Inlet water purification system of anaerobic reactor

Abstract

The invention discloses a water inlet purification system of an anaerobic reactor. The water inlet purification system comprises a purification barrel, a water inlet pipeline, a water outlet pipeline, an online detector and a backwashing pipeline, the purification barrel comprises a first barrel, a second barrel and a third barrel which are sequentially connected in series through a pipeline, a first filler for removing suspended matters in water is arranged in the first barrel, a second filler for removing sulfur ions in water is arranged in the second barrel, and a third filler for removing calcium ions in water is arranged in the third barrel; the water inlet pipeline is connected with the hydrolysis acidification pool and the first barrel and is used for inputting wastewater into the first barrel, and the water outlet pipeline is connected with the third barrel and the anaerobic reactor and is used for inputting the treated wastewater into the anaerobic reactor; the online detector is connected with the third barrel body and is used for detecting the treated wastewater; and the backwashing pipeline is connected with the third barrel body so as to carry out backwashing on the interior of the third barrel body. The method can effectively remove suspended solids, sulfur ions and calcium ions in the wastewater.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an anaerobic reactor influent purification system. Background Technology

[0002] Anaerobic biological wastewater treatment is a low-cost technology that combines high-concentration wastewater treatment with energy recovery and utilization. Anaerobic biological treatment technology has a history of over a century, with breakthroughs achieved particularly in the last 20-30 years in anaerobic biological reaction mechanisms and reactor design, making it the dominant technology for treating high-concentration organic wastewater. As people's understanding of the principles of anaerobic treatment technology continues to grow, various high-efficiency anaerobic reactors have emerged, providing an important means for the industrial treatment of various industrial and domestic wastewaters.

[0003] Reconstituted tobacco, also known as tobacco flakes, is a sheet-like recycled product made from tobacco dust, stems, and broken tobacco leaves using a papermaking process. Its wastewater contains a large amount of fine fibers similar to pulp and paper wastewater, as well as low-molecular-weight and non-volatile organic acids, nicotine, tar, phenols, calcium, sulfur, and other substances. Anaerobic reactors have high requirements for water quality; generally, the calcium ion content should not exceed 50 mg / L, otherwise it easily leads to granular sludge calcification. However, the calcium ion content in reconstituted tobacco wastewater is generally 600-1000 mg / L, significantly exceeding the requirements of anaerobic reactors. The fine suspended solids content in reconstituted tobacco wastewater is approximately 2000-4000 mg / L. Conventional physical filtration methods such as drum filters and sedimentation can only remove larger suspended solids, failing to remove fine suspended solids. Using flocculants requires pH adjustment, and residual ions can negatively impact the anaerobic reactor. Anaerobic reactors generally require a fine suspended solids content of less than 500 mg / L. Excessive fine suspended solids adhere to the outer surface of granular sludge, reducing the contact area with wastewater, causing hollow granular sludge, an increased VSS / TSS ratio, and ultimately leading to easy breakage and washing out of the granular sludge. The reconstituted tobacco pulping process, due to the addition of aluminum sulfate as an adjuvant, also results in a high sulfate content in the wastewater, approximately 600-1500 mg / L, with a COD of approximately 3000-5000 mg / L. Anaerobic reactors require a COD:SO4 ratio of... 2- ≥5, otherwise it will inhibit the activity of methanogens, resulting in decreased anaerobic removal efficiency and sludge loss. The combined effect of these factors will seriously affect the removal efficiency of the anaerobic reactor and cause sludge loss.

[0004] Currently, there are no technologies for the simultaneous removal of fine suspended solids, sulfur-containing substances, and calcium ions. Based on research on the content of related substances in reconstituted tobacco wastewater, this invention has developed equipment and processes for the removal of these three substances, thereby improving the removal efficiency of anaerobic reactors and reducing the loss of anaerobic particulate sludge. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the anaerobic biological treatment of recycled tobacco wastewater by providing an anaerobic reactor influent purification system. This system is used for the pretreatment of influent to remove calcium ions, sulfur ions, and suspended solids from the water. The purified wastewater effectively prevents calcification of anaerobic granular sludge, reduces sludge breakage caused by suspended solids adhering to granular sludge, effectively reduces sludge loss, and improves COD removal rate, thus contributing to quality improvement, cost reduction, and efficiency enhancement.

[0006] This invention is achieved through the following technical solution: This invention provides an anaerobic reactor influent purification system, comprising a purification cylinder, an influent pipe, an effluent pipe, an online monitoring instrument, and a backwashing pipe. The purification cylinder includes a first cylinder, a second cylinder, and a third cylinder connected in series via pipes. The first cylinder contains a first packing material for removing suspended solids from the water, the second cylinder contains a second packing material for removing sulfide ions from the water, and the third cylinder contains a third packing material for removing calcium ions from the water. The influent pipe connects a hydrolysis acidification tank to the first cylinder and is used to input wastewater into the first cylinder. The effluent pipe connects the third cylinder to the anaerobic reactor and is used to input treated wastewater into the anaerobic reactor. The online monitoring instrument is connected to the third cylinder and is used to monitor the treated wastewater. The backwashing pipe is connected to the third cylinder and is used to backwash the interior of the third cylinder.

[0007] In the above technical solution, three cylinders are connected in series and each is equipped with one of three types of packing materials. During operation, wastewater from the hydrolysis acidification tank is introduced into the first cylinder via the inlet pipe. The purified wastewater is then introduced into the anaerobic reactor from the third cylinder via the outlet pipe. The first packing material removes fine suspended solids, the second removes sulfur ions, and the third removes calcium ions. These three types of packing materials do not interfere with each other; if any one has low removal efficiency, it can be replaced individually to ensure the removal effect and utilization efficiency of the packing materials. Simultaneously, an online sulfide and calcium hardness detector is installed near the outlet pipe to monitor the calcium and sulfur removal efficiency of the water. The purification system in this application is used for the pretreatment of the anaerobic reactor influent to remove suspended solids, sulfur ions, and calcium ions from the wastewater. The purified wastewater effectively prevents calcification of anaerobic granular sludge, reduces sludge breakage caused by suspended solids adhering to granular sludge, effectively reduces sludge loss, and improves COD removal rate, contributing to quality improvement, cost reduction, and efficiency enhancement.

[0008] As a preferred embodiment of the present invention, a centrifugal pump is provided on the water inlet pipeline for sending wastewater from the hydrolysis acidification tank into the first cylinder.

[0009] As a preferred embodiment of the present invention, a water outlet valve is provided on the water outlet pipeline to control the water flow rate.

[0010] As a preferred embodiment of the present invention, the water inlet pipe is connected to the lower end of the first cylinder, and the water outlet pipe is connected to the upper end of the third cylinder.

[0011] As a preferred embodiment of the present invention, the online detector is connected to the third cylinder at a position near its upper end.

[0012] As a preferred embodiment of the present invention, the backwashing pipeline is connected to the third cylinder at a position near its lower end.

[0013] As a preferred embodiment of the present invention, the backwashing pipeline is provided with a backwashing pump, a pipeline mixer and a backwashing valve for inputting backwashing water into the third cylinder.

[0014] As a preferred embodiment of the present invention, the first filler is a multi-layer filter cotton plus sand and gravel.

[0015] In a preferred embodiment of the present invention, the second filler is activated carbon.

[0016] As a preferred embodiment of the present invention, the third filler is an ion exchange resin or an aminocarboxylic acid chelating resin.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention utilizes three cylinders connected in series, each equipped with one of three types of packing materials. The first packing material removes fine suspended solids from the water, employing multi-layered filter cotton and sand to trap and remove suspended solids while maintaining a certain flow rate. The second packing material removes sulfur ions, utilizing the adsorption properties of activated carbon, which is effective in removing organic matter, odors, and both organic and inorganic sulfur ions. The third packing material removes calcium ions, using ion exchange resin or aminocarboxylic acid chelating resin. These three packing materials can be customized based on their different filtration characteristics and cleaning / replacement features to ensure the removal effect and utilization efficiency of the materials used. Simultaneously, an online sulfide and calcium hardness detector is installed near the outlet pipe to monitor the calcium and sulfur removal efficiency of the water. The purification system in this invention is used for the pretreatment of the anaerobic reactor influent to remove suspended solids, sulfur ions, and calcium ions from the wastewater. The purified wastewater effectively prevents calcification of anaerobic granular sludge, reduces the adhesion of suspended solids to granular sludge causing sludge breakage, effectively reduces sludge loss, and improves COD removal rate, contributing to quality improvement, cost reduction, and efficiency enhancement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall anaerobic reactor influent purification system of the present invention; Figure 2 This is a top view schematic diagram of the anaerobic reactor influent purification system of the present invention.

[0019] The attached diagram shows the markings and corresponding component names: 1-Inlet pipe, 2-Centrifugal pump, 3-First cylinder, 4-Second cylinder, 5-Third cylinder, 6-First packing, 7-Second packing, 8-Third packing, 9-Outlet pipe, 10-Outlet valve, 11-Online detector, 12-Backwash valve, 13-Pipeline mixer, 14-Backwash pump. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0022] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0025] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0026] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0027] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0029] Please refer to Figure 1 and Figure 2This application provides an anaerobic reactor influent purification system, comprising a purification cylinder, an influent pipe 1, an effluent pipe 9, an online monitoring instrument 11, and a backwashing pipe. The purification cylinder includes a first cylinder 3, a second cylinder 4, and a third cylinder 5 connected in series via pipes. The first cylinder 3 contains a first packing material 6 for removing suspended solids from the water, the second cylinder 4 contains a second packing material 7 for removing sulfur ions from the water, and the third cylinder 5 contains a third packing material 8 for removing calcium ions from the water. The influent pipe 1 connects a hydrolysis acidification tank to the first cylinder 3 and is used to input wastewater into the first cylinder 3. The effluent pipe 9 connects the third cylinder 5 to the anaerobic reactor and is used to input treated wastewater into the anaerobic reactor. The online monitoring instrument 11 is connected to the third cylinder 5 and is used to monitor the treated wastewater. The backwashing pipe is connected to the third cylinder 5 and is used to backwash the interior of the third cylinder 5.

[0030] This application employs a system with three cylindrical bodies connected in series, each equipped with one of three types of packing materials. During operation, wastewater from the hydrolysis acidification tank is introduced into the first cylindrical body 3 via the inlet pipe 1. The purified wastewater is then introduced into the anaerobic reactor from the third cylindrical body 5 via the outlet pipe 9. The first packing material 6 removes fine suspended solids, the second packing material 7 removes sulfur ions, and the third packing material 8 removes calcium ions. These three types of packing materials do not interfere with each other; if any one has low removal efficiency, it can be replaced individually to ensure the removal effect and utilization efficiency of the packing materials. Simultaneously, an online sulfide and calcium hardness detector 11 is installed near the outlet pipe 9 to monitor the removal efficiency of calcium and sulfur in the water. The purification system in this application is used for pretreatment of the anaerobic reactor influent to remove suspended solids, sulfur ions, and calcium ions from the wastewater. The purified wastewater effectively prevents calcification of anaerobic granular sludge, reduces the adhesion of suspended solids to granular sludge causing sludge breakage, effectively reduces sludge loss, and improves COD removal rate, contributing to quality improvement, cost reduction, and efficiency enhancement.

[0031] It should be noted that since the water in the hydrolysis acidification tank is a mixture of the influent and the anaerobic return water, the water in the tank enters the anaerobic reactor. Because the anaerobic reactor converts sulfate ions into sulfides, the wastewater is treated in the hydrolysis acidification tank. The mixed wastewater is introduced into this purification system to facilitate the removal of sulfide ions.

[0032] According to some embodiments of this application, a centrifugal pump 2 is installed on the inlet pipe 1. The centrifugal pump 2 is used to send wastewater from the hydrolysis acidification tank into the first cylinder 3 through the inlet pipe 1. The flow rate of the centrifugal pump 2 on the inlet pipe 1 can be adjusted according to the water volume, and the flow rate of the centrifugal pump 2 can be set between 50 m³ / h and 140 m³ / h. It should be noted that an inlet valve can also be installed on the inlet pipe 1.

[0033] According to some embodiments of this application, an outlet valve 10 is provided on the outlet pipe 9 to control the outlet flow rate. Since the outlet pipe 9 connects the third cylinder 5 and the anaerobic reactor and is used to input the treated wastewater into the anaerobic reactor, the outlet flow rate can be controlled by providing an outlet valve 10 on the outlet pipe 9.

[0034] According to some embodiments of this application, the inlet pipe 1 is connected to the lower end of the first cylinder 3, and the outlet pipe 9 is connected to the upper end of the third cylinder 5. Since the first cylinder 3, the second cylinder 4, and the third cylinder 5 in this application are all vertically arranged, the inlet pipe 1 is connected to the lower end of the first cylinder 3, the upper end of the first cylinder 3 is connected to the upper end of the second cylinder 4 through a pipe, the lower end of the second cylinder 4 is connected to the lower end of the third cylinder 5 through a pipe, and the outlet pipe 9 is connected to the upper end of the third cylinder 5. In this way, the wastewater is purified sequentially by the first packing material 6, the second packing material 7, and the third packing material 8.

[0035] It should be noted that, to facilitate the filling and replacement of the first packing 6, the second packing 7, and the third packing 8, packing replacement valve covers are designed at the upper and lower parts of the first cylinder 3, the second cylinder 4, and the third cylinder 5. In this application, the first cylinder 3 has a radius of 0.68m, a height of 1m, and an effective volume of 1.5m³; the second cylinder 4 has a radius of 0.38m, a height of 1m, and an effective volume of 0.5m³; and the third cylinder 5 has a radius of 0.68m, a height of 1m, and an effective volume of 1.5m³.

[0036] According to some embodiments of this application, the online detector 11 is connected to the third cylinder 5 near its upper end. Since the third cylinder 5 has a bottom inlet and an upper outlet, and the purified wastewater is located near its upper end, connecting the online detector 11 at this position allows for simultaneous detection of the calcium and sulfur ion content in the purified wastewater, thereby monitoring the calcium and sulfur removal efficiency of the water. Specifically, the online detector 11 can be connected at a position one-third of the distance from the upper end of the third cylinder 5.

[0037] According to some embodiments of this application, the backwashing pipeline is connected to the third cylinder 5 near its lower end. Since the third cylinder 5 has a bottom inlet and an top outlet, and the lower end of the third cylinder 5 is the lowest position of the third packing material 8, connecting the backwashing pipeline at this position allows for better flushing of the third packing material 8. Specifically, the backwashing pipeline can be connected at a position one-third of the way from the lower end of the third cylinder 5.

[0038] It should be noted that this application can also design separate backwashing pipelines for the first cylinder 3 and the second cylinder 4, so as to backwash the first packing 6 and the second packing 7 as well. The backwashing pipelines of the above three cylinders are independent of each other, and their respective backwashing operations can be started according to different filtration characteristics and cleaning and replacement characteristics to ensure the removal effect and utilization efficiency of the packing.

[0039] According to some embodiments of this application, the backwash pipeline is provided with a backwash pump 14, a pipeline mixer 13 and a backwash valve 12 for inputting backwash water into the third cylinder 5.

[0040] In this application, the water quality of the purified wastewater is monitored in real time by an online monitoring instrument 11 and the data is transmitted. Once abnormal data is detected, the backwash pump 14 can be started or the packing can be replaced to ensure the removal effect.

[0041] According to some embodiments of this application, the first packing material 6 is a multi-layer filter cotton plus sand. The first packing material 6 is used to remove fine suspended solids in the water, utilizing the multi-layer filter cotton and sand to trap and remove suspended solids in the water while ensuring a certain flow rate.

[0042] The filter cotton and sand can be arranged in multiple alternating layers, with the sand particle size being 2-4mm and the filter cotton pore size being 50-200μm, to ensure the interception effect of fine suspended matter.

[0043] According to some embodiments of this application, the second packing material 7 is activated carbon. The second packing material 7 is used to remove sulfur ions, utilizing the adsorption properties of activated carbon, which is particularly effective in removing organic matter, odors, and organic and inorganic sulfur ions. The activated carbon described above can be granular activated carbon.

[0044] According to some embodiments of this application, the third packing material 8 is an ion exchange resin or an aminocarboxylic acid chelating resin. The third packing material 8 is used to remove calcium ions, utilizing the ion exchange resin or aminocarboxylic acid chelating resin to remove calcium ions from the water. The adsorption and filtration effects of these two resins remove calcium substances from the wastewater.

[0045] Ion exchange resins are high-molecular polymers with a network structure, typically spherical particles composed of an insoluble resin matrix and active groups. They can achieve functions such as dehydration, catalysis, and decolorization through exchange reactions with ions in solution. Based on chemical properties, they are classified into four types: strongly acidic, weakly acidic, strongly basic, and weakly basic. Based on pore structure, they are classified into gel-type and macroporous types.

[0046] Aminocarboxylic acid chelating resins use cross-linked polymers as a backbone and introduce aminocarboxylic acid functional groups through chemical bonds to form a multi-coordination site structure. The core mechanism is that amino and carboxylic acid groups form stable chelates with metal ions, achieving selective adsorption.

[0047] Since the third packing 8 can be regenerated and its function restored, for example by washing and regenerating with acid or alkali, and has a high reuse rate, it is preferable to set a backwashing pipeline on the third cylinder 5 to backwash the third packing 8 with acid or alkali.

[0048] The working principle of this application is as follows: The mixed wastewater in the hydrolysis acidification tank is introduced into the purification system of this application. Specifically, the wastewater enters the first cylinder 3 through the inlet pipe 1, is purified by the first packing material 6, enters the second cylinder 4, is purified by the second packing material 7, enters the third cylinder 5, is purified by the third packing material 8, and enters the anaerobic reactor through the outlet pipe 9. The first packing material 6 removes fine suspended solids, the second packing material 7 removes sulfur ions, and the third packing material 8 removes calcium ions. These three types of packing materials do not affect each other. When the removal efficiency of any one of them is low, it can be replaced or flushed separately to ensure the removal effect and utilization efficiency of the packing materials.

[0049] When water flows through the online monitoring instrument 11, it automatically begins to detect the water quality of the purified wastewater, mainly measuring the removal efficiency of calcium and sulfur in the purified water, and transmits the water quality data to the control center. When supervisors detect abnormal data, they can start the backwash pump 14 or replace the packing material to ensure the removal effect of the packing material.

[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An anaerobic reactor influent purification system, characterized in that, The system includes a purification cylinder, an inlet pipe, an outlet pipe, an online monitoring instrument, and a backwashing pipe. The purification cylinder comprises a first cylinder, a second cylinder, and a third cylinder connected in series via pipes. The first cylinder contains a first packing material for removing suspended solids from the water, the second cylinder contains a second packing material for removing sulfide ions from the water, and the third cylinder contains a third packing material for removing calcium ions from the water. The inlet pipe connects the hydrolysis acidification tank to the first cylinder and is used to input wastewater into the first cylinder. The outlet pipe connects the third cylinder to the anaerobic reactor and is used to input the treated wastewater into the anaerobic reactor. The online monitoring instrument is connected to the third cylinder and is used to monitor the treated wastewater. The backwashing pipeline is connected to the third cylinder and is used to backwash the inside of the third cylinder.

2. The anaerobic reactor influent purification system according to claim 1, characterized in that, A centrifugal pump is installed on the water inlet pipeline to send wastewater from the hydrolysis acidification tank into the first cylinder.

3. The anaerobic reactor influent purification system according to claim 1, characterized in that, A water outlet valve is installed on the water outlet pipeline to control the water flow rate.

4. The anaerobic reactor influent purification system according to claim 1, characterized in that, The water inlet pipe is connected to the lower end of the first cylinder, and the water outlet pipe is connected to the upper end of the third cylinder.

5. The anaerobic reactor influent purification system according to claim 1, characterized in that, The online detector is connected to the third cylinder near its upper end.

6. The anaerobic reactor influent purification system according to claim 1, characterized in that, The backwashing line is connected to the third cylinder near its lower end.

7. The anaerobic reactor influent purification system according to claim 1, characterized in that, The backwash pipeline is equipped with a backwash pump, a pipeline mixer, and a backwash valve, which are used to input backwash water into the third cylinder.

8. The anaerobic reactor influent purification system according to claim 1, characterized in that, The first packing material is a multi-layer filter cotton plus sand and gravel.

9. The anaerobic reactor influent purification system according to claim 1, characterized in that, The second filler is activated carbon.

10. The anaerobic reactor influent purification system according to claim 1, characterized in that, The third filler is an ion exchange resin or an aminocarboxylic acid chelating resin.

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