A wastewater neutralization and treatment device

Abstract

This utility model belongs to the field of wastewater treatment technology, and particularly relates to a wastewater neutralization treatment device, comprising: a neutralization treatment tank, with an inlet pipe and an outlet pipe at both ends; a carbonate supply unit, including a supply pipe for conveying neutralized carbonate to the neutralization treatment tank; further comprising: a pretreatment tank, located upstream of the neutralization treatment tank, used to collect wastewater to be treated; and an aeration unit, located above the pretreatment tank, including a blower and an aeration pipe; wherein the air inlet end of the aeration pipe is connected to the output end of the blower, the air outlet end of the aeration pipe extends into the pretreatment tank and is equipped with an aeration nozzle, and the inlet pipe of the pretreatment tank is connected to the neutralization treatment tank to input wastewater into the neutralization treatment tank. Compared with the prior art, this utility model improves the wastewater treatment effect.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, and in particular relates to a wastewater neutralization treatment device. Background Technology

[0002] Common acidic and alkaline substances in wastewater are generated during industrial production processes, such as chemical, metallurgical, and power industries. Acidic wastewater contains strong acids such as sulfuric acid, hydrochloric acid, and hydrofluoric acid, while alkaline wastewater may contain alkaline substances such as sodium hydroxide and calcium hydroxide. Wastewater neutralization treatment devices are typically used to remove acidic and alkaline substances from wastewater, restoring the water's pH value to near neutral (pH 7) to ensure that the wastewater meets discharge standards or reuse requirements. Existing wastewater neutralization treatment devices typically use acid for neutralization reactions. However, traditional carbonic acid neutralization devices suffer from short contact times and incomplete neutralization of wastewater, which greatly reduces the treatment efficiency. Therefore, improvements are necessary. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a wastewater neutralization treatment device to effectively improve the neutralization treatment effect of wastewater.

[0004] In view of this, the present invention provides a wastewater neutralization treatment device, comprising: A neutralization treatment tank, wherein an inlet pipe and an outlet pipe are provided at both ends of the neutralization treatment tank; A carbonate supply unit, the carbonate supply unit including a supply pipe for conveying neutralized carbonate to a neutralization treatment tank; Also includes: A pretreatment tank is located upstream of the neutralization treatment tank and is used to collect wastewater to be treated. An aeration unit is disposed above the pretreatment tank, and the aeration unit includes a blower and an aeration pipe; The air inlet of the aeration pipe is connected to the output of the blower, the air outlet of the aeration pipe extends into the pretreatment tank and is equipped with an aeration nozzle, and the inlet pipe of the pretreatment tank is connected to the neutralization tank to input wastewater into the neutralization tank.

[0005] In this technical solution, during neutralization treatment, the wastewater flows sequentially through a pretreatment tank and a neutralization tank. The aeration unit in the pretreatment tank injects air into the wastewater through aeration pipes and blowers. On the one hand, this oxidizes reducing substances (such as sulfides and nitrites) in the wastewater, preventing them from affecting the carbonation neutralization reaction. On the other hand, it agitates the wastewater, making its composition (such as pH value and suspended solids concentration) uniform, eliminating the impact of water quality fluctuations on the neutralization reaction. Simultaneously, the bubbles generated by aeration can carry some suspended solids to the surface, playing a preliminary separation role and reducing the sedimentation load in the subsequent neutralization tank. This effectively improves the neutralization reaction effect of the wastewater in the subsequent neutralization tank, thereby improving the wastewater treatment effect and avoiding incomplete neutralization of wastewater due to short contact time.

[0006] In the above technical solution, the neutralization treatment pool further includes: The segmented pool body includes two end pool bodies and a middle pool body located between the two end pool bodies. The two end pool bodies and the middle pool body are fixed to each other by connecting flanges. An upstream baffle plate is installed in the end tank located on the upstream side, and there is space above the upstream baffle plate for wastewater to pass through; The intermediate baffles are of several kinds, and the intermediate baffles are evenly distributed at intervals along the axial direction of the intermediate pool body and are staggered vertically to form a Z-shaped flow channel in the intermediate pool body. A downstream baffle plate is disposed in the end tank located on the downstream side, and there is space above the downstream baffle plate for wastewater to pass through; The output end of the supply pipe extends into the bottom of the end pool located on the upstream side, and the output end of the air supply pipe is located on the upstream side of the upstream baffle.

[0007] Furthermore, the above technical solution also includes: A post-treatment tank is located upstream of the neutralization treatment tank, and the post-treatment tank is equipped with a treated water outlet and a pH sensor. A treated water storage tank is located downstream of the downstream treatment tank; The outlet pipes of the post-treatment tank and the neutralization tank are connected to allow the neutralized wastewater to stand and separate. The post-treatment tank discharges the upper layer of clear water generated after standing through the treated water outlet. The treated water storage tank is connected to the treated water outlet to store the discharged upper layer of clear water.

[0008] Furthermore, the above technical solution also includes: A nozzle protective cover is installed on the aeration nozzle and completely covers the aeration nozzle; The nozzle protective cover opens when the aeration nozzle is working and injects air into the wastewater, and closes when the aeration nozzle stops to prevent sludge in the wastewater from adhering to the aeration nozzle.

[0009] In the above technical solution, the nozzle protective cover further includes: An elastic cover is provided on the outside of the aeration nozzle; A slit, wherein the slits are of several and evenly distributed on the elastic cover; The elastic cover expands and deforms under air pressure when the aeration nozzle outputs air, and the slit is opened under the compression of air pressure to allow air to pass through.

[0010] The beneficial effects of this utility model are: 1. More thorough neutralization and stable treatment effect: Through the segmented tank body and Z-shaped flow channel design of the neutralization treatment tank, the wastewater is forced to flow in a tortuous manner, which prolongs the residence time of the wastewater in the tank. At the same time, carbonic acid gas is injected from the bottom of the tank at the upstream end, forming a "countercurrent contact" with the wastewater, which greatly increases the contact area and contact time between carbonic acid and wastewater, solves the problem of incomplete neutralization in existing devices, and improves the wastewater treatment effect.

[0011] 2. Excellent pretreatment effect and high reaction stability: The aeration unit of the pretreatment tank injects air into the wastewater through multiple aeration pipes and microporous aeration heads. On the one hand, it can oxidize the reducing substances in the wastewater, preventing them from affecting the carbonic acid neutralization reaction; on the other hand, it can agitate the wastewater, making the wastewater composition uniform and eliminating the impact of water quality fluctuations on the neutralization reaction. At the same time, the bubbles generated by aeration can carry some suspended solids to the surface, playing a preliminary separation role and reducing the sedimentation load of the subsequent neutralization treatment tank. This effectively improves the neutralization reaction effect of the wastewater in the subsequent neutralization treatment tank, thereby improving the wastewater treatment effect and avoiding incomplete neutralization of wastewater due to short contact time.

[0012] 3. Anti-clogging aeration nozzles and low maintenance costs: The elastic cover of the nozzle protective cover expands during aeration, opening the slits to allow air to pass through. When the machine stops, the elasticity returns and the slits close, effectively preventing sludge and suspended solids from adhering to the aeration nozzles. The nozzle clogging rate is effectively reduced, significantly reducing the frequency of disassembly and cleaning, and reducing maintenance workload. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0015] Figure 2 This is a schematic diagram of the pretreatment tank structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the neutralization treatment tank structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the nozzle protective cover structure of this utility model.

[0018] Figure 5 This is a schematic cross-sectional view of the nozzle protective cover of this utility model.

[0019] The markings in the diagram are as follows: 1. Neutralization treatment tank; 100. Inlet pipe; 101. Outlet pipe; 102. End tank body; 103. Middle tank body; 104. Upstream baffle; 105. Intermediate baffle; 106. Downstream baffle; 2. Supply pipe; 3. Pretreatment tank; 4. Aeration pipe; 5. Posttreatment tank; 50. Treated water outlet; 6. Treated water storage tank; 7. Sprinkler protective cover; 70. Flexible cover; 71. Slit. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] This wastewater neutralization treatment device includes, in sequence, a pretreatment tank, a neutralization tank, a posttreatment tank, a treated water storage tank, and a sludge storage tank along the wastewater treatment process. It is also equipped with an aeration unit, a carbonic acid supply unit, and auxiliary control components (such as pH sensors and return pipes) to form a complete treatment process of "pretreatment-neutralization reaction-solid-liquid separation-resource recovery", ensuring efficient and stable neutralization of wastewater and realizing resource recycling.

[0023] Pre-treatment pool 3 The pretreatment tank 3 is located upstream of the neutralization tank 1 and is used to collect the industrial wastewater to be treated (especially alkaline wastewater), providing a stable water quality foundation for subsequent aeration pretreatment and neutralization reactions. The pretreatment tank 3 is preferably cylindrical or cuboid in shape (the shape can be flexibly selected according to site space). The tank body is made of corrosion-resistant stainless steel (such as 304 stainless steel) or fiberglass to avoid wastewater corrosion. The tank volume is designed according to the treatment capacity, for example, for a 10m³ treatment tank. 3 For a wastewater treatment capacity of / h, the preferred volume of the pretreatment tank 3 is 20m³. 3 Ensure that the wastewater stays in the pool for no less than 2 hours to provide sufficient time for aeration pretreatment.

[0024] The top of the pretreatment tank 3 is equipped with a wastewater inlet pipe for receiving wastewater to be treated from external sources; the bottom of the tank is equipped with an emptying pipe (with a valve) to facilitate the emptying of residual wastewater in the tank during equipment maintenance; a connecting pipe is installed on the side wall of the tank near the bottom, which is sealed to the inlet pipe 100 of the neutralization tank 1 for transporting the wastewater after aeration pretreatment to the neutralization tank 1.

[0025] Aeration unit The aeration unit is located above the pretreatment tank 3 and is used to inject air into the wastewater in the pretreatment tank 3 to achieve aeration pretreatment. The aeration unit includes a blower, aeration pipe 4, and aeration nozzles. The blower selected is either a Roots blower or a centrifugal blower. Its air volume and pressure are determined based on the volume of the pretreatment tank and the wastewater treatment capacity. For example, for a 20m³ wastewater treatment tank... 3 The pretreatment tank 3 has a blower air volume preferably of 5-8 m³ / h. 3 / min, the outlet pressure is preferably 0.05-0.1MPa to ensure that air can effectively penetrate the wastewater and form uniform bubbles; The aeration pipe 4 is a corrosion-resistant polyethylene (PE) pipe or stainless steel pipe. Its air inlet end is sealed and connected to the output end of the blower through a flange. The main body of the aeration pipe 4 is arranged horizontally above the tank body along the length of the pretreatment tank 3 and extends into the tank body. The number of aeration pipes 4 is determined according to the size of the tank body, preferably 2-4, to ensure that the air is evenly distributed in the tank. The aeration nozzles are installed at the air outlet end of the aeration pipe 4 and extend below the surface of the wastewater in the pretreatment tank 3 (preferably 0.5-1m from the bottom of the tank); the number of aeration nozzles on each aeration pipe 4 is preferably 3-5, and they are evenly distributed along the length of the aeration pipe 4.

[0026] Nozzle Protective Cover 7 The nozzle guard 7 is installed on the outside of the aeration nozzle and is fixedly connected to the aeration pipe 4 (e.g., by threaded connection). The nozzle guard 7 includes a resilient cover 70 and a slit 71. The elastic cover 70 is made of aging-resistant and corrosion-resistant silicone rubber material. Its shape is adapted to the aeration nozzle (such as hemispherical or cylindrical) and completely covers the outside of the aeration nozzle. The thickness of the elastic cover 70 is preferably 2-3mm to ensure sufficient elastic deformation capacity and avoid being crushed by wastewater pressure. The slits 71 are evenly distributed along the circumference of the elastic cover 70, preferably 8-12 in number, with an initial width of 0.1-0.2 mm for each slit 71. When the aeration nozzle is working, the air output from the blower enters the interior of the elastic cover 70, and the air pressure pushes the elastic cover 70 to expand and deform. The slits 71 are opened under pressure (the width after opening is 0.5-1 mm), and the air enters the wastewater through the slits 71 and forms bubbles. When the aeration nozzle stops working, the elastic cover 70 returns to its original shape under its own elasticity, and the slits 71 close, thereby preventing sludge and suspended solids in the wastewater from adhering to the aeration nozzle and avoiding blockage.

[0027] Neutralization treatment pool 1 Neutralization tank 1 is the core reaction unit of the device, used to achieve thorough mixing and neutralization of carbon dioxide gas and wastewater. Neutralization tank 1 includes a segmented tank body, an upstream baffle 104, an intermediate baffle 105, a downstream baffle 106, and a supply pipe 2 for the carbon dioxide supply unit. Segmented tank body: The tank body is cylindrical (or rectangular according to requirements), consisting of two end tanks 102 and a middle tank 103. The inner diameter of all three is the same (preferably 1.5-2m) to ensure smooth wastewater flow. The length of the end tanks 102 is preferably 2-3m, and the length of the middle tank 103 is preferably 4-6m (adjustable according to the treatment capacity). The two end tanks 102 are located upstream and downstream of the middle tank 103, respectively, and are sealed and fixed to both ends of the middle tank 103 by connecting flanges (acid-resistant rubber gaskets are installed between the flanges to ensure a leak-proof seal). The segmented structure design facilitates disassembly and cleaning. When sediment accumulates inside the middle tank 103, the middle tank 103 can be disassembled separately for maintenance without shutting down the entire system.

[0028] Inlet pipe 100 and outlet pipe 101: Inlet pipe 100 is located at the center of the side wall of the end tank 102 on the upstream side and is sealed to the connecting pipe of the pretreatment tank 3 for receiving pretreated wastewater; outlet pipe 101 is located at the center of the side wall of the end tank 102 on the downstream side and is sealed to the inlet pipe of the posttreatment tank 5 for transporting neutralized wastewater to the posttreatment tank 5.

[0029] Baffles: The upstream baffle 104, the intermediate baffle 105, and the downstream baffle 106 all adopt a two-thirds circular plate structure (made of corrosion-resistant stainless steel). That is, one side of the circular plate has a cut-off portion with a cross-section parallel to the radial direction. The arc side of the circular plate is fixedly and sealed to the inner wall of the segmented pool body by welding. The flat side (end face of the cut-off portion) forms a space for wastewater to pass through between itself and the inner wall of the other side of the pool body (the height of this space is preferably 1 / 3 of the pool body diameter, i.e., 0.5-0.67m). The upstream baffle 104 is installed in the end tank 102 located on the upstream side and is located downstream of the inlet pipe 100. It is used to guide the wastewater to flow downward and prevent the wastewater from flowing directly and quickly from the top. The number of intermediate baffles 105 is preferably 3-5, and they are evenly distributed along the axial direction of the central pool 103 (the spacing between adjacent baffles is preferably 1-1.5m). Several intermediate baffles 105 are staggered vertically (that is, in adjacent intermediate baffles 105, the cut-off part of the previous one faces upward and the cut-off part of the next one faces downward), thereby forming a "Z-shaped flow channel" in the central pool 103, forcing the wastewater to flow in a tortuous manner along the flow channel and prolonging the residence time of the wastewater in the pool. The downstream baffle 106 is installed in the end tank 102 located on the downstream side and is positioned upstream of the outlet pipe 101. Its cut-off portion faces upward and cooperates with the upstream baffle 104 to ensure that the wastewater flows fully throughout the segmented tank.

[0030] Carbonic acid supply unit: includes a liquefied carbonic acid storage tank, a vaporizer, a pressure reducing valve, a flow regulating valve, and supply pipe 2. The liquefied carbon dioxide storage tank is a high-pressure carbon steel tank (preferably with a volume of 500-1000L) used to store liquid carbon dioxide; The vaporizer is an electrically heated vaporizer. Its inlet is connected to the outlet of the liquefied carbonic acid storage tank through a high-pressure pipe, and its outlet is connected to the inlet of a pressure reducing valve. It is used to vaporize liquid carbonic acid into gaseous carbonic acid (the vaporization temperature is controlled at 25-30℃ to ensure that the liquid carbonic acid is completely vaporized). The pressure reducing valve is used to reduce the pressure of the vaporized carbonic acid gas to 0.3-0.5 MPa to prevent high-pressure gas from impacting the tank. The flow regulating valve is connected to the outlet of the pressure reducing valve to adjust the supply of carbon dioxide gas according to the pH value and treatment volume of the wastewater (adjustment range is 5-15m). 3 / h); The supply pipe 2 is a corrosion-resistant stainless steel pipe. Its inlet end is connected to the outlet of the flow regulating valve, and its outlet end (i.e. the output end of the supply pipe 2) extends to the bottom of the end tank 102 located on the upstream side and is located on the upstream side of the upstream baffle 104. A gas distributor (such as a porous distributor) is provided at the outlet end of the supply pipe 2 to ensure that the carbon dioxide gas is evenly dispersed into the wastewater in the form of fine bubbles and fully mixed with the wastewater.

[0031] Post-treatment tank 5 The post-treatment tank 5 is located downstream of the neutralization tank 1 and is sealed and connected to the outlet pipe 101 of the neutralization tank 1. It is used for static solid-liquid separation of the neutralized wastewater, separating the carbonate precipitates (such as calcium carbonate and sodium carbonate precipitates) generated during the neutralization reaction. The post-treatment tank 5 has a rectangular or cylindrical structure (made of stainless steel or fiberglass), and its volume is determined according to the treatment capacity of the neutralization tank 1, for example, for a 10m³ treatment tank. 3 The processing capacity is / h, and the volume of the post-treatment tank 5 is preferably 30m³. 3 Ensure that the wastewater retention time is not less than 3 hours to allow the sediment to settle fully.

[0032] The post-treatment tank 5 is equipped with an inlet pipe (connected to the outlet pipe 101 of the neutralization tank 1), and a treated water outlet 50 is located near the top of the side wall (for discharging the upper layer of clear water generated after settling). The treated water outlet 50 can be connected to the pre-treatment tank 3 via a three-way valve for recirculating unqualified treated water. A sludge outlet (with a butterfly valve) is located at the bottom for discharging settled sludge. In addition, a pH sensor is installed in the post-treatment tank 5. The pH sensor can be installed in two locations: one is directly on the side wall of the post-treatment tank 5 near the treated water outlet 50, and the other is on the pipe between the treated water outlet 50 and the treated water storage tank 6. The pH sensor is an online pH sensor (measurement range 0-14, accuracy ±0.01pH) used to detect the pH value of the upper layer of clear water in real time to ensure that the effluent meets the discharge standards (such as pH 6-9).

[0033] Water treatment storage tank 6 The treated water storage tank 6 is located downstream of the post-treatment tank 5 and is connected to the treated water outlet 50 of the post-treatment tank 5 via a sealed pipe. It is used to store the upper layer of clean water that has passed testing and meets standards. The volume of the treated water storage tank 6 is preferably 1.5 times the volume of the post-treatment tank 5 (e.g., 45m³). 3The tank acts as a buffer to prevent flow fluctuations caused by direct discharge of treated water. The tank body is made of the same material as the post-treatment tank 5, and a discharge pipe (with a valve) is installed at the bottom. The qualified clean water can be directly discharged to the municipal pipe network through the discharge pipe, or transported to the production workshop for reuse.

[0034] sludge storage tank The sludge storage tank is connected to the sludge discharge outlet of the post-treatment tank 5 via a pipeline, and is used to store the settled sludge discharged from the post-treatment tank 5. The volume of the sludge storage tank is preferably 10-20 m³. 3 A return pipe is installed on the side wall of the tank near the top. The other end of the return pipe is connected to the wastewater inlet pipe of the pretreatment tank 3 or the inside of the tank. A water pump and valve are installed on the return pipe to return the upper layer water (containing incompletely neutralized wastewater) generated by the static stratification in the sludge storage tank to the pretreatment tank 3 for secondary treatment, thereby improving the wastewater treatment rate and water resource utilization rate. A sludge discharge pipe (with screw pump) is installed at the bottom of the sludge storage tank. When the sludge accumulates to a certain height in the tank (such as 2 / 3 of the tank height), the sludge is transported to the filter press for dewatering through the screw pump. The dewatered sludge cake can be used as a raw material for building materials or disposed of in a harmless manner.

[0035] Work process Alkaline wastewater (pH 12.5) from the metallurgical plant is collected and pretreated by aeration. It is then transported via pipeline to the wastewater inlet pipe of pretreatment tank 3 and enters the tank. The blower of the aeration unit is activated, and air is delivered to the aeration nozzles via aeration pipe 4. At this time, the elastic cover 70 outside the aeration nozzle expands under air pressure, opening the slit 71 (width 0.8 mm). Air passes through the slit 71, forming tiny bubbles (10-20 μm in diameter), which are evenly dispersed into the wastewater. The aeration process lasts for 1.5 hours. During this time, the air oxidizes reducing substances in the wastewater (such as sulfides, reducing them from 50 mg / L to below 5 mg / L), while simultaneously agitating the wastewater to ensure uniform water quality. Some suspended solids (particle size greater than 100 μm) float to the surface under the influence of the bubbles and are removed via subsequent overflow. The pH of the pretreated wastewater stabilizes at 12.3-12.5 and is then transported to the inlet pipe 100 of neutralization tank 1 via a connecting pipe.

[0036] The wastewater pretreated by the carbonic acid neutralization reaction enters the upstream end tank 102 of the neutralization treatment tank 1 through the inlet pipe 100. Simultaneously, the carbonic acid supply unit is activated: liquid carbonic acid in the liquefied carbonic acid storage tank enters the vaporizer and is completely vaporized into gaseous carbonic acid at 28°C; the gaseous carbonic acid is then depressurized to 0.4 MPa by a pressure reducing valve, and its flow rate is adjusted to 10 m³ / s by a flow regulating valve. 3The gas is supplied at a rate of / h (dynamically adjusted according to the pH value of the wastewater) to the bottom of the upstream end tank 102 via supply pipe 2. It is dispersed into fine bubbles (2-5mm in diameter) by the gas distributor and comes into countercurrent contact with the wastewater. The wastewater flows downward under the guidance of the upstream baffle 104 and enters the middle tank 103. It then flows in a tortuous manner along the Z-shaped flow channel formed by the middle baffle 105 (the flow velocity decreases from 0.5m / s to 0.15m / s). During this period, the carbonic acid reacts fully with the calcium hydroxide in the wastewater: Ca(OH)2 + CO2 = CaCO3↓ + H2O, forming calcium carbonate precipitate. The wastewater continues to flow to the downstream end tank 102. After being guided by the downstream baffle 106, it is transported to the post-treatment tank 5 through the outlet pipe 101. At this time, the pH of the wastewater has dropped to 7.5-8.0.

[0037] After solid-liquid separation and neutralization, the wastewater (containing calcium carbonate precipitate) enters the post-treatment tank 5 through the inlet pipe and is left to stand for 3 hours. During this period, the calcium carbonate precipitate (particle size 50-100μm) settles to the bottom of the tank under gravity, forming a sludge layer (thickness about 0.5m), and a clear water layer (pH 7.5-8.0, suspended solids content 8mg / L) is formed on top. The pH sensor detects the pH value of the upper clear water. After confirming that it meets the standard, the valve of the treated water outlet 50 is opened, and the upper clear water is transported to the treated water storage tank 6 through the pipeline for subsequent discharge or reuse. If the pH value does not meet the standard (such as higher than 9 or lower than 6), the valve of the treated water outlet 50 is closed, and the clear water is transported back to the pre-treatment tank 3 for secondary treatment.

[0038] The sludge layer in the post-treatment tank 5 for sludge treatment and resource recovery is discharged to the sludge storage tank through the sludge discharge outlet (by opening the butterfly valve). The sludge is left to stand in the sludge storage tank for 2 hours, and then further stratifies into an upper layer of water (pH 8.2-8.5) and a lower layer of concentrated sludge. The centrifugal pump on the return pipe is started to return the upper layer of water to the pre-treatment tank 3 for secondary neutralization treatment. When the concentrated sludge in the sludge storage tank accumulates to a height of 1m, the screw pump on the sludge discharge pipe is started to transport the concentrated sludge to the filter press for dewatering (the moisture content of the sludge cake after dewatering is below 60%). The sludge cake is recycled as raw material for building bricks, realizing resource utilization.

[0039] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A wastewater neutralization treatment device, comprising: Neutralization treatment tank (1), wherein an inlet pipe (100) and an outlet pipe (101) are provided at both ends of the neutralization treatment tank (1); A carbonate supply unit, the carbonate supply unit comprising a supply pipe (2) for conveying neutralized carbonate to a neutralization treatment tank (1); Its characteristic is that it further includes: A pretreatment tank (3) is located upstream of the neutralization treatment tank (1) and is used to collect wastewater to be treated. An aeration unit is provided above the pretreatment tank (3), and the aeration unit includes a blower and an aeration pipe (4). The air inlet of the aeration pipe (4) is connected to the output of the blower, the air outlet of the aeration pipe (4) extends into the pretreatment tank (3) and is equipped with an aeration nozzle, and the pretreatment tank (3) is connected to the inlet pipe (100) of the neutralization tank (1) to input wastewater into the neutralization tank (1).

2. The wastewater neutralization treatment device according to claim 1, characterized in that, The neutralization treatment tank (1) also includes: The segmented pool body includes two end pool bodies (102) and a middle pool body (103) located between the two end pool bodies (102). The two end pool bodies (102) and the middle pool body are fixed to each other by connecting flanges. An upstream baffle (104) is provided in an end pool (102) located on the upstream side, and there is space above the upstream baffle (104) for wastewater to pass through; The intermediate baffle (105) has a plurality of intermediate baffles (105), which are evenly spaced along the axial direction of the intermediate pool (103) and are staggered vertically to form a Z-shaped flow channel in the intermediate pool (103). A downstream baffle (106) is provided in the end tank (102) located on the downstream side, and there is space above the downstream baffle (106) for wastewater to pass through; The output end of the supply pipe (2) extends into the bottom of the end pool (102) located on the upstream side, and the output end of the air supply pipe is located on the upstream side of the upstream baffle (104).

3. The wastewater neutralization treatment device according to claim 2, characterized in that, Also includes: A post-treatment tank (5) is located upstream of the neutralization treatment tank (1), and the post-treatment tank (5) is equipped with a treated water outlet (50) and a pH sensor. A treated water storage tank (6) is located downstream of the downstream treatment tank; The post-treatment tank (5) is connected to the outlet pipe (101) of the neutralization treatment tank (1) for static separation treatment of the neutralized wastewater. The post-treatment tank (5) discharges the upper layer of clear water generated after static separation through the treated water outlet (50). The treated water storage tank (6) is connected to the treated water outlet (50) for storing the discharged upper layer of clear water.

4. The wastewater neutralization treatment device according to claim 1, characterized in that, Also includes: Nozzle guard (7), the nozzle guard (7) is set on the aeration nozzle and completely covers the aeration nozzle; The nozzle guard (7) opens when the aeration nozzle is working and injects air into the wastewater, and closes when the aeration nozzle stops and prevents sludge in the wastewater from adhering to the aeration nozzle.

5. The wastewater neutralization treatment device according to claim 4, characterized in that, The nozzle guard (7) also includes: An elastic cover (70) is provided on the outside of the aeration nozzle; Slits (71), said slits (71) having a plurality of them and evenly distributed on the elastic cover (70); The elastic cover (70) expands and deforms under air pressure when the aeration nozzle outputs air, and the slit (71) is opened under the compression of air pressure to allow air to pass through.

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