CN216155549U - Tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor - Google Patents
Tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor Download PDFInfo
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- CN216155549U CN216155549U CN202121795308.1U CN202121795308U CN216155549U CN 216155549 U CN216155549 U CN 216155549U CN 202121795308 U CN202121795308 U CN 202121795308U CN 216155549 U CN216155549 U CN 216155549U
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Abstract
The utility model discloses a tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor. The device comprises a Venturi ejector, a gas-liquid separation device and an electrolytic bath, wherein the Venturi ejector, the gas-liquid separation device and the electrolytic bath are sequentially connected and arranged; the water inlet of the Venturi ejector receives ammonia nitrogen wastewater, and the Venturi ejector is VenturiThe water outlet of the venturi ejector is connected with the water inlet of the gas-liquid separation device, the water outlet of the gas-liquid separation device is connected with the water inlet of the electrolytic cell, purified waste water is discharged from the water outlet of the electrolytic cell, the top of the electrolytic cell is provided with an air suction port, a negative pressure rapid flow section of the venturi ejector is provided with a venturi ejector air inlet, and the air suction port is communicated with the venturi ejector air inlet. The utility model is used for electrochemical treatment of ammonia nitrogen wastewater, can circularly reflux the gas generated by the electrolytic reaction without a fan, solves the problem of discharge of toxic and irritant gases, and simultaneously recovers Cl2Continuously participate in the oxidation reaction, improve the oxidation efficiency of ammonia nitrogen and reduce energy consumption.
Description
Technical Field
The utility model belongs to an electrochemical reactor in the field of electrochemical treatment of wastewater, and particularly relates to a tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor.
Background
The treatment method of the ammonia nitrogen wastewater comprises a nitrification-denitrification method, an ammonia stripping method, an ion exchange method, a breakpoint chlorination method, a precipitation method, an electrochemical method and the like. The electrochemical method for removing ammonia nitrogen has the advantages of high removal efficiency, simple device, small occupied area and the like, and is widely concerned and researched. However, compared with the traditional treatment processes such as nitrification-denitrification, the electrochemical oxidation method has higher energy consumption and increased cost.
The electrochemical removal mechanism of ammonia nitrogen is divided into two types: direct oxidation and indirect oxidation. Under the condition of the existence of chloride ions, ammonia nitrogen is mainly removed by indirect oxidation, namely ClO is obtained by chloride ion electrolysis-、Cl2And (5) reacting the strong oxidizing products with ammonia nitrogen to remove the ammonia nitrogen. Cl2Is a toxic gas with pungent odor, so that Cl may be generated in the process of electrochemically treating ammonia nitrogen2Escape (Cl may occur during electrochemical treatment of ammonia nitrogen)2Escape condition), generate unpleasant odors and pose a hazard to environmental safety.
SUMMERY OF THE UTILITY MODEL
The utility model provides a tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor, aiming at solving the problems of toxic and pungent gas emission, ammonia nitrogen removal efficiency and high energy consumption of the ammonia nitrogen electrochemical reactor in the background technology.
In order to achieve the purpose, the utility model adopts the technical scheme that:
the utility model comprises a Venturi ejector, a gas-liquid separation device and an electrolytic bath, wherein the Venturi ejector, the gas-liquid separation device and the electrolytic bath are sequentially connected and arranged; the ammonia nitrogen waste water is received to venturi ejector water inlet, and venturi ejector delivery port and gas-liquid separation device water inlet are connected, and gas-liquid separation device delivery port and electrolysis trough water inlet are connected, and the waste water after the electrolysis trough delivery port discharge purifies, and the electrolysis trough top is equipped with the extraction opening, and venturi ejector's negative pressure torrent section is equipped with venturi ejector air inlet, extraction opening and venturi ejector air inlet intercommunication.
The gas-liquid separation device in be equipped with gas dispersion device and baffle, gas dispersion device is located gas-liquid separation device water inlet department, the bottom in the gas-liquid separation device is equipped with the baffle, the height that highly is less than gas-liquid separation device of baffle, divide into two sub-chambeies with the gas-liquid separation device inner chamber through the baffle, two sub-chambeies are each other not linked together at the gas-liquid separation device bottom, a sub-chamber and gas-liquid separation device water inlet intercommunication, another sub-chamber and gas-liquid separation device delivery port intercommunication, the sub-chamber of gas-liquid separation device water inlet intercommunication is equipped with gas dispersion device.
The electrolytic cell includes an electrolytic cell outer shell and an electrolytic cell electrode assembly within the electrolytic cell outer shell.
In the electrolytic cell electrode assembly, a corrosion-resistant electrode is adopted as a cathode electrode, and a chlorine evolution type electrode with stable shape is adopted as an anode electrode.
The electrochemical reactor is used for treating ammonia nitrogen wastewater containing chloride ions.
The utility model is suitable for treating ammonia nitrogen wastewater containing chloride ions.
The utility model has the beneficial effects that:
the utility model arranges the Venturi ejector and the gas-liquid separation device in front of the electrolytic cell, does not need to additionally use a fan, and utilizes the jet flow negative pressure principle of the Venturi ejector to electrolyze H generated in the electrolytic cell2、Cl2、O2After being circulated and returned, the gas is absorbed and purified by a gas-liquid separation device and then discharged, so that the gas Cl with toxic and pungent odor is avoided2Escape, reducing the risk of environmental hazard; second, Cl is realized2The reabsorption of the ammonia nitrogen improves the oxidation removal efficiency of the ammonia nitrogen and reduces the energy consumption.
Meanwhile, a fan does not need to be additionally arranged, and equipment and power cost can be reduced.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a comparative example of an embodiment of the present invention.
Fig. 3 is a structural view of a conventional device for reflow-free open operation.
In the figure: the device comprises a Venturi ejector 1, a gas-liquid separation device 2, an electrolytic bath 3, a Venturi ejector water inlet 4, a Venturi ejector water outlet 5 and a Venturi ejector air inlet 6; a gas-liquid separation device water inlet 7, a gas dispersion device 8, a clapboard 9, a gas-liquid separation device water outlet 10, an electrolytic cell outer shell 11, an electrolytic cell electrode assembly 12, an electrolytic cell water inlet 13, an electrolytic cell water outlet 14 and an air extraction opening 15.
Detailed Description
The present invention will now be described in detail with reference to the drawings, but the utility model is not limited thereto.
As shown in fig. 1, the reactor comprises a venturi ejector 1, a gas-liquid separation device 2 and an electrolytic bath 3, wherein the venturi ejector 1, the gas-liquid separation device 2 and the electrolytic bath 3 are sequentially connected and arranged; the ammonia nitrogen waste water is received to venturi ejector water inlet 4, and venturi ejector delivery port 5 and gas-liquid separation device water inlet 7 are connected, and gas-liquid separation device delivery port 10 and electrolysis trough water inlet 13 are connected, and the waste water after the electrolysis trough delivery port 14 discharge purifies, and 3 tops of electrolysis trough are equipped with extraction opening 15, and venturi ejector 1's negative pressure torrent section is equipped with venturi ejector air inlet 6, and extraction opening 15 and venturi ejector air inlet 6 communicate.
The Venturi ejector is mainly used for air extraction, gas-liquid mixing and tail gas absorption, the gas-liquid separation device is mainly used for gas-liquid separation and tail gas further absorption, and the electrolytic bath is used for electrochemical reaction.
In concrete implementation, be equipped with gas dispersion devices 8 and baffle 9 in the gas-liquid separation device 2, gas dispersion devices 8 are located gas-liquid separation device 2's water inlet 7 department, bottom in the gas-liquid separation device 2 is equipped with baffle 9, baffle 9 highly is less than gas-liquid separation device 2 device height, divide into two sub-rooms with 2 inner chambers of gas-liquid separation device through baffle 9, two sub-rooms are not communicated each other in gas-liquid separation device 2 bottom, a sub-room and gas-liquid separation device water inlet 7 intercommunication, another sub-room and gas-liquid separation device go out waterThe port 10 is communicated with the gas-liquid separation device, and a gas dispersion device 8 is arranged in the sub-cavity communicated with the water inlet 7 of the gas-liquid separation device. The gas dispersing device 8 is used for uniformly dispersing gas entering the gas-liquid separation device 2 so as to enable Cl2Is absorbed sufficiently. The water inlet 7 of the gas-liquid separation device and the water outlet 10 of the gas-liquid separation device are both lower than the upper edge of the partition plate 9, so that the two sub cavities are communicated with each other through the overflow partition plate 9.
In particular implementation, the electrolytic cell 3 includes an electrolytic cell outer case 11 and an electrolytic cell electrode assembly 12 within the electrolytic cell outer case 11. The electrolytic cell electrode assembly 12 includes a cathode electrode and an anode electrode, the cathode electrode is a corrosion-resistant electrode, and the anode electrode is a chlorine evolution type shape-stable electrode. The cathode and anode can be Ti/RuO2-IrO2-RhOxAnd an electrode.
The working process and principle of the utility model in practical application are as follows:
under the initial condition, the electrolyte as ammonia nitrogen wastewater flows in through a water inlet 4 of the venturi ejector and flows out of a water outlet 5 of the venturi ejector, and the ammonia nitrogen wastewater passes through the gas-liquid separation device 2 and leads to the electrolytic tank 3. When passing through the gas-liquid separation device 2, the electrolyte in the sub-chamber provided with the gas dispersion device 8 overflows over the partition plate 9 into the sub-chamber not provided with the gas dispersion device 8.
Production of Cl from electrolysis of electrolyte waste water by electrolytic cell2、ClO-Ammonia nitrogen is iso-oxidized and is accompanied by H2、Cl2And a small amount of O2The generated gas is pumped from the air pumping hole 15 of the electrolytic bath to the air inlet 6 of the venturi ejector according to the negative pressure principle of the venturi ejector, is mixed with the wastewater at the negative pressure rapid flow section of the venturi ejector 6 and is absorbed, and then is conveyed into the gas-liquid separation device 2.
In the gas-liquid separation device 2, the gas-liquid separation device firstly enters a sub-cavity provided with a gas dispersion device 8, so that H2、Cl2And O2After the gas is uniformly dispersed and purified, H2And O2Can not be absorbed and discharged, Cl2The ammonia nitrogen in the electrolyte is further fully absorbed and oxidized, and the electrolyte overflows to the electrolytic cell through the partition plate.
To this end, toxic and irritant effects are achievedTail gas Cl of sexual odor2The absorption and the recycling of the blower-free device solve the problem of tail gas environmental risk, and the oxidation is carried out in advance so as to be convenient for secondary electrolysis, improve the ammonia nitrogen oxidation efficiency and reduce the energy consumption.
The examples of the utility model are as follows:
electrolysis conditions of Cl-Concentration 6000mg/L, NH3The concentration of-N is 400mg/L, and the current density is 1000A/m2And respectively testing the actual ammonia nitrogen removal effect and influence of the traditional non-reflux open type electrolysis and the reflux type electrolysis. The results are shown in FIG. 2.
The processing apparatus of the conventional non-reflow opening type operation is shown in fig. 3, and the non-reflow opening type operation is performed.
After 2.5h of non-reflux open type operation electrolysis, the ammonia nitrogen concentration is reduced from 400mg/L to 301mg/L, the degradation rate is 22.5%, and the voltage is increased from 5.62V to 6.10V in the electrolysis process.
After the utility model is treated and electrolyzed for 2.5h, the concentration of the reflux electrolytic ammonia nitrogen is reduced from 400mg/L to 280mg/L, the degradation rate is 30 percent, and the voltage is increased from 5.12V to 5.26V in the electrolysis process.
Therefore, compared with the prior art, the ammonia nitrogen degradation efficiency is improved by 7.5% and the average energy consumption is reduced by about 11% under the same test condition. Meanwhile, in the traditional non-backflow open type operation process, obvious pungent smell is generated; the reflux operation of the present invention has no obvious smell.
The implementation shows that the device has simple structure, can be used for performing electrochemical treatment on ammonia nitrogen wastewater, is provided with the air extraction opening in the electrolytic cell, is provided with the Venturi ejector and the gas-liquid separation device at the front end, and can be used for treating Cl generated by electrolytic reaction without a fan2、H2、O2The equal circulation backflow solves the problem of gas emission with toxic and pungent odor, and simultaneously recovers Cl2Continuously participate in the oxidation reaction, further improving the oxidation efficiency of ammonia nitrogen and reducing energy consumption; the installation mode of the electrode assembly in the electrolytic cell is flexible, and the electrode assembly can be adjusted according to actual needs, so that the practical application adaptability is strong.
Claims (5)
1. Tail gas backward flow formula ammonia nitrogen waste water treatment electrochemical reactor, its characterized in that: the device comprises a Venturi ejector (1), a gas-liquid separation device (2) and an electrolytic bath (3), wherein the Venturi ejector (1), the gas-liquid separation device (2) and the electrolytic bath (3) are sequentially connected and arranged; ammonia nitrogen wastewater is received in venturi ejector water inlet (4), venturi ejector delivery port (5) and gas-liquid separation device water inlet (7) are connected, gas-liquid separation device delivery port (10) and electrolysis trough water inlet (13) are connected, the waste water after electrolysis trough delivery port (14) discharge purifies, electrolysis trough (3) top is equipped with extraction opening (15), the negative pressure torrent section of venturi ejector (1) is equipped with venturi ejector air inlet (6), extraction opening (15) and venturi ejector air inlet (6) intercommunication.
2. The tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor of claim 1, which is characterized in that: gas-liquid separation device (2) in be equipped with gas dispersion device (8) and baffle (9), gas dispersion device (8) are located gas-liquid separation device water inlet (7) department, the bottom in gas-liquid separation device (2) is equipped with baffle (9), the height that highly is less than gas-liquid separation device (2) of baffle (9), divide into two sub-rooms with gas-liquid separation device (2) inner chamber through baffle (9), two sub-rooms do not communicate each other in gas-liquid separation device (2) bottom, a sub-room and gas-liquid separation device water inlet (7) intercommunication, another sub-room and gas-liquid separation device delivery port (10) intercommunication, gas dispersion device (8) are equipped with in the sub-room of gas-liquid separation device water inlet (7) intercommunication.
3. The tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor of claim 1, which is characterized in that: the electrolytic cell (3) comprises an electrolytic cell outer shell (11) and an electrolytic cell electrode assembly (12) in the electrolytic cell outer shell (11).
4. The tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor of claim 3, which is characterized in that: in the electrolytic cell electrode assembly (12), a corrosion-resistant electrode is adopted as a cathode electrode, and a chlorine evolution type electrode with stable shape is adopted as an anode electrode.
5. The tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor of claim 1, which is characterized in that: the electrochemical reactor is used for treating ammonia nitrogen wastewater containing chloride ions.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113896288A (en) * | 2021-08-03 | 2022-01-07 | 浙江大学 | Tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113896288A (en) * | 2021-08-03 | 2022-01-07 | 浙江大学 | Tail gas reflux type ammonia nitrogen wastewater treatment electrochemical reactor |
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