Anaerobic reaction device for industrial wastewater pretreatment

Abstract

The utility model provides an anaerobic reaction device for industrial wastewater pretreatment, which is characterized in that a water distribution component is arranged in a device body and consists of a shell and a plurality of water distribution components, the shell adopts a cone structure, the caliber of the shell is gradually increased from a water inlet to a water outlet, and water distribution holes are distributed on the cone-shaped shell in a concentric circle form. Due to the conical design and the layout of the water distribution holes, the speed of water flow is gradually reduced from the water inlet to the water outlet, so that solid particles can settle under the influence of gravity, and the impact of the water flow on the water distribution holes is also reduced due to the reduction of the flow speed, so that the risk of blockage is greatly reduced. Meanwhile, the backflow system is not provided with an additional power device, the negative pressure formed when the inflow water flow passes through the narrow throat of the Venturi tube is utilized, the outflow water is automatically pumped back to the device body, and the efficient backflow effect is achieved. Through the design, the structure of the device is simplified, the energy consumption is reduced, and the treatment efficiency of the high-concentration organic wastewater is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of industrial wastewater treatment, and particularly relates to an anaerobic reaction device for industrial wastewater pretreatment. BACKGROUND

[0002] The petrochemical industry occupies a pivotal position in China, and it is the backbone of China's economy. The industry provides raw materials for a large number of synthetic organic chemicals and synthetic materials, and has a long production chain and a wide variety of products. However, the wastewater treatment problem of the industry is very tricky, because the composition of the wastewater is complex, often containing high concentrations of non-degradable toxic pollutants, which can easily cause water environmental and ecological risks. In particular, the wastewater discharge of some petrochemical equipment is large, with high content of toxic and non-degradable pollutants, making treatment difficult. It often causes impact on the comprehensive wastewater treatment plant of the refining and chemical integrated enterprise (park), affecting the stable treatment of the treated water to meet the standards, and has been a difficult point in the treatment of petrochemical industry wastewater for a long time.

[0003] In petrochemical wastewater treatment, anaerobic biological technology as a pretreatment method can realize the recycling of energy. Although anaerobic biological technology has undergone three stages of technological innovation, it still faces many problems in actual operation, such as low treatment load, insufficient gas-liquid-solid three-phase separation, and easy occurrence of faults (such as acidification, slow microbial multiplication, etc.) during system operation. These problems lead to low treatment efficiency and unstable system operation.

[0004] Patent CN 217437862 U discloses an improved EGSB reactor, which has a granular sludge layer and a suspended sludge layer at the lower end and the middle of the reactor box, respectively, and a three-phase separator is provided at the upper end of the suspended sludge layer. The upper end of the box is provided with a pulse tank through a mounting frame, and the lower end of the pulse tank is connected with a pulse main pipe vertically passing through the inside of the box. The pulse tank + pulse water distributor can ensure uniform water distribution and mud-water mixing effect. However, the patent does not consider the problem of water distribution system blockage, and the water return system of the patent uses an internal reflux pump to provide power, which increases energy consumption and investment cost. UTILITY MODEL CONTENT

[0005] In view of the problems of the existing water distribution system, such as easy to be blocked, high energy consumption and poor treatment effect, the utility model provides an anaerobic reaction device for industrial wastewater pretreatment, a water distribution assembly composed of a shell and a plurality of water distribution holes is arranged in the water distribution area of the device body, the shell is a conical structure, the caliber gradually increases from the water inlet to the water outlet, and the water distribution holes are uniformly distributed on the shell. Thanks to the design of the conical structure and the water distribution holes, the water flow rate naturally slows down during the flow process from the water inlet to the water outlet, and the solid particles can be settled under the action of gravity, and such design can also effectively avoid the blockage of the water distribution holes. In addition, the backflow system provided by the utility model does not need to additionally increase power equipment, utilizes the special design of the Venturi tube, and naturally sucks the outlet water into the device body by the negative pressure generated when the inlet water passes through the throat section, thereby realizing efficient backflow. This design not only simplifies the system structure, but also significantly reduces the energy consumption, and further reduces the operation cost.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An anaerobic reaction device for industrial wastewater pretreatment, comprising: a device body, which comprises a water distribution area, a reaction area and a water outlet area from bottom to top inside; a water distribution assembly arranged in the water distribution area, comprising a shell and a plurality of water distribution holes, the shell is a conical structure with the caliber gradually expanding from the water inlet to the water outlet; a plurality of water distribution hole groups are arranged on the shell in a concentric circular manner from the water inlet to the water outlet, each water distribution hole group comprises a plurality of water distribution holes uniformly distributed along the circumferential direction of the central axis of the shell; a plurality of inner cylinders are arranged vertically in the reaction area; a three-phase separation assembly is arranged in the water outlet area and used for separating gas and solid in the outlet water.

[0008] In some embodiments, the included angle between the water distribution hole and the central axis of the shell is 45 degrees.

[0009] In some embodiments, the inner cylinder is a truncated cone, the ratio of the small caliber to the large caliber of the inner cylinder is 5:7-6:7, and the included angle between the generatrix of the inner cylinder and the horizontal direction is 75-85 degrees.

[0010] In some embodiments, the diameter ratio of the inner cylinder to the reaction area is 0.5-0.7.

[0011] In some embodiments, the three-phase separation assembly comprises: a separation plate group and a gas collecting cover, the separation plate group comprises a plurality of inclined plates arranged in parallel and at equal intervals, and a plurality of fluid channels are formed between the inclined plates; the gas collecting cover is located at the top of the separation plate group to collect the gas separated by the separation plate group.

[0012] In some embodiments, the included angle between the inclined plate and the horizontal direction is 55 degrees; and the gas collecting cover is a cone, and the included angle between the inclined side of the cone and the horizontal direction is 55 degrees.

[0013] In some embodiments, the anaerobic reaction device further comprises a gas collecting pipeline in communication with the gas outlet of the gas collecting cover.

[0014] In some embodiments, the anaerobic reaction device further comprises an external reflux unit and a water inlet pipeline in communication with the water inlet of the device body, the external reflux unit comprising a Venturi tube and a reflux pipeline, the Venturi tube being arranged on the water inlet pipeline and comprising an inlet section, a throat section and a diffusion section in sequence, the inlet section and the diffusion section both being tapered towards the throat section; one end of the reflux pipeline being in communication with the water outlet of the device body, and the other end being in communication with the throat section.

[0015] In some embodiments, the water outlet area is provided with a baffle and a water outlet weir, the baffle being arranged outside the water outlet weir, and the upper edge height of the baffle being lower than the upper edge height of the water outlet weir.

[0016] In some embodiments, the device body is a cylinder or a square; and / or, a movable cover plate is mounted on the top of the device body; and / or, the anaerobic reaction device further comprises a base arranged at the bottom of the device body, and the base is made of stainless steel or carbon steel.

[0017] Compared with the prior art, the anaerobic reaction device has the following beneficial effects:

[0018] 1. The shell of the water distributor of the anaerobic reaction device is designed in a unique conical structure, and a plurality of water distribution holes are uniformly distributed on the shell. Due to the characteristics of the conical structure, the diameter gradually increases from the water inlet to the water outlet, the water flow slows down when entering from the small diameter, so that the particulate matter can naturally settle under the action of gravity and be separated before the water flow is dispersed to a wider area. At the same time, the gradual reduction of the flow rate from the water inlet to the water outlet also helps to achieve uniform distribution of the flow field. This unique structural design and the distribution of the water distribution holes significantly reduce the risk of blockage of the water distribution holes by solid particles.

[0019] 2. The anaerobic reaction device does not need to increase any external power equipment to realize reflux. By adding a Venturi tube, when the water flows through the throat section with a small cross-sectional area, the flow rate increases and the pressure decreases, generating a negative pressure that sucks the water outlet into the Venturi tube. After mixing with the water inlet, they enter the water distribution assembly together. This non-powered reflux design not only simplifies the system structure, but also significantly reduces energy consumption and operating costs.

[0020] 3、The utility model discloses a plurality of vertical arrangement's inner tube is arranged in the reaction area, these inner tubes can effectively guide flow to water body, ensure the efficient flow and uniform distribution of fluid in the reaction area, thereby improve the processing efficiency of the whole anaerobic reaction device;

[0021] 4、The utility model discloses a three -phase separation subassembly is provided with a plurality of parallel and equidistant inclined plate, forms a plurality of fluid passageway, and the design of inclined plate helps to improve the fluid dynamics condition, reduces the vortex and turbulence, makes liquid and solid particle can more effectively separate, simultaneously, gas can smoothly ascend to the gas collecting cover. BRIEF DESCRIPTION OF DRAWINGS

[0022] The utility model is further illustrated below in connection with the drawings and examples.

[0023] Figure 1 The structure schematic diagram of anaerobic reaction device provided by the utility model is provided;

[0024] Figure 2 The structure schematic diagram of water distribution assembly provided by the utility model is provided;

[0025] Figure 3 The structure schematic diagram of another implementation of water distribution assembly provided by the utility model is provided;

[0026] Figure 4 The structure schematic diagram of three -phase separation subassembly provided by the utility model is provided.

[0027] The meaning of the mark symbol in the drawing is as follows:

[0028] 1 - device body;2 - shell;201 - water inlet;202 - water outlet;3 - water distribution hole;4 - inner tube;5 - inclined plate;6 - gas collecting cover;7 - gas collection pipeline;8 - water inlet pipe;9 - venturi;10 - return pipe;11 - baffle;12 - water outlet weir;13 - water outlet pipe;14 - vent pipe. DETAILED DESCRIPTION

[0029] As Figure 1 Indicated, the utility model provides an anaerobic reaction device for industrial wastewater pretreatment, including device body 1 and setting water distribution assembly, a plurality of inner tubes 4 and three -phase separation subassembly in device body 1, specifically:

[0030] The inside of device body 1 is equipped with water distribution area, reaction area and water outlet area from bottom to top.

[0031] Water distribution assembly is set up in the water distribution area, including shell 2 and a plurality of water distribution holes 3, the taper structure of the shell 2 is gradually enlarged from water inlet 201 to water outlet 202, the small caliber of the taper structure is the water inlet 201 of the water distributor shell 2, that is Figure 1As shown, shell 2 is an inverted cone shape.

[0032] Furthermore, such as Figure 2 As shown, the housing 2 has several water distribution hole groups arranged concentrically from the water inlet 201 to the water outlet 202. Each water distribution hole group includes multiple water distribution holes 3 evenly distributed circumferentially along the central axis of the housing 2.

[0033] Preferably, the number of the above-mentioned water distribution components can be selected according to the water distribution area.

[0034] Several inner cylinders 4 are arranged vertically within the reaction zone. These inner cylinders 4 serve two main functions: firstly, they act as flow guides, effectively directing the fluid along a predetermined path and reducing eddies and dead zones within the reaction zone; secondly, they stabilize the flow field by dividing the entire reaction area into smaller units, resulting in more uniform fluid flow within each unit and reducing instability in the large-scale flow field. Furthermore, the inner cylinders 4 reduce backmixing. Their structural design helps extend the fluid's residence time within the reaction zone, allowing sufficient time for the wastewater and anaerobic sludge to react, thus preventing backmixing caused by rapid mixing and further improving reaction efficiency and effectiveness.

[0035] Preferably, the inner cylinder 4 is coaxially arranged with the device body 1.

[0036] The aforementioned three-phase separation component is located in the effluent zone and is used to separate gas (biogas) and solids (sludge particles) from the water.

[0037] Furthermore, the angle between the two inclined sides of the inverted conical shell 2 and the central axis of the shell 2 is 45°, therefore the angle between the water distribution hole 3 and the central axis of the shell 2 is 45°.

[0038] Preferred, such as Figure 3 As shown, the two side walls of the inverted conical shell 2 have N levels of steps distributed along the central axis. Each step includes a first step surface and a second step surface that are perpendicular to each other. The first step surface is arranged in the horizontal direction, and the second step surface is arranged in the vertical direction. Multiple water distribution holes 3 are evenly arranged on the second step surface of each step. At this time, the water distribution holes 3 are parallel to the central axis of the shell 2.

[0039] In some embodiments, the inner cylinder 4 is frustoconical, the ratio of the small diameter to the large diameter of the inner cylinder 4 is 5:7 to 6:7, and the angle between the generatrix of the inner cylinder 4 and the horizontal direction is 75° to 85°.

[0040] Furthermore, the diameter ratio of the inner cylinder 4 to the reaction zone is 0.5 to 0.7.

[0041] Furthermore, the number of inner cylinders 4 can be set according to the actual mixing situation of the device body 1, preferably 1 to 3. The inner cylinders 4 are arranged vertically in the device body 1, and the distance between adjacent inner cylinders 4 is greater than the height of the inner cylinder 4.

[0042] Furthermore, the device body 1 is also provided with multiple hollow brackets, which are used to fix the inner cylinder 4 to the inner wall of the device body 1.

[0043] In some embodiments, the above-described three-phase separation assembly includes: a separation plate assembly and a gas collection hood 6, such as... Figure 1 and Figure 4 As shown, the separation plate assembly includes several parallel and equidistant inclined plates 5, forming multiple fluid channels between the inclined plates 5. When the fluid flows between the inclined plates 5, the flow velocity slows down due to the action of the inclined plates 5, causing the suspended solid particles to settle under the action of gravity. The fluid continues to flow along the inclined plates 5, gradually separating from the solid particles. Since the gas has a lower density, it naturally rises and is easily separated through the fluid channels.

[0044] The gas collection hood 6 is located at the top of the separation plate assembly and is used to collect the gas separated by the separation plate assembly. Specifically, when the water rises from the reaction zone and flows into the separation plate assembly, the anaerobic sludge and biogas are separated from the water under the guidance of the inclined plate 5. In this process, the anaerobic sludge settles back to the reaction zone, while the released biogas is effectively captured and collected by the gas collection hood 6.

[0045] Furthermore, the angle between the inclined plate 5 and the horizontal direction is 55°, which facilitates the smooth sliding of sludge and achieves effective separation of mud and water.

[0046] The gas collecting hood 6 described above is preferably conical. The conical gas collecting hood 6 has a large-diameter inlet to facilitate the smooth entry of gas. The angle between the two inclined sides of the axial section of the cone and the horizontal direction is 55°.

[0047] Furthermore, the anaerobic reactor also includes a gas collection pipe 7, which is connected to the outlet of the gas collection hood 6 to discharge the gas collected by the gas collection hood 6 out of the device body 1. When the gas collection hood 6 is preferably conical, the gas collection pipe 7 is connected to the small diameter of the conical opening.

[0048] Preferably, a wet gas flow meter for detecting gas output is installed on the gas collection pipe 7.

[0049] In some embodiments, the anaerobic reactor further includes an inlet pipe 8 that connects the external reflux unit and the inlet of the device body 1. One end of the inlet pipe 8 extends into the water distribution area and is connected to the small-diameter inlet 201 of the inverted cone-shaped shell 2.

[0050] The outer reflux unit comprises a Venturi tube 9 and a reflux pipe 10. The Venturi tube 9 is arranged on the water inlet pipe 8 and comprises a liquid inlet section, a throat section and a diffusion section which are sequentially connected. The liquid inlet section and the diffusion section are tapered towards the throat section.

[0051] Due to the decrease of the cross-sectional area of the throat section, the flow rate of the water inlet increases and the pressure decreases, forming a negative pressure. One end of the reflux pipe 10 is connected to the water outlet of the device body 1 and the other end is connected to the throat section. Under the action of the negative pressure formed in the throat section, the water outlet at the water outlet of the device body 1 is sucked into the reflux pipe 10 and flows to the throat section of the Venturi tube 9. The sucked water outlet is mixed with the water inlet in the Venturi tube 9, and then the flow rate is slowed down in the diffusion section, the pressure is gradually restored, and a reflux cycle is completed.

[0052] The outer reflux system does not increase external power equipment for reflux and does not require additional energy consumption, thereby saving energy.

[0053] Moreover, the design of the outer reflux system not only returns the water outlet to the water inlet, effectively dilutes the concentration of toxic and harmful substances, thereby avoiding the impact of excessive load on the anaerobic system, but also utilizes the alkalinity generated in the methanogenesis stage in the acidification stage, thereby optimizing the entire anaerobic treatment process.

[0054] Further, the reflux pipe 10 is further provided with a valve and a flow meter, which facilitates more accurate adjustment of the reflux amount and control of the microbial environment of the reaction zone to prevent acidification.

[0055] In some embodiments, as shown in Figure 1 The water outlet area in the device body 1 is further provided with a baffle 11 and a water outlet weir 12. The baffle 11 is arranged outside the water outlet weir 12 and functions to guide the water flow subjected to anaerobic treatment. After passing through the baffle 11, the water flows smoothly into the water outlet weir 12 and is finally discharged through the water outlet pipe 13.

[0056] Preferably, the upper edge of the baffle 11 is lower than the upper edge of the water outlet weir 12, which further functions to separate solids from liquids. The solid particles are intercepted near the baffle 11, and the purified water flow can flow over the baffle 11 and flow into the water outlet weir 12.

[0057] In some embodiments, the device body 1 is a cylinder or a square, and the top of the device body 1 is provided with a movable cover plate which needs to be sealed.

[0058] The bottom of the device body 1 is further provided with a base, and the material of the base is preferably stainless steel or carbon steel.

[0059] The device body 1 can maintain the temperature by using plate heat exchange or steam heating.

[0060] The bottom of the device body 1 is further provided with a vent pipe 14 for quickly discharging the internal water and sludge during maintenance and cleaning.

[0061] Example 2

[0062] A chemical plant uses the anaerobic reaction device provided in Example 1 to treat PTA production wastewater, and when the temperature is 30-40℃, the TOC removal rate can reach more than 70%, and the biodegradability of the wastewater is improved, which is beneficial to subsequent biochemical treatment, and the effect is remarkable.

[0063] Example 3

[0064] High-concentration wastewater generated in the PE production stage of polyester chips in a certain factory has a COD≈

[0065] 5000mg / L-16000mg / L, and after being treated by the anaerobic reaction device provided in Example 1, the COD removal rate can reach more than 80%, and in the case of a large reflux ratio, the pH can be maintained neutral, and the VFA is reduced from 2000mg / L to 400mg / L.

[0066] Example 4

[0067] The main components of the wastewater of a certain chemical plant include methanol, formaldehyde, phenol and the like, and the anaerobic reaction device provided in Example 1 is used for treatment, and by adjusting the pH and temperature and the like, the COD removal rate is more than 75%, and the phenol removal rate is more than 90%.

[0068] The ideal embodiment of the utility model is an inspiration, and through the above description, relevant staff can certainly make various changes and modifications without deviating from the technical idea of the utility model.

[0069] The technical scope of the utility model is not limited to the content in the specification, and must be determined according to the scope of claims.

Claims

1. An anaerobic reaction device for industrial wastewater pretreatment, characterized by, The anaerobic reaction device comprises: a device body, which internally comprises, from bottom to top, a water distribution zone, a reaction zone and a water outlet zone; a water distribution assembly arranged in the water distribution zone, which comprises a shell and a plurality of water distribution holes, the shell being a conical structure with a gradually increasing caliber from the water inlet to the water outlet; a plurality of water distribution hole groups are arranged on the shell in a concentric circle shape from the water inlet to the water outlet, each water distribution hole group comprising a plurality of water distribution holes arranged along the circumferential direction of the central axis of the shell; a plurality of inner cylinders arranged vertically in the reaction zone; a three-phase separation assembly arranged in the water outlet zone for separating gas and solid from the water.

2. The anaerobic reaction device according to claim 1, wherein the angle between the water distribution hole and the central axis of the shell is 45°.

3. The anaerobic reaction device according to claim 1 or 2, wherein the inner cylinder is frustoconical, the ratio of the small caliber to the large caliber of the inner cylinder is 5:7-6:7, and the angle between the generatrix of the inner cylinder and the horizontal direction is 75°-85°.

4. The anaerobic reaction device according to claim 3, wherein the ratio of the diameter of the inner cylinder to the diameter of the reaction zone is 0.5-0.

7.

5. The anaerobic reaction device according to claim 1, wherein the three-phase separation assembly comprises a separation plate group and a gas collection cover, the separation plate group comprises a plurality of inclined plates arranged in parallel and at equal distances, and a plurality of fluid passages are formed between the inclined plates; the gas collection cover is located at the top of the separation plate group to collect the gas separated by the separation plate group.

6. The anaerobic reaction device according to claim 5, wherein the angle between the inclined plate and the horizontal direction is 55°; the gas collection cover is conical, and the angle between the inclined edge of the conical shape and the horizontal direction is 55°.

7. The anaerobic reaction device according to claim 5 or 6, further comprising: a gas collection pipeline in communication with the gas outlet of the gas collection cover.

8. The anaerobic reaction device according to claim 1, further comprising: an external reflux unit and a water inlet pipeline in communication with the water inlet of the device body, the external reflux unit comprises a Venturi tube and a reflux pipeline, the Venturi tube is arranged on the water inlet pipeline and comprises an inlet section, a throat section and a diffusion section in sequence, and the inlet section and the diffusion section are tapered towards the throat section; one end of the reflux pipeline is in communication with the water outlet of the device body, and the other end is in communication with the throat section.

9. The anaerobic reaction device according to claim 1, wherein the water outlet zone is provided with a baffle and a water outlet weir, the baffle is arranged outside the water outlet weir, and the upper edge height of the baffle is lower than that of the water outlet weir.

10. The anaerobic reaction device according to claim 1, wherein the device body is cylindrical or cubic; and / or a movable cover plate is mounted on the top of the device body; and / or further comprising a base arranged at the bottom of the device body, and the base is made of stainless steel or carbon steel. ​

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