A system and process for treating pharmaceutical wastewater containing antibiotics

Abstract

The present invention provides a system and process for treating pharmaceutical wastewater containing antibiotics in the field of wastewater cleaning technology. The pharmaceutical wastewater containing antibiotics treatment system includes a flotation treatment system, which includes: a flotation tank; a first treatment part, which is used to mix flocculants, coagulants and wastewater and is arranged on one side of the flotation tank; and a third treatment part, which is used to salvage and separate the flocs floated out after treatment and is arranged on the other side of the flotation tank; characterized in that it also includes: a second treatment part, which is used to make the suspended flocs float to the wastewater surface and is arranged between the first treatment part and the third treatment part; the second treatment part includes: a flotation chamber. The present invention has the advantages of high separation efficiency and good separation effect of waste residue flocs and suspended matter during flotation treatment of pharmaceutical wastewater containing antibiotics.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater cleaning, and in particular to a system and process for treating pharmaceutical wastewater containing antibiotics. Background Art

[0002] Synthetic wastewater and wastewater from fermentation products have the characteristics of high load, poor degradability, and high biological toxicity. Direct entry can easily cause impact on the biochemical system. Therefore, various types of wastewater need to be pretreated. During the pretreatment process, the pharmaceutical wastewater needs to be subjected to wastewater degradation, full-pressure flotation filtration of drug residues, fluidized bed Fenton, anaerobic treatment, and aerobic treatment; in the full-pressure flotation treatment process, due to the high concentration of pharmaceutical and chemical wastewater, and the use of lime precipitation, diatomaceous earth and activated carbon adsorption in the production process, the fermentation liquid will also produce a large amount of scum due to hydrolysis, so the content of suspended matter is large, and cavitation flotation treatment technology is often used for treatment.

[0003] Chinese patent CN209940626U discloses an air flotation machine for effectively removing light floating flocs in wastewater, including an air flotation machine body and a filter assembly, wherein a first cavity is arranged on the right side inside the air flotation machine body, and a second cavity is arranged on the left side inside the air flotation machine body, legs are fixedly connected to the left and right sides of the bottom surface of the air flotation machine body, and a mounting top plate is installed on the top surface of the air flotation machine body, a first rotating shaft is installed inside the second cavity, and a crushing rod is welded to the outer wall of the first rotating shaft by winding, and the filter assembly is installed above the inside of the second cavity.

[0004] However, although this technical solution can solve the problem of floc clumping and clogging, the flocs formed when the flocculants and coagulants react with the waste residues in the wastewater will contain a certain amount of water. As a result, during the flotation treatment, the efficiency of the flocs floating to the liquid surface is low. In addition, a large number of flocs that have not floated are likely to remain in the water and be directly discharged, causing pollution. Summary of the invention

[0005] The purpose of the present invention is to provide an antibiotic-containing pharmaceutical wastewater treatment system in view of the deficiencies of the prior art. After the flocculant, the coagulant aid and the wastewater are fully flocculated by the first treatment part, the flocculant, the coagulant aid and the wastewater are introduced from the bottom of the flotation chamber, and the gas is introduced through the ventilation component to form microbubbles adsorbed on the surface of the flocs and rise to the extrusion component. The pulling component moves synchronously with the extrusion belt body and involves the flotation channel to elastically open and enter the floating gas. Subsequently, the pulling component releases the extrusion belt body, and the flotation channel elastically squeezes the flocs to discharge moisture. The flocs on the extrusion belt body that have not been squeezed are hung into the flotation channel through the scraping belt component. When passing through the pulling component again, the flotation channel is elastically opened and squeezed again. The scum floating to the liquid surface is salvaged by the third treatment part, and the flushing component performs hydrodynamic flushing on the oblique S-shaped flotation belt body that reaches the top to separate the flocs. The flushed flotation belt body moves to the next squeezing cycle to solve the technical problem that the flocs contain moisture and affect the floating formation of complex efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A system for treating pharmaceutical wastewater containing antibiotics comprises a flotation treatment system, the flotation treatment system comprising: a flotation tank; a first treatment section, the first treatment section for mixing flocculants, coagulants and wastewater is arranged on one side of the flotation tank; and a third treatment section, the third treatment section for salvaging and separating flocs floated out after treatment is arranged on the other side of the flotation tank; it is characterized in that it also comprises: a second treatment section, the second treatment section for making suspended flocs float to the surface of the wastewater is arranged between the first treatment section and the third treatment section; the second treatment section comprises: a flotation chamber; an extrusion assembly, the extrusion assembly for squeezing and squeezing out the water in the flocs is arranged from bottom to top in the flotation chamber; and a ventilation assembly, the ventilation assembly for introducing gas constituting microbubbles is installed below the floc squeezing of the extrusion assembly.

[0008] Furthermore, the squeezing assembly includes: a squeezing belt assembly, which is arranged layer by layer in the flotation chamber for draining water when the flocs with microbubbles attached to the surface float up through a reciprocating squeezing action; and a scraping belt assembly, which is arranged on one side of the squeezing belt assembly for scraping the flocs that are not squeezed on the squeezing belt assembly to the squeezing area.

[0009] Furthermore, the extrusion belt assembly includes: an extrusion belt, which is penetrated by a plurality of groups of extrusion channels and arranged in a closed loop; a pulling assembly, which follows the continuously moving extrusion belt and pulls the extrusion channels to elastically open, and is arranged on the upper and lower sides of each layer of the extrusion belt; and a flushing assembly, which pushes water to flush the extrusion belt located at the top of the flotation chamber to one side, and is installed on the inner wall of the flotation chamber.

[0010] Furthermore, the extrusion belt member includes: an air-floating belt body; an air-floating roller member, wherein the air-floating roller member is arranged on one side of the bottom of the air-floating chamber so that the air-floating belt body is arranged in a vertical S shape; and a flushing roller member, wherein the flushing roller member is arranged on one side of the top of the air-floating roller member so that the air-floating belt body is arranged in an S shape in the horizontal direction and corresponds to the flushing assembly.

[0011] Furthermore, the flushing roller is arranged obliquely along the width direction of the air-floating belt body, so that the air-floating belt body and the flushing direction of the flushing assembly are arranged at an angle α.

[0012] Furthermore, the pulling component includes: a pulling component, which is slidably arranged on the inner wall of the air flotation chamber and intermittently rolls to contact and pull the extrusion belt to open the extrusion channel; and a transfer component, which is installed on the inner wall of the air flotation chamber so that the pulling component in contact with the extrusion belt moves synchronously with the extrusion belt and makes the pulling component that leaves the extrusion belt return.

[0013] Furthermore, the pulling assembly includes: a sliding frame; a pulling roller installed on the sliding frame along the width direction of the extruded belt; and a pulling power member installed on the sliding frame for driving the pulling roller to rotate; a notch is provided on the surface of the pulling roller for rotating away from the surface of the extruded belt.

[0014] Furthermore, the transfer assembly includes: a transfer roller rotatably installed in the air flotation chamber; a transfer channel symmetrically spirally connected and opened on the surface of the transfer roller; and a guide member with one end installed on the sliding frame and the other end inserted in the transfer channel.

[0015] Furthermore, the scraper belt assembly includes: a scraper installed on the inner wall of the flotation chamber and obliquely pressed against the surface of the extrusion belt assembly; a pad arranged on the other side of the extrusion belt assembly and corresponding to the scraper; and a pushing assembly arranged on one side of the bottom of the scraper to push the scraped material at the bottom of the scraper to the extrusion belt assembly.

[0016] In view of the above shortcomings, the present invention also provides a process for separating flocs in a system for treating antibiotic-containing pharmaceutical wastewater, which is characterized by comprising the following steps:

[0017] Step 1: ventilation, adding flocculant PAC and coagulant aid PAM into the wastewater in the first treatment part, and after flocculation reaction, passing the flocculated wastewater from the bottom of the air flotation chamber to the bottom of the extrusion assembly to be squeezed;

[0018] Step 2: Microbubble adsorption: gas is introduced into the ventilation component, and the gas forms microbubbles under the pinching area of ​​each layer of the extrusion belt. Then the microbubbles are adsorbed on the surface of the flocs, so that the flocs in the suspended state continue to rise under the action of the buoyancy of the bubbles.

[0019] Step 3: floc extrusion. When the flocs with attached microbubbles reach the extrusion belt, the pulling component pulls the extrusion belt to elastically open the extrusion channel on the extrusion belt. Then, in the open state, the flocs that continue to rise enter the extrusion channel. Then, the pulling component releases the extrusion belt, and the extrusion channel rebounds and squeezes the flocs to squeeze out the water in the flocs. When the pulling component opens the extrusion channel again, the extruded flocs rise rapidly due to the buoyancy.

[0020] Step 4: releasing the flocs. In step 3, when the pulling assembly is in action, the pulling roller rotates and contacts the surface of the extrusion belt, and pulls along the conveying direction and the reverse direction of the extrusion belt, so that the extrusion channel is opened, and when the pulling roller continues to rotate, the notch corresponds to the extrusion belt. At this time, the extrusion belt is in a loose state, the extrusion channel shrinks, and the flocs are elastically squeezed;

[0021] Step 5: scraping the belt surface. The scraper is set on the side of the S-shaped air-floating belt body during the conveying process. As the extrusion belt assembly moves, the belt surface is scraped. The pushing assembly reciprocates to push the scraped flocs toward one side and push them into the extrusion channel opened by the pushing block for extrusion.

[0022] Step 6: flushing the belt surface. The continuously transported air-floating belt body is transferred to the flushing roller. The flushing assembly flushes the surface of the air-floating belt body after being arranged by the flushing roller arranged obliquely in the width direction of the air-floating belt body, so that the impact water passes through the extrusion channel on the surface of the air-floating belt body, and cleans the two sides of the air-floating belt body respectively.

[0023] Step seven, floc separation, the flocs after flotation treatment rise to the top of the liquid surface and are salvaged through the third treatment section.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention cooperates with the extrusion component and the ventilation component. After the wastewater after the flocculation reaction is introduced into the flotation chamber, the extrusion component squeezes the flocs layer by layer along the flotation direction of the flocs to squeeze out the water in the flocs, thereby accelerating the flotation speed of the flocs combined with microbubbles after dehydration, thereby solving the technical problem that the flotation efficiency is affected by the water in the flocs.

[0026] (2) The present invention adopts the mutual cooperation between the squeezing belt assembly and the scraping belt assembly, and the structural design of the S-shaped vertically arranged flotation belt body. When the squeezing belt assembly squeezes the flotation, the flotation that has not passed through the flotation channel will be scraped by the scraping belt assembly into the flotation channels on both sides of the S-shaped moving flotation belt body, so as to achieve the re-squeezing and drainage of the squeezing belt assembly during continuous transportation, thereby solving the technical problems of flotation channel blockage and incomplete flotation treatment caused by flotation accumulation on the flotation belt body.

[0027] (3) The present invention realizes the synchronous pulling of both sides of the extruded belt by the mutual cooperation between the extruded belt and the pulling assembly. When the pulling assembly pulls the extruded belt, the pulling assembly moves along with the extruded belt. When the pulling assembly withdraws from the extruded belt, the pulling assembly returns to the original position. The cycle continues.

[0028] (4) The present invention cooperates with the scouring roller, the air flotation belt and the scouring assembly. The scouring roller arranges the air flotation belt into a transverse S shape and is arranged obliquely along the width direction of the belt surface. When the scouring assembly provides water flow power along the width direction of the belt surface, the water flow power obliquely passes through the air flotation channel to quickly flush away the flocs adsorbed on the belt surface, so as to maintain a clean state and enter the next squeezing cycle.

[0029] In summary, the present invention has the advantages of high separation efficiency and good separation effect for waste residue floccules and suspended matter during flotation treatment of antibiotic-containing pharmaceutical wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 A cross-sectional view of

[0032] Figure 3 is a cross-sectional view of the air flotation chamber of the present invention;

[0033] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0034] Figure 5 For the present invention Figure 3 Schematic diagram of the structure from another perspective;

[0035] Figure 6 It is a schematic diagram of the structure of the extruded strip of the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the pulling assembly of the present invention;

[0037] Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle;

[0038] Fig. 9 It is a structural schematic diagram of the scraper belt assembly of the present invention;

[0039] Fig.10 It is a structural schematic diagram of the pushing assembly of the present invention;

[0040] Fig.11 It is a schematic diagram of the state of the pulling process of the extruded belt of the present invention;

[0041] Fig.12 The figure is a flow chart of the processing process of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] Embodiment 1

[0045] like Figure 1As shown, a system for treating pharmaceutical wastewater containing antibiotics includes a flotation treatment system, the flotation treatment system includes: a flotation tank 1; a first treatment part 2, the first treatment part 2 for mixing flocculants, coagulants and wastewater is arranged on one side of the flotation tank 1; and a third treatment part 3, the third treatment part 3 for salvaging and separating flocs floated out after treatment is arranged on the other side of the flotation tank 1; also includes: a second treatment part 4, the second treatment part 4 for making the suspended flocs float to the wastewater surface is arranged between the first treatment part 2 and the third treatment part 3; the second treatment part 4 includes: a flotation chamber 41; an extrusion component 42, the extrusion component 42 for squeezing and squeezing out the water in the flocs is arranged from bottom to top in the flotation chamber 41; and a ventilation component 43, the ventilation component 43 for introducing gas constituting microbubbles is installed below the floc squeezing of the extrusion component 42.

[0046] It is not difficult to find from the above content that in the process of treating pharmaceutical wastewater containing antibiotics, in order to better realize the recovery and treatment of the drug residue suspended in the wastewater, the wastewater is discharged into the first treatment part 2 on one side of the flotation tank 1. The first treatment part 2 is a flocculation reaction tank between the flocculant PAC, the coagulant aid PAM and the wastewater. After the flocculation reaction is completed, the flocculation reaction wastewater is preferably introduced from the bottom side of the second treatment part 2, so that the flocs will be in the flotation chamber 41. After the gas is introduced into the ventilation component 43, the surface of the flocs adsorbs microbubbles and has an upward buoyancy. At the same time, in order to better improve the floating efficiency and floating effect of the flocs, above the ventilation of the ventilation component 43, the extrusion component 42 is used to reciprocate and squeeze the flocs along the rising direction of the flocs, so as to squeeze out the water in the flocs, so that the dehydrated flocs can improve the floating efficiency in the water while combining with microbubbles; and when the microbubbles float to the liquid surface of the flotation chamber 41, the third treatment part 3 will push the scum to one side for salvage.

[0047] like Figure 2 As shown, the third processing part 3 includes a separation tank 31, an annular conveying chain 32 arranged on both sides of the top of the separation tank 31, and a scum scraper member 33 installed on the annular conveying chain 32; the scum scraper member 33 is driven to rotate by the moving power of the annular conveying chain 32, and when the scum scraper member 33 contacts the liquid surface, the scum on the liquid surface is pushed to one side for cleaning.

[0048] like Figure 7 As shown, the ventilation component 43 includes a pipe bracket 431 and air outlets 432 evenly distributed on the pipe bracket 431; the pipe bracket 431 is a bracket-shaped pipe structure with a hollow cavity.

[0049] like Figure 3As shown, the squeezing component 42 includes: a squeezing belt component 421, which is arranged layer by layer in the flotation chamber 41 for draining water when the flocs with microbubbles attached to the surface float through a reciprocating squeezing action; and a scraping belt component 422, which is arranged on one side of the squeezing belt component 421 for scraping the flocs that are not squeezed on the squeezing belt component 421 to the squeezing area.

[0050] In this embodiment, during the squeezing process of the flocs, the squeezing component 42 uses the squeezing belt component 421 to perform reciprocating squeezing and drainage treatment on the continuously rising flocs. During the rising process, the flocs blocked and adsorbed by the squeezing component 42 will be scraped by the hanging belt component 422 into the squeezing area for squeezing and drainage treatment, and then continue to float to the liquid surface due to the buoyancy.

[0051] like Figure 4 As shown, the extrusion belt assembly 421 includes: an extrusion belt 4211, wherein the extrusion belt 4211 is penetrated by a plurality of groups of extrusion channels 42111 and is arranged in a closed loop; a pulling assembly 4212, wherein the pulling assembly 4212 is arranged on the upper and lower sides of each layer of the extrusion belt 4211 and follows the continuously moving extrusion belt 4211 to pull the extrusion channels 42111 to elastically open; and a flushing assembly 4213, wherein the flushing assembly 4213 is installed on the inner wall of the air flotation chamber 41 and pushes water to flush the extrusion belt 4211 located at the top of the air flotation chamber 41 to one side.

[0052] In this embodiment, during the process of squeezing the flocs, the extrusion belt assembly 421 continuously pulls the extrusion belt 4211 to both sides by using the pulling assembly 4212, so that the extrusion channel 42111 is elastically opened. When opening, when the floating flocs pass by, the pulling assembly 4212 loosens the extrusion belt 4211, and the extrusion channel 42111 elastically contracts, and the flocs in the extrusion channel 42111 are squeezed during the contraction, thereby achieving extrusion and drainage treatment of the flocs, and when the extrusion belt 4211 continues to rise to the top, the flushing assembly 4212 uses water power to flush the extrusion belt 4211, and while cleaning the circulating extrusion belt 4211, it can also further improve the pushing of the wastewater liquid surface scum to the third treatment part 3.

[0053] like Figure 3 As shown, the flushing assembly 4213 includes a plurality of pump bodies sequentially arranged along the conveying direction of the top extrusion belt 4211 , through which separated water below the scum separation of the third treatment part 3 is pumped to flush the extrusion belt 4211 .

[0054] like Figure 6As shown, the extrusion belt 4211 includes: an air-floating belt body 42112; an air-floating roller 42113, wherein the air-floating roller 42113 is arranged on one side of the bottom of the air-floating chamber 41 so that the air-floating belt body 42112 is arranged in a vertical S shape; and a flushing roller 42114, wherein the air-floating belt body 42112 on one side of the top of the air-floating roller 42113 is arranged in an S shape in the horizontal direction and the flushing roller 42114 is arranged corresponding to the flushing assembly 4213.

[0055] In this embodiment, by utilizing the S-shaped arrangement of the flotation roller 42113 of the flotation belt 42112, the flotation belt 42112 can be arranged as a multi-layer structure for sustainable transportation, thereby improving the effective squeezing of the flocs, and can also facilitate the scraping belt assembly 422 to scrape the un-extruded flocs into the extrusion channel 42111 when the flotation belt 42112 passes through the two sides of the S shape, so that when the flotation belt 42112 reaches the pulling area of ​​the pulling assembly 4212 again, the flocs can be squeezed again to achieve drainage of the flocs.

[0056] like Figure 6 As shown, the flushing roller 42114 is arranged obliquely along the width direction of the air-floating belt body 42112 , so that the air-floating belt body 42112 and the flushing direction of the flushing assembly 4213 are arranged at an angle α.

[0057] In this embodiment, by arranging the air-floating belt body 42112 and the flushing direction of the flushing assembly 4213 at the angle α, the flowing water can be inclined through the air-floating belt body 42112, thereby realizing the inclined flushing treatment of the air-floating belt body 42112 during the circulation process, thereby improving the cleaning effect of the air-floating belt body 42112.

[0058] It should also be added that a baffle 411 is provided on one side of the flotation chamber 41. The flotation belt 42112 that passes over the flushing roller 42114 passes through the baffle 411 via the guide roller 412, and passes through the bottom side of the baffle 411 to connect with the flotation belt 42112 on the side below the flotation roller 42113.

[0059] A driving roller 413 for driving the air-floating belt 42112 to move is correspondingly provided on one side of the air-floating belt 42112 away from the guide roller 412 , and the driving roller 413 is driven by the power of a servo motor.

[0060] like Figure 7As shown, the pulling component 4212 includes: a pulling component 42121, which is slidably arranged on the inner wall of the air flotation chamber 41 and intermittently rolls and contacts and pulls the extrusion belt 4211 to open the extrusion channel 42111; and a transferring component 42122, which is installed on the inner wall of the air flotation chamber 41 and makes the pulling component 42121 that contacts the extrusion belt 4211 move synchronously with the extrusion belt 4211 and makes the pulling component 42121 that leaves the extrusion belt 4211 return.

[0061] In this embodiment, when pulling the extrusion belt 4211, the pulling component 4212 uses the pulling component 42121 to pull the belt surface toward both sides along the conveying direction of the extrusion belt body 4211, so that the extrusion channel 42111 on the belt body is opened. When the floc enters the extrusion channel 42111, the pulling component 42121 releases the extrusion belt body 4211, and the extrusion channel 42111 squeezes the floc. When the pulling component 42121 contacts the extrusion belt body 4211, in order to ensure that the pulling force of the pulling component 42121 on both sides is the same, the transfer component 42122 will move with the pulling component 42121 following the extrusion belt body 4211 until the pulling component 42121 leaves the belt surface.

[0062] It should be supplemented that the air-floating belt body 42112 includes a transversely arranged inelastic line y and a longitudinally arranged elastic member x, and the inelastic line y and the elastic member x are alternately arranged to form an extrusion channel 42111.

[0063] like Figure 8 As shown, the pulling component 42121 includes: a sliding frame 421211; a pulling roller component 421212 installed on the sliding frame 421211 along the width direction of the extrusion belt 4211; and a pulling power component 421213 installed on the sliding frame 421211 and used for driving the pulling roller component 421212 to rotate; the surface of the pulling roller component 421212 is provided with a notch 411214 for rotating away from the surface of the extrusion belt 4211.

[0064] In this embodiment, when the pulling component 42121 is performing the pulling action, it drives the sliding frame 421211 to move back and forth in the flotation chamber 41 along the conveying direction of the flotation belt 42112 through the transfer component 42122, and at the same time, the pulling roller 421212 rotates continuously. When the surface of the pulling roller 421212 contacts the flotation belt 42112, it will be pulled toward both sides. When the pulling tube 421212 rotates to the point where the notch 411214 corresponds to the flotation belt 42112, the flotation belt 42112 is separated from the pulling roller 421212, thereby causing the extrusion channel 42111 to elastically contract and extrude the flocs.

[0065] The pulling assembly 42121 also includes a pulling motor 4212121 installed on the sliding frame 421211, and a transmission belt 4212122 that transmits and connects the power end of the pulling motor 4212121 to the pulling roller 421211. The pulling motor 4212121 is preferably a servo motor.

[0066] like Figure 8 As shown, the transfer assembly 42122 includes: a transfer roller 421221 rotatably installed in the air flotation chamber 41; a transfer channel 421222 that is symmetrically spiral and connected and opened on the surface of the transfer roller 421221; and a guide member 421223 with one end installed on the sliding frame 421211 and the other end inserted in the transfer channel 421222.

[0067] In this embodiment, the movable roller 421221 is driven to rotate by the power of a servo motor, so that the guide member 421223 is guided to move in the transfer channel 421222, and then under the moving guidance, the sliding frame 421211 can move back and forth in the moving direction and the opposite direction of the air-floating belt.

[0068] Embodiment 2

[0069] like Fig. 9 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0070] The scraper belt assembly 422 includes: a scraper 4221 installed on the inner wall of the air flotation chamber 41 and obliquely pressed against the surface of the extrusion belt assembly 421; a cushion member 4222 provided on the other side of the extrusion belt assembly 421 and corresponding to the scraper 4221; and a pushing assembly 4223 provided on one side of the bottom of the scraper member 4221 to push the scraped material at the bottom of the scraper member 4221 to the extrusion belt assembly 421.

[0071] In this embodiment, when the scraping belt assembly 422 scrapes and cleans both sides of the S-shaped air-floating belt body 42112, the belt surface is pressed against the cushion 4222 through the scraping member 4221. When the air-floating belt body 42112 moves upward, the flocs are scraped off, and the pushing assembly 4223 pushes the flocs under the scraping member 4221, so that the flocs are pushed into the extrusion channel 42111.

[0072] like Fig. 9 and 10As shown, the pushing assembly 4223 includes: a pushing power member 42231 installed at the bottom of the scraper 4221; a pushing block 42232 installed on the power end of the pushing power member 42231 and moving back and forth along the oblique arrangement direction of the scraper 4221; and one side of the pushing block 42232 corresponding to the extrusion belt assembly 421 is arranged obliquely.

[0073] In this embodiment, the pushing block 42232 is driven to move toward one side of the belt surface by the pushing power member 42231 which is preferably a cylinder, thereby pushing the belt surface to bulge inward and elastically stretching the belt surface, so that the extrusion channel 42111 elastically opens to accommodate the flocs.

[0074] Embodiment 3

[0075] like Fig.12 As shown, a process for treating antibiotic-containing pharmaceutical wastewater comprises the following steps:

[0076] Step 1: Wastewater aeration process: Collect synthetic wastewater and pass it into the 1# aeration regulating tank for treatment;

[0077] Step 2: Fluidized bed Fenton pretreatment process, the wastewater treated in the aeration regulating tank is subjected to fluidized bed Fenton pretreatment;

[0078] Step 3: Sedimentation treatment process: the fermentation wastewater enters the 2# fermentation wastewater collection tank for sedimentation;

[0079] Step 4: Floc flotation process. The fermentation wastewater has a large organic matter content. After partial hydrolysis in the regulating tank, suspended matter will be produced, so it is pre-treated by full-pressure flotation. In the process of full-pressure flotation pre-treatment, the flocs are mechanically squeezed to effectively reduce the moisture content in the flocs, which is not only conducive to adsorption and combination with microbubbles, but also conducive to the full rise of the flocs, thereby improving the filtration effect of the drug residue.

[0080] Step 5: Aeration and regulation process: the effluent from the Fenton reaction tank, fermentation pretreatment wastewater, domestic sewage and other wastewater enter the 3# aeration and regulation tank;

[0081] Step 6: aerobic degradation process. The regulated wastewater enters the aerobic tank. The aerobic tank adopts the ABR process construction system, adopts a medium-temperature aerobic reactor, and adds an aeration and stirring system inside to provide an aerobic environment; improve the effect of difficult-to-degrade wastewater such as medicine;

[0082] Step 7, anaerobic treatment process, the ABR hydrolysis acidification effluent enters the MEGSB anaerobic treatment system using a medium-temperature anaerobic reactor;

[0083] Step 8: Anaerobic precipitation process: the anaerobic effluent enters the subsequent coagulation sedimentation tank; a sedimentation tank is set up after the anaerobic process to prevent the loss of sludge after anaerobic shock, and if the anaerobic effluent has a high sulfide content, it can be removed by adding drugs to avoid affecting the subsequent biochemical process;

[0084] Step 9, aerobic treatment process, anaerobic sedimentation effluent enters the aerobic treatment system to improve denitrification capacity, filler is installed inside to increase sludge concentration, cyclone aeration system is used in the front of the aerobic tank to prevent scaling, and microporous hose aeration is used in the back to improve oxygen utilization and ammonia nitrogen oxidation effect, all of which are hoistable installations;

[0085] Step 10: Discharge process: aerobic effluent enters the coagulation sedimentation tank and then meets the discharge standards;

[0086] Step 11, concentration process, the residual sludge and air flotation scum from the biochemical treatment enter the sludge concentration tank, and are concentrated by gravity under the action of the sludge stirring concentrator; the concentrated sludge is pumped into the filter press for dehydration treatment, the mud cake is collected and transported to the outside for treatment, and the filtrate is returned to the treatment system; the supernatant of the concentration tank is returned to the sewage treatment system; the dehydration adopts the method of spiral pre-concentration + plate and frame dehydration to separate the biochemical sludge and the physicochemical sludge;

[0087] The floc flotation process includes the following steps when separating flocs in wastewater:

[0088] 1) Ventilation: add flocculant PAC and coagulant aid PAM into the wastewater in the first treatment part 2. After flocculation reaction, pass the flocculated wastewater from the bottom of the air flotation chamber 41 to the lower part of the extrusion assembly 42 to be squeezed;

[0089] 2) Microbubble adsorption: gas is introduced into the ventilation component 43, and the gas forms microbubbles below the pinching area of ​​each layer of the extrusion belt 4211, and then the microbubbles are adsorbed on the surface of the flocs, so that the flocs in the suspended state continue to rise under the action of the buoyancy of the bubbles;

[0090] 3) Floc extrusion: When the flocs with attached microbubbles reach the extrusion belt 4211, the pulling component 4212 pulls the extrusion belt 4211, so that the extrusion channel 42111 on the extrusion belt 4211 elastically opens, and then in the open state, the flocs that continue to rise enter the extrusion channel 42111, and then the pulling component 4212 releases the extrusion belt 4211, and the extrusion channel 42111 rebounds and squeezes the flocs, squeezing out the water in the flocs. When the pulling component 4212 opens the extrusion channel 42111 again, the extruded flocs rise rapidly due to the buoyancy;

[0091] 4) Release the flocs. In step 3, when the pulling assembly 4212 is in motion, the pulling roller 421212 rotates and contacts the surface of the extrusion belt 4211, and pulls along the conveying direction and the reverse direction of the extrusion belt 4211, so that the extrusion channel 42111 is opened, and when the pulling roller 421212 continues to rotate, the notch 411214 corresponds to the extrusion belt 4211. At this time, the extrusion belt 4211 is in a loose state, the extrusion channel 42111 contracts, and the flocs are elastically squeezed;

[0092] 5) Belt surface cleaning: The S-shaped air-floating belt body 42113 formed by the air-floating roller 42113 is on the side during the conveying process. The scraper 4221 is set low on the surface of the extrusion belt assembly 421. As the extrusion belt assembly 421 moves, the belt surface is cleaned. The pushing assembly 4223 reciprocates to push the scraped flocs toward one side and push them into the extrusion channel 42111 opened by the pushing block 42232 for extrusion;

[0093] 6) Flushing the belt surface. The continuously transported air-floating belt body 42112 is transferred to the flushing roller 42114. The flushing assembly 4213 flushes the surface of the air-floating belt body 42112 after being arranged by the flushing roller 42114 which is arranged obliquely in the width direction of the air-floating belt body 42112, so that the impact water passes through the extrusion channel 42111 on the surface of the air-floating belt body 42112, and cleans the two sides of the air-floating belt body 42112 respectively.

[0094] 7) Floc separation: the flocs after flotation treatment rise to the top of the liquid surface and are salvaged through the third treatment unit 3.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for treating antibiotic-containing medical wastewater, comprising an air flotation treatment system, the air flotation treatment system comprising: Flotation tank; A first treatment section for mixing flocculants, coagulants and wastewater is disposed on one side of the flotation tank; as well as A third processing section, which is used to salvage and separate the floccules that float out after treatment, is disposed on the other side of the flotation tank; It is characterized by further comprising: A second treatment part, which is used to make the suspended flocs float to the surface of the wastewater and is arranged between the first treatment part and the third treatment part; The second processing unit includes: Air flotation chamber; An extrusion assembly, the extrusion assembly for squeezing and squeezing out moisture from the flocs, is arranged from bottom to top in the air flotation chamber; and A ventilation component, used for introducing gas constituting microbubbles, is installed below the flocculent pressing of the extrusion component; The extrusion assembly comprises: The squeezing belt assembly is used for reciprocating squeezing action to make the flocs with microbubbles attached to the surface float and drain water, and the squeezing belt assembly is arranged layer by layer in the flotation chamber; and A scraping belt assembly, used for scraping the flocs not squeezed on the squeezing belt assembly to the pinching area, wherein the scraping belt assembly is arranged on one side of the squeezing belt assembly; The extruded belt assembly comprises: An extrusion belt, wherein the extrusion belt is penetrated by a plurality of groups of extrusion channels and arranged in a closed loop; A pulling assembly, which follows the continuously moving extrusion belt and pulls the extrusion channel to elastically open. The pulling assembly is arranged on the upper and lower sides of each layer of the extrusion belt; and A flushing component is installed on the inner wall of the air flotation chamber to push water to flush the extruded belt at the top of the air flotation chamber to one side.

2. The antibiotic-containing medical wastewater treatment system according to claim 1, characterized in that: The extruded strip comprises: Air flotation belt body; An air flotation roller, wherein the air flotation roller is arranged at one side of the bottom of the air flotation chamber so that the air flotation belt is arranged in a vertical S shape; and The flushing roller member is configured so that the air flotation belt on one side of the top of the air flotation roller member is arranged in an S shape in the horizontal direction and corresponds to the flushing assembly.

3. The antibiotic-containing medical wastewater treatment system according to claim 2, characterized in that: The flushing roller is arranged obliquely along the width direction of the air-floating belt body, so that the air-floating belt body and the flushing direction of the flushing assembly are arranged at an angle α.

4. The antibiotic-containing medical wastewater treatment system according to claim 1, characterized in that: The pulling assembly comprises: A pulling component is intermittently rolled to contact and pull the extrusion belt to open the extrusion channel, and is slidably disposed on the inner wall of the air flotation chamber; and The transfer assembly is installed on the inner wall of the air flotation chamber, and makes the pulling assembly contacting the extrusion belt move synchronously with the extrusion belt and makes the pulling assembly leaving the extrusion belt return.

5. The antibiotic-containing medical wastewater treatment system according to claim 4, characterized in that: The involved components include: Sliding rack; A pulling roller member mounted on the slide frame along the width direction of the extruded strip member; and A pulling power member installed on the sliding frame and used for driving the pulling roller member to rotate; A notch is provided on the surface of the pulling roller for rotating away from the surface of the extrusion belt.

6. The antibiotic-containing medical wastewater treatment system according to claim 5, characterized in that: The transfer assembly comprises: Rotating a transfer roller installed in the air flotation chamber; A symmetrical spiral connected to a transfer channel opened on the surface of the transfer roller; and A guide member having one end mounted on the sliding frame and the other end inserted into the transfer channel.

7. A system for treating antibiotic-containing medical wastewater according to any one of claims 1 to 6, characterized in that: The scraper belt assembly comprises: A scraper installed on the inner wall of the air flotation chamber and obliquely against the surface of the extrusion belt assembly; a cushion member disposed on the other side of the extrusion belt assembly and corresponding to the scraper member; and A pushing component is arranged at one side of the bottom of the scraper and pushes the scraped material at the bottom of the scraper to the extrusion belt component.

8. The process for separating flocs in a system for treating antibiotic-containing pharmaceutical wastewater according to claim 7, characterized in that: The following steps are involved: Step 1: ventilation, adding flocculant PAC and coagulant aid PAM into the wastewater in the first treatment part, and after flocculation reaction, passing the flocculated wastewater from the bottom of the air flotation chamber to the bottom of the extrusion assembly to be squeezed; Step 2: Microbubble adsorption: gas is introduced into the ventilation component, and the gas forms microbubbles under the pinching area of ​​each layer of the extrusion belt. Then the microbubbles are adsorbed on the surface of the flocs, so that the flocs in the suspended state continue to rise under the action of the buoyancy of the bubbles. Step 3: floc extrusion. When the flocs with attached microbubbles reach the extrusion belt, the pulling component pulls the extrusion belt to elastically open the extrusion channel on the extrusion belt. Then, in the open state, the flocs that continue to rise enter the extrusion channel. Then, the pulling component releases the extrusion belt, and the extrusion channel rebounds and squeezes the flocs to squeeze out the water in the flocs. When the pulling component opens the extrusion channel again, the extruded flocs rise rapidly due to the buoyancy. Step 4: releasing the flocs. In step 3, when the pulling assembly is in action, the pulling roller rotates and contacts the surface of the extrusion belt, and pulls along the conveying direction and the reverse direction of the extrusion belt, so that the extrusion channel is opened, and when the pulling roller continues to rotate, the notch corresponds to the extrusion belt. At this time, the extrusion belt is in a loose state, the extrusion channel shrinks, and the flocs are elastically squeezed; Step 5: scraping the belt surface. The scraper is set on the side of the S-shaped air-floating belt body during the conveying process. As the extrusion belt assembly moves, the belt surface is scraped. The pushing assembly reciprocates to push the scraped flocs toward one side and push them into the extrusion channel opened by the pushing block for extrusion. Step 6: flushing the belt surface. The continuously transported air-floating belt body is transferred to the flushing roller. The flushing assembly flushes the surface of the air-floating belt body after being arranged by the flushing roller arranged obliquely in the width direction of the air-floating belt body, so that the impact water passes through the extrusion channel on the surface of the air-floating belt body, and cleans the two sides of the air-floating belt body respectively. Step seven, floc separation, the flocs after flotation treatment rise to the top of the liquid surface and are salvaged through the third treatment section.

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