Inorganic ion induced crystallization seed self-circulation system and method thereof

Abstract

The present application belongs to the technical field of water treatment, and relates to an inorganic ion induced crystallization seed self-circulation system and a method thereof, comprising an inorganic ion crystallizer, a microcrystal separation device, a seed separation device and a seed regeneration device. The present application can divide the reacted induced seeds into recycled seeds, regenerated seeds and collected seeds according to particle size from small to large, and send the recycled seeds into the inorganic ion crystallizer for recycling. At the same time, the seed regeneration device receives microcrystals and regenerated seeds, processes the microcrystals and regenerated seeds, restores the induced crystallization ability of the microcrystals and regenerated seeds to obtain induced seeds, and sends the induced seeds into the inorganic ion crystallizer for recycling. The collected seeds are dehydrated to realize resource utilization. The present application improves the utilization efficiency of induced seeds and realizes the recycling of seeds while obtaining efficient and stable water treatment effect, and ensures that the induced crystallization water treatment technology can be further applied in the field of complex water treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water treatment, and relates to an inorganic ion induced crystallization seed self-circulation system and a method thereof. BACKGROUND

[0002] Inorganic ion pollution widely exists in water bodies, especially hardness ions represented by calcium and magnesium, fluoride ions, iron ions and manganese ions. When the content of these ions in water is high, not only will it harm human health, but also will cause problems such as scale deposition, heat exchange efficiency reduction and equipment corrosion, and is also a key factor restricting the long-term stable operation of industrial circulating water, boiler water and drinking water. At present, the removal of inorganic ions in water mainly depends on chemical precipitation method, ion exchange method, membrane treatment method, electrochemical method and crystallization method. In recent years, the crystallization method has been widely used in the field of water treatment. The method promotes the target ions in water to produce crystalline substances and adhere to the surface of the seed by adding induced seeds and treatment agents to the water, and relevant engineering cases show that the method has good treatment effect in water quality treatment involving hardness ions, fluoride ions, iron and manganese ions, sulfate ions and bicarbonate ions. Compared with other methods, the method has the advantages of less use of reagents, low sludge production, controllable by-products and low operation cost.

[0003] However, the existing induced crystallization water treatment device still has deficiencies in seed utilization efficiency, equipment structure design, crystallization performance persistence and process adaptability, so that the existing induced crystallization water treatment device cannot balance the treatment efficiency and the utilization efficiency of induced seeds when facing complex composition and variable working conditions in actual engineering scenes, which restricts the further popularization and application of the technology in the field of complex water quality treatment. SUMMARY

[0004] The purpose of the present application is to provide an inorganic ion induced crystallization seed self-circulation system and a method thereof, which can improve the utilization efficiency of induced seeds and realize the recycling of seeds while obtaining efficient and stable water treatment effect.

[0005] To achieve the above purpose, the technical solution provided by the present application is as follows:

[0006] An inorganic ion induced crystallization seed self-circulation system, comprising an inorganic ion crystallizer, a first inlet of the inorganic ion crystallizer being used for introducing raw water, and a second inlet of the inorganic ion crystallizer being used for adding induced seeds, further comprising:

[0007] A microcrystal separation device, the inlet of which is connected with the first outlet of the inorganic ion crystallizer, and the microcrystal separation device is used for separating microcrystals in soft water.

[0008] The seed separation device is connected with the second outlet of the inorganic ion crystallizer through a first inlet, and a second inlet of the seed separation device is used for adding a seed separation agent.

[0009] The seed regeneration device is connected with the first outlet of the microcrystal separation device and the first outlet of the seed separation device through a first inlet, and a second inlet of the seed regeneration device is used for adding a seed recovery agent.

[0010] The application has the following characteristics:

[0011] The microcrystal collection and aggregation device is connected with the second outlet of the microcrystal separation device through an inlet, and is used for collecting and aggregating the microcrystals in the microcrystal separation device and sending the collected and aggregated microcrystals into the seed regeneration device through an outlet.

[0012] The microcrystal collection and aggregation device is one of a slanted tube precipitation device, a slanted plate precipitation device and a vertical vortex tube precipitation device.

[0013] The microcrystal separation device is a cyclone separation device.

[0014] The seed separation device is a group-making granulation fluidized bed.

[0015] The seed separation device is connected with a seed collection device through a second outlet, and the seed collection device is used for receiving and storing the collected seeds from the seed separation device.

[0016] The seed regeneration device is a stirring reaction kettle.

[0017] The second inlet of the seed separation device is connected with a separation agent adding device, and the separation agent adding device is used for adding the seed separation agent into the seed separation device.

[0018] An inorganic ion induced crystallization seed self-circulation method comprises the following steps:

[0019] The raw water is introduced into the inorganic ion crystallizer, and the inorganic ion crystallizer is added with the induced crystal seeds, the raw water is fully contacted and reacted with the induced crystal seeds to obtain soft water containing microcrystals, and the reacted induced crystal seeds are continuously deposited at the bottom of the inorganic ion crystallizer.

[0020] The soft water containing microcrystals is introduced into the microcrystal separation device for separation to obtain soft water and microcrystals, the soft water is discharged, and the microcrystals are collected and aggregated.

[0021] The reacted induced crystal seeds deposited at the bottom of the inorganic ion crystallizer are introduced into the crystal seed separation device, and the crystal seed separation agent is added to the crystal seed separation device, the crystal seed separation device separates the reacted induced crystal seeds into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large under the action of the crystal seed separation agent, and the recycled crystal seeds are sent into the inorganic ion crystallizer for recycling.

[0022] The regenerated crystal seeds and the collected and aggregated microcrystals are introduced into the crystal seed regeneration device, and the crystal seed recovery agent is added to the crystal seed regeneration device, the crystal seed regeneration device processes the regenerated crystal seeds and the microcrystals under the action of the crystal seed recovery agent to recover the induced crystallization ability of the microcrystals and the regenerated crystal seeds to obtain induced crystal seeds, and the induced crystal seeds are sent into the inorganic ion crystallizer for recycling.

[0023] The inorganic ion induced crystallization crystal seed self-circulation system and the method thereof have the following advantages:

[0024] The inorganic ion crystallizer, the microcrystal separation device, the crystal seed separation device and the crystal seed regeneration device are matched, the reacted induced crystal seeds are separated into recycled crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large by the crystal seed separation device, the recycled crystal seeds are sent into the inorganic ion crystallizer for recycling, the microcrystals and the regenerated crystal seeds are received by the crystal seed regeneration device, the microcrystals and the regenerated crystal seeds are processed to recover the induced crystallization ability of the microcrystals and the regenerated crystal seeds to obtain induced crystal seeds, and the induced crystal seeds are sent into the inorganic ion crystallizer for recycling, the high-efficiency and stable water treatment effect is obtained, the utilization efficiency of the induced crystal seeds is improved, and the recycling of the crystal seeds is realized, so that the treatment efficiency and the utilization efficiency of the induced crystal seeds are considered, and the induced crystallization water treatment technology can be further popularized and applied in the field of complex water treatment. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0026] Reference signs:

[0027] 1, inorganic ion crystallizer, 2, microcrystal separation device, 3, microcrystal collection and aggregation device, 4, crystal seed separation device, 5, crystal seed regeneration device, 6, separation agent adding device, 7, crystal seed recovery agent adding device, 8, crystal seed collection device. DETAILED DESCRIPTION

[0028] The technical solutions in the present application will be described clearly and exhaustively below in combination with the drawings. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B: "and / or" in the text is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, in addition, in the description of the embodiments of the present application, "multiple" means two or more than two. The following terms "first" "second" are only for the purpose of description, and cannot be understood as implying or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" "second" can explicitly or implicitly include one or more features.

[0029] As Figure 1As shown, the present application provides a kind of inorganic ion induced crystallization seed self-circulation system, including inorganic ion crystallizer 1, microcrystal separation device 2, crystal seed separation device 4 and crystal seed regeneration device 5, the first inlet of inorganic ion crystallizer 1 is used to introduce raw water, the second inlet of inorganic ion crystallizer 1 is used to add induced seed, inorganic ion crystallizer 1 is used to obtain soft water containing microcrystal by the sufficient contact and reaction of induced seed and raw water, the inlet of microcrystal separation device 2 is connected with the first outlet of inorganic ion crystallizer 1, microcrystal separation device 2 is used to separate microcrystal in soft water, the first outlet of microcrystal separation device 2 is used to discharge treated soft water, the second outlet of microcrystal separation device 2 is used to discharge separated microcrystal, the first inlet of crystal seed separation device 4 is connected with the second outlet of inorganic ion crystallizer 1, the second inlet of crystal seed separation device 4 is used to add seed separation agent, the first outlet of crystal seed separation device 4 is connected with the second inlet of inorganic ion crystallizer 1, crystal seed separation device 4 is used to separate the reacted induced seed deposited in the bottom of inorganic ion crystallizer 1 into reuse seed, regeneration seed and collection seed according to particle size from small to large, and send reuse seed into inorganic ion crystallizer 1 for reuse, the first inlet of crystal seed regeneration device 5 is connected with the first outlet of microcrystal separation device 2, the first outlet of crystal seed separation device 4 respectively, the second inlet of crystal seed regeneration device 5 is used to add seed recovery agent, the first outlet of crystal seed regeneration device 5 is connected with the second inlet of inorganic ion crystallizer 1, crystal seed regeneration device 5 is used to receive microcrystal and regeneration seed, and process microcrystal and regeneration seed, restore the induced crystallization ability of microcrystal and regeneration seed to obtain induced seed, and send induced seed into inorganic ion crystallizer 1 for recycling, the present application separates the reacted induced seed into reuse seed, regeneration seed and collection seed according to particle size from small to large by crystal seed separation device 4, and sends reuse seed into inorganic ion crystallizer 1 for reuse again, at the same time, by crystal seed regeneration device 5, microcrystal and regeneration seed are received, and microcrystal and regeneration seed are processed, the induced crystallization ability of microcrystal and regeneration seed is restored to obtain induced seed, and induced seed is sent into inorganic ion crystallizer 1 for recycling, while obtaining high-efficiency and stable water treatment effect, the utilization efficiency of induced seed is improved, and the recycling of crystal seed is realized, so that the treatment efficiency and the utilization efficiency of induced seed are considered, and the induced crystallization water treatment technology can be further popularized and applied in complex water quality treatment field.

[0030] As Figure 1As shown, the microcrystal collection and aggregation device 3 is connected with the first outlet of the microcrystal separation device 2, and the outlet of the microcrystal collection and aggregation device 3 is connected with the first inlet of the seed regeneration device 5. The microcrystal collection and aggregation device 3 is used for collecting and aggregating the microcrystals in the microcrystal separation device 2, and sending the collected and aggregated microcrystals to the seed regeneration device 5 through the outlet. The microcrystal collection and aggregation device 3 is one of an inclined tube sedimentation device, an inclined plate sedimentation device and a vertical vortex tube sedimentation device, which is convenient for collecting and aggregating the microcrystals.

[0031] Preferably, the microcrystal separation device 2 is a cyclone separator.

[0032] Preferably, the seed separation device 4 is a group granulation fluidized bed. According to the particle size of the induced seed used in the inorganic ion crystallizer 1, a multi-stage fluidized bed in series can be used for multi-stage separation, i.e. one-stage separation, two-stage separation, etc. PAM (polyacrylamide) is used as the seed separation agent. Different structures and seed separation agents are used in the group granulation fluidized bed according to the separation target. The seed with a smaller particle size in each stage of the fluidized bed, i.e. the reused seed, is directly added to the inorganic ion crystallizer 1 for reuse. The seed with a particle size between the reused seed and the collected seed, i.e. the regenerated seed, is sent to the seed regeneration device 5.

[0033] As shown in Figure 1 The second outlet of the seed separation device 4 is connected with a seed collection device 8. The seed collection device 8 is used for receiving the collected seed from the seed separation device 4 and storing it, i.e. the seed with a larger particle size is collected as a product crystalline substance in the seed collection device 8. At the same time, the soft water with the induced seed after the reaction is discharged from the third outlet of the seed separation device 4.

[0034] Preferably, the seed regeneration device 5 is a stirred reaction kettle. An anionic surfactant is used as the seed recovery agent. The regenerated seed and the microcrystal are subjected to processes such as surface roughness and charge property adjustment under the action of the seed recovery agent to recover the induced crystallization ability. The regenerated induced seed is recycled to the inorganic ion crystallizer 1.

[0035] As shown in Figure 1 The first outlet of the microcrystal separation device 2 is used for discharging the soft water. At the same time, the first outlet of the microcrystal separation device 2 is connected with the third inlet of the seed regeneration device 5, which is used for sending part of the soft water to the seed regeneration device 5 to cooperate with the seed recovery agent to process the regenerated seed and the microcrystal.

[0036] As shown in Figure 1As shown, the second inlet of the seed separation device 4 is connected to a separating agent dosing device 6, which stores seed separation agent and is used to add seed separation agent to the seed separation device 4. The second inlet of the seed regeneration device 5 is connected to a seed recovery agent dosing device 7, which stores seed recovery agent and is used to add seed recovery agent to the seed regeneration device 5.

[0037] like Figure 1 As shown, the present invention also provides a method for self-circulation of inorganic ion-induced crystallization seeds, comprising the following steps:

[0038] Raw water is introduced into inorganic ion crystallizer 1, and inducing crystal seeds are added to inorganic ion crystallizer 1. After the raw water and the inducing crystal seeds come into full contact and react, soft water containing microcrystals is obtained. At the same time, the inducing crystal seeds after the reaction are continuously deposited at the bottom of inorganic ion crystallizer 1.

[0039] Soft water containing microcrystals enters the microcrystal separation device 2 for separation, resulting in soft water and microcrystals. The soft water is discharged, and the microcrystals are collected and polymerized.

[0040] The induced crystals deposited at the bottom of the inorganic ion crystallizer 1 after reaction are introduced into the seed separation device 4, and a seed separation agent is added to the seed separation device 4. Under the action of the seed separation agent, the seed separation device 4 separates the induced crystals after reaction into reusable crystals, regenerated crystals and collected crystals according to the particle size from small to large, and sends the reusable crystals into the inorganic ion crystallizer 1 for reuse.

[0041] The regenerated seed crystals and the collected and aggregated microcrystals are introduced into the seed crystal regeneration device 5, and a seed crystal restoration agent is added to the seed crystal regeneration device 5. Under the action of the seed crystal restoration agent, the seed crystal regeneration device 5 processes the regenerated seed crystals and microcrystals to restore the induced crystallization ability of the microcrystals and regenerated seed crystals to obtain induced seed crystals, and then sends the induced seed crystals into the inorganic ion crystallizer 1 for recycling.

[0042] Among them, the microcrystals enter the microcrystal collection and polymerization device 3 for collection and polymerization.

[0043] In this process, the collected seed crystals obtained in the seed crystal separation device 4 are collected as product crystals, and the collected product crystals are dehydrated to obtain crystalline products for use.

[0044] Example 1

[0045] The raw water to be treated was high-hardness water, and this system was used for water softening treatment, reducing the calcium content in the water. 2+ The content is 40 mmol / L, HCO3 - The content is 10 mmol / L, SO4 2-The content is 66mmol / L, the seed crystal is selected from natural gypsum crystal particles, the seed crystal separation agent is selected from PAM, and the seed crystal recovery agent is selected from an anionic surfactant.

[0046] The specific processing steps are as follows:

[0047] The raw water is introduced into the inorganic ion crystallizer 1, and the natural gypsum crystal particles are added to the inorganic ion crystallizer 1, and the raw water and the natural gypsum crystal particles are fully contacted and reacted to obtain soft water containing microcrystals, and at the same time, the reacted natural gypsum crystal particles are continuously deposited at the bottom of the inorganic ion crystallizer 1 after a certain operation period.

[0048] The soft water containing microcrystals is introduced into the microcrystal separation device 2 for separation to obtain soft water and microcrystals, and the soft water is discharged, and the microcrystals are introduced into the microcrystal collection and aggregation device 3 for collection and aggregation.

[0049] The reacted seed crystal deposited at the bottom of the inorganic ion crystallizer 1 is introduced into the seed crystal separation device 4, and PAM is added to the seed crystal separation device 4, and the reacted seed crystal is separated under the action of PAM, and the reacted seed crystal is divided into recycled seed crystal, regenerated seed crystal and collected seed crystal according to particle size from small to large, and the recycled seed crystal is sent to the inorganic ion crystallizer 1 for recycling.

[0050] The regenerated seed crystal and the collected and aggregated microcrystals are introduced into the seed crystal regeneration device 5, and an anionic surfactant is added to the seed crystal regeneration device 5, and the seed crystal regeneration device 5 processes the regenerated seed crystal and the microcrystals under the action of the anionic surfactant, restores the induction crystallization ability of the microcrystals and the regenerated seed crystal to obtain the induction seed crystal, and sends the induction seed crystal to the inorganic ion crystallizer 1 for recycling.

[0051] The collected seed crystal obtained in the seed crystal separation device 4 is introduced into the seed crystal collection device 8 as product crystalline material for collection, and the crystalline material in the seed crystal collection device 8 is CaSO4·2H2O with a purity of ≥99%, and at the same time, the collected product crystalline material is dehydrated to obtain gypsum product for resource utilization.

[0052] The inorganic ion induction crystallization seed crystal self-circulation system and the method thereof have the following advantages:

[0053] Firstly, the seed crystal separation device is used for grading separation, collection and recovery treatment, which promotes the regeneration and utilization of the induction seed crystal, realizes the self-circulation of the induction seed crystal in the system, and has good environmental protection and economic benefits.

[0054] Secondly, the present application can effectively improve the problem of high water turbidity caused by high ion content in raw water, large fluctuation of water quality, and high dosage of seed and softening agent, effectively improve the problem of seed overflow commonly existing in induced crystallization water treatment device, and reduce the dissipation amount of induced seed.

[0055] Thirdly, the present application can effectively reduce the surface roughness of seed, improve the surface charge distribution state of seed, and realize the recovery of induced crystallization performance of seed by treating the seed with seed recovery agent.

[0056] It can be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the present application. In addition, the features and embodiments can be modified to adapt to specific conditions and materials under the guidance of the present application without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of protection of the present application.

Claims

1. An inorganic ion-induced crystallization seed self-circulation system, comprising an inorganic ion crystallizer (1), wherein a first inlet of the inorganic ion crystallizer (1) is used to introduce raw water, and a second inlet of the inorganic ion crystallizer (1) is used to add induced crystal seeds, characterized in that, Also includes: The microcrystal separation device (2) is connected at its inlet to the first outlet of the inorganic ion crystallizer (1) and is used to separate microcrystals in soft water. The seed separation device (4) has a first inlet connected to the second outlet of the inorganic ion crystallizer (1). The second inlet of the seed separation device (4) is used to add seed separation agent. The first outlet of the seed separation device (4) is connected to the second inlet of the inorganic ion crystallizer (1). The seed separation device (4) is used to separate the induced seed crystals deposited at the bottom of the inorganic ion crystallizer (1) into reusable seed crystals, regenerated seed crystals and collected seed crystals according to the particle size from small to large. The reusable seed crystals are then sent back into the inorganic ion crystallizer (1) for reuse. The seed crystal regeneration device (5) has its first inlet connected to the first outlet of the microcrystal separation device (2) and the first outlet of the seed crystal separation device (4). The second inlet of the seed crystal regeneration device (5) is used to add seed crystal restoration agent. The first outlet of the seed crystal regeneration device (5) is connected to the second inlet of the inorganic ion crystallizer (1). The seed crystal regeneration device (5) is used to receive microcrystals and regenerated seed crystals, process the microcrystals and regenerated seed crystals, restore the induced crystallization ability of the microcrystals and regenerated seed crystals to obtain induced seed crystals, and send the induced seed crystals into the inorganic ion crystallizer (1) for recycling.

2. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, A microcrystal collection and polymerization device (3) is provided between the microcrystal separation device (2) and the seed crystal regeneration device (5). The inlet of the microcrystal collection and polymerization device (3) is connected to the second outlet of the microcrystal separation device (2). The microcrystal collection and polymerization device (3) is used to collect and polymerize the microcrystals in the microcrystal separation device (2) and send the collected and polymerized microcrystals into the seed crystal regeneration device (5) through the outlet.

3. The inorganic ion-induced crystallization seed self-circulation system according to claim 2, characterized in that, The microcrystal collection and polymerization device (3) is one of the inclined tube sedimentation device, the inclined plate sedimentation device, and the vertical vortex tube sedimentation device.

4. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, The microcrystalline separation device (2) is a hydrocyclone separation device.

5. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, The seed separation device (4) is an agglomeration and granulation fluidized bed.

6. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, The second outlet of the seed separation device (4) is connected to a seed collection device (8), which is used to receive collected seed crystals from the seed separation device (4) and store them.

7. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, The seed regeneration device (5) is a stirred reactor.

8. The inorganic ion-induced crystallization seed self-circulation system according to claim 1, characterized in that, The second inlet of the seed separation device (4) is connected to a separating agent dosing device (6), which is used to add seed separation agent into the seed separation device (4). The second inlet of the seed regeneration device (5) is connected to a seed recovery agent dosing device (7), which is used to add seed recovery agent into the seed regeneration device (5).

9. A method for self-circulation of inorganic ion-induced crystallization seeds, characterized in that, The system described in any one of claims 1 to 8 comprises the following steps: Raw water is introduced into the inorganic ion crystallizer (1), and inducing crystal seeds are added to the inorganic ion crystallizer (1). After the raw water and the inducing crystal seeds come into full contact and react, soft water containing microcrystals is obtained. At the same time, the inducing crystal seeds after the reaction are continuously deposited at the bottom of the inorganic ion crystallizer (1). Soft water containing microcrystals enters the microcrystal separation device (2) for separation to obtain soft water and microcrystals. The soft water is discharged and the microcrystals are collected and polymerized. After the reaction, the induced crystal seeds deposited at the bottom of the inorganic ion crystallizer (1) are introduced into the seed separation device (4), and a seed separation agent is added to the seed separation device (4). Under the action of the seed separation agent, the seed separation device (4) separates the induced crystal seeds after the reaction into reusable crystal seeds, regenerated crystal seeds and collected crystal seeds according to the particle size from small to large. The reusable crystal seeds are then sent back to the inorganic ion crystallizer (1) for reuse. The regenerated seed crystals and the collected and aggregated microcrystals are introduced into the seed crystal regeneration device (5), and a seed crystal restoration agent is added to the seed crystal regeneration device (5). Under the action of the seed crystal restoration agent, the seed crystal regeneration device (5) processes the regenerated seed crystals and microcrystals to restore the induced crystallization ability of the microcrystals and regenerated seed crystals to obtain induced seed crystals, and sends the induced seed crystals into the inorganic ion crystallizer (1) for recycling.

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