Wastewater zero discharge treatment control method and device for waste incineration power plant

Abstract

The invention relates to the technical field of sewage treatment, in particular to a waste water zero discharge treatment control method and device for a waste incineration power plant, the waste water zero discharge treatment control device for the waste incineration power plant comprises a flotation tank, and the flotation tank is an annular area. The annular flotation tank is arranged, the water inlet area, the reaction area, the air flotation contact area and the separation area are arranged at intervals from inside to outside, and the straight line where the water flow direction of wastewater flowing into the separation area from the air flotation contact area is located is inclined to the radial line of the flotation tank, so that the wastewater has tangential force after flowing into the separation area; according to the air-flotation slag removal device, waste water in the separation area and scum floating above the liquid level rotate in the circumferential direction at the same time, the scum above the liquid level is thrown into the slag collection area under the action of centrifugal force, therefore, separation of the scum and the waste water is achieved, in the whole air-flotation slag removal process, due to the fact that a scraping plate does not need to be used for scraping the scum, additional machine halt for scum removal is not needed, and the cost is reduced. Therefore, the foam scraping efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method and apparatus for zero-discharge treatment and control of wastewater from a waste incineration power plant. Background Technology

[0002] Wastewater from waste-to-energy plants has a complex and varied composition, with the core pollutants concentrated in landfill leachate. Landfill leachate is a high-concentration organic wastewater produced during the landfilling and incineration process through precipitation, the moisture content of the waste itself, and microbial decomposition.

[0003] In the pretreatment of wastewater mainly composed of landfill leachate, the wastewater is usually first subjected to air flotation treatment to remove some fatty acids, alcohols, organic matter, and inorganic particulate matter from the wastewater.

[0004] During dissolved air flotation (DAF) treatment, wastewater is fed into a DAF tank, where flocculants and coagulants are added. After flocculation, the wastewater enters the DAF contact zone, where microbubbles in the dissolved air water adhere to the flocculated suspended solids and enter the separation zone together. The suspended solids and microbubbles mix and float to the surface, forming scum. The scum is then scraped off into the sludge tank by a skimmer above the DAF tank, while the clear water in the lower layer of the separation zone flows by gravity into the clear water tank through a collection pipe, thus achieving solid-liquid separation.

[0005] However, the above-mentioned air flotation treatment device has the following problems when in use: In order to remove the scum on the liquid surface of the separation zone of the flotation cell, a skimmer device (the core of which is a scraper) needs to be set up to scrape off the scum. As the operation time increases, more and more particulate impurities will be attached to the side of the scraper. In order to prevent the particulate impurities from settling into the separation zone, it is necessary to frequently stop the machine to clean the impurities attached to the side of the scraper. Therefore, it is inevitable that the skimmer efficiency of the flotation treatment device will be reduced. Summary of the Invention

[0006] Therefore, it is necessary to provide a zero-discharge treatment control method and device for wastewater incineration power plants to address the problems existing in current air flotation treatment devices, in order to solve the problem of low skimming efficiency of existing air flotation treatment devices.

[0007] The above objectives are achieved through the following technical solutions: A wastewater zero-discharge treatment control device for a waste incineration power plant, comprising: The flotation tank is annular and is divided into an inlet zone, a reaction zone, an air flotation contact zone, a separation zone, and a sludge collection zone from the inside to the outside along its radial direction. Wastewater can flow in from the inlet area, pass through the reaction zone, the flotation contact zone and the separation zone in sequence, and be discharged from the separation zone; Furthermore, the straight line in which the wastewater flows from the air flotation contact zone into the separation zone is inclined to the diameter of the flotation tank.

[0008] Preferably, the flotation cell is provided with a first annular baffle, a second annular baffle and a third annular baffle at intervals from the inside to the outside along its radial direction. The bottom of the first annular baffle is provided with a first water inlet groove, and the lower part of the third annular baffle is provided with a second water inlet groove at intervals. The extension direction of the second water inlet groove is inclined to the diameter of the flotation cell.

[0009] Preferably, a guide shuttle is slidably disposed in the second water inlet tank, the guide shuttle slides in contact with the tank wall of the second water inlet tank, and the guide shuttle can reciprocate along the extension direction of the second water inlet tank.

[0010] Preferably, a scum scraping assembly is provided on the flotation cell and at the location of the separation zone. The scum scraping assembly is used to guide the scum in the separation zone to move radially from the inside to the outside of the flotation cell.

[0011] Preferably, the slag scraping assembly includes a roller, connecting rods, and scrapers. The roller is rotatably mounted on the flotation cell, and the axis of the roller is configured at an angle to the diameter of the flotation cell. The roller is capable of rotating around its axis. There are multiple connecting rods, which are spaced apart on the outer circumferential surface of the roller. There are multiple scrapers, which are spaced apart around the axis of the roller and connected to the end of the connecting rod away from the roller.

[0012] Preferably, the straight line in the width direction of the scraper is arranged at an angle to the diameter of the roller.

[0013] Preferably, a stirrer, a flocculant additive, and a bubble generator are respectively installed on the flotation tank and in the reaction zone.

[0014] Preferably, a first wall scraping assembly is provided on the flotation cell at the location of the reaction zone and the air flotation contact zone, for scraping off impurities on the peripheral walls of the reaction zone and the air flotation contact zone.

[0015] Preferably, a second wall scraping assembly is provided on the flotation cell and at the location of the separation zone to scrape off impurities on the periphery of the separation zone.

[0016] A method for zero-discharge treatment and control of wastewater from a waste-to-energy plant, using the aforementioned wastewater zero-discharge treatment and control device for waste-to-energy plants, includes the following steps: S100, which introduces wastewater into the inlet area; S200 controls the flow direction of wastewater from the air flotation contact zone into the separation zone, so that the wastewater flows into the separation zone in a direction inclined to the diameter of the flotation tank.

[0017] The beneficial effects of this invention are: This invention features a ring-shaped flotation tank, with the inlet zone, reaction zone, air flotation contact zone, and separation zone arranged at intervals from the inside out. The flow direction of wastewater from the air flotation contact zone into the separation zone is inclined to the radial line of the flotation tank. Therefore, the wastewater experiences tangential force upon entering the separation zone, causing it to rotate circumferentially within the separation zone. This allows the wastewater, along with the scum floating above the liquid surface, to rotate circumferentially simultaneously. Under centrifugal force, the scum above the liquid surface is thrown into the scum collection zone, thus achieving separation of scum and wastewater. Throughout the air flotation scum removal process, since there is no need to use scrapers to remove the scum, there is no need for additional shutdowns for scum cleaning, thereby improving scum removal efficiency. Attached Figure Description

[0018] Figure 1 This is an overall schematic diagram of a wastewater zero-discharge treatment control device for a waste incineration power plant according to the present invention. Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view of AA; Figure 4 for Figure 3 A magnified schematic diagram of the structure at point B in the middle; Figure 5 This is a half-sectional axonometric view of a wastewater zero-discharge treatment control device for a waste incineration power plant according to the present invention. Figure 6 for Figure 5 A magnified schematic diagram of the structure at point C; Figure 7 for Figure 1 Front view; Figure 8 for Figure 7 DD section view; Figure 9 for Figure 8 A magnified schematic diagram of the structure at point E in the middle; Figure 10 This is a schematic diagram of the structure of the first and second scraper components in a wastewater zero-discharge treatment control device for a waste incineration power plant according to the present invention. Figure 11 This is a schematic diagram of the slag scraping assembly in a wastewater zero-discharge treatment control device for a waste incineration power plant according to the present invention.

[0019] in: 100. Flotation tank; 101. Inlet zone; 102. Reaction zone; 103. Air flotation contact zone; 104. Separation zone; 1041. Drain outlet; 105. Sludge collection zone; 1051. Sludge discharge outlet; 110. First annular baffle; 111. First inlet trough; 120. Second annular baffle; 130. Third annular baffle; 131. Second inlet trough; 200. Guide shuttle; 201. Guide surface; 202. Guided surface; 203. Dovetail groove; 204. Dovetail block; 300. Slag scraper assembly; 310. Roller; 320. Connecting rod; 330. Scraper; 340. Support frame; 410. Agitator; 420. Flocculant additive; 430. Bubble generator; 440. Third toothed ring; 441. Rotating support ring; 500, First scraper assembly; 510, First toothed ring; 520, First vertical connecting plate; 530, First horizontal connecting plate; 540, First scraper strip; 600. Second scraper assembly; 610. Second toothed ring; 620. Second vertical connecting plate; 630. Second horizontal connecting plate; 640. Second scraper strip; 700. Trestle; 710. Rotating support block. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0023] like Figures 1 to 11 As shown, a wastewater zero-discharge treatment control device for a waste incineration power plant includes a flotation tank 100. The flotation tank 100 is annular, and its interior is divided into an inlet zone 101, a reaction zone 102, an air flotation contact zone 103, a separation zone 104, and a slag collection zone 105 in sequence from the inside to the outside along its radial direction. Wastewater can flow in from the inlet zone 101, pass through the reaction zone 102, the air flotation contact zone 103, and the separation zone 104 in sequence, and be discharged from the separation zone 104. The straight line in which the wastewater flows from the air flotation contact zone 103 into the separation zone 104 is inclined to the radial line of the flotation tank 100.

[0024] During operation, the wastewater to be treated is introduced into the inlet zone 101. The wastewater sequentially passes through the reaction zone 102, the air flotation contact zone 103, and the separation zone 104, and is discharged from the separation zone 104. During this process, when the wastewater enters the reaction zone 102 from the inlet zone 101, it reacts with the flocculant and coagulant aid in the reaction zone 102 to form flocs. Simultaneously, the flocs come into contact with the microbubbles introduced into the reaction zone 102, forming scum that floats upwards to the surface of the wastewater in the reaction zone 102. At this point, the scum in the upper part of the reaction zone 102 flows with the water flow from the reaction zone 102 into the air flotation contact zone 103. Meanwhile, since the straight line of the wastewater flowing from the air flotation contact zone 103 into the separation zone 104 is inclined to the radial line of the flotation tank 100, the wastewater has a tangential force after flowing into the separation zone 104. Therefore, the wastewater can rotate circumferentially inside the separation zone 104. This causes the wastewater in the separation zone 104 to rotate circumferentially along with the scum floating above the liquid surface. Under the action of centrifugal force, the scum above the liquid surface is thrown into the scum collection zone 105, thereby achieving the separation of scum and wastewater. Since there is no need to use a skimmer to remove scum during the entire air flotation scum removal process, there is no need to stop the machine to clean the scum, which is beneficial to improving skimmer efficiency.

[0025] Understandably, the circumferential rotation of the wastewater in the separation zone 104 also helps to promote the full mixing of flocculants, coagulants, and microbubbles with the wastewater, thereby improving the flotation efficiency and sludge removal quality.

[0026] Furthermore, to facilitate staff observation of the working status within the inlet zone 101, reaction zone 102, air flotation contact zone 103, and separation zone 104, in this embodiment, a trestle 700 is installed on top of the flotation tank 100. The trestle 700 is A-shaped, with its center located at the center of the flotation tank 100. A support column is installed at the center of the inlet zone 101 to support the trestle 700, with its top fixedly connected to the center of the trestle 700. The three ends of the trestle 700 are mounted on the flotation tank 100. This allows staff to climb a ladder to the trestle 700 and observe the working status within the inlet zone 101, reaction zone 102, air flotation contact zone 103, and separation zone 104.

[0027] Furthermore, to ensure that the wastewater in the reaction zone 102 can fully contact and react with the flocculant, coagulant aid, and microbubbles, specifically, an agitator 410, a flocculant additive 420, and a bubble generator 430 are respectively installed on the flotation tank 100 and located in the reaction zone 102. Specifically, a third toothed ring 440 is fixedly connected to the shell of the agitator 410, and a rotating support ring 441 is provided at the upper end of the third toothed ring 440. An annular wedge groove is formed on the upper surface of the rotating support ring 441, and a rotating support block 710 is provided at the lower end of the trestle 700. The rotating support block 710 is an arc-shaped wedge block, and the rotating support block 710 is slidably set in the annular wedge groove. The lower end of the trestle 700 is also equipped with a motor, and the output shaft of the motor is fixedly connected to a gear. The gear meshes with the third gear ring 440. The flocculant adder 420 is set on the housing part of the agitator 410 and is used to add flocculant and coagulant aid to the wastewater in the reaction zone 102 during the operation of the agitator 410. The bubble generator 430 is set at the lower part of the agitator shaft of the agitator 410 and is used to fill the wastewater in the lower layer of the reaction zone 102 with microbubbles.

[0028] When in use, the motor is started, and the output shaft of the motor drives the gear to rotate. The gear drives the third gear ring 440 to rotate, and the third gear ring 440 drives the housing part of the agitator 410 to rotate together. At the same time, the agitator 410 is started, and its agitator shaft rotates circumferentially. At this time, the agitator shaft of the agitator 410 rotates and revolves relative to the wastewater in the reaction zone 102 to promote the full contact and reaction of wastewater, flocculant and coagulant aid, as well as to promote the contact between microbubbles and flocculants.

[0029] In a further embodiment, such as Figures 1-3 and Figure 9As shown, the flotation cell 100 is provided with a first annular baffle 110, a second annular baffle 120 and a third annular baffle 130 arranged radially from the inside to the outside. The bottom of the first annular baffle 110 is provided with a first water inlet trough 111, and the lower part of the third annular baffle 130 is provided with a second water inlet trough 131. The extension direction of the second water inlet trough 131 is inclined to the radial line of the flotation cell 100.

[0030] During operation, wastewater in the inlet zone 101 enters the reaction zone 102 through the first inlet tank 111. Once the wastewater level in the reaction zone 102 exceeds the height of the upper end face of the second annular baffle 120, the scum on the surface of the reaction zone 102, along with some wastewater, passes over the second annular baffle 120 and enters the air flotation contact zone 103. Since the extension direction of the second inlet tank 131 is inclined to the diameter of the flotation tank 100, the wastewater in the air flotation contact zone 103 has a tangential force when it flows into the separation zone 104 through the second inlet tank 131, so that the wastewater entering the separation zone 104 can rotate circumferentially. At the same time, since the wastewater in the air flotation contact zone 103 enters the separation zone 104 through the second inlet tank 131, the scum floating on the surface of the air flotation contact zone 103 can pass over the upper surface of the third annular baffle 130 from the air flotation contact zone 103 and enter the separation zone 104.

[0031] Furthermore, to facilitate the discharge of wastewater from the separation zone 104, a drain outlet 1041 can be opened on the outer surface of the flotation tank 100, located in the separation zone 104. Similarly, to facilitate the discharge of scum and some wastewater from the scum collection zone 105, a scum discharge outlet 1051 can be opened on the outer surface of the flotation tank 100, located in the scum collection zone 105. Furthermore, to prevent the accumulation of scum and wastewater in the scum collection zone 105, the lower surface of the scum collection zone 105 is sloped, and the side where the scum discharge outlet 1051 is located is the lowest surface.

[0032] Furthermore, the first inlet tank 111 is an annular tank, and the upper end of the first annular baffle 110 is disposed on the lower surface of the trestle 700. In other embodiments, the lower end of the first annular baffle 110 is disposed at the bottom of the flotation tank 100, in which case the first inlet tank 111 is a plurality of circumferentially spaced arc-shaped tanks.

[0033] Understandably, as the flow time in the second inlet tank 131 increases, some particulate impurities settled in the wastewater will adhere to the tank wall of the second inlet tank 131, reducing the flow area of ​​the second inlet tank 131. This reduces the tangential force of the wastewater flowing into the separation zone 104 through the second inlet tank 131, resulting in insufficient centrifugal force to push the scum on the liquid surface of the separation zone 104 into the scum collection zone 105. To solve this problem, such as... Figure 6 , Figure 8 and Figure 9As shown, in a further embodiment, a guide shuttle 200 is slidably disposed in the second water inlet tank 131. The guide shuttle 200 slides in contact with the tank wall of the second water inlet tank 131, and the guide shuttle 200 can reciprocate along the extension direction of the second water inlet tank 131.

[0034] During operation, the guide shuttle 200 slides back and forth along the wall of the second inlet tank 131. Since the guide shuttle 200 is in sliding contact with the wall of the second inlet tank 131, the reciprocating movement of the guide shuttle 200 can scrape off the particulate impurities adhering to the wall of the second inlet tank 131. In addition, the wastewater flowing from the air flotation contact area 103 into the separation area 104 through the second inlet tank 131 can also rinse the guide shuttle 200 and peel off the particulate impurities adhering to the surface of the guide shuttle 200.

[0035] Furthermore, to increase the tangential force of the wastewater flowing into the separation zone 104 through the second inlet tank 131, a guide surface 201 is provided on the guide shuttle 200 on the side facing the wastewater. The slope of the guide surface 201 is greater than the slope of the straight line extending from the second inlet tank 131. This results in a greater tangential force when the wastewater flows into the separation zone 104 under the guidance of the guide surface 201.

[0036] Furthermore, in order to limit the sliding movement of the guide shuttle 200, a dovetail block 204 is provided on the upper surface of the guide shuttle 200, and a matching dovetail groove 203 is provided on the upper top surface of the second water inlet trough 131. Both the dovetail block 204 and the dovetail groove 203 are matching arc shapes. A dovetail groove 203 is provided on the lower surface of the guide shuttle 200, and a matching dovetail block 204 is also provided on the lower bottom surface of the second water inlet trough 131. The dovetail groove 203 is slidably connected to the corresponding dovetail block 204 to limit the sliding movement of the guide shuttle 200, so that the guide shuttle 200 can slide back and forth along the second water inlet trough 131.

[0037] Furthermore, in order to drive the guide shuttle 200 to slide back and forth along the second water inlet trough 131, a driving element can be provided in the separation zone 104, so that the power end of the driving element is connected to the guide shuttle 200 to pull the guide shuttle 200 to slide back and forth along the second water inlet trough 131.

[0038] To increase the centrifugal force when wastewater flows into the separation zone 104, a second water inlet trough 131 is provided circumferentially at equal intervals on the outer circumferential surface of the third annular partition 130. Correspondingly, a guide shuttle 200 is slidably connected in each second water inlet trough 131, and multiple guide shuttles 200 can slide back and forth along the second water inlet trough 131.

[0039] In a further embodiment, such as Figure 2 , Figure 3 and Figure 8As shown, a scum scraping assembly 300 is provided on the flotation tank 100 and at the location of the separation zone 104. The scum scraping assembly 300 is used to guide the scum in the separation zone 104 to move from the inside to the outside along the radial direction of the flotation tank 100.

[0040] A scum scraping assembly 300 is provided to guide the scum in the separation zone 104 to move radially outward along the flotation tank 100, thereby accelerating the entry of the scum in the separation zone 104 into the scum collection zone 105.

[0041] Furthermore, the slag scraping assembly 300 includes a roller 310, which is rotatably mounted on the flotation cell 100 and is capable of rotating about its axis. The axis of the roller 310 is configured at an angle to the radial line of the flotation cell 100.

[0042] Since the axis of roller 310 is arranged at an angle to the diameter of flotation cell 100, when the wastewater and scum in separation zone 104 rotate circumferentially in separation zone 104 to contact roller 310, they can move from separation zone 104 to scum collection zone 105 along the axis of roller 310 under the guidance of roller 310, thereby accelerating the scum into scum collection zone 105. Since roller 310 rotates circumferentially around its axis, compared to roller 310 being fixedly connected to flotation cell 100, by making roller 310 rotate around its axis, wastewater can be used to clean roller 310, preventing excessive particulate impurities from adhering locally on roller 310.

[0043] Specifically, to support the roller 310, a support frame 340 is provided at the lower part of the bridge 700, and the support frame 340 is rotatably connected to both ends of the roller 310. To drive the roller 310 to rotate around its axis, a motor is provided at the lower part of the bridge 700, a drive pulley is provided at the output end of the motor, and a driven pulley is provided at one end of the roller 310. The drive pulley and the driven pulley are connected by a belt.

[0044] In a further embodiment, such as Figure 11 As shown, the slag scraping assembly 300 also includes connecting rods 320 and scrapers 330. There are multiple connecting rods 320, which are spaced apart on the outer circumferential surface of the roller 310. There are multiple scrapers 330, which are spaced apart around the axis of the roller 310, and the scraper 330 is connected to the end of the connecting rod 320 away from the roller 310. The straight line in the width direction of the scraper 330 is arranged at an angle to the radial line of the roller 310.

[0045] By arranging the width direction of the scraper 330 at an angle to the diameter of the roller 310, when the scraper 330 rotates with the roller 310 and faces the rotating scum, the scum is guided upward by the scraper 330, preventing the scum from directly washing against the scraper 330 and breaking it, thus causing the particles in the scum to settle back into the wastewater. In addition, as the roller 310 rotates, the scraper 330 can also be intermittently submerged in the wastewater for self-cleaning, thereby preventing a large amount of particulate impurities from adhering to the surface of the scraper 330.

[0046] In a further embodiment, such as Figure 2 and Figure 10 As shown, a first wall scraping assembly 500 is provided on the flotation tank 100 at the location of the reaction zone 102 and the air flotation contact zone 103, for scraping off impurities on the periphery of the reaction zone 102 and the air flotation contact zone 103.

[0047] Specifically, the first scraping assembly 500 includes a first toothed ring 510, a first vertical connecting plate 520, a first horizontal connecting plate 530, and a first scraper 540. The first toothed ring 510 is rotatably mounted on the trestle 700. The connection method between the first toothed ring 510 and the trestle 700 is the same as the rotational connection method between the second toothed ring 610 and the trestle 700. There are multiple first vertical connecting plates 520, which are arranged radially at intervals along the flotation cell 100. There are multiple first horizontal connecting plates 530, which are respectively connected between two adjacent first vertical connecting plates 520. The first scraper 540 is disposed on the corresponding side of the first vertical connecting plate 520, and the multiple first scraper 540 are in rotational contact with the outer peripheral wall of the first annular partition 110, the inner peripheral wall and outer peripheral wall of the second annular partition 120, and the inner peripheral wall of the third annular partition 130.

[0048] Furthermore, to drive the first gear ring 510 to rotate circumferentially, a motor is installed on the trestle 700. The output shaft of the motor is fixedly connected to a drive gear, which meshes with the first gear ring 510. Thus, the rotation of the motor drives the first gear ring 510 to rotate. The rotation of the first gear ring 510 drives the first vertical connecting plate 520, the first horizontal connecting plate 530, and the first scraper 540 to rotate. This scrapes the particulate impurities attached to the outer peripheral wall of the first annular partition 110, the inner peripheral wall and outer peripheral wall of the second annular partition 120, and the inner peripheral wall of the third annular partition 130 into the wastewater, so that the particulate impurities can contact and react with flocculants, coagulants, and microbubbles to form scum.

[0049] In a further embodiment, such as Figure 2 and Figure 10As shown, a second wall scraping assembly 600 is provided on the flotation cell 100 at the location of the separation zone 104, for scraping off impurities on the periphery of the separation zone 104.

[0050] Specifically, the second scraper assembly 600 includes a second toothed ring 610, a second vertical connecting plate 620, a second horizontal connecting plate 630, and a second scraper 640. The second toothed ring 610 is rotatably mounted on the trestle 700. The connection method between the second toothed ring 610 and the trestle 700 is the same as the rotational connection method between the second toothed ring 610 and the trestle 700. There are two second vertical connecting plates 620, which are arranged radially at intervals along the flotation cell 100. The second horizontal connecting plate 630 is connected between the two second vertical connecting plates 620. The second scraper 640 is mounted on the second vertical connecting plate 620, and the second scraper 640 slides in contact with the outer peripheral wall of the third annular partition 130 and the inner peripheral wall of the flotation cell 100, respectively.

[0051] Furthermore, to drive the second gear ring 610 to rotate circumferentially, a motor is installed on the trestle 700. The output shaft of the motor is fixedly connected to a drive gear, which meshes with the second gear ring 610. Thus, the rotation of the motor drives the second gear ring 610 to rotate, and the rotation of the second gear ring 610 drives the second gear ring 610, the second vertical connecting plate 620, and the second horizontal connecting plate 630 to rotate, thereby scraping off the impurities attached to the outer peripheral wall of the third annular partition 130 and the inner peripheral wall of the flotation cell 100.

[0052] In a further embodiment, the first scraper assembly 500 and the second scraper assembly 600 are configured to alternately slide in cooperation with the first scraper assembly 500 or the second scraper assembly 600.

[0053] When the guide shuttle 200 is engaged with the first wall scraping assembly 500, the first wall scraping assembly 500 drives the guide shuttle 200 to move outward along the second water inlet trough 131. When the guide shuttle 200 is engaged with the second wall scraping assembly 600, the second wall scraping assembly 600 drives the guide shuttle 200 to move inward along the second water inlet trough 131, thereby realizing the reciprocating movement of the guide shuttle 200 along the second water inlet trough 131, so that no additional power element is required.

[0054] Specifically, when the first scraper 540, which is in sliding contact with the inner peripheral wall of the third annular partition 130, rotates to contact the guide shuttle 200, the first scraper 540 pushes the guide shuttle 200 to slide outward along the second water inlet groove 131. When the second scraper 640, which is in sliding contact with the outer peripheral wall of the third annular partition 130, rotates to connect with the guide shuttle 200, the second scraper 640 pushes the guide shuttle 200 to move inward along the second water inlet groove 131. In this way, by alternating the cooperation between the first scraper 540 and the second scraper 640 and the guide shuttle 200, the guide shuttle 200 can slide back and forth along the second water inlet groove 131.

[0055] Furthermore, to facilitate the first scraper 540 in pushing the guide shuttle 200 outward along the second water inlet trough 131, a guide surface 202 is provided on the side of the guide shuttle 200 away from the guide surface 201. When the first scraper 540 rotates to connect with the guide surface 202, the guide shuttle 200 is pushed outward along the second water inlet trough 131 through the guide surface 202, thereby preventing the guide shuttle 200 from being stuck and unable to move.

[0056] A method for zero-discharge treatment and control of wastewater from a waste-to-energy plant, using the aforementioned wastewater zero-discharge treatment and control device for waste-to-energy plants, includes the following steps: S100, the wastewater is introduced into the inlet area 101; S200 controls the flow direction of wastewater from the air flotation contact zone 103 into the separation zone 104, so that the wastewater flows into the separation zone 104 in a direction inclined to the radial line of the flotation tank 100.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A wastewater zero-discharge treatment control device for a waste incineration power plant, characterized in that, include: The flotation tank is annular, and its interior is divided into an inlet zone, a reaction zone, an air flotation contact zone, a separation zone, and a sludge collection zone from the inside out along its radial direction. Wastewater can flow in from the inlet area, pass through the reaction zone, the flotation contact zone and the separation zone in sequence, and be discharged from the separation zone; Furthermore, the straight line in which the wastewater flows from the air flotation contact zone into the separation zone is inclined to the diameter of the flotation tank.

2. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 1, characterized in that, The flotation cell is provided with a first annular baffle, a second annular baffle and a third annular baffle at intervals from the inside to the outside along its radial direction. The bottom of the first annular baffle is provided with a first water inlet groove, and the lower part of the third annular baffle is provided with a second water inlet groove at intervals. The extension direction of the second water inlet groove is inclined to the diameter of the flotation cell.

3. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 2, characterized in that, A guide shuttle is slidably installed in the second water inlet tank. The guide shuttle slides in contact with the tank wall of the second water inlet tank and can reciprocate along the extension direction of the second water inlet tank.

4. A wastewater zero-discharge treatment and control device for a waste incineration power plant according to claim 1 or 3, characterized in that, A scum scraping assembly is provided on the flotation cell and in the separation zone. The scum scraping assembly is used to guide the scum in the separation zone to move radially from the inside to the outside of the flotation cell.

5. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 4, characterized in that, The scraping assembly includes a roller, which is rotatably mounted on the flotation cell, with the axis of the roller at an angle to the diameter of the flotation cell, and the roller is capable of rotating about its axis.

6. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 5, characterized in that, The slag scraping assembly also includes connecting rods and scrapers. There are multiple connecting rods, which are spaced apart on the outer circumference of the roller. There are multiple scrapers, which are spaced apart around the axis of the roller and connected to the end of the connecting rod away from the roller. The line in the width direction of the scraper is arranged at an angle to the diameter of the roller.

7. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 2, characterized in that, A stirrer, a flocculant additive, and a bubble generator are respectively installed on the flotation tank and in the reaction zone.

8. The wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 2, characterized in that, A first wall scraping assembly is provided on the flotation cell at the location of the reaction zone and the air flotation contact zone, for scraping off impurities on the periphery of the reaction zone and the air flotation contact zone.

9. A wastewater zero-discharge treatment control device for a waste incineration power plant according to claim 2, characterized in that, A second wall scraping assembly is provided on the flotation cell and at the location of the separation zone to scrape off impurities on the periphery of the separation zone.

10. A method for controlling zero-discharge wastewater treatment in a waste-to-energy plant, comprising using the wastewater zero-discharge treatment control device for a waste-to-energy plant as described in any one of claims 1-9, characterized in that, Includes the following steps: S100, which introduces wastewater into the inlet area; S200 controls the flow direction of wastewater from the air flotation contact zone into the separation zone, so that the wastewater flows into the separation zone in a direction inclined to the diameter of the flotation tank.

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