CN215249796U - Device for pretreating pyridine wastewater by using composite nano zero-valent iron material - Google Patents
Device for pretreating pyridine wastewater by using composite nano zero-valent iron material Download PDFInfo
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- CN215249796U CN215249796U CN202121054208.3U CN202121054208U CN215249796U CN 215249796 U CN215249796 U CN 215249796U CN 202121054208 U CN202121054208 U CN 202121054208U CN 215249796 U CN215249796 U CN 215249796U
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Abstract
The utility model discloses a compound nanometer zero-valent iron material preliminary treatment pyridine class effluent plant, this effluent plant includes: the device comprises a nano zero-valent iron synthesis tank, a solid-liquid separation tank, a wastewater reaction tank, a Fenton pool and a sedimentation tank which are sequentially communicated; the wastewater reaction tank comprises an inclined tube settling zone, a mixed reaction zone, a compact reaction zone and a porous supporting layer which are arranged in sequence; the Fenton pool comprises an acid regulation area, a Fenton reaction area and an alkali regulation area which are sequentially communicated. The utility model can rapidly and conveniently manufacture the nanometer zero-valent iron on site, avoid the oxidation of the nanometer zero-valent iron during dry transportation, wet addition of the nanometer zero-valent iron, isolate air contact to a certain extent, ensure the effectiveness of the nanometer zero-valent iron, and has the characteristics of better oxidation reduction property, lower oxidation degree, higher utilization rate and the like; the whole system has simple structure, convenient operation and maintenance, low cost and more flexibility compared with the conventional advanced oxidation technology.
Description
Technical Field
The utility model relates to a waste water treatment technical field, in particular to compound nanometer zero-valent iron material preliminary treatment pyridine class waste water device.
Background
Pyridine-based derivative pesticide products mainly include clopyralid, tetrachloropicolinic acid, pentachloropyridine, 2, 3, 5, 6-tetrachloropyridinethiol and other chemical products. The pyridine pesticide has a complex production process, relates to processes of chlorination substitution, hydrolysis and carboxyl addition, esterification and the like, leads chemical substances contained in the wastewater to be complex, and has the following characteristics: (1) the concentration of organic pollutants is high; (2) the components of the wastewater are complex; (3) most of the wastewater has high toxicity, inhibits the activity of microorganisms and is difficult to degrade biochemically. And the substances such as chloride ions, chloropyridine, chlorinated pyridine-containing fatty acid and the like are also more, so that the effects of advanced oxidation processes such as ozone and Fenton are poor, the wastewater cannot be treated well, and the environmental pollution is caused.
The aromatic heterocyclic ring of the pyridine derivative is stable, the pyridine heterocyclic ring concentration is difficult to be reflected by conventional COD detection means such as a potassium dichromate method, the pyridine derivative concentration cannot be effectively reflected by a gas chromatography national standard method only by a pyridine content detection method, the organic matter concentration cannot be judged by a COD index, and the treatment difficulty is increased. The prior treatment process of the pyridine derivatives mainly comprises an advanced oxidation method, a physical method, a biological method and a combination method of the three methods. Advanced oxidation methods include wet oxidation, Fenton oxidation, ozone oxidation, electrocatalytic oxidation and other treatment methods; the physical method for treating the pesticide wastewater comprises an adsorption method, a stripping method, a distillation method, a precipitation method and the like; the key of the biological treatment technology is to screen out specific degrading bacteria aiming at heterocyclic organic pollutants in the wastewater or develop a new technology and a new process which are combined into a whole by a plurality of technologies. The prior chemical method, physical method and biological method heterocyclic pesticide wastewater treatment technologies have respective advantages and limitations. In the practical treatment of heterocyclic pesticide wastewater, the organic pollutants in the water are complex and various, and the standard emission is difficult to achieve by using a single process for treatment.
SUMMERY OF THE UTILITY MODEL
To the problem that prior art exists, the utility model provides a compound nanometer zero-valent iron material preliminary treatment pyridine waste water device.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
a device for pretreating pyridine wastewater by using a composite nano zero-valent iron material comprises: the device comprises a nano zero-valent iron synthesis tank, a solid-liquid separation tank, a wastewater reaction tank, a Fenton pool and a sedimentation tank which are sequentially communicated; the wastewater reaction tank comprises an inclined tube settling zone, a mixed reaction zone, a compact reaction zone and a porous supporting layer which are arranged in sequence; the Fenton pool comprises an acid regulation area, a Fenton reaction area and an alkali regulation area which are sequentially communicated.
Preferably, the nano zero-valent iron synthesis tank comprises a tank body, and a ferrous ion dosing port, a potassium borohydride dosing port, a nitrogen gas inlet, a first gas discharge port, a first stirrer, a first pressure gauge, a first loading and unloading port, a backflow port, a first water outlet pipe and a backflow pipe which are arranged on the tank body.
Preferably, the first stirrer head is arranged at the top of the tank body, and the stirring part is arranged in the tank body in a penetrating way; the first gas discharge port is arranged on one side of the first stirrer, and the first pressure gauge is arranged on the other side of the first stirrer; the ferrous ion dosing port, the potassium borohydride dosing port and the nitrogen gas inlet are correspondingly arranged on one side of the tank body; the first loading and unloading material port and the backflow port are correspondingly arranged on the other side of the tank body; the first water outlet is arranged at the bottom of the tank body; one end of the first water outlet pipe is connected with the first water outlet, and the other end of the first water outlet pipe is connected with the solid-liquid separation tank; one end of the backflow pipe is connected with the backflow port, and the other end of the backflow pipe is connected with the solid-liquid separation tank.
Preferably, the solid-liquid separation tank comprises a second tank body, a liquid inlet, a second gas discharge port, a second water outlet and a drain pipe which are arranged on the second tank body, and a tee joint arranged on the second water outlet; the second gas discharge port is arranged at the top of the second tank body; the liquid inlet is arranged on the upper side of the second tank body; the second water outlet is arranged at the bottom of the tank body; the other end of the first water outlet pipe is connected with a liquid inlet of the solid-liquid separation tank; the other end of the return pipe is connected with one end of a tee joint of the solid-liquid separation tank; one end of the water discharge pipe is connected with the other end of the tee joint.
Preferably, the wastewater reaction tank comprises a third tank body, a standby water outlet, a third gas discharge port, a second pressure gauge, a third water outlet, a second water outlet pipe connected with the third water outlet, two second loading and unloading ports, two backflow pipelines, a composite zero-valent iron material discharge port and a wastewater inlet, wherein the standby water outlet, the third gas discharge port, the second pressure gauge and the third water outlet are arranged on the third tank body.
Preferably, the standby water outlet, the third gas discharge port and the second pressure gauge are all arranged at the top of the tank body, the third gas discharge port is arranged on one side of the standby water outlet, and the second pressure gauge is arranged on the other side of the standby water outlet; the third water outlet is arranged on the upper side of the tank body and is arranged above the inclined tube settling zone; the composite zero-valent iron material discharge inlet is connected with the other end of the drain pipe of the solid-liquid separation tank, and is arranged at one side of the compact reaction zone; the two loading and unloading material ports and the two backflow pipelines are arranged in a staggered mode; the two loading and unloading materials are arranged on the other side of the compaction reaction area; one of the two backflow pipelines is arranged at the other side of the compact reaction zone, and the other backflow pipeline is arranged below the porous supporting layer; the waste water inlet is arranged at the bottom of the tank body, one side of the waste water inlet is provided with a vent, and the water inlet end of the waste water inlet is connected with a waste water inlet pipe.
Preferably, the acid adjusting zone, the fenton reaction zone and the alkali adjusting zone are respectively and correspondingly provided with a second stirrer, a third stirrer and a fourth stirrer.
Adopt the technical scheme of the utility model, following beneficial effect has: the device can be used for treating pyridine wastewater, can degrade pyridine derivatives which are difficult to degrade in the common process, reduce biotoxicity, remove or decompose most of undetected COD (chemical oxygen demand) parts, improve biodegradability, prevent pyridine organic matters from being enriched in activated sludge in long-term operation, and ensure that the treatment reaches the standard; the tower type contact reaction tower utilizes the material gravity characteristic in hydromechanics, and is provided with an inclined tube settling zone, a mixed reaction zone, a compact reaction zone, a backflow pipeline and the like, so that the contact space between a water body and the material is promoted, and the material is intercepted in the reaction zone.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the nano zero-valent iron synthesis tank and the solid-liquid separation tank of the present invention;
FIG. 3 is a schematic view of the wastewater reaction tank of the present invention;
fig. 4 is the structure schematic diagram of the fenton pool and the sedimentation tank of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "is connected to" the second feature
"under" may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact, but being in contact with each other through additional features between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1 to 4, the utility model provides a compound nanometer zero-valent iron material preliminary treatment pyridine waste water device, includes: a nano zero-valent iron synthesis tank I, a solid-liquid separation tank II, a wastewater reaction tank III, a Fenton tank IV and a sedimentation tank IV which are communicated in sequence; the wastewater reaction tank III comprises an inclined tube settling zone 11, a mixed reaction zone 12, a compact reaction zone 13 and a porous supporting layer 20 which are arranged in sequence; the Fenton pool comprises an acid regulation area 17, a Fenton reaction area 18 and an alkali regulation area 19 which are communicated in sequence.
The nano zero-valent iron synthesis tank I comprises a tank body, a ferrous ion dosing port 1, a potassium borohydride dosing port 2, a nitrogen gas inlet 3, a first gas discharge port 4, a first stirrer 5, a first pressure gauge 6, a first loading and unloading port 7, a backflow port 8, a first water outlet 9, a first water outlet pipe 901 and a backflow pipe 801, wherein the ferrous ion dosing port 1, the potassium borohydride dosing port 2, the nitrogen gas inlet 3, the first gas discharge port 4, the first stirrer 5, the first pressure gauge 6, the first loading and unloading port, the backflow port and the backflow pipe are arranged on the tank body;
the head of the first stirrer 5 is arranged at the top of the tank body, and the stirring part is arranged in the tank body in a penetrating way; the first gas discharge port 4 is arranged on one side of the first stirrer 5, and the first pressure gauge 6 is arranged on the other side of the first stirrer; the ferrous ion dosing port 1, the potassium borohydride dosing port 2 and the nitrogen gas inlet 3 are correspondingly arranged on one side of the tank body; the first loading and unloading material port 7 and the return port 8 are correspondingly arranged on the other side of the tank body; the first water outlet 9 is arranged at the bottom of the tank body; one end of the first water outlet pipe 901 is connected with the first water outlet 9, and the other end of the first water outlet pipe is connected with the solid-liquid separation tank II; one end of the return pipe 801 is connected with the return port 8, and the other end of the return pipe is connected with the solid-liquid separation tank II.
When the nano zero-valent iron synthesis tank I works in the embodiment, nitrogen is firstly discharged through a nitrogen inlet to isolate the influence of oxygen in the air, then a biochar-nickel material is put into the tank body through a loading and unloading port, ferrous ions are put into the tank body from a dosing port through a peristaltic pump, the mixture is fully mixed and stirred for more than 30min, then prepared potassium borohydride is slowly dripped through a potassium borohydride dosing port to be dissolved, the reaction is carried out for more than 30min after the dripping is finished, nitrogen is slowly discharged in the whole synthesis process all the time, and a stirrer is used for stirring in the reaction process all the time. And after the reaction is finished, discharging a solid-liquid mixture to a solid-liquid separation tank II through a first water outlet 9, standing for more than 30min, controlling by a lower valve (arranged on a water outlet pipe), enabling the solid composite nano material to enter a wastewater reaction tank III, recycling the liquid containing ferrous ions, refluxing to a nano zero-valent iron synthesis tank I, and carrying out synthesis in the next period.
The solid-liquid separation tank II comprises a second tank body, a liquid inlet 50, a second gas discharge port 40, a second water outlet 95, a water discharge pipe 211 and a tee 35, wherein the liquid inlet 50, the second gas discharge port 40, the second water outlet 95 and the water discharge pipe 211 are arranged on the second tank body; the second gas discharge port 40 is arranged at the top of the second tank body; the liquid inlet 50 is arranged at the upper side of the second tank body; the second water outlet 95 is arranged at the bottom of the tank body; the other end of the first water outlet pipe 901 is connected with a liquid inlet 50 of the solid-liquid separation tank; the other end of the return pipe 801 is connected with one end of a tee 35 of the solid-liquid separation tank II; and one end of a drain pipe 211 of the solid-liquid separation tank II is connected with the other end of the tee joint 35.
The wastewater reaction tank III comprises a third tank body, a standby water outlet 10, a third gas discharge port 400, a second pressure gauge 60, a third water outlet 90, a second water outlet pipe 902 connected with the third water outlet 90, two second loading and unloading ports 70, a two-reflux pipeline 14, a composite zero-valent iron material discharge port 21 and a wastewater inlet 15, wherein the standby water outlet 10, the third gas discharge port 400, the second pressure gauge 60 and the third water outlet 90 are arranged on the third tank body; the spare water outlet 10, the third gas discharge port 400 and the second pressure gauge 60 are all arranged at the top of the tank body, the third gas discharge port 400 is arranged on one side of the spare water outlet, and the second pressure gauge 60 is arranged on the other side of the spare water outlet 10; the third water outlet 90 is arranged on the upper side of the tank body and is arranged above the inclined tube settling zone 11; the composite zero-valent iron material discharge inlet 21 is connected with the other end of a drain pipe 211 of the solid-liquid separation tank II, and the composite zero-valent iron material discharge inlet 21 is arranged on one side of the compact reaction zone 13; the two second loading and unloading ports 70 are arranged in a staggered manner with the two return pipelines 14; the two second loading and unloading material ports 70 are formed on the other side of the compacting reaction zone 13; one of the two return pipelines 14 is arranged at the other side of the compact reaction zone 13, and the other return pipeline is arranged below the porous supporting layer 20; the wastewater inlet 15 is arranged at the bottom of the tank body, one side of the wastewater inlet 15 is also provided with a vent 16, and the water inlet end of the wastewater inlet 16 is also connected with a wastewater inlet pipe 151; valves are arranged on the wastewater inlet pipe 151, the second water outlet pipe 902 and the return pipe 801.
The porous supporting layer 20 is provided with the particle filler, the thickness of the porous supporting layer is 20cm, uniform water distribution can be guaranteed, a part of deposited composite nano material is guaranteed to fall onto the particle filler and can be fully contacted with sewage, a backflow pipe is arranged below the porous supporting layer to prevent biological materials from being accumulated, and the backflow device is properly started to promote the water distribution performance of the particle filler.
The acid adjusting zone 17, the Fenton reaction zone 18 and the alkali adjusting zone 19 are respectively and correspondingly provided with a second stirrer 501, a third stirrer 502 and a fourth stirrer 503; the pH range of the acid regulation area 17 is 3-3.5; the pH range of the alkali adjustment area 19 is 8-8.5.
The utility model discloses work flow as follows:
step one, preparing a biochar-nickel material: soaking the biochar in a proper amount of NiCl6·6H2Stirring and mixing the O solution, soaking for more than 12h, and drying for more than 10h at the temperature of 45-50 ℃ in a drying oven to prepare the biochar-nickel material containing nickel ions; step two, preparing the biochar-nickel loaded nano zero-valent iron material: adding a proper amount of biochar-nickel material into a synthesizer, and adding a certain amount of 1-1.5mol/L FeSO4·7H2Adding the O solution into a synthesis tank, fully mixing and stirring the O solution for more than 30min by a first stirrer, and titrating 1.5-2mol/L KBH with the same volume4Solution, then to Fe at a rate of 50-60 drops/min2+The KBH is dripped into the mixed solution4And after the solution is dropwise added, stirring the solution for more than 30min to fully react, wherein the prepared biochar-nickel material is loaded with nano zero-valent iron, and the reaction equation is as follows:
Fe2++2BH4 -+6H2O→Fe0↓+2B(OH)3+7H2↑；
step three, discharging the solid-liquid mixture into a solid-liquid separation tank for solid-liquid separation after the reaction is finished, standing for more than 30min, controlling through a lower valve, allowing the separated solid composite nano material to enter a reaction tank, and allowing liquid containing ferrous ions to flow back to a nano zero-valent iron synthesis tank for synthesis in the next period;
discharging the solid composite nano material into a compact reaction zone of a wastewater reaction tank to react with pyridine wastewater, reacting in a mixed reaction zone, outputting clear water to a Fenton pool from a solid-liquid mixture after reaction through an inclined tube settling zone, and allowing the composite nano material to fall onto a porous supporting layer; the pyridine wastewater enters from a lower wastewater inlet 15;
step five, finally, adjusting the pH value to 3-3.5 through an acid adjusting area, discharging water to a Fenton area, and adding H in the Fenton area2O2Performing Fenton reaction on ferrous iron generated by nano zero-valent iron reaction to generate OH, further performing redox reaction on the OH and pyridine wastewater, allowing the OH and the pyridine wastewater to enter an alkali adjusting zone after the reaction, adjusting the pH to 8-8.5, and allowing the pH to flow into a sedimentation tank.
The biochar and the nickel ions in the step one are stirred, mixed and dried firstly, so that the biochar-nickel material loaded with the nano zero-valent iron is increased and uniformly distributed on the surface of the carrier, the migration capability in the solution is enhanced, and the formed ferronickel bimetal can promote the nano zero-valent iron to lose electrons and promote the reaction with the pyridine wastewater.
The biochar material in the first step is porous carbon processed by organic garbage, and the organic garbage is selected from one or more of animal wastes, animal bones, plant roots and stems, wood chips and wheat straws.
The particle size of the biochar-nickel loaded nano zero-valent iron material in the step two after synthesis is 50-200nm, and the weight ratio of biochar, nano nickel and nano zero-valent iron is 2: 1: 3.
according to the biochar-nickel loaded nano zero-valent iron material, due to the large specific surface area of the biochar, Fe-C, Fe-Ni forms a micro-battery effect, and reacts with organic matters to form a complex mechanism: (1) the adsorption effect of the biochar is favorable for the contact of the nano zero-valent iron in the surface layer and the gaps of the biochar with organic matters in the wastewater; (2) the Fe-C, Fe-Ni micro battery acts to promote the transfer of electrons and enhance the degradation of organic matters.
The pyridine wastewater in the fourth step is organic wastewater generated in the process of generating pyridine derivative pesticide products, and is selected from one or more of clopyralid, tetrachloropyridine, pentachloropyridine and 2, 3, 5, 6-tetrachloropyridine thiol chemical products, and the inlet water needs to be slightly acidic, neutral and alkaline, and needs to be adjusted to pH 4.5-5.5. The pyridine wastewater enters from the lower wastewater inlet 15, and the solid-liquid mixture is subjected to solid-liquid separation by gravity in the rising process, so that the clear water can be ensured to flow out from the third water outlet 90 through the inclined tube settling zone 11.
The sedimentation tank in the fifth step is used for removing suspended matters in water, and the suspended matters are Fe (OH)2、Fe(OH)3And one or more of the complexes thereof, wherein the sedimentation tank is selected from one of horizontal flow type, vertical flow type and radial flow type, supernatant liquid flows into a biochemical section for biochemical treatment, and an iron mud discharge end is connected with a separate mud storage tank in a gathering manner through a pipeline and can be recycled.
(1) The biochar-nickel loaded nano zero-valent iron material is quickly manufactured on site, manufactured at any time and supplemented at any time, so that the problem of activity reduction caused by agglomeration and oxidation of the nano zero-valent iron material due to improper operation and storage is solved; (2) the tower type contact reaction tower utilizes the characteristics of material gravity in hydromechanics, and is provided with an inclined tube settling zone, a mixed reaction zone, a compact reaction zone, a backflow pipeline and the like, so that the contact space between a water body and the material is promoted, and the material is intercepted in the reaction zone; (3) fe is generated after the reaction of the nano zero-valent iron2+And further processing by utilizing a Fenton technology. The biological carbon-nickel material loaded nano zero-valent iron + Fenton technology is used for pretreating pyridine wastewater, degrading pyridine derivatives which are difficult to degrade in the common technology, reducing biotoxicity, removing or decomposing most of undetectable COD (chemical oxygen demand) parts, improving biodegradability, preventing pyridine organic matters from being enriched in activated sludge in long-term operation, and ensuring that the treatment reaches the standard.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (8)
1. The utility model provides a compound nanometer zero-valent iron material preliminary treatment pyridine waste water device which characterized in that includes: the device comprises a nano zero-valent iron synthesis tank, a solid-liquid separation tank, a wastewater reaction tank, a Fenton pool and a sedimentation tank which are sequentially communicated; the wastewater reaction tank comprises an inclined tube settling zone, a mixed reaction zone, a compact reaction zone and a porous supporting layer which are arranged in sequence; the Fenton pool comprises an acid regulation area, a Fenton reaction area and an alkali regulation area which are sequentially communicated.
2. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 1, wherein the nano zero-valent iron synthesis tank comprises a tank body, and a ferrous ion dosing port, a potassium borohydride dosing port, a nitrogen gas inlet, a first gas discharge port, a first stirrer, a first pressure gauge, a first loading and unloading port, a backflow port, a first water outlet pipe and a backflow pipe which are arranged on the tank body.
3. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 2, wherein the first stirrer head is arranged at the top of the tank body, and the stirring part is arranged in the tank body in a penetrating manner; the first gas discharge port is arranged on one side of the first stirrer, and the first pressure gauge is arranged on the other side of the first stirrer; the ferrous ion dosing port, the potassium borohydride dosing port and the nitrogen gas inlet are correspondingly arranged on one side of the tank body; the first loading and unloading material port and the backflow port are correspondingly arranged on the other side of the tank body; the first water outlet is arranged at the bottom of the tank body; one end of the first water outlet pipe is connected with the first water outlet, and the other end of the first water outlet pipe is connected with the solid-liquid separation tank; one end of the backflow pipe is connected with the backflow port, and the other end of the backflow pipe is connected with the solid-liquid separation tank.
4. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 3, wherein the solid-liquid separation tank comprises a second tank body, a liquid inlet, a second gas discharge port, a second water outlet and a water discharge pipe which are arranged on the second tank body, and a tee joint arranged on the second water outlet;
5. the device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 4, wherein the second gas discharge port is arranged at the top of the second tank body; the liquid inlet is arranged on the upper side of the second tank body; the second water outlet is arranged at the bottom of the tank body; the other end of the first water outlet pipe is connected with a liquid inlet of the solid-liquid separation tank; the other end of the return pipe is connected with one end of a tee joint of the solid-liquid separation tank; one end of the water discharge pipe is connected with the other end of the tee joint.
6. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 5, wherein the waste water reaction tank comprises a third tank body, a standby water outlet, a third gas discharge port, a second pressure gauge, a third water outlet, a second water outlet pipe connected with the third water outlet, two second loading and unloading ports, two backflow pipelines, a composite zero-valent iron material discharge port and a waste water inlet, wherein the standby water outlet, the third gas discharge port, the second pressure gauge and the third water outlet are arranged on the third tank body.
7. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 6, wherein the standby water outlet, a third gas discharge port and a second pressure gauge are all arranged at the top of the tank body, the third gas discharge port is arranged on one side of the standby water outlet, and the second pressure gauge is arranged on the other side of the standby water outlet; the third water outlet is arranged on the upper side of the tank body and is arranged above the inclined tube settling zone; the composite zero-valent iron material discharge inlet is connected with the other end of the drain pipe of the solid-liquid separation tank, and is arranged at one side of the compact reaction zone; the two loading and unloading material ports and the two backflow pipelines are arranged in a staggered mode; the two loading and unloading materials are arranged on the other side of the compaction reaction area; one of the two backflow pipelines is arranged at the other side of the compact reaction zone, and the other backflow pipeline is arranged below the porous supporting layer; the waste water inlet is arranged at the bottom of the tank body, one side of the waste water inlet is provided with a vent, and the water inlet end of the waste water inlet is connected with a waste water inlet pipe.
8. The device for pretreating pyridine waste water by using the composite nano zero-valent iron material according to claim 1, wherein a second stirrer, a third stirrer and a fourth stirrer are correspondingly arranged in the acid adjusting zone, the Fenton reaction zone and the alkali adjusting zone.
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| CN202121054208.3U CN215249796U (en) | 2021-05-17 | 2021-05-17 | Device for pretreating pyridine wastewater by using composite nano zero-valent iron material |
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