CN211664848U - Automatic dosing system for printing and dyeing wastewater treatment system - Google Patents
Automatic dosing system for printing and dyeing wastewater treatment system Download PDFInfo
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- CN211664848U CN211664848U CN201922130298.9U CN201922130298U CN211664848U CN 211664848 U CN211664848 U CN 211664848U CN 201922130298 U CN201922130298 U CN 201922130298U CN 211664848 U CN211664848 U CN 211664848U
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Abstract
The utility model discloses an automatic dosing system used in a printing and dyeing wastewater treatment system, which comprises a physicochemical sedimentation tank dosing system and a Fenton reaction tank dosing system, wherein the physicochemical sedimentation tank dosing system comprises an inorganic flocculant dosing tank, a first liquid caustic soda dosing tank, a first organic flocculant dosing tank and dosing units arranged in the corresponding dosing tanks; the Fenton reaction pond includes oxidation zone and neutralization area, Fenton reaction pond charge system is including adding medicine pond and the sulphuric acid with the Fenton reagent of oxidation zone intercommunication respectively with the pond and the sulphuric acid of adding medicine pond, respectively with the second liquid caustic soda of neutralization area intercommunication add medicine pond and the organic flocculating agent of second add medicine pond and set up the medicine unit that adds in the medicine pond that corresponds, add the medicine unit and include charge device and monitoring devices, charge device is including the medicine storage tank that connects gradually, add medicine pump and medicament electromagnetic flow meter and be connected with PLC respectively. The utility model discloses an automatic adjustment charge system's operational aspect improves waste water treatment stability, reduces treatment cost.
Description
Technical Field
The utility model relates to a sewage treatment plant technical field especially relates to an automatic reagent feeding system for among printing and dyeing wastewater treatment system.
Background
The printing and dyeing wastewater is a main source of pollution in the textile industry and has the characteristics of large wastewater amount, high COD (chemical oxygen demand), difficult degradation and high chromaticity. Along with the enhancement of domestic environmental protection consciousness, the discharged water amount is further reduced, the index of discharged wastewater is reduced, and the requirement on printing and dyeing wastewater treatment is further improved.
Printing and dyeing wastewater treatment system among the prior art generally includes materialization reaction system, biochemical reaction system and fenton reaction system, utilizes the flocculating agent to carry out the flocculation and precipitation to the pollutant in the waste water among the materialization reaction system, utilizes the organic matter in the microorganism preliminary removal waste water among the biochemical reaction system, utilizes the organic matter in the fenton reaction system further degradation waste water. For example, in chinese patent document, "a system and a process for treating leather printing and dyeing wastewater", disclosed in chinese patent document No. CN110282813A, the treatment system includes a physicochemical reaction system, a biochemical reaction system, and a fenton reaction system, the physicochemical reaction system includes a fast mixing tank 1, a fast mixing tank 2, a slow mixing tank, and a primary settling tank, the biochemical reaction system includes an a/O tank and a secondary settling tank, and the fenton reaction system includes a fenton chemical adding tank, a fenton reaction tank, a flocculation tank, and a tertiary settling tank.
In the treatment process of printing and dyeing wastewater, a plurality of chemical agents are needed in a physicochemical reaction system and a Fenton reaction system, and in the treatment system in the prior art, the chemical agents are generally added manually. Along with the requirement of the country on the discharge of printing and dyeing wastewater, the use of various chemicals is more frequent in the treatment process, so that the use amount of the medicines is difficult to accurately control through manual work, the medicine is easily wasted, or the medicines are not enough to be used, and a plurality of medicines are required to be mutually matched for use, so that the sewage station dosing system has the characteristics of high manual operation requirement, frequent operation, high operation risk, high labor cost and the like, and the treatment cost of sewage is increased.
Disclosure of Invention
The utility model relates to an overcome prior art's in-process of handling printing and dyeing waste water, add chemical agent through the manual work, hardly accurate control medicine quantity, cause the waste of medicine easily, perhaps use inadequately, and a lot of medicines need mutually support and use, make sewage station charge system have that manual operation requires highly, the operation is frequent, the operational risk is high, characteristics such as human cost height, the problem of the treatment cost of sewage has been increased, an automatic reagent feeding system for among the printing and dyeing waste water treatment system is provided, through PLC automatic control and traditional charge device cooperation, reach remote control charge system's purpose, make charge system can be according to the in-service behavior, the operational aspect of automatic adjustment charge system, improve printing and dyeing waste water treatment stability, reduce the sewage treatment cost.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an automatic dosing system used in a printing and dyeing wastewater treatment system comprises a physical and chemical precipitation tank and a Fenton reaction tank, wherein the automatic dosing system comprises a PLC (programmable logic controller), a physical and chemical precipitation tank dosing system and a Fenton reaction tank dosing system which are respectively connected with the PLC, and the physical and chemical precipitation tank dosing system comprises an inorganic flocculant dosing tank, a first liquid alkali dosing tank, a first organic flocculant dosing tank, an inorganic flocculant unit, a first liquid alkali dosing unit and a first organic flocculant dosing unit, wherein the inorganic flocculant dosing tank, the first liquid alkali dosing tank and the first organic flocculant dosing unit are mutually separated and respectively communicated with the physical and chemical precipitation tank; the Fenton reaction pond is including the oxidation zone and the neutralization zone that link to each other, Fenton reaction pond charge system is including separating each other and respectively with the Fenton reagent of oxidation zone intercommunication add medicine pond and sulphuric acid add medicine pond, separate each other and respectively with second liquid caustic soda of neutralization zone intercommunication add medicine pond and second organic flocculating agent add medicine pond to and the Fenton reagent that sets up in corresponding adding medicine pond adds medicine unit, sulphuric acid adds medicine unit, second liquid caustic soda adds medicine unit and second organic flocculating agent and adds the medicine unit, each adds medicine unit including charge device and the monitoring devices who is connected with PLC respectively, charge device is including the medicine storage tank, dosing pump and the medicament electromagnetic flow meter that loop through the pipe connection, charge pump and medicament electromagnetic flow meter are connected with PLC respectively.
The utility model discloses set up the divided pond of adding medicine of each other on materialization sedimentation tank and fenton reaction tank, and set up in each adds the medicine pond and add the medicine unit, through the monitoring devices real-time supervision inflow in each medicine unit, the circumstances of intaking such as pH, and transmit for PLC, PLC calculates required medicament dosage through monitoring signal, combine the signal of the transmission of medicine electromagnetic flowmeter in the charge device, the medicament volume of control medicament pump conveying, make each medicament carry and reach required volume, realize remote control medicine system's purpose, make medicine system can be according to the treatment conditions of reality, automatic adjustment and accurate control medicament quantity, improve printing and dyeing wastewater treatment stability, it is extravagant to reduce the medicament, reduce the sewage treatment cost.
An inorganic flocculant dosing tank, a first liquid caustic soda dosing tank, a first organic flocculant dosing tank and corresponding dosing units are arranged in the materialization sedimentation tank, the opening, closing and frequency of a pesticide pump in each dosing unit are controlled through a PLC (programmable logic controller), so that the inorganic flocculant and the organic flocculant reach the optimal matching ratio, the dosing amount of the liquid caustic soda is adjusted according to the using amount of the inorganic flocculant and the organic flocculant, the pH in the materialization sedimentation reaches the optimal flocculation condition, pollutants in the wastewater can be effectively coagulated and precipitated, and the treatment effect of the wastewater is improved.
Set up the Fenton reagent in the oxidation zone in the Fenton reaction pond and add the medicine pond with sulphuric acid to set up the corresponding medicine unit that adds in the medicine pond, PLC is according to the monitoring signal that adds the monitoring devices transmission in the medicine unit, calculate and control the Fenton reagent and throw the dosage, and through sulphuric acid charge device with the pH control in the effective range of Fenton reagent in oxidation zone, make the organic matter oxidation of Fenton reagent in can effectively with the waste water, improve the treatment effect of organic matter. And after wastewater in the oxidation area after being oxidized by the Fenton reagent enters the neutralization area, the pH of the wastewater is adjusted to a range suitable for subsequent treatment through the liquid caustic agent adding unit, and an organic flocculant is added through the second organic flocculant adding unit, so that the oxidized pollutants are subjected to flocculation and precipitation, and the treatment effect is further improved.
Preferably, in the inorganic flocculant dosing unit, a dosing pump in the dosing device is a metering pump, and the monitoring device is an electromagnetic water inlet flowmeter connected with a water inlet pipe. When the system is operated, the water inlet electromagnetic flowmeter transmits water inflow through signals, an operator sets the dosing percentage through the water inflow, the PLC converts the signals transmitted by the water inlet flowmeter into the dosing amount of the inorganic flocculant, and the dosing amount is conveyed by the metering pump through frequency conversion in combination with the signals transmitted by the medicament electromagnetic flowmeter, so that the inorganic flocculant is conveyed to reach the required amount.
Preferably, in the first and second liquid alkali dosing units, the dosing pump in the dosing device is a metering pump, and the monitoring device is a pH meter. An operator sets a water outlet pH interval in advance, the metering pump is started to operate when the pH is lower than the lower limit of the interval by combining a signal fed back by the pH meter, the dosage is controlled by frequency conversion through the pH meter feedback signal, and the dosing pump stops operating when the pH of the outlet water is higher than the interval value.
Preferably, in the first and second organic flocculant dosing units, a PAM automatic medicine machine is adopted as a medicine storage tank in the dosing device, and the dosing pump is a screw pump. The switch of a screw pump in the first organic flocculant dosing unit is connected with the switch of a medicine pump in the inorganic flocculant dosing unit through a PLC, the screw pump frequency is preset by an operator, the screw pump switch is connected with the medicine pump switch in the inorganic flocculant dosing unit, and after the medicine pump in the inorganic flocculant dosing unit is started, the screw pump in the first organic flocculant dosing unit is automatically started according to the set frequency after a proper time. The switch of the screw pump in the second organic flocculant dosing unit is connected with the switch of the drug pump in the second liquid alkali dosing unit through a PLC, the frequency of the screw pump is preset by an operator, and after the drug pump in the second liquid alkali dosing unit is started, the screw pump in the first organic flocculant dosing unit is automatically started according to the set frequency.
Preferably, the Fenton reagent dosing unit comprises a hydrogen peroxide dosing device, a ferrous iron dosing device and a monitoring device, the monitoring device comprises a water inlet electromagnetic flowmeter connected with a water inlet pipe and a pH meter arranged in an oxidation area, and dosing pumps in the hydrogen peroxide dosing device and the ferrous iron dosing device are metering pumps. When water enters the system and the pH value in the oxidation zone reaches a reaction pH range, the metering pumps in the ferrous iron dosing device and the hydrogen peroxide dosing device are automatically started, an operator sets two medicament dosing ratios, and the frequency of the metering pumps is automatically controlled by frequency conversion through a signal transmitted back by the water inlet electromagnetic flowmeter, so that the medicament dosing amount conforms to the set amount.
Preferably, in the sulfuric acid dosing unit, a dosing pump in the dosing device is a metering pump, and the monitoring device is a pH meter. Operating personnel sets up pH interval 2~4, and when pH was higher than 4 in the oxidation district, the measuring pump automatic reagent feeding combines the signal that the pH meter returned to pass through frequency conversion control dosing, keeps out water pH at 2~4 within ranges, ensures that the organic matter in the fenton reagent can effective oxidation waste water.
Preferably, a stirring device is arranged in each dosing tank. Ensure that the medicament and the waste water intensive mixing in each medicine pond, the signal of monitoring devices monitoring is accurate reliable.
Preferably, the dosing pump is provided with an automatic mode switch and a manual mode switch. The manual and automatic dosing modes can be switched by operators according to actual conditions, and equipment maintenance and management are facilitated.
Preferably, the pipelines before and after the screw pump are respectively provided with a control valve. Control valves are respectively arranged in front of and behind the screw pump, the control valve in front of the pump is used for cutting off the medicine feeding during maintenance, and the control valve behind the pump is used for protecting the screw pump.
Preferably, control valves are respectively arranged at the outlet of the medicine storage tank and on a pipeline in front of the metering pump, a y-type filter is arranged between the two control valves, a safety valve, a damper and a back pressure valve which are sequentially connected are arranged between the rear of the metering pump and the medicament electromagnetic flowmeter, and the safety valve is communicated with the medicine storage tank through a pipeline. The y-type filter is used for removing impurities in the medicament entering the metering pump; the safety valve is an overpressure protection device, and when the pressure in the medicine storage tank or the pipeline exceeds an allowable value, the safety valve is automatically opened to prevent the pressure from continuously rising; when the pressure is reduced to a specified value, the safety valve is automatically closed, so that the safe operation of the medicine storage tank and the pipeline is ensured; the damper is used for damping and dissipating energy; the backpressure valve and the damper are matched for use so as to reduce the damage of a water hammer to a system, reduce the peak value of flow velocity fluctuation of a medicament, protect a pipeline and a joint from being impacted by pressure fluctuation, and provide a good working environment for a metering pump.
Therefore, the utility model discloses following beneficial effect has:
(1) the system is stable in operation, the medicament is accurately used, the stability of wastewater treatment can be improved, the waste of the medicament can be reduced, and the wastewater treatment cost is reduced;
(2) the complex medicament adding operation is omitted, the personnel operation requirement is reduced, the operation is simple, and the labor cost is reduced.
Drawings
FIG. 1 is a schematic structural view of the chemical dosing system of the physical and chemical precipitation tank of the present invention;
FIG. 2 is a schematic structural view of the drug adding system of the Fenton reaction tank of the present invention;
FIG. 3 is a schematic diagram of the connection structure of the chemical adding devices in the inorganic flocculant chemical adding unit, the first and second liquid alkali chemical adding units, the Fenton reagent chemical adding unit and the sulfuric acid chemical adding unit;
FIG. 4 is a schematic view of the connection structure of the dosing devices in the first and second organic flocculant dosing units.
In the figure: 1 physicochemical sedimentation tank, 101 physicochemical sedimentation tank water inlet region, 1011 physicochemical sedimentation tank water inlet point, 102 inorganic flocculant dosing tank, 1021 inorganic flocculant dosing point, 103 first liquid caustic soda dosing tank, 1031 first liquid caustic soda dosing point, 1032 first liquid caustic soda dosing tank pH measurement point, 104 first organic flocculant dosing tank, 1041 first organic flocculant dosing point, 2 Fenton reaction tank, 21 oxidation region, 211 hydrogen peroxide dosing tank, 2111 hydrogen peroxide dosing point, 212 ferrous iron dosing tank, 2121 ferrous iron dosing point, 213 sulfuric acid dosing tank, 2131 Fenton reaction tank water inlet point, 2132 sulfuric acid dosing point, 2133 sulfuric acid dosing tank pH measurement point, 2134 oxidation region pH measurement point, 22 neutralization region, 221 second liquid caustic soda dosing tank, 2211 second liquid caustic soda dosing point, 2212 second liquid caustic soda dosing tank pH measurement point, 222 second organic flocculant dosing tank, 2221 a second organic flocculant dosing point, 3 an inorganic flocculant dosing device, 4 a liquid caustic soda dosing device, 5 a pH meter, 6 an organic flocculant dosing device, 7 a hydrogen peroxide dosing device, 8 a ferrous dosing device, 9 a sulfuric acid dosing device, 10 a dosing tank, 11 a metering pump, 12 a medicament electromagnetic flow meter, 13a control valve, 14 y type filter, 15 a safety valve, 16 a damper, 17 a back pressure valve, 18 PAM automatic medicine dosing machine, 19 a screw pump and 20 an inlet water electromagnetic flow meter.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description.
The drawings in the utility model are only schematic diagrams of the connection of each device, and do not represent actual placement and pipeline laying. The utility model provides a PLC, pH meter, pump, agitating unit etc. are the conventional device among the prior art, not the utility model discloses a key.
Example (b):
as shown in figures 1 and 2, the automatic dosing system for the printing and dyeing wastewater treatment system comprises a physical and chemical precipitation tank 1 and a Fenton reaction tank 2, and comprises a PLC, a physical and chemical precipitation tank dosing system and a Fenton reaction tank dosing system which are respectively connected with the PLC. The water inlet side of the physicochemical sedimentation tank 1 is provided with a physicochemical sedimentation tank water inlet area 101, an inorganic flocculant dosing tank 102, a first liquid alkali dosing tank 103 and a first organic flocculant dosing tank 104 which are separated from each other and are respectively communicated with the physicochemical sedimentation tank, and a physicochemical sedimentation tank water inlet point 1011 is arranged in the physicochemical sedimentation tank water inlet area.
The chemical precipitation tank dosing system comprises an inorganic flocculant dosing tank, a first liquid caustic soda dosing tank, a first organic flocculant dosing tank, and an inorganic flocculant dosing unit, a first liquid caustic soda dosing unit and a first organic flocculant dosing unit which are arranged in the corresponding dosing tanks.
Inorganic flocculating agent dosing point 1021 and agitating unit are equipped with in inorganic flocculating agent dosing tank 102, inorganic flocculating agent dosing unit is including inorganic flocculating agent dosing unit 3 and the monitoring devices who is connected with PLC respectively, monitoring devices is for advancing water electromagnetic flow meter 20 with advance water piping connection, inorganic flocculating agent dosing unit is including the medicine storage tank 10 that loops through the tube coupling, measuring pump 11 and medicament electromagnetic flow meter 12, inorganic flocculating agent dosing unit's pipeline lets in inorganic flocculating agent dosing point, add the inorganic flocculating agent dosing tank in with the polyferric.
Be equipped with first liquid caustic soda dosing point 1031 in the first liquid caustic soda dosing pond 103, first liquid caustic soda dosing pond pH measuring point 1032 and agitating unit, first liquid caustic soda dosing unit is including the liquid caustic soda charge device 4 and the monitoring devices who is connected with PLC respectively, monitoring devices is for setting up at the input pH meter 5 of first liquid caustic soda dosing pond pH measuring point, liquid caustic soda charge device includes the medicine storage tank through the tube coupling, measuring pump and medicament electromagnetic flowmeter, the pipeline of liquid caustic soda charge device lets in first liquid caustic soda dosing point, add first liquid caustic soda dosing pond with liquid caustic soda.
Be equipped with first organic flocculant dosing point 1041 and agitating unit in first organic flocculant dosing tank 104, first organic flocculant adds the medicine unit including organic flocculant charge device 6 and the monitoring devices who is connected with PLC respectively, monitoring devices is the electromagnetic flowmeter 20 of intaking with advancing water piping connection, organic flocculant charge device is including the PAM automation medicine machine 18 that loops through the tube coupling, screw pump 19 and medicament electromagnetic flowmeter 12, organic flocculant charge device's pipeline lets in first organic flocculant dosing point, add organic flocculant PAM into organic flocculant dosing tank. The switch of the screw pump in the first organic flocculant dosing unit is connected with the switch of the metering pump in the inorganic flocculant dosing unit through a PLC.
The Fenton reaction tank 2 comprises an oxidation area 21 and a neutralization area 22 which are connected, a Fenton reagent dosing tank and a sulfuric acid dosing tank 213 which are mutually separated and respectively communicated with the oxidation area are arranged on the water inlet side of the oxidation area, the Fenton reagent dosing tank comprises a hydrogen peroxide dosing tank 211 and a ferrous iron dosing tank 212, and a second liquid caustic soda dosing tank 221 and a second organic flocculant dosing tank 222 which are mutually separated and respectively communicated with the neutralization area are arranged on the water outlet side of the neutralization area. The Fenton reaction tank dosing system comprises a hydrogen peroxide dosing tank, a ferrous dosing tank, a sulfuric acid dosing tank, a second liquid caustic soda dosing tank, a second organic flocculant dosing tank, and a Fenton reagent dosing unit, a sulfuric acid dosing unit, a second liquid caustic soda dosing unit and a second organic flocculant dosing unit which are arranged in the corresponding dosing tanks.
A hydrogen peroxide dosing point 2111 and a stirring device are arranged in a hydrogen peroxide dosing pool 211 on one side of the oxidation area, a ferrous dosing point 2121 and a stirring device are arranged in a ferrous dosing pool 212, a Fenton reaction pool water inlet point 2131, a sulfuric acid dosing point 2132, a sulfuric acid dosing pool pH measuring point 2133 and a stirring device are arranged in a sulfuric acid dosing pool 213, an oxidation area pH measuring point 2134 is arranged in the oxidation area, and a throw-in type pH meter is arranged in the oxidation area pH measuring point.
The Fenton reagent dosing unit comprises a hydrogen peroxide dosing device 7 connected with a PLC respectively, a ferrous dosing device 8 and a monitoring device, the monitoring device comprises a water inlet electromagnetic flowmeter 20 connected with a water inlet pipe in a sulfuric acid dosing pool and a pH meter in an oxidation area, the hydrogen peroxide dosing device and the ferrous dosing device respectively comprise a medicine storage tank, a metering pump and a medicament electromagnetic flowmeter which are sequentially connected through a pipeline, a pipeline of the hydrogen peroxide dosing device is introduced into a hydrogen peroxide dosing point, a pipeline of the ferrous dosing device is introduced into a ferrous dosing point, hydrogen peroxide and ferrous are added into the hydrogen peroxide dosing pool and the ferrous dosing pool respectively, and a Fenton reagent is formed after mixing in the oxidation area.
The sulphuric acid adds the medicine unit and includes the sulphuric acid charge device 9 and the monitoring devices who is connected with PLC respectively, and monitoring devices is for setting up at sulphuric acid and adds the income formula pH meter 5 of medicine pond pH measuring point, and sulphuric acid charge device includes medicine storage tank, measuring pump and medicament electromagnetic flow meter through the tube coupling, and sulphuric acid charge device's pipeline lets in sulphuric acid and adds the medicine point, adds sulphuric acid with sulphuric acid and adds the medicine pond.
Be equipped with second liquid caustic soda in the second liquid caustic soda dosing pool 221 of neutralization area one side and add medicine point 2211, second liquid caustic soda dosing pool pH measuring point 2212 and agitating unit, second liquid caustic soda adds medicine unit and includes liquid caustic soda charge device 4 and the monitoring devices who is connected with PLC respectively, monitoring devices is for setting up the input pH meter at second liquid caustic soda dosing pool pH measuring point, liquid caustic soda charge device's pipeline lets in second liquid caustic soda dosing point, adds the second liquid caustic soda dosing pool with liquid caustic soda.
Be equipped with first organic flocculant dosing point 2221 and agitating unit in the second organic flocculant dosing tank 222, first organic flocculant adds the medicine unit including organic flocculant charge device 6 and the monitoring devices who is connected with PLC respectively, monitoring devices is the electromagnetic flowmeter of intaking 20 with the water piping connection in the sulphuric acid dosing tank, organic flocculant charge device's pipeline lets in second organic flocculant dosing point, add the second organic flocculant dosing tank with organic flocculant PAM, the switch of the screw pump in the second organic flocculant dosing unit and the switch of the metering pump in the second liquid caustic soda dosing unit pass through PLC and are correlated with.
Preferably, as shown in fig. 3, in the inorganic flocculant dosing device, the first and second liquid caustic soda dosing devices, the hydrogen peroxide dosing device, the ferrous dosing device and the sulfuric acid dosing device, control valves 13 are respectively arranged on pipelines at the outlet of the chemical storage tank 10 and in front of the metering pump 11, a y-type filter 14 is arranged between the two control valves, a safety valve 15, a damper 16 and a back pressure valve 17 which are sequentially connected are arranged between the back of the metering pump and the electromagnetic chemical flow meter 12, the safety valve is communicated with the chemical storage tank through a pipeline, and an automatic mode and a manual mode change-over switch are arranged on the metering pump.
As shown in fig. 4, in the first and second organic flocculant dosing devices, control valves 13 are respectively provided on the pipes before and after the pump of a screw pump 19 connected to the PAM automation drug machine 18 and the drug electromagnetic flow meter 12, and automatic and manual mode switching switches are provided on the screw pump.
The utility model provides an when automatic reagent feeding system moves, materialization sedimentation tank charge system passes through switching and the frequency of medicine pump in each medicine unit of PLC control, makes inorganic flocculant and organic flocculant reach best cooperation proportion to according to inorganic flocculant and organic flocculant's quantity of throwing of liquid caustic soda, make the pH in the materialization precipitation reach best flocculation condition, make the pollutant in the waste water can effectively coagulating sedimentation, improve the treatment effect of waste water. The PLC in the oxidation zone of the Fenton reaction tank calculates and controls the adding amount of the Fenton reagent according to the monitoring signal transmitted by the monitoring device in the dosing unit, and controls the pH value of the oxidation zone in the effective range of the Fenton reagent through the sulfuric acid dosing device, so that the Fenton reagent can effectively oxidize organic matters in the wastewater, and the treatment effect of the organic matters is improved; after wastewater oxidized by the Fenton reagent in the oxidation area enters the neutralization area, the pH value of the wastewater is adjusted to a range suitable for subsequent treatment through the liquid caustic soda dosing unit, and the organic flocculant is added through the second organic flocculant dosing unit, so that the oxidized pollutants are flocculated and precipitated, and the treatment effect is further improved.
Inorganic flocculating agent adds the medicine unit and passes through the electromagnetic flowmeter signal transmission inflow of intaking, and operating personnel sets up through the inflow and adds the medicine percentage, and PLC adds the medicine volume through the signal of intake flowmeter transmission, converts into inorganic flocculating agent, combines the signal of medicament electromagnetic flowmeter transmission, changes the measuring pump through the frequency conversion and carries the medicament volume, makes the inorganic flocculating agent carry and reach required volume.
In first and second liquid caustic soda adds medicine unit, operating personnel sets up out water pH interval in advance, combines the signal of pH meter feedback, and when pH is less than the interval lower limit, the measuring pump starts the operation, through pH meter feedback signal, variable frequency control adds the medicine volume size, and when play water pH was higher than the interval value, the measuring pump stop operation.
In the first organic flocculant dosing unit, an operator sets screw pump frequency in advance, a screw pump switch is associated with a metering pump switch in the inorganic flocculant dosing unit, and after the chemical agent pump in the inorganic flocculant dosing unit is started, the screw pump in the first organic flocculant dosing unit is automatically started according to the set frequency after a proper time.
In the Fenton reagent adds the medicine unit, when pH reaches reaction pH interval in the oxidation zone, the metering pump automatic start among ferrous charge device and the hydrogen peroxide solution charge device, operating personnel sets up two kinds of medicaments and adds the medicine ratio, through the signal that the electromagnetic flowmeter of intaking passed back, frequency conversion automatic control metering pump frequency makes the medicament dosing amount accord with the setting amount.
In the sulphuric acid adds the medicine unit, operating personnel sets up pH interval 2~4, and when pH was higher than 4 in the oxidation zone, the measuring pump automatic reagent that adds, and the signal that combines the pH meter to return passes through frequency conversion control and adds the dose, keeps going out water pH at 2~4 within ranges, ensures that the organic matter in the fenton's reagent can effectively oxidation waste water.
In the second organic flocculant dosing unit, an operator sets the frequency of a screw pump, the screw pump switch is associated with a metering pump switch in the second liquid alkali dosing device, and after a metering pump in the second liquid alkali dosing device is started, the screw pump is automatically started according to the set frequency after a proper time.
The utility model discloses a PLC automatic control reaches remote control charge system's purpose with traditional charge device cooperation, makes charge system can improve printing and dyeing wastewater treatment stability according to the operational aspect of production circumstances, automatic adjustment charge system, reduces the sewage treatment cost.
Claims (10)
1. An automatic dosing system used in a printing and dyeing wastewater treatment system comprises a physical and chemical precipitation tank and a Fenton reaction tank, and is characterized in that the automatic dosing system comprises a PLC (programmable logic controller), and a physical and chemical precipitation tank dosing system and a Fenton reaction tank dosing system which are respectively connected with the PLC, wherein the physical and chemical precipitation tank dosing system comprises an inorganic flocculant dosing tank, a first liquid alkali dosing tank, a first organic flocculant dosing tank, an inorganic flocculant dosing unit, a first liquid alkali dosing unit and a first organic flocculant dosing unit, which are mutually separated and respectively communicated with the physical and chemical precipitation tank; the Fenton reaction pond is including the oxidation zone and the neutralization zone that link to each other, Fenton reaction pond charge system is including separating each other and respectively with the Fenton reagent of oxidation zone intercommunication add medicine pond and sulphuric acid add medicine pond, separate each other and respectively with second liquid caustic soda of neutralization zone intercommunication add medicine pond and second organic flocculating agent add medicine pond to and the Fenton reagent that sets up in corresponding adding medicine pond adds medicine unit, sulphuric acid adds medicine unit, second liquid caustic soda adds medicine unit and second organic flocculating agent and adds the medicine unit, each adds medicine unit including charge device and the monitoring devices who is connected with PLC respectively, charge device is including the medicine storage tank, dosing pump and the medicament electromagnetic flow meter that loop through the pipe connection, charge pump and medicament electromagnetic flow meter are connected with PLC respectively.
2. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 1, wherein in the inorganic flocculant dosing unit, a dosing pump in the dosing device is a metering pump, and the monitoring device is an inlet electromagnetic flowmeter connected with an inlet pipe.
3. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 1, wherein in the first and second liquid caustic dosing units, the dosing pumps in the dosing devices are metering pumps, and the monitoring device is a pH meter.
4. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 1, wherein in the first and second organic flocculant dosing units, a PAM (polyacrylamide) automatic dosing machine is adopted as a medicine storage tank in the dosing device, and a dosing pump is a screw pump.
5. The automatic dosing system for the printing and dyeing wastewater treatment system according to claim 1, wherein the Fenton reagent dosing unit comprises a hydrogen peroxide dosing device, a ferrous iron dosing device and a monitoring device, the monitoring device comprises a water inlet electromagnetic flowmeter connected with a water inlet pipe and a pH meter arranged in an oxidation zone, and dosing pumps in the hydrogen peroxide dosing device and the ferrous iron dosing device are metering pumps.
6. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 1, wherein in the sulfuric acid dosing unit, a dosing pump in the dosing device is a metering pump, and the monitoring device is a pH meter.
7. The automatic dosing system for a printing and dyeing wastewater treatment system as claimed in claim 1, wherein a stirring device is provided in each dosing tank.
8. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 1, wherein the dosing pump is provided with an automatic and manual mode switch.
9. The automatic dosing system for the printing and dyeing wastewater treatment system as claimed in claim 4, wherein the pipelines before and after the screw pump are respectively provided with a control valve.
10. The automatic chemical feeding system for the printing and dyeing wastewater treatment system according to claim 2, 3, 5, 6 or 7, characterized in that control valves are respectively arranged on a pipeline at the outlet of the chemical storage tank and in front of the metering pump, a y-shaped filter is arranged between the two control valves, a safety valve, a damper and a back pressure valve which are sequentially connected are arranged between the rear of the metering pump and the chemical electromagnetic flowmeter, and the safety valve is communicated with the chemical storage tank through a pipeline.
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| CN201922130298.9U CN211664848U (en) | 2019-12-02 | 2019-12-02 | Automatic dosing system for printing and dyeing wastewater treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573741A (en) * | 2020-12-28 | 2021-03-30 | 中广核达胜加速器技术有限公司 | Chemical adding control system and method for treating printing and dyeing wastewater by using electron beams |
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2019
- 2019-12-02 CN CN201922130298.9U patent/CN211664848U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573741A (en) * | 2020-12-28 | 2021-03-30 | 中广核达胜加速器技术有限公司 | Chemical adding control system and method for treating printing and dyeing wastewater by using electron beams |
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