CN214936692U - High COD high salt high oil effluent disposal system - Google Patents
High COD high salt high oil effluent disposal system Download PDFInfo
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Abstract
The utility model relates to a high COD high salt high oil wastewater treatment system, include air supporting reaction tank, ultrasonic reactor, first filter, two iron electrode exchange pulse electric flocculation-Fenton reaction unit, second filter, reverse osmosis unit and the active carbon adsorption post that connects gradually through the pipeline. The utility model discloses a processing system adopts physics air flotation method and ultrasonic wave method, adopts two iron electrode to exchange pulse electric flocculation-Fenton method can the effective processing waste water in oil drip with dissolve in the organic matter of water, a large amount of chloride ions, sulfate ion, sodium ion etc. of reverse osmosis method effective processing aquatic, the active carbon adsorption column adsorbs remaining organic matter in the water once more to waste water. The computer and the PLC are used for monitoring the whole wastewater treatment process in real time, and the real-time COD, pH, oil degree and conductivity of the wastewater are mastered, so that the device system for treating the high-COD, high-salinity and high-oil wastewater achieves the intelligent purpose.
Description
Technical Field
The utility model relates to an industrial wastewater treatment technical field especially relates to a high oily effluent disposal system of high COD high salt.
Background
In the metallurgical industry, the hydrometallurgical technology is adopted to extract metal substances in raw materials, and in the back-extraction and raffinate stages, part of extractant and solvent oil are mixed into a water phase, so that in the actual industrial production, as the extractant and the diluent are hydrophilic and continuous extraction equipment cannot realize the thorough clarification and separation of oil and water, part of oil substances are inevitably carried in the metal raffinate and the metal-rich strip liquor. If the oil in the feed liquid is not removed, the purity and performance index of subsequent products can be seriously influenced, and the oil content and COD value of part of raffinate wastewater and strip liquor wastewater are very high and cannot reach the discharge standard.
At present, the traditional methods for treating organic matters comprise a chemical flocculation method, an electric flocculation method, a Fenton method and biological treatment. Chemical flocculation, adding strong base to increase the pH value of the wastewater to the precipitation value of heavy metal hydroxides, and then adding aluminum or iron salt to form colloidal substances (such as hydroxides) to adsorb and remove organic substances and heavy metals. Hydroxide precipitation produces a relatively low density sludge forming a large amount of suspension, which can lead to dewatering and disposal problems. In addition, when the complexing agent is present in the wastewater, the formation of metal hydroxide flocs is inhibited. The basic electroflocculation unit is usually composed of an electrolytic cell with anode and cathode metal electrodes externally connected to a DC power supply and immersed in the solution to be treated, iron and aluminum electrodes are the most extensive electroflocculation units for electroflocculation, and the anode iron electrode loses electrons to form ferric hydroxide colloid to adsorb organic substances for the purpose of removing oil content and COD. The Fenton method is characterized in that ferrous sulfate and hydrogen peroxide are mixed according to a certain proportion and added into wastewater, and ferrous ions and the hydrogen peroxide undergo a Fenton reaction to generate hydroxyl radicals (OH), so that organic matters can be effectively decomposed into carbon dioxide and inorganic matters, and the aim of removing COD is fulfilled. The biological treatment is the ability of biological absorption and degradation of pollutants to purify waste water, and decomposes organic substances by means of the decomposition action of microorganisms, thereby achieving the purpose of removing COD.
However, the above treatment method has the following drawbacks:
1. in both the chemical flocculation and the electroflocculation processes, some of the organic matter inhibits the formation of hydroxide colloids;
2. the biological treatment time period is long, and the research still needs to be deepened;
3. the single Fenton is not ideal for oil and COD removal;
4. the ferric hydroxide colloid produced by the electrocoagulation has limited adsorption capacity for a large amount of oil droplets in the wastewater.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a processing system of high COD high salt high oil waste water, solve and introduce the secondary pollutant problem, shorten processing cycle to reach the best effect of getting rid of.
In order to achieve the purpose, the utility model relates to a high COD high salt high oil wastewater treatment system, which comprises an air floatation reaction tank, an ultrasonic reactor, a first filter, a dual-iron electrode AC pulse electric flocculation-Fenton reaction device, a second filter, a reverse osmosis device and an active carbon adsorption column which are connected in sequence through pipelines;
the air floatation reaction tank is connected with the ultrasonic reactor through a rotary pump; a COD (chemical oxygen demand) tester is arranged on a pipeline connecting the air floatation reaction tank and the rotary pump;
at least 2 amplitude-change rods are arranged in the ultrasonic reactor and used as a source for sending out ultrasonic waves; a COD (chemical oxygen demand) tester is arranged on a pipeline connecting the ultrasonic reactor and the first filter;
at least 4 electrodes are arranged in the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device is of a single-pole parallel structure, all anode electrode plates are connected with each other and are connected with the anode of an external power supply, and all cathode electrode plates are connected with each other and are connected with the cathode of the external power supply;
a pH detector and a flow regulating valve are arranged on a pipeline connecting the first filter and the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device; a flow regulating valve is arranged on a pipeline connecting the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device and the second filter;
a COD (chemical oxygen demand) tester and an oil degree tester are arranged on a pipeline connecting the second filter and the reverse osmosis device; the second filter is connected with the filter press;
fresh water generated by low pressure in the reverse osmosis device is discharged to the activated carbon adsorption column through a pipeline, and strong brine generated by high pressure is discharged back to the ultrasonic reactor through a pipeline;
a conductivity tester is arranged on a pipeline connecting the activated carbon adsorption column and the reverse osmosis device;
the PLC is connected with the COD tester, the pH detector, the oil degree tester and the conductivity tester; the PLC is connected with a bubbling device of the air floatation reaction tank, an amplitude transformer of the ultrasonic reactor and a power supply in the dual-iron electrode alternating current pulse electric flocculation-Fenton device.
Preferably, the air flotation reaction tank uses a vortex pump as a bubbling device of the wastewater, and simultaneously the pH is controlled to be 2-3; the diameter of the generated bubbles can reach 20mm-30mm, and the smaller the diameter of the bubbles is, the more the bubbles are, the easier the oil drops in the adsorbed wastewater float to the surface of the wastewater, and the removal is convenient.
Preferably, the ultrasonic reactor uses a horn made of titanium alloy to generate ultrasonic waves, and the horn emits ultrasonic waves with the frequency of 2 MHz; the output frequency is better than the ultrasonic wave generated by the reactor body of the reactor, and the noise decibel generated by the amplitude transformer is also much lower.
Preferably, the dual-iron electrode alternating current pulse electroflocculation-Fenton reactor uses a stirring paddle in the wastewater treatment process to increase the contact adsorption probability of flocs with organic matters and oil drops.
The working principle of the utility model is as follows:
discharging wastewater into an air flotation reaction tank, controlling the initial pH to be 2-3, pumping a large number of micro bubbles with the diameter of 20-30 mm by a vortex pump, controlling the pH to be 2-3, adsorbing suspended oil and dispersed oil in water by the bubbles to float to the surface of the wastewater, then using an inclined plate to remove oil to scrape the oil on the upper layer of the wastewater, monitoring COD by an online COD (chemical oxygen demand) instrument, pumping the lower layer wastewater of the air flotation reaction tank into an ultrasonic reactor by a rotary pump after half an hour of treatment, sending ultrasonic waves with the frequency of 2MHz by an amplitude transformer in the ultrasonic reactor, discharging the wastewater into a first filter after half an hour of treatment, controlling the flow rate of the wastewater by a flow regulating valve, filtering partial oil stains and suspended matters generated by the air flotation reaction tank and the ultrasonic reactor, discharging the filtered wastewater into a dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, applying a proper current density, adding hydrogen peroxide in a certain proportion, stirring for half an hour, discharging into a second filter, separating flocculate and precipitate from the treated wastewater, allowing the flocculate and precipitate to enter a filter press, and performing hazardous waste treatment or preparing ferroferric oxide by a pyrogenic process after the flocculate and precipitate are treated by the filter press; the waste water is discharged into a reverse osmosis device, strong brine is discharged back into the ultrasonic reactor through a pipeline, and fresh water is introduced into an activated carbon adsorption column for purification.
The ultrasonic reactor receives the wastewater from the air flotation reaction tank, hydrogen peroxide is added, and through ultrasonic cavitation generated by the amplitude transformer, high temperature and high pressure are generated in a local area where ultrasonic waves occur, so that the hydrogen peroxide is rapidly decomposed into hydroxyl groups (. OH), and the decomposition of organic matters in the wastewater is accelerated.
Wherein the dual-iron electrode in the dual-iron electrode AC pulse electrocoagulation-Fenton reaction device is produced at the anode under the passing of currentGreen ferrous ion (Fe)2+)，Fe2+The organic matter and oil drops in the wastewater and a small amount of heavy metal ions in the wastewater can be effectively adsorbed, and the aim of effectively removing COD and oil content can be fulfilled by the synergistic effect of the organic matter and the oil drops; in addition, oily sewage can be treated by generating metal hydroxides through electrolysis of a proper anode material and generating less sludge, wherein current can promote the electrocoagulation of oil drops, and in the treatment process, chloride ions in the wastewater can be partially electrolyzed to generate chlorine and oxidize organic matters. The dual-iron electrode can be effectively utilized by adopting an alternating current pulse current mode, and the maximum utilization rate is realized; the inner body of the reaction device needs to be cleaned regularly, and the iron plate electrode needs to be replaced regularly.
The reverse osmosis device utilizes reverse osmosis pressure to enable salt in the wastewater to be concentrated to one side of a reverse osmosis membrane and discharged back to the ultrasonic reactor through an outlet, and meanwhile, the conductivity of the wastewater is increased, so that a relatively low current density can be applied to the dual-iron electrode alternating current pulse electroflocculation-Fenton reactor; COD value is little in the waste water after the second filter filters, and the oiliness is low, and the salinity is high, through reverse osmosis unit, returns the strong brine to arrange to the system in, and during low salt solution let in the active carbon adsorption column, remaining organic matter in the waste water, suspended solid can adsorb on the active carbon surface to reach the best effect of getting rid of.
The utility model discloses use computer and PLC controller to carry out real time monitoring to the processing overall process of waste water, master the real-time COD and pH, oily degree, the conductivity of waste water. The requirement of automatic processing is met by editing corresponding programs through a computer and a PLC (programmable logic controller), and workers can discharge different waste water, so that corresponding power supply information is input to the PLC, the PLC is used for controlling the number of bubbles in an air floatation reaction tank, the vibration frequency of an ultrasonic reactor and the hydrogen peroxide addition and current density of the dual-iron electrode alternating current pulse electrocoagulation-Fenton are correspondingly changed, accurate control of the waste water is achieved, the waste water information received by the PLC is transmitted into the computer, and the purpose of intellectualization of a device system for treating the high-COD, high-salinity and high-oil waste water is achieved.
Advantageous effects
The utility model discloses a processing system adopts physics air flotation method and ultrasonic wave method, adopts two iron electrode to exchange pulse electric flocculation-Fenton method can the effective processing waste water in oil drip with dissolve in the organic matter of water, a large amount of chloride ions, sulfate ion, sodium ion etc. of reverse osmosis method effective processing aquatic, the active carbon adsorption column adsorbs remaining organic matter in the water once more to waste water. Has the following beneficial effects:
1. in the whole wastewater treatment system, hydrogen peroxide is decomposed by ultrasonic waves in an ultrasonic reactor to generate hydroxyl groups with strong oxidation groups, and in a dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, Fenton reaction is performed to generate hydroxyl groups, wherein the hydroxyl groups belong to green strong oxidation groups and can effectively decompose organic matters.
2. The time period for treating the wastewater is short, and the method is suitable for treating the acidic wastewater.
3. The reverse osmosis equipment discharges the strong brine to the ultrasonic reactor, so that the conductivity of the wastewater is increased, the applied current density of the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device is reduced, the energy consumption is saved, and the utilization rate of the iron electrode is increased in an alternating current pulse current mode.
4. After the wastewater is treated by the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, the pH value of the wastewater is changed from the initial pH value of 2 to the pH value of 6, and acid and alkali are not required to be added to adjust the pH value of the wastewater.
5. In the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, compared with a chemical flocculation method, a coagulant generates metal hydroxide through electrolysis of a proper anode material and generates less sludge, so that oily sewage can be treated, wherein the existence of current can promote the electrocoagulation of oil drops, and the electrocoagulation is adsorbed on the surface of the floc and is removed through sedimentation.
6. The initial COD of the wastewater is 5g/L, the oil content is 300ppm, the sodium ion content is 12g/L, after the wastewater passes through the whole treatment system, the COD removal rate reaches 92%, the oil removal rate reaches 91%, the desalination rate reaches 95%, the COD of the treated wastewater is less than or equal to 500mg/L, the pH value is 6-8, and the national third-level standard for discharging sewage is reached.
7. Automatic feeding, real-time monitoring of experimental data, computer display and intelligent production are realized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objects of the present invention, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Example 1
A high COD high salt high oil wastewater treatment system comprises an air floatation reaction tank 1, an ultrasonic reactor 2, a first filter 3, a dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device 4, a second filter 5, a reverse osmosis device 6 and an activated carbon adsorption column 7 which are sequentially connected through a pipeline;
the air floatation reaction tank is connected with the ultrasonic reactor through a rotary pump 8; a COD (chemical oxygen demand) tester 9 is arranged on a pipeline connecting the air floatation reaction tank and the rotary pump;
at least 2 amplitude transformer 10 are arranged in the ultrasonic reactor as the source of ultrasonic emission; a COD (chemical oxygen demand) tester 11 is arranged on a pipeline connecting the ultrasonic reactor and the first filter;
at least 4 electrodes 12 are arranged in the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device and are in a single-pole parallel structure, all anode electrode plates are connected with each other and are connected with the anode of an external power supply 13, and all cathode electrode plates are connected with each other and are connected with the cathode of the external power supply;
a pH detector 14 and a flow regulating valve 15 are arranged on a pipeline connecting the first filter and the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device; a flow regulating valve 16 is arranged on a pipeline connecting the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device and the second filter;
a COD tester 17 and an oil degree tester 18 are arranged on a pipeline connecting the second filter and the reverse osmosis device; the second filter is connected with a filter press 19;
fresh water generated by low pressure in the reverse osmosis device is discharged to the activated carbon adsorption column through a pipeline, and strong brine generated by high pressure is discharged back to the ultrasonic reactor through a pipeline;
a conductivity tester 20 is arranged on a pipeline connecting the activated carbon adsorption column and the reverse osmosis device;
the PLC 21 is connected with a COD tester, a pH detector, an oil degree tester and a conductivity tester; the PLC is connected with a bubbling device of the air floatation reaction tank, an amplitude transformer of the ultrasonic reactor and a power supply in the dual-iron electrode alternating current pulse electric flocculation-Fenton device.
Wherein, the air floatation reaction tank uses a vortex pump as a bubbling device of the wastewater, and simultaneously, the pH is controlled to be 2-3.
Wherein, the ultrasonic reactor uses a variable amplitude rod made of titanium alloy to generate ultrasonic waves, and the variable amplitude rod emits the ultrasonic waves with the frequency of 2 MHz.
Wherein, the stirring paddle 22 is used in the process of treating wastewater by the dual-iron electrode AC pulse electroflocculation-Fenton reactor.
The working principle of the utility model is as follows:
discharging wastewater into an air flotation reaction tank 1, controlling the initial pH to be 2-3, pumping a large number of micro bubbles with the diameter of 20-30 mm by a vortex pump, controlling the pH to be 2-3, floating suspended oil and dispersed oil in water to the surface of the wastewater by bubble adsorption, then scraping the oil on the upper layer of the wastewater by using an inclined plate for oil removal, monitoring COD 9 by an online COD (chemical oxygen demand) instrument, pumping the lower layer wastewater in the air flotation reaction tank out by a rotary pump 8 after half an hour of treatment, discharging into an ultrasonic reactor 2, sending ultrasonic waves with the frequency of 2MHz by an amplitude transformer 10 in the ultrasonic reactor, discharging into a first filter 3 after half an hour of treatment, controlling the flow rate of the wastewater by a flow regulating valve 15, filtering out partial oil stains and suspended matters generated by the air flotation reaction tank and the ultrasonic reactor, discharging the filtered wastewater into a dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device 4, applying a proper current density, adding hydrogen peroxide in a certain proportion, stirring for half an hour, discharging into a second filter 5, separating flocculate and precipitate from the treated wastewater, allowing the flocculate and precipitate to enter a filter press 19, and performing hazardous waste treatment or preparing ferroferric oxide by a pyrogenic process after the treatment by the filter press; the waste water is discharged into a reverse osmosis device 6, strong brine is discharged back into the ultrasonic reactor through a pipeline, and fresh water is introduced into an activated carbon adsorption column 7 for purification.
The ultrasonic reactor receives the wastewater from the air flotation reaction tank, hydrogen peroxide is added, and through ultrasonic cavitation generated by the amplitude transformer, high temperature and high pressure are generated in a local area where ultrasonic waves occur, so that the hydrogen peroxide is rapidly decomposed into hydroxyl groups (. OH), and the decomposition of organic matters in the wastewater is accelerated.
Wherein the anode of the dual-iron electrode in the dual-iron electrode AC pulse electric flocculation-Fenton reaction device generates ferrous ions (Fe) when current passes through the dual-iron electrode2+)，Fe2+The organic matter and oil drops in the wastewater and a small amount of heavy metal ions in the wastewater can be effectively adsorbed, and the aim of effectively removing COD and oil content can be fulfilled by the synergistic effect of the organic matter and the oil drops; in addition, oily sewage can be treated by generating metal hydroxides through electrolysis of a proper anode material and generating less sludge, wherein current can promote the electrocoagulation of oil drops, and in the treatment process, chloride ions in the wastewater can be partially electrolyzed to generate chlorine and oxidize organic matters. The dual-iron electrode can be effectively utilized by adopting an alternating current pulse current mode, and the maximum utilization rate is realized; the inner body of the reaction device needs to be cleaned regularly, and the iron plate electrode needs to be replaced regularly.
The reverse osmosis device utilizes reverse osmosis pressure to enable salt in the wastewater to be concentrated to one side of a reverse osmosis membrane and discharged back to the ultrasonic reactor through an outlet, and meanwhile, the conductivity of the wastewater is increased, so that a relatively low current density can be applied to the dual-iron electrode alternating current pulse electroflocculation-Fenton reactor; COD value is little in the waste water after the second filter filters, and the oiliness is low, and the salinity is high, through reverse osmosis unit, returns the strong brine to arrange to the system in, and during low salt solution let in the active carbon adsorption column, remaining organic matter in the waste water, suspended solid can adsorb on the active carbon surface to reach the best effect of getting rid of.
The utility model discloses use computer and PLC controller to carry out real time monitoring to the processing overall process of waste water, master the real-time COD and pH, oily degree, the conductivity of waste water. The requirement of automatic processing is met by editing corresponding programs through a computer and a PLC (programmable logic controller), and workers can discharge different waste water, so that corresponding power supply information is input to the PLC, the PLC is used for controlling the number of bubbles in an air floatation reaction tank, the vibration frequency of an ultrasonic reactor and the hydrogen peroxide addition and current density of the dual-iron electrode alternating current pulse electrocoagulation-Fenton are correspondingly changed, accurate control of the waste water is achieved, the waste water information received by the PLC is transmitted into the computer, and the purpose of intellectualization of a device system for treating the high-COD, high-salinity and high-oil waste water is achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, it is not intended to limit the present invention, and any person skilled in the art can make some changes or modifications to equivalent embodiments using the above disclosed technical content without departing from the scope of the present invention, but all the simple modifications, equivalent changes and modifications made to the above embodiments by the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (4)
1. The utility model provides a high COD high salt high oil effluent disposal system which characterized in that: comprises an air floatation reaction tank, an ultrasonic reactor, a first filter, a dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, a second filter, a reverse osmosis device and an activated carbon adsorption column which are connected in sequence through pipelines;
the air floatation reaction tank is connected with the ultrasonic reactor through a rotary pump; a COD (chemical oxygen demand) tester is arranged on a pipeline connecting the air floatation reaction tank and the rotary pump;
at least 2 amplitude-change rods are arranged in the ultrasonic reactor and used as a source for sending out ultrasonic waves; a COD (chemical oxygen demand) tester is arranged on a pipeline connecting the ultrasonic reactor and the first filter;
at least 4 electrodes are arranged in the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device, the dual-iron electrode alternating current pulse electrocoagulation-Fenton reaction device is of a single-pole parallel structure, all anode electrode plates are connected with each other and are connected with the anode of an external power supply, and all cathode electrode plates are connected with each other and are connected with the cathode of the external power supply;
a pH detector and a flow regulating valve are arranged on a pipeline connecting the first filter and the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device; a flow regulating valve is arranged on a pipeline connecting the dual-iron electrode alternating current pulse electric flocculation-Fenton reaction device and the second filter;
a COD (chemical oxygen demand) tester and an oil degree tester are arranged on a pipeline connecting the second filter and the reverse osmosis device; the second filter is connected with the filter press;
fresh water generated by low pressure in the reverse osmosis device is discharged to the activated carbon adsorption column through a pipeline, and strong brine generated by high pressure is discharged back to the ultrasonic reactor through a pipeline;
a conductivity tester is arranged on a pipeline connecting the activated carbon adsorption column and the reverse osmosis device;
the PLC is connected with the COD tester, the pH detector, the oil degree tester and the conductivity tester; the PLC is connected with a bubbling device of the air floatation reaction tank, an amplitude transformer of the ultrasonic reactor and a power supply in the dual-iron electrode alternating current pulse electric flocculation-Fenton device.
2. The high COD high salt high oil wastewater treatment system according to claim 1, characterized in that: the air-float reaction tank uses a vortex pump as a bubbling device of the waste water, and simultaneously the pH is controlled to be 2-3.
3. The high COD high salt high oil wastewater treatment system according to claim 1, characterized in that: the ultrasonic reactor uses a horn made of titanium alloy to generate ultrasonic waves, and the horn emits ultrasonic waves with the frequency of 2 MHz.
4. The high COD high salt high oil wastewater treatment system according to claim 1, characterized in that: the dual-iron electrode alternating current pulse electrocoagulation-Fenton reactor uses a stirring paddle in the wastewater treatment process.
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