CN110921946A

CN110921946A - Small integrated organic wastewater treatment control system and control method thereof

Info

Publication number: CN110921946A
Application number: CN201911342995.9A
Authority: CN
Inventors: 纪辉; 李欧阳; 聂松林; 冯欣
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2020-03-27

Abstract

The invention discloses a small integrated organic waste water treatment control system and a control method thereof. The system comprises a controller module, a waste water pretreatment module, an advanced oxidation module, a detection module and a purified water discharge module, which are used for circulating purification in the device. Wastewater, the device adopts advanced oxidation method to treat wastewater, adopts cavitation method, combined with the injection of high concentration of oxygen-active particles to oxidize organic matter, and the oxidized wastewater is sent to a centrifugal solid-liquid separator to enhance the solid waste. remove. The whole device is integrated in a cuboid frame, which is small in size and easy to transport. It simplifies the operation of each link, reduces the difficulty of use, and realizes the efficient, green, and integrated treatment of organic wastewater. It is small in size and can be used in scenarios Rich.

Description

Small integrated organic wastewater treatment control system and control method thereof

Technical Field

The invention relates to the technical field of organic wastewater treatment, in particular to a small integrated organic wastewater treatment control system taking an advanced oxidation technology as a core and a control method thereof.

Background

Along with the rapid development of urbanization construction and society, the water consumption and the sewage discharge amount of industry, agriculture and living are greatly increased, but the relative lag of the waste water treatment facilities enables a large amount of waste water to be directly discharged without treatment, so that the surrounding environment and human life are greatly threatened. Most of the components of the wastewater are organic matters, and the organic wastewater not only has corrosiveness and toxicity, but also is difficult to biodegrade. If the waste water is directly discharged into natural water without treatment or treatment failure, not only can the water be polluted, but also the water quality of rivers and lakes can be damaged; if the water enters a human body as domestic water through a water circulation system, the water can easily cause carcinogenesis, teratogenesis and even gene mutation of the human body. Therefore, the random discharge of domestic wastewater which is not properly treated seriously threatens the ecological environment and human health; in addition, the existing wastewater treatment equipment has large occupied area, complex process and difficult degradation of partial organic matters, and most of the equipment needs to be added with an oxidant, so that the storage and the use of the oxidant can cause certain influence on the environment.

Advanced Oxidation Processes (AOPs) are also called deep Oxidation technologies, and are characterized in that hydroxyl radicals (OH) with strong Oxidation capability are generated, and under the reaction conditions of high temperature, high pressure, electricity, sound, light irradiation, catalysts and the like, the hydroxyl radicals (OH) with strong Oxidation capability are generated, can perform series of radical chain reactions with organic pollutants to destroy the structure of the organic pollutants, so that the organic pollutants are gradually degraded into harmless low molecular weight organic matters, and are finally mineralized into CO₂、H₂O and other mineral salts. The hydroxyl radical is an important active oxygen, has extremely strong oxidizing capacity, has the oxidation potential of 2.8V, is an oxidizing agent which is second to the strongest fluorine in nature, is 1.35 times of ozone, can perform quick chain reaction with most organic pollutants, mineralizes harmful substances without selectivity, has no secondary pollution, and is the best green oxidizing agent in theory and practice. The current advanced oxidation technology is generally single in use and poor in effect, and the combined use of advanced oxidation can effectively improve the efficiency of advanced oxidation.

At present, the organic wastewater is treated by adopting three-stage treatment of a wastewater treatment system, the occupied area is large, the treatment time is long, and the treatment equipment is fixed and expensive. And for occasions with remote positions and unfavorable transportation of the wastewater, the transportation cost is high. Therefore, a small integrated organic wastewater treatment device is needed, the device is small in size, convenient to move and transport, capable of having autonomous working capacity, energy-saving and emission-reducing, free of adding oxidant and green and pollution-free in treatment process. The transportation of the wastewater treatment device is convenient, no region limitation exists, and the wastewater treatment device can be used in parallel for large-batch wastewater, so that the treatment of the large-batch wastewater is met.

Disclosure of Invention

The invention aims to provide a small integrated organic wastewater treatment control system and a control method, which realize the small, movable and green treatment of a wastewater treatment device.

The purpose of the invention is realized by the following technical scheme:

a small-size integrated form organic waste water treatment control system which characterized in that: the control system comprises a pretreatment module, an advanced oxidation module, a purified water discharge module, a detection module and a control module,

the controller module comprises a pretreatment control module, an advanced oxidation control module and a purified water discharge control module;

the pretreatment control module controls the operation of the pretreatment module by controlling the starting and stopping of the centrifugal pump and the opening and closing of the switch valve, and controls the starting of a backwashing mode of the backwashing filter to perform backwashing on the filter;

the advanced oxidation module comprises a pressure pump, a self-oscillation impinging stream cavitator, a self-oscillation efficient mixer, a plasma discharge device, an oxygen generator, a high-frequency high-voltage power supply and an ultrasonic generator. The advanced oxidation control module controls the operation of the advanced oxidation module by controlling a pressure pump, a high-frequency high-voltage power supply, an oxygen generator and an ultrasonic generator;

the purified water discharging module comprises a centrifugal pump, a centrifugal solid-liquid separator and a switch valve. The purified water discharge control module controls the operation of the purified water discharge module by controlling the starting and stopping of the centrifugal pump, the opening and closing of the switch valve and the starting and stopping of the centrifugal solid-liquid separator.

The detection module is communicated with the controller module through an RS-485 cable and comprises a first liquid level meter and a second liquid level meter which are respectively arranged corresponding to the wastewater pool and the liquid storage tank; the detection module is provided with a PH meter, a temperature sensor and a COD sensor at the position of the liquid storage tank and is used for detecting the PH value, the temperature and the COD value of the wastewater in the liquid storage tank; the detection module is provided with an electromagnetic flowmeter and a pressure transmitter at the outlet of the booster pump and is used for detecting the flow and the pressure of the wastewater entering the advanced oxidation device; and the detection module is a gas flowmeter arranged at the joint of the industrial oxygen generator and the plasma discharge device.

The control system can adjust the frequency and the voltage of the plasma power supply according to the concentration of the wastewater to control the intensity of the generated plasma.

The control system can adjust the pressure of the pressurizing pump according to the concentration of the wastewater, and further adjust the cavitation strength.

The pretreatment control module controls a backwashing mode by detecting the pressure difference of a backwashing filter, and controls the start and stop of the pretreatment module according to the liquid level information of a first liquid level meter in the wastewater pool and a second liquid level meter in the liquid storage tank; the advanced oxidation treatment control module controls the start and stop of the advanced oxidation module according to data detected by a second liquid level meter and a COD sensor arranged in the liquid storage tank; the purified water discharging module controls the start and stop of the purified water discharging module according to the second liquid level meter and data detected by a COD sensor arranged in the liquid storage tank.

The control method is that the pretreatment control module starts a first centrifugal pump and an electric valve, wastewater in a wastewater pool is pumped into the pretreatment module, the wastewater is filtered and introduced into a liquid storage tank through a backwashing filter, the backwashing filter can start a backwashing mode for backwashing, the wastewater generated in the backwashing mode flows back into the wastewater pool, the pretreatment mode is closed after the liquid in the liquid storage tank is filled, the advanced oxidation module controller controls to start an advanced oxidation module, the wastewater in the liquid storage tank is pumped and pressurized by a pressurizing pump and enters a self-oscillation counter-collision cavitator through a branch pipe to generate hydrodynamic cavitation, the rear end of the self-oscillation cavitator is connected with a self-oscillation efficient flow mixer, the self-oscillation efficient flow mixer introduces oxygen active particles generated by an atmospheric pressure ionization device into the wastewater, fully mixes the oxygen active particles and introduces the oxygen active particles into the liquid storage tank, and an ultrasonic generator is placed in the liquid storage, to generate acoustic cavitation within the reservoir and to accelerate mass transfer of the oxygen reactive particles. The advanced oxidation module circularly operates to treat the wastewater. After the standard is detected by the COD sensor, the advanced oxidation module is closed; the purified water discharge control module controls the purified water discharge module to be opened, the second electric switch valve is opened, liquid in the liquid storage tank is pumped out by the second centrifugal pump and passes through the centrifugal solid-liquid separator, and solid matters in the liquid are separated by the centrifugal solid-liquid separator.

And wastewater in the advanced oxidation module is subjected to circular treatment. A container for storing purified water is arranged behind the purified water discharge module, and the purified water in the container can be selectively discharged or recycled.

The equipment for executing the process is arranged in a small cuboid frame, and has the advantages of compact structure, small volume and convenient transportation.

Compared with the prior art, the small integrated organic wastewater treatment control system and the control method thereof provided by the invention have the following gain effects:

(1) the small integrated organic wastewater treatment control system integrates the oily wastewater treatment process into a small rectangular frame, has compact structure and small volume, is convenient to transport, can be suitable for multiple scenes, and meets the requirements of small enterprises on wastewater treatment.

(2) The invention couples a plurality of advanced oxidation technologies in the same integrated device, realizes the synergistic effect of various advanced oxidation technologies, does not use chemical additives, and has green and pollution-free treatment process.

(3) The invention automates the organic wastewater treatment process, can work safely and stably without human participation in the process, and achieves the optimization of energy utilization by automatically adjusting corresponding working parameters through the controller.

Drawings

FIG. 1 is a schematic diagram showing the structure of each module of a small-scale integrated organic wastewater treatment control system provided by the invention.

FIG. 2 is a schematic view of a small-scale integrated organic wastewater treatment control system provided by the invention.

FIG. 3 is a schematic diagram of control modules of the control system.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1, a small-sized integrated organic wastewater treatment control system comprises five parts, namely a controller module 1, a pretreatment module 2, an advanced oxidation module 3, a detection module 4 and a purified water discharge module 5.

As shown in fig. 2, the integrated organic wastewater treatment control system comprises an upper computer 6, a PLC controller 7, a wastewater tank 9, a first liquid level meter 8, a first electric switch valve 10, a first centrifugal pump 11, a backwashing filter 12, a liquid storage tank 18, an ultrasonic generator 13, a PH meter 14, a temperature sensor 15, a COD sensor 16, a second liquid level meter 17, a booster pump 19, a pressure transmitter 21, an electromagnetic flow meter 22, an electric pressure regulating valve 20, a self-oscillation impinging flow cavitator 23, a self-oscillation efficient mixer 24, an industrial oxygen generator 25, a gas flow meter 26, an atmospheric pressure ionization discharge device 27, a second centrifugal pump 28, a second electric switch valve 29, and a centrifugal solid-liquid separator 30.

As shown in fig. 3, the controller module 1 includes a pretreatment control module 32, an advanced oxidation control module 33, and a clean water discharge control module 34.

Referring now to fig. 1, a controller module 1, controller module 1 includes host computer 6 and PLC controller 7, and controller module 1 is connected with detection module 4, detection module 4 is used for detecting the flow, pressure, the COD value of liquid and each liquid storage device liquid level in the waste water treatment process. The controller module 1 is connected with the pretreatment module 2, the advanced oxidation module 3 and the purified water discharge module 5, and the controller module 1 controls the operation of each treatment module according to data fed back by the detection module 4.

Referring now to fig. 2, a small-sized integrated organic wastewater treatment control system is schematically shown, which has an upper computer 6 and a PLC controller 7, wherein the upper computer 6 is used as a man-machine interface to issue operation commands and display operation states. The PLC 7 is used for receiving the information of each detection instrument to control the normal operation of the equipment. The waste water is pumped in by the first centrifugal pump 11, impurities with the size of more than 40 mu m are filtered by the back flush filter 12, and the filtered waste water is introduced into the liquid storage tank 18. The waste water in the liquid storage tank 18 is pressurized and pumped by a pressurizing pump 19, the pressure of the waste water is adjusted by an electric pressure regulating valve 20, the waste water flows through a self-oscillation clashing cavitator 23 to generate hydrodynamic cavitation, hydroxyl radicals generated by the hydrodynamic cavitation are free to degrade the waste water primarily based on the reaction of the waste water, negative pressure is formed in the self-oscillation high-efficiency mixer 24 after flowing through the self-oscillation high-efficiency mixer 24, oxygen active particles generated by an atmospheric pressure plasma discharge device 27 are sucked into the self-oscillation high-efficiency mixer 24 by the negative pressure and are efficiently mixed with the waste water, and the mass transfer efficiency is increased. The energetic oxygen reactive particles are generated by an atmospheric pressure plasma discharge device 27 supplied with oxygen from an industrial oxygen generator 25. Oxygen is discharged through a double-medium plasma discharge tube in the atmospheric pressure plasma discharge device 27 by the energy provided by an internal high-frequency high-voltage power supply, and oxygen active particles are generated. The wastewater is finally introduced into a liquid storage tank 18, an ultrasonic generator 13 is arranged in the liquid storage tank 18, the ultrasonic generator 13 injects strong ultrasonic energy into the liquid in the liquid storage tank 18 through a plurality of vibration surfaces to form acoustic cavitation, further carry out advanced oxidation and strengthen the mass transfer of oxygen active particles to the wastewater. The waste water solution is circularly oxidized in the advanced oxidation module. After treatment is complete, it is pumped by the second centrifugal pump 28 and passed through the centrifugal solid liquid separator 30, where the solids from the advanced oxidation process are removed and the purified water can be recycled or discharged directly.

A control method for a small-sized integrated organic wastewater treatment control system comprises the following steps:

the method comprises the following steps: the organic wastewater is stored in the wastewater tank 8, the first centrifugal pump is used for pumping out the wastewater in the wastewater tank 8 and enabling the wastewater to flow through the backwashing filter 12, the wastewater generated by backwashing of the backwashing filter 12 flows back to the wastewater tank 8, the liquid level information measured by the second liquid level meter 17 is transmitted to the controller module 1 to control the starting and stopping of the first centrifugal pump 11 and the opening and closing of the first electric switch valve 10, when the liquid in the liquid storage tank 18 is lower than a certain liquid level, the first centrifugal pump 11 and the first electric switch valve 10 are opened, and when the liquid in the liquid storage tank 18 is higher than the certain liquid level, the first centrifugal pump 11 and the first electric switch valve 10 are closed.

Step two: after the liquid in the liquid storage tank 18 is full, the controller module 1 starts the pressure pump 19, the industrial oxygen generator 25, the atmospheric pressure ionization discharge device 27 and the ultrasonic generator 13 to oxidize the wastewater, the advanced oxidation module is a circulating system, the wastewater is subjected to circulating oxidation treatment in the advanced oxidation module, and the COD sensor is used for detecting whether the COD value is lower than the discharge standard of the wastewater. The pressure of the circulation system and the power of the discharge device are controlled according to the data detected by the PH meter 14 and the temperature sensor 15 so as to achieve the optimal utilization of energy.

Step three: when the COD sensor 16 detects that the COD value is lower than the discharge standard of the wastewater, the controller module 1 closes the pressure pump 19, the industrial oxygen generator 25, the atmospheric pressure ionization discharge device 27 and the ultrasonic generator 13, then starts the second centrifugal pump 28, the second switch valve 29 and the centrifugal solid-liquid separator 30, pumps the wastewater after the advanced oxidation treatment out of the liquid storage tank 18, separates the solids generated by the advanced oxidation treatment by the centrifugal solid-liquid separator 30, and finally, the generated purified water can be recycled or directly discharged.

The controller module controls the rotation speed of the pressure pump 19, the opening of the electric pressure regulating valve 20, the flow of the oxygen generator 31 and the power of the plasma discharge device 29 according to data fed back by the COD sensor 16, so as to achieve the purpose of optimizing energy.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent methods, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. a small-scale integrated organic waste water treatment control system is characterized in that: the described treatment control system comprises a pretreatment module, an advanced oxidation module, a purified water discharge module, a detection module and a controller module;

The controller module includes a pretreatment control module, an advanced oxidation control module, and a purified water discharge control module;

The pretreatment module includes a centrifugal pump, an on-off valve and a backwash filter. The pretreatment control module controls the operation of the pretreatment module by controlling the start and stop of the centrifugal pump and the opening and closing of the on-off valve, and controls the backwash filter by controlling the backwash filter. The filter is backwashed when the flushing mode is turned on;

The advanced oxidation module includes a pressurized pump, a self-excited oscillation collision flow cavitator, a self-excited oscillation high-efficiency mixer, a plasma discharge device, an oxygen generator, a high-frequency high-voltage power supply and an ultrasonic generator, and an advanced oxidation control module. Control the operation of the advanced oxidation module by controlling the booster pump, high-frequency high-voltage power supply, oxygen generator, and ultrasonic generator;

The clean water discharge module includes a centrifugal pump, a centrifugal solid-liquid separator, and an on-off valve; the clean water discharge control module controls the on-off of the centrifugal pump, the on-off of the on-off valve and the on-off of the centrifugal solid-liquid separator. Control the operation of the clean water discharge module;

The detection module communicates with the controller module through an RS-485 cable, and includes a first liquid level gauge and a second liquid level gauge respectively set corresponding to the waste water tank and the liquid storage tank; the detection module is set at the liquid storage tank. The PH meter, temperature sensor and COD sensor are used to detect the PH value, temperature, chemical oxygen demand and COD value of the wastewater in the liquid storage tank; the electromagnetic flowmeter and pressure transmitter set at the outlet of the plunger pump of the detection module The device is used to detect the flow and pressure of the wastewater entering the advanced oxidation device; the detection module is a gas flow meter set at the connection between the industrial oxygen generator and the plasma discharge device.

2 . The small integrated organic wastewater treatment control system according to claim 1 , wherein the control system can control the intensity of plasma generation by adjusting the frequency and voltage of the plasma power source according to the concentration of the wastewater. 3 .

3 . The small integrated organic wastewater treatment control system according to claim 1 , wherein the control system adjusts the pressure of the pressurizing pump according to the wastewater concentration, thereby adjusting the intensity of cavitation. 4 .

4. A small-scale integrated organic wastewater treatment control system according to claim 1, characterized in that: the pretreatment control module controls the backflushing mode by detecting the pressure difference of the backflushing filter, according to the The liquid level information of the first liquid level gauge and the second liquid level gauge in the liquid storage tank controls the start and stop of the preprocessing module; the advanced oxidation control module is based on the second liquid level gauge and the COD sensor set in the liquid storage tank. The detected data controls the start and stop of the advanced oxidation module; the clean water discharge module controls the start and stop of the clean water discharge module according to the data detected by the second liquid level gauge and the COD sensor provided in the liquid storage tank.

5. A control method for a small-scale integrated organic waste water treatment system using the system of claim 1, characterized in that it comprises the following steps, wherein the pretreatment control module turns on the first centrifugal pump, the electric valve, and the The waste water in the waste water tank is pumped into the pretreatment module, and the waste water is filtered into the liquid storage tank through the backwash filter. The backwash filter can be turned on in the backwash mode for backwashing, and the waste water generated in the backwash mode is returned to the waste water tank. , After the liquid in the liquid storage tank is full, the pretreatment mode is turned off, the advanced oxidation module controller controls the opening of the advanced oxidation module, and the waste water in the liquid storage tank is pumped out and pressurized by the pressure pump, and enters the automatic Hydraulic cavitation is generated in the oscillating collision flow cavitator. The back end of the self-excited oscillation cavitation is connected with a self-excited oscillation high-efficiency mixer. The self-excited oscillation high-efficiency mixer introduces the oxygen active particles generated by the atmospheric pressure ionization device into the wastewater. The ultrasonic generator is placed in the liquid storage tank to generate acoustic cavitation and accelerate the mass transfer of oxygen-active particles in the liquid storage tank; the advanced oxidation module circulates The wastewater is treated during operation; after the COD sensor detects that the advanced oxidation module is up to standard, the advanced oxidation module is turned off; the water purification discharge control module controls the water purification discharge module to open, opens the second electric switch valve, and the liquid in the liquid storage tank is pumped out by the second centrifugal pump, After the centrifugal solid-liquid separator, the centrifugal solid-liquid separator will separate the solids in the liquid.

6 . The control method of a small-scale integrated organic wastewater treatment system according to claim 5 , wherein the wastewater in the advanced oxidation module is recycled. 7 .

7 . The control method of a small integrated organic wastewater treatment system according to claim 5 , wherein a container for storing purified water is located behind the purification water discharge module, and the purified water in the container is selectively discharged or recycled. 8 .

8 . The control method of a small integrated organic wastewater treatment system according to claim 5 , wherein the control system is installed in a cuboid frame. 9 .