A system and method for removing small molecule organics based on field energy granulation

Abstract

This invention relates to the field of water treatment technology, and particularly to a system and method for removing small-molecule organic matter based on field energy granulation and agglomeration. The system includes an initial mixing section and an electrostatic field enhancement section and a post-mixing section connected sequentially to the initial mixing section. Through the effects of initial mixing and electrostatic field enhancement, medium-sized polymers are first formed, which combine with small-molecule organic matter to form complexes, encapsulating the small-molecule polymers. Then, during post-mixing, coagulants are continuously added and adhere to the initial complexes, forming a coral reef-like surface with a higher zeta potential and a larger specific surface area. Each newly formed surface layer combines with pollutants and covers the previous layer, thereby encapsulating more small-molecule organic matter into the flocs and improving the removal rate of small-molecule organic matter. This solves the problem of low removal rates of small-molecule organic matter in existing coagulation processes, which cannot meet the requirements for wastewater recycling.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a system and method for removing small molecule organic matter based on field energy granulation and agglomeration. Background Technology

[0002] To alleviate the impact of water scarcity on production and daily life, the recycling and reuse of urban wastewater is an important approach. However, the presence of recalcitrant organic matter in secondary effluent from wastewater treatment plants is a major factor limiting wastewater recycling. Coagulation is often used in advanced wastewater treatment, but its removal efficiency for dissolved organic matter, especially small-molecule organic matter, is relatively low. Metal ions, such as aluminum and iron, gradually aggregate and grow from a dissolved state to a colloidal state, and finally to a suspended state, as their concentration and pH increase in water. Coagulation-Clarification (CC) is a commonly used physicochemical treatment method in water and wastewater treatment. By adding chemicals to the water, colloidal particles and small suspended solids aggregate, which are then separated from the water through sedimentation, filtration, and other methods.

[0003] Chinese utility model patent CN219709227U discloses a wastewater treatment tank for uniformly dispensing coagulant. The tank includes a wastewater treatment container with a feeding device on top. This feeding device comprises a support block, a transparent feeding box, scale markings, a feeding pipe, a second solenoid valve, a guide plate, and another support plate. The support block is welded to the top of the wastewater treatment container, and the transparent feeding box is welded to the top of the support block. The outer wall of the transparent feeding box has scale markings, and the feeding pipe is fitted to the bottom of the transparent feeding box. The outer wall of the feeding pipe has a second solenoid valve. This wastewater treatment tank for uniformly dispensing coagulant effectively guides the coagulant to the center of the tank during dispensing. A stirring device then ensures thorough mixing and reaction between the coagulant and the wastewater inside the tank, preventing coagulant accumulation and ensuring a stable input of coagulant for effective wastewater treatment. Chinese utility model patent CN218058554U discloses a wastewater treatment tank for uniformly dispensing coagulant. The coagulant is fed into a feed hopper through a feed pipe. A motor starts, driving a movable rod and conveyor blades to rotate, transporting the material. The material then enters the treatment tank body through a feeding pipe. This design allows for convenient and uniform dispensing of coagulant, avoiding uneven dispensing that could affect wastewater treatment efficiency, meeting operational needs, and improving the tank's efficiency. It is evident that existing coagulation processes generally involve adding the entire dose of coagulant at once, leading to rapid formation of hydrolysis products. The removal mechanism for small-molecule organic matter is primarily chemical adsorption. However, due to the simple structure and limited binding sites of small-molecule organic matter, the electrochemical neutralization ability of the coagulant cannot be utilized to form micro-flocculations; instead, they form soluble complexes with the coagulant, remaining in the water. Therefore, existing coagulation processes have low removal rates for small-molecule organic matter and cannot meet the requirements for wastewater recycling. Summary of the Invention

[0004] To address the problem that existing coagulation processes have low removal rates for small molecule organic matter and cannot meet the requirements for wastewater recycling, this invention provides a system and method for removing small molecule organic matter based on field energy granulation and agglomeration.

[0005] To achieve the above objectives, the present invention employs the following technical solution:

[0006] This invention provides a system for removing small molecule organic matter based on field energy granulation and agglomeration, comprising an initial mixing section, an electrostatic field enhancement section, and a post-mixing section;

[0007] The initial mixing section is connected to the output end of the water to be treated and is used to add coagulant and hydrochloric acid to the water to be treated for initial mixing, and to transport the water to be treated mixed with coagulant and hydrochloric acid after initial mixing to the electrostatic field strengthening section.

[0008] The electrostatic field enhancement section is connected to the initial mixing section and is used to apply an electric field to the water to be treated, which contains coagulant and hydrochloric acid, to form coral reef-like flocs that encapsulate small molecule organic matter.

[0009] The post-mixing section is connected to the electrostatic field strengthening section and is used to add coagulant and alkali to the water to be treated containing coral reef-like flocs carrying small molecule organic matter, so that the volume of the coral reef-like flocs carrying small molecule organic matter increases and they are deposited, and the treated water is output.

[0010] Furthermore, the initial mixing section includes an initial mixing tank, the input end of which is connected to the output end of the water to be treated; the initial mixing tank is connected to a coagulant and hydrochloric acid dosing device; and the initial mixing tank is equipped with a first mixing device and a first pH monitoring device.

[0011] Furthermore, the electrostatic field enhancement section includes a reaction tank connected to the initial mixing section. The reaction tank contains a second mixing device, a zero electrode, and a high-voltage negative electrode. The zero electrode and the high-voltage negative electrode are located on opposite sides of the reaction tank, and an electrostatic field generating device is connected to the zero electrode and the high-voltage negative electrode.

[0012] Furthermore, the post-mixing section includes a post-mixing tank connected to the electrostatic field enhancement section, and a third mixing device is provided inside the post-mixing tank; the post-mixing tank is connected to a coagulant and alkali dosing device, and a second pH monitoring device is connected to the water output end of the post-mixing tank.

[0013] Preferably, the output end of the post-mixing section is connected to a filtration device for filtering the water treated by the post-mixing section.

[0014] The present invention also provides a method for removing small molecule organic matter based on field energy granulation and agglomeration using the above-mentioned system, comprising:

[0015] Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added;

[0016] Add 10% to 30% of the total coagulant to the water to be treated, and add hydrochloric acid to adjust the pH value of the water to be treated for initial mixing to obtain the water to be treated after initial mixing.

[0017] An electrostatic field is applied to the initially mixed water to generate medium polymer molecules that form coral reef flocs, resulting in water containing coral reef flocs.

[0018] The remaining coagulant is added to the water to be treated containing coral reef flocs, and alkali is added to adjust the pH value of the water to be treated containing coral reef flocs. This process is followed by mixing to increase the volume of the coral reef flocs, causing them to settle and thus removing small molecule organic matter from the water to be treated.

[0019] Preferably, the coagulant is polyferric chloride or basic aluminum chloride.

[0020] Preferably, during initial mixing, the concentration of the polyferric chloride after addition is 1-3 mg / L, and the concentration of the basic aluminum chloride after addition is 1-2 mg / L.

[0021] Preferably, the pH of the water to be treated is adjusted to 5-6 after adding hydrochloric acid; the pH of the water containing coral reef flocs is adjusted to 7-8 after adding alkali.

[0022] Preferably, the electrostatic field strength applied to the premixed water to be treated is -20 to -60 kV / m, and the voltage range of the ion bar is -5 to -25 kV.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] This invention discloses a system for removing small molecule organic matter based on field energy granulation and agglomeration. The system includes a primary mixing section, an electrostatic field enhancement section, and a post-mixing section. The primary mixing section is connected to the output end of the water to be treated and is used to add coagulant and hydrochloric acid to the water for primary mixing. The water mixed with coagulant and hydrochloric acid is then transported to the electrostatic field enhancement section. The electrostatic field enhancement section is connected to the primary mixing section and is used to apply an electric field to the water mixed with coagulant and hydrochloric acid to form coral reef-like flocs that encapsulate small molecule organic matter. The post-mixing section is connected to the electrostatic field enhancement section and is used to add coagulant and alkali to the water containing the coral reef-like flocs encapsulating small molecule organic matter, causing the coral reef-like flocs to increase in volume and deposit, resulting in the output of treated water. In the initial stage, the system utilizes electrostatic energy to form medium-sized polymers through the initial mixing section and the electrostatic field enhancement section. These polymers then combine with small-molecule organic matter to form complexes, encapsulating the small-molecule polymers. The subsequent mixing section allows for the continuous addition of coagulants, which adhere to the initial complexes to form a coral reef-like surface with a higher zeta potential and a larger specific surface area. Each newly formed surface combines with pollutants and covers the previous surface, thereby encapsulating more small-molecule organic matter into the flocs and improving the removal rate. This avoids the defects of traditional coagulation, where the one-time addition of coagulants leads to the rapid formation of polymer clusters and reduces the number of binding sites.

[0025] The initial mixing section includes an initial mixing tank, the input end of which is connected to the output end of the water to be treated. The initial mixing tank is connected to a coagulant and hydrochloric acid dosing device. Inside the initial mixing tank are a first mixing device and a first pH monitoring device. Through the initial mixing tank and the first mixing device, the water to be treated, coagulant, and hydrochloric acid can be mixed evenly. The first pH monitoring device can detect the amount of hydrochloric acid added to achieve the optimal pH value for floc formation, ensuring the removal rate of small molecule organic matter.

[0026] The electrostatic field enhancement section includes a reaction tank connected to the initial mixing section. The reaction tank contains a second mixing device, a zero electrode, and a high-voltage negative electrode. The zero electrode and the high-voltage negative electrode are located on opposite sides of the reaction tank, and an electrostatic field generator is connected to each of them. Electrical energy generated by the electrostatic field generator is transferred to the zero electrode and the high-voltage negative electrode to create an electric field, causing the water to be treated between the zero electrode and the high-voltage negative electrode to form coral reef-like flocs, carrying small organic molecules.

[0027] The post-mixing section includes a post-mixing tank connected to the electrostatic field enhancement section, and a third mixing device is installed inside the post-mixing tank. The post-mixing tank is connected to a coagulant and alkali dosing device, and a second pH monitoring device is connected to the water output end of the post-mixing tank. The post-mixing tank allows for the addition of remaining coagulant, layering and encapsulating small molecule organic matter, thereby improving the removal rate of small molecule organic matter and forming large-volume coral reef-like flocculent precipitates, thus achieving effective removal of small molecule organic matter to be treated.

[0028] The output end of the post-mixing section is connected to a filtration device, which can filter the water treated by the post-mixing section and improve the recyclability of the treated water.

[0029] This invention also provides a method for removing small molecule organic matter using the above-mentioned system based on field energy granulation and agglomeration. This method involves obtaining the quality and quantity of the wastewater to be treated and determining the total amount of coagulant to be added; adding 10% to 30% of the total coagulant to the wastewater, and adding hydrochloric acid to adjust the pH value of the wastewater for initial mixing, resulting in pre-mixed wastewater; applying an electrostatic field to the pre-mixed wastewater to generate medium-polymer molecules that form coral reef flocs, resulting in wastewater containing coral reef flocs; adding the remaining coagulant to the wastewater containing coral reef flocs, and adding alkali to adjust the pH value of the wastewater containing coral reef flocs for post-mixing, which increases the volume of the coral reef flocs and causes them to settle, thereby removing small molecule organic matter from the wastewater. Compared to traditional coagulation processes, this method has a higher removal rate of small molecule organic matter, lower equipment modification costs, and the wastewater treated by this method is more conducive to recycling and reuse.

[0030] The coagulant is polyferric chloride or basic aluminum chloride, which are widely available and inexpensive.

[0031] During initial mixing, the concentration of the polyferric chloride after addition is 1-3 mg / L, and the concentration of the basic aluminum chloride after addition is 1-2 mg / L, which can effectively ensure the initial encapsulation of small molecule organic matter by the coral reef-like flocs.

[0032] Adding hydrochloric acid to adjust the pH of the water to be treated to 5-6 ensures the formation of coral reef-like flocs; adding alkali to adjust the pH of the water containing coral reef flocs to 7-8 ensures the recycling of the treated water.

[0033] The electrostatic field strength applied to the initially mixed water to be treated is -20 to -60 kV / m, and the voltage range of the ion bar is -5 to -25 kV. The electrostatic field energy increases the binding force between the binding sites and small molecule organic matter, i.e., electrostatic attraction, thereby increasing the density of the flocs and rapidly inducing the formation of coral reef flocs. This results in coral reef-shaped flocs having a higher Zeta potential and specific surface area, allowing small molecule organic matter to be entrained into the interior of the coral reef-shaped flocs. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a system for removing small molecule organic matter based on field energy granulation and agglomeration according to the present invention.

[0035] Figure 2 This is a flowchart of a method for removing small molecule organic matter based on field energy granulation and agglomeration according to the present invention.

[0036] Among them, 1-initial mixing section, 1.1-coagulant and hydrochloric acid dosing device, 1.2-first mixing device, 1.3-first pH monitoring device, 1.4-initial mixing tank, 2-electrostatic field enhancement section, 2.1-electrostatic field generating device, 2.2-zero electrode, 2.3-high voltage negative electrode, 2.4-second mixing device, 2.5-reaction tank, 3-post-mixing section, 3.1-coagulant and alkali dosing device, 3.2-third mixing device, 3.3-second pH monitoring device, 3.4-post-mixing tank. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0042] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0043] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0044] Example 1

[0045] See Figure 1 The present invention provides a system for removing small molecule organic matter based on field energy granulation and agglomeration, characterized in that it includes a primary mixing section 1, an electrostatic field strengthening section 2, and a post-mixing section 3;

[0046] The initial mixing section 1 is connected to the output end of the water to be treated and is used to add coagulant and hydrochloric acid to the water to be treated for initial mixing, and to transport the water to be treated mixed with coagulant and hydrochloric acid to the electrostatic field strengthening section 2.

[0047] The electrostatic field strengthening section 2 is connected to the initial mixing section 1 and is used to apply an electric field to the water to be treated, which contains coagulant and hydrochloric acid, to form coral reef-like flocs that encapsulate small molecule organic matter.

[0048] The post-mixing section 3 is connected to the electrostatic field strengthening section 2 and is used to add coagulant and alkali to the water to be treated containing coral reef-like flocs carrying small molecule organic matter, so that the volume of the coral reef-like flocs carrying small molecule organic matter increases and they are deposited, and the treated water is output.

[0049] In the initial stage, the system utilizes electrostatic energy to form medium-sized polymers through the initial mixing section 1 and the electrostatic field enhancement section 2. These polymers then combine with small-molecule organic matter to form complexes, encapsulating the small-molecule polymers. Through the post-mixing section 3, coagulants are continuously added and adhere to the initial complexes, forming a coral reef-like surface with a higher zeta potential and a larger specific surface area. Each newly formed surface combines with pollutants and covers the previous surface, thereby encapsulating more small-molecule organic matter into the flocs, improving the removal rate, and better meeting the requirements for wastewater recycling and reuse.

[0050] Example 2

[0051] See Figure 1 The present invention provides a system for removing small molecule organic matter based on field energy granulation and agglomeration, characterized in that it includes a primary mixing section 1, an electrostatic field strengthening section 2, and a post-mixing section 3;

[0052] The initial mixing section 1 is used to add coagulant and hydrochloric acid to the water to be treated for initial mixing, and to transport the water to be treated mixed with coagulant and hydrochloric acid to the electrostatic field enhancement section 2. The initial mixing section 1 includes an initial mixing tank 1.4, the input end of which is connected to the output end of the water to be treated; the initial mixing tank 1.4 is connected to a coagulant and hydrochloric acid dosing device 1.1; the initial mixing tank 1.4 is equipped with a first mixing device 1.2 and a first pH value monitoring device 1.3.

[0053] The electrostatic field enhancement section 2 is used to apply an electric field to the water to be treated, which contains coagulant and hydrochloric acid, to form coral reef-like flocs that encapsulate small organic molecules. The electrostatic field enhancement section 2 includes a reaction tank 2.5 connected to the initial mixing tank 1.4. The reaction tank 2.5 contains a second mixing device 2.4, a zero electrode 2.2, and a high-voltage negative electrode 2.3. The zero electrode 2.2 and the high-voltage negative electrode 2.3 are located on both sides of the reaction tank 2.5, and an electrostatic field generating device 2.1 is connected to the zero electrode 2.2 and the high-voltage negative electrode 2.3.

[0054] The post-mixing section 3 is used to add coagulant and alkali to the water to be treated containing coral reef-like flocs carrying small molecule organic matter, so that the volume of the coral reef-like flocs carrying small molecule organic matter increases and they are deposited, and the treated water is output. The post-mixing section 3 includes a post-mixing tank 3.4 connected to the reaction tank 2.5. A third mixing device 3.2 is installed inside the post-mixing tank 3.4. The post-mixing tank 3.4 is connected to a coagulant and alkali dosing device 3.1. The water output end of the post-mixing tank 3.4 is connected to a second pH monitoring device 3.3 and a filtration device for filtering the water treated by the post-mixing section 3.

[0055] In water treatment, the water to be treated, along with a portion of coagulant, is first added to the primary mixing tank 1.4 for initial mixing, and hydrochloric acid is added to adjust the pH to optimal flocculation conditions. Then, the water to be treated, mixed with some coagulant, is introduced into the reaction tank 2.5, where an electrostatic field is applied to induce the formation of coral reef-like flocs, which encapsulate small organic molecules in the water. The water containing these coral reef-like flocs is then introduced into the post-mixing tank, where the remaining coagulant is added and the pH is adjusted to neutral with alkali, forming a coral reef-like surface with a higher zeta potential and a larger specific surface area. Each newly formed surface layer binds to pollutants and covers the previous layer, thereby encapsulating more small organic molecules into the flocs, improving the removal rate and better meeting the requirements for wastewater recycling. Preferably, the water to be treated passes through the primary mixing section 1 for 1–2 minutes, through the electrostatic field enhancement section 2 for 1–2 minutes, and through the post-mixing section 3 for 10–15 minutes.

[0056] Example 3

[0057] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0058] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added;

[0059] S2: Add 10% to 30% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH value of the water to be treated, and perform initial mixing to obtain the water to be treated after initial mixing;

[0060] S3: Apply an electrostatic field to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs.

[0061] S4: Add the remaining coagulant to the water containing coral reef flocs, and add alkali to adjust the pH of the water containing coral reef flocs for post-mixing, so that the coral reef flocs increase in volume and settle, thereby removing small molecule organic matter from the water. The coagulant is polyferric chloride or basic aluminum chloride.

[0062] Compared to traditional coagulation processes, this method has a higher removal rate for small molecule organic matter, lower equipment modification costs, and the wastewater treated by this method is more conducive to recycling and reuse.

[0063] Example 4

[0064] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0065] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is polyferric chloride or basic aluminum chloride;

[0066] S2: Add 10% to 30% of the total coagulant dosage to the water to be treated, and add hydrochloric acid to adjust the pH value of the water to be treated for initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 1 to 3 mg / L, and the concentration of the basic aluminum chloride after addition is 1 to 2 mg / L; after adding hydrochloric acid, adjust the pH value of the water to be treated to 5 to 6; preferably, the addition method is wet addition, and the addition method is pressure addition or using a dosing pump to directly draw the chemical solution from the chemical solution tank / box and add it into the chemical solution water pipe.

[0067] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -20 to -60 kV / m, the voltage range of the ion bar is -5 to -25 kV, the zero electrode voltage is 0, and the high voltage negative electrode is adjusted according to the corresponding field strength.

[0068] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water containing coral reef flocs for post-mixing, so that the volume of coral reef flocs increases and they settle, thus removing small molecule organic matter from the water. The pH of the water containing coral reef flocs adjusted after adding alkali is 7-8. The addition is continuous to ensure that the coral reef flocs are suspended in the mixed solution fluid.

[0069] Compared to traditional coagulation processes, this method has a higher removal rate for small molecule organic matter, lower equipment modification costs, and the wastewater treated by this method is more conducive to recycling and reuse.

[0070] Example 5

[0071] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0072] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is polyferric chloride;

[0073] S2: Add 15% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH of the water to be treated to 5 for initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 1.5 mg / L.

[0074] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, resulting in water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -40kV / m, and the voltage range of the ion bar is -20kV.

[0075] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water to 7. Then, perform post-mixing to increase the volume of the coral reef flocs, cause them to settle, and remove small molecule organic matter from the water.

[0076] Example 6

[0077] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0078] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is polyferric chloride;

[0079] S2: Add 25% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH of the water to be treated to 5.5 for initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 2.5 mg / L;

[0080] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -30kV / m, and the voltage range of the ion bar is -15kV.

[0081] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water to 7. Then, perform post-mixing to increase the volume of the coral reef flocs, cause them to settle, and remove small molecule organic matter from the water.

[0082] Example 7

[0083] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0084] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is basic aluminum chloride;

[0085] S2: Add 10% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH of the water to be treated to 6, and perform initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 1 mg / L;

[0086] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -20kV / m, and the voltage range of the ion bar is -5kV.

[0087] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water to 7. Then, perform post-mixing to increase the volume of the coral reef flocs, cause them to settle, and remove small molecule organic matter from the water.

[0088] Example 8

[0089] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0090] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is basic aluminum chloride;

[0091] S2: Add 13% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH of the water to be treated to 5 for initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 1.3 mg / L;

[0092] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -30kV / m, and the voltage range of the ion bar is -10kV.

[0093] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water to 7. Then, perform post-mixing to increase the volume of the coral reef flocs, cause them to settle, and remove small molecule organic matter from the water.

[0094] Example 9

[0095] See Figure 2 This invention provides a method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the above system, comprising:

[0096] S1: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; the coagulant is polyferric chloride;

[0097] S2: Add 30% of the total amount of coagulant to the water to be treated, and add hydrochloric acid to adjust the pH of the water to be treated to 5, and perform initial mixing to obtain the water to be treated after initial mixing; during initial mixing, the concentration of the polyferric chloride after addition is 3 mg / L;

[0098] S3: An electrostatic field is applied to the initially mixed water to generate medium polymer molecules to form coral reef flocs, thus forming water containing coral reef flocs; the field strength of the electrostatic field applied to the initially mixed water is -60kV / m, and the voltage range of the ion bar is -25kV.

[0099] S4: Add the remaining coagulant to the water containing coral reef flocs and add alkali to adjust the pH of the water to 7. Then, perform post-mixing to increase the volume of the coral reef flocs, cause them to settle, and remove small molecule organic matter from the water.

[0100] In summary, this invention provides a system and method for removing small molecule organic matter based on field energy granulation and agglomeration. By adding the flocculant in stages and using the effect of an electrostatic field, the flocculents encapsulate the small molecule organic matter layer by layer, thereby improving the removal rate of small molecule organic matter in water treatment. The system has a simple structure, is easy to operate, has low investment costs, and provides good water and wastewater treatment effects, which can better meet the requirements for recycling after wastewater treatment.

[0101] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A system for removing small molecule organic matter based on field energy granulation and agglomeration, characterized in that, It includes a primary mixing section (1), an electrostatic field strengthening section (2), and a post-mixing section (3). The initial mixing section (1) is connected to the output end of the water to be treated and is used to add coagulant and hydrochloric acid to the water to be treated for initial mixing. The water to be treated mixed with coagulant and hydrochloric acid after initial mixing is transported to the electrostatic field strengthening section (2), which includes an initial mixing tank (1.4). The input end of the initial mixing tank (1.4) is connected to the output end of the water to be treated. The initial mixing tank (1.4) is connected to a coagulant and hydrochloric acid dosing device (1.1). The initial mixing tank (1.4) is equipped with a first mixing device (1.2) and a first pH monitoring device (1.3). The electrostatic field strengthening section (2) is connected to the initial mixing section (1) and is used to apply an electric field to the water to be treated mixed with coagulant and hydrochloric acid to form coral reef-like flocs carrying small molecule organic matter. It includes a reaction tank (2.5) connected to the initial mixing section (1). The reaction tank (2.5) is equipped with a second mixing device (2.4), a zero electrode (2.2) and a high-voltage negative electrode (2.3). The zero electrode (2.2) and the high-voltage negative electrode (2.3) are located on both sides of the reaction tank (2.5), and an electrostatic field generating device (2.1) is connected to the zero electrode (2.2) and the high-voltage negative electrode (2.3). The post-mixing section (3) is connected to the electrostatic field strengthening section (2) and is used to add coagulant and alkali to the water to be treated containing coral reef-like flocs carrying small molecule organic matter, so that the volume of the coral reef-like flocs carrying small molecule organic matter increases and they are deposited, and the treated water is output. The post-mixing tank (3.4) is connected to the electrostatic field strengthening section (2). A third mixing device (3.2) is provided inside the post-mixing tank (3.4). The post-mixing tank (3.4) is connected to a coagulant and alkali dosing device (3.1). The water output end of the post-mixing tank (3.4) is connected to a second pH monitoring device (3.3).

2. The system for removing small molecule organic matter based on field energy granulation and agglomeration according to claim 1, characterized in that, The output end of the post-mixing section (3) is connected to a filter device for filtering the water treated by the post-mixing section (3).

3. A method for removing small molecule organic matter using field energy-based granulation and agglomeration based on the system of claim 1 or 2, comprising: Obtain the water quality and treatment volume of the wastewater to be treated, and determine the total amount of coagulant to be added; Add 10% to 30% of the total coagulant to the water to be treated, and add hydrochloric acid to adjust the pH value of the water to be treated for initial mixing to obtain the water to be treated after initial mixing. An electrostatic field is applied to the initially mixed water to generate medium polymer molecules that form coral reef flocs, resulting in water containing coral reef flocs. The remaining coagulant is added to the water containing coral reef flocs, and alkali is added to adjust the pH value of the water containing coral reef flocs. This process is followed by mixing to increase the volume of the coral reef flocs, causing them to settle and thus removing small molecule organic matter from the water.

4. The method for removing small molecule organic matter based on field energy granulation and agglomeration according to claim 3, characterized in that, The coagulant is polyferric chloride or basic aluminum chloride.

5. The method for removing small molecule organic matter based on field energy granulation and agglomeration according to claim 4, characterized in that, During initial mixing, the concentration of the polyferric chloride after addition is 1-3 mg / L, and the concentration of the basic aluminum chloride after addition is 1-2 mg / L.

6. The method for removing small molecule organic matter based on field energy granulation and agglomeration according to claim 3, characterized in that, After adding hydrochloric acid, the pH of the water to be treated is adjusted to 5-6; after adding alkali, the pH of the water containing coral reef flocs is adjusted to 7-8.

7. The method for removing small molecule organic matter based on field energy granulation and agglomeration according to any one of claims 3-6, characterized in that, The electrostatic field strength applied to the premixed water to be treated is -60 to -20 kV / m, and the voltage range of the ion bar is -25 to -5 kV.

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