A wastewater treatment system and method for mixing station

Abstract

The present application relates to the technical field of sewage treatment, and discloses a sewage treatment system and method for a mixing station, the system including a neutralization device, the neutralization device including: a box body, a neutralization reaction chamber is arranged in the box body, a liquid inlet and a liquid outlet connected to the neutralization reaction chamber are arranged on the box body; an aeration pipeline including an aeration main pipe and an aeration branch pipe, the input end of the aeration main pipe is connected to the air source, the aeration branch pipe includes an aeration section and a sinking section, the aeration section is located in the neutralization reaction chamber, aeration holes are arranged on the aeration section, the aeration section is connected to the output end of the aeration main pipe through the sinking section, the sinking section is a U-shaped structure, and a three-way valve is arranged at the bottom; a recovery device including a buffer chamber, the third port of the three-way valve is connected to the buffer chamber. In the embodiment of the present application, by setting the sinking section, the filtrate in the neutralization reaction chamber and the residual carbon dioxide gas in the pipe can be discharged to the buffer chamber to avoid sediment accumulation and blockage of the aeration holes.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a sewage treatment system and method for a mixing station. Background Art

[0002] In the sewage treatment process of the mixing plant, after the solid and liquid of the sewage are separated, carbon dioxide needs to be introduced into the separated filtrate for neutralization reaction to reduce the pH value of the filtrate. In this process, carbon dioxide will also react with calcium ions in the filtrate to cause it to precipitate.

[0003] In the related art, the aeration pipeline for introducing carbon dioxide is directly placed in the neutralization reaction device, and the gas source is located outside the neutralization reaction device. When the aeration pipeline stops introducing carbon dioxide into the neutralization reaction device, the filtrate in the neutralization reaction device will form a gas-liquid equilibrium interface with the carbon dioxide remaining in the aeration pipe on the inner wall of the aeration hole, and react to generate precipitation. Due to the small size of the aeration holes in the aeration pipeline, precipitation accumulates on the inner wall of the aeration hole, causing the hole to be blocked, affecting the normal use of the aeration pipeline, and further increasing the maintenance cost of the aeration pipeline, affecting the service life of the mixing station sewage treatment device. Summary of the invention

[0004] The present application provides a mixing station sewage treatment system and method, which are at least used to solve the problem of carbon dioxide reacting with calcium ions in sewage to generate precipitation and block aeration pipelines during sewage treatment.

[0005] In a first aspect, an embodiment of the present application provides a mixing station sewage treatment system, including a neutralization device, the neutralization device including: a box body, a neutralization reaction chamber is arranged in the box body, and a liquid inlet and a liquid outlet connected to the neutralization reaction chamber are arranged on the box body; an aeration pipeline, the aeration pipeline is used to introduce carbon dioxide gas into the neutralization reaction chamber, the aeration pipeline includes an aeration main pipe and an aeration branch pipe, the input end of the aeration main pipe is connected to an air source, the aeration branch pipe includes an aeration section and a sinking section, the aeration section is located in the neutralization reaction chamber, aeration holes are arranged on the aeration section, the aeration section is connected to the aeration main pipe through the sinking section, the sinking section is a U-shaped structure, and a three-way valve is arranged at the bottom; a recovery device includes a buffer chamber, and the third port of the three-way valve is connected to the buffer chamber.

[0006] In the second aspect, an embodiment of the present application provides a method for treating wastewater in a mixing station, which is performed based on a wastewater treatment system of the mixing station. The method includes aeration reflux, and the aeration reflux: during the neutralization treatment process, the three-way valve is controlled to connect the box body and the buffer chamber, and the carbon dioxide gas in the aeration branch pipe between the box body and the buffer chamber is discharged through the filtrate in the neutralization reaction chamber.

[0007] Beneficial effects of this application:

[0008] By setting a branch pipe in the aeration pipe, and setting a sinking section in the aeration branch pipe, connected to the aeration main pipe, in response to the three-way valve connecting the aeration main pipe and the box body, the gas source can introduce carbon dioxide into the neutralization reaction chamber, and in response to the three-way valve connecting the box body and the cache chamber, the filtrate in the neutralization reaction chamber, driven by the gravitational potential energy, spontaneously flows into the sinking section through the aeration hole. At this time, in the process of the filtrate flowing downward, the sediment accumulated at the aeration hole can be flushed into the aeration section, and the sediment and the filtrate are discharged into the cache chamber together. At this time, the gas-liquid equilibrium interface originally located on the inner side of the aeration hole is broken, and the carbon dioxide gas in the aeration branch pipe connected between the box body and the cache chamber is also discharged to the cache chamber, which avoids the carbon dioxide reacting with the filtrate in the aeration hole or aeration pipe to generate precipitation, block the aeration hole and the aeration pipe, and affect the service life of the neutralization device. At the same time, since the filtrate has a flushing effect on the formed sediment during its downward flow, the embodiment of the present application can further clean the mixing station sewage treatment system, avoid the problem of frequent maintenance due to blockage failure, and reduce the maintenance cost of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0010] In the attached picture:

[0011] Figure 1 An axonometric diagram of a wastewater treatment system of a mixing plant disclosed in some embodiments of the present application;

[0012] Figure 2 A schematic diagram of the structure of a neutralization device disclosed in some embodiments of the present application;

[0013] Figure 3 It is a schematic diagram of the structure of the aeration hole disclosed in some embodiments of the present application;

[0014] Figure 4 It is a schematic diagram of the structure of the separation device disclosed in some embodiments of the present application;

[0015] Figure 5 A schematic diagram of the structure of a mixing station sewage treatment system disclosed in some embodiments of the present application;

[0016] Figure 6 It is a schematic diagram of the cross-sectional structure of the gas-liquid equilibrium interface in the aeration hole disclosed in some embodiments of the present application;

[0017] Figure 7 This is a schematic diagram of the cross-sectional structure of sediment accumulation at the aeration holes disclosed in some embodiments of the present application.

[0018] Description of reference numerals:

[0019] 100-neutralization device, 110-tank, 120-aeration pipeline, 140-buffer chamber,

[0020] 131-recovery pipeline, 132-neutralization circulation pipeline,

[0021] 111-neutralization reaction chamber, 112-liquid inlet, 113-liquid outlet, 114-slag outlet,

[0022] 121-aeration main pipe, 122-aeration branch pipe, 1221-aeration section, 1222-sinking section, 1223-three-way valve, 1224-aeration hole,

[0023] 200-separation device, 210-sand and gravel separation equipment, 220-mixing tank, 230-plate and frame filter equipment, 240-filtrate tank,

[0024] 300-detection device, 310-water reservoir. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0026] In order to facilitate understanding of the embodiments of the present application, the relevant technologies are first introduced in conjunction with application scenarios.

[0027] In the wastewater treatment process of the mixing plant, carbon dioxide needs to be introduced into the filtrate after solid-liquid separation to neutralize its alkalinity. During the neutralization reaction, carbon dioxide will react with calcium ions in the filtrate to produce calcium carbonate precipitation.

[0028] In the related art, the aeration pipeline 120 for introducing carbon dioxide into the neutralization reaction chamber 111 is often directly exposed to the filtrate, and at the same time, the gas source for supplying carbon dioxide is arranged outside the neutralization reaction chamber 111. Since the wastewater treatment system of the mixing station is often used non-continuously, the neutralization device 100 in the wastewater treatment system of the mixing station works intermittently. When the neutralization device 100 is in a shutdown state, the aeration pipeline 120 stops introducing carbon dioxide into the neutralization reaction chamber 111, but carbon dioxide gas will remain in the aeration pipeline 120, and under the pressure of the filtrate in the neutralization reaction chamber 111, a gas-liquid pressure balance interface will be formed on the inner wall of the aeration hole 1224 of the aeration pipeline 120, causing carbon dioxide to react with calcium ions in the filtrate to form precipitation accumulation on the inner wall of the aeration hole 1224. Since the aeration hole 1224 itself has a limited size, it is very easy to cause blockage on the inner wall of the aeration hole 1224 due to precipitation accumulation, which increases the maintenance frequency of the wastewater treatment system of the mixing station.

[0029] In view of this, the present application proposes a mixing station sewage treatment system and method, as follows Figure 1-Figure 7 The technical solutions disclosed in each embodiment of the present application are described in detail.

[0030] like Figure 1 , Figure 2 As shown, the wastewater treatment system of the mixing station includes a neutralization device 100.

[0031] In the embodiment of the present application, the neutralization device 100 includes a housing 110 , a neutralization reaction chamber 111 is disposed in the housing 110 , and a liquid inlet 112 and a liquid outlet 113 communicating with the neutralization reaction chamber 111 are disposed on the housing 110 .

[0032] The neutralization reaction chamber 111 is a space where the filtrate and the carbon dioxide gas undergo a neutralization reaction.

[0033] In the embodiments of the present specification, the filtrate enters the neutralization reaction chamber 111 through the liquid inlet 112 on the housing 110 , and is treated by carbon dioxide neutralization. The neutralized filtrate is then discharged from the neutralization reaction chamber 111 through the liquid outlet 113 .

[0034] The neutralization device 100 further includes an aeration pipeline 120 for introducing carbon dioxide gas into the neutralization reaction chamber 111. The aeration pipeline 120 includes an aeration main pipe 121 and an aeration branch pipe 122. The input end of the aeration main pipe 121 is connected to a gas source for introducing carbon dioxide gas into the neutralization reaction chamber 111, and the output end is connected to the aeration branch pipe 122.

[0035] The aeration branch pipe 122 includes an aeration section 1221 and a submerged section 1222. Figure 2 As shown, the aeration section 1221 is located in the neutralization reaction chamber 111 , and aeration holes 1224 are provided on the aeration section 1221 .

[0036] Specifically, the aeration section 1221 refers to a pipe section in the aeration pipeline 120 disposed in the neutralization reaction chamber 111. Figure 2 As shown, the aeration hole 1224 on the aeration section 1221 refers to an opening on the aeration section 1221 , which is used to pass the carbon dioxide in the aeration pipeline 120 into the neutralization reaction chamber 111 .

[0037] In some embodiments, one aeration section 1221 may have a plurality of aeration holes 1224 .

[0038] In some embodiments, a plurality of aeration holes 1224 may be disposed at any position of the aeration section 1221. For example, Figure 3 As shown, the aeration holes 1224 may be distributed in a circular pattern on the aeration section 1221 .

[0039] In the specific implementation process, multiple aeration holes 1224 are evenly distributed in the neutralization reaction chamber 111, which can make the introduced carbon dioxide gas more evenly dispersed in the neutralization reaction chamber 111, so that the neutralization reaction occurs sufficiently, avoiding insufficient contact between the filtrate and carbon dioxide, which leads to reduced neutralization treatment efficiency of the filtrate.

[0040] In the embodiments of the present application, Figure 2 , Figure 5 As shown, the aeration section 1221 is connected to the aeration main pipe 121 through the submerged section 1222. The submerged section 1222 is a U-shaped structure with a three-way valve 1223 disposed at the bottom.

[0041] In some embodiments, the sinking section 1222 may be disposed at the lower side of the neutralization reaction chamber 111 to facilitate the filtrate in the neutralization reaction chamber 111 to flow into the sinking section 1222 based on gravitational potential energy.

[0042] The neutralization device 100 further includes a recovery device, which includes a buffer chamber 140 , and the third port of the three-way valve 1223 is in communication with the buffer chamber 140 .

[0043] Specifically, Figure 2 , Figure 5As shown, the submerged section 1222 is arranged at the lower part of the neutralization reaction chamber 111, and is connected to the aeration section 1221 and the aeration main pipe 121. When the gas source stops introducing carbon dioxide into the aeration pipeline 120, the three-way valve 1223 located at the bottom of the submerged section 1222 is controlled to connect the buffer chamber 140 with the housing 110. At this time, the filtrate in the neutralization reaction chamber 111 in the housing 110 will enter the aeration section 1221 through the aeration hole 1224. Since the submerged section 1222 is a U-shaped pipeline that is concave downward, the filtrate in the aeration section 1221 will continue to flow downward into the submerged section 1222 due to the gravitational potential energy, and then flow into the buffer chamber 140. At the same time, the filtrate will also discharge the carbon dioxide gas in the pipeline connecting the housing 110 and the buffer chamber 140 into the buffer chamber 140. At this time, only the filtrate is left in the pipeline connecting the housing 110 and the buffer chamber 140, and there is no carbon dioxide gas. Figure 6 , Figure 7 As shown, the gas-liquid pressure balance interface at the aeration port is removed, thereby preventing the two from reacting at the aeration hole 1224, and avoiding the generation and accumulation of precipitation at the aeration hole 1224. In addition, since the three-way valve 1223 closes the channel between the box 110 and the aeration main pipe 121, the filtrate cannot contact the residual carbon dioxide in the aeration main pipe 121, and thus cannot react chemically to generate precipitation. Therefore, in the entire pipeline, the separation of the filtrate and the carbon dioxide gas is achieved, the contact reaction between the two is avoided, the risk of blockage in the aeration pipeline 120 due to precipitation accumulation is reduced, the operation stability of the neutralization device 100 and the mixing station sewage treatment system is improved, and the maintenance frequency and maintenance cost are reduced.

[0044] In the embodiment of the present application, a U-shaped submerged section 1222 is provided on the aeration branch pipe 122, and the box body 110, the buffer chamber 140 and the aeration main pipe 121 are connected through a three-way valve 1223. The three-way valve 1223 can be controlled to dynamically control the introduction and stopping of carbon dioxide according to the use requirements of the mixing station sewage treatment system. In this process, when the introduction of carbon dioxide into the neutralization reaction chamber 111 is stopped, the filtrate in the neutralization reaction chamber 111, driven by gravitational potential energy, spontaneously flows into the submerged section 1222 through the aeration holes 1224 and is further discharged to the buffer chamber 140. This process can not only wash away the sediment accumulated at the aeration holes 1224, but also further discharge the carbon dioxide in the pipeline, breaking the two-phase equilibrium interface of the gas phase and the liquid phase inside the aeration holes 1224 and the pipeline, avoiding the contact between the carbon dioxide gas and the filtrate in the aeration holes 1224 or the aeration pipeline 120, thereby eliminating the problem of carbon dioxide gas and the filtrate generating sediment in the aeration holes 1224 or the aeration pipeline 120 and clogging the aeration holes 1224 or the aeration pipeline 120. At the same time, since the filtrate can be flushed when it flows into the aeration hole 1224, and at the same time, the aeration hole 1224 can also impact the sediment in the reverse direction when it is ventilated outward, the two directions are alternating, and the self-cleaning of the aeration pipeline 120 is realized, which saves the maintenance and cleaning work time of the maintenance personnel, reduces the cleaning cost, and further reduces the replacement and maintenance frequency of the aeration pipeline 120, reducing the maintenance cost of the system. Secondly, the opening and closing of the channel are adjusted by the three-way valve 1223, which can better adapt to the intermittent working rhythm of the mixing station sewage treatment system and has excellent adaptability. In addition, by collecting the outflowing filtrate through the buffer chamber 140, the flushed filtrate can be further recovered and filtered to avoid the discharge of untreated filtrate, realizing the functional closed loop of the mixing station sewage treatment system and improving the intelligence and automation of the system operation.

[0045] In some embodiments, the neutralization device 100 includes at least two aeration branches 122, and the aeration branch 122 intermittently performs aeration reflux during the aeration process to achieve self-cleaning of the aeration holes 1224. The aeration reflux is specifically as follows: during the neutralization process, the three-way valve 1223 is controlled to connect the housing 110 and the buffer chamber 140, and the carbon dioxide gas in the aeration branch 122 between the housing 110 and the buffer chamber 140 is discharged through the filtrate in the neutralization reaction chamber 111.

[0046] Specifically, Figure 2As shown, each aeration branch pipe 122 includes a submerged section 1222. In response to the neutralization device 100 not meeting the preset conditions, aeration reflux is performed, that is, the three-way valve 1223 of the corresponding aeration branch pipe 122 is controlled to connect the box body 110 and the buffer chamber 140, and the carbon dioxide gas in the aeration branch pipe 122 between the box body 110 and the buffer chamber 140 is discharged through the filtrate in the neutralization reaction chamber 111; in response to the neutralization device 100 meeting the preset conditions, the three-way valve 1223 of the corresponding aeration branch pipe 122 is controlled to connect the box body 110 and the aeration main pipe 121, and carbon dioxide gas is introduced into the neutralization reaction chamber 111. In the specific implementation process, the corresponding relationship between different preset conditions and the corresponding aeration branch pipes 122 that need to be regulated can be obtained according to the preset of the staff in this field.

[0047] In some embodiments, the preset condition is a limiting condition for regulating the execution of different operations of each aeration branch pipe 122 in the neutralization device 100, which can be obtained according to the preset by the staff in the field. Exemplarily, the preset condition can be that the time for introducing carbon dioxide gas does not exceed 1 hour. At this time, when the carbon dioxide gas is introduced into a certain aeration branch pipe 122 in the neutralization device 100 for more than 1 hour, and the preset condition is not met, the three-way valve 1223 connected to the aeration branch pipe 122 is controlled to connect the box body 110 and the buffer chamber 140, and the carbon dioxide gas in the aeration branch pipe 122 located between the box body 110 and the buffer chamber 140 is discharged through the filtrate in the neutralization reaction chamber 111; on the contrary, if the preset condition is met, the three-way valve 1223 connected to the aeration branch pipe 122 is controlled to connect the box body 110 and the aeration main pipe 121, and the carbon dioxide gas continues to be introduced into the neutralization reaction chamber 111.

[0048] For another example, the preset condition may be that the flow rate of the liquid inlet 112 of the neutralization reaction chamber 111 is lower than a flow rate threshold. If the preset condition is met, a certain aeration branch pipe 122 in the neutralization device 100 is used to introduce carbon dioxide, and the remaining aeration branch pipes 122 perform aeration reflux. The aforementioned flow rate threshold may also be preset by a person skilled in the art.

[0049] In the above embodiment, by setting a plurality of aeration branches 122, corresponding preset conditions can be set according to the working requirements of the wastewater treatment system of the mixing station, so that each aeration branch 122 performs different operations at the same time. During the aeration process, carbon dioxide is continuously output from the aeration holes 1224 to the neutralization reaction chamber 111. Figure 6As shown, a gas-liquid contact interface is formed on the outside of the aeration hole 1224, and the gas-liquid contact interface is very likely to produce precipitation products and accumulate near the outside of the aeration hole 1224. As the aeration time increases, the precipitation products near the aeration hole 1224 are likely to grow and extend toward the aeration hole 1224, causing the outside of the aeration hole 1224 to be blocked by the precipitation products. In this embodiment, multiple aeration branch pipes 122 are provided. Taking two aeration branch pipes 122 as an example, when one aeration branch pipe 122 is introducing carbon dioxide gas into the neutralization reaction chamber 111, the other aeration branch pipe 122 can transport the filtrate to the buffer chamber 140, that is, flush the aeration branch pipe 122. In this way, on the one hand, Figure 7 As shown, in the aerated state, the carbon dioxide gas fluid flows from the inside to the outside of the aeration hole 1224, and in the non-aerated state, the sewage fluid in the neutralization reaction chamber 111 flows from the outside of the aeration hole 1224 to the inside of the aeration hole 1224. The two fluids alternately flush the aeration hole 1224 in the opposite direction, which can take away the precipitation products outside the aeration hole 1224, thereby reducing the risk of clogging of the aeration hole 1224 during operation, improving the working stability and safety of the aeration pipe and the neutralization device 100, extending the maintenance cycle, reducing the maintenance frequency, and reducing the operating cost of the neutralization device 100 and the mixing station sewage treatment system. On the other hand, the cleaning operation of the aeration branch pipe 122 can be performed uninterruptedly while the neutralization reaction is being carried out, greatly saving the time spent on cleaning the aeration pipeline 120. At the same time, the aeration branch pipe 122 can be regulated to perform different operations based on preset conditions, and the dynamic control of the aeration pipeline 120 can also be realized, so that the mixing station sewage treatment system can be automatically operated, saving the time for sewage treatment and equipment cleaning, and improving its sewage treatment efficiency.

[0050] In some embodiments, the mixing station sewage treatment system further includes a separation device 200. The separation device 200 is disposed at the liquid inlet 112 of the housing 110, and is used to perform solid-liquid separation on the sewage, and transport the separated filtrate to the neutralization reaction chamber 111.

[0051] Sewage can be various industrial wastewater such as water generated by separation of waste concrete, washing water from production sites and some rainwater.

[0052] Specifically, Figure 4 As shown, the separation device 200 includes a sand and gravel separation device 210, a stirring tank 220, a plate and frame filter device 230 and a filtrate tank 240.

[0053] Among them, the separation steps of the separation device 200 are as follows: the sand and gravel in the sewage are separated by the sand and gravel separation equipment 210, and the sewage after the sand and gravel separation enters the stirring tank 220 through the connecting pipe. The stirring tank 220 works through the internal mixer to mix and stir the sewage. After the treatment is completed, the mixed and stirred sewage is sent to the plate and frame filter equipment 230 through the connecting pipe. The plate and frame filter equipment 230 filters the sewage and separates the sewage into mud and water. The sludge is transported out through the external transport device, and the separated water enters the filtrate tank 240. The filtrate tank 240 further filters the sewage to obtain the filtrate after filtration, and the filtrate is transported to the neutralization reaction chamber 111 through the liquid inlet 112 on the box body 110.

[0054] In some embodiments, the filtrate in the buffer chamber 140 can be transported to the separation device 200 through the recovery pipeline 131. Specifically, the filtrate in the buffer chamber 140 and the precipitate therein can be transported to the stirring tank 220 in the separation device 200, mixed and stirred together with the sewage in the stirring tank 220, and then continue to pass through the plate and frame filter device 230 and the filtrate tank 240, and then be transported to the neutralization reaction chamber 111 again.

[0055] In some embodiments, a variety of power devices may be provided in the recovery line 131 to pump the solid-liquid mixture in the buffer chamber 140 to the stirring tank 220. For example, a liquid pump may be provided in the recovery line 131.

[0056] Therefore, by recycling the filtrate in the buffer chamber 140 to the mixing tank 220 through the recovery pipeline 131, the filtrate in the buffer chamber 140 can be recycled, thereby improving the quality and efficiency of sewage treatment and realizing efficient and automated operation of the mixing station sewage treatment system.

[0057] In some embodiments, the bottom of the neutralization reaction chamber 111 further includes a slag discharge port 114 , which is connected to a recovery pipeline 131 , and the precipitate in the neutralization reaction chamber 111 is discharged to the separation device 200 through the recovery pipeline 131 .

[0058] Specifically, the slag discharge port 114 is an outlet for discharging the precipitate in the neutralization reaction chamber 111. The slag discharge port 114 is connected to the stirring tank 220 through the recovery pipeline 131, and then the precipitate in the neutralization reaction chamber 111 is discharged to the stirring tank 220 for treatment. At this time, the slag discharge port 114 and the buffer chamber 140 share the recovery pipeline 131, which can save pipelines as much as possible in the process of simultaneously recovering the circulating filtrate and the precipitate, avoiding the problem of high maintenance cost of the mixing station sewage treatment system due to redundant pipelines, further simplifying the system structure and reducing production costs.

[0059] In some embodiments, the mixing station sewage treatment system further includes a detection device 300. Figure 5 As shown, the detection device 300 is disposed at the liquid outlet 113 of the box 110 and is used to detect the pH value of the filtrate.

[0060] Specifically, the detection device 300 further includes a water reservoir 310. The detection device 300 is connected to the neutralization device 100 via a neutralization circulation pipeline 132, and the neutralization circulation pipeline 132 is configured to transport the filtrate to the neutralization device 100. For more information about the detection device 300, please refer to the following content.

[0061] The present application also includes a mixing station wastewater treatment method, which is performed based on the above-mentioned mixing station wastewater treatment system and includes aeration return.

[0062] The aforementioned aeration reflux includes: during the neutralization process, controlling the three-way valve 1223 to connect the box body 110 and the buffer chamber 140, and discharging the carbon dioxide gas in the aeration branch pipe 122 located between the box body 110 and the buffer chamber 140 through the filtrate in the neutralization reaction chamber 111.

[0063] In the non-aerated state, the sewage fluid in the neutralization reaction chamber 111 flows from the outside of the aeration hole 1224 to the inside of the aeration hole 1224, and flushes all the residual carbon dioxide gas in the aeration pipe 120 into the buffer chamber 140, breaking the gas-liquid equilibrium interface between the aeration hole 1224 and the inside of the aeration pipe 120, and preventing the precipitation generated by the reaction of the filtrate and the carbon dioxide gas from clogging the aeration hole 1224 or the aeration pipe 120.

[0064] In some embodiments, the neutralization device 100 includes at least two aeration branches 122 , and the aeration branches 122 intermittently perform aeration reflux during the aeration process. At least two aeration branches 122 alternately perform aeration reflux during the aeration process to achieve self-cleaning of the aeration holes 1224 .

[0065] In the above embodiment, by setting a plurality of aeration branches 122, corresponding preset conditions can be set according to the working requirements of the mixing station sewage treatment system, so that each aeration branch 122 can perform different operations at the same time. In the aeration state, carbon dioxide gas flows from the inside to the outside of the aeration hole 1224, and in the non-aeration state, the sewage in the neutralization reaction chamber 111 flows from the outside of the aeration hole 1224 to the inside of the aeration hole 1224, and the gas and liquid alternately flush the aeration hole 1224 and the existing sediment, thereby reducing the risk of clogging of the aeration hole 1224, improving the working stability and safety of the aeration pipeline 120, reducing the maintenance frequency, and reducing the operating cost of the mixing station sewage treatment system; in addition, while the neutralization reaction is in progress, the cleaning operation of the aeration branch 122 can be performed uninterruptedly, which greatly saves the time spent on cleaning the aeration pipeline 120, realizes dynamic control of the aeration pipeline 120, enables the automatic operation of the mixing station sewage treatment system, and improves its sewage treatment efficiency.

[0066] In some embodiments, the mixing station sewage treatment system further includes a separation device 200, which is configured to perform solid-liquid separation on the sewage and transport the separated filtrate to the neutralization reaction chamber 111. The mixing station sewage treatment method further includes recovery of anti-sedimentation liquid.

[0067] The aforementioned anti-sedimentation liquid recovery includes: conveying the filtrate in the buffer chamber 140 to the separation device 200 for solid-liquid separation.

[0068] By recycling the filtrate in the buffer chamber 140 and avoiding the discharge of untreated sewage, the degree of automation of the operation of the sewage treatment system of the mixing station can be further improved, and the efficiency of sewage treatment can be further improved.

[0069] In some embodiments, the mixing plant wastewater treatment method also includes centralized treatment.

[0070] The aforementioned centralized treatment includes: discharging the precipitate in the neutralization reaction chamber 111 to the separation device 200 for solid-liquid separation.

[0071] By discharging the precipitate to the separation device 200, the precipitate can be further recycled to prevent the precipitate from accumulating in the neutralization reaction chamber 111 and affecting the normal reaction process in the neutralization reaction chamber 111. At the same time, the maintenance requirements of the neutralization reaction chamber 111 are reduced, the self-cleaning efficiency of the neutralization device 100 is improved, unnecessary labor costs are reduced, and the service life of the neutralization device 100 is further increased.

[0072] In some embodiments, the mixing station wastewater treatment method further comprises backflow filtration,

[0073] Reflux filtration includes: in response to the interval time exceeding the time threshold, the filtrate and precipitate in the buffer chamber 140 are transported to the separation device 200 for solid-liquid separation through a liquid pump; and / or, in response to the volume of the filtrate in the buffer chamber 140 reaching the volume threshold, the filtrate is transported to the separation device 200 for solid-liquid separation.

[0074] In some embodiments, the time threshold is used to limit the time interval between the recovery pipeline 131 recovering the filtrate in the buffer chamber 140 and the precipitate discharged from the neutralization reaction chamber 111. The volume threshold is used to limit the storage volume of the filtrate in the recovery buffer chamber 140. In some embodiments, both the time threshold and the volume threshold can be preset and obtained by personnel in the field.

[0075] By judging the interval between the recovery of the filtrate and the sediment, or whether the volume of the filtrate in the buffer chamber 140 reaches a threshold, and recovering it, it is possible to avoid excessive accumulation of sediment in the neutralization reaction chamber 111, blocking the outlet for the sediment discharge, or excessive filtrate flowing into the buffer chamber 140, resulting in filtrate overflow and other problems. At the same time, recycling according to a certain time interval and the volume of the filtrate stored in the buffer chamber 140 can also avoid repeated recycling in a short time, waste of production resources and unnecessary machine operation wear, and improve the work efficiency of the recycling cycle process.

[0076] In some embodiments, the mixing station wastewater treatment method also includes cyclic neutralization.

[0077] The cyclic neutralization includes obtaining the pH value of the filtrate at the liquid outlet 113 of the box 110, and in response to the filtrate discharged from the neutralization reaction chamber 111 meeting the detection conditions, discharging the filtrate to the water reservoir 310; in response to the filtrate discharged from the neutralization reaction chamber 111 not meeting the detection conditions, transporting the filtrate to the neutralization device 100.

[0078] The detection condition is a condition for determining whether the filtrate after the neutralization reaction can be discharged. In some embodiments, the detection condition can be preset according to the staff in the field. Exemplarily, the detection condition can be that the pH value of the filtrate does not exceed 7.

[0079] When the filtrate does not meet the detection conditions, the filtrate can be transported to the neutralization reaction device through the neutralization circulation pipeline 132 for re-reaction and further neutralization, thereby improving the treatment quality of the sewage treatment and optimizing the treatment effect of the sewage treatment.

[0080] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0081] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A wastewater treatment system for a mixing station, characterized in that: The invention comprises a neutralization device (100), wherein the neutralization device (100) comprises: A box body (110), wherein a neutralization reaction chamber (111) is disposed in the box body (110), and a liquid inlet (112) and a liquid outlet (113) which are in communication with the neutralization reaction chamber (111) are disposed on the box body (110); an aeration pipeline (120), the aeration pipeline (120) being used to introduce carbon dioxide gas into the neutralization reaction chamber (111), the aeration pipeline (120) comprising an aeration main pipe (121) and an aeration branch pipe (122), The input end of the aeration main pipe (121) is connected to the air source. The aeration branch pipe (122) comprises an aeration section (1221) and a sinking section (1222); the aeration section (1221) is located in the neutralization reaction chamber (111); an aeration hole (1224) is provided on the aeration section (1221); the aeration section (1221) is connected to the aeration main pipe (121) via the sinking section (1222); the sinking section (1222) is a U-shaped structure, and a three-way valve (1223) is provided at the bottom; The recycling device comprises a cache chamber (140), wherein the third port of the three-way valve (1223) is in communication with the cache chamber (140).

2. The mixing station sewage treatment system according to claim 1, characterized in that: The neutralization device (100) comprises at least two aeration branch pipes (122), wherein the aeration branch pipes (122) intermittently perform aeration reflux during the aeration process to achieve self-cleaning of the aeration holes (1224). The aeration reflux is specifically as follows: during the neutralization process, the three-way valve (1223) is controlled to connect the housing (110) and the buffer chamber (140), and the carbon dioxide gas in the aeration branch pipe (122) located between the housing (110) and the buffer chamber (140) is discharged through the filtrate in the neutralization reaction chamber (111).

3. The mixing station sewage treatment system according to claim 1, characterized in that: The mixing station sewage treatment system further comprises a separation device (200), the separation device (200) being arranged at the liquid inlet (112) of the housing (110) and being used for performing solid-liquid separation on the sewage and conveying the separated filtrate to the neutralization reaction chamber (111); The filtrate in the buffer chamber (140) is transported to the separation device (200) via a recovery pipeline (131).

4. The mixing station sewage treatment system according to claim 3, characterized in that: The bottom of the neutralization reaction chamber (111) further comprises a slag discharge port (114), the slag discharge port (114) being in communication with the recovery pipeline (131), and the precipitate in the neutralization reaction chamber (111) is discharged to the separation device (200) through the recovery pipeline (131).

5. A method for treating wastewater in a mixing station, characterized in that: The method is performed based on the mixing plant sewage treatment system according to any one of claims 1 to 4, and the method includes aeration return, The aeration reflux: during the neutralization treatment process, the three-way valve (1223) is controlled to connect the box body (110) and the buffer chamber (140), and the carbon dioxide gas in the aeration branch pipe (122) between the box body (110) and the buffer chamber (140) is discharged through the filtrate in the neutralization reaction chamber (111).

6. The method for treating wastewater from a mixing station according to claim 5, characterized in that: The method further comprises: the neutralization device (100) comprises a plurality of aeration branch pipes (122), the aeration branch pipes (122) intermittently perform the aeration reflux during an aeration process, and at least two of the aeration branch pipes (122) alternately perform the aeration reflux during an aeration process to achieve self-cleaning of the aeration holes (1224).

7. The method for treating wastewater from a mixing station according to claim 5, characterized in that: The mixing station sewage treatment system further comprises a separation device (200), wherein the separation device (200) is configured to perform solid-liquid separation on the sewage and transport the separated filtrate to the neutralization reaction chamber (111). The method comprises recovering the precipitation prevention liquid, Recovery of the anti-precipitation liquid: The filtrate in the buffer chamber (140) is transported to the separation device (200) for solid-liquid separation.

8. The method for treating wastewater from a mixing station according to claim 7, characterized in that: The method comprises centralized processing, The centralized treatment: discharges the precipitate in the neutralization reaction chamber (111) to the separation device (200) for solid-liquid separation.

9. The method for treating wastewater from a mixing station according to claim 8, characterized in that: The method further comprises backflow filtration, The reflux filtration: in response to the interval time exceeding the time threshold, the filtrate and the precipitate in the buffer chamber (140) are transported to the separation device (200) for solid-liquid separation; And / or, in response to the volume of the filtrate in the buffer chamber (140) reaching a volume threshold, the filtrate is transported to the separation device (200) for solid-liquid separation.

10. The method for treating wastewater from a mixing station according to claim 5, characterized in that: The method further comprises cyclic neutralization, The circulating neutralization: obtaining the pH value of the filtrate at the liquid outlet (113) of the housing (110), and in response to the filtrate discharged from the liquid outlet (113) meeting a detection condition, discharging the filtrate into a water reservoir (310); In response to the filtrate discharged from the liquid outlet (113) not satisfying the detection condition, the filtrate is transported to a neutralization device (100).

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