CN110759520A - Crystallization fluidization process - Google Patents
Crystallization fluidization process Download PDFInfo
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- CN110759520A CN110759520A CN201910966566.2A CN201910966566A CN110759520A CN 110759520 A CN110759520 A CN 110759520A CN 201910966566 A CN201910966566 A CN 201910966566A CN 110759520 A CN110759520 A CN 110759520A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a crystallization fluidization process, which comprises the following steps; step one, adjusting the water quality of sewage in different time periods and types through an adjusting tank until all indexes in the calcium-containing sewage meet the conventional values; conveying the sewage into crystallization granulation fluidization reaction equipment through a pump, weighing and adding a certain-gradation seed crystal through a metering device, weighing and conveying NaOH and Na2CO3 in an alkali liquor storage tank into the crystallization granulation fluidization reaction equipment through the metering device, uniformly mixing, and converting calcium and magnesium ions in the water into insoluble compounds; thirdly, precipitating and attaching the precipitate to the surface of the seed crystal, and discharging the precipitate along with the crystallized particles to be transported outside for desulfurization; conveying the sewage into a mixer, weighing the H2SO4 in the acid liquor storage tank by a metering device, and adding the weighed H2SO4 into the mixer to mix with the sewage to reduce the pH; and step five, conveying the sewage into a softened water pool. The invention has high hardness removal rate, stable effluent quality, wide application range and strong impact resistance.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a crystallization fluidization process.
Background
The development and innovation of the industry not only creates countless working posts to relieve employment pressure at the present stage, but also creates huge economic benefits to promote economic development of China. But the industrial development causes more and more pollution to the environment, and the problems of water resource consumption and pollution caused by industrial wastewater are gradually enlarged. Water is a source of life, is an important component of the human environment, and is one of essential material conditions for human survival and social development. However, water is an unrenewable resource, with the rapid development of social economy and industrial production, the amount and type of industrial sewage are increasing day by day, the sewage treatment equipment lags behind, serious imbalance between industrial production and environmental protection is formed, sewage treatment is improper or directly discharged, adverse effects are caused to human living environment and urban image, and the method is not suitable for urban construction pace. The environment is the foundation of human survival and development, so that industrial economic development and sewage treatment must supplement each other, and sewage is scientifically treated in social production, so that the environmental pollution caused by industrial sewage is reduced, and the social significance is very great;
various soluble cations and anions in water, such As Ca2+, Mg2+, Fe2+, Mn2+, As3+, F-and the like ions, can harm human health once excessive ions exist in the water, currently, an ion exchange method and a lime softening method are generally adopted for removing the metal ions, the conventional ion exchange method regenerates discharged waste brine, the discharge amount is 2-3% of the water yield, the discharged waste brine can cause pollution, and although the lime softening method can reduce the hardness of the water, the technical reaction flow is too long, equipment is complicated, the occupied area is large, the manufacturing cost is high, the lime adding amount is large, the preparation and adding are troublesome, and meanwhile, the hardness reduction of the effluent of the technology is limited, the impact resistance of the effluent is poor, and the sludge treatment amount is large.
Disclosure of Invention
The present invention is directed to a crystallization fluidization process to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a crystallization fluidization process comprising the steps of;
step one, adjusting the water quality of sewage in different time periods and types through an adjusting tank until all indexes in the calcium-containing sewage meet the conventional values, and ensuring the uniformity of the inlet water quality of the sewage;
conveying the sewage into crystallization granulation fluidization reaction equipment through a pump, weighing and adding a certain-gradation seed crystal through a metering device, weighing and conveying NaOH and Na2CO3 in an alkali liquor storage tank into the crystallization granulation fluidization reaction equipment through the metering device, uniformly mixing, and converting calcium and magnesium ions in the water into insoluble compounds;
thirdly, precipitating and attaching the precipitate to the surface of the seed crystal, and discharging the precipitate along with the crystallized particles to be transported outside for desulfurization;
conveying the sewage into a mixer, weighing the H2SO4 in the acid liquor storage tank by a metering device, and adding the weighed H2SO4 into the mixer to mix with the sewage to reduce the pH;
step five, conveying the sewage into a softening water tank to remove hardness in water;
and step six, conveying the sewage into subsequent treatment equipment through a pump for treatment in the next stage.
Preferably, the metering device comprises a tank body, a supporting mechanism, a stirring rod, a feeding hole, a first motor, an upper sealing cover, a shell, a conveying cylinder, a second motor, a spiral conveying shaft, an inner tank, a sliding groove, a weight sensor, an electromagnetic valve, a pressing rod and a sliding block;
the outer wall of the tank body is provided with three supporting mechanisms which are arranged at intervals of 120 degrees, the bottom end of the tank body is provided with a conveying cylinder, the tank body is communicated with the inner cavity of the conveying cylinder, the left side of the conveying cylinder is provided with a shell, the inner cavity of the shell is provided with a second motor, the conveying end of the second motor is locked with a spiral conveying shaft through a coupler, the spiral conveying shaft extends into the inner cavity of the conveying cylinder and is horizontally arranged with the right side surface of the conveying cylinder, the bottom end of the inner cavity of the tank body is provided with a weight sensor, the inner wall of the tank body is provided with a chute in the vertical direction, the inner cavity of the tank body is provided with an inner tank, the outer wall of the inner tank is provided with a sliding block, the sliding block is embedded into the chute, the discharge port of the inner tank extends into the conveying cylinder, the discharge port of the inner tank is provided with an, and the lower surface of depression bar contacts with weighing transducer, the top of the jar body is equipped with the closing cap, the top central point of going up the closing cap puts and is equipped with first motor, the bottom of first motor has the puddler through shaft coupling locking, the puddler extends into the inner chamber of inner tank.
Preferably, the supporting mechanism comprises a supporting seat, a lower supporting leg, a rotating rod, a screw rod and an upper supporting leg;
the top of supporting seat is equipped with the lower limb, the top spiro union of lower limb has the screw rod, and interference fit has the bull stick on the outer wall of screw rod, the top spiro union of screw rod has the one end of going up the supporting leg, the other end and the jar body of going up the supporting leg link to each other.
Preferably, the direction of the threads of the inner cavities of the lower support leg and the upper support leg is opposite.
Preferably, the number of the weight sensors and the number of the pressure rods are two, and the weight sensors and the pressure rods are arranged symmetrically one by one in the vertical direction.
Preferably, the concentration of NaOH and Na2CO3 is 28-32%.
Preferably, the concentration of the H2SO4 is 96-99%.
The crystallization fluidization process provided by the invention has the beneficial effects that:
1. after high-hardness water enters equipment, sewage and a medicament are promoted to be fully mixed through water distribution and medicament distribution, the sewage and the medicament enter a granulation area, an effect of inducing crystallization is achieved through certain hydraulic conditions, calcium carbonate particles generated in the water are discharged out of a softening system, the softened water is sent to a next process system through a system water outlet, the structural design is reasonable, the rising flow rate can reach 60m/h-150m/h through controlling the size of the crystallized calcium carbonate particles, the hardness removal rate is high, the effluent quality is stable, the application range is wide, and the impact resistance is strong.
Drawings
FIG. 1 is a process flow diagram of a crystallization fluidization process according to the present invention;
FIG. 2 is a schematic structural view of a crystallization fluidization process according to the present invention;
FIG. 3 is a schematic view of a metering device for a crystallization fluidization process according to the present invention;
FIG. 4 is a cross-sectional view I of a metering device for a crystallization fluidization process according to the present invention;
FIG. 5 is a cross-sectional view II of a metering device for a crystallization fluidization process according to the present invention;
in the figure: 1. jar body, 2, supporting mechanism, 201, supporting seat, 202, lower support leg, 203, bull stick, 204, screw rod, 205, go up the support leg, 3, puddler, 4, feed inlet, 5, first motor, 6, go up the closing cap, 7, shell, 8, a transport section of thick bamboo, 9, second motor, 10, auger delivery axle, 11, inner tank, 12, spout, 13, weighing sensor, 14, solenoid valve, 15, depression bar, 16, slider.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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, please refer to fig. 1-5, the present invention provides a technical solution: a crystallization fluidization process comprising the steps of;
step one, adjusting the water quality of sewage in different time periods and types through an adjusting tank until all indexes in the calcium-containing sewage meet the conventional values, and ensuring the uniformity of the inlet water quality of the sewage;
conveying the sewage into crystallization granulation fluidization reaction equipment through a pump, weighing and adding a certain-gradation seed crystal through a metering device, weighing and conveying NaOH and Na2CO3 in an alkali liquor storage tank into the crystallization granulation fluidization reaction equipment through the metering device, uniformly mixing, and converting calcium and magnesium ions in the water into insoluble compounds;
thirdly, precipitating and attaching the precipitate to the surface of the seed crystal, and discharging the precipitate along with the crystallized particles to be transported outside for desulfurization;
the chemical crystallization circulation granulation is that chemical agents are added into water, Ca2+ ions in the water are subjected to chemical reaction to generate CaCO3 crystals which are attached to the surface of the seed crystal to form CaCO3 particles; the grain size of the crystallized discharged calcium carbonate particles is 2-3 mm, the content of CaC3 in the particles is more than 98%, the content of SiO2 in the particles is less than 2.48%, the calcium carbonate particles can be recycled, and the CaCO3 particles can be used in occasions such as power plant desulfurization systems and the like, so that the effects of protecting the environment, saving the cost and utilizing the waste are achieved;
conveying the sewage into a mixer, weighing the H2SO4 in the acid liquor storage tank by a metering device, and adding the weighed H2SO4 into the mixer to mix with the sewage to reduce the pH;
step five, conveying the sewage into a softening water tank to remove hardness in water;
conveying the sewage into subsequent treatment equipment through a pump to perform treatment of the next stage;
raw water enters a crystallization granulation fluidization reaction device to be softened, alkali liquor (30% NaOH) and sodium carbonate are metered and added through an alkali liquor tank to enable Ca2+ to be crystallized and attached to the surface of a seed crystal, particles crystallized to a certain degree are discharged to a particle storage tank, new seed crystals are automatically added at the same time, softened water containing Ca2+ and being lower in pH but higher in pH is formed after passing through a fluidized bed softening reactor, when the softened water flows through a mixer, the pH is reduced through metering and adding acid liquor (98% H2SO4) into an acid liquor tank, the softened water enters a downstream water using system, the water recycling rate of the system is 100%, no waste water is discharged, and the Ca2+/Mg2+ removal rate under corresponding conditions can be controlled to be respectively higher than 90% according to different water quality requirements;
the metering device comprises a tank body 1, a supporting mechanism 2, a stirring rod 3, a feeding hole 4, a first motor 5, an upper sealing cover 6, a shell 7, a conveying cylinder 8, a second motor 9, a spiral conveying shaft 10, an inner tank 11, a chute 12, a weight sensor 13, an electromagnetic valve 14, a pressure rod 15 and a slide block 16;
the outer wall of the tank body 1 is provided with three supporting mechanisms 2, and the three supporting mechanisms 2 are arranged at intervals of 120 degrees;
the supporting mechanism 2 comprises a supporting seat 201, a lower supporting leg 202, a rotating rod 203, a screw 204 and an upper supporting leg 205;
the top end of the supporting seat 201 is provided with a lower supporting leg 202, the top end of the lower supporting leg 202 is in threaded connection with a screw 204, the outer wall of the screw 204 is in interference fit with a rotating rod 203, the top end of the screw 204 is in threaded connection with one end of an upper supporting leg 205, the other end of the upper supporting leg 205 is connected with the tank body 1, and the directions of threads of inner cavities of the lower supporting leg 202 and the upper supporting leg 205 are opposite;
the screw 204 can be driven to rotate by rotating the rotating rod 203, and because the threads of the inner cavities of the lower supporting leg 202 and the upper supporting leg 205 are opposite in direction, the lower supporting leg 202 and the upper supporting leg 205 are driven to move in opposite directions, the distance between the lower supporting leg 202 and the upper supporting leg 205 can be adjusted, and therefore the height of the tank body 1 can be adjusted;
the bottom end of the tank body 1 is provided with a conveying cylinder 8, the tank body 1 is communicated with the inner cavity of the conveying cylinder 8, the left side of the conveying cylinder 8 is provided with a shell 7, the inner cavity of the shell 7 is provided with a second motor 9, the conveying end of the second motor 9 is locked with a spiral conveying shaft 10 through a coupler, the spiral conveying shaft 10 extends into the inner cavity of the conveying cylinder 8 and is horizontally arranged with the right side surface of the conveying cylinder 8, the bottom end of the inner cavity of the tank body 1 is provided with a weight sensor 13, the inner wall of the tank body 1 is provided with a chute 12 along the up-down direction, the inner cavity of the tank body 1 is provided with an inner tank 11, the outer wall of the inner tank 11 is provided with a slide block 16, the slide block 16 is embedded into the chute 12, the discharge port of the inner tank 11 extends into the conveying cylinder 8, the discharge port of the inner tank 11 is provided with an electromagnetic valve 14, the, the quantity of the weight sensors 13 and the pressure rods 15 is two, the weight sensors 13 and the pressure rods 15 are symmetrically arranged one by one along the vertical direction, the weight sensors 13, the first motor 5, the second motor 9 and the electromagnetic valve 14 are connected with an external control system, the external control system can control the weight sensors 13 and display related data, and can control the opening and closing of the first motor 5, the second motor 9 and the electromagnetic valve 14, the top end of the tank body 1 is provided with the upper sealing cover 6, the top end center position of the upper sealing cover 6 is provided with the first motor 5, the bottom end of the first motor 5 is locked with the stirring rod 3 through a coupler, and the stirring rod 3 extends into the inner cavity of the inner tank 11;
crystals, alkali liquor or acid liquor can be stored in the inner tank 11, after materials are added into the inner tank 11, the upper sealing cover 6 is fixed with the tank body 1 by a buckle cover, the stirring rod 3 can be driven to rotate by starting the first motor 5, the materials are uniformly mixed and stirred, the inner tank 11 drives the sliding block 16 to move in the sliding chute 12 due to the weight of the materials, so that when the weight sensor 13 is pressed by the pressure rod 15 to measure the weight of the material and the material needs to be added into the crystallization, granulation and fluidization reaction equipment, the electromagnetic valve 14 is opened to enable the discharge hole of the inner tank 11 to be communicated with the conveying cylinder 8, materials are enabled to enter the conveying cylinder 8, the second motor 9 is opened to drive the spiral conveying shaft 10 to rotate to convey the materials, when the weight sensor 13 senses that the weight of the conveyed materials is reached, the first motor 5, the second motor 9 and the electromagnetic valve 14 can be closed to stop the conveying of the materials, and the purpose of quantitative conveying can be achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A crystallization fluidization process, characterized by: comprises the following steps;
step one, adjusting the water quality of sewage in different time periods and types through an adjusting tank until all indexes in the calcium-containing sewage meet the conventional values, and ensuring the uniformity of the inlet water quality of the sewage;
conveying the sewage into crystallization granulation fluidization reaction equipment through a pump, weighing and adding a certain-gradation seed crystal through a metering device, weighing and conveying NaOH and Na2CO3 in an alkali liquor storage tank into the crystallization granulation fluidization reaction equipment through the metering device, uniformly mixing, and converting calcium and magnesium ions in the water into insoluble compounds;
thirdly, precipitating and attaching the precipitate to the surface of the seed crystal, and discharging the precipitate along with the crystallized particles to be transported outside for desulfurization;
conveying the sewage into a mixer, weighing the H2SO4 in the acid liquor storage tank by a metering device, and adding the weighed H2SO4 into the mixer to mix with the sewage to reduce the pH;
step five, conveying the sewage into a softening water tank to remove hardness in water;
and step six, conveying the sewage into subsequent treatment equipment through a pump for treatment in the next stage.
2. A crystallization fluidization process according to claim 1, characterized in that: the metering device comprises a tank body (1), a supporting mechanism (2), a stirring rod (3), a feeding hole (4), a first motor (5), an upper sealing cover (6), a shell (7), a conveying cylinder (8), a second motor (9), a spiral conveying shaft (10), an inner tank (11), a sliding groove (12), a weight sensor (13), an electromagnetic valve (14), a pressing rod (15) and a sliding block (16);
the outer wall of the tank body (1) is provided with three supporting mechanisms (2), the three supporting mechanisms (2) are arranged at intervals of 120 degrees, the bottom end of the tank body (1) is provided with a conveying cylinder (8), the tank body (1) is communicated with the inner cavity of the conveying cylinder (8), the left side of the conveying cylinder (8) is provided with a shell (7), the inner cavity of the shell (7) is provided with a second motor (9), the conveying end of the second motor (9) is locked with a spiral conveying shaft (10) through a coupler, the spiral conveying shaft (10) extends into the inner cavity of the conveying cylinder (8) and is horizontally arranged with the right side surface of the conveying cylinder (8), the bottom end of the inner cavity of the tank body (1) is provided with a weight sensor (13), the inner wall of the tank body (1) is provided with a chute (12) along the up-down direction, the inner cavity of the tank body (1) is provided, and be equipped with slider (16) on the outer wall of inner tank (11), and slider (16) are embedded in spout (12), in the discharge gate of inner tank (11) extended into conveying cylinder (8), and be equipped with solenoid valve (14) in the discharge gate of inner tank (11), the bottom of inner tank (11) is provided with depression bar (15), and the lower surface of depression bar (15) contacts with weighing transducer (13), the top of jar body (1) is equipped with closing cap (6), the top central point of going up closing cap (6) puts and is equipped with first motor (5), there is puddler (3) bottom of first motor (5) through shaft coupling locking, puddler (3) extend into the inner chamber of inner tank (11).
3. A crystallization fluidization process according to claim 2, characterized in that: the supporting mechanism (2) comprises a supporting seat (201), a lower supporting leg (202), a rotating rod (203), a screw rod (204) and an upper supporting leg (205);
the top of supporting seat (201) is equipped with lower supporting leg (202), the top spiro union of lower supporting leg (202) has screw rod (204), and interference fit has bull stick (203) on the outer wall of screw rod (204), the top spiro union of screw rod (204) has the one end of last supporting leg (205), the other end and the jar body (1) of going up supporting leg (205) link to each other.
4. A crystallization fluidization process according to claim 3, characterized in that: the direction of the threads of the inner cavities of the lower supporting leg (202) and the upper supporting leg (205) is opposite.
5. A crystallization fluidization process according to claim 1, characterized in that: the number of the weight sensors (13) and the number of the pressure rods (15) are two, and the weight sensors and the pressure rods are arranged symmetrically one by one along the vertical direction.
6. A crystallization fluidization process according to claim 1, characterized in that: the concentration of NaOH and Na2CO3 is 28-32%.
7. A crystallization fluidization process according to claim 1, characterized in that: the concentration of the H2SO4 is 96-99%.
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| CN117699930A (en) * | 2023-12-25 | 2024-03-15 | 江苏方洋水务有限公司 | Chemical crystallization circulating granulation fluidized bed water treatment device and treatment method thereof |
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