CN112573607A - Device and method for recycling ammonia nitrogen in urine through hydraulic cyclone - Google Patents
Device and method for recycling ammonia nitrogen in urine through hydraulic cyclone Download PDFInfo
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- CN112573607A CN112573607A CN202011457848.9A CN202011457848A CN112573607A CN 112573607 A CN112573607 A CN 112573607A CN 202011457848 A CN202011457848 A CN 202011457848A CN 112573607 A CN112573607 A CN 112573607A
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
Abstract
The invention relates to a device and a method for recycling ammonia nitrogen in urine by hydraulic cyclone. The cyclone consists of two vertical concentric organic glass tubes, the top is provided with a gas outlet, the bottom is of a double-layer structure, the inner layer comprises a material inlet, and the outer layer comprises two material outlets. In the device, strong convective mass transfer is generated between urine and air from an air compressor in a section of thin hose with the inner diameter of 5mm, gas-liquid separation is realized through a cyclone, the separated gas enters an upper end gas phase space and is discharged from a top outlet, and the blown-off ammonia is absorbed by HCl and converted into ammonium chloride for recovery. The invention adopts the mode of combining rotational flow and blowing-off, strengthens the gas-liquid mass transfer process, recycles the ammonia in the urine as resources, has simple equipment structure, simplifies the process operation steps, effectively reduces the equipment investment and the site occupation, and does not generate secondary pollution such as solid waste or waste gas and the like.
Description
Technical Field
The invention relates to a device and a method for recycling ammonia nitrogen in urine by hydrocyclone, in particular to a device and a method for realizing gas-liquid separation of urine wastewater and recycling ammonia nitrogen based on the auxiliary actions of centrifugation, sedimentation and the like of a hydrocyclone. Belongs to the technical field of sewage treatment.
Background
At present, eutrophication of water body caused by random discharge of sewage containing a large amount of nutrient substances such as nitrogen, phosphorus and the like becomes a global problem. Ammonia nitrogen wastewater mainly comes from human activities, wherein urine and landfill leachate are typical urban ammonia nitrogen wastewater. The urine only accounts for 1 percent of the total amount of the wastewater, but contains 70 to 80 percent of nitrogen, 50 percent of phosphorus and 90 percent of potassium in municipal sewage. The urine is separately collected and treated, so that the concentration of nitrogen and phosphorus entering a sewage treatment plant can be reduced, the cost of sewage treatment is reduced, and nutrient substances in the urine can be recovered and used as fertilizers to be applied to agriculture. In fresh urine, nitrogen is mainly present as urea, but under the influence of urease, urea in stored urine decomposes to form ammonium, which can be converted to ammonia at high pH and lost to the atmosphere. Therefore, it is of practical significance to promote the complete hydrolysis of urine and remove and recover the generated ammonia from the urine.
The ammonia separated by the existing deamination device is generally directly discharged into the air, so that secondary pollution such as waste gas is generated, resource waste is caused, the equipment investment is large, the occupied space is large, the process flow is long, the operation is inconvenient, and the treatment efficiency is low. Therefore, there is a need for improvements and optimizations to the prior art. The cyclone is a compact separator with high separation efficiency, realizes high-efficiency separation of mixtures with different densities by utilizing a centrifugal force field, can also be used for concentration and dehydration, has the advantages of simple structure, convenient operation, no moving parts, small occupied area, large treatment capacity, high separation efficiency and the like, and is widely applied to the fields of coal dressing, petroleum and chemical industry. The cyclone with lean design can also be used for gas-liquid intensified mass transfer, such as crude oil dehydration in offshore oil industry, amine-rich degassing in oil refining, hydrogen recovery in oil, and the like.
Chinese patent CN103482824B discloses a method and a device for rapidly recovering nutrients such as nitrogen and phosphorus in urine, which utilize microorganisms in sludge to catalyze urea to decompose, and add magnesium salt and phosphorus salt to recover generated magnesium ammonium phosphate precipitate, but the transportation and treatment of the sludge cause great burden to the environment, and part of ammonium ions are converted into ammonia gas to be discharged, thereby causing nitrogen loss and being difficult to realize the maximization of recovery benefit; the water conservancy whirl method that this application provided energy consumption is lower when retrieving the ammonia nitrogen operation in the urine, and environmental impact is little, untreated complete urine backward flow secondary blow-off, and the ammonia nitrogen rate of recovery is high. Chinese patent CN105377768B adopts an ion exchanger adsorption mode to recover nutrient substances from hydrolyzed urine, and the method has large consumption of the adsorbent, needs preprocessing treatment on the adsorption raw materials, and has complex process and high cost; the water conservancy whirl blows and takes off method that this application provided can reach 93% ammonia nitrogen recovery rate, easy operation when guaranteeing the benefit of retrieving, and is with low costs, and is little to the environmental impact.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a method for recycling ammonia nitrogen in urine by hydraulic cyclone, which can efficiently remove and recycle ammonia nitrogen in urine, thereby solving the problems in the prior urine sewage deamination recycling technology.
The invention provides a device for recycling ammonia nitrogen in urine by hydrocyclone, which is characterized in that the main body of the device is a columnar cyclone (9), the columnar cyclone (9) comprises two concentric inner pipes (18) and outer pipes (19), the height of the inner pipes is smaller than that of the outer pipes, the bottom of the columnar cyclone (9) is composed of double-layer glass plates, the bottom of the inner pipe at the first layer of glass plate is provided with a tangential material inlet (14), the tangential material inlet (14) is sequentially connected with a gas-liquid mixing section thin hose (11) and a valve port of a tee joint (17), the bottom of the outer pipe at the second layer of glass plate is provided with two tangential material outlets (15) which are connected with an upper inlet of a material storage tank (1), the second valve port of the tee joint (17) is connected with an air compressor (8), a connecting pipeline is provided with a flowmeter, and the third valve port of the tee joint (17), A high-pressure diaphragm pump (2) and a bottom outlet of the material storage tank (1); the top of the columnar cyclone (9) is provided with an ammonia and air outlet (16), and a pipeline led out from an outlet at the upper part of the material storage tank is merged into the columnar cyclone through a second tee joint (20) and is sequentially connected with an HCl storage tank (12) and an NaOH storage tank (13).
Preferably, the inner diameter of the gas-liquid mixing section thin hose (11) is 5 mm.
Preferably, the inner tube has a diameter of 34mm and a height of 210mm, and the outer tube has a diameter of 49mm and a height of 400 mm.
The invention also provides a method for recycling ammonia nitrogen in urine by hydraulic cyclone, which is characterized by comprising the following steps:
adjusting the pH value of stored urine to be more than 9.0, starting an air compressor (8) to introduce air into the device, checking the air tightness of the device, pumping hydrolyzed urine in a material storage tank (1) into a pipeline at the flow rate of 2L/min after the reading of a pressure gauge (5) is stable, enabling the hydrolyzed urine and the air from the air compressor (8) to enter a thin hose (11) of a gas-liquid mixing section through a tee joint (17) for intense convective mass transfer, enabling a gas-liquid mixture after convective mass transfer to enter an inner pipe of a columnar cyclone (9) from a tangential material input port (14) to form spiral upward flow in the inner pipe, enabling the gas to enter a gas phase space at the upper end and be discharged from a top ammonia and air output port (16), enabling degassed liquid to enter an annular gap of an inner pipe and an outer pipe, and enabling the degassed liquid to be discharged from a tangential material output port (15) at the lower end to; the discharged mixed gas of ammonia and air enters the absorption and purification of HCl and NaOH with the concentration of 0.5 mol/L; recovering ammonia in the mixed gas in a HCl storage tank in the form of ammonium chloride; purifying air in the mixed gas by a NaOH storage tank and then discharging the air to the outside; wherein the working temperature is 10-60 ℃, the gas-liquid ratio is 240-1440, and the stripping time is 180 minutes.
The main feature of the present invention is that the ammonia in the hydrolyzed urine solution is usually present in a state of ammonium ion (NH4+) and free ammonia (NH3) in equilibrium, as shown in the formula:
when the pH is neutral, NH3N is predominantly ammonium ion (NH)4 +) In the form of NH when the pH is alkaline3N predominantly as free ammonia (NH)3) The urine is adjusted to have an alkaline pH, so that the equilibrium is shifted in the direction of producing free ammonia. And the ammonia in the liquid can be transferred to a gas phase through gas-liquid mass transfer, when a gas-liquid mixture enters the cyclone, the gas in the mixture migrates to the center due to the existence of centrifugal force and pressure gradient in the spiral ascending flow direction, a rotary air column is formed, and the gas is discharged from an outlet at the upper end of the cyclone, so that the deamination purpose is achieved, and further recovery is realized.
According to the invention, the columnar cyclone is added in the stripping device, and the urine denitrification recovery efficiency is increased by utilizing the degassing capacity of the cyclone. The invention has the advantages of simple flow, convenient operation, less equipment investment, small equipment floor area and no generation of secondary pollution such as solid waste or waste gas and the like, and can be widely applied to the ammonia nitrogen wastewater treatment in various industries besides the recovery of ammonia nitrogen in urine.
Drawings
FIG. 1 is a schematic flow diagram of a hydrocyclone for recovering ammonia nitrogen from urine, according to an embodiment of the present invention; the reference numbers in the drawings correspond to the names: 1-a material storage tank, 2-a high-pressure diaphragm pump, 3-a flow meter, 4-a heat exchanger, 5-a pressure gauge, 6-a valve, 7-a flow meter, 8-an air compressor, 9-a columnar cyclone, 10-a thermometer, 11-a gas-liquid mixing section thin hose, 12-an HCl storage tank, 13-an NaOH storage tank, 14-a material input port, 15-a material output port, 16-an ammonia and air output port, 17-a tee joint, 18-an inner pipe, 19-an outer pipe and 20-a second tee joint.
FIG. 2(a) is a perspective view of a cylindrical cyclone of the present invention;
FIG. 2(b) is a cross-sectional view of a cylindrical cyclone of the present invention;
FIG. 3(a) is a schematic view of the bottom first layer structure of the cylindrical cyclone of the present invention;
FIG. 3(b) is a schematic view of the bottom second level structure of the cylindrical cyclone of the present invention;
FIG. 4 is a schematic diagram of the recovery rate of ammonia nitrogen when the simulated hydrolyzed urine is recovered and treated at different temperatures according to the present invention;
FIG. 5 is a schematic diagram of ammonia nitrogen recovery rate when simulated hydrolyzed urine is recovered and treated at different pH values according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in figure 1, the invention is a device suitable for hydrocyclone recovery of ammonia nitrogen in urine, the body is formed by a columnar cyclone, the columnar cyclone (9) comprises two concentric inner tubes (18) and outer tubes (19), the height of the inner tubes is less than that of the outer tubes, the bottom of the columnar cyclone (9) is formed by double-layer glass plates, the bottom of the inner tube at the first layer of glass plate is provided with a tangential material inlet (14), the tangential material inlet (14) is sequentially connected with a gas-liquid mixing section thin hose (11) and a valve port of a tee joint (17), the bottom of the outer tube at the second layer of glass plate is provided with two tangential material outlets (15), the third valve port of the tee joint (17) is sequentially connected with the heat exchanger (4), the high-pressure diaphragm pump (2) and the bottom outlet of the material storage tank (1); the top of the columnar cyclone (9) is provided with an ammonia and air outlet (16), and a pipeline led out from an outlet at the upper part of the material storage tank is merged into the columnar cyclone through a second tee joint (20) and is sequentially connected with an HCl storage tank (12) and an NaOH storage tank (13).
The device performs gas-liquid separation on a gas-liquid mixture from the thin hose, the separated ammonia and air mixed gas is discharged from the top end of the columnar cyclone, degassed liquid enters an annular gap between the inner pipe and the outer pipe, is discharged from a bottom tangential outlet of the cyclone, and enters the raw material tank for circular stripping. After the gas and the liquid are mixed at the tee joint (17), convective mass transfer is carried out in the thin hose (11).
As shown in the structure and the section of the columnar swirler shown in FIG. 2, the diameter of the inner pipe is 34mm, the height of the inner pipe is 210mm, the diameter of the outer pipe is 49mm, the height of the outer pipe is 400mm, and the top of the outer pipe is provided with a hole. Fig. 3 is a schematic diagram of a material inlet and a material outlet at the bottom of the cyclone, the bottom of the cyclone is made of a double-layer glass plate, and a material inlet (14) and two material outlets (15) are tangentially arranged to respectively realize the inner pipe and the outer pipe of the columnar cyclone (9).
Example one
In the implementation case, simulated completely hydrolyzed urine with the ammonia nitrogen concentration of 7950mg N/L is selected, the pH of the hydrolyzed urine is adjusted to be 12, the gas-liquid ratio is 1200, the temperature is room temperature (25 ℃), the continuous circulation stripping is carried out for 180min, the recovery efficiency of the ammonia nitrogen in the hydrolyzed urine is 78.7%, and the energy consumption in the ammonia nitrogen removal process is 40.8 MJ.Kg-1·N-1。
The removal efficiency η of ammonia is determined from the measurement results:
herein CinAnd CtThe ammonia concentrations at the beginning and at any time of sampling, respectively, are in mol/L.
The energy consumption calculation formula generated in the process of removing ammonia nitrogen in the hydrolyzed urine is as follows:
P＝ΔP×Q
W＝P×t
wherein Q is the volume flow of the reaction liquid, m3S; Δ P is the pressure drop of the treatment unit, Pa; t is the stripping time, h; m is the mass for removing ammonia nitrogen, g; e is energy consumption MJ Kg-1N-1。
Example two
In this embodiment, the simulated completely hydrolyzed urine in the first embodiment is selected, and the operating temperatures are changed to 10 ℃, 20 ℃, 30 ℃, 50 ℃ and 60 ℃ respectively under the conditions of pH 10 and gas-liquid ratio 1200, and the continuous stripping is performed for 180min, as shown in FIG. 4, and the recovery rates of ammonia nitrogen at different temperatures are respectively 33.8%, 49.0%, 65.8%, 75.0%, 88.7% and 93.0%.
EXAMPLE III
In this embodiment, the simulated completely hydrolyzed urine in the first embodiment is selected, the pH of the wastewater is controlled to be 9, 10, 11 and 12 respectively under the condition of room temperature (25 ℃) and gas-liquid ratio of 1200, and the continuous stripping is performed for 180min, as shown in fig. 5, the recovery rates of ammonia nitrogen at different pH are respectively 26.9%, 50.9%, 68.1% and 73.4%.
Claims (4)
1. The device for recycling ammonia nitrogen in urine by hydrocyclone is characterized in that the main body of the device is a cylindrical cyclone (9), the cylindrical cyclone (9) comprises two concentric inner pipes (18) and an outer pipe (19), the height of the inner pipes is smaller than that of the outer pipes, the bottom of the cylindrical cyclone (9) is composed of double-layer glass plates, a tangential material inlet (14) is formed in the bottom of the inner pipe at the first layer of glass plate, the tangential material inlet (14) is sequentially connected with a gas-liquid mixing section thin hose (11) and a valve port of a tee joint (17), two tangential material outlets (15) are formed in the bottom of the outer pipe at the second layer of glass plate and are connected with an inlet at the upper part of a storage tank, an air compressor (8) is connected with the second valve port of the tee joint (17), a pressure gauge and a flow meter are arranged on the connecting pipeline, and the third valve port, A high-pressure diaphragm pump (2) and a bottom outlet of the material storage tank (1); the top of the columnar cyclone (9) is provided with an ammonia and air outlet (16), and a pipeline led out from an outlet at the upper part of the material storage tank is merged into the columnar cyclone through a second tee joint (20) and is sequentially connected with an HCl storage tank (12) and an NaOH storage tank (13).
2. The device for recycling ammonia nitrogen in urine by hydrocyclone according to claim 1, wherein the inner diameter of the thin hose (11) of the gas-liquid mixing section is 5 mm.
3. The device for recycling ammonia nitrogen in urine by hydrocyclone according to claim 1, characterized in that the inner tube has a diameter of 34mm and a height of 210mm, and the outer tube has a diameter of 49mm and a height of 400 mm.
4. The method for recycling ammonia nitrogen in urine by adopting the hydrocyclone of the device of claim 1, characterized in that the pH value of the stored urine is adjusted to be more than 9.0, an air compressor (8) is started to introduce air into the device, the air tightness of the device is checked, when the reading of the pressure gauge (5) is stable, the urine stored in the material storage tank (1) is pumped into a pipeline at the flow rate of 2L/min, the urine and the air from the air compressor (8) enter a gas-liquid mixing section thin hose (11) through a tee joint (17) for strong convective mass transfer, the gas-liquid mixture after the convection mass transfer enters an inner pipe of a columnar cyclone (9) from a tangential material inlet (14) to form spiral ascending flow in the inner pipe, wherein gas enters the upper gas phase space and exits through the top ammonia and air outlet (16), the degassed liquid enters an annular gap between the inner pipe and the outer pipe, is discharged from a lower end tangential material output port (15) and enters a material storage tank (1) for recycling; the discharged mixed gas of ammonia and air is absorbed and purified by HCl and NaOH of 0.5 mol/L; recovering ammonia in the mixed gas in a HCl storage tank in the form of ammonium chloride; purifying air in the mixed gas by a NaOH storage tank and then discharging the air to the outside; wherein the working temperature is 10-60 ℃, the gas-liquid ratio is 240-1440, and the stripping time is 180 min.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147894A (en) * | 2007-10-31 | 2008-03-26 | 重庆工学院 | Hydraulic jetting air cyclone separator |
| CN101935080A (en) * | 2009-06-30 | 2011-01-05 | 罗松阳 | High-concentration ammonia nitrogen blowoff treatment system |
| CN103043809A (en) * | 2012-12-14 | 2013-04-17 | 南京中创水务集团股份有限公司 | Cyclone stripping integration ammonia removal reaction tower |
| CN107585815A (en) * | 2017-09-30 | 2018-01-16 | 浦湘生物能源股份有限公司 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the method and system administered with flue gas of refuse burning NOx pollutants |
| CN111620500A (en) * | 2020-05-12 | 2020-09-04 | 湖南迪亚环境工程有限公司 | Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater |
| AU2020102083A4 (en) * | 2020-07-22 | 2020-10-08 | Guizhou Academy Of Sciences | Ammonia nitrogen emission reduction and wastewater reuse device for urea desorption effluent |
-
2020
- 2020-12-11 CN CN202011457848.9A patent/CN112573607A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101147894A (en) * | 2007-10-31 | 2008-03-26 | 重庆工学院 | Hydraulic jetting air cyclone separator |
| CN101935080A (en) * | 2009-06-30 | 2011-01-05 | 罗松阳 | High-concentration ammonia nitrogen blowoff treatment system |
| CN103043809A (en) * | 2012-12-14 | 2013-04-17 | 南京中创水务集团股份有限公司 | Cyclone stripping integration ammonia removal reaction tower |
| CN107585815A (en) * | 2017-09-30 | 2018-01-16 | 浦湘生物能源股份有限公司 | A kind of high-concentration ammonia nitrogenous wastewater cooperates with the method and system administered with flue gas of refuse burning NOx pollutants |
| CN111620500A (en) * | 2020-05-12 | 2020-09-04 | 湖南迪亚环境工程有限公司 | Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater |
| AU2020102083A4 (en) * | 2020-07-22 | 2020-10-08 | Guizhou Academy Of Sciences | Ammonia nitrogen emission reduction and wastewater reuse device for urea desorption effluent |
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Application publication date: 20210330 |