Medical wastewater environmental protection treatment device and treatment method

Abstract

This application relates to a medical wastewater environmental protection treatment device and a treatment method. The treatment device includes: a treatment tank; a filter barrel rotatably installed in the treatment tank, and its rotation axis is parallel to the horizontal plane. A plurality of filter holes are penetrated only on the arc-shaped outer peripheral wall of the filter barrel, and one axial end of the filter barrel is provided with a transparent panel; a first ultraviolet lamp, the light irradiation direction of which corresponds to the transparent panel; a slag scraping mechanism for scraping the suspended matter adhered to the inner peripheral wall of the arc surface of the filter barrel when the water level in the filter barrel rises to a set value; a driving mechanism for driving the filter barrel to rotate in the treatment tank; a pre-disinfection tank, the input end of the pre-disinfection tank is communicated with the wastewater source, and the output end is connected with a water supply pipe extending into the filter barrel; a chlorine dioxide disinfection system is arranged in the pre-disinfection tank. Through the chlorine dioxide disinfection system and the first ultraviolet lamp, this application can comprehensively disinfect medical wastewater and its suspended matter, and can decompose chlorine dioxide residues and their by-products.

Description

Technical Field

[0001] The present application relates to the technical field of medical wastewater treatment, and in particular to an environmentally friendly medical wastewater treatment device and a treatment method. Background Art

[0002] Medical sewage is mainly the sewage discharged from the consulting rooms, laboratories, wards, laundry rooms, X-ray photography rooms, operating rooms, etc. of hospitals, and its sewage sources and components are very complex. Medical wastewater contains a large amount of pollutants such as organic matter, chemical drugs, pathogens (such as bacteria, viruses, and parasites). If it is directly discharged without treatment, it will cause serious pollution to the environment and may spread diseases through water sources, with the characteristics of spatial pollution, acute infection, and latent infection. Therefore, medical wastewater needs to be thoroughly treated before being discharged.

[0003] In the related technology, the Chinese patent with the application number CN202411231397.5 proposed a multi-stage medical wastewater treatment system. It includes a physical treatment unit, a chemical treatment unit, a biological treatment unit, and a disinfection unit connected in sequence; the physical treatment unit includes a filtration tank, the chemical treatment unit includes an adjustment tank, the biological treatment unit includes an aeration tank, and the disinfection unit includes a disinfection tank. The inlet of the filtration tank is connected to an external wastewater source, the outlet of the filtration tank is connected to the inlet of the adjustment tank, the outlet of the adjustment tank is connected to the inlet of the aeration tank, and the outlet of the aeration tank is connected to the inlet of the disinfection tank. This application sequentially performs physical filtration, chemical adjustment, biodegradation, and disinfection treatment on the wastewater through the physical treatment unit, chemical treatment unit, biological treatment unit, and disinfection unit, comprehensively using physical, chemical, and biological treatment methods, and removing various pollutants in the wastewater in stages and targeted manner, so as to achieve the purpose of discharging up to standard, protecting the ecological environment, and public health.

[0004] The above-mentioned related technology has the following defects: Medical wastewater usually contains blood, tissue fragments, cells, patient secretions and excreta, etc. These substances will form suspended solids in the wastewater, and also contain a large number of pathogens. After the disinfection system is placed at the back in general wastewater treatment systems, although these suspended solids are separated in the early stage, they are not disinfected, which affects the thoroughness of medical wastewater treatment. Moreover, the commonly used highly efficient disinfectant chlorine dioxide destroys the cell walls and cell membranes of microorganisms through oxidation during disinfection, and its residues may also be converted into suspended solids, resulting in the need for secondary treatment of the disinfected wastewater. At the same time, there will be residues and by-products after chlorine dioxide disinfection, which also affects the treatment efficiency and treatment quality of medical wastewater. Summary of the Invention

[0005] In order to improve the problems that the suspended solids in the wastewater are not disinfected in the existing medical wastewater treatment system and the disinfectant is likely to remain after disinfection, the present application provides a medical wastewater environmental protection treatment device and a treatment method.

[0006] The following technical solutions are adopted for a medical wastewater environmental protection treatment device provided in the first aspect of the present application:

[0007] A medical wastewater environmental protection treatment device includes a physical treatment unit, a chemical treatment unit, and a biological treatment unit connected in sequence. The physical treatment unit includes:

[0008] A treatment tank, whose output end is connected to the chemical treatment unit;

[0009] A filter barrel, rotatably installed in the treatment tank, and its rotation axis is parallel to the horizontal plane. Only a plurality of filter holes are penetrated through the outer peripheral wall of the arc surface of the filter barrel, and a first opening and a second opening are respectively arranged in the middle of its two ends. One end of the filter barrel in the axial direction is set as a transparent panel, and the first opening is arranged on the transparent panel;

[0010] A first ultraviolet lamp, arranged in the treatment tank, and its illumination direction corresponds to the transparent panel;

[0011] A slag scraping mechanism, arranged in the treatment tank, for scraping the suspended solids adhered to the inner peripheral wall of the arc surface of the filter barrel when the water level in the filter barrel rises to a set value;

[0012] A driving mechanism, used to drive the filter barrel to rotate in the treatment tank; and

[0013] A pre - disinfection tank, whose input end is communicated with the wastewater source, and the output end is connected with a water supply pipe whose free end extends from the first opening to the inside of the filter barrel; A chlorine dioxide disinfection system for disinfecting the wastewater in the pre - disinfection tank is arranged in the pre - disinfection tank.

[0014] Furthermore, the radius of the filter barrel is not less than twice the axial width of the filter barrel.

[0015] Furthermore, a filter layer that completely covers all the filter holes is attached to the inner peripheral wall of the arc surface of the filter barrel.

[0016] Furthermore, a plurality of spoiler bars arranged along the radial direction of the filter barrel are integrally formed on the side of the transparent panel facing away from the first ultraviolet lamp.

[0017] Furthermore, the slag scraping mechanism includes:

[0018] A central axis, coaxially arranged with the filter barrel, and one end of it extends into the filter barrel from the second opening;

[0019] A control rod is arranged radially along the filter barrel and is lifted and slidably arranged on the central axis, and the control rod is located in the filter barrel;

[0020] A scraper cover is fixedly connected to the upper end of the control rod and arranged along the axial direction of the filter barrel, and one side of the two sides is a high side and the other side is a low side, and the rotation direction of the filter barrel is from the low side of the scraper cover to the high side of the scraper cover;

[0021] a slag conveying pipe, connected to one end of the scraper cover close to the second opening and extending to the outside of the filter barrel; and

[0022] The liquid level assembly is used to monitor the water level in the filter barrel and drive the control rod to move up to the high side of the scraper cover to contact the inner peripheral wall of the filter barrel arc surface when the water level in the filter barrel reaches a set value.

[0023] Furthermore, the liquid level component comprises:

[0024] A floating ball is fixedly connected to the bottom end of the control rod, and when the high side of the scraper cover contacts the inner peripheral wall of the filter barrel arc surface, the floating ball does not exceed the lowest edge of the first opening.

[0025] Furthermore, a guide cylinder is fixedly connected to the central axis and radially penetrates the central axis, and the control rod is slidably arranged in the guide cylinder. An end of the central axis close to the first opening is fixedly connected to a water retaining plate coaxially arranged with the filter barrel, and the outer diameter of the water retaining plate is larger than the outer diameter of the second opening.

[0026] Furthermore, a hollow portion is provided in the central axis, the slag conveying pipe is provided as a hose and passes through the hollow portion, and a negative pressure suction device is connected to one end of the slag conveying pipe away from the slag scraping cover.

[0027] Furthermore, a delivery pipe and a delivery pump are connected to the bottom of the processing box, the delivery pipe is connected to a transparent spiral coil, a second ultraviolet lamp is arranged along its spiral axis at the central axis of the transparent spiral coil, the bottom end of the transparent spiral coil is connected to the delivery pipe, and the top end is connected to the chemical treatment unit.

[0028] The second aspect of the present application provides an environmentally friendly method for treating medical wastewater using the following technical solution:

[0029] A method for environmentally friendly treatment of medical wastewater, based on the above-mentioned environmentally friendly treatment device for medical wastewater, comprises the following steps:

[0030] S1. The medical wastewater is transported to the pre-disinfection tank, and the wastewater is pre-disinfected for a certain period of time by the chlorine dioxide disinfection system to obtain first-stage treated wastewater;

[0031] S2. The first-stage treated sewage is transported to the filter barrel through the water supply pipe, the filter barrel is driven to rotate and the first ultraviolet lamp is turned on. When the filter barrel rotates, the first-stage treated sewage is filtered to obtain second-stage treated sewage, and the suspended solids in the first-stage treated sewage adhere to the inner circumferential wall of the arc surface of the filter barrel under the action of centrifugal force;

[0032] S3. The second-stage treated sewage is subjected to secondary disinfection and decomposition of residual chlorine dioxide and its by-products under the irradiation of the first ultraviolet lamp, and the suspended solids adhering to the inner circumferential wall of the arc surface of the filter barrel are disinfected under the irradiation of the first ultraviolet lamp;

[0033] S4. When the suspended solids adhering to the inner circumferential wall of the arc surface of the filter barrel are so many that the sewage level in the filter barrel rises to the set value, the slag scraping mechanism starts and scrapes the suspended solids adhering to the inner circumferential wall of the arc surface of the filter barrel, promoting the discharge of the sewage in the filter barrel;

[0034] S5. The second-stage treated sewage discharged from the filter barrel enters the treatment tank and is sequentially transported to the chemical treatment unit and the biological treatment unit for subsequent treatment.

[0035] In summary, the beneficial technical effects of the present application are as follows:

[0036] 1. After the chlorine dioxide disinfection system in the pre-disinfection tank pre-disinfects the medical wastewater, it is transported to the filter barrel through the water supply pipe. After the driving mechanism drives the filter barrel to rotate and the first ultraviolet lamp is turned on, when the filter barrel rotates at a high speed, the first-stage treated sewage is filtered, and the sewage passing through the filter holes of the filter barrel enters the treatment tank to form second-stage treated sewage, while the suspended solids in the first-stage treated sewage adhere to the inner circumferential wall of the arc surface of the filter barrel under the action of centrifugal force, slowing down the filtration process. This can prevent a large amount of the first-stage treated sewage from being filtered prematurely, resulting in too short a residence time in the filter barrel, and at the same time ensure the penetration rate of ultraviolet light in the first-stage treated sewage;

[0037] 2. When the first ultraviolet lamp is turned on, the ultraviolet light emitted by it passes through the transparent panel and irradiates on the first-stage treated sewage in the filter barrel and the suspended solids adhering to the inner circumferential wall of the arc surface of the filter barrel, which can comprehensively disinfect the medical wastewater and its suspended solids without the need for secondary disinfection of the filtered suspended solids; and because the disinfection method of ultraviolet light cooperates with the chlorine dioxide disinfection system in the pre-disinfection tank, it can comprehensively kill the pathogens and bacteria in the medical sewage, and can also reduce the usage amount of chlorine dioxide in the chlorine dioxide disinfection system to a certain extent. Moreover, the ultraviolet light emitted by the first ultraviolet lamp can also decompose the residual chlorine dioxide in the first-stage treated sewage and the by-products after chlorine dioxide disinfection, further reducing the disinfection residue and improving the cleanliness of the treated sewage;

[0038] 3. When a large amount of suspended matter adheres to the inner circumference of the curved surface of the filter barrel, the discharge amount of the first-stage treated sewage from the filter barrel decreases, while the amount of the first-stage treated sewage transported to the filter barrel by the water inlet pipe remains unchanged, resulting in an increase in the water level in the filter barrel, which is convenient for more thorough ultraviolet disinfection of the first-stage treated sewage in the filter barrel and more thorough disinfection of the suspended matter adhering to the inner circumference of the curved surface of the filter barrel. Once the water level in the filter barrel rises to the set value, the float drives the scraper cover to press against the filter layer through the control rod to scrape off the suspended matter adhering to the inner circumference of the curved surface of the filter barrel. At this time, the first-stage treated sewage that has been disinfected by ultraviolet light is discharged from the filter barrel, and the suspended matter that has been disinfected by ultraviolet light is also scraped off. The filter barrel continues to treat the first-stage treated sewage that is continuously introduced. Such a cycle can achieve continuous disinfection and filtration of the first-stage treated sewage. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0040] Figure 2 is a schematic cross-sectional structural diagram of a processing box according to an embodiment of the present application;

[0041] Figure 3 yes Figure 2 A partial enlarged schematic diagram of part A;

[0042] Figure 4 It is a schematic cross-sectional structure diagram mainly used to show the cross section of the scraper cover in the embodiment of the present application;

[0043] Figure 5 yes Figure 2 A partial enlarged schematic diagram of part B.

[0044] Description of reference numerals:

[0045] 11. Chemical treatment unit; 12. Biological treatment unit;

[0046] 2. Processing box; 21. Delivery pipe; 22. Delivery pump; 23. Transparent spiral coil;

[0047] 3. filter barrel; 31. first opening; 32. second opening; 33. transparent panel; 331. spoiler strip; 34. filter layer;

[0048] 41. a first ultraviolet lamp; 42. a second ultraviolet lamp;

[0049] 5. Pre-disinfection tank; 51. Water supply pipe; 52. Chlorine dioxide disinfectant adding device; 53. Stirring device;

[0050] 61. Central axis; 611. Hollow part; 62. Control rod; 63. Slag scraping cover; 631. High edge; 632. Low edge; 64. Slag conveying pipe; 65. Floating ball; 66. Guide cylinder; 67. Water baffle; 68. Negative pressure suction device;

[0051] 71. Driving wheel; 72. Driving pulley; 73. Driving motor. Detailed implementation mode

[0052] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0053] An embodiment of the present application discloses a medical wastewater environmental protection treatment device. Refer to Figure 1 . Figure 2 And Figure 3 , which includes a physical treatment unit, a chemical treatment unit 11 and a biological treatment unit 12 connected in sequence. The physical treatment unit includes:

[0054] Treatment tank 2, whose output end is connected to the chemical treatment unit 11.

[0055] Filter barrel 3, rotatably installed in the treatment tank 2, and its rotation axis is parallel to the horizontal plane. Only a plurality of filter holes are penetrated through the outer peripheral wall of the arc surface of the filter barrel 3. The middle parts of both ends are respectively provided with a first opening 31 and a second opening 32. One axial end of the filter barrel 3 is provided with a transparent panel 33 and the first opening 31 is opened on the transparent panel 33. Specifically, the transparent panel 33 is made of high borosilicate glass, and the rest of the filter barrel 3 is made of stainless steel. And to improve the stability of the transparent panel 33 on the filter barrel 3, a support frame is provided on the side of the filter barrel 3 where the transparent panel 33 is provided to strengthen the structure of the transparent panel 33.

[0056] First ultraviolet lamp 41, arranged in the treatment tank 2, and its illumination direction corresponds to the transparent panel 33. When specifically configured, a plurality of first ultraviolet lamps 41 are arranged in a ring or arranged radially along the filter barrel 3 and are equally spaced in an array along the axis of the filter barrel 3.

[0057] Slag scraping mechanism, arranged in the treatment tank 2, used to scrape the suspended matter adhered to the inner peripheral wall of the arc surface of the filter barrel 3 when the water level in the filter barrel 3 rises to a set value.

[0058] Driving mechanism, used to drive the filter barrel 3 to rotate at a high speed with the axis of the filter barrel 3 as the rotation axis in the treatment tank 2. And

[0059] A pre - disinfection tank 5 is provided. The input end of the pre - disinfection tank 5 is connected to the wastewater source, and the output end is connected with a water supply pipe 51 whose free end extends from the first opening 31 to the filter barrel 3. A chlorine dioxide disinfection system for disinfecting the wastewater in the pre - disinfection tank 5 is arranged in the pre - disinfection tank 5. Specifically, the chlorine dioxide disinfection system includes a chlorine dioxide disinfectant adding device 52 and a stirring device 53 arranged on the disinfection tank. The chlorine dioxide disinfectant adding device 52 and the stirring device 53 are both conventional technologies and will not be elaborated here.

[0060] Thus, when treating medical wastewater, first, the solid waste in the medical wastewater is filtered out, and then the treated medical wastewater is introduced into the pre - disinfection tank 5. A set amount of chlorine dioxide disinfectant is introduced into the pre - disinfection tank 5 through the chlorine dioxide disinfectant adding device 52, and then stirring is carried out by means of the stirring device 53 to accelerate the mixing uniformity of the medical wastewater and the chlorine dioxide disinfectant. Moreover, to improve the disinfection efficiency of the chlorine dioxide disinfectant, a constant - temperature heating device can also be arranged in the pre - disinfection tank 5 to keep the temperature in the pre - disinfection tank 5 at the optimal reaction temperature of 20°C - 40°C.

[0061] After the pre - disinfection in the pre - disinfection tank 5 is completed, the first - order treated sewage is obtained. Since the disinfection of medical sewage by chlorine dioxide disinfectant mainly destroys the cell walls and cell membranes of microorganisms, there are still a certain amount of suspended solids in the first - order treated sewage, and there are also small amounts of chlorine dioxide residues and disinfection by - products, such as chlorate and chlorite. At this time, the first - order treated sewage is transported to the filter barrel 3 through the water supply pipe 51. After the driving mechanism drives the filter barrel 3 to rotate and the first ultraviolet lamp 41 is turned on, when the filter barrel 3 rotates at a high speed, the first - order treated sewage is filtered. The sewage passing through the filter holes of the filter barrel 3 enters the treatment tank 2 to form the second - order treated sewage, while the suspended solids in the first - order treated sewage adhere to the inner circumferential wall of the arc surface of the filter barrel 3 under the action of centrifugal force, slowing down the filtration process. This can prevent a large amount of the first - order treated sewage from being filtered prematurely, resulting in too short a residence time in the filter barrel 3, and at the same time, ensure the penetration rate of ultraviolet light in the first - order treated sewage.

[0062] Due to the activation of the first ultraviolet lamp 41, the ultraviolet light emitted by it passes through the transparent panel 33 and irradiates on the first-stage treated sewage in the filter barrel 3 and the suspended matters adhering to the inner peripheral wall of the arc surface of the filter barrel 3, enabling the disinfection of both without the need for secondary disinfection of the filtered suspended matters. Moreover, since the disinfection method of ultraviolet light is to kill or inhibit the activity of pathogens by destroying the DNA or RNA structure, it can cooperate with the chlorine dioxide disinfection system in the pre-positioned disinfection tank 5 to comprehensively kill and eliminate the pathogens and bacteria in the medical sewage, and can also reduce the usage amount of chlorine dioxide in the chlorine dioxide disinfection system to a certain extent. Additionally, the ultraviolet light emitted by the first ultraviolet lamp 41 can also decompose the residual chlorine dioxide and the by-products after chlorine dioxide disinfection in the first-stage treated sewage, further reducing the disinfection residues and improving the cleanliness of the treated sewage.

[0063] After a large amount of suspended matters adhere to the inner peripheral wall of the arc surface of the filter barrel 3, the discharge amount of the first-stage treated sewage from the filter barrel 3 decreases, while the amount of the first-stage treated sewage transported into the filter barrel 3 by the water inlet pipe remains unchanged, resulting in the water level in the filter barrel 3 rising. This is convenient for the relatively sufficient ultraviolet disinfection of the first-stage treated sewage in the filter barrel 3 and also convenient for the relatively sufficient disinfection of the suspended matters adhering to the inner peripheral wall of the arc surface of the filter barrel 3. Once the water level in the filter barrel 3 rises to the set value, the slag scraping mechanism is activated to scrape the suspended matters adhering to the inner peripheral wall of the arc surface of the filter barrel 3. At this time, the first-stage treated sewage that has been disinfected by ultraviolet light is discharged from the filter barrel 3, and the suspended matters that have been disinfected by ultraviolet light are also scraped off, and the filter barrel 3 continues to treat the continuously introduced first-stage treated sewage.

[0064] Specifically, to ensure the disinfection quality of the first-stage treated sewage in the filter barrel 3, referring to Figure 2 , the radius of the filter barrel 3 is not less than twice the axial width of the filter barrel 3. A plurality of flow disturbance strips 331 arranged radially along the filter barrel 3 are integrally formed on the side of the transparent panel 33 facing away from the first ultraviolet lamp 41. A filter layer 34 that completely covers all the filter holes is attached to the inner peripheral wall of the arc surface of the filter barrel 3. The slag scraping mechanism is used to scrape the suspended matters adhering to the filter layer 34. The filter layer 34 can be a filter cloth, a filter screen, etc., and can be replaced in time after wear, which can reduce the usage cost of the filter barrel 3.

[0065] Thus, through the setting of the shape of the filter barrel 3 and the disturbance effect of the plurality of flow disturbance strips 331 on the first-stage treated sewage when following the rotation of the filter barrel 3, the irradiated area of the first-stage treated sewage in the filter barrel 3 and the ultraviolet light emitted by the first ultraviolet lamp 41 can be greatly increased, ensuring the ultraviolet disinfection effect of the first ultraviolet lamp 41. As a consumable part, the filter layer 34 can be conveniently replaced when it is worn, improving the maintenance convenience of the treatment device of the present application.

[0066] Specifically, referring to Figure 2 、 Figure 3 andFigure 4 The above-mentioned scraping mechanism includes:

[0067] The middle axis 61 is coaxially arranged with the filter barrel 3 and one end of the middle axis 61 extends from the second opening 32 into the filter barrel 3;

[0068] The control rod 62 is arranged along the radial direction of the filter barrel 3 and is vertically lifted and slidably arranged on the central axis 61. The control rod 62 is located in the filter barrel 3;

[0069] The scraper cover 63 is fixedly connected to the upper end of the control rod 62 and is axially arranged along the filter barrel 3. Its upper end is open and points to the uppermost end of the arc-surface inner wall of the filter barrel 3. One side of the scraper cover 63 is a high side 631 and the other side is a low side 632. The rotation direction of the filter barrel 3 is from the low side 632 of the scraper cover 63 to the high side 631 of the scraper cover 63.

[0070] The slag conveying pipe 64 is connected to one end of the scraper cover 63 near the second opening 32 and extends to the outside of the filter barrel 3. The bottom of the scraper cover 63 is arranged from high to low in the direction from the first opening 31 to the second opening 32, so that the suspended matter scraped off the filter layer 34 by the high side 631 of the scraper cover 63 can slide smoothly along the inclined surface of the bottom of the scraper cover 63 into the slag conveying pipe 64. In addition, the cross section of the control rod 62 is C-shaped and its opening side is arranged away from the first opening 31, so that the slag conveying pipe 64 can be directly embedded in its opening groove, thereby reducing the space occupied by the control rod 62 and the slag conveying pipe 64 in the filter barrel 3. And

[0071] The liquid level assembly is used to monitor the water level in the filter barrel 3 and drive the control rod 62 to move up to the high side 631 of the scraper cover 63 to contact the inner circumferential wall of the curved surface of the filter barrel 3 when the water level in the filter barrel 3 reaches a set value.

[0072] Among them, refer to Figure 2 and Figure 5 , the liquid level components include:

[0073] The float 65 is fixed to the bottom end of the control rod 62, and when the high side 631 of the scraper cover 63 contacts the filter layer 34 on the curved inner wall of the filter barrel 3, the low side 632 of the scraper cover 63 is spaced apart from the filter layer 34, and the float 65 does not exceed the lowest edge of the first opening 31.

[0074] At the same time, the central axis 61 is fixedly connected with a guide cylinder 66 which is radially arranged therethrough, and the control rod 62 is slidably arranged in the guide cylinder 66, and the control rod 62 is a square tube to prevent the control rod 62 from rotating in the guide cylinder 66 and affecting the scraping effect of the scraper cover 63. The end of the central axis 61 close to the first opening 31 is fixedly connected with a water retaining plate 67 which is coaxially arranged with the filter barrel 3, and the outer diameter of the water retaining plate 67 is larger than the outer diameter of the second opening 32; and the central axis 61 is provided with a hollow part 611, and the slag conveying pipe 64 is provided as a hose and is arranged in the hollow part 611, and the end of the slag conveying pipe 64 which is away from the scraper cover 63 is connected with a negative pressure suction device 68.

[0075] In this way, when the water supply pipe 51 inputs the first-order treated sewage from the first opening 31 of the filter barrel 3, the first-order treated sewage impacts the water retaining plate 67 and is dispersed to the axial direction of the filter barrel 3, which facilitates the first-order treated sewage in the filter barrel 3 to rotate as a whole when the filter barrel 3 rotates, and also prevents the untreated first-order treated sewage from being directly discharged in large quantities from the second opening 32. When the water level of the first-order treated sewage in the filter barrel 3 rises, the float 65 also floats up, and can push the control rod 62 to move up in the guide cylinder 66, so that the high side 631 of the scraper cover 63 contacts the filter layer 34 on the inner peripheral wall of the curved surface of the filter barrel 3. As the filter barrel 3 continues to rotate, the suspended matter attached to the filter layer 34 passes over the low side 632 of the scraper cover 63 and is scraped off by the high side 631 of the scraper cover 63 and falls on the bottom side of the scraper cover 63, and slides along the inclined surface on the bottom side of the scraper cover 63 to the slag conveying pipe 64 and is discharged from the filter barrel 3. If necessary, the negative pressure suction device 68 can also be turned on to perform negative pressure suction on the suspended matter accumulated in the scraper cover 63 to improve the cleaning efficiency of the suspended matter adhered to the filter barrel 3.

[0076] After the scraper cover 63 scrapes off the suspended matter on the inner peripheral wall of the curved surface of the filter barrel 3, the first-stage treated sewage in the filter barrel 3 passes through the filter holes under the high-speed rotation of the filter barrel 3 and enters the treatment box 2; and as the water supply pipe 51 continues to pass the first-stage treated sewage containing suspended matter, the filter holes on the filter barrel 3 are gradually closed, and such a cycle can realize continuous disinfection and filtration treatment of the first-stage treated sewage.

[0077] In order to avoid the suspended matter attached to the filter layer 34 of the filter barrel 3 in the initial period after treatment, the first-stage treated sewage introduced into the water supply pipe 51 is directly filtered only, and the ultraviolet light disinfection time of the first ultraviolet lamp 41 is short, which affects the secondary disinfection and residue decomposition effect.

[0078] Further, see Figure 1 A delivery pipe 21 and a delivery pump 22 are also connected to the bottom of the processing box 2, the delivery pipe 21 is connected to a transparent spiral coil 23, a second ultraviolet lamp 42 is arranged along its spiral axis at the axis 61 of the transparent spiral coil 23, the bottom end of the transparent spiral coil 23 is connected to the delivery pipe 21, the top end is connected to the chemical treatment unit 11, and a light shield is provided on the outside of the transparent spiral coil 23 (not shown in the figure).

[0079] In this way, even if part of the first-stage treated water is disinfected by the ultraviolet light irradiated by the first ultraviolet lamp 41 in the filter barrel 3 for a short time, under the action of the delivery pump 22, the filtered second-stage treated sewage in the treatment box 2 will be transported from bottom to top to the transparent spiral coil 23, and irradiated by the second ultraviolet lamp 42 for ultraviolet light disinfection. Similarly, secondary disinfection and decomposition of residual chlorine dioxide and by-products after chlorine dioxide disinfection can be ensured, thereby ensuring the cleanliness of the treated sewage as much as possible.

[0080] In addition, refer to Figure 2 The filter barrel 3 is provided with one end of the second opening 32 and is rotatably mounted on the outer peripheral wall of the central axis 61. The transparent panel 33 is rotatably mounted on the outer peripheral wall of the water supply pipe 51. The driving mechanism is configured as a transmission wheel 71 coaxially fixed to one end of the filter barrel 3 with the second opening 32. A driving wheel 72 and a driving motor 73 for driving the driving wheel 72 to rotate are rotatably mounted outside the treatment box 2. The driving wheel 72 and the transmission wheel 71 can be sprockets or pulleys, or synchronous wheels, and the two are connected by a chain or belt, or a synchronous belt.

[0081] This can greatly ensure the stability of the filter barrel 3 during high-speed rotation, and will not cause significant interference to the ultraviolet light irradiation of the first ultraviolet lamp 41, so as to ensure a stable filtering effect on the first-stage treated sewage.

[0082] Furthermore, the inner wall of the treatment box 2 is also configured to be a round cake shape that matches the outer shape of the filter barrel 3, and a reflective layer is attached to the curved inner wall and inner end wall of the treatment box 2 to ensure that the ultraviolet light irradiated by the first ultraviolet lamp 41 can be reflected by the reflective layer to ensure effective disinfection of the filter layer 34.

[0083] The present application embodiment discloses a method for environmentally friendly treatment of medical wastewater, based on the above-mentioned medical wastewater environmentally friendly treatment device, referring to Figure 1 and Figure 2 , which comprises the following steps:

[0084] S1. The medical wastewater is transported to the pre-disinfection tank 5, and the wastewater is pre-disinfected for a certain period of time by a chlorine dioxide disinfection system to obtain a first-stage treated sewage;

[0085] S2. The first-stage treated sewage is transported to the filter barrel 3 through the water supply pipe 51, the filter barrel 3 is driven to rotate and the first ultraviolet lamp 41 is turned on. When the filter barrel 3 rotates, the first-stage treated sewage is filtered to obtain the second-stage treated sewage. The suspended matter in the first-stage treated sewage adheres to the inner circumferential wall of the curved surface of the filter barrel 3 under the action of centrifugal force;

[0086] S3. The secondary treated sewage is disinfected under the first ultraviolet lamp 41 for secondary disinfection and the decomposition of residual chlorine dioxide and its byproducts, and the suspended matter adhering to the inner wall of the curved surface of the filter barrel 3 is disinfected under the first ultraviolet lamp 41;

[0087] S4. When there are many suspended solids adhering to the inner circumferential wall of the filter barrel 3 and the sewage level in the filter barrel 3 rises to a set value, the scraping mechanism starts and scrapes off the suspended solids adhering to the inner circumferential wall of the filter barrel 3 to promote the discharge of sewage in the filter barrel 3;

[0088] The secondary treated sewage discharged from the filter barrel 3 enters the treatment tank 2, and under the action of the delivery pump 22, it is conveyed from bottom to top to the transparent spiral coil 23 and is supplemented with disinfection by the ultraviolet light irradiated by the second ultraviolet lamp 42, and then is successively conveyed to the chemical treatment unit 11 and the biological treatment unit 12 for subsequent treatment.

[0089] The implementation principle of the medical wastewater environmental protection treatment device in the embodiment of the present application is as follows:

[0090] After the chlorine dioxide disinfection system in the pre-disinfection tank 5 pre-disinfects the medical wastewater, it is conveyed to the filter barrel 3 through the water supply pipe 51. After the driving mechanism drives the filter barrel 3 to rotate and the first ultraviolet lamp 41 is turned on, when the filter barrel 3 rotates at a high speed, the primary treated sewage is filtered. The sewage passing through the filter holes of the filter barrel 3 enters the treatment tank 2 to form secondary treated sewage, while the suspended matter in the primary treated sewage adheres to the inner circumferential wall of the arc surface of the filter barrel 3 under the action of centrifugal force, slowing down the filtration process. This can prevent a large amount of primary treated sewage from being filtered prematurely, resulting in too short a residence time in the filter barrel 3, and at the same time, it can ensure the penetration rate of ultraviolet light in the primary treated sewage.

[0091] Due to the turning on of the first ultraviolet lamp 41, the ultraviolet light irradiated by it passes through the transparent panel 33 and irradiates on the primary treated sewage in the filter barrel 3 and the suspended matter adhering to the inner circumferential wall of the arc surface of the filter barrel 3, which can disinfect both of them, and there is no need to disinfect the filtered suspended matter twice. And because the disinfection method of ultraviolet light is to kill or inhibit the activity by destroying the DNA or RNA structure of pathogens, it can cooperate with the chlorine dioxide disinfection system in the pre-disinfection tank 5 to comprehensively kill the pathogens and bacteria in the medical sewage, and can also reduce the usage amount of chlorine dioxide in the chlorine dioxide disinfection system to a certain extent. Moreover, the ultraviolet light irradiated by the first ultraviolet lamp 41 can also decompose the residual chlorine dioxide and the by-products after chlorine dioxide disinfection in the primary treated sewage, further reducing the disinfection residue and improving the cleanliness of the treated sewage.

[0092] When a relatively large amount of suspended matter adheres to the inner circumferential wall of the arc surface of the filter barrel 3, the discharge amount of the primary treated sewage from the filter barrel 3 decreases, while the amount of the primary treated sewage conveyed into the filter barrel 3 by the water inlet pipe remains unchanged, resulting in the water level in the filter barrel 3 rising. This is not only conducive to relatively sufficient ultraviolet disinfection of the primary treated sewage in the filter barrel 3, but also conducive to relatively sufficient disinfection of the suspended matter adhering to the inner circumferential wall of the arc surface of the filter barrel 3. Once the water level in the filter barrel 3 rises to the set value, the float 65 drives the slag scraping cover 63 to tightly press against the filter layer 34 through the control rod 62 to scrape the suspended matter adhering to the inner circumferential wall of the arc surface of the filter barrel 3. At this time, the primary treated sewage that has been disinfected by ultraviolet light is discharged from the filter barrel 3, and the suspended matter that has been disinfected by ultraviolet light is also scraped off. The filter barrel 3 continues to treat the continuously introduced primary treated sewage. Such a cycle can achieve continuous disinfection and filtration treatment of the primary treated sewage.

[0093] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "a" or "one" do not indicate a quantity limitation, but indicate that there is at least one. Words such as "including" or "comprising" mean that the elements or objects appearing before "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationships may also change accordingly.

[0094] The above are all the preferred embodiments of this application. Without restricting the protection scope of this application accordingly, therefore: Any equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A medical wastewater environmental treatment device, comprising a physical treatment unit, a chemical treatment unit (11) and a biological treatment unit (12) connected in sequence, characterized in that: The physical processing unit comprises: A processing box (2), the output end of which is connected to the chemical processing unit (11); A filter barrel (3) is rotatably mounted in the treatment box (2), and its rotation axis is parallel to a horizontal plane. The filter barrel (3) has a plurality of filter holes only on its arc-surface outer peripheral wall, and a first opening (31) and a second opening (32) are respectively provided in the middle of both ends. One axial end of the filter barrel (3) is provided with a transparent panel (33), and the first opening (31) is provided on the transparent panel (33); A first ultraviolet lamp (41) is arranged in the processing box (2), and its illumination direction is arranged corresponding to the transparent panel (33); A scraping mechanism is provided in the processing box (2) and is used to scrape off the suspended matter adhering to the inner peripheral wall of the curved surface of the filter barrel (3) when the water level in the filter barrel (3) rises to a set value; a driving mechanism, used for driving the filter barrel (3) to rotate in the processing box (2); and A pre-disinfection tank (5), wherein the input end of the pre-disinfection tank (5) is connected to a wastewater source, and the output end is connected to a water supply pipe (51) whose free end extends from the first opening (31) to the filter barrel (3); the pre-disinfection tank (5) is provided with a chlorine dioxide disinfection system for disinfecting the wastewater in the pre-disinfection tank (5); Wherein, the scraping mechanism comprises: A central axis (61) is coaxially arranged with the filter barrel (3) and one end of which extends from the second opening (32) into the filter barrel (3); A control rod (62) is arranged radially along the filter barrel (3) and is lifted and slidably arranged on the central axis (61), and the control rod (62) is located in the filter barrel (3); A scraper cover (63) is fixedly connected to the upper end of the control rod (62) and is arranged along the axial direction of the filter barrel (3), and one side of the two sides is a high side (631) and the other side is a low side (632), and the rotation direction of the filter barrel (3) is from the low side (632) of the scraper cover (63) to the high side (631) of the scraper cover (63); a slag conveying pipe (64), connected to an end of the slag scraping cover (63) close to the second opening (32) and extending to the outside of the filter barrel (3); and The liquid level assembly is used to monitor the water level in the filter barrel (3) and, when the water level in the filter barrel (3) reaches a set value, drives the control rod (62) to move upward to the high side (631) of the scraper cover (63) to contact the inner circumferential wall of the curved surface of the filter barrel (3).

2. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: The radius of the filter barrel (3) is not less than twice the axial width of the filter barrel (3).

3. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: A filter layer (34) that completely covers all the filter holes is attached to the curved inner wall of the filter barrel (3).

4. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: A plurality of spoiler strips (331) arranged radially along the filter barrel (3) are integrally formed on a side of the transparent panel (33) facing away from the first ultraviolet lamp (41).

5. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: The liquid level assembly comprises: The floating ball (65) is fixedly connected to the bottom end of the control rod (62), and when the high side (631) of the scraper cover (63) contacts the arc-surface inner peripheral wall of the filter barrel (3), the floating ball (65) does not exceed the lowest edge of the first opening (31).

6. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: A guide cylinder (66) is fixedly connected to the central axis (61) and is radially arranged therethrough. The control rod (62) is slidably arranged in the guide cylinder (66). An end of the central axis (61) close to the first opening (31) is fixedly connected to a water retaining plate (67) coaxially arranged with the filter barrel (3). The outer diameter of the water retaining plate (67) is larger than the outer diameter of the second opening (32).

7. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: A hollow portion (611) is provided in the central axis (61), the slag conveying pipe (64) is provided as a hose and passes through the hollow portion (611), and one end of the slag conveying pipe (64) facing away from the slag scraping cover (63) is connected to a negative pressure suction device (68).

8. The medical wastewater environmental protection treatment device according to claim 1 is characterized in that: The bottom of the treatment box (2) is connected to a delivery pipe (21) and a delivery pump (22); the delivery pipe (21) is connected to a transparent spiral coil (23); a second ultraviolet lamp (42) is arranged along the spiral axis of the transparent spiral coil (23) at the center axis (61); the bottom end of the transparent spiral coil (23) is connected to the delivery pipe (21), and the top end is connected to the chemical treatment unit (11).

9. A method for environmentally friendly treatment of medical wastewater, based on the environmentally friendly treatment device for medical wastewater according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The medical wastewater is transported to the pre-disinfection tank (5), and the wastewater is pre-disinfected for a certain period of time by the chlorine dioxide disinfection system to obtain first-stage treated wastewater; S2. The first-stage treated sewage is transported to the filter barrel (3) through the water supply pipe (51), the filter barrel (3) is driven to rotate and the first ultraviolet lamp (41) is turned on, the first-stage treated sewage is filtered to obtain second-stage treated sewage when the filter barrel (3) rotates, and the suspended matter in the first-stage treated sewage adheres to the inner circumferential wall of the curved surface of the filter barrel (3) under the action of centrifugal force; S3. The secondary treated sewage is subjected to secondary disinfection under the irradiation of the first ultraviolet lamp (41) and the residual chlorine dioxide and its by-products are decomposed, and the suspended matter adhering to the inner peripheral wall of the curved surface of the filter barrel (3) is disinfected under the irradiation of the first ultraviolet lamp (41); S4. When there are a lot of suspended matter adhering to the inner circumferential wall of the curved surface of the filter barrel (3) and the sewage level in the filter barrel (3) rises to a set value, the scraping mechanism is activated to scrape off the suspended matter adhering to the inner circumferential wall of the curved surface of the filter barrel (3), thereby promoting the discharge of sewage in the filter barrel (3); S5. The secondary treated wastewater discharged from the filter barrel (3) enters the treatment tank (2) and is sequentially transported to the chemical treatment unit (11) and the biological treatment unit (12) for subsequent treatment.

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