Acid wastewater treatment system in biodiesel production process

Abstract

The utility model provides an acid wastewater treatment system in a biodiesel production process, belongs to the technical field of biodiesel, and solves the technical problem that an oil phase adhered to the inner wall of equipment is difficult to remove due to the fact that the structure of the existing equipment is complicated. The device comprises an oil phase treatment mechanism and an acid treatment mechanism. The device is scientific and reasonable in design and convenient to use, oil-phase components in acid water are treated step by step through the first oil-phase treatment box, the second oil-phase treatment box and the third oil-phase treatment box, and the first oil-phase treatment box, the second oil-phase treatment box and the third oil-phase treatment box are simple in structure and low in cost. Oil adhered to the inner walls of the first oil phase treatment box, the second oil phase treatment box and the third oil phase treatment box can be easily removed, so that the influence on subsequent use of the first oil phase treatment box, the second oil phase treatment box and the third oil phase treatment box due to excessive accumulation of the oil is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of biodiesel, and particularly relates to an acidic wastewater treatment system in the production process of biodiesel. Background Art

[0002] The acid water generated in the process of producing biodiesel by using a biodiesel production system mainly contains components such as fatty acids, glycerol, and sulfuric acid. If the acid water is directly discharged into the natural environment, it will pollute the natural water body. The oil-phase components therein will float on the water surface, or be dispersed in the water body, or even dissolve in the water body, which will directly affect the oxygen content of the water body. Therefore, in order to protect the natural environment, the acid water needs to be treated before it can be discharged. Treating the acid water includes removing the oil-phase components therein and treating the sulfuric acid therein.

[0003] The methods for treating acid water mainly include physicochemical methods and biological methods. Among them, the physicochemical methods mainly include membrane separation method, flotation method, flocculation method, adsorption method, coalescence method, etc. The biological methods mainly include activated floc method and biofilm method, etc. When using the flotation method, flocculation method, and membrane separation method to remove the oil-phase components in the acid water, during the process of discharging the oil-phase components from the equipment and the flocculation of the oil phase, the oil-phase components or the flocs formed by the flocculation of the oil phase will adhere to the inner wall of the equipment. Due to the structural complexity of the existing equipment, it is difficult to remove the oil-phase components or flocs adhering to the inner wall of the equipment. Excessive adhesion of the oil-phase components or flocs to the inner wall of the equipment will affect the subsequent use of the equipment and the subsequent acid water treatment effect. Content of the Utility Model

[0004] The technical problem to be solved by the utility model is: to provide an acidic wastewater treatment system in the production process of biodiesel, and solve the technical problem that it is difficult to remove the oil phase adhering to the inner wall of the equipment due to the relatively complex structure of the existing equipment.

[0005] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0006] An acidic wastewater treatment system in the production process of biodiesel includes a first oil-phase treatment tank connected from a biodiesel production system, a second oil-phase treatment tank connected from the first oil-phase treatment tank, a third oil-phase treatment tank connected from the second oil-phase treatment tank, an acid neutralization tank connected from the third oil-phase treatment tank, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank and the third oil-phase treatment tank.

[0007] Further, a tank wall oil scraping mechanism is provided in the first oil-phase treatment tank. The tank wall oil scraping mechanism includes a linear motor A provided on the first oil-phase treatment tank, and an oil removal plate A provided in the first oil-phase treatment tank and connected to the drive shaft of the linear motor A.

[0008] Further, a bubble generating mechanism is also provided in the first oil phase treatment tank. The bubble generating mechanism includes an air pump provided on the first oil phase treatment tank, an air delivery pipe connected to the air pump, and a plurality of bubble output pipes connected to the air delivery pipe and located inside the first oil phase treatment tank.

[0009] Further, a plurality of bubble outlet mechanisms are evenly distributed on the pipe wall of the bubble output pipe. The bubble outlet mechanism includes an air storage cavity provided on the inner wall of the bubble output pipe and communicating with the inner cavity of the bubble output pipe, and a plurality of air delivery pores. One end of the air delivery pore is connected to the air storage cavity, and the other end is located on the outer wall of the bubble output pipe.

[0010] Further, a through hole adapted to the bubble output pipe is formed on the oil removal plate A, and the bubble output pipe is movably inserted into the corresponding through hole.

[0011] Further, an oil removal stirring mechanism and a filtering mechanism are provided in the second oil phase treatment tank;

[0012] The oil removal stirring mechanism includes a driving motor B provided on the second oil phase treatment tank, a first rotating rod connected to the driving shaft of the driving motor B and extending into the second oil phase treatment tank, a plurality of first stirring paddles evenly distributed on the first rotating rod, and a dirt removal plate B provided on the first rotating rod and the first stirring paddle and capable of rotating synchronously with the first rotating rod;

[0013] The filtering mechanism includes a filter membrane provided in the second oil phase treatment tank, a baffle plate movably provided in the second oil phase treatment tank and attached to the filter membrane, and a linear motor C provided on the second oil phase treatment tank and connected to the baffle plate; when the dirt removal plate B rotates, it is respectively attached to the filter membrane and the inner wall of the second oil phase treatment tank.

[0014] Further, an oil removal separation mechanism is provided in the third oil phase treatment tank; the oil removal separation mechanism includes a linear motor D provided on the third oil phase treatment tank, a transmission rod connected to the driving shaft of the linear motor D and located inside the third oil phase treatment tank, and an oil removal plate C provided on the transmission rod and attached to the inner wall of the third oil phase treatment tank; a plurality of installation through holes are evenly distributed on the oil removal plate C, and an oil separation membrane is provided in the installation through holes.

[0015] Further, a stirring mechanism is provided in the acid neutralization tank; the stirring mechanism includes a driving motor E provided on the acid neutralization tank, a second rotating rod provided in the acid neutralization tank and connected to the driving motor E, and a plurality of second stirring paddles evenly distributed on the second rotating rod.

[0016] Further, the oil phase collection mechanism includes a dehumidification tank respectively connected from the first oil phase treatment tank and the third oil phase treatment tank, and a collection tank connected from the dehumidification tank; a plurality of heating and dehumidifying plates are provided in the dehumidification tank, and an oil phase channel is formed between the heating and dehumidifying plates and the inner wall of the dehumidification tank and between adjacent two heating and dehumidifying plates.

[0017] Furthermore, a liquid delivery pipe A is connected between the first oil phase treatment tank and the second oil phase treatment tank, and a liquid delivery pump A is provided on the liquid delivery pipe A. A liquid delivery pipe B is connected between the second oil phase treatment tank and the third oil phase treatment tank, and a liquid delivery pump B is provided on the liquid delivery pipe B. A liquid delivery pipe C is connected between the third oil phase treatment tank and the acid neutralization tank, and a liquid delivery pump C is provided on the liquid delivery pipe C. A liquid delivery pipe D is connected between the third oil phase treatment tank and the oil phase collection mechanism, and a liquid delivery pump D is provided on the liquid delivery pipe D.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model is scientifically and reasonably designed and convenient to use. The utility model uses the first oil phase treatment tank, the second oil phase treatment tank and the third oil phase treatment tank to process the oil phase components in the acid water step by step. The structures of the first oil phase treatment tank, the second oil phase treatment tank and the third oil phase treatment tank are simple, and it is easy to remove the oil adhered to the inner walls of the first oil phase treatment tank, the second oil phase treatment tank and the third oil phase treatment tank, effectively avoiding the excessive accumulation of oil and affecting the subsequent use of the first oil phase treatment tank, the second oil phase treatment tank and the third oil phase treatment tank.

[0020] The first oil phase treatment tank processes the floating oil and dispersed oil in the acid water. In the first oil phase treatment tank, the oil removal plate A is driven by the linear motor A to move up and down in the first oil phase treatment tank, so that the oil adhered to the inner wall of the first oil phase treatment tank can be scraped off, and the oil adhered to the inner wall of the first oil phase treatment tank is convenient to remove; the second oil phase treatment tank processes the emulsified oil in the acid water. The dirt removal plate B is driven by the driving motor B to rotate in the second oil phase treatment tank, so that the oil or flocs adhered to the inner wall of the second oil phase treatment tank can be scraped off, and the oil or flocs adhered to the inner wall of the second oil phase treatment tank are convenient to remove; the third oil phase treatment tank processes the dissolved oil in the acid water. The oil removal plate C is driven by the linear motor D to move from bottom to top in the third oil phase treatment tank, so that the oil adhered to the inner wall of the third oil phase treatment tank can be scraped off, and the oil adhered to the inner wall of the third oil phase treatment tank is convenient to process. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the utility model.

[0022] Figure 2 It is a partial cross-sectional view of the bubble output pipe.

[0023] Figure 3 It is a schematic cross-sectional view of the filter membrane and the baffle on the second oil phase treatment tank.

[0024] Figure 4 It is a top view schematic diagram of the air delivery pipe.

[0025] Figure 5 It is a top view schematic diagram of the oil removal plate A.

[0026] Figure 6 Schematic cross-sectional view of the oil removal plate C

[0027] Figure 7 Schematic top view of the oil removal plate C

[0028] Figure 8 Schematic cross-sectional view of the wall of the first oil phase treatment tank

[0029] Figure 9 Schematic cross-sectional view of the wall of the third oil phase treatment tank

[0030] Among them, the names corresponding to the reference numerals are as follows:

[0031] 1 - First oil phase treatment tank, 2 - Second oil phase treatment tank, 3 - Third oil phase treatment tank, 4 - Acid neutralization tank, 6 - Linear motor A, 7 - Oil removal plate A, 8 - Air pump, 9 - Air delivery pipe, 10 - Bubble output pipe, 11 - Through hole, 21 - Bubble output mechanism, 22 - Air storage cavity, 23 - Fine air delivery hole, 13 - Driving motor B, 14 - First rotating rod, 15 - First stirring paddle, 16 - Dirt removal plate B, 17 - Filter membrane, 18 - Baffle, 19 - Linear motor C, 24 - Linear motor D, 25 - Transmission rod, 26 - Oil removal plate C, 27 - Installation through hole, 28 - Oil separation membrane, 30 - Driving motor E, 31 - Second rotating rod, 32 - Second stirring paddle, 33 - Dehumidification tank, 34 - Collection tank, 35 - Heating and dehumidifying plate, 36 - Oil phase channel, 37 - Liquid delivery pipe A, 38 - Liquid delivery pump A, 39 - Liquid delivery pipe B, 40 - Liquid delivery pump B, 41 - Liquid delivery pipe C, 42 - Liquid delivery pump C, 43 - Liquid delivery pipe D, 44 - Liquid delivery pump D, 45 - Three-way pipe, 46 - First switch, 47 - Second switch, 48 - Ventilation hole, 49 - Drain port, 50 - Brush bristles, 51 - Yielding through hole, 60 - Connecting rod. Detailed implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0033] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] Embodiment 1

[0036] As Figures 1-9 shown, a treatment system for acidic wastewater in the production process of biodiesel provided by the present utility model includes a first oil-phase treatment tank 1 connected from a biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3.

[0037] The design of the present utility model is scientific and reasonable, and it is convenient to use. The present utility model uses the first oil-phase treatment tank, the second oil-phase treatment tank, and the third oil-phase treatment tank to process the oil-phase components in the acid water step by step. The structures of the first oil-phase treatment tank, the second oil-phase treatment tank, and the third oil-phase treatment tank are simple, and it is easy to remove the oil adhered to the inner walls of the first oil-phase treatment tank, the second oil-phase treatment tank, and the third oil-phase treatment tank, effectively avoiding the excessive accumulation of oil and affecting the subsequent use of the first oil-phase treatment tank, the second oil-phase treatment tank, and the third oil-phase treatment tank.

[0038] The first oil phase treatment tank treats the floating oil and dispersed oil in the acid water. Inside the first oil phase treatment tank, the oil removal plate A is driven by the linear motor A to move up and down in the first oil phase treatment tank, so that the oil adhered to the inner wall of the first oil phase treatment tank can be scraped off, and the oil adhered to the inner wall of the first oil phase treatment tank is convenient to remove; the second oil phase treatment tank treats the emulsified oil in the acid water. The dirt removal plate B is driven by the driving motor B to rotate in the second oil phase treatment tank, so that the oil or flocs adhered to the inner wall of the second oil phase treatment tank can be scraped off, and the oil or flocs adhered to the inner wall of the second oil phase treatment tank are convenient to remove; the third oil phase treatment tank treats the dissolved oil in the acid water. The oil removal plate C is driven by the linear motor D to move from bottom to top in the third oil phase treatment tank, so that the oil adhered to the inner wall of the third oil phase treatment tank can be scraped off, and the oil adhered to the inner wall of the third oil phase treatment tank is convenient to treat.

[0039] Embodiment 2

[0040] As Figures 1-9 shown, an acidic wastewater treatment system in the production process of biodiesel provided by the present utility model includes a first oil phase treatment tank 1 connected from a biodiesel production system, a second oil phase treatment tank 2 connected from the first oil phase treatment tank 1, a third oil phase treatment tank 3 connected from the second oil phase treatment tank 2, an acid neutralization tank 4 connected from the third oil phase treatment tank 3, and an oil phase collection mechanism respectively connected from the first oil phase treatment tank 1 and the third oil phase treatment tank 3.

[0041] A tank wall oil scraping mechanism is provided in the first oil phase treatment tank 1. The tank wall oil scraping mechanism includes a linear motor A6 provided on the first oil phase treatment tank 1 and an oil removal plate A7 provided inside the first oil phase treatment tank 1 and connected to the drive shaft of the linear motor A6.

[0042] In this Embodiment 2, a more preferable structure of the first oil phase treatment tank 1 is given. Specifically, a tank wall oil scraping mechanism is provided in the first oil phase treatment tank 1. The tank wall oil scraping mechanism includes a linear motor A6 provided on the first oil phase treatment tank 1 and an oil removal plate A7 provided inside the first oil phase treatment tank 1 and connected to the drive shaft of the linear motor A6.

[0043] The first oil-phase treatment tank 1 is used for statically settling acid water. During the static settling process of the acid water, the bubble output mechanism outputs bubbles, and the bubbles carry the dispersed oil in the acid water to float to the surface of the acid water. When the oil-water stratification in the first oil-phase treatment tank 1 is obvious, the upper and lower stratified oil and water are respectively discharged from the bottom of the first oil-phase treatment tank 1. A three-way pipe 45 is connected to the bottom of the first oil-phase treatment tank 1, and the oil-phase collection mechanism and the second oil-phase treatment tank 2 are respectively connected to the first oil-phase treatment tank 1 through the three-way pipe 45. A first switch 46 and a second switch 47 are provided on the three-way pipe 45. The oil-phase collection mechanism is connected to the first oil-phase treatment tank 1 by opening the first switch 46, and the second oil-phase treatment tank 2 is connected to the first oil-phase treatment tank 1 by opening the second switch 47. The water in the lower layer in the first oil-phase treatment tank 1 flows into the second oil-phase treatment tank 2 through one of the output ends on the three-way pipe 45, so that the second oil-phase treatment tank 2 can continue to further treat the acid water. The oil fraction in the upper layer in the first oil-phase treatment tank 1 flows into the oil-phase collection mechanism through the other output end on the three-way pipe 45.

[0044] After the oil and water in the first oil-phase treatment tank 1 are discharged, the linear motor A drives the oil removal plate A to move from top to bottom in the first oil-phase treatment tank, so as to scrape off the oil fraction adhering to the inner wall of the first oil-phase treatment tank. The oil fraction adhering to the inner wall of the first oil-phase treatment tank is convenient to remove, which is beneficial to the subsequent use of the first oil-phase treatment tank 1.

[0045] Embodiment 3

[0046] As Figures 1-9 shown, an acidic wastewater treatment system in the production process of biodiesel provided by the present utility model includes a first oil-phase treatment tank 1 connected from the biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3.

[0047] A tank wall oil scraping mechanism is provided in the first oil-phase treatment tank 1. The tank wall oil scraping mechanism includes a linear motor A6 provided on the first oil-phase treatment tank 1, and an oil removal plate A7 provided in the first oil-phase treatment tank 1 and connected to the driving shaft of the linear motor A6.

[0048] A bubble generating mechanism is further provided in the first oil-phase treatment tank 1. The bubble generating mechanism includes an air pump 8 provided on the first oil-phase treatment tank 1, an air delivery pipe 9 connected from the air pump 8, and a plurality of bubble output pipes 10 connected from the air delivery pipe 9 and located in the first oil-phase treatment tank 1.

[0049] In Embodiment 3, a more preferable structure of the air-bubbling mechanism is given, specifically: the air-bubbling mechanism includes an air pump 8 provided on the first oil-phase treatment tank 1, an air delivery pipe 9 connected to the air pump 8, and a number of air-bubble output pipes 10 connected to the air delivery pipe 9 and located inside the first oil-phase treatment tank 1.

[0050] The air pump 8 pumps external gas into the first oil-phase treatment tank 15 through the air-bubble output pipes 10, so as to use the air bubbles to carry the dispersed oil in the acid water to float upward. An air vent hole 48 is provided on the first oil-phase treatment tank 15 to facilitate the floating and discharging of the air bubbles.

[0051] Embodiment 4

[0052] As Figures 1-9 shown, an acidic wastewater treatment system provided by the present utility model in the production process of biodiesel includes a first oil-phase treatment tank 1 connected from the biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3.

[0053] A tank wall oil scraping mechanism is provided inside the first oil-phase treatment tank 1. The tank wall oil scraping mechanism includes a linear motor A6 provided on the first oil-phase treatment tank 1, and an oil removal plate A7 provided inside the first oil-phase treatment tank 1 and connected to the driving shaft of the linear motor A6.

[0054] An air-bubbling mechanism is further provided inside the first oil-phase treatment tank 1. The air-bubbling mechanism includes an air pump 8 provided on the first oil-phase treatment tank 1, an air delivery pipe 9 connected to the air pump 8, and a number of air-bubble output pipes 10 connected to the air delivery pipe 9 and located inside the first oil-phase treatment tank 1.

[0055] A number of air-bubble output mechanisms 21 are evenly distributed on the pipe wall of the air-bubble output pipe 10. The air-bubble output mechanism 21 includes an air storage cavity 22 provided on the inner wall of the air-bubble output pipe 10 and communicated with the inner cavity of the air-bubble output pipe 10, and a number of air delivery fine holes 23. One end of the air delivery fine hole 23 is communicated with the air storage cavity 22, and the other end is located on the outer wall of the air-bubble output pipe 10.

[0056] In this Embodiment 4, the gas transported in the air-bubble output pipe 10 is shunted into a number of air storage cavities 22 on the air-bubble output pipe 10. A single air storage cavity 22 corresponds to a plurality of air delivery fine holes 23. In this way, the gas in the air storage cavity 22 flows out into the first oil-phase treatment tank 1 after being shunted through the air delivery fine holes 23 to form a large number of dense air bubbles, which is beneficial to carrying the dispersed oil in the acid water to float upward and improving the floating efficiency of the dispersed oil.

[0057] Embodiment 5

[0058] As Figures 1-9As shown in the figure, a treatment system for acidic wastewater in the production process of biodiesel provided by the present utility model includes a first oil-phase treatment tank 1 connected from a biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3.

[0059] A tank wall oil scraping mechanism is provided in the first oil-phase treatment tank 1. The tank wall oil scraping mechanism includes a linear motor A6 provided on the first oil-phase treatment tank 1, and an oil removal plate A7 provided in the first oil-phase treatment tank 1 and connected to the drive shaft of the linear motor A6.

[0060] An air bubble generating mechanism is further provided in the first oil-phase treatment tank 1. The air bubble generating mechanism includes an air pump 8 provided on the first oil-phase treatment tank 1, an air delivery pipe 9 connected from the air pump 8, and a plurality of bubble output pipes 10 connected from the air delivery pipe 9 and located in the first oil-phase treatment tank 1.

[0061] The oil removal plate A7 is provided with a through hole 11 adapted to the bubble output pipe 10, and the bubble output pipe 10 is movably inserted into the corresponding through hole 11.

[0062] In this embodiment 5, the bubble output pipe 10 is in clearance fit with the through hole 11. The oil removal plate A7 can slide smoothly on the bubble output pipe 10 and scrape off the oil adhered to the outer wall of the bubble output pipe 10 during the sliding process. After the oil and water in the first oil-phase treatment tank 1 are discharged, part of the oil adheres to the outer wall of the bubble output pipe 10. The oil removal plate A7 is movably inserted into the bubble output pipe 10. In this way, when the oil removal plate A7 moves from top to bottom to scrape the oil adhered to the inner wall of the first oil-phase treatment tank 15, it synchronously scrapes the oil adhered to the outer wall of the bubble output pipe 10, which is beneficial to the subsequent use of the bubble output pipe 10. The oil scraped from the inner wall of the first oil-phase treatment tank 15 is discharged through the upper bottom of the first oil-phase treatment tank 15.

[0063] Embodiment 6

[0064] As Figures 1-9 As shown in the figure, a treatment system for acidic wastewater in the production process of biodiesel provided by the present utility model includes a first oil-phase treatment tank 1 connected from a biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism respectively connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3.

[0065] The second oil-phase treatment tank 2 is provided with an oil removal stirring mechanism and a filtering mechanism;

[0066] The oil removal stirring mechanism includes a driving motor B13 provided on the second oil phase treatment tank 2, a first rotating rod 14 connected to the driving shaft of the driving motor B13 and extending into the second oil phase treatment tank 2, a plurality of first stirring paddles 15 evenly distributed on the first rotating rod 14, and a dirt removal plate B16 provided on the first rotating rod 14 and the first stirring paddles 15 and capable of rotating synchronously with the first rotating rod 14;

[0067] The filtering mechanism includes a filter membrane 17 provided in the second oil phase treatment tank 2, a baffle 18 movably provided in the second oil phase treatment tank 2 and attached to the filter membrane 17, and a linear motor C19 provided on the second oil phase treatment tank 2 and connected to the baffle 18; when the dirt removal plate B16 rotates, it is respectively attached to the filter membrane 17 and the inner wall of the second oil phase treatment tank 2.

[0068] In this Embodiment 6, the second oil phase treatment tank 2 is used to treat the emulsified oil in the acid water. A flocculant is added into the second oil phase treatment tank 2, and the oil removal stirring mechanism is used to fully mix the flocculant with the acid water, so that the oil particles in the acid water flocculate into larger flocs. The filtering mechanism is used to separate the flocs from the acid water.

[0069] The dirt removal plate B16 is provided with bristles 50. While the oil removal stirring mechanism stirs the flocculant and the acid water, the dirt removal plate B16 on it synchronously scrapes the oil phase and flocs adhered to the inner wall of the second oil phase treatment tank 2, preventing excessive accumulation of the oil phase and flocs on the inner wall of the second oil phase treatment tank 2 and affecting subsequent use. During the rotation of the dirt removal plate B16, the bristles 50 on it synchronously brush the flocs attached to the filter membrane 17 to avoid clogging of the filter membrane 17. A connecting rod 60 is provided at the top of the baffle 18, and the connecting rod 60 is connected to the telescopic shaft of the linear motor C19.

[0070] During the stirring process of the first stirring paddle 15 in the second oil phase treatment tank 2, the baffle 18 is attached to the filter membrane 17 to prevent the acid water in the second oil phase treatment tank 2 from passing through the filter membrane 17 before being fully flocculated, thus affecting the removal effect of the emulsified oil in the acid water. After the flocculant and the acid water in the second oil phase treatment tank 2 are fully mixed and no flocs are formed, the linear motor C19 drives the baffle 18 to move. The linear motor C19 drives the baffle 18 to lift upward in the second oil phase treatment tank 2, and the baffle 18 cancels the shielding of the acid water, so that the acid water can pass through the filter membrane 17, and the filter membrane 17 filters the flocs in the acid water. The filtered flocs are discharged from the sewage outlet 49 provided at the bottom of the second oil phase treatment tank 2.

[0071] When the baffle 18 needs to be fitted with the filter membrane 17, the linear motor C19 is used to drive the baffle 18 downward and insert the baffle 18 into the slot on the inner bottom surface of the second oil phase treatment tank 2. At this time, the baffle 18 divides the inner cavity of the second oil phase treatment tank 2 into two non-communicating chambers. When the baffle 18 needs to be removed to block the acid water, the linear motor C19 is used to drive the baffle 18 upward. At this time, the two chambers in the inner cavity of the second oil phase treatment tank 2 are connected through the gap between the bottom end of the baffle 18 and the inner bottom surface of the second oil phase treatment tank 2. The maximum of this gap can reach one-tenth of the elevation of the inner cavity of the second oil phase treatment tank 2, and the acid water passes through the filter membrane 17 through this gap.

[0072] The driving motor B13 is a forward and reverse servo motor.

[0073] Embodiment 7

[0074] As Figures 1-9 As shown in the figure, a system for treating acidic wastewater in the production process of biodiesel provided by the present utility model includes a first oil phase treatment tank 1 connected from the biodiesel production system, a second oil phase treatment tank 2 connected from the first oil phase treatment tank 1, a third oil phase treatment tank 3 connected from the second oil phase treatment tank 2, an acid neutralization tank 4 connected from the third oil phase treatment tank 3, and an oil phase collection mechanism respectively connected from the first oil phase treatment tank 1 and the third oil phase treatment tank 3.

[0075] An oil removal and separation mechanism is provided in the third oil phase treatment tank 3; the oil removal and separation mechanism includes a linear motor D24 provided on the third oil phase treatment tank 3, a transmission rod 25 connected to the driving shaft of the linear motor D24 and located in the third oil phase treatment tank 3, and an oil removal plate C26 provided on the transmission rod 25 and fitting with the inner wall of the third oil phase treatment tank 3; a plurality of installation through holes 27 are evenly distributed on the oil removal plate C26, and an oil separation membrane 28 is provided in the installation through holes 27.

[0076] In this Embodiment 7, the oil separation membrane 28 is used to separate the dissolved oil in the acid water. In the third oil phase treatment tank 3, the acid water permeates through the oil separation membrane 28, while the dissolved oil remains above the oil separation membrane 28. After the dissolved oil is separated from the acid water, the dissolved oil is discharged from the top end of the third oil phase treatment tank 3, and the acid water is discharged from the bottom end of the third oil phase treatment tank 3. The part of the dissolved oil adhering to the third oil phase treatment tank 3 during the discharge process is scraped and collected from bottom to top in the third oil phase treatment tank 3 by the oil removal plate C26, and then discharged from the top end of the third oil phase treatment tank 3.

[0077] Embodiment 8

[0078] As Figures 1-9As shown, the utility model provides an acidic wastewater treatment system in a biodiesel production process, comprising a first oil phase treatment tank 1 connected from the biodiesel production system, a second oil phase treatment tank 2 connected from the first oil phase treatment tank 1, a third oil phase treatment tank 3 connected from the second oil phase treatment tank 2, an acid neutralization tank 4 connected from the third oil phase treatment tank 3, and oil phase collecting mechanisms respectively connected from the first oil phase treatment tank 1 and the third oil phase treatment tank 3.

[0079] A stirring mechanism is provided in the acid neutralization box 4 ; the stirring mechanism comprises a driving motor E30 provided on the acid neutralization box 4 , a second rotating rod 31 provided in the acid neutralization box 4 and connected to the driving motor E30 , and a plurality of second stirring paddles 32 evenly distributed on the second rotating rod 31 .

[0080] In this embodiment 8, adding alkaline solution into the acid neutralization box 4 can reduce the acidity of the acid water until the acid water becomes neutral, and the neutral water is discharged through the bottom of the acid neutralization box 4. The driving motor E30 is a forward and reverse servo motor.

[0081] Example 9

[0082] like Figures 1-9 As shown, the utility model provides an acidic wastewater treatment system in a biodiesel production process, comprising a first oil phase treatment tank 1 connected from the biodiesel production system, a second oil phase treatment tank 2 connected from the first oil phase treatment tank 1, a third oil phase treatment tank 3 connected from the second oil phase treatment tank 2, an acid neutralization tank 4 connected from the third oil phase treatment tank 3, and oil phase collecting mechanisms respectively connected from the first oil phase treatment tank 1 and the third oil phase treatment tank 3.

[0083] The oil phase collecting mechanism includes a dehumidification box 33 connected from the first oil phase treatment box 1 and the third oil phase treatment box 3 respectively, and a collecting box 34 connected from the dehumidification box 33; a plurality of heating dehumidification plates 35 are arranged in the dehumidification box 33, and oil phase channels 36 are formed between the heating dehumidification plates 35 and the inner wall of the dehumidification box 33, and between two adjacent heating dehumidification plates 35.

[0084] In this embodiment 9, the dehumidification box 33 is used to dehumidify the oil, which is convenient for oil recovery. The heating dehumidification plate 35 and the inner wall of the dehumidification box 33, as well as the two adjacent heating dehumidification plates 35, are provided with oil phase channels 36, which prolong the time that the oil stays in the dehumidification box 33 and improve the oil dehumidification effect. The edge of the heating dehumidification plate 35 is sealed with the inner wall of the dehumidification box 33, and the heating dehumidification plate 35 is provided with a clearance through hole 51 connected to the oil phase channel 36, and the oil flows from the upper heating dehumidification plate 35 to the next heating dehumidification plate 35 through the clearance through hole 51.

[0085] Example 10

[0086] like Figures 1-9As shown in the figure, a treatment system for acidic wastewater in the production process of biodiesel provided by the present utility model includes a first oil-phase treatment tank 1 connected from a biodiesel production system, a second oil-phase treatment tank 2 connected from the first oil-phase treatment tank 1, a third oil-phase treatment tank 3 connected from the second oil-phase treatment tank 2, an acid neutralization tank 4 connected from the third oil-phase treatment tank 3, and an oil-phase collection mechanism connected from the first oil-phase treatment tank 1 and the third oil-phase treatment tank 3 respectively.

[0087] A liquid delivery pipe A37 is connected between the first oil-phase treatment tank 1 and the second oil-phase treatment tank 2, and a liquid delivery pump A38 is provided on the liquid delivery pipe A37. A liquid delivery pipe B39 is connected between the second oil-phase treatment tank 2 and the third oil-phase treatment tank 3, and a liquid delivery pump B40 is provided on the liquid delivery pipe B39. A liquid delivery pipe C41 is connected between the third oil-phase treatment tank 3 and the acid neutralization tank 4, and a liquid delivery pump C42 is provided on the liquid delivery pipe C41. A liquid delivery pipe D43 is connected between the third oil-phase treatment tank 3 and the oil-phase collection mechanism, and a liquid delivery pump D44 is provided on the liquid delivery pipe D43.

[0088] The linear motor A6, air pump 8, drive motor B13, linear motor C19, linear motor D24, drive motor E30, liquid delivery pump A38, liquid delivery pump B40, liquid delivery pump C42 and liquid delivery pump D44 used in the present utility model are all existing known electrical equipment and can be directly purchased and used in the market. The structures, circuits, and control principles of the linear motor A6, air pump 8, drive motor B13, linear motor C19, linear motor D24, drive motor E30, liquid delivery pump A38, liquid delivery pump B40, liquid delivery pump C42 and liquid delivery pump D44 are all existing known technologies. Therefore, the structures, circuits, and control principles of the linear motor A6, air pump 8, drive motor B13, linear motor C19, linear motor D24, drive motor E30, liquid delivery pump A38, liquid delivery pump B40, liquid delivery pump C42 and liquid delivery pump D44 will not be elaborated here.

[0089] Finally, it should be noted that the above embodiments are only the preferred embodiments of the present utility model to illustrate the technical solutions of the present utility model, rather than limiting it, and certainly not limiting the patent scope of the present utility model; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present utility model; that is to say, any meaningless changes or polishing made in the main design concept and spirit of the present utility model, as long as the technical problems solved are still the same as those of the present utility model, should be included in the protection scope of the present utility model; in addition, directly or indirectly applying the technical solutions of the present utility model to other related technical fields shall similarly be included in the patent protection scope of the present utility model.

Claims

1. A system for treating acidic wastewater in a biodiesel production process, characterized in that: It comprises a first oil phase processing tank (1) connected to a biodiesel production system, a second oil phase processing tank (2) connected to the first oil phase processing tank (1), a third oil phase processing tank (3) connected to the second oil phase processing tank (2), an acid neutralization tank (4) connected to the third oil phase processing tank (3), and oil phase collection mechanisms respectively connected to the first oil phase processing tank (1) and the third oil phase processing tank (3); The first oil phase treatment box (1) is provided with a box wall oil scraping mechanism, the box wall oil scraping mechanism comprising a linear motor A (6) arranged on the first oil phase treatment box (1), and an oil removal plate A (7) arranged in the first oil phase treatment box (1) and connected to the driving shaft of the linear motor A (6); A bubble generating mechanism is also provided in the first oil phase processing box (1), the bubble generating mechanism comprising an air pump (8) provided on the first oil phase processing box (1), an air delivery pipe (9) connected from the air pump (8), and a plurality of bubble output pipes (10) connected from the air delivery pipe (9) and located in the first oil phase processing box (1); The second oil phase treatment box (2) is provided with an oil removal stirring mechanism and a filtering mechanism; The oil removal and stirring mechanism comprises a driving motor B (13) disposed on the second oil phase treatment box (2), a first rotating rod (14) connected to a driving shaft of the driving motor B (13) and extending into the second oil phase treatment box (2), a plurality of first stirring paddles (15) evenly distributed on the first rotating rod (14), and a decontamination plate B (16) disposed on the first rotating rod (14) and the first stirring paddle (15) and capable of rotating synchronously with the first rotating rod (14); The filtering mechanism comprises a filtering membrane (17) disposed in the second oil phase processing box (2), a baffle (18) movably disposed in the second oil phase processing box (2) and in contact with the filtering membrane (17), and a linear motor C (19) disposed on the second oil phase processing box (2) and connected to the baffle (18); when the decontamination plate B (16) rotates, it is in contact with the filtering membrane (17) and the inner wall of the second oil phase processing box (2) respectively; An oil removal and separation mechanism is provided in the third oil phase treatment box (3); the oil removal and separation mechanism comprises a linear motor D (24) provided on the third oil phase treatment box (3), a transmission rod (25) connected to a drive shaft of the linear motor D (24) and located in the third oil phase treatment box (3), and an oil removal plate C (26) provided on the transmission rod (25) and in contact with the inner wall of the third oil phase treatment box (3); a plurality of mounting through holes (27) are evenly distributed on the oil removal plate C (26), and an oil separation membrane (28) is provided in the mounting through hole (27).

2. The system for treating acidic wastewater in a biodiesel production process according to claim 1, characterized in that: A plurality of bubble outlet mechanisms (21) are evenly distributed on the wall of the bubble output tube (10). The bubble outlet mechanism (21) comprises an air containing cavity (22) disposed on the inner wall of the bubble output tube (10) and connected to the inner cavity of the bubble output tube (10), and a plurality of air delivery holes (23). One end of the air delivery hole (23) is connected to the air containing cavity (22), and the other end is located on the outer wall of the bubble output tube (10).

3. The system for treating acidic wastewater in a biodiesel production process according to claim 1, characterized in that: The degreasing plate A (7) is provided with a through hole (11) adapted to the bubble output pipe (10), and the bubble output pipe (10) is movably inserted into the corresponding through hole (11).

4. The system for treating acidic wastewater in a biodiesel production process according to claim 1, characterized in that: A stirring mechanism is provided in the acid neutralization box (4); the stirring mechanism comprises a driving motor E (30) provided on the acid neutralization box (4), a second rotating rod (31) provided in the acid neutralization box (4) and connected to the driving motor E (30), and a plurality of second stirring paddles (32) evenly distributed on the second rotating rod (31).

5. The system for treating acidic wastewater in a biodiesel production process according to claim 1, characterized in that: The oil phase collecting mechanism comprises a dehumidification box (33) connected to the first oil phase processing box (1) and the third oil phase processing box (3), and a collecting box (34) connected to the dehumidification box (33); a plurality of heating dehumidification plates (35) are arranged in the dehumidification box (33); oil phase channels (36) are formed between the heating dehumidification plates (35) and the inner wall of the dehumidification box (33), and between two adjacent heating dehumidification plates (35).

6. The system for treating acidic wastewater in a biodiesel production process according to claim 1, characterized in that: A liquid infusion pipe A (37) is connected between the first oil phase treatment box (1) and the second oil phase treatment box (2), and a liquid infusion pump A (38) is provided on the liquid infusion pipe A (37); a liquid infusion pipe B (39) is connected between the second oil phase treatment box (2) and the third oil phase treatment box (3), and a liquid infusion pump B (40) is provided on the liquid infusion pipe B (39); a liquid infusion pipe C (41) is connected between the third oil phase treatment box (3) and the acid neutralization box (4), and a liquid infusion pump C (42) is provided on the liquid infusion pipe C (41); and a liquid infusion pipe D (43) is connected between the third oil phase treatment box (3) and the oil phase collection mechanism, and a liquid infusion pump D (44) is provided on the liquid infusion pipe D (43).

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