Device for recovering solvent from sewage water

Abstract

The utility model provides a device for recycling solvent in sewage, belongs to sewage treatment technical field, include: the pool body of sewage pool, there is multiple partition wall in the pool body and divides the pool body into a plurality of compartments, every compartment inside is equipped with a partition with the vertical partition wall, the partition divides the compartment into water inlet cavity and flow cavity, every partition wall all is installed with the communicating pipe for the adjacent two compartments, the water inlet end of communicating pipe is located in the flow cavity of last compartment, and the water outlet end is located in the water inlet cavity of next compartment, the water outlet pipe is arranged in the flow cavity of the compartment of rightmost side, every compartment is placed with the floating oil collector, and the oil outlet of every floating oil collector is connected to the suction pump inlet place outside the pool body through the hose respectively, and the outlet of suction pump is connected with solvent recovery jar. The device uses the floating effect of density difference of organic solvent and water to remove the floatability solvent in sewage, and the absorption floating oil efficiency is high, the oil -water separation precision is high, and the recovery effect is good.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a device for recovering solvents from wastewater. Background Technology

[0002] In existing technologies, the anthraquinone process is the most important method for producing hydrogen peroxide. The process involves preparing a working solution of alkyl anthraquinone with an organic solvent, and then hydrogenating it by introducing hydrogen gas under conditions of 0.30 MPa pressure, 55-65℃ temperature, and the presence of a catalyst. The solution is then subjected to countercurrent oxidation with air (or oxygen) at 40-44℃. After extraction, regeneration, purification, and concentration, a hydrogen peroxide aqueous solution with a mass fraction of 20-30% is obtained.

[0003] In the anthraquinone process for producing hydrogen peroxide, some impurities need to be intermittently discharged from the production system. These mainly include: wastewater from the oxidation tower, raffinate metering tank, alkali separator, clay bed, and working fluid preparation vessel. The wastewater pond is the final destination for these wastewater discharges. Because the wastewater carries some working fluid and solvent during the discharge process, to save production costs, the wastewater is collected in the wastewater pond, where the solvent is initially recovered before being sent to the wastewater treatment unit for purification.

[0004] In current technology, solvent recovery involves waiting for the wastewater to settle in the wastewater tank for a period of time, after which the oily solvent separates from the water. Then, the oily solvent is directly extracted from above using a hose. However, as extraction proceeds, the position of the oil-water interface changes, making it difficult to control the inlet position of the hose. This can easily lead to the extraction of wastewater below the solvent as well. The recovery method is relatively simple, with low separation accuracy, high manual labor intensity, and poor recovery effect.

[0005] Therefore, there is a need for a device that has high recovery efficiency, high separation accuracy, and good separation and recovery effect for recovering solvents from wastewater. Utility Model Content

[0006] This invention provides a device for recovering solvents from wastewater with high separation accuracy, good oil-water separation effect, and excellent recovery effect, in order to solve the problems of single recovery method, low separation accuracy, high manual labor intensity, and poor recovery effect in the prior art.

[0007] This utility model provides a device for recovering solvents from wastewater, comprising: a wastewater tank, the wastewater tank including a cuboid-shaped tank body; multiple partition walls arranged in an array along the length of the tank body, dividing the tank body into multiple independent compartments arranged side by side; an inlet pipe is provided on the rear wall of the leftmost compartment, and an outlet pipe is provided on the lower part of the right wall of the rightmost compartment; each compartment is equipped with a partition plate inside, the partition plate being perpendicular to the partition wall, the height of the partition plate being less than the height of the tank body, and the top and bottom of the partition plate being flush with the top and bottom of the tank body. There are gaps; partitions divide the compartments into inlet chambers and flow chambers; each partition wall is equipped with a connecting pipe to connect two adjacent compartments, with the inlet end of the connecting pipe located in the flow chamber of the upper compartment and the outlet end located in the inlet chamber of the lower compartment; the outlet pipe is located in the flow chamber of the rightmost compartment; each compartment contains at least one oil floater, and the oil outlet of each oil floater is connected via a hose to the inlet of a suction pump located outside the tank, with the outlet of the suction pump connected to a solvent recovery tank.

[0008] Preferably, the leftmost compartment has a basket grille in its water inlet chamber, and the water outlet of the water inlet pipe is located in the basket grille.

[0009] Preferably, each partition wall is provided with a through hole, and a connecting pipe is installed in the through hole; each connecting pipe is an inverted U-shaped pipe, and the length of the inlet pipe side of the connecting pipe is greater than the length of its outlet pipe side; the distance between the inlet port of each connecting pipe and the bottom of the pool body does not exceed 300mm.

[0010] Preferably, the baffle is positioned near the inlet pipe, such that the length of the flow chamber is greater than the length of the inlet chamber; the connecting pipes are staggered in the pool.

[0011] Preferably, each flow cavity is further provided with multiple baffles, which are perpendicular to the partition wall and arranged in an array along the length of the flow cavity; the central axes of the baffles and the partition wall are aligned.

[0012] Preferably, the height of the baffle is greater than the height of the partition and less than the height of the pool body, and there are gaps between the top and bottom of the baffle and the top and bottom of the pool body.

[0013] Preferably, the top of the pool is provided with a cover plate, which is used to cover the pool; the cover plate is provided with ventilation holes.

[0014] Preferably, there are three partition walls, which divide the pool into four independent compartments arranged side by side.

[0015] The device for recovering solvents from wastewater provided by this utility model extends the residence time of wastewater in the tank through multi-stage compartments. Then, it uses the buoyancy generated by the density difference between organic solvents and water to collect floatable solvents in the wastewater. At the same time, the partitions and baffles make the wastewater flow up and down, increasing the water flow path. During this process, the flow direction and flow potential energy of the water and solvent are also changed, so that the solvents entrained or suspended in the water can be separated more thoroughly, and the overall efficiency of oil-water separation in the tank is significantly improved.

[0016] The oil float collector in this device can collect the solvent that accumulates in the upper layer of the compartment and extract it through a suction pump to store it in a solvent recovery tank for purification and recycling, making oil-water separation more thorough, with high oil float absorption efficiency and high oil-water separation precision. The basket grid can effectively block and separate solid impurities mixed in the wastewater at the inlet pipe, achieving a preliminary filtration effect. The entire device has a simple structure, is convenient and practical, has low preparation cost, and good solvent recovery effect, solving the problems of single recovery method, low separation precision, high manual labor intensity, and poor recovery effect in existing technologies. Attached Figure Description

[0017] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of a device for recovering solvents from wastewater according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a sewage tank provided in one embodiment of the present invention; Figure 3 for Figure 2 A schematic diagram of the structure in the AA direction; Figure 4 This is a top view of a sewage tank provided in one embodiment of the present invention.

[0019] Explanation of reference numerals in the attached figures: 1. Sewage tank; 2. Partition wall; 3. Inlet pipe; 4. Outlet pipe; 5. Suction pump; 6. Solvent recovery tank; 7. Oil float collector; 8. Cover plate; 9. Vent hole; 10. Tank body; 11. Partition plate; 12. Inlet chamber; 13. Flow chamber; 14. Connecting pipe; 15. Basket grid; 16. Baffle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are also within the protection scope of this utility model.

[0021] like Figures 1-3 This utility model discloses a device for recovering solvents from wastewater, comprising: a wastewater tank 1, which includes a rectangular tank body 10; multiple partition walls 2 arranged in an array along the length of the tank body 10, dividing the tank body 10 into multiple independent compartments arranged side by side; an inlet pipe 3 is provided on the rear wall of the leftmost compartment, and an outlet pipe 4 is provided on the lower part of the right wall of the rightmost compartment; each compartment is provided with a partition plate 11, which is perpendicular to the partition wall 2, and the height of the partition plate 11 is less than the height of the tank body 10, with the top and bottom of the partition plate 11 being separated from the top and bottom of the tank body 10. In the gap; the partition 11 divides the compartment into an inlet chamber 12 and a flow chamber 13; each partition wall 2 is equipped with a connecting pipe 14 to connect two adjacent compartments, the inlet end of the connecting pipe 14 is located in the flow chamber 13 of the upper compartment, and the outlet end of the connecting pipe 14 is located in the inlet chamber 12 of the lower compartment; the outlet pipe 4 is set in the flow chamber 13 of the rightmost compartment; each compartment is equipped with at least one oil floater 7, and the oil outlet of each oil floater 7 is connected to the inlet of a suction pump 5 located outside the tank body 10 through a hose, and the outlet of the suction pump 5 is connected to a solvent recovery tank 6.

[0022] Wastewater containing oily working fluid solvent enters the wastewater tank 10 through the inlet pipe 3. It is buffered and intercepted by the baffle 11 in the leftmost compartment, reducing the wastewater flow rate and minimizing the impact of the turbulence from the inlet pipe 3 on the separated oil and water in the flow chamber 13. After being buffered by the baffle 11, the solvent in the wastewater floats to the top while the water sinks. Water enters the flow chamber 13 from the bottom of the baffle 11, while the solvent overflows into the flow chamber 13 from the top of the baffle 11. As the wastewater flows in the flow chamber 13, the density difference between the organic solvent and water further facilitates oil-water separation through buoyancy. In the flow chamber 13, the sewage enters the next compartment through the connecting pipe 14 by liquid self-pressure. The connecting pipe 14 mainly carries water from the lower part, with a small amount of solvent. After being buffered by the partition 11 in the next compartment, the sewage continues to flow and separate in the flow chamber 13, and then enters the next compartment to repeat the above process. The sewage is separated several times by the partition walls 2 in the pool until the sewage in the last compartment no longer contains oily solvent. The solvent-free sewage is then discharged to the wastewater treatment unit for purification through the outlet pipe 4.

[0023] The oil float collector 7 can be selected from the commonly used structures in the existing technology. The oil float collector 7 will automatically adjust its position in the sewage, usually located at the oil-water interface. The solvent in the upper layer of the compartment is collected by the oil float collector 7. The oil outlet of the oil float collector 7 is connected to the suction pump 5 through a hose. The suction pump 5 extracts the upper layer of oily solvent, making the oil-water separation more thorough. The extracted solvent is stored in the solvent recovery tank 6 for purification and recycling.

[0024] This device utilizes multi-stage compartments in the sewage tank 1 to extend the residence time of sewage in the tank body 10. Then, it uses the buoyancy effect caused by the density difference between organic solvent and water to collect the floatable solvent in the sewage, so that the water and solvent can be better separated, improving the oil-water separation effect. Then, the oil floater 7 is used to collect and pump the solvent, making the oil-water separation more thorough, with high oil absorption efficiency and high oil-water separation accuracy. The whole device has a simple structure, is convenient and practical, has low preparation cost, and good solvent recovery effect. It solves the problems of single recovery method, low separation accuracy, high manual labor intensity, and poor recovery effect in the existing technology.

[0025] like Figure 3 As a preferred embodiment of this technical solution, a basket grille 15 is provided in the water inlet chamber 12 of the leftmost compartment, and the water outlet of the water inlet pipe 3 is located in the basket grille 15. The basket grille 15 can effectively block and separate solid impurities mixed in the wastewater at the water inlet pipe 3, achieving a preliminary filtration effect, facilitating subsequent oil-water separation, and preventing the deposition of solid impurities in the tank 10. The basket grille 15 can be removed from the tank 10 at any time for easy cleaning of impurities and daily maintenance.

[0026] like Figure 2 and Figure 3 As a preferred embodiment of this technical solution, each partition wall 2 is provided with a through hole, and a connecting pipe 14 is installed in the through hole; each connecting pipe 14 is an inverted U-shaped pipe, and the length of the inlet pipe 3 side of the connecting pipe 14 is greater than the length of its outlet pipe 4 side; the distance between the inlet port of each connecting pipe 14 and the bottom of the pool body 10 does not exceed 300mm. The inlet port of the connecting pipe 14 is located near the bottom of the pool body 10 and away from the upper oily solvent, which can send the lower water to the next compartment and also avoid the upper solvent being carried away as much as possible.

[0027] like Figure 3 and Figure 4As a preferred embodiment of this technical solution, the baffle 11 is positioned near the inlet pipe 3, such that the length of the flow chamber 13 is greater than the length of the inlet chamber 12; the connecting pipes 14 are staggered in the tank body 10. The inlet chamber 12 has a more significant buffering effect, while the flow chamber 13 has a more significant settling and stratification effect. During the slow flow of sewage into the flow chamber 13, the solvents entrained in the sewage can float better. Therefore, the length of the flow chamber 13 is preferably greater than the length of the inlet chamber 12. The inlet pipe 3 side of the connecting pipe 14 is located in the flow chamber 13 of the upper compartment, while the outlet pipe 4 side is located in the inlet chamber 12 of the lower compartment. Therefore, the connecting pipes 14 are staggered in the tank body 10.

[0028] like Figure 3 and Figure 4 As a preferred embodiment of this technical solution, each flow chamber 13 is further provided with multiple baffles 16, which are perpendicular to the partition wall 2 and arranged in an array along the length of the flow chamber 13; the baffles 16 are arranged to coincide with the central axis of the partition wall 11. More preferably, the height of the baffles 16 is greater than the height of the partition wall 11 and less than the height of the tank body 10, and there are gaps between the top and bottom of the baffles 16 and the top and bottom of the tank body 10. The left and right ends of the baffles 16 and the partition wall 11 are connected to the tank wall and the partition wall 2, and the water and solvent can only flow through the gaps below or overflow from above, causing the sewage to move up and down, increasing the water flow path, and changing the flow direction and flow potential energy of the water and solvent, thereby enabling the solvent entrained or suspended in the water to be separated more thoroughly, and significantly improving the overall oil-water separation efficiency of the tank body 10.

[0029] like Figure 1 As a preferred embodiment of this technical solution, the top of the pool body 10 is provided with a cover plate 8, which is used to seal the pool body 10; the cover plate 8 is provided with a vent hole 9. The cover plate 8 may also have a notch for placing a flexible tube for extracting solvent. The vent hole 9 allows the gas inside the pool body 10 to communicate with the outside atmosphere, balancing the internal and external air pressure and preventing solvent odor leakage. The pool body 10 and the partition wall 2 can be constructed of concrete, bricks, or stainless steel, and movable components such as the partition plate 11, baffle plate 16, and cover plate 8 are preferably constructed of corrosion-resistant stainless steel.

[0030] As a preferred embodiment of this technical solution, there are three partition walls 2, which divide the tank 10 into four independent compartments arranged side by side. While increasing the number of partition walls 2 within the tank 10 increases the number of oil-water separation cycles and improves the separation effect, a higher number of partition walls 2 also increases the cost of the device; therefore, the number of partition walls 2 should not be excessive. Preferably, the tank 10 is equipped with three partition walls 2, allowing for four stages of wastewater separation treatment. The wastewater in the last compartment is essentially free of solvent, resulting in good oil-water separation and solvent recovery.

[0031] It should be noted that arrows without reference numerals indicate the flow direction of gas-liquid mixtures, gas phases, or liquid phases.

[0032] The present invention will be further described in detail below with reference to specific embodiments. Example 1

[0033] The device for recovering solvents from wastewater operates by using three partition walls 2 within the wastewater tank 10, dividing the tank 10 into four independent compartments arranged side-by-side. Wastewater containing oily working fluid solvent enters the tank 10 through the inlet pipe 3. The basket screen 15 effectively blocks and separates solid impurities mixed in with the wastewater at the inlet pipe 3, achieving a preliminary filtration effect. The incoming water is buffered and intercepted by the partition 11 in the leftmost compartment. The solvent in the wastewater floats to the top, while the water sinks. Water enters the flow chamber 13 from the bottom of the partition 11, while the solvent overflows from the top of the partition 11 into the flow chamber 13. As the wastewater flows in the flow chamber 13, the density difference between the organic solvent and water further facilitates oil-water separation through buoyancy.

[0034] In the flow chamber 13, wastewater is drawn into the next compartment by liquid self-pressure through a connecting pipe 14 installed in a through hole on the partition wall 2. The inlet port of the connecting pipe 14 is located near the bottom of the tank 10 and away from the upper oily solvent, which can send the lower water into the next compartment and also avoid the upper solvent being carried away as much as possible. After being buffered by the partition 11 in the inlet chamber 12 of the next compartment, the wastewater continues to flow into the flow chamber 13 for flow and separation, and then enters the next compartment to repeat the above process, until the wastewater in the last compartment basically does not contain oily solvent. The solvent-free wastewater is discharged to the wastewater treatment unit for purification treatment through the outlet pipe 4.

[0035] Each compartment also contains an oil float collector 7, which is usually located at the oil-water interface. The solvent in the upper layer of the compartment is collected by the oil float collector 7. The oil outlet of the oil float collector 7 is connected to the suction pump 5 through a hose. The suction pump 5 extracts the oily solvent from the upper layer, making the oil-water separation more thorough. The extracted solvent is stored in the solvent recovery tank 6 for purification and recycling. Example 2

[0036] Based on the above embodiments, in this embodiment, each flow chamber 13 is also provided with multiple baffles 16. The left and right ends of the baffles 16 and the partitions 11 are connected to the pool wall and the partition wall 2. Water and solvent can only flow through the gaps below or overflow from above, causing the sewage to move up and down, increasing the water flow path. During this process, the flow direction and flow potential energy of the water and solvent are also changed, so that the solvent entrained or suspended in the water can be separated more thoroughly, and the overall efficiency of oil-water separation in the pool 10 is significantly improved.

[0037] The top of the pool body 10 is provided with a cover plate 8, which is used to cover the pool body 10. The cover plate 8 is provided with a vent hole 9, which allows the gas inside the pool body 10 to communicate with the outside atmosphere, balance the internal and external air pressure, and prevent solvent odor from leaking out. The cover plate 8 may also be provided with a notch for placing a flexible tube for extracting solvent.

[0038] It should be noted that the detailed structure of some devices in this utility model is not described in detail, but belongs to the prior art known to those skilled in the art, and therefore will not be described again here. In addition, the parts of this device not described are the same as or can be implemented using existing technology.

[0039] It should be noted that those skilled in the art, under the guidance of this utility model, can also make some modifications to the design of the above system. For example, the equipment in the system is also equipped with level gauges, overflow / nitrogen pipelines, etc.; pumps, pressure sensors, flow meters or temperature sensors are installed on the conveying pipelines inside the system in different units or devices, and different valves, such as pressure relief valves, pressure regulating valves, safety valves, pneumatic valves, etc., are also installed to regulate and stabilize the pressure of the entire system, and the opening degree of the valves can also be adjusted to regulate the flow rate of materials in the pipeline, etc.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An apparatus for recovering solvents from wastewater, characterized in that, include: A sewage tank includes a rectangular pool body; multiple partition walls are arranged in an array along the length of the pool body, dividing the pool body into several independent compartments arranged side by side; the leftmost compartment has an inlet pipe on its rear wall, and the rightmost compartment has an outlet pipe on its lower right wall; each compartment has a partition plate inside, the partition plate being perpendicular to the partition wall, the height of the partition plate being less than the height of the pool body, and gaps existing between the top and bottom of the partition plate and the top and bottom of the pool body; the partition plate divides the compartment into... The tank includes an inlet chamber and a flow chamber. Each partition wall is equipped with a connecting pipe for connecting two adjacent compartments. The inlet end of the connecting pipe is located in the flow chamber of the upper compartment, and the outlet end of the connecting pipe is located in the inlet chamber of the lower compartment. The outlet pipe is located in the flow chamber of the rightmost compartment. Each compartment contains at least one oil floater. The oil outlet of each oil floater is connected via a hose to the inlet of a suction pump located outside the tank. The outlet of the suction pump is connected to a solvent recovery tank.

2. The apparatus for recovering solvents from wastewater according to claim 1, characterized in that, The leftmost compartment has a basket grille in its water inlet chamber, and the outlet port of the water inlet pipe is located in the basket grille.

3. The apparatus for recovering solvents from wastewater according to claim 1, characterized in that, Each partition wall is provided with a through hole, and the connecting pipe is installed in the through hole; each connecting pipe is an inverted U-shaped pipe, and the length of the inlet pipe side of the connecting pipe is greater than the length of its outlet pipe side; the distance between the inlet port of each connecting pipe and the bottom of the pool body does not exceed 300mm.

4. The apparatus for recovering solvents from wastewater according to claim 1, characterized in that, The baffle is positioned near the water inlet pipe, such that the length of the flow chamber is greater than the length of the water inlet chamber; the connecting pipes are staggered in the pool body.

5. The apparatus for recovering solvents from wastewater according to claim 1, characterized in that, Each of the flow chambers is further provided with multiple baffles, which are perpendicular to the partition wall and are arranged in an array along the length of the flow chamber; the baffles are arranged to coincide with the central axis of the partition wall.

6. The apparatus for recovering solvents from wastewater according to claim 5, characterized in that, The height of the baffle is greater than the height of the partition and less than the height of the pool body, and there are gaps between the top and bottom of the baffle and the top and bottom of the pool body.

7. The apparatus for recovering solvents from wastewater according to any one of claims 1-6, characterized in that, The top of the pool is provided with a cover plate, which is used to cover the pool; the cover plate is provided with ventilation holes.

8. The apparatus for recovering solvents from wastewater according to claim 7, characterized in that, There are three partition walls, which divide the pool into four independent compartments arranged side by side.

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