CN114835310A - Electrochemical-ammonia nitrogen recovery combined system for efficiently treating industrial nitrogen-containing wastewater and application thereof - Google Patents
Electrochemical-ammonia nitrogen recovery combined system for efficiently treating industrial nitrogen-containing wastewater and application thereof Download PDFInfo
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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
- C02F1/46—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
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- 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
-
- 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
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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
- C02F1/46—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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses an electrochemistry-ammonia nitrogen recovery combined system for efficiently treating industrial nitrogen-containing wastewater and application thereof. The system comprises an electrolysis device and an ammonia nitrogen recovery device, wherein: the electrolysis device comprises an electrolysis cell and a power supply; the ammonia nitrogen recovery device comprises an ammonia nitrogen recovery tank and an absorption liquid storage tank; the ammonia nitrogen recovery tank comprises a shell and hydrophobic hollow fiber membrane filaments which are gathered into bundles inside the shell; a first water pump is arranged between the electrolytic cell and the ammonia nitrogen recovery tank, wastewater in the electrolytic cell is led into the hydrophobic hollow fiber membrane filaments to flow, then returns to the electrolytic cell and circulates; and a second water pump is arranged between the ammonia nitrogen recovery tank and the liquid storage tank, and the absorption liquid in the liquid storage tank is introduced to the outside of the hydrophobic hollow fiber membrane yarn to flow, then returns to the liquid storage tank and circulates. The invention synchronously combines the electrochemical reduction process of nitrate nitrogen and the selective recovery process of ammonia nitrogen, thereby not only realizing the rapid and low-cost removal of the total nitrogen in the industrial wastewater, but also realizing the resource recycling of the ammonia nitrogen.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to an electrochemistry-ammonia nitrogen recovery combined system for efficiently treating industrial nitrogen-containing wastewater and application thereof.
Background
Too high total nitrogen content in water can cause eutrophication of water environment, thereby causing species distribution imbalance of the water ecosystem. At present, the COD of a water body can be effectively reduced by a traditional sewage treatment mode, but the treatment effect on total nitrogen is not ideal, and because nitrate nitrogen and ammonia nitrogen in the total nitrogen mainly exist in an inorganic ion form, the common physical and chemical treatment means is difficult to realize low-cost and high-efficiency removal. At present, the biological method for removing the total nitrogen in the wastewater is a mainstream industrial application strategy, but the biological method for removing the nitrogen has high time cost and operation cost, and has some defects in the operation process, such as generation of a large amount of sludge, need of adding a carbon source, complex operation and maintenance and the like.
The electrochemical denitrification is a denitrification treatment mode which has the advantages of high treatment efficiency, simple and easy equipment, low running cost and the like. The reduction reaction of nitrate and nitrogen is the key and difficult point of the whole electrochemical denitrification process, and the important factor influencing the reduction activity and the product selectivity is the selection of a catalytic electrode. The electrochemical reduction reaction of the nitro-nitrogen mainly means that the nitro-nitrogen is catalytically reduced to nitrite nitrogen, nitrogen and ammonia nitrogen on an electrode. Among them, nontoxic nitrogen is the most ideal target product, however, the activity and selectivity of reducing nitrate nitrogen to nitrogen are very low, and the requirement of industrial wastewater treatment cannot be met. Compared with nitrogen, ammonia nitrogen is a nitrate nitrogen reduction product which is relatively easy to obtain, but the total nitrogen value is still high due to the ammonia nitrogen, and the ammonia nitrogen is continuously oxidized into nitrate nitrogen by the anode, so that the removal efficiency of the nitrate nitrogen is reduced, and the electric energy is not utilized effectively. For the electrochemical treatment of ammonia nitrogen, active chlorine (broken chlorine) generated by the anodic chlorine evolution reaction is generally used for oxidizing and degrading the ammonia nitrogen into nitrogen, although the efficiency is considerable, the toxic gas, namely chlorine, generated by the anodic chlorine evolution reaction can cause serious corrosion of equipment and potential safety hazard of production, and the development of the electrochemical denitrification technology is also restricted by the problem.
Therefore, seeking a cathode electrode material with high catalytic activity and low price to improve the activity and selectivity of nitrate-nitrogen reduction, and synchronously removing ammonia nitrogen by adopting a more environment-friendly and safe method is the key for solving the development bottleneck of the electrochemical denitrification technology.
Disclosure of Invention
The invention aims at solving the technical problem of denitrification in industrial wastewater and provides a combined treatment technology of electrochemical reduction and ammonia nitrogen recovery, which has the advantages of excellent total nitrogen removal effect, simple process and more environmental protection.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides an electrochemistry-ammonia nitrogen recovery combined system of high-efficient processing industry nitrogenous waste water, including electrolytic device and ammonia nitrogen recovery unit, wherein:
the electrolysis device comprises an electrolysis cell and a power supply, wherein the electrolysis cell comprises a plurality of cathodes and anodes which are arranged in a staggered mode, and the cathodes and the anodes are connected in series respectively and then are connected with the power supply;
the ammonia nitrogen recovery device comprises an ammonia nitrogen recovery tank and an absorption liquid storage tank; the ammonia nitrogen recovery tank comprises a shell and hydrophobic hollow fiber membrane filaments which are arranged in the shell and are gathered into bundles;
a first water pump is arranged between the electrolytic cell and the ammonia nitrogen recovery tank, wastewater in the electrolytic cell is introduced into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank to flow, and then the wastewater returns to the electrolytic cell and circulates;
and a second water pump is arranged between the ammonia nitrogen recovery tank and the liquid storage tank, and the absorption liquid in the liquid storage tank is introduced into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank to flow outside, then returns to the liquid storage tank and circulates.
According to the scheme, the gaps between the hydrophobic hollow fiber membrane filaments at the head end and the tail end of the ammonia nitrogen recovery tank and the gaps between the hydrophobic hollow fiber membrane filaments and the shell of the ammonia nitrogen recovery tank are sealed. Preferably, the sealing process is to fill the voids with epoxy. After the gap between the hydrophobic fiber membrane tows and the shell is sealed, the hydrophobic fiber membrane tows can be tightly connected with the shell, and the hardened epoxy resin serves as a partition plate.
According to the scheme, the ammonia nitrogen recovery tank is also provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; wherein: the first water inlet and the first water outlet are communicated with the interior of the hydrophobic hollow fiber membrane yarn, and the first water pump is connected with the first water inlet; the second water inlet and the second water outlet are communicated with the outside of the hydrophobic hollow fiber membrane yarn, and the second water pump is connected with the second water inlet.
According to the scheme, the cathode is made of brass, and the anode is a dimensionally stable electrode.
Preferably, the cathode is a brass net, and is folded for use.
Preferably, the brass electrode has an elemental composition of: copper: 55 to 65 percent; zinc: 35 to 45 percent.
Preferably, the anode includes, but is not limited to, IrO 2 -RuO 2 Ti electrode and PbO 2 A Ti electrode.
According to the scheme, the cathodes and the anodes are connected in series through copper wires and are respectively connected to the negative electrode and the positive electrode of a power supply.
According to the scheme, the length of the shell of the ammonia nitrogen recovery tank is 30-200 cm, and the diameter of the shell of the ammonia nitrogen recovery tank is 8-40 cm.
According to the scheme, the material of the hydrophobic hollow fiber membrane silk comprises but is not limited to one of polypropylene, polytetrafluoroethylene and polyvinyl chloride.
According to the scheme, the inner diameter of the hydrophobic hollow fiber membrane wire is 0.2-1.5 mm. Preferably, the outer diameter is 0.4-2 mm.
According to the scheme, the distance between the cathode and the anode is controlled to be 1-10 cm.
Provides the application of the electrochemical-ammonia nitrogen recovery combined system for efficiently treating the industrial nitrogen-containing wastewater in treating the industrial nitrogen-containing wastewater.
The process for efficiently treating the industrial nitrogen-containing wastewater is provided, and the electrochemical-ammonia nitrogen recovery combined system comprises the following steps:
1) adding industrial nitrogen-containing wastewater into an electrolytic cell, and adding an absorption liquid into a liquid storage tank;
2) electrifying for electrolysis, simultaneously introducing the wastewater in the electrolytic cell into an ammonia nitrogen recovery tank, flowing in the hydrophobic hollow fiber membrane filaments, and finally returning to the electrolytic cell for circulation; synchronously introducing the absorption liquid in the liquid storage tank into the ammonia nitrogen recovery tank, flowing outside the hydrophobic hollow fiber membrane filaments, finally returning to the liquid storage tank, and circulating;
3) and monitoring the nitrogen content of the wastewater in the electrolytic cell, and finishing the treatment process when the effluent index is met.
According to the scheme, in the step 1), the industrial nitrogen-containing wastewater is industrial nitrogen-containing wastewater mainly containing nitrate nitrogen or mixed nitrogen-containing wastewater containing nitrate nitrogen and ammonia nitrogen.
According to the scheme, in the step 1), the absorption liquid is an aqueous solution of sulfuric acid or hydrochloric acid, and the concentration of the aqueous solution is 0.1-10 mol/L.
According to the scheme, in the step 2), the current density during the electrolytic reaction is 0.5-20 mA/cm 2 。
According to the scheme, in the step 2), the flow speed of the wastewater in the hydrophobic hollow fiber membrane filaments is 5-100L/h during electrolysis; the flowing speed of the absorption liquid outside the hydrophobic hollow fiber membrane filaments is 5-100L/h.
According to the scheme, in the step 2), the wastewater in the electrolytic cell is guided into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank through a first water pump; and the absorption liquid in the liquid storage tank is led into the outside of the hydrophobic hollow fiber membrane yarn of the ammonia nitrogen recovery tank through a second water pump.
Preferably, the first water pump pumps the wastewater in the electrolytic cell into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank through the first water inlet, and then the wastewater flows out of the second water outlet and returns to the electrolytic cell.
Preferably, the second water pump pumps the wastewater in the electrolytic cell into the outside of the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank through the second water inlet, and then the wastewater flows out of the second water outlet and returns to the liquid storage tank.
Under the condition of electrification and electrolysis, nitrate nitrogen in the industrial nitrogen-containing wastewater is selectively reduced to ammonia nitrogen on the surface of a cathode, and meanwhile, the catalytic reaction consumes hydrogen ions in water to generate hydroxyl ions, so that the solution is strong in alkalinity. According to the invention, an electrochemical electrolysis process and an ammonia nitrogen recovery device are directly combined, wastewater in electrolysis is led into the interior of a hydrophobic hollow fiber membrane yarn in an ammonia nitrogen recovery tank, and an absorption liquid is led into the exterior of the hydrophobic hollow fiber membrane yarn; when the pH value of the wastewater rises, ammonia nitrogen is easy to volatilize from the wastewater, penetrates through the tube wall of the hydrophobic hollow fiber membrane filament in the form of ammonia gas, and is absorbed by the absorption liquid on the other side of the membrane filament in time, so that the ammonia nitrogen is prevented from being oxidized by an anode in the electrolytic cell to return nitrate nitrogen; the combined synergistic effect of electrolysis and ammonia nitrogen recovery finally realizes the improvement of the removal efficiency of nitrate nitrogen and total nitrogen and the resource recycling of ammonia nitrogen.
The invention has the following beneficial effects:
1. the invention provides an electrochemistry-ammonia nitrogen recovery combined system, through the circulation of waste water in electrolysis in the interior of a hydrophobic hollow fiber membrane wire in an ammonia nitrogen recovery tank, ammonia gas generated in the waste water is released along with the increase of pH and then absorbed in time by absorption liquid circulating outside the hydrophobic hollow fiber membrane wire, so that the system has an obvious promotion effect on the reduction reaction of nitrate nitrogen in an electrolytic cell, can improve the reduction rate of the nitrate nitrogen, avoids the ammonia nitrogen from being oxidized by an anode in the electrolytic cell to return the nitrate nitrogen, and has high removal efficiency of the nitrate nitrogen and total nitrogen; meanwhile, the absorption liquid can be dried and dehydrated to obtain ammonium salt with high purity and less impurities, and the ammonium salt can be used as a nitrogen fertilizer, so that resource recycling of ammonia nitrogen is realized.
2. The invention reduces the nitrate nitrogen in the industrial wastewater by adopting an electrochemical method, and then recovers the ammonia nitrogen of the reduction product with high efficiency and high selectivity, thereby realizing the removal of the ammonia nitrogen in the water without chlorination, having simple structure and saving the cost of waste gas treatment equipment; the removal efficiency of nitrate nitrogen and total nitrogen is high, the effluent index is stable, and the large-scale and automatic industrial wastewater treatment can be realized.
3. Furthermore, the brass is adopted as the cathode, on one hand, the brass not only has excellent nitrate nitrogen reduction activity, but also has good corrosion resistance, the risk of the seepage of heavy metal ions such as copper ions and zinc ions can be effectively reduced, the occurrence of secondary pollution is prevented, and moreover, the brass is cheap and easy to obtain, and the early investment cost of electrochemical denitrification can be effectively reduced.
Drawings
FIG. 1 is a diagram illustrating an apparatus according to an embodiment of the present invention.
FIG. 2 is an enlarged view of the upper end part of the ammonia nitrogen recovery device in the embodiment of the invention.
FIG. 3 is a schematic diagram of a technique for electrochemically reducing nitran in an embodiment of the present invention.
FIG. 4 is a schematic diagram of ammonia nitrogen recovery technology in the embodiment of the present invention.
FIG. 5 is a scanning electron microscope image of polypropylene hydrophobic fiber membrane filaments used in the ammonia nitrogen recovery device in the embodiment of the invention. Wherein, the left figure is the cross section image of the polypropylene hydrophobic hollow fiber membrane silk, and the right figure is the inner surface image of the polypropylene hydrophobic hollow fiber membrane silk.
FIG. 6 is a graph showing changes in pH of wastewater in example 1.
Fig. 7 is a scanning electron microscope image of the brass net in example 2.
Wherein the reference numbers in the figures are:
the method comprises the following steps of 1-an electrolytic cell, 2-a cathode, 3-an anode, 4-a copper wire, 5-a power supply, 6-a first water pump, 7-an ammonia nitrogen recovery tank, 8-a first water inlet, 9-a hydrophobic hollow fiber membrane yarn, 10-a first water outlet, 11-a second water pump, 12-a liquid storage tank, 13-a second water inlet and 14-a second water outlet.
Detailed Description
The technical solutions of the present invention will be further described below with reference to preferred embodiments, but the technical contents of the present invention are not limited to the scope.
As shown in FIG. 1, the embodiment of the invention provides an electrochemical-ammonia nitrogen recovery combined system for efficiently treating industrial nitrogen-containing wastewater, which comprises an electrolysis device and an ammonia nitrogen recovery device, wherein:
the electrolytic device comprises an electrolytic cell 1 and a power supply 5, wherein the electrolytic cell 1 comprises a plurality of cathodes 2 and anodes 3 which are arranged in a staggered mode, and the cathodes 2 and the anodes 3 are respectively connected in series and then connected with the power supply 5;
the ammonia nitrogen recovery device comprises an ammonia nitrogen recovery tank 7 and an absorption liquid storage tank 12; the ammonia nitrogen recovery tank 7 comprises a shell and hydrophobic hollow fiber membrane filaments 9 which are arranged in the shell and are gathered into bundles;
a first water pump 6 is arranged between the electrolytic cell 1 and the ammonia nitrogen recovery tank 7, wastewater in the electrolytic cell 1 is introduced into the hydrophobic hollow fiber membrane filaments 9 of the ammonia nitrogen recovery tank 7 to flow, and then returns to the electrolytic cell 1 for circulation;
a second water pump 11 is arranged between the ammonia nitrogen recovery tank 7 and the liquid storage tank 12, and the absorption liquid in the liquid storage tank 12 is introduced to the outside of the hydrophobic hollow fiber membrane filaments 9 of the ammonia nitrogen recovery tank 7 to flow, then returns to the liquid storage tank 12, and circulates.
In one embodiment, as shown in fig. 2, the gaps between the hydrophobic hollow fiber membrane filaments 9 at the head and tail ends of the ammonia nitrogen recovery tank 7 and the gap between the hydrophobic hollow fiber membrane filament bundle and the shell of the ammonia nitrogen recovery tank 7 are sealed. In a preferred embodiment, the sealing process is filling the voids with an epoxy. After the gap between the hydrophobic fiber membrane tows and the shell is sealed, the hydrophobic fiber membrane tows can be tightly connected with the shell, and the hardened epoxy resin serves as a partition plate.
In one embodiment, the ammonia nitrogen recovery tank 7 is further provided with a first water inlet 8, a first water outlet 10, a second water inlet 13 and a second water outlet 14; wherein: the first water inlet 8 and the first water outlet 10 are communicated with the interior of the hydrophobic hollow fiber membrane yarn 9, and the first water pump 6 is connected with the first water inlet 8; the second water inlet 13 and the second water outlet 14 are communicated with the outside of the hydrophobic hollow fiber membrane wire 9, and the second water pump 11 is connected with the second water inlet 13.
In one embodiment, the cathode is brass and the anode is a dimensionally stable electrode.
In a preferred embodiment, the brass is a brass net, which is folded for use; the anode includes but is not limited to IrO 2 -RuO 2 Ti electrode and PbO 2 A Ti electrode.
In a preferred embodiment, the brass electrode has the following element composition: copper: 55 to 65 percent; zinc: 35 to 45 percent.
In one embodiment, the cathodes 2 and the anodes 3 are connected in series through copper wires 4 and are respectively connected to the negative electrode and the positive electrode of a power supply 5.
In one embodiment, the length of the shell of the ammonia nitrogen recovery tank 7 is 30-200 cm, and the diameter is 8-40 cm.
In one embodiment, the hydrophobic hollow fiber membrane filaments 9 include, but are not limited to, one of polypropylene, polytetrafluoroethylene, and polyvinyl chloride.
In one embodiment, the inner diameter of the hydrophobic hollow fiber membrane filament 9 is 0.2-1.5 mm. In a preferred embodiment, the outer diameter is 0.4 to 2 mm.
In one embodiment, the distance between the cathode and the anode is controlled to be 1-10 cm.
The following are specific examples:
the water quality of the industrial wastewater used in the following examples is shown in Table 1:
TABLE 1
| Initial pH value | 8.1 | Potassium ion (mg/L) | 5.9 |
| Ammonia nitrogen (mg/L) | 0.3 | Sulfate ion (mg/L) | 1049.8 |
| Nitrate nitrogen (mg/L) | 246.6 | Chloride ion (mg/L) | 102.1 |
| Sodium ion (mg/L) | 972.3 | Conductivity (mS/cm) | 2.43 |
Example 1
The device is shown in figure 1, and a brass plate is used as a cathode 2 in an electrolytic cell 1, and commercial IrO is 2 -RuO 2 the/Ti electrode is an anode 3, five cathode plates and anode plates are arranged in a staggered mode, and are respectively connected in series through copper leads 4 and are respectively connected to the negative pole and the positive pole of a power supply 5. As shown in fig. 3, under the condition of power supply, nitrate nitrogen in the wastewater is selectively reduced to ammonia nitrogen on the surface of the cathode, and simultaneously, the catalytic reaction consumes hydrogen ions in the water to generate hydroxide ions, so that the solution is strongly alkaline. When the power is on, the wastewater is pumped out of the electrolytic cell by a first water pump 6 and is pumped into an ammonia nitrogen recovery device 7 through a first water inlet 8, the wastewater flows inside hydrophobic hollow fiber membrane filaments 9 in the device and finally flows back to the electrolytic cell through a first water outlet 10; and pumping the absorption liquid out of the liquid storage tank 12 by using a second water pump 11, pumping the absorption liquid into the ammonia nitrogen recovery device through a second water inlet 13, enabling the absorption liquid to flow outside the hydrophobic hollow fiber membrane filaments, and finally flowing back to the liquid storage tank through a second water outlet 14. As shown in fig. 4, when the pH value of the wastewater rises, ammonia nitrogen is easily volatilized from the wastewater, permeates through the pipe wall of the hydrophobic hollow fiber membrane filament in the form of ammonia gas and is timely absorbed by the absorption liquid on the other side of the membrane filament, so that the ammonia nitrogen is prevented from being oxidized into nitrate nitrogen by the anode in the electrolytic cell, and finally, the removal efficiency of the nitrate nitrogen and the total nitrogen is improved, and the ammonia nitrogen is recycled. In addition, after the absorption liquid is dried and dehydrated, high-purity ammonium salt can be obtained, and the ammonium salt can be used as a nitrogen fertilizer.
Wherein:
brass plate, IrO 2 -RuO 2 The size of the electrode is 30cm × 12cm (length × width), the electrode water depth is 10cm, and the water inlet area of the cathode and anode is 0.3m 2 The ratio of the water inlet area is 1: 1.
The overall length of the appearance of the ammonia nitrogen recovery device is 50cm, and the diameter of the ammonia nitrogen recovery device is 10 cm.
The hydrophobic hollow fiber membrane yarn is made of polypropylene, and has an outer diameter of 0.5mm, an inner diameter of 0.4mm and a length of 40 cm. The scanning electron microscope image thereof is shown in fig. 5.
The absorption liquid is prepared by diluting concentrated sulfuric acid, and the concentration of hydrogen ions is 1 mol/L.
And adding waste water into the electrolytic cell, wherein the volume of the waste water is 7L, and the volume of the absorption liquid in the liquid storage tank is 2L. The flow rates of the water pumps 1 and 2 were set to 40L/h. Starting a direct current power supply, and setting the cathode current density to be 5mA/cm 2 . The electrolysis time is 5h, and the electrolysis time is consistent with the ammonia nitrogen recovery time.
The total nitrogen content of the wastewater and the nitrogen content of the absorbed liquid ammonia after the treatment by the method are shown in Table 2.
TABLE 2
The recovery rate of nitrogen element is the ammonia nitrogen quality of absorption liquid/the total nitrogen quality of wastewater
Ammonia nitrogen recovery selectivity is equal to ammonia nitrogen quality of absorption liquid/total nitrogen quality of absorption liquid
The results show that the device and the total nitrogen treatment method provided by the invention can be used for treating the total nitrogen of the industrial wastewater, can effectively reduce the total nitrogen index of the wastewater, have obvious effect and can realize standard discharge of the treated water.
The wastewater pH changes are shown in figure 6.
As can be seen from FIG. 6, the pH of the wastewater rapidly increased as the reduction of the nitrate nitrogen occurred. The strong alkaline environment of the solution is beneficial to the volatilization of ammonia nitrogen, thereby accelerating the recovery rate of ammonia nitrogen.
Comparative example 1
In order to further embody the important function of the ammonia nitrogen recovery device in the whole wastewater denitrification treatment process, the wastewater is treated by two steps: firstly, carrying out independent electrolytic treatment on the wastewater, and introducing the wastewater into an ammonia nitrogen recovery device for deamination treatment after the electrolytic process is finished.
And adding waste water into the electrolytic cell, wherein the volume of the waste water is 7L, and the volume of the absorption liquid in the liquid storage tank is 2L. The first step of electrolysis process: starting a direct current power supply, and setting the cathode current density to be 5mA/cm 2 The electrolysis time is 5 h. The second step of ammonia nitrogen recovery process: after the electrolysis process is finished, the flow rates of the water pumps 1 and 2 are set to be 40L/h, and the ammonia nitrogen recovery time is 5 h.
After the first step of electrolysis process, the contents of nitrate nitrogen, ammonia nitrogen and total nitrogen in the wastewater are shown in Table 3.
TABLE 3
After the ammonia nitrogen recovery process of the second step is finished, the residual total nitrogen content of the wastewater and the ammonia nitrogen content of the absorption liquid are shown in table 4.
TABLE 4
The results show that the electrolytic cell is independently adopted to treat the wastewater, although most of nitrate nitrogen can be reduced into ammonia nitrogen, compared with the electrolytic cell and an ammonia nitrogen recovery device which are jointly used to treat the wastewater, the nitrate nitrogen reduction rate is obviously reduced. The treatment time is prolonged due to the step-by-step treatment, so that part of ammonia nitrogen is volatilized into the air, the treatment time cost is increased, and the recovery rate of nitrogen elements is obviously reduced.
Comparing the results of total nitrogen removal rate and nitrogen element recovery rate of example 1 and comparative example 1, it can be found that the ammonia nitrogen recovery device has obvious promotion effect on the nitrate nitrogen reduction reaction in the electrolytic cell, can improve the reduction rate of nitrate nitrogen, reduce the risk that the resultant ammonia nitrogen is oxidized back to nitrate nitrogen again by the anode, improve the utilization rate of electric energy, save the treatment time cost of waste water, improve the recovery rate of nitrogen element and recover the direct economic benefits that the ammonia nitrogen produced.
Example 2
Considering that the cathode reaction only occurs on the surface of the electrode, the brass net is used to replace the brass plate, so that the consumption of brass can be reduced, and the cost of the electrode can be saved. On the other hand, the brass net can be folded, the reduction reaction of nitrate nitrogen cannot be influenced when the brass net is folded for use, the electrode area (specific electrode area) in unit volume can be increased, and the wastewater treatment efficiency is favorably improved.
In this example, the brass mesh model parameter used: h65 type (copper content: 65%, zinc content: 35%); pore size (mesh): 80 meshes; and (3) wire diameter: 0.12 mm. A scanning electron microscope image of the brass mesh is shown in fig. 7.
A cut brass net having an original size of 30cm × 60cm (length × width) was prepared, and folded four times in a size of 30cm × 12cm (length × width). The depth of water entry is 10cm, so that the water entry (geometric) area of the whole brass net is 0.3m 2 . Five folded brass mesh electrodes were prepared, with a cathode/anode water inlet area ratio of 5:1, and the cathode/anode water inlet area ratios of only 1:1 in examples 1 and 2.
And adding waste water into the electrolytic cell, wherein the volume of the waste water is 7L, and the volume of the absorption liquid in the liquid storage tank is 2L. The flow rates of the water pumps 1 and 2 were set to 40L/h. Starting a direct current power supply, and setting the cathode current density to be 2.5mA/cm 2 . The electrolysis time is 3h, and the electrolysis time is consistent with the ammonia nitrogen recovery time.
In this example, the other operating conditions were identical to those of example 1.
The total nitrogen content of the wastewater and the nitrogen content of the absorbed liquid ammonia after the treatment by the method are shown in Table 5.
TABLE 5
After the brass plate is replaced by the brass net, the electrode area of the cathode in unit volume is obviously increased, the reduction rate of the nitrate nitrogen is favorably improved, and the time required for removing the total nitrogen is shortened.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications may be made by those skilled in the art without departing from the principles of the invention and these modifications should also be considered as falling within the scope of the invention.
Claims (10)
1. The utility model provides an electrochemistry-ammonia nitrogen recovery combination system of high-efficient processing industry nitrogenous waste water which characterized in that, includes electrolytic device and ammonia nitrogen recovery unit, wherein:
the electrolysis device comprises an electrolysis cell and a power supply, wherein the electrolysis cell comprises a plurality of cathodes and anodes which are arranged in a staggered mode, and the cathodes and the anodes are connected in series respectively and then are connected with the power supply;
the ammonia nitrogen recovery device comprises an ammonia nitrogen recovery tank and an absorption liquid storage tank; the ammonia nitrogen recovery tank comprises a shell and hydrophobic hollow fiber membrane filaments which are arranged in the shell and are gathered into bundles;
a first water pump is arranged between the electrolytic cell and the ammonia nitrogen recovery tank, wastewater in the electrolytic cell is introduced into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank to flow, and then the wastewater returns to the electrolytic cell and circulates;
and a second water pump is arranged between the ammonia nitrogen recovery tank and the liquid storage tank, and the absorption liquid in the liquid storage tank is introduced into the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank to flow outside, then returns to the liquid storage tank and circulates.
2. The system according to claim 1, wherein the gaps between the hydrophobic hollow fiber membrane filaments at the head end and the tail end of the ammonia nitrogen recovery tank and the gap between the hydrophobic hollow fiber membrane filament bundle and the shell of the ammonia nitrogen recovery tank are sealed.
3. The system according to claim 1, wherein the ammonia nitrogen recovery tank is further provided with a first water inlet, a first water outlet, a second water inlet and a second water outlet; wherein: the first water inlet and the first water outlet are communicated with the interior of the hydrophobic hollow fiber membrane yarn, and the first water pump is connected with the first water inlet; the second water inlet and the second water outlet are communicated with the outside of the hydrophobic hollow fiber membrane yarn, and the second water pump is connected with the second water inlet.
4. The system of claim 1, wherein the cathode is brass and the anode is a dimensionally stable electrode.
5. The system according to claim 1, wherein the ammonia nitrogen recovery tank shell has a length of 30-200 cm and a diameter of 8-40 cm; the inner diameter of the hydrophobic hollow fiber membrane wire is 0.2-1.5 mm; the hydrophobic hollow fiber membrane yarn is made of one of polypropylene, polytetrafluoroethylene and polyvinyl chloride; the distance between the cathode and the anode is controlled to be 1-10 cm.
6. The application of the electrochemical-ammonia nitrogen recovery combined system for efficiently treating the industrial nitrogen-containing wastewater, which is disclosed by any one of claims 1 to 5, in treating the industrial nitrogen-containing wastewater.
7. A process for efficiently treating industrial nitrogen-containing wastewater, which is characterized in that the electrochemical-ammonia nitrogen recovery combined system of any one of claims 1-5 is adopted, and the process specifically comprises the following steps:
1) adding industrial nitrogen-containing wastewater into an electrolytic cell, and adding an absorption liquid into a liquid storage tank;
2) electrifying for electrolysis, simultaneously introducing the wastewater in the electrolytic cell into an ammonia nitrogen recovery tank, flowing in the hydrophobic hollow fiber membrane filaments, and finally returning to the electrolytic cell for circulation; synchronously introducing the absorption liquid in the liquid storage tank into the ammonia nitrogen recovery tank, flowing outside the hydrophobic hollow fiber membrane filaments, finally returning to the liquid storage tank, and circulating;
3) and monitoring the nitrogen content of the wastewater in the electrolytic cell, and finishing the treatment process when the effluent index is met.
8. The process according to claim 7, wherein in the step 1), the absorption solution is an aqueous solution of sulfuric acid or hydrochloric acid, and the concentration of the aqueous solution is 0.1-10 mol/L.
9. The process according to claim 7, wherein in the step 2), the current density during the electrolysis reaction is 0.5 to 20mA/cm 2 (ii) a During electrolysis, the flow speed of the wastewater in the hydrophobic hollow fiber membrane filaments is 5-100L/h; the flowing speed of the absorption liquid outside the hydrophobic hollow fiber membrane filaments is 5-100L/h.
10. The process according to claim 7, wherein in the step 2), the wastewater in the electrolytic cell is introduced into the interior of the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank through a first water pump; and the absorption liquid in the liquid storage tank is led into the outside of the hydrophobic hollow fiber membrane filaments of the ammonia nitrogen recovery tank through a second water pump.
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