Partitioned Reactive Crystallization Granulation Reactor

Abstract

This invention discloses a zoned reaction crystallization granulation reactor, which has a vertically upward-extending tank-like structure. Internally, it includes a water homogenization zone, a pre-reaction zone, a deep reaction zone, and a clarification zone, connected sequentially from bottom to top. The water homogenization zone is equipped with an aeration device and a dosing device. The dosing device adds chemicals to the incoming water requiring treatment, while the aeration device intermittently aerates the water upwards, ensuring uniform mixing of the water and chemicals under hydraulic and aeration mixing. The incoming water is at atmospheric pressure or a pressurized flow formed by pressure boosting. The bottom of both the pre-reaction and deep reaction zones is equipped with crystal nucleation packing material and has an inlet, outlet, and observation port. The clarification zone has an observation port and an internal filter assembly. In the clarification zone, the incoming water passing through the filter assembly is pumped out by an external product water pump. This invention solves the problems of excessively high suspended solids in the incoming water during water softening, insufficient chemical uniformity during softening, and easy loss of packing material.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, and in particular to a zoned reaction crystallization granulation reactor. Background Technology

[0002] In high-latitude cities or some shale mining cities, the water hardness is high. If it is not pretreated or softened, long-term consumption of hard water can lead to an increased incidence of kidney stones, dry, rough, and itchy skin, and dry, tangled hair.

[0003] In existing water treatment technologies, softening the aforementioned water usually requires a combination of processes such as chemical softening, aeration, filtration, and electrodialysis to ensure the effluent quality. However, these processes still cannot solve the problems of complex procedures, large footprint, and difficult operation.

[0004] Induced crystallization accelerates the formation of crystal nuclei by adding granular solid materials, causing the ions participating in the reaction to accumulate on their surface, resulting in a localized increase in ion concentration to a supersaturated state. Micro-particle solid fillers are added to the reaction system as seed crystals. High-hardness water enters from the bottom of the reactor at a certain flow rate, along with the reaction reagents. By adjusting the supersaturation of the high-hardness water and the upward flow rate of the carrier, pretreated inorganic ions (such as calcium and magnesium ions) are induced to form stable crystals (calcium carbonate crystals) on the carrier surface. Once the crystal particle size reaches a certain level, they are discharged from the tank, thereby effectively reducing the concentration of inorganic calcium and magnesium ions in the water.

[0005] Crystallization granulation softening reactors have been used both domestically and internationally. However, due to structural design issues, problems such as unstable bed, high requirements for controlling suspended solids in the influent, uneven mixing of reagents, low mass transfer efficiency, high residual hardness in the effluent, and easy loss of crystallized particles may occur.

[0006] In existing technologies, a cylindrical body is typically designed with a water distribution zone, a drug distribution zone, a granulation zone, and a clear water zone arranged sequentially from bottom to top inside the body. The inner cylinder divides the granulation zone into three areas: a fluidization zone near the bottom, a separation zone near the top, and a settling zone between the inner cylinder and the main body. The fluidization zone is connected to a seed crystal tube, and the seed crystals circulate between the fluidization zone, the separation zone, and the settling zone. Ions in the water achieve chemical crystallization and cyclic granulation during the flow process. The fluidization zone is also connected to a particle discharge tube, and the particles formed by chemical crystallization and cyclic granulation settle to the bottom in the fluidization zone and are finally discharged from the particle discharge tube.

[0007] However, in practical applications, the existing technology still has the following shortcomings:

[0008] 1. The requirements for controlling suspended solids in the influent are high, and the system itself cannot withstand a high suspended solids load: a high concentration of suspended solids in the influent will affect the effect of the induced crystallization reaction. Therefore, it is necessary to control the concentration of suspended solids in the influent. If the concentration of suspended solids in the influent is high, a separate suspended solids treatment device needs to be added before the crystallization device is fed into the water.

[0009] 2. Uneven mixing and low mass transfer efficiency: The upward hydraulic agitation alone cannot ensure sufficient contact between the influent, reagents and crystal nuclei packing, resulting in uneven mixing and low mass transfer efficiency, which affects the treatment effect of the equipment.

[0010] 3. Packing material is easily lost: The existing crystallization device has a high upward flow velocity, and the crystal nucleus packing material is easily lost with the effluent.

[0011] Therefore, how to solve the problems of excessively high requirements for suspended solids in the influent during the softening process of the crystallization granulation reactor, low treatment efficiency, and easy loss of packing material has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0012] In view of the above-mentioned defects of the prior art, the present invention provides a partitioned reaction crystallization granulation reactor, which aims to solve the defects of excessively high requirements for suspended solids in the influent during the softening process of the crystallization granulation reactor, low treatment efficiency, and easy loss of packing material.

[0013] To achieve the above objectives, the present invention discloses a partitioned reaction crystallization granulation reactor, which has a vertically upward extending tank-like structure and includes, from bottom to top, a water quality homogenization zone, a pre-reaction zone, a deep reaction zone, and a clarification zone.

[0014] The water quality uniformity zone is equipped with an aeration device and a chemical dosing device. The chemical dosing device adds chemicals to the incoming water that needs to be treated, and the aeration device intermittently aerates the water upwards, so that the incoming water and the chemicals are mixed evenly under the stirring of hydraulic force and aeration.

[0015] The inlet water is at normal pressure or is a pressurized water flow formed by pressure boosting;

[0016] Both the pre-reaction zone and the deep reaction zone are equipped with crystal nucleus packing at their bottoms, and each is also equipped with a feed inlet, a discharge outlet, and an observation port.

[0017] The clarification zone is equipped with an observation port and contains a filter assembly.

[0018] Within the clarification zone, the influent water that has passed through the filtration assembly is drawn out by an external product water pump.

[0019] Preferably, the water quality homogenization zone and the pre-reaction zone, the pre-reaction zone and the deep reaction zone, and the deep reaction zone and the clarification zone are all separated by porous partitions and connected by multiple through holes on the corresponding porous partitions.

[0020] More preferably, the porous partition between the pre-reaction zone and the deep reaction zone is provided with a filter cap.

[0021] Preferably, the agent is a coagulant, Na2CO3, and / or NaOH.

[0022] Preferably, the filter assembly includes a front surface for the inlet water to flow into and a back surface for the inlet water to flow out.

[0023] The back water surface water pipe of the filter assembly is connected to the outlet of the water pump, and is connected to an external pressurized air source through an air pipe. The water outlet of the water pump and the pressurized air are used to perform air-water backwashing from the back water surface to the front water surface.

[0024] The sidewall of the clarification zone is provided with a backwash drain near the bottom.

[0025] Preferably, the top is equipped with a pressure relief port that can be opened automatically.

[0026] Preferably, the sidewall of the water quality uniform zone is provided with a water inlet and a sludge discharge / venting outlet near the bottom.

[0027] Preferably, the dosing device includes multiple dosing nozzles disposed near the top of the water quality uniformity zone and spraying downwards, as well as an external dosing port.

[0028] Preferably, the aeration device includes multiple aeration heads disposed near the bottom of the water quality uniformity zone and spraying upwards, as well as external aeration ports;

[0029] The beneficial effects of this invention are:

[0030] This invention incorporates a pre-reaction zone where crystal nuclei react with calcium and magnesium ions in the influent to pre-crystallize, initially reducing the hardness of the influent. Simultaneously, the crystal nucleus bed in the pre-reaction zone prevents some suspended solids from entering the deep reaction zone, ensuring the crystallization and softening effect of the deep reaction zone. For cases with high levels of suspended solids in the influent, an external dosing device can be used to add coagulant into the influent pipe, promoting coagulation of impurities and colloidal particles in the water to remove suspended solids. This solves the problem of high requirements for suspended solids in influent in traditional reactors.

[0031] This invention features a water homogenization zone, integrating a water distribution system, a chemical distribution system, and an aeration system. Under the action of hydraulics and aeration, gas, chemicals, liquid, and crystal nucleation packing are thoroughly mixed. This solves the problems of uneven water distribution and mixing in traditional reactors, thereby improving mass transfer efficiency.

[0032] In this invention, the reactor effluent is discharged through a filter screen and a suction pump. The filter assembly prevents the crystal nucleation packing material from being lost with the effluent and further removes impurities and particles from the water, enhancing the effluent quality. This solves the problem of packing material loss caused by high upward flow velocities in traditional reactors.

[0033] This invention employs an aeration device to continuously or intermittently aerate the reactor. The bubbles wash over the crystal nucleus surface, reducing interference from suspended solids or other ions in the water, and promoting the enrichment and growth of calcium and magnesium ions on the crystal nucleus surface to form stable crystals. Simultaneously, the aeration contains some CO2, which dissolves rapidly in the water under pressure, increasing the concentration of carbonate or bicarbonate ions and promoting the crystal growth of calcium and magnesium ions. This also reduces the amount of reagents needed, saving on operating costs.

[0034] This invention employs a multi-layered baffle structure inside the reactor to cut the bubbles multiple times, reducing the bubble size and forming microbubbles that scour the crystal nucleus surface, thereby improving the bubble scouring effect and the crystallization mass transfer effect.

[0035] The following will further explain the concept, specific structure, and technical effects of the present invention in conjunction with the accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Attached Figure Description

[0036] Figure 1 A schematic diagram of an embodiment of the present invention is shown.

[0037] Figure 2 The diagram shows the internal structure of the water quality homogenization zone, pre-reaction zone, deep reaction zone and clarification zone in one embodiment of the present invention. Detailed Implementation

[0038] Example

[0039] like Figure 1 and Figure 2 As shown, the partitioned reaction crystallization granulation reactor has a vertically upward-extending tank-shaped structure, and its interior includes a water quality homogenization zone 1, a pre-reaction zone 2, a deep reaction zone 3, and a clarification zone 4 connected sequentially from bottom to top.

[0040] The water quality uniformity zone 1 is equipped with an aeration device and a chemical dosing device. The chemical dosing device adds chemicals to the incoming water that needs to be treated, and the aeration device intermittently aerates the water upwards, so that the incoming water and chemicals are mixed evenly under the stirring of hydraulics and aeration.

[0041] The inlet water is at normal pressure or is a pressurized water flow formed by pressure boosting;

[0042] Both the pre-reaction zone 2 and the deep reaction zone 3 are equipped with crystal nucleus packing 9 at the bottom, and both are equipped with a feed inlet 5, a discharge outlet 6 and an observation port 7.

[0043] The clarification zone 4 is equipped with an observation port 7 and a filter assembly 41 inside;

[0044] Within the clarification zone 4, the influent water that has passed through the filter assembly 41 is drawn out by an external product water pump 8.

[0045] In practical applications, the pre-reaction zone 2 and the deep reaction zone 3 have inlet 5, outlet 6 and observation port 7; among them, observation port 7 can be used to observe the growth of crystal nuclei, and inlet 5 and outlet 6 can be used to periodically replace the crystal nucleus filler 9.

[0046] Traditional induced crystallization reactors have high requirements for influent suspended solids. In practical engineering, to achieve the best treatment and crystallization effects of chemical softening, the influent suspended solids should be below 50 mg / L. With high influent suspended solids, some crystals will crystallize on the suspended solids particles during the induced crystallization reaction. Due to the small size or insufficient strength of these particles, they are discharged from the reactor with the water flow, resulting in high effluent turbidity. This increases the burden on subsequent filtration systems and the frequency of backwashing, and to some extent reduces crystallization efficiency and the recovery rate of crystallized products.

[0047] In this device, a dosing system and an aeration system are arranged in the water quality uniformity zone 1. Under the action of hydraulics and aeration, gas, chemicals and liquid are mixed evenly, thereby improving mass transfer efficiency.

[0048] Compared with traditional crystallization reactors, an aeration system is added. Under the action of hydraulics and aeration, the expansion rate of the crystal nucleus packing 9 is increased. The influent, reagents and crystal nucleus packing 9 are fully contacted and mixed, which is conducive to crystal nucleus growth and improves the crystallization softening effect.

[0049] The present invention sets up a pre-reaction zone 2, which can filter the incoming water in advance to remove suspended solids in the incoming water, reduce the adverse effects of suspended solids in the incoming water on the device, and ensure the crystallization and softening effect of the deep reaction zone 3.

[0050] In addition, when the amount of suspended solids in the influent is high, a dosing device can be used to add coagulant into the influent pipe to promote the coagulation reaction of impurities and colloidal particles in the water and remove suspended solids.

[0051] The filter component 41 installed in the clarification zone 4 can enhance the water output effect. The clear water after crystallization and softening is pumped out by the external water pump 8.

[0052] In some embodiments, the water quality homogenization zone 1 and the pre-reaction zone 2, the pre-reaction zone 2 and the deep reaction zone 3, and the deep reaction zone 3 and the clarification zone 4 are all separated by porous partitions and are connected by multiple through holes on the corresponding porous partitions 10.

[0053] In practical applications, the porous baffle 10 not only supports the crystal nucleus packing 9 and prevents the packing from being lost, but also cuts the large bubbles generated by aeration into smaller bubbles, increasing the gas-liquid-solid mixing effect and improving the mass transfer efficiency.

[0054] In some embodiments, the porous partition 10 between the pre-reaction zone 2 and the deep reaction zone 3 is provided with a filter cap.

[0055] In some embodiments, the agent is a coagulant, Na2CO3, and / or NaOH.

[0056] In some embodiments, the filter assembly 41 includes a front surface for water to flow into and a back surface for water to flow out.

[0057] The back water pipe of the filter assembly 41 is connected to the outlet of the water pump 8, and is connected to an external pressurized air source 20 through an air pipe. The water outlet of the water pump 8 and the pressurized air are used to perform air-water backwashing from the back water surface to the front water surface.

[0058] The side wall of the clarification zone 4 is provided with a backwash drain 42 near the bottom.

[0059] In practical applications, the filter component 41 needs to be backwashed with air and water regularly. The backwashing air source is an external aeration blower, and the backwashing water source is the output water from the product water pump 8.

[0060] In some embodiments, a pressure relief port 43 that can be opened automatically is provided at the top.

[0061] In practical applications, the presence of pressure reducing port 43 can reduce the pressure on the device caused by aeration.

[0062] In some embodiments, the sidewall of the water quality uniformity zone 1 is provided with an inlet 15 and a sludge discharge / venting outlet 16 near the bottom.

[0063] In some embodiments, the dosing device includes a plurality of dosing nozzles 11 disposed near the top of the water quality uniformity zone 1 and spraying downwards, and an external dosing port 12.

[0064] In some embodiments, the aeration device includes a plurality of aeration heads 13 disposed near the bottom of the water quality uniformity zone 1 and spraying upwards, and an external aeration port 14.

[0065] The aeration port 14 is connected to an external pressurized air source 20.

[0066] In some embodiments, the external pressurized air source 20 is an aeration blower.

[0067] The crystal nucleus filler used in this invention is an induced crystallization technology, which involves adding suitable induced crystallization carrier particles or induced templates as external inducing substances to the crystallization reaction system. This causes the crystallization products generated by the crystallization reaction to be generated on the surface of the inducing substances, changing the crystallization reaction system from homogeneous nucleation to heterogeneous nucleation and accelerating the crystallization reaction process.

[0068] Induced crystallization technology, used in water treatment, is an improved process of traditional chemical precipitation. After the precipitation reaction is complete, the precipitate settles and separates along with the crystal carrier particles, shortening the chemical precipitation process time while retaining the advantages of rapid reaction and high removal rate of chemical precipitation.

[0069] Moreover, the induced crystallization treatment equipment has a series of advantages when applied to water treatment, such as small footprint, short treatment cycle, less precipitated sludge, low water content, which is beneficial for subsequent treatment or recycling.

[0070] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A zoned reaction crystallization granulation reactor; characterized in that, It has a vertically upward extending tank-like structure, and its interior includes a water quality homogenization zone (1), a pre-reaction zone (2), a deep reaction zone (3), and a clarification zone (4) connected from bottom to top; The water quality uniform zone (1) is equipped with an aeration device and a dosing device. The dosing device adds chemicals to the incoming water that needs to be treated. The aeration device intermittently aerates the water upwards, so that the incoming water and the chemicals are mixed evenly under the stirring of hydraulic force and aeration. The bottom of both the pre-reaction zone (2) and the deep reaction zone (3) is provided with crystal nucleus packing (9), and both are provided with a feed inlet (5), a discharge outlet (6) and an observation port (7); The clarification zone (4) is provided with an observation port (7) and a filter assembly (41) inside; Within the clarification zone (4), the influent water that has passed through the filter assembly (41) is drawn out by an external water pump (8); The water quality uniform zone (1) and the pre-reaction zone (2), the pre-reaction zone (2) and the deep reaction zone (3), and the deep reaction zone (3) and the clarification zone (4) are all separated by porous partitions and are connected by multiple through holes on the corresponding porous partitions (10). The filter assembly (41) includes a front surface for the inlet water to flow into and a back surface for the inlet water to flow out. The back water pipe of the filter assembly (41) is connected to the outlet of the water pump (8), and is connected to an external pressurized air source (20) through an air pipe. The water outlet of the water pump (8) and the pressurized air are used to perform air-water backwashing from the back water surface to the front water surface. The sidewall of the clarification zone (4) is provided with a backwash drain (42) near the bottom; The dosing device includes multiple dosing nozzles (11) disposed near the top of the water quality uniform zone (1) and spraying downwards, as well as an external dosing port (12); The aeration device includes multiple aeration heads (13) that are disposed near the bottom of the water quality uniform zone (1) and spray upwards, as well as external aeration ports (14).

2. The partitioned reaction crystallization granulation reactor according to claim 1, characterized in that, The porous partition (10) between the pre-reaction zone (2) and the deep reaction zone (3) is provided with a filter cap.

3. The partitioned reaction crystallization granulation reactor according to claim 1, characterized in that, The reagent is a coagulant, Na2CO3 and / or NaOH.

4. The partitioned reaction crystallization granulation reactor according to claim 1, characterized in that, The top is equipped with an automatically opening pressure relief port (43).

5. The partitioned reaction crystallization granulation reactor according to claim 1, characterized in that, The sidewall of the uniform water quality zone (1) is provided with an inlet (15) and a sludge discharge / venting outlet (16) near the bottom.

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