CN112875970A - Ultrasonic alternating current flocculation phosphorus removal device and method - Google Patents
Ultrasonic alternating current flocculation phosphorus removal device and method Download PDFInfo
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- 238000005189 flocculation Methods 0.000 title claims abstract description 68
- 230000016615 flocculation Effects 0.000 title claims abstract description 68
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 46
- 239000011574 phosphorus Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 62
- 239000002351 wastewater Substances 0.000 claims abstract description 59
- 238000009297 electrocoagulation Methods 0.000 claims abstract description 13
- 239000000523 sample Substances 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 10
- 230000010287 polarization Effects 0.000 abstract description 8
- 230000003311 flocculating effect Effects 0.000 abstract description 6
- 239000007791 liquid phase Substances 0.000 abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 3
- 238000010168 coupling process Methods 0.000 abstract description 3
- 238000005859 coupling reaction Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 230000000694 effects Effects 0.000 description 14
- 239000003344 environmental pollutant Substances 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
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- 239000010865 sewage Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
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- 229910021645 metal ion Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000000909 electrodialysis Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000012851 eutrophication Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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Abstract
The invention discloses an ultrasonic alternating current flocculation dephosphorization device and method. The ultrasonic alternating current flocculation phosphorus removal device comprises an electric flocculation reaction tank, wherein a plurality of first polar plates and second polar plates which are parallel to each other are alternately arranged inside the electric flocculation reaction tank from left to right, and the first polar plates and the second polar plates are respectively connected with two polar plates of a pulse alternating current power supply; and an ultrasonic probe of the ultrasonic generator is inserted into the electrocoagulation reaction tank. The invention adopts alternating current pulse electric signals, can effectively avoid polarization of polar plates, can generate flocculating substances on each polar plate, fully contacts wastewater with each polar plate and the generated flocculating substances through high and low polar plates, and simultaneously homogenizes liquid phase by coupling an ultrasonic technology and avoids polarization of the polar plates.
Description
Technical Field
The invention belongs to the technical field of phosphorus-containing wastewater treatment, and particularly relates to an ultrasonic alternating current flocculation phosphorus removal device and method.
Background
With the increasing development and utilization activities of human beings on environmental resources, a large amount of domestic sewage and industrial wastewater containing phosphorus nutrients are discharged into rivers and lakes to increase the phosphorus load of a water body, so that the water body is eutrophicated. According to statistics, the eutrophication caused by phosphorus pollution of main lakes in China accounts for more than 50% of the lakes. The phosphorus in the eutrophic water body mainly comprises phosphorus which enters the water body from the outside and phosphorus which enters the water body and is released by sediments such as bottom mud and the like in the water body. Research shows that more than 80% of phosphorus in lakes and reservoirs is from sewage discharge. The phosphorus in sewage is mainly derived from excrement and washing products, and the pollution intensity of the phosphorus in sewage accounts for more than 50% of the total pollution load.
Commonly used phosphorus removal processes are biological and chemical. The biological phosphorus removal mainly utilizes the characteristics of anaerobic phosphorus release and aerobic phosphorus absorption of phosphorus-accumulating bacteria to remove phosphorus from sewage. However, the secondary treatment dephosphorization effect of the conventional sewage treatment plant is limited, and the simultaneous carbon removal and denitrification dephosphorization are difficult to be realized, and even if the biologically enhanced dephosphorization process is adopted, the carbon source competition exists in the denitrification dephosphorization itself, so that the optimal effects of the two are difficult to be simultaneously achieved. The phosphorus removal effect of the anaerobic-contact oxidation process is more obvious under the influence of low temperature in winter than the processes such as A2O, and the like, so that the deep phosphorus removal process is more important to be assisted. Although a plurality of new phosphorus removal processes such as adsorption phosphorus removal, chemical flocculation phosphorus removal, electrodialysis phosphorus removal, constructed wetland, electric flocculation phosphorus removal and the like also appear in recent years. The chemical flocculation method can cause the pH value of the wastewater to rise, a large amount of sludge is generated, the electrodialysis can only concentrate phosphorus together and cannot fundamentally remove phosphorus, and the adsorption method is rarely used for removing phosphorus in actual life due to the regeneration problem of the adsorption method. Electroflocculation is often used in sewage dephosphorization, but electroflocculation also has several disadvantages: the surface of the polar plate is easy to passivate, so that the dephosphorization efficiency is influenced; the generated floc quickly settles to the bottom of the tank, and the phosphorus is not completely captured; the iron polar plate is easy to generate ferrous ions, and the ferrous ions react with color substances in water to generate organic iron compounds which are difficult to flocculate and settle, so that the water body is discolored.
Disclosure of Invention
The invention mainly aims to provide an ultrasonic alternating current flocculation dephosphorization device and method. The invention adopts alternating current pulse electric signals, can effectively avoid polarization of polar plates, can generate flocculating substances on each polar plate, fully contacts wastewater with each polar plate and the generated flocculating substances through high and low polar plates, and simultaneously homogenizes liquid phase by coupling an ultrasonic technology and avoids polarization of the polar plates.
In order to solve the technical problems, the invention adopts the following technical scheme:
an ultrasonic alternating current flocculation phosphorus removal device comprises:
the electrolytic flocculation reaction tank is internally provided with a plurality of first polar plates and second polar plates which are parallel to each other from left to right in an alternating mode, and the first polar plates and the second polar plates are respectively connected with two electrodes of a pulse alternating current power supply;
and an ultrasonic probe of the ultrasonic generator is inserted into the electrocoagulation reaction tank.
Specifically, the first polar plate and the second polar plate are arranged in a vertically staggered manner to form a return reaction flow channel for wastewater to flow.
The device comprises a turning-back reaction flow channel, a pH adjusting tank and a water tank, wherein the turning-back reaction flow channel is communicated with the inlet end of the turning-back reaction flow channel through a pipeline.
Specifically, a water inlet pump is arranged on the pipeline.
Specifically, the first polar plate and the second polar plate are both made of soluble iron plates.
An ultrasonic alternating current flocculation dephosphorization method comprises the following steps:
step 1, adjusting the pH value of the wastewater by acid or alkali;
the electric flocculation reaction tank is internally provided with a first polar plate and a second polar plate in parallel from left to right alternately, the first polar plate and the second polar plate are staggered up and down to form a turn-back reaction flow channel, and wastewater is folded and flows through the turn-back reaction flow channel;
and 3, allowing the treated wastewater to flow out of the electric flocculation reaction tank, standing the discharged water, and discharging supernatant.
Specifically, the power supply of the electric flocculation reaction tank is a pulse alternating current power supply, the output voltage of the electric flocculation reaction tank is 0-40V, the output frequency of the electric flocculation reaction tank is 50Hz-1000Hz, and the output current density of the electric flocculation reaction tank is 0.25A/dm2～4.0A/dm2The frequency of the ultrasonic wave is 10-50 KHz.
Specifically, the distance between the adjacent first polar plate and the second polar plate is controlled to be 1-5 cm.
Specifically, the pH value of the wastewater is adjusted to 3-10 by acid or alkali.
Principles and advantages
The inventor skillfully changes the power supply of the flocculation reaction into an alternating current pulse power supply, and sets the first polar plate and the second polar plate as polar plates which can be corroded, the first polar plate and the second polar plate in the electric flocculation reaction tank are alternately changed into soluble anodes (sacrificial anodes), the reaction time on the polar plates is intermittent, which is beneficial to dispersion and reduction of concentration polarization, thereby reducing energy consumption. In addition, when the alternating current pulse signal with the periodically reversed direction is applied, the method has the characteristic of pulse electrolysis, because the two electrodes are soluble, the two electrodes can generate metal ions, the method is more favorable for adsorbing pollutants in wastewater by colloid formed by the polar plate, and because the polarity is changed frequently, the method plays a positive role in preventing the polar plate from being passivated.
In addition, the inventor staggers the setting from top to bottom with first polar plate and second polar plate, thereby form the reaction runner of turning back that makes a round trip to turn back from top to bottom between the two, make waste water be folding the flow in the electric flocculation reaction tank, the short current of waste water has been avoided, make the pollutant in the waste water have more contact opportunities with the high concentration flocculating agent of electrolysis polar plate department, and owing to adopt alternating current pulse signal, every polar plate can all produce the material that has the flocculation ability, it is all positive with every polar plate contact to compare waste water with the direct current, the treatment effect of pollutant in the waste water has been strengthened.
Secondly, this application has coupled the low frequency ultrasonic wave technique, can produce a large amount of bubbles when super utilization sound wave acts on liquid for the more even that whole liquid phase can mix, the pollutant in the waste water has better contact with the flocculating agent that produces. In addition, the inventor researches and discovers that the introduced ultrasonic waves can locally apply pressure to the polar plate, so that the passivation layer on the surface of the polar plate can be damaged, and the treatment effect of pollutants in the wastewater can be enhanced.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts alternating current pulse electrical signals, can effectively avoid electrode polarization and can generate flocculating substances on each polar plate, fully contacts the wastewater with each polar plate and the generated flocculating substances through the high and low polar plates, simultaneously homogenizes the liquid phase and avoids polar plate polarization by coupling an ultrasonic technology, and when the device is applied to the treatment of the phosphorus-containing wastewater, the device has simple required equipment and lower cost and has great market potential.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an ultrasonic AC flocculation dephosphorization apparatus provided by an embodiment of the invention;
wherein: 1. a pH adjusting tank; 2. a water inlet pump; 3. an electric flocculation reaction tank; 4. a first electrode plate; 5. a second polar plate; 6. an ultrasonic probe; 7. a pulsed alternating current power supply; 8. an ultrasonic generator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an ultrasonic alternating current flocculation phosphorus removal device comprises an electrocoagulation reaction tank 3 and an ultrasonic generator 8, wherein a plurality of first polar plates 4 and second polar plates 5 which are parallel to each other are alternately arranged inside the electrocoagulation reaction tank 3 from left to right, the first polar plates 4 and the second polar plates 5 are arranged in a vertically staggered manner to form a back-turning reaction flow channel for wastewater to flow, the first polar plates 4 and the second polar plates 5 are respectively connected with two electrodes of a pulse alternating current power supply 7, and an ultrasonic probe 6 of the ultrasonic generator 8 is inserted into the bottom of the electrocoagulation reaction tank 3.
In the embodiment, wastewater enters the electrocoagulation reaction tank 3 after pH is adjusted, the device electrolyzes wastewater under a certain alternating voltage by adopting alternate soluble polar plates (sacrificial anodes), the polar plates are arranged in a baffle plate type, the polar plates which are alternately distributed can generate metal ions of colloid, the generated colloid adsorbs the heavy metal ions and organic matters in the wastewater to form a co-floc, gases such as H2, O2 and the like which can be generated by the two poles enable the system to be homogeneous, and low-frequency ultrasonic waves are matched to enhance liquid phase mass transfer, so that the electrodes depolarize and are cleaned.
Specifically, the device still includes pH equalizing basin 1, and pH equalizing basin 1 is equipped with intake pump 2 through pipeline and the entrance point intercommunication of the reaction runner of turning back, and in practical application, first polar plate 4 and second polar plate 5 all adopt soluble iron plate.
In the embodiment, the inventor skillfully changes the power supply of the flocculation reaction into an alternating current pulse power supply, and sets the first polar plate and the second polar plate as polar plates which can be corroded, the first polar plate and the second polar plate in the electric flocculation reaction tank are alternately changed into soluble anodes (sacrificial anodes), the reaction time on the polar plates is intermittent, and the electric flocculation reaction tank is favorable for dispersing and reducing concentration polarization, thereby reducing energy consumption. In addition, when the alternating current pulse signal with the periodically reversed direction is applied, the method has the characteristic of pulse electrolysis, because the two electrodes are soluble, the two electrodes can generate metal ions, the method is more favorable for adsorbing pollutants in wastewater by colloid formed by the polar plate, and because the polarity is changed frequently, the method plays a positive role in preventing the polar plate from being passivated.
In addition, the inventor staggers the setting from top to bottom with first polar plate and second polar plate, thereby form the reaction runner of turning back that makes a round trip to turn back from top to bottom between the two, make waste water be folding the flow in the electric flocculation reaction tank, the short current of waste water has been avoided, make the pollutant in the waste water have more contact opportunities with the high concentration flocculating agent of electrolysis polar plate department, and owing to adopt alternating current pulse signal, every polar plate can all produce the material that has the flocculation ability, it is all positive with every polar plate contact to compare waste water with the direct current, the treatment effect of pollutant in the waste water has been strengthened.
Secondly, this application has coupled the low frequency ultrasonic wave technique, can produce a large amount of bubbles when super utilization sound wave acts on liquid for the more even that whole liquid phase can mix, the pollutant in the waste water has better contact with the flocculating agent that produces. In addition, the inventor researches and discovers that the introduced ultrasonic waves can locally apply pressure to the polar plate, so that the passivation layer on the surface of the polar plate can be damaged, and the treatment effect of pollutants in the wastewater can be enhanced.
The reason why the ultrasonic wave can generate bubbles is mainly as follows: firstly, the local tensile stress appears in the liquid to form negative pressure, and the reduction of the pressure leads the gas originally dissolved in the liquid to be supersaturated and then to escape from the liquid to become small bubbles. Another reason is that strong tensile stresses "tear" the liquid into a void, known as cavitation. The cavity is filled with a liquid vapor or another gas dissolved in the liquid, and may even be a vacuum. The small bubbles formed by cavitation will move, grow or suddenly disappear with the vibration of the surrounding medium.
An ultrasonic alternating current flocculation dephosphorization method comprises the following steps:
step 1, adjusting the pH value of the wastewater by acid or alkali;
2, pumping the wastewater with the pH value adjusted into an electric flocculation reaction tank 3 through a pump, and simultaneously carrying out alternating current flocculation under the low-frequency ultrasonic condition;
the electrolytic flocculation reaction tank 3 is internally provided with a first polar plate 4 and a second polar plate 5 alternately in parallel from left to right, the first polar plate 4 and the second polar plate 5 are arranged in a vertically staggered manner to form a turn-back reaction flow channel, and wastewater is folded and flows through the turn-back reaction flow channel;
and 3, discharging the treated wastewater from the electric flocculation reaction tank 3, and discharging supernatant after the effluent is stood.
The distance between the polar plates is 1-5cm, and the preferable distance is 1-3 cm.
Specifically, the power supply in the electric flocculation reaction tank 3 is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 0-40V, the duty ratio is 10% -90%, the output frequency is 50Hz-1000Hz, and the output current density is 0.25A/dm2-4.0A/dm2。
Preferably, the output voltage is 15-35V, the duty ratio is 20% -80%, the output frequency is 100Hz-800Hz, and the output current density is 1.0A/dm2-3.5A/dm2。
The ultrasonic frequency is 10-50KHz, preferably 20-40KHz, and the pH of the wastewater is first adjusted to 3-10, preferably 4-8, by hydrochloric acid or sodium hydroxide.
Example 1
In the embodiment, the method for treating the phosphorus-containing wastewater by ultrasonic alternating current flocculation adopts sodium hydroxide to adjust the pH of the simulated wastewater to 8, polar plates in an electrocoagulation reaction tank are soluble iron plates which are connected in parallel, the polar plates are arranged in a baffle plate manner, and the distance between the polar plates is 1 cm. The power supply in the electric flocculation reaction tank is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 35V, the duty ratio is 80 percent, the output frequency is 1000Hz, and the output current density is 2.5A/dm2. The ultrasonic frequency is 30 KHz. The results of the treatment are shown in Table 1.
TABLE 1 treatment Effect of phosphorus-containing wastewater at different residence times
| At the time of residenceInter index | TP before treatment (mg/L) | TP (mg/L) after treatment | Removal Rate (%) |
| 30min | 10 | 4.8 | 52 |
| 60min | 10 | 0.9 | 91 |
Example 2
In the embodiment, the method for treating the phosphorus-containing wastewater by ultrasonic alternating current flocculation adopts sodium hydroxide to adjust the pH of the simulated wastewater to 8, polar plates in an electrocoagulation reaction tank are soluble iron plates which are connected in parallel, the polar plates are arranged in a baffle plate manner, and the distance between the polar plates is 3 cm. The power supply in the electric flocculation reaction tank is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 35V, the duty ratio is 80 percent, the output frequency is 1000Hz, and the output current density is 2.5A/dm2. The ultrasonic frequency is 30 KHz. The results of the treatment are shown in Table 2.
TABLE 2 treatment Effect of phosphorus-containing wastewater at different residence times
| Index of residence time | TP before treatment (mg/L) | TP (mg/L) after treatment | Removal Rate (%) |
| 30min | 10 | 5.4 | 46 |
| 60min | 10 | 1.4 | 86 |
Example 3
In the embodiment, the method for treating the phosphorus-containing wastewater by ultrasonic alternating current flocculation adopts sodium hydroxide to adjust the pH of the simulated wastewater to 8, polar plates in an electrocoagulation reaction tank are soluble iron plates which are connected in parallel, the polar plates are arranged in a baffle plate manner, and the distance between the polar plates is 1 cm. The power supply in the electric flocculation reaction tank is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 25V, the duty ratio is 80 percent, the output frequency is 1000Hz, and the output current density is 2.0A/dm2. The ultrasonic frequency is 30 KHz. The results of the treatment are shown in Table 3.
TABLE 3 treatment Effect of phosphorus-containing wastewater at different residence times
Example 4
In this example, the ultrasonic AC flocculation of the phosphorus-containing wastewaterThe method adopts the steps that the pH value of the simulated wastewater is adjusted to 8 by using sodium hydroxide, polar plates in an electric flocculation reaction tank are soluble iron plates which are connected in parallel, the polar plates are arranged in a baffle plate type, and the distance between the polar plates is 1 cm. The power supply in the electric flocculation reaction tank is a direct current power supply, and the output current density is 2.5A/dm2. The ultrasonic frequency is 30 KHz. The results of the treatment are shown in Table 4.
TABLE 4 treatment Effect of phosphorus-containing wastewater at different residence times
| Index of residence time | TP before treatment (mg/L) | TP (mg/L) after treatment | Removal Rate (%) |
| 30min | 10 | 4.5 | 55 |
| 60min | 10 | 3.8 | 72 |
Comparative example 1
Different from the example 1, in the comparative example, the method for treating the phosphorus-containing wastewater by the ultrasonic alternating current flocculation adopts sodium hydroxide to adjust the pH value of the simulated wastewater to 8, and the polar plates in the electrocoagulation reaction tank are soluble iron plates which are connected in parallel and are formed by adopting the polar platesThe baffle plates are arranged in a baffle plate type, and the distance between the polar plates is 3 cm. The power supply in the electric flocculation reaction tank is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 35V, the duty ratio is 80 percent, the output frequency is 1000Hz, and the output current density is 0.1A/dm2. The ultrasonic frequency is 30 KHz. The results of the treatment are shown in Table 5.
TABLE 5 treatment Effect of phosphorus-containing wastewater at different residence times
| Index of residence time | TP before treatment (mg/L) | TP (mg/L) after treatment | Removal Rate (%) |
| 30min | 10 | 8.8 | 12 |
| 60min | 10 | 7.5 | 25 |
Comparative example 2
Different from the example 1, in the comparative example, the method for treating the phosphorus-containing wastewater by the ultrasonic alternating current flocculation adopts sodium hydroxide to adjust the pH value of the simulated wastewater to 8, polar plates in an electrocoagulation reaction tank are soluble iron plates which are connected in parallel, the polar plates are arranged in a baffle plate type, and the polar plates are arranged in parallelIs 1cm apart. The power supply in the electric flocculation reaction tank is an alternating current power supply, the input frequency is 50Hz, the voltage is 220V, the output voltage is 25V, the duty ratio is 80 percent, the output frequency is 50Hz, and the output current density is 2A/dm2. The results of the treatment are shown in Table 6.
TABLE 6 treatment Effect of phosphorus-containing wastewater at different residence times
| Index of residence time | TP before treatment (mg/L) | TP (mg/L) after treatment | Removal Rate (%) |
| 30min | 10 | 7.8 | 22 |
| 60min | 10 | 6.7 | 33 |
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. An ultrasonic alternating current flocculation phosphorus removal device is characterized by comprising:
the electrolytic flocculation reaction tank (3) is internally provided with a plurality of first polar plates (4) and second polar plates (5) which are parallel to each other from left to right, and the first polar plates (4) and the second polar plates (5) are respectively connected with two electrodes of a pulse alternating current power supply (7);
an ultrasonic generator (8), wherein an ultrasonic probe (6) of the ultrasonic generator (8) is positioned in the electrocoagulation reaction tank (3).
2. The ultrasonic AC flocculation dephosphorization apparatus according to claim 1, wherein: the first polar plate (4) and the second polar plate (5) are arranged in a vertically staggered manner to form a return reaction flow channel for wastewater to flow.
3. The ultrasonic AC flocculation dephosphorization apparatus according to claim 2, wherein: the device is characterized by further comprising a pH adjusting pool (1), wherein the pH adjusting pool (1) is communicated with the inlet end of the turn-back reaction flow channel through a pipeline.
4. The ultrasonic AC flocculation dephosphorization apparatus according to claim 3, wherein: and a water inlet pump (2) is arranged on the pipeline.
5. The ultrasonic AC flocculation dephosphorization apparatus according to any one of claims 1-4, wherein: the first polar plate (4) and the second polar plate (5) are both made of iron plates.
6. The ultrasonic AC flocculation dephosphorization apparatus according to claim 5, wherein: the distance between the adjacent first polar plate (4) and the second polar plate (5) is controlled to be 1-5 cm.
7. An ultrasonic alternating current flocculation dephosphorization method is characterized by comprising the following steps:
step 1, adjusting the pH value of the wastewater by acid or alkali;
step 2, pumping the wastewater with the adjusted pH value into an electric flocculation reaction tank (3) through a pump, and simultaneously carrying out alternating current flocculation under the low-frequency ultrasonic condition;
a first polar plate (4) and a second polar plate (5) are alternately arranged in parallel in the electrocoagulation reaction tank (3) from left to right, the first polar plate (4) and the second polar plate (5) are staggered up and down to form a turn-back reaction flow channel, and wastewater is folded and flows through the turn-back reaction flow channel;
and 3, allowing the treated wastewater to flow out of the electric flocculation reaction tank (3), standing the discharged water, and discharging supernatant.
8. The ultrasonic AC flocculation dephosphorization method according to claim 7, wherein: the power supply of the electric flocculation reaction tank (3) is a pulse alternating current power supply (7), the output voltage is 0-40V, the output frequency is 50Hz-1000Hz, and the output current density is 0.25A/dm2-4.0A/dm2The frequency of the ultrasonic wave is 10-50 KHz.
9. The ultrasonic AC flocculation dephosphorization method according to claim 8, wherein: the distance between the adjacent first polar plate (4) and the second polar plate (5) is controlled to be 1-5 cm.
10. The ultrasonic AC flocculation dephosphorization method according to claim 9, wherein: and adjusting the pH value of the wastewater to 3-10 by acid or alkali.
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