Formic acid wastewater treatment equipment

Abstract

The present application relates to wastewater treatment field, especially to a kind of formic acid wastewater treatment equipment, including vertical scraper, the vertical scraper is installed on the mobile assembly of air floatation tank;It further includes inclined scraper;The inclined scraper is installed at the bottom of the vertical scraper, and the inclined scraper is driven to rotate by motor installed on the vertical scraper;When the dross is scraped, the inclined scraper keeps the state of being inclined to the direction of travel, when the vertical scraper and the inclined scraper complete a dross scraping stroke, the inclined scraper is rotated to be inclined to the other side, then the vertical scraper and the inclined scraper can directly enter next dross scraping stroke;The present application realizes the inclination direction of the inclined scraper to be converted quickly, without the vertical scraper and the inclined scraper being retracted upward to reset, so that the vertical scraper and the inclined scraper can directly continue next dross scraping stroke after completing a dross scraping stroke, to realize the continuity of the dross scraping operation of the vertical scraper and the inclined scraper.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and more particularly to a formic acid wastewater treatment device. Background Technology

[0002] When treating low- to medium-concentration formic acid wastewater, it is necessary to first perform neutralization pretreatment to adjust the pH value to near neutral. This is a necessary condition for subsequent biological treatment or achieving discharge standards. If the wastewater contains colloids, suspended solids, or fine precipitates formed after neutralization, flocculants (such as PAC or PAM) can be added for flocculation and sedimentation or flotation to remove these substances and reduce the load on subsequent treatment.

[0003] In existing flotation tanks, such as the pharmaceutical wastewater treatment device disclosed in Chinese patent CN117361678A, an inclined scraper is designed and connected at an angle below the vertical scraper. The inclined scraper is inserted at an angle below the moving scum, thereby tilting and supporting the moving scum to prevent excessive scum accumulation and sinking. However, it has the following drawbacks:

[0004] 1. After the vertical and inclined scrapers have scraped off the scum once, they need to be retracted upwards and moved back to their original positions before the next scraping of scum can be carried out. This makes it impossible to work continuously and results in low efficiency.

[0005] 2. Scum is easily left on the inclined scraper, and since the vertical scraper and the inclined scraper are not on the same vertical plane, it is not convenient to directly scrape or blow away the scum left on the vertical scraper and the inclined scraper. Summary of the Invention

[0006] In order to overcome the shortcomings of the existing combination of vertical and inclined scrapers in flotation tanks which cannot achieve continuous operation, this invention provides a formic acid wastewater treatment device.

[0007] The technical solution is as follows: a scum removal structure includes a vertical scraper mounted on a movable component on an air flotation tank; it also includes an inclined scraper; an inclined scraper is mounted at the bottom of the vertical scraper, and the inclined scraper is driven to rotate by a motor mounted on the vertical scraper; when scraping scum, the inclined scraper remains inclined in the direction of travel; after the vertical scraper and the inclined scraper have completed one scum removal cycle, the inclined scraper is controlled to rotate to the other side, and then the vertical scraper and the inclined scraper can directly enter the next scum removal cycle.

[0008] To further explain, the inclined scraper has filter holes with a built-in filter screen.

[0009] To further explain, an air blower is installed on the vertical scraper, and the air blower has two strip-shaped air outlets, which are arranged downwards and located on both sides of the vertical scraper.

[0010] To further explain, when the inclined scraper is rotated to a vertical position, the two sides of the inclined scraper are respectively in the same vertical plane as the two sides of the vertical scraper.

[0011] To further explain, a rotating plate is installed on each of the two sides of the vertical scraper. The rotating plate is driven to rotate by a motor installed on the vertical scraper. When the rotating plate flips down to a vertical position, a space is formed between the rotating plate and the vertical scraper to guide the airflow.

[0012] To further explain, the air outlet of the air blower is located between the vertical scraper and the rotating plate.

[0013] To further explain, the filter holes on the inclined scraper are distributed in a matrix.

[0014] To further explain, when the inclined scraper is in an inclined state, the rotating plate rests on the inclined scraper, and the rotating plate divides the scraping surface of the inclined scraper into upper and lower parts.

[0015] To further explain, a connecting block is installed at each end of the vertical scraper, and the vertical scraper is connected to the moving component on the flotation tank through the two connecting blocks.

[0016] A formic acid wastewater treatment device includes an air flotation tank, a movable component is provided on the air flotation tank, and a scum scraping structure is installed on the movable end of the movable component.

[0017] The beneficial effects of this invention are as follows: This invention enables rapid switching of the tilt direction of the inclined scraper, eliminating the need for the vertical scraper and inclined scraper to retract and reset upwards, allowing the vertical scraper and inclined scraper to directly continue to the next scum removal stroke after completing one scum removal stroke, thus achieving continuity in the scum removal operation of the vertical scraper and inclined scraper; and by utilizing the reverse movement of the inclined scraper in the wastewater to backwash the filter holes, thereby maintaining the unobstructed flow of the filter holes.

[0018] This invention enables the inclined scraper to rotate to be in the same vertical plane as the vertical scraper, which facilitates the uniform removal of residual scum. Attached Figure Description

[0019] Figure 1 The diagram shown is a three-dimensional structural schematic of the scum removal structure of the present invention;

[0020] Figure 2 The diagram shows the inclined state of the slanted scraper of the present invention;

[0021] Figure 3 The diagram shows the rotating plate of the present invention in a downward flipped state;

[0022] Figure 4The diagrams show the state diagrams of the rotating plate of the present invention resting against the inclined scraper at different positions;

[0023] Figure 5 The diagram shows the installation state of the connecting block of the present invention.

[0024] In the attached diagram: 1-vertical scraper, 2-slanted scraper, 21-filter hole, 3-air blower, 4-rotating plate, 5-connecting block. Detailed Implementation

[0025] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0026] Example 1: A scum removal structure, such as Figures 1-5 As shown, it includes a vertical scraper 1, which is mounted on a movable component on the flotation tank; it also includes an inclined scraper 2; the inclined scraper 2 is mounted on the bottom of the vertical scraper 1, and the inclined scraper 2 is driven to rotate by a motor mounted on the vertical scraper 1.

[0027] The inclined scraper 2 has filter holes 21, and a filter screen is installed in the filter holes 21.

[0028] An air blower 3 is installed on the vertical scraper 1. The air blower 3 has two air outlets, which are strip-shaped and face downwards, located on both sides of the vertical scraper 1.

[0029] When the inclined scraper 2 is rotated to a vertical position, the two sides of the inclined scraper 2 are respectively in the same vertical plane as the two sides of the vertical scraper 1.

[0030] In this embodiment, scum collection boxes are set at both ends of the flotation tank, and wastewater is injected into the flotation tank. The operation process and principle of the flotation tank are common knowledge and will not be described in detail here (see CN117361678A). The following only describes the scum removal process.

[0031] During the scum removal process, the vertical scraper 1 and the inclined scraper 2 are moved by the moving components on the flotation tank. The vertical scraper 1 and the inclined scraper 2 push the scum into the scum collection box at the end of the flotation tank. The inclined scraper 2 is pre-controlled to rotate in the direction of travel, tilting to support and push the scum, preventing excessive accumulation and settling. When the vertical scraper 1 and the inclined scraper 2 complete one scum removal cycle, they reach the scum collection box at one end of the flotation tank, and the scraped scum falls into the collection box. Once the water level in the scum collection box is stable, the inclined scraper 2 is rotated to tilt to the other side. Then, the moving component on the flotation tank drives the vertical scraper 1 and the inclined scraper 2 to move in opposite directions to perform the next scum scraping stroke. The scum is scraped and sent into the scum collection box at the other end of the flotation tank. In this way, the tilting direction of the inclined scraper 2 can be quickly changed without the vertical scraper 1 and the inclined scraper 2 needing to retract and reset upwards. This allows the vertical scraper 1 and the inclined scraper 2 to continue to the next scum scraping stroke immediately after completing one scum scraping stroke, thus achieving the continuity of the scum scraping operation of the vertical scraper 1 and the inclined scraper 2.

[0032] The filter holes 21 on the inclined scraper 2 can discharge some of the wastewater at the interface between the scum and the wastewater, thereby reducing the resistance generated when the inclined scraper 2 moves. When the inclined scraper 2 switches its tilt direction to perform the next scum scraping stroke, the reverse movement of the inclined scraper 2 in the wastewater can be used to backwash the filter holes 21, thereby keeping the filter holes 21 unobstructed.

[0033] Furthermore, to reduce the residue of scum on the vertical scraper 1 and the inclined scraper 2, an air blower 3 is added. When the vertical scraper 1 and the inclined scraper 2 reach the scum collection box at one end of the flotation tank, after the scraped scum falls into the scum collection box, the inclined scraper 2 is controlled to rotate upward to a horizontal position. The overall height of the vertical scraper 1 and the inclined scraper 2 is adjusted in conjunction with the cylinder in the moving assembly of the flotation tank, allowing the inclined scraper 2 to move out of the flotation tank and reach above the scum collection box. Then, the inclined scraper 2 is controlled to rotate downward to a vertical position. At this point, the two sides of the inclined scraper 2 are respectively on the same vertical plane as the two sides of the vertical scraper 1. Then, start the air blower 3, and blow air downwards from one of the air outlets of the air blower 3 to move the scraping surfaces of the vertical scraper 1 and the inclined scraper 2, blowing away the residual scum on the vertical scraper 1 and the inclined scraper 2 and letting it fall into the scum collection box. When the vertical scraper 1 and the inclined scraper 2 make their next scum scraping stroke and reach the scum collection box at the other end of the flotation tank, control the other air outlet of the air blower 3 to blow air downwards to move the scraping surfaces of the vertical scraper 1 and the inclined scraper 2, so that the inclined scraper 2 can rotate to be in the same vertical plane as the vertical scraper 1, which facilitates the uniform removal of residual scum.

[0034] Example 2: Based on Example 1, as follows Figures 1-5As shown, a rotating plate 4 is installed on each of the two sides of the vertical scraper 1, and the rotating plate 4 is driven to rotate by a motor installed on the vertical scraper 1.

[0035] The air outlet of the air blower 3 is located between the vertical scraper 1 and the rotating plate 4.

[0036] The filter holes 21 on the inclined scraper 2 are distributed in a matrix.

[0037] When the inclined scraper 2 is in an inclined state, the rotating plate 4 rests on the inclined scraper 2, and the rotating plate 4 divides the scraping surface of the inclined scraper 2 into upper and lower parts.

[0038] A connecting block 5 is installed at each end of the vertical scraper 1, and the vertical scraper 1 is connected to the moving component on the flotation tank through the two connecting blocks 5.

[0039] In this embodiment, considering the large distance between the inclined scraper 2 and the air blower 3, the blowing force of the gas from the air blower 3 on the residual scum on the inclined scraper 2 is insufficient. Therefore, a rotating plate 4 is added. Initially, the rotating plate 4 is facing upwards. When the vertical scraper 1 and the inclined scraper 2 are above the scum collection box, and the inclined scraper 2 rotates downwards to a vertical position, the rotating plate 4 on the side where the vertical scraper 1 scrapes the scum is flipped downwards. Figure 3 As shown, a space is formed between the rotating plate 4 and the vertical scraper 1 to guide the airflow, so that the gas blown out from the blower 3 can be gathered in the space between the rotating plate 4 and the vertical scraper 1, thereby increasing the impact force of the gas blown out from the blower 3 at the inclined scraper 2 and improving the blowing effect on the residual scum on the inclined scraper 2.

[0040] Furthermore, after repeated scraping of scum in the wastewater, the amount of scum gradually decreases, or the amount of scum in the wastewater is already small. In this case, it is not necessary for all the inclined scrapers 2 to participate in the inclined bearing and pushing work of the scum. In order to reduce the resistance to movement and improve the effective utilization of energy, the rotating plate 4 on the side of the vertical scraper 1 that scrapes the scum is controlled to flip downwards, and the inclined scraper 2 is flipped upwards for adjustment. Figure 4As shown, the rotating plate 4 rests against the inclined scraper 2, with the resting position of the rotating plate 4 located between two rows of filter holes 21. The rotating plate 4 divides the scraping surface of the inclined scraper 2 into upper and lower parts, and the filter holes 21 on the inclined scraper 2 are also divided into upper and lower parts. The resting position of the rotating plate 4 can be controlled according to the amount of scum in the wastewater, adjusting the proportion of the scraping surface of the inclined scraper 2 being divided. In conjunction with the cylinder in the moving component of the flotation tank, the overall height of the inclined scraper 2 and the rotating plate 4 can be adjusted. At this time, the lower part of the inclined scraper 2 participates in the tilting and bearing of the scum, while the upper part of the inclined scraper 2 is blocked by the rotating plate 4. The rotating plate 4 also replaces the vertical scraper 1 to push the scum, thereby achieving the division of the inclined scraper 2. The proportion of the part of the inclined scraper 2 used can be adjusted according to the amount of scum in the wastewater, avoiding the problem of excessive energy consumption caused by the movement of the excess part of the inclined scraper 2 in the wastewater.

[0041] When cleaning the remaining scum on the rotating plate 4, simply control the rotating plate 4 to rotate downwards quickly, and use centrifugal force to throw off the remaining scum on the rotating plate 4.

[0042] A formic acid wastewater treatment device includes an air flotation tank. A moving component is installed on the air flotation tank, and a scum scraping structure is installed on the moving end of the moving component. The moving component includes a lead screw with a motor, a guide rod, and a cylinder. One connecting block 5 is installed on the lead screw, and another connecting block 5 is installed on the guide rod. The movement of the connecting block 5 is controlled by rotating the lead screw, allowing the scum scraping structure to move laterally. The lifting and lowering of the lead screw and guide rod with the motor is controlled by the cylinder, allowing the scum scraping structure to move vertically and adjust its height.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A scum scraping structure comprising vertical scraping plates (1) mounted on a moving assembly on a flotation tank, characterized in that, Also include inclined scraper (2); The bottom of the vertical scraper (1) is provided with inclined scraper (2), the inclined scraper (2) is driven to rotate by motor installed on the vertical scraper (1);When the floating sludge is scraped, the inclined scraper (2) keeps the state of tilting to the direction of travel, when the vertical scraper (1) and the inclined scraper (2) go through a floating sludge scraping stroke, the inclined scraper (2) is controlled to rotate to the other side, and then the vertical scraper (1) and the inclined scraper (2) can directly enter the next floating sludge scraping stroke; The vertical scraper (1) is provided with a blower (3), and the blower (3) has two strip-shaped air outlets, and the two air outlets are downwardly arranged on the two sides of the vertical scraper (1) respectively; The two side surfaces of the vertical scraper (1) are respectively provided with a rotating plate (4), and the rotating plate (4) is driven to rotate by a motor installed on the vertical scraper (1), when the rotating plate (4) is turned down to the vertical state, the rotating plate (4) and the vertical scraper (1) form a space for guiding air flow; The air outlet of the blower (3) is located between the vertical scraper (1) and the rotating plate (4); When the inclined scraper (2) is in the inclined state, the rotating plate (4) is lapped on the inclined scraper (2), and the scraping surface of the inclined scraper (2) is divided into upper and lower two parts by the rotating plate (4).

2. A scum scraping structure according to claim 1, characterized in that The inclined scraper (2) is provided with filter holes (21) with built-in filter screens.

3. The scum scraping structure according to claim 1, wherein When the inclined scraper (2) is rotated to the vertical state, the two side surfaces of the inclined scraper (2) are respectively located in the same vertical plane with the two side surfaces of the vertical scraper (1).

4. The scum scraping structure according to claim 2, wherein The filter holes (21) on the inclined scraper (2) are distributed in a matrix.

5. The scum scraping structure according to claim 1, wherein The vertical scraper (1) is respectively provided with a connecting block (5) at two ends, and the vertical scraper (1) is connected with a moving assembly on the air flotation tank through the two connecting blocks (5).

6. A formic acid wastewater treatment apparatus characterized by comprising: The air flotation tank is provided with a moving assembly, and the moving end of the moving assembly is provided with a floating sludge scraping structure according to any one of claims 1-5.

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