CN210193483U - Device and system for efficiently removing total nitrogen through iron-carbon catalytic reduction - Google Patents
Device and system for efficiently removing total nitrogen through iron-carbon catalytic reduction Download PDFInfo
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- CN210193483U CN210193483U CN201921075467.7U CN201921075467U CN210193483U CN 210193483 U CN210193483 U CN 210193483U CN 201921075467 U CN201921075467 U CN 201921075467U CN 210193483 U CN210193483 U CN 210193483U
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Abstract
The utility model discloses a total nitrogen device and system are got rid of to iron carbon catalytic reduction high efficiency, total nitrogen device is got rid of to iron carbon catalytic reduction high efficiency includes the casing, lays at the cobblestone layer of casing bottom, inserts the defeated pipe of establishing in cobblestone layer and sets up the iron carbon layer in cobblestone layer top, it throws the hole to have seted up the material on the casing at iron carbon layer top place, the top of casing is equipped with out the water weir, the top of casing is equipped with the gas collecting channel, and this gas collecting channel is connected with the air inlet of exhaust fan. The iron-carbon catalytic reduction high-efficiency total nitrogen removal device provided by the utility model has good treatment effect on waste water which is difficult to be treated and has high salinity, and the total nitrogen removal rate can reach more than 80%; the utility model utilizes the iron-carbon catalytic reduction technology, and has higher reliability compared with the biochemical treatment denitrification technology; the utility model provides a total nitrogen system process facilities are got rid of to iron carbon catalytic reduction high efficiency few, easy operation, and it can control to reach or be less than the emission standard value to go out water completely.
Description
Technical Field
The utility model relates to a waste water treatment technical field, concretely relates to total nitrogen device and system are got rid of to iron carbon catalytic reduction high efficiency.
Background
The denitrification technology for wastewater treatment comprises the technology for removing ammonia nitrogen and total nitrogen (including ammonia nitrogen, organic nitrogen, nitrate nitrogen and the like) in wastewater. The utility model discloses the main objective is total nitrogen of nitrate state class in the desorption waste water, and the technique of removing total nitrogen of nitrate state in the waste water mainly has microbial denitrification denitrogenation technique, ion exchange denitrogenation technique, reverse osmosis denitrogenation technique, traditional iron and carbon reduction denitrogenation technique etc..
The basic principle of the microbial denitrification technology is that denitrifying bacteria reduce nitrate nitrogen into N by using carbon source organic matters in wastewater2The process technology for removing the wastewater from water has low operation cost and reliable technology, and is a mature technology applied to the municipal and industrial wastewater treatment field. But also has great limitation in application, when high-concentration nitrate-nitrogen wastewater is encountered, the biological denitrification reaction needs to add a large amount of carbon source substances, and the biological reaction can be carried out. When the industrial wastewater contains high salt content or harmful substances, the activity of denitrifying bacteria is deteriorated, and the denitrification effect cannot be ensured.
The ion exchange denitrification technology, anion exchange resin can exchange nitric acid and nitrite to remove total nitrogen in water. However, ion exchange is a physical and chemical transfer process, nitrate nitrogen is transferred from waste water to resin, when the resin is saturated, the exchange capacity is lost, the resin can be used continuously after regeneration, and the regenerated liquid generated during regeneration is waste liquid with higher total nitrogen concentration, and can be thoroughly treated by further evaporation or drying.
The reverse osmosis denitrification technology is characterized in that wastewater flows in the cavity of the RO reverse osmosis membrane assembly, the wastewater is pressurized by a water pump, clean water enters a fresh water side through an RO membrane, and anions and cations of most metal salts cannot penetrate the membrane and can only be left on one side of a membrane concentrated water chamber. The result is that the fresh water chamber side is purified and the concentrate chamber side concentrates the contaminants in the raw water. The concentrated water discharged from one side of the concentrated water chamber needs further treatment as the ion exchange concentrated waste liquid.
The traditional iron-carbon reduction denitrification technology has few engineering applications, and the basic principle is that under the condition of proper control, nitrate nitrogen reacts with iron carbon to generate NO and N2O、N2、NH4 +Etc. with certain total nitrogen eliminating rate and the demerits of easy passivation of iron surface to prevent further reaction and to produce NO and N2More O and longer reaction time, which are more than two hours, and the total nitrogen removal efficiency is low, which is about 30-45%.
Because of the reduction process of nitrate nitrogen by iron carbon, the reactions of the waste water are different in pH value, nitrate nitrogen concentration and temperature, and the products are different. The traditional iron-carbon reduction technology can not accurately control the reaction type, only converts part of nitrate nitrogen into other forms of nitrogen, and does not remove the nitrogen from water, so that the problems of high nitrate nitrogen removal rate and no real reduction of total nitrogen occur.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model provides a total nitrogen device and system are got rid of to iron carbon catalytic reduction high efficiency to because unable accurate control reaction type, only change nitrate nitrogen into the nitrogen of other forms among the solution prior art, not get rid of it from the aquatic, lead to nitrate state nitrogen clearance height and total nitrogen does not really reduce the problem.
In order to achieve the above object, the present invention provides the following technical solutions:
according to the utility model discloses an on the one hand, provide a total nitrogen device is got rid of to iron carbon catalytic reduction high efficiency, including the casing, lay in the cobble layer of casing bottom, insert the defeated pipe of establishing in the cobble layer and set up the iron carbon layer in cobble layer top, the material has been seted up on the casing at iron carbon layer top place and has been thrown the hole, the top of casing is equipped with out the water weir, the top of casing is equipped with the gas collecting channel, and this gas collecting channel is connected with the air inlet of exhaust fan.
Further, the lower part of the shell is provided with a cleaning hole which is communicated with the cobble layer and the iron carbon layer.
Furthermore, a sealing cover is arranged on the cleaning hole.
Furthermore, a sealing cover is arranged on the material feeding hole.
Furthermore, a plurality of through holes are uniformly distributed on the conveying pipe.
Furthermore, a water-gas change-over switch is arranged on the transmission pipe.
Furthermore, a water storage hopper connected with the water outlet weir is arranged at the upper part of the shell, a water outlet is arranged at the bottom of the water storage hopper, and supernatant of the water outlet weir is discharged from the water outlet at the bottom of the water storage hopper.
According to the second aspect of the utility model, the system for removing total nitrogen efficiently by iron-carbon catalytic reduction is provided, which comprises a heat exchanger, a first pH adjusting tank, an iron-carbon catalytic reduction apparatus for removing total nitrogen efficiently, a second pH adjusting tank, an oxidative decomposition tank, a flocculation tank and a precipitation tank, the input end of the heat exchanger is filled with nitrogen-containing wastewater, the output end of the heat exchanger is connected with the input end of the first pH adjusting tank, the output end of the first pH adjusting tank is connected with the input end of the iron-carbon catalytic reduction high-efficiency total nitrogen removal device, the output end of the iron-carbon catalytic reduction high-efficiency total nitrogen removal device is connected with the input end of the second pH adjusting tank, the output end of the second pH adjusting tank is connected with the input end of the oxidation decomposition tank, the output end of the oxidation decomposition tank is connected with the input end of the flocculation tank, and the output end of the flocculation tank is connected with the input end of the sedimentation tank.
Further, the system for efficiently removing total nitrogen through iron-carbon catalytic reduction also comprises a sludge tank, and the sludge tank is connected with the precipitation tank through a sludge discharge pump.
The utility model has the advantages of as follows:
(1) the iron-carbon catalytic reduction high-efficiency total nitrogen removal device provided by the utility model has good treatment effect on waste water which is difficult to be treated and has high salinity, and the total nitrogen removal rate can reach more than 80%; the utility model utilizes the iron-carbon catalytic reduction technology, and has higher reliability compared with the biochemical treatment denitrification technology;
(2) the system for efficiently removing the total nitrogen by the iron-carbon catalytic reduction has the advantages of few process facilities, simple operation, low operation cost and low price after the batch production of the iron-carbon filler, and can completely control the effluent to reach or be lower than the emission standard value; in addition, the method has the advantages of high practicability, stable process, simple operation and no other pollutants, and can be almost used for treating various types of wastewater.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope of the present invention.
Fig. 1 is a schematic structural diagram of an iron-carbon catalytic reduction high-efficiency total nitrogen removal device provided by the utility model 1;
FIG. 2 is a schematic view of an iron-carbon catalytic reduction system for removing total nitrogen with high efficiency according to the present invention 2;
in the figure: 1-a housing; 2-cobble layer; 3, conveying the pipe; 4-iron carbon layer; 5-material feeding hole; 6, a water outlet weir; 7-gas collecting channel; 8, cleaning holes; 9-water outlet; 10-a heat exchanger; 11-first pH adjustment tank; 12-a device for efficiently removing total nitrogen by iron-carbon catalytic reduction; 13-second pH adjustment tank; 14-oxidative decomposition tank; 15-flocculation tank; 16-a precipitation tank.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a total nitrogen device is got rid of to iron carbon catalytic reduction high efficiency, including casing 1, lay in the cobble layer 2 of casing 1 bottom, insert the defeated pipe 3 of establishing in cobble layer 2 and set up the iron carbon layer 4 in cobble layer 2 top, material throwing hole 5 has been seted up on the casing 1 at the position of iron carbon layer 4 top, the top of casing 1 is equipped with out the water weir 6, the top of casing 1 is equipped with gas collecting channel 7, and this gas collecting channel 7 is connected with the air inlet of exhaust fan to with the N gas inlet of effusion2And the gas is discharged out of the room.
Further, the lower part of the shell 1 is provided with a cleaning hole 8, the cleaning hole 8 is communicated with the cobblestone layer 2 and the iron carbon layer 4, iron carbon can be supplemented in time, and the bottom of the device can be cleaned.
Furthermore, a sealing cover is arranged on the cleaning hole 8. And a sealing cover is arranged on the material feeding hole 5.
Furthermore, a plurality of through holes are uniformly distributed on the conveying pipe 3 so as to realize uniform water distribution.
Furthermore, a water-gas change-over switch is arranged on the delivery pipe 3, so that water inlet or air inlet is controlled, and air is introduced at regular time to sweep impurities, carbon dust and the like with small particle size, so that the phenomenon of 'channeling' is prevented.
Furthermore, a water storage bucket connected with the water outlet weir 6 is arranged at the upper part of the shell 1, a water outlet 9 is arranged at the bottom of the water storage bucket, and supernatant of the water outlet weir 6 is discharged from the water outlet 9 at the bottom of the water storage bucket.
The device for efficiently removing total nitrogen through iron-carbon catalytic reduction provided by the embodiment has a good treatment effect on wastewater which is difficult to biochemically and has high salinity, and the total nitrogen removal rate can reach more than 80%; the utility model utilizes the iron-carbon catalytic reduction technology, and has higher reliability compared with the biochemical treatment denitrification technology;
example 2
On the basis of the technical scheme of embodiment 1, the system for efficiently removing total nitrogen through iron-carbon catalytic reduction comprises a heat exchanger 10, a first pH adjusting tank 11, an iron-carbon catalytic reduction device 12 for efficiently removing total nitrogen, a second pH adjusting tank 13, an oxidative decomposition tank 14, a flocculation tank 15 and a precipitation tank 16, wherein nitrogen-containing wastewater is introduced into the input end of the heat exchanger 10, the output end of the heat exchanger 10 is connected with the input end of the first pH adjusting tank 11, the output end of the first pH adjusting tank 11 is connected with the input end of the iron-carbon catalytic reduction device 12 for efficiently removing total nitrogen, the output end of the iron-carbon catalytic reduction device 12 for efficiently removing total nitrogen is connected with the input end of the second pH adjusting tank 13, the output end of the second pH adjusting tank 13 is connected with the input end of the oxidative decomposition tank 14, and the output end of the oxidative decomposition tank 14 is connected with the input end of the flocculation tank 15, the output end of the flocculation tank 15 is connected with the input end of the sedimentation tank 16.
Further, the system for efficiently removing total nitrogen through iron-carbon catalytic reduction further comprises a sludge tank, and the sludge tank is connected with the precipitation tank 16 through a sludge discharge pump.
The system for efficiently removing the total nitrogen by the iron-carbon catalytic reduction provided by the embodiment has the advantages of few process facilities, simple operation, low operation cost and low price of iron-carbon filler after batch production, and effluent can be completely controlled to reach or be lower than a discharge standard value; in addition, the method has the advantages of high practicability, stable process, simple operation and no other pollutants, and can be almost used for treating various types of wastewater.
First, the principle of the device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction provided by embodiment 1 is as follows:
1. in consideration of the requirements of acid and alkali resistance and electrochemical corrosion, the main material of the device for efficiently removing total nitrogen through iron-carbon catalytic reduction is glass fiber reinforced plastic. Cobblestones with proper grain size are paved at the bottom of the device so as to distribute water uniformly and have the function of air distribution, and water inlet or air inlet is controlled through a water-air change-over switch. The function of regularly introducing air is to blow impurities, carbon dust and the like with small particle size, so as to prevent the phenomenon of 'channeling'. The wastewater enters the device after pH adjustment and temperature rise, is uniformly distributed by the through holes on the conveying pipe 3, flows upwards to pass through the cobble layer 2 and the iron carbon layer 4 in sequence, and generates a series of reactions when flowing through the iron carbon layer 4 to convert total nitrogen into N2Removal or conversion to NH4 +Form (a). The treated wastewater flows out of the effluent weir 6 and enters the subsequent process. Oxidizing ammonia nitrogen in wastewater into N by subsequent process2And removing to improve the removal rate of the total nitrogen. A gas collecting hood 7 is arranged above the device for efficiently removing the total nitrogen by iron-carbon catalytic reduction, and the escaped N is discharged under the action of an exhaust fan2And the gas is discharged out of the room. The gas-collecting channel 7 has a certain distance from the shell 1, which is convenient for observing the reaction condition in the device at any time. In addition, the material feeding hole 5 and the cleaning hole 8 are arranged, so that iron and carbon can be supplemented in time, and the bottom of the device can be cleaned.
2. The removal of total nitrogen by the iron-carbon reduction method is mainly divided into two stages:
(1) and (3) iron-carbon reduction stage: iron-carbon is a filler made of iron, carbon, catalyst and other metal catalyst activators by high-temperature sintering. After the iron carbon is put into the industrial wastewater, a plurality of tiny electrolytic systems are formed in the aqueous solution due to the 1.2V electrode potential difference between Fe and C. Fe as anode loses electrons to generate a large amount of Fe2+Into solution, NO3 -The obtained electrons can generate NO and N2O、N2Or NH4 +. The reaction formula is as follows:
Fe+2H+→Fe2++H2↑ (1)
C+NO→CO2+N2↑ (4)
the most core technology of the iron-carbon catalytic reduction device for efficiently removing the total nitrogen during operation is to control the Fe/C ratio and the water inlet temperature of the iron-carbon catalytic filler so as to avoid the reactions of the formulas (2) and (3), strengthen the reactions of the formulas (4), (5) and (6), and ensure that most of the first-stage reaction generates N2And NH4 +。
(2) NaClO oxidation stage: in the above-mentioned containing NH4 +After NaClO is added into the solution, ammonia nitrogen is converted into nitrogen gas to be removed through a series of reactions.
2NH4 ++4NaClO→4NaCl+N2↑+4H2O
And Fe when NaClO is present2+Is further oxidized into Fe3+，Fe2+And Fe3+The hydrate has stronger adsorption-flocculation activity. When the pH in the solution is higher, Fe (OH) is formed2、Fe(OH)3、Fe(OH)2+And Fe (OH)+The flocculation effect of the colloid coagulant is better than that of Fe (OH) generated by hydrolysis of general medicaments3Insoluble matter which gives rise to chromaticity can be removed at the same time.
Secondly, the principle of the system for efficiently removing total nitrogen through iron-carbon catalytic reduction provided by the embodiment 2 is as follows:
the nitrogen-containing wastewater firstly enters a heat exchanger 10, the water temperature is raised to a proper temperature, and then the nitrogen-containing wastewater enters a first pH adjustmentA tank 11 for adjusting pH to 2.5 to 3.0. The initial pH of the wastewater has a large influence on the removal of total nitrogen, the greater the pH, the lower the removal rate, which is related to the chemical reactions taking place in the solution. As can be seen from the reaction formulae listed in the formula (2), a large amount of H is consumed in the course of the reaction+，H+The amount of (c) also affects the type of product. In addition, at higher pH, iron ions are readily hydrolyzed to FeO (OH) and Fe3O4The yield of (a) is reduced and the resulting feo (oh) is non-conductive, preventing electrolysis from occurring, thus affecting the reduction of nitrate nitrogen, ultimately resulting in a reduced total nitrogen removal rate.
And (4) the wastewater after pH adjustment enters an iron-carbon catalytic reduction device. As described above, in the case of controlling the appropriate conditions, the reactions (4), (5) and (6) predominate, and nitrate nitrogen is converted more into N2And NH4 +，N2Escaping from the water. And the reduced NH-containing4 +The wastewater enters a second pH adjustment tank 13, the pH of which is adjusted to 7.5, and then enters an oxidative decomposition tank 14. NaClO is added into the oxidative decomposition tank 14, and original NH in the wastewater4 +And NH generated in the reduction reaction4 +The nitrogen is converted to escape under the oxidation action of NaClO. Then the wastewater enters a flocculation tank 15, and a flocculating agent PAM is added to form larger flocs. In the settling tank 16, the flocs sink to the bottom of the settling tank 16 under the action of gravity, clear liquid is separated to the upper part of water and is discharged from the effluent weir 6, and sludge at the bottom is periodically pumped to a sludge tank by a sludge discharge pump.
Test examples
The test instrument: 1. hash DRB200, hash DR 900; 2, a pH meter; 3. analytical balance, single universal electric furnace; 4. glass instruments such as beakers and measuring cylinders; 5.1mL of a liquid-transfering gun and a water temperature meter; 6. pure water; 7. medicine preparation: iron carbon filler, 10% NaOH, 13% H2SO40.1% of PAM (anion), 5% of NaClO, a Hash instrument matching reagent and the like.
The test steps are as follows:
(1) cleaning 2000g of iron carbon with water, and drying;
(2) preparing 1000mL of total nitrogen wastewater, and adjusting the pH value to 2.5;
(3) transferring the wastewater after adding the acid into a reaction beaker filled with iron-carbon filler, heating the wastewater by using a universal electric furnace to ensure that the temperature of the water rises to 60-70 ℃, and reacting for 60 min;
(4) transferring the reduced wastewater into a beaker, and then adjusting the pH value to 7.5;
(5) 500mL of the above solution was added with 10mL of 5% NaClO;
(6) adding 0.5mL of PAM (anion), stirring at a slow speed, precipitating for 10min, and sampling for detection.
And (3) test results:
TABLE 1
As can be seen from the results in Table 1, the simulation test device has a relatively high removal rate of total nitrogen, which can reach more than 80 percent, and the nitrate nitrogen is removed by being converted into N2And the water is completely removed from the water, and the removal rate and the reliability are incomparable with those of the traditional physical and chemical denitrification equipment.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. The utility model provides a total nitrogen device is got rid of to iron carbon catalytic reduction high efficiency which characterized in that: the cobble layer comprises a shell, a cobble layer paved at the bottom of the shell, a conveying pipe inserted in the cobble layer and an iron-carbon layer arranged above the cobble layer, wherein a material feeding hole is formed in the shell above the iron-carbon layer, a water outlet weir is arranged at the top of the shell, a gas collecting hood is arranged above the shell and is connected with an air inlet of an exhaust fan.
2. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 1, characterized in that: the lower part of the shell is provided with a cleaning hole which is communicated with the cobble layer and the iron carbon layer.
3. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 2, characterized in that: and a sealing cover is arranged on the cleaning hole.
4. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 1, characterized in that: and a sealing cover is arranged on the material feeding hole.
5. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 1, characterized in that: a plurality of through holes are uniformly distributed on the conveying pipe.
6. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 1, characterized in that: and a water-gas change-over switch is arranged on the transmission pipe.
7. The device for removing total nitrogen with high efficiency by iron-carbon catalytic reduction according to claim 1, characterized in that: the upper part of the shell is provided with a water storage bucket connected with the water outlet weir, and the bottom of the water storage bucket is provided with a water outlet.
8. The utility model provides a total nitrogen system is got rid of to iron carbon catalytic reduction high efficiency which characterized in that: the device comprises a heat exchanger, a first pH adjusting tank, the iron-carbon catalytic reduction high-efficiency total nitrogen removal device as claimed in any one of claims 1 to 7, a second pH adjusting tank, an oxidative decomposition tank, a flocculation tank and a precipitation tank, wherein nitrogen-containing wastewater is introduced into the input end of the heat exchanger, the output end of the heat exchanger is connected with the input end of the first pH adjusting tank, the output end of the first pH adjusting tank is connected with the input end of the iron-carbon catalytic reduction high-efficiency total nitrogen removal device, the output end of the iron-carbon catalytic reduction high-efficiency total nitrogen removal device is connected with the input end of the second pH adjusting tank, the output end of the second pH adjusting tank is connected with the input end of the oxidative decomposition tank, the output end of the oxidative decomposition tank is connected with the input end of the flocculation tank, and the output end of the flocculation tank is connected.
9. The system for removing total nitrogen with high efficiency through iron-carbon catalytic reduction according to claim 8, wherein: still include the sludge impoundment, this sludge impoundment is connected with the precipitation tank through the dredge pump.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517591A (en) * | 2020-06-11 | 2020-08-11 | 北京工业大学 | Device and method for treating oxidized nitrogen wastewater by using ferroalloy in combination with anaerobic ammonium oxidation bacteria |
| CN111533233A (en) * | 2020-05-09 | 2020-08-14 | 浙江工业大学 | Total nitrogen remover and preparation method and application thereof |
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2019
- 2019-07-10 CN CN201921075467.7U patent/CN210193483U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111533233A (en) * | 2020-05-09 | 2020-08-14 | 浙江工业大学 | Total nitrogen remover and preparation method and application thereof |
| CN111517591A (en) * | 2020-06-11 | 2020-08-11 | 北京工业大学 | Device and method for treating oxidized nitrogen wastewater by using ferroalloy in combination with anaerobic ammonium oxidation bacteria |
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