CN108163935B - High-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment and treatment method thereof - Google Patents
High-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment and treatment method thereof Download PDFInfo
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- CN108163935B CN108163935B CN201810175750.0A CN201810175750A CN108163935B CN 108163935 B CN108163935 B CN 108163935B CN 201810175750 A CN201810175750 A CN 201810175750A CN 108163935 B CN108163935 B CN 108163935B
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- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 28
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000009713 electroplating Methods 0.000 claims abstract description 7
- 239000002912 waste gas Substances 0.000 claims abstract description 7
- 239000007921 spray Substances 0.000 claims description 36
- 239000002351 wastewater Substances 0.000 claims description 25
- 239000003814 drug Substances 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 11
- 239000010936 titanium Substances 0.000 claims description 11
- 229910052719 titanium Inorganic materials 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 7
- 150000003841 chloride salts Chemical class 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 4
- 239000000523 sample Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000000243 solution Substances 0.000 abstract description 5
- 239000008364 bulk solution Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000010287 polarization Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 2
- 125000001309 chloro group Chemical class Cl* 0.000 abstract 1
- 238000003672 processing method Methods 0.000 abstract 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006555 catalytic reaction Methods 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000002848 electrochemical method Methods 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 238000006056 electrooxidation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- HJPBEXZMTWFZHY-UHFFFAOYSA-N [Ti].[Ru].[Ir] Chemical compound [Ti].[Ru].[Ir] HJPBEXZMTWFZHY-UHFFFAOYSA-N 0.000 description 2
- QLGFXFCQAIDVFZ-UHFFFAOYSA-N [Ti].[Ti].[Ir].[Ru] Chemical compound [Ti].[Ti].[Ir].[Ru] QLGFXFCQAIDVFZ-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000011197 physicochemical method Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QDHHCQZDFGDHMP-UHFFFAOYSA-N Chloramine Chemical compound ClN QDHHCQZDFGDHMP-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052567 struvite Inorganic materials 0.000 description 1
Classifications
-
- 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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
- C02F1/766—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine
-
- 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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
-
- 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
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46152—Electrodes characterised by the shape or form
-
- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/46—Apparatus for electrochemical processes
- C02F2201/461—Electrolysis apparatus
- C02F2201/46105—Details relating to the electrolytic devices
Abstract
The invention discloses high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment which comprises a power supply, an electrode plate, an electrolysis tank, a water pump and a water tank. The water inlet end of the electrolytic tank is connected with the water inlet end of the water tank, and the water outlet end of the water tank is connected with the water inlet end of the water pump; also included is an exhaust gas treatment system that, the waste gas treatment system is connected with the electrolytic tank through a pipeline; the power supply is a numerical control double-pulse electroplating high-frequency pulse power supply. The invention also discloses a processing method based on the equipment, which comprises the following three steps: adding chlorine salt, pumping water, and electrolyzing. Compared with the traditional direct-current high-frequency pulse power supply, the numerical control double-pulse electroplating high-frequency pulse power supply can reduce concentration polarization caused by electrode potential deviation from balance potential due to the difference of the ion concentration of the electrode interface layer solution in the electrolytic tank and the concentration of the bulk solution, and reduce unit energy consumption by 30% -60%.
Description
Technical Field
The invention relates to a treatment technology of ammonia nitrogen wastewater, in particular to a treatment technology of ammonia nitrogen wastewater, relates to a high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment device and a treatment method thereof.
Background
At present, the problem of environmental pollution is increasingly serious, and the treatment of ammonia nitrogen in water is a problem to be solved urgently. The existing industrial ammonia nitrogen wastewater treatment method mainly comprises a physicochemical method and a biological method, but has great differences and great disadvantages in treatment technology aiming at different types of wastewater due to the difference of water quality indexes and the limitation of process conditions.
In the physicochemical method: the blowing and degassing extraction method is only suitable for treating wastewater containing high-concentration ammonia nitrogen, and the treatment is difficult to reach the standard, so that atmospheric pollution is easy to cause; the adsorption capacity of the adsorbent in the ion exchange method is small, and the adsorbent is not suitable for treating wastewater with high salt content. The magnesium ammonium phosphate precipitant in the chemical precipitation method has higher price, is used for treating ammonia nitrogen, and has low economic benefit; the break point chlorination method has larger chlorine demand and high cost, and the formed chloramine and chlorinated organic compounds are easy to pollute the environment, and the break point is not easy to grasp in the operation.
The biological method has large occupied area of the reactor, and organic matters are additionally provided as carbon sources of microorganisms, and the reaction period is long.
Disclosure of Invention
In recent years, the electrochemical oxidation method has the advantages of small occupied space, simple operation, strong controllability and the like due to the special equipment, and is widely applied to the field of treatment of various ammonia nitrogen wastewater. The invention aims to overcome the defects of the prior art and provides an electrochemical oxidation method and equipment for treating ammonia nitrogen wastewater, namely high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment and a treatment method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment comprises a power supply, an electrode plate, an electrolysis tank, a water pump and a water tank, and is characterized in that the electrolysis tank, the water pump and the water tank are sequentially connected through a pipeline to form a closed pipeline, the water inlet end of the electrolysis tank is connected with the water outlet end of the water pump, the water outlet end of the electrolysis tank is connected with the water inlet end of the water tank, and the water outlet end of the water tank is connected with the water inlet end of the water pump; the system also comprises an exhaust gas treatment system, wherein the exhaust gas treatment system is connected with the electrolytic tank through a pipeline; the power supply is a numerical control double-pulse electroplating high-frequency pulse power supply.
The further technical scheme is as follows: a plurality of groups of electrode plates are arranged in the electrolytic tank, and the electrode plates are vertically arranged in the electrolytic tank; the anode plate of the electrode plate is a net-shaped titanium-plated ruthenium-iridium-titanium net, and the cathode plate of the electrode plate is a titanium-storing net-shaped titanium net; the distance between the adjacent electrode plates is 5-10 mm, and the two ends of the electrode plates are respectively connected with the cathode and the anode of the high-frequency pulse power supply.
The further technical scheme is as follows: the conductive copper strips of the electrode plates are coated with titanium metal layers.
The further technical scheme is as follows: the pore diameter of the anode titanium ruthenium iridium titanium plated screen plate is 1-10 mm, and the pore diameter of the cathode titanium storage screen plate is 1-10 mm.
The further technical scheme is as follows: the water pump is a magnetic circulating pump, and the water tank is a circulating water tank.
The further technical scheme is as follows: the waste gas treatment system comprises a spray tower with a gas inlet connected with a waste gas outlet, a gas outlet at the top of the spray tower is connected with a gas inlet of the centrifugal fan, and the gas inlet of the spray tower is arranged at the side edge of the spray tower and is about one fourth of the height of the tower body from the bottom of the spray tower;
the further technical scheme is as follows: the waste gas treatment system also comprises a pH probe which is arranged in the spray tower and is close to the air inlet of the spray tower; the spray tower is sequentially divided into a medicament layer, an air layer, a first filling layer, a first water spraying layer, a second filling layer, a second water spraying layer and a demisting layer from bottom to top, and the medicament layer is filled with medicament by an external medicament adding metering pump; the floating ball is arranged in the medicament layer and used for marking the liquid level of the medicament, and the overflow valve is arranged at the side of the air inlet of the far spray tower; the side of the spray tower is provided with a plurality of transparent windows for monitoring the working state in the spray tower.
A high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment method comprises three steps; the method is characterized in that the first step is adding chloride salt into ammonia nitrogen wastewater; continuously conveying ammonia nitrogen wastewater in the circulating water tank into an electrolytic tank through a magnetic circulating pump; and step three, starting a high-frequency pulse power supply to load pulse current to electrolyze in the electrolytic tank.
The further technical scheme is as follows: the concentration of chloride ions in the chloride salt is 20-500 mg/L.
The further technical scheme is as follows: the electrode plate is divided into a cathode plate and an anode plate, and the current density of the electrode plate is 50-300A/m < 2 >.
Compared with the traditional electrochemical oxidation equipment and method, the high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment and method provided by the invention have the following remarkable advantages:
1. compared with the traditional direct-current high-frequency pulse power supply, the numerical control double-pulse electroplating high-frequency pulse power supply can reduce concentration polarization caused by electrode potential deviation from balance potential due to the difference of the ion concentration of an electrode interface layer solution in an electrolytic tank and the concentration of a bulk solution, and reduce unit energy consumption by 30% -60%;
2. the anode is a net-shaped titanium ruthenium-plated iridium plate, and the cathode is a net-shaped stainless steel plate. The waste water flow in the electrolytic tank contacts with the front surface of the reticular polar plate and flows vertically, so that the mass transfer strength of pollutants is improved;
3. the invention can be suitable for the treatment of wastewater containing ammonia and nitrogen with various concentrations, the degradation ammonia nitrogen is hardly influenced by the concentration of the ammonia nitrogen, when the concentration of the ammonia nitrogen is increased, the increase of the conduction efficiency in the solution accelerates the catalytic reaction, and simultaneously reduces the voltage in proportion to the degradation and the catalytic reaction of the ammonia nitrogen;
4. the invention is not limited by temperature environmental factors, can be carried out at normal temperature and normal pressure, can adjust the optimal energy efficiency ratio along with the height of ammonia nitrogen trial, has simple control of temperature reaction conditions and equipment operation, has small occupied area of about 5-10 square meters, and can realize on-site or mobile treatment without increment of water discharge; side crops are not generated in the treatment process, the waste water contains COD (chemical oxygen demand) which is difficult to degrade and other toxic and harmful substances of heavy metals, the catalysis of ammonia gas converted from the ammonia nitrogen waste water through electrocatalytic conversion is not influenced, and meanwhile, the catalytic degradation and the heavy metal recovery of the COD heavy metals and other harmful substances in the waste water are also carried out;
5. compared with the traditional electrochemical method adopting a high chloride ion concentration system, the electrochemical method adopting a low chloride ion concentration system has the effects of reducing corrosion of polar plates and equipment, prolonging the service lives of the equipment and the polar plates, and simultaneously realizing high-efficiency treatment of ammonia nitrogen.
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Drawings
FIG. 1 is a schematic view of the front section structure of the treatment apparatus of the present invention;
FIG. 2 is a schematic view of the back end structure of the treatment apparatus of the present invention;
FIG. 3 is an enlarged view of a portion of a drug layer device of the present invention;
FIG. 4 is an enlarged cross-sectional view of an electrolytic cell of the treatment apparatus of the present invention.
FIG. 5 is an enlarged view of a portion of the plate electrode embedding cartridge hinge assembly of the present invention.
Each serial number in the figure identifies:
1-water tank, 2-power supply, 3-cathode plate, 4-anode plate, 5-water pump, 6-electrolytic tank, 7-spray tower, 8-centrifugal fan, 9-transparent window, 10-dosing metering pump, 11-pH probe, 12-overflow valve, 13-floating ball, 14-circulating pump, 15-drainage slope, water-discharging device and water-discharging device,
601-reinforcing strips, 602-titanium mesh, 603-liquid medicine reflux box, 604-conductive Fang Tongtiao, 605-conductive titanium copper-clad strips,
701-medicament layer, 702-air layer, 703-first filling layer, 704-first water spraying layer, 705-second filling layer, 706-second water spraying layer, 707-defogging layer,
201-fixing seat, 202-sliding block, 203-clamping seat, 204-moving seat, 205-gear, 206-rack and 207-baffle.
Detailed Description
In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention, but the invention may be practiced in other ways than as described, and therefore the scope of the invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, the high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment comprises a power supply 2, an electrode plate (comprising a cathode plate 3 and an anode plate 4), an electrolytic tank 6, a water pump 5 and a water tank 1. The power supply 2 is a numerical control double-pulse electroplating high-frequency pulse power supply, the electrolytic tank 6, the water pump 5 and the water tank 1 are sequentially connected through pipelines to form a closed pipeline, the water inlet end of the electrolytic tank 6 is connected with the water outlet end of the water pump 5, the water outlet end of the electrolytic tank 6 is connected with the water inlet end of the water tank 1, and the water outlet end of the water tank 1 is connected with the water inlet end of the water pump 5. The water pump 5 is a magnetic circulating pump, and the water tank 1 is a circulating water tank.
As can be seen from fig. 1 and 2, the high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment device of the present invention further comprises an exhaust gas treatment system, wherein the exhaust gas treatment system is connected with the electrolytic tank 6 through a pipeline.
As shown in fig. 1, in embodiment 1,
a plurality of groups of electrode plates are arranged in the electrolytic tank 6, and the electrode plates are erected in the electrolytic tank 6; the anode plate 4 of the electrode plate is a net-shaped titanium-plated ruthenium-iridium-titanium net, and the cathode plate 3 of the electrode plate is a titanium-storing net-shaped titanium net; the cathode plate 3 and the anode plate 4 are arranged periodically at intervals in sequence, the interval between the adjacent electrode plates is 5-10 mm, the clamping groove used for embedding the electrode plates in the electrolytic tank 6 is a movable clamping groove, the interval between the adjacent electrode plates is adjustable, and the two ends of the electrode plates are respectively connected with the cathode and the anode of the high-frequency pulse power supply 2.
As shown in fig. 5, in embodiment 2,
the clamping seat mechanism used for embedding and fixing the electrode plates in the electrolytic tank 6 is a hinge movable mechanism, and the purpose of adjustable space between adjacent electrode plates is also realized. The cathode plate and the periodically spaced electrode plates of the anode plate are fixedly embedded on the clamping seat 203, the clamping seat 203 at the outermost side of one end of the fixing seat 201 is fixedly maintained, the clamping seat 203 at the end of the other side of the fixing seat is connected with the moving seat 204, a motor is arranged in the moving seat 204 to provide power for the moving device, a gear 205 at the bottom of the moving seat 204 and a rack 206 are in meshed transmission under the driving of the motor, a sliding block 202 on the clamping seat 203 moves up and down in the moving process of the clamping seat 203, the distance between adjacent electrode plates is adjustable, the gear 205 at the outermost end is in meshed transmission with the rack 206, and the influence of electrolyte fluctuation in an electrolytic tank 6 on the distance between the electrode plates in the working process is effectively weakened while stable adjustment of the distance between the electrode plates is ensured. The movable seat 204 is also connected with a partition plate 207, the partition plate 207 is placed in the electrolytic tank 6 to separate the space in the tank, and the partitioned space in the electrolytic tank 6 is synchronously moved along with the movable seat 204, so that electrolyte is only required to be added into the space on one side where the electrode plate is located, the use amount of the electrolyte is saved, and the cost is reduced.
As shown in fig. 4, the conductive copper strips of the electrode plates are coated with a titanium metal layer to form conductive titanium-coated copper strips 605. The aperture of the anode titanium ruthenium iridium titanium screen plate of the anode plate 4 is 1-10 mm, and the aperture of the cathode titanium screen plate of the cathode plate 3 is 1-10 mm.
As shown in fig. 2, the exhaust gas treatment system comprises a spray tower 7 with an air inlet connected with an exhaust gas outlet, an air outlet at the top of the spray tower 7 is connected with an air inlet of a centrifugal fan 8, and the air inlet of the spray tower 7 is arranged at the side edge of the spray tower 7 and is spaced from the bottom of the spray tower 7 by about one quarter of the height of the tower body.
As can be seen in conjunction with fig. 3, in embodiment 3,
the waste gas treatment system also comprises a pH probe 11 which is arranged inside the spray tower 7 and is close to the air inlet of the spray tower 7; the spray tower 7 is sequentially divided into a medicament layer 701, an air layer 702, a first filling layer 703, a first water spraying layer 704, a second filling layer 705, a second water spraying layer 706 and a demisting layer 707 from bottom to top, wherein the medicament layer 701 is filled with medicament by the external medicament adding metering pump 10; a floating ball 13 is arranged in the medicament layer 701 to mark the liquid level of the medicament, and an overflow valve 12 is arranged on the air inlet side of the far spray tower 7; the tower side of the spray tower 7 is provided with a plurality of transparent windows 9 for monitoring the working state in the spray tower. The circulation pump 14 is used for supplying water into the spray tower 7 uninterruptedly and is used for spraying and purifying waste gas from top to bottom in the tower. The drain ramp 15 is a beveled structure which facilitates the complete draining of liquid as it is drained from the spray tower 7.
A high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment method comprises three steps; step one, adding chloride salt, pumping water by a step two, and electrolyzing, wherein the step one is to add the chloride salt into ammonia nitrogen wastewater; continuously conveying ammonia nitrogen wastewater in the circulating water tank 1 into the electrolytic tank 6 through the magnetic circulating water pump 5; and thirdly, starting the high-frequency pulse power supply 2 to load pulse current to electrolyze in the electrolytic tank 6.
The concentration of chloride ions in the chloride salt added in the first step is 20-500 mg/L.
The current density of the electrode plate in the third step is 50-300A/m 2 。
In summary, the high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment provided by the invention adopts the numerical control double-pulse electroplating high-frequency pulse power supply to provide electric energy, so that compared with the traditional direct-current high-frequency pulse power supply, concentration polarization caused by deviation of electrode potential from balance potential due to difference of electrode interface layer solution ion concentration and bulk solution concentration in an electrolytic tank can be reduced, and unit energy consumption is reduced by 30% -60%;
because a plurality of groups of polar plates are placed at intervals of 5-10 mm, the anode is a net-shaped titanium ruthenium-plated iridium polar plate, and the cathode is a net-shaped stainless steel polar plate. The waste water flow in the electrolytic tank contacts with the front surface of the reticular polar plate and flows vertically, so that the mass transfer strength of pollutants is improved;
the invention can be suitable for the treatment of wastewater containing ammonia and nitrogen with various concentrations, the degradation ammonia nitrogen is hardly influenced by the concentration of the ammonia nitrogen, when the concentration of the ammonia nitrogen is increased, the increase of the conduction efficiency in the solution accelerates the catalytic reaction, and simultaneously reduces the voltage in proportion to the degradation and the catalytic reaction of the ammonia nitrogen;
the invention is not limited by temperature environmental factors, can be carried out at normal temperature and normal pressure, can adjust the optimal energy efficiency ratio along with the height of ammonia nitrogen trial, has simple control of temperature reaction conditions and equipment operation, has small occupied area of about 5-10 square meters, and can realize on-site or mobile treatment without increment of water discharge; side crops are not generated in the treatment process, the waste water contains COD (chemical oxygen demand) which is difficult to degrade and other toxic and harmful substances of heavy metals, the catalysis of ammonia gas converted from the ammonia nitrogen waste water through electrocatalytic conversion is not influenced, and meanwhile, the catalytic degradation and the heavy metal recovery of the COD heavy metals and other harmful substances in the waste water are also carried out;
compared with the traditional electrochemical method adopting a high chloride ion concentration system, the electrochemical method adopting a low chloride ion concentration system has the effects of reducing corrosion of polar plates and equipment, prolonging the service lives of the equipment and the polar plates, and simultaneously realizing high-efficiency treatment of ammonia nitrogen.
The foregoing is merely illustrative of the present invention to facilitate understanding, but is not intended to limit the scope of the invention to any way of extension or re-creation according to the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. The high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment equipment comprises a power supply, an electrode plate, an electrolysis tank, a water pump and a water tank, and is characterized in that the electrolysis tank, the water pump and the water tank are sequentially connected through a pipeline to form a closed pipeline, the water inlet end of the electrolysis tank is connected with the water outlet end of the water pump, the water outlet end of the electrolysis tank is connected with the water inlet end of the water tank, and the water outlet end of the water tank is connected with the water inlet end of the water pump; the system also comprises an exhaust gas treatment system, wherein the exhaust gas treatment system is connected with the electrolytic tank through a pipeline; the power supply is a numerical control double-pulse electroplating high-frequency pulse power supply;
a plurality of groups of electrode plates are arranged in the electrolytic tank, and the electrode plates are vertically arranged in the electrolytic tank; the cathode plates and the anode plates of the electrode plates are sequentially and periodically arranged, the distance between the adjacent electrode plates is 5-10 mm, and the two ends of the electrode plates are respectively connected with the cathode and the anode of the high-frequency pulse power supply; the clamping seat mechanism used for embedding and fixing the electrode plates in the electrolytic tank is a hinge movable mechanism, the periodically spaced electrode plates of the cathode plate and the anode plate are embedded and fixed on the clamping seat, the clamping seat at the outermost side of one end of the fixing seat is kept fixed, the clamping seat at the end part of the other side of the fixing seat is connected with the movable seat, a motor is arranged in the movable seat, a gear at the bottom of the movable seat is meshed with a rack for transmission under the driving of the motor, and a sliding block on the clamping seat moves up and down in the moving process of the clamping seat, so that the interval between the adjacent electrode plates is adjustable, and the gear at the outermost end is meshed with the rack for transmission; the movable seat is also connected with a baffle plate, and the baffle plate is placed in the electrolytic tank to separate the space in the tank and synchronously moves along with the movable seat.
2. The high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment device according to claim 1, wherein the conductive copper strips of the electrode plates are coated with a titanium metal layer.
3. The high-frequency pulse electrolysis type ammonia nitrogen wastewater treatment device according to claim 1, wherein the water pump is a magnetic circulating pump, and the water tank is a circulating water tank.
4. The high-frequency pulse electrolysis ammonia nitrogen wastewater treatment device according to claim 1, wherein the exhaust gas treatment system comprises a spray tower with an air inlet connected with the exhaust gas outlet, an air outlet at the top of the spray tower is connected with an air inlet of a centrifugal fan, and the air inlet of the spray tower is arranged at the side edge of the spray tower and is a quarter of the height of the tower body from the bottom of the spray tower.
5. The high-frequency pulse electrolysis ammonia nitrogen wastewater treatment device according to claim 4, wherein the waste gas treatment system further comprises a pH probe arranged inside the spray tower and close to the air inlet of the spray tower; the spray tower is sequentially divided into a medicament layer, an air layer, a first filling layer, a first water spraying layer, a second filling layer, a second water spraying layer and a demisting layer from bottom to top, and the medicament layer is filled with medicament by an external medicament adding metering pump; the floating ball is arranged in the medicament layer and used for marking the liquid level of the medicament, and the overflow valve is arranged at the side of the air inlet of the far spray tower; the side of the spray tower is provided with a plurality of transparent windows for monitoring the working state in the spray tower.
6. A high-frequency pulse electrolytic ammonia nitrogen wastewater treatment method adopts the high-frequency pulse electrolytic ammonia nitrogen wastewater treatment equipment of claim 3, comprising three steps; the method is characterized in that the first step is adding chloride salt into ammonia nitrogen wastewater; continuously conveying ammonia nitrogen wastewater in the circulating water tank into an electrolytic tank through a magnetic circulating pump; and step three, starting a high-frequency pulse power supply to load pulse current to electrolyze in the electrolytic tank.
7. The method for treating high-frequency pulse electrolysis type ammonia nitrogen wastewater according to claim 6, wherein the concentration of chloride ions in the chloride salt is 20-500 mg/L.
8. The method for treating high-frequency pulse electrolysis type ammonia nitrogen wastewater according to claim 6, wherein the current density of the electrode plate is 50-300A/m 2.
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