (16), a dosing tank (17), a first flowmeter (18), a dosing pump (19), a second turbidity meter (22), a blower (23), an aeration filter (24), a sludge pump (25), a sludge tank (26), an oxygen dissolving instrument (27), a waste gas concentration sensor (28), a ventilator (29), a second flowmeter (34) and a second liquid level meter (35), the submersible sewage pump (13) and the flocculation stirrer (15) are both arranged in the sedimentation tank (14), a first flow meter (18) is arranged on the submersible sewage pump (13), the first flow meter (18) is in communication connection with the PLC control center (7), the submersible sewage pump (13) and the flocculation stirrer (15) are connected with the PLC control center (7) through frequency converters; the dosing tank (17) is connected with the sedimentation tank (14) through a pipeline, the mixing stirrer (16) is arranged in the dosing tank (17), and the mixing stirrer (16) is connected with the PLC control center (7) through a frequency converter; the dosing pump (19) is arranged on a pipeline between the dosing tank (17) and the sedimentation tank (14), the second flowmeter (34) is arranged on the dosing pump (19), the dosing pump (19) is connected with the PLC control center (7) through a frequency converter, and the second flowmeter (34) is in communication connection with the PLC control center (7); the aeration filter tank (24) is connected with the sedimentation tank (14), the blower (23) and the sludge tank (26) through pipelines, and the blower (23) is connected with the PLC control center (7) through a frequency converter; the second turbidimeter (22) and the oxygen dissolving instrument (27) are arranged on the aeration filter pool (24), and the second turbidimeter (22) and the oxygen dissolving instrument (27) are in communication connection with the PLC control center (7); the sludge pump (25) is arranged on a pipeline between the aeration filter tank (24) and the sludge tank (26), and the sludge pump (25) and the left-falling fan (29) are connected with the PLC control center (7) through a frequency converter; the waste gas concentration sensor (28) is in communication connection with the PLC control center (7); the second liquid level meter (35) is arranged on the sedimentation tank (14), and the second liquid level meter (35) is in communication connection with the PLC control center (7); the recycling system comprises a self-sucking pump (30), an artificial lake (31), a pressurizing pump (32) and an irrigation valve (33), wherein the self-sucking pump (30) is connected with the artificial lake (31) through a pipeline; the pressure pump (32) is connected with the artificial lake (31) through a pipeline, an irrigation valve (33) is arranged at the outlet of the pressure pump (32), the self-sucking pump (30) and the pressure pump (32) are both connected with the PLC control center (7) through a frequency converter, and the irrigation valve (33) is in communication connection with the PLC control center (7);
the working method is characterized by comprising the following steps:
step 1, collecting the sewage by a domestic sewage collecting device (8) and a rainwater collecting device (9), enabling the sewage to flow into a pretreatment tank (11) through an inlet valve (10), removing solid impurities with large volume in the sewage by a grating machine (12) positioned at the inlet of the pretreatment tank (11), and feeding back the liquid level L of the pretreatment tank (11) according to a first liquid level meter (20)1The opening degree of the inlet valve (10) is controlled by a PLC control center (7);
the inlet valve (10) opening function is normally:
Figure FDA0003143623170000021
in the formula:
u1-inlet valve (10) opening;
Q1-inlet sewage flow rate, unit: cubic meters per second;
f is a function of the opening of the inlet valve (10) with respect to the flow;
L1-pretreatment tank (11) level, unit: rice;
H1-height of the pretreatment tank (11), unit: rice;
the integral separation type PID control is adopted, a threshold value epsilon is set to be 0.05, and the opening function of the inlet valve (10) under the condition that the submersible sewage pump (13) suddenly stops running is as follows:
Figure FDA0003143623170000022
in the formula: t-inlet valve (10) controls the sampling period, unit: second;
kp is the proportional gain coefficient controlled by the inlet valve (10);
TI-inlet valve (10) controlling integration time;
TD-the inlet valve (10) controls the differential time;
e1(k) -deviation value of opening of inlet valve (10) inputted at kth sampling moment, e1(k)＝f(Q1)；
u1(k) -the valve opening output value of the inlet valve (10) at the kth sampling moment;
step 2, enabling the sewage to flow into the sedimentation tank (14), and feeding back the liquid level L of the sedimentation tank (14) according to the second liquid level meter (35)2The PLC control center (7) controls the start and stop of the submersible sewage pump (13); when L is2When the height of the 2/3 submersible sewage pump (13) is reached, the PLC control center (7) starts the submersible sewage pump (13); when L is2The height of the submersible sewage pump (13) is less than 2/3, and the PLC control center closes the submersible sewage pump (13); the first flowmeter (18) feeds back the sewage flow Q1To the PLC control center (7), the PLC control center (7) controls the rotating speed of the submersible sewage pump (13) to adjust the sewage flow Q1(ii) a The waste gas concentration sensor (28) feeds back the waste gas concentration in the system to the PLC control center (7), and the PLC control center (7) controls the rotating speed of the ventilator (29) to adjust the flow rate of the waste gas;
step 3, measuring the turbidity of the sewage at the inlet of the pretreatment tank (11) according to a first turbidity meter (21), and adding medicine into the sedimentation tank (14) through a medicine adding pump (19) by a medicine adding tank (17) after calculation; feeding back the turbidity of the aeration filter (24) by a second turbidity meter (22), feeding back the flow of the dosing pump (19) by the second flow meter (34) to a PLC (programmable logic controller) control center (7), and controlling the start and stop of a mixing stirrer (16), the start and stop of a flocculation stirrer (15) and the motor rotating speed of the dosing pump (19) by the PLC control center (7) until the turbidity in the aeration filter (24) reaches the discharge standard that suspended matters ss is less than or equal to 10 mg/L;
when the turbidity of the sewage in the aeration filter (24) is not different from the discharge standard, the rotating speed of the dosing pump (19) is kept unchanged; when the turbidity of the aeration filter (24) is larger than the discharge standard, the dosing pump (19) is accelerated to run; when the turbidity of the aeration filter (24) is smaller than the discharge standard, the dosing pump (19) is decelerated;
the control function of the motor speed of the dosing pump (19) is as follows:
Figure FDA0003143623170000031
Figure FDA0003143623170000032
in the formula:
T2-the dosing pump (19) motor controls the sampling period in units of: second;
Kp2-the dosing pump (19) motor control proportional gain factor;
TI2-dosing pump (19) motor control integration time;
TD2-the dosing pump (19) motor controls the differential time;
Qat present-current actual flow rate of dosing pump (19) in units of: cubic meters per second;
Qdosing-rated flow rate of dosing pump (19), in units of: cubic meters per second;
ndosing-nominal rotational speed of the dosing pump (19), in units of: rotating per minute;
e2(k) the deviation value of the motor rotating speed of the dosing pump (19) input at the kth sampling moment;
Δu2(k) adjusting the output value of the motor speed and the opening degree of the dosing pump (19) at the kth sampling moment;
step 4, sewage enters the aeration filter (24) from the sedimentation tank (14), the PLC control center (7) controls the start and stop of the air blower (23), the oxygen content in the aeration filter (24) is fed back to the PLC control center (7) by the oxygen dissolving instrument (27), when the dissolved oxygen concentration is lower than 4mg/L, the PLC control center (7) controls the rotating speed of the air blower (23) to increase, so that the dissolved oxygen concentration reaches the requirement of 9mg/L, and the sewage flows out through membrane filtration in the aeration filter (24); the PLC control center (7) starts a sludge pump (25) to discharge sludge from the aeration filter (24) to a sludge tank (26);
step 5, the PLC control center (7) controls the start and stop of a self-sucking pump (30), the self-sucking pump (30) sucks water in an aeration filter (24) into an artificial lake (31), and the PLC control center (7) controls the start and stop of a pressurizing pump (32) and the opening degree of an irrigation valve (33) in an irrigation system to irrigate the outside.
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