Device for reducing drop oxygen enrichment of pretreated effluent of sewage treatment plant

Abstract

The utility model discloses a device for reducing water fall oxygen enrichment of pretreatment effluent of a sewage treatment plant, which comprises an upper tank body and a lower tank body, a pipeline is connected between the upper tank body and the lower tank body, the pipeline is provided with an inlet in the upper tank body and an outlet in the lower tank body, and a flow guide buffer partition plate is arranged in the pipeline. A flow guide buffer partition plate is arranged in the pipeline and divides an inner cavity of the pipeline into a plurality of flow channels, a floating ball sealing device is arranged at the position of the inlet and used for preventing air from entering the pipeline when water in the upper pool body flows into the pipeline, and a water outlet cover is arranged at the position of the outlet and connected to the end of the pipeline. According to the device for reducing the drop oxygen enrichment of the pretreated effluent of the sewage treatment plant, drop oxygen enrichment at the outlet of the grit chamber in the pretreatment section, the effluent weir of the primary sedimentation tank and the like can be avoided, a good anaerobic environment of a subsequent biochemical tank is guaranteed, the consumption of a carbon source is reduced, a carbon source agent is saved, and the effects of reducing cost and improving efficiency of the sewage treatment plant are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and particularly relates to a device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant. Background Art

[0002] As more stringent pollutant emission standards for urban sewage treatment plants are introduced in various places, higher requirements are put forward for nitrogen removal and phosphorus removal in sewage treatment plants. In order to ensure the stability of nitrogen removal and phosphorus removal in sewage treatment plants, sufficient carbon sources are needed. According to the theory of biological nitrogen removal and phosphorus removal, the BOD5 / TN required for biological denitrification is 6~7. If the impact of sludge discharge is considered at the same time, the BOD5 / TN required for biological denitrification is usually 5~6. Due to the imperfect construction of sewage pipe networks or incomplete collection of sewage, most urban sewage treatment plants are facing a serious shortage of carbon sources for influent. According to the statistical results of more than 3,000 urban sewage treatment plants across the country, less than 20% of the annual average BOD5 / TN values ​​reach 5 or above, and more than 40% of sewage treatment plants have a BOD5 / TN of less than 3. Without the addition of external carbon sources, the stable compliance of nitrogen and phosphorus is greatly affected, which is even worse in winter. Therefore, external carbon sources must be added to assist in nitrogen removal and phosphorus removal.

[0003] The optimization of carbon source utilization and internal carbon source development in urban sewage treatment plants have recently attracted widespread attention from experts and scholars at home and abroad, but the problems of oxygen enrichment and carbon source loss in the pretreatment stage have not received enough attention. Research on oxygen enrichment in the pretreatment stage of sewage treatment plants shows that dissolved oxygen usually increases by more than 3 mg / L after each drop, and the corresponding organic matter is consumed in the subsequent pipelines, channels or pools. In some sewage treatment plants, oxygen enrichment and oxygen consumption will lead to 5~10 mg / L or even higher carbon source losses, which will have an adverse effect on nitrogen removal and phosphorus removal. According to industry research results, oxygen enrichment in the drop mainly occurs at the moment of sewage drop. The amount of oxygen enrichment is related to factors such as the closure status of the drop area, the channel structure and the type of drop outlet. The correlation with the drop height is not significant, and the oxygen enrichment in the drop process can be ignored.

[0004] During the years of sewage treatment operation and evaluation, the research team found that most urban sewage treatment plants have waterfall areas at the outlet of the water inlet pump, the outlet of the grit chamber, the outlet weir of the primary sedimentation tank, etc., and the oxygen enrichment caused by the waterfall is obvious; the oxygen-enriched sewage has different degrees of organic matter consumption in the water channel, pipeline, grit chamber, primary sedimentation tank and other structures, further exacerbating the problem of insufficient carbon source. In combination with the characteristics of the waterfall area, the research team proposed a device to reduce the oxygen enrichment of the pre-treated effluent waterfall of the sewage treatment plant, mainly by taking engineering measures to inhibit air circulation in the waterfall area, thereby reducing carbon source consumption and improving the efficiency of nitrogen and phosphorus removal. Utility Model Content

[0005] The utility model aims to solve the problems existing in the prior art by providing a device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant.

[0006] The technical purpose of this utility model is achieved through the following technical solutions:

[0007] A device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant comprises an upper tank body and a lower tank body, wherein a pipe is connected between the upper tank body and the lower tank body, wherein the pipe is provided with an inlet in the upper tank body and an outlet in the lower tank body, wherein a flow guide buffer baffle is provided in the pipe, wherein the flow guide buffer baffle divides the inner cavity of the pipe into a plurality of flow channels, wherein a float sealing device is provided at the inlet, wherein the float sealing device is used to prevent air from entering the pipe when water in the upper tank body flows into the pipe, wherein a water outlet cover is provided at the outlet, wherein the water outlet cover is connected to the end of the pipe.

[0008] Preferably, the float sealing device comprises a fixed plate, the fixed plate is connected to the top of the pipeline, a flexible plate is connected to the fixed plate, and a float is connected to the bottom of the flexible plate.

[0009] Preferably, the water outlet cover is closed at the top and open at the bottom, and two sides of the water outlet cover are provided with drainage plates pointing vertically downward.

[0010] Preferably, a fixed base is provided at the bottom of the lower pool body, a fixing belt is connected to the fixed base, and the fixing belt connects the pipeline to the fixed base through fixing bolts.

[0011] Preferably, the cross section of the pipe is rectangular.

[0012] Preferably, the guide buffer baffle is arranged horizontally or vertically in the pipeline.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model provides a device for reducing oxygen enrichment of pre-treated effluent waterfalls in sewage treatment plants, which can avoid oxygen enrichment of waterfalls at the outlet of the pre-treatment sand tank and the outlet weir of the primary sedimentation tank, ensure a good anaerobic environment for the subsequent biochemical pool, reduce carbon source consumption, save carbon source agents, and achieve the effect of reducing costs and increasing efficiency of sewage treatment plants.

[0015] 2. The utility model can effectively separate the sewage about to fall from the air, reduce the oxygen carrying capacity of the sewage, block the air from entering the sealed pipe, make the pipe in an anaerobic environment, and avoid the occurrence of oxygen-enriched process.

[0016] 3. The closed pipe water outlet cover of the utility model changes the air exchange fluidity in the upper part of the waterfall area through the closed box and the pipe submerged combination, reduces air contact, reduces the air-water mixing effect, thereby reducing the impact of dissolved oxygen on denitrification, ensuring that the effluent water quality can stably meet the effluent standards, and has obvious environmental benefits.

[0017] 4. The equipment used in the utility model is simple, and only includes pipes, rubber and some bolts. The equipment has low manufacturing cost, strong practicality and is worthy of promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of an embodiment of the utility model.

[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of part C in the middle.

[0020] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part B in the middle.

[0021] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the AA axis.

[0022] Figure 5 for Figure 1 Schematic diagram of the top view structure.

[0023] In the above drawings:

[0024] 1. Upper tank body; 2. Lower tank body; 3. Pipeline; 4. Inlet; 5. Outlet; 6. Diversion buffer baffle; 7. Float sealing device; 71. Fixed plate; 72. Flexible plate; 73. Float; 8. Water outlet cover; 81. Drainage plate; 9. Fixed base; 91. Fixed belt; 92. Fixed bolts. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] As a preferred embodiment of the utility model, a device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant is as follows: Figure 1-Figure 5As shown, this embodiment provides a device for reducing oxygen enrichment of pretreated effluent from a sewage treatment plant, comprising an upper tank body 1 and a lower tank body 2, wherein a pipe 3 is connected between the upper tank body 1 and the lower tank body 2, wherein the pipe 3 is provided with an inlet 4 in the upper tank body 1 and an outlet 5 in the lower tank body 2, wherein a guide buffer baffle 6 is provided in the pipe 3, wherein the guide buffer baffle 6 divides the inner cavity of the pipe 3 into a plurality of flow channels, wherein a float sealing device 7 is provided at the inlet 4, wherein the float sealing device 7 is used to prevent air from entering the pipe 3 when water in the upper tank body 1 flows into the pipe 3, wherein a water outlet hood 8 is provided at the outlet 5, wherein the water outlet hood 8 is connected to the end of the pipe 3.

[0027] Specifically, Figure 2 As shown, the float sealing device 7 includes a fixed plate 71 , the fixed plate 71 is connected to the top of the pipe 3 , a flexible plate 72 is connected to the fixed plate 71 , and a float 73 is connected to the bottom of the flexible plate 72 .

[0028] In some preferred embodiments, the water outlet cover 8 is closed at the top and open at the bottom, and vertical downward guide plates 81 are provided on both sides of the water outlet cover 8 .

[0029] In some preferred embodiments, Figure 3 As shown, in order to better fix the pipeline and prevent the pipeline from vibrating or shaking during operation, this embodiment provides a fixed base 9 at the bottom of the lower pool body 2, and a fixing belt 91 is connected to the fixed base 9. The fixing belt 91 connects the pipeline 3 to the fixed base 9 through a fixing bolt 92. The pipeline is fixedly connected to the fixed base 9 through the fixing belt 91, which can improve the stability of the pipeline during operation.

[0030] In other embodiments, Figure 4 or Figure 5 As shown, the cross section of the pipe 3 is a rectangle, and the guide buffer baffle 6 is arranged horizontally or vertically in the pipe 3. Of course, this does not mean that the utility model can only use pipes with a rectangular cross section, and can also use pipes with other cross-sectional shapes such as square and circular cross sections.

[0031] When working, Figure 1As shown in the figure, the arrow direction represents the wake direction. The float sealing device 7 can separate the sewage that is about to fall from the external air. The float sealing device 7 can be made of rubber material. The float is hollow inside. The specific size can be adjusted according to the weight of the upper rubber, but it should be submerged 40-80% of the water surface in general. The installation position of the float sealing device 7 should be 50-100cm in front of the sewage fall; the pipeline 3 is fixed to the upper pool body by fixing bolts, and the fixing position should be 50-100cm in front of the sewage fall; after the sewage passes through the float sealing device 7, it flows into the pipeline 3 through the gap between the diversion buffer partition 6. The diversion buffer partition 6 is made of stainless steel with a thickness of 10-50mm. It can be arranged in parallel in several rows according to the size of the pipeline, and the interval should be kept between 10-30cm to ensure that the water is filled in each gap and minimize the intake of air; the pipeline 3 can be made of ductile iron, with a width consistent with the water surface width of the upper pool body 2 and a thickness of 40- 80mm, the pipe 3 can be vertical or inclined from the upper tank body 2 to the fixed base 9 of the lower tank body 1, and the angle between it and the horizontal plane can be 45-90°; the fixed base 9 fixes the pipe 3 by fixing bolts 91 and fixing belts 92 to prevent vibration caused by water flow, the width of the fixed base is consistent with the width of the pipe, the height can be set to between 30-100cm according to the depth of the lower tank body, and the thickness should be between 80%-150% of the arc radius of the lower part of the pipe 3; after the water flows through the pipe, the water flows through the water outlet cover 8 and flows into the lower tank body 2. The water outlet cover 8 is made of stainless steel and is set 100-150cm below the water surface of the lower tank body 12. The front and rear widths are consistent with the pipe width, and the left and right widths can be calculated based on fluid mechanics. The maximum width should be able to meet 150% of the designed water flow to meet the requirements of 1.5Q (1.5 times the designed treated water volume) of the sewage treatment plant; the effluent enters the lower tank body 2 after passing through the water outlet cover 8, and finally flows into the next structure through the water outlet pipe. The sewage does not come into contact with the air during the whole process from flowing into the float sealing device 7 to flowing out of the water outlet cover 8. Only a small amount of air carried by the sewage in the pipeline evaporates and is discharged from the pipeline along with the water flow, thus reducing the oxygen enrichment of the sewage.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant, comprising an upper tank body and a lower tank body, characterized in that: A pipe is connected between the upper pool body and the lower pool body. The pipe is provided with an inlet in the upper pool body and an outlet in the lower pool body. A flow guide buffer baffle is provided in the pipe, and the flow guide buffer baffle divides the inner cavity of the pipe into multiple flow channels. A float sealing device is provided at the inlet, and the float sealing device is used to prevent air from entering the pipe when water in the upper pool body flows into the pipe. A water outlet cover is provided at the outlet, and the water outlet cover is connected to the end of the pipe.

2. A device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant according to claim 1, characterized in that: The floating ball sealing device comprises a fixed plate, the fixed plate is connected to the top of the pipeline, the fixed plate is connected to a flexible plate, and the bottom of the flexible plate is connected to a floating ball.

3. The device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant according to claim 1, characterized in that: The water outlet cover is closed at the top and open at the bottom, and both sides of the water outlet cover are provided with drainage plates extending vertically downwards.

4. The device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant according to claim 1, characterized in that: A fixed base is provided at the bottom of the lower pool body, a fixing belt is connected to the fixed base, and the fixing belt connects the pipeline to the fixed base through fixing bolts.

5. The device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant according to claim 1, characterized in that: The cross section of the pipe is rectangular.

6. The device for reducing oxygen enrichment of pre-treated effluent from a sewage treatment plant according to claim 1, characterized in that: The flow guide buffer baffle is arranged horizontally or vertically in the pipeline.

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