Chromium removal device for chromium-containing wastewater

Abstract

The utility model discloses a chromium removal device for chromium-containing wastewater, which comprises a wastewater adjusting tank, the wastewater adjusting tank is connected with a wastewater conditioning tank, the wastewater conditioning tank is connected with a wastewater treatment tank, and the wastewater conditioning tank is divided into a PH adjusting cavity and a reduction reaction cavity through a baffle; a rotary dosing device is arranged in the reduction reaction cavity; the wastewater treatment box is divided into three stages of precipitation cavities through a second-stage baffle and a second-stage blocking frame, the second-stage blocking frame is provided with a first-stage water suction pump for pumping wastewater of the second-stage precipitation cavity to a high-density filter screen of the third-stage precipitation cavity, and the second-stage precipitation cavity and the third-stage precipitation cavity are each provided with a precipitation box; the PH adjusting cavity, the reduction reaction cavity, the primary precipitation cavity and the secondary precipitation cavity are all connected with corresponding agent tanks. Through the components, precipitates can be gathered, so that the precipitates are easier to clean, and the medicament adding tank is matched with the rotary medicament adding device, so that the medicament can be uniformly dispersed in the reaction cavity, and the reaction rate of the medicament is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to wastewater treatment technical field, especially a kind of chromium removal device of chromium-containing wastewater. BACKGROUND

[0002] The existing commonly used treatment method is chemical reduction method, i.e. under acidic conditions, hexavalent chromium is converted into trivalent chromium through oxidation-reduction reaction, then the solution is adjusted to alkaline, trivalent chromium is converted into chromium hydroxide precipitate, and the chromium hydroxide is removed through flocculation and precipitation. When adding reagent, the way of reagent addition directly affects the reaction rate. For example, a chromium-containing wastewater treatment device disclosed in Chinese patent with application number CN202421174685.7 removes the generated precipitate through the sedimentation method through the sludge discharge pipe during the treatment process, which is relatively slow. Moreover, the reagent is added through the reagent adding valve, which is fixed in position, so that the reagent is added at one place, thereby affecting the reaction rate. SUMMARY

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art, and provide a chromium removal device for chromium-containing wastewater, which can add reagent in a wide range and uniformly dispersed manner through the rotating reagent adding device, so as to increase the contact area between the reagent and the reaction solution, thereby increasing the reaction rate.

[0004] This utility model also provides a chromium removal device for chromium-containing wastewater, comprising: a wastewater equalization tank, wherein the wastewater equalization tank is fixedly connected to a wastewater conditioning tank via a pipeline, the wastewater conditioning tank is fixedly connected to a wastewater treatment tank via a pipeline, the wastewater conditioning tank is provided with a primary baffle in the middle, the primary baffle dividing the wastewater conditioning tank into a pH adjustment chamber and a reduction reaction chamber, a secondary baffle is fixedly connected to the upper inner wall of the wastewater treatment tank, and a secondary baffle is fixedly connected to the lower inner wall of the wastewater treatment tank, the secondary baffle and the secondary baffle dividing the wastewater treatment tank into a primary sedimentation chamber, a secondary sedimentation chamber and a tertiary sedimentation chamber, and all pipelines are connected to pumps; a reduction reaction chamber, wherein a rotary dosing agent device is provided inside the reduction reaction chamber, the rotary dosing agent device including... The system includes a motor protective housing, inside which a reversible motor is fixedly connected. A base is threaded onto the lower surface of the motor protective housing. A main shaft is fixedly connected to the output end of the reversible motor. An outer shell and an inner cylinder are rotatably connected to the side surface of the main shaft. The inner cylinder and outer shell are connected via a guide pipe. A drug inlet hopper is fixedly connected to the upper surface of the outer shell. A rotating blade is fixedly connected to the middle of the guide pipe via a connecting rod. A secondary baffle is also included, with a first-stage water pump fixedly connected to its upper surface. The input end of the first-stage water pump is fixedly connected to the depth of the secondary sedimentation chamber via a pipe. A high-density filter screen is installed on the inner wall of the tertiary sedimentation chamber. The output end of the first-stage water pump is fixedly connected to the surface of the high-density filter screen via a pipe. These components allow for gradual reaction and sedimentation, thereby improving the utilization rate of the reaction reagents, significantly reducing the chromium ion content in the wastewater, and ensuring uniform and dispersed addition of the reagents by rotating the reagent addition device, thus accelerating the reaction rate.

[0005] According to the chromium removal device for chromium-containing wastewater described in this utility model, a primary filter screen is fixedly connected to the inner wall of the wastewater equalization tank, and a chromium wastewater inlet is fixedly connected to the upper surface of the wastewater equalization tank via a pipe. These components can preliminarily filter suspended solids, particulate matter, and other impurities from the chromium wastewater.

[0006] According to the chromium removal device for chromium-containing wastewater described in this utility model, the pH adjustment chamber, reduction reaction chamber, and primary sedimentation chamber are all equipped with stirring devices. Each stirring device includes a motor, with a stirring rod fixedly connected to the output end of the motor, and stirring blades fixedly connected to the side surface of the stirring rod. These components allow the reactants to be evenly distributed within the reaction vessel, increasing the reaction rate.

[0007] According to the chromium removal device for chromium-containing wastewater described in this utility model, an acid tank is fixedly connected to the surface of the pH adjustment chamber via a connecting pipe; a reduction tank is fixedly connected to the surface of the reduction reaction chamber via a connecting pipe; a hydroxide tank is fixedly connected to the upper surface of the primary sedimentation chamber via a connecting pipe; and a flocculant tank is fixedly connected to the upper surface of the secondary sedimentation chamber via a connecting pipe. All connecting pipes are connected to pumps. Through these components, the required reagents can be accurately added to each chamber.

[0008] According to the chromium removal device for chromium-containing wastewater described in this utility model, a straight sediment scraper is slidably connected to the lower inner wall of the secondary sedimentation chamber, a secondary sediment tank is fixedly connected to the lower side wall of the secondary sedimentation chamber, and a straight linear motor is fixedly connected to the straight sediment scraper. These components allow sediment to accumulate, making it easier to clean.

[0009] According to the present invention, a chromium removal device for chromium-containing wastewater comprises a filter tank fixedly connected to the lower surface of a high-density filter screen, a drain outlet fixedly connected to the inside of the filter tank via a pipe, a trapezoidal sediment scraper slidably connected to the upper surface of the high-density filter screen, a side wall of the filter tank fixedly connected to the side wall of a three-stage sedimentation tank, and a trapezoidal linear motor fixedly connected to the trapezoidal sediment scraper. These components can filter out extremely small sediments, thereby enabling the wastewater to meet discharge standards.

[0010] Beneficial effects: The above components can collect the precipitate, making it easier to clean. In addition, the reagent addition tank, in conjunction with the rotating reagent addition device, can make the reagent evenly dispersed in the reaction chamber, thereby improving the reagent reaction rate. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0012] Figure 1 This is an overall structural diagram of the chromium removal device for chromium-containing wastewater according to this utility model;

[0013] Figure 2 This is a cross-sectional view of the overall structure of the chromium removal device for chromium-containing wastewater according to this utility model;

[0014] Figure 3 This is a cross-sectional view of the wastewater conditioning tank of the chromium removal device for chromium-containing wastewater of this utility model;

[0015] Figure 4 This is a top view of the wastewater treatment tank of the chromium removal device for chromium-containing wastewater according to this utility model;

[0016] Figure 5 This is a cross-sectional view of the rotary reagent addition device of the chromium removal device for chromium-containing wastewater of this utility model;

[0017] Figure 6 This is an overall structural diagram of the rotary reagent addition device for the chromium removal device for chromium-containing wastewater of this utility model.

[0018] Legend:

[0019] 1. Chromium wastewater inlet; 2. Wastewater equalization tank; 3. Primary filter screen; 4. Wastewater conditioning tank; 5. pH adjustment chamber; 6. Acid tank; 7. First-stage baffle; 8. Reduction reaction chamber; 9. Reduction tank; 10. Rotary reagent dosing device; 11. Chemical feed hopper; 12. Main shaft; 13. Outer casing; 14. Guide pipe; 15. Inner cylinder; 16. Reversible motor; 17. Motor protective casing; 18. Base; 19. Rotating blades; 20. Wastewater treatment tank; 21. 21. Secondary baffle; 22. Secondary barrier; 23. Primary sedimentation chamber; 24. Secondary sedimentation chamber; 25. Tertiary sedimentation chamber; 26. Hydroxide tank; 27. Flocculant tank; 28. Primary water pump; 29. ​​High-density filter screen; 30. Filter water tank; 31. Drain outlet; 32. Straight sediment scraper; 33. Secondary sedimentation tank; 34. Trapezoidal sediment scraper; 35. Tertiary sedimentation tank; 36. Straight linear motor; 37. Trapezoidal linear motor. Detailed Implementation

[0020] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0021] Reference Figures 1-6This utility model discloses a chromium removal device for chromium-containing wastewater, comprising: a wastewater conditioning tank 2 for wastewater pretreatment; a primary filter screen 3 fixedly connected to the inner wall of the wastewater conditioning tank 2 to filter impurities in the wastewater; a wastewater conditioning tank 4 fixedly connected to the wastewater conditioning tank 2 via a pipe for wastewater conditioning to convert hexavalent chromium to trivalent chromium; a primary baffle 7 in the middle of the wastewater conditioning tank 4 to divide the wastewater conditioning tank 4 into a pH adjustment chamber 5 to adjust the pH of the wastewater to ensure the conditions for subsequent reactions, and a reduction reaction chamber 8 to reduce hexavalent chromium to trivalent chromium; an acid tank 6 fixedly connected to the surface of the pH adjustment chamber 5 via a connecting pipe to store acidic reagents; and a reduction tank 9 connected to the surface of the reduction reaction chamber 8 via a connecting pipe to store reducing agents. Wastewater conditioning tank 4 is fixedly connected to wastewater treatment tank 20 via pipes. During wastewater treatment, trivalent chromium precipitates as a sediment. A secondary baffle 21 is fixedly connected to the inner wall of wastewater treatment tank 20, dividing the wastewater treatment tank. A secondary baffle 22 is fixedly connected to the inner wall of wastewater treatment tank 20 to intercept large particles of sediment. The secondary baffle 21 and secondary baffle 22 divide wastewater treatment tank 20 into a primary sedimentation chamber 23, a secondary sedimentation chamber 24, and a tertiary sedimentation chamber 25, allowing for step-by-step sedimentation and effectively removing chromium ions from the wastewater. A hydroxide tank 26 is fixedly connected to the surface of the primary sedimentation chamber 23 via a connecting pipe to store hydroxide. A flocculant tank 27 is fixedly connected to the surface of the secondary sedimentation chamber 24 via a connecting pipe to store flocculant. 4. A straight sediment scraper 32 is slidably connected to the lower inner wall of the secondary sedimentation chamber 24 to scrape the generated sediment into the sedimentation tank. A secondary sedimentation tank 33 is fixedly connected to the lower side wall of the secondary sedimentation chamber 24 to store the sediment. A straight linear motor 36 is fixedly connected to the straight sediment scraper 32 to provide the power for reciprocating motion, enabling the straight sediment scraper 32 to reciprocate. The pipes and connecting pipes are all connected to pumps. The pH adjustment chamber 5, the reduction reaction chamber 8, and the primary sedimentation chamber 25 are all equipped with stirring devices to ensure that the reagents are in full contact with the wastewater. The stirring device includes a motor to provide electricity. The output of the motor is fixedly connected to the stirring rod to transmit power. The side surface of the stirring rod is fixedly connected to the stirring blades to stir the reagents and wastewater.

[0022] After being filtered in wastewater equalization tank 2, the wastewater is transported to pH adjustment chamber 5 via pipeline. Acid tank 6 adds acidic reagent to pH adjustment chamber 5 via connecting pipe to adjust the pH of the wastewater to acidic. The wastewater then enters reduction reaction chamber 8, where reduction tank 9 adds reducing agent via connecting pipe to reduce hexavalent chromium to trivalent chromium. The wastewater is then transported to primary sedimentation chamber 23 via pipeline. Hydroxide tank 26 adds hydroxide to primary sedimentation chamber 23 via connecting pipe to form chromium hydroxide precipitate from trivalent chromium. The wastewater and chromium hydroxide precipitate then enter secondary sedimentation chamber 24. Flocculant tank 27 adds flocculant to secondary sedimentation chamber 24 via connecting pipe to agglomerate the chromium hydroxide precipitate. All pipelines and connecting pipes are connected to pumps. After the wastewater is discharged, linear motor 36 scrapes the precipitate to secondary sedimentation tank 33 via flat precipitate scraper 32.

[0023] The reduction reaction chamber 8 is equipped with a rotary reagent addition device 10, which allows for uniform addition of reagents, improving reagent utilization and reaction rate. The rotary reagent addition device 10 includes a motor protective shell 17 to protect the motor from acid corrosion. A reversible motor 16 is fixedly connected inside the motor protective shell 17, and its forward and reverse motion prevents reagent residue. A base 18 is threadedly connected to the lower surface of the motor protective shell 17 to improve the stability of the device. A main shaft 12 is fixedly connected to the output end of the reversible motor 16 to support the operation and transmit power. An outer shell 13 is rotatably connected to the side surface of the main shaft 12 to protect the inner cylinder and inner cylinder 15, where the reagent is temporarily stored. The inner cylinder 15 and the outer shell 13 are connected by a guide pipe 14 to guide the reagent in the inner cylinder to the outer shell. A drug inlet hopper 11 is fixedly connected to the upper surface of the outer shell 13 for adding reagents. A rotating blade 19 is fixedly connected to the middle of the guide pipe 14 through a connecting rod to cut the reagent and make it more dispersed.

[0024] After the medicine enters from the medicine inlet 11, the reversible motor 16 is started. The reversible motor 16 drives the main shaft 12 to rotate forward. The main shaft 12 drives the inner cylinder 15 and the outer shell 13 to rotate, and drives the rotating blade 19 to rotate through the connecting rod. The medicine is thrown from the inner cylinder 15 through the guide pipe 14 to the rotating blade 19 in the middle of the outer shell 13. The rotating blade 19 cuts the medicine and disperses it.

[0025] The secondary filter 22 intercepts large particles of sediment. A first-stage pump 28 is fixedly connected to the upper surface of the secondary filter 22 to pump the settled wastewater to the next sedimentation chamber. The input end of the first-stage pump 28 is fixedly connected to the depth of the secondary sedimentation chamber 24 through a pipe, causing the sediment to aggregate through flocculation. A high-density filter screen 29 is installed on the inner wall of the tertiary sedimentation chamber 25 to filter the last remaining sediment. The output end of the first-stage pump 28 is fixedly connected to the surface of the high-density filter screen 29 through a pipe. A filter water filter is fixedly connected to the lower surface of the high-density filter screen 29. The filter tank 30 temporarily stores filtered wastewater that meets the standards. The filter tank 30 is fixedly connected to a drain outlet 31 through a pipe to discharge the qualified wastewater. A trapezoidal sediment scraper 34 is slidably connected to the upper surface of the high-density filter screen 29 to scrape the generated sediment into the sediment tank. The side wall of the filter tank 30 is fixedly connected to the side wall of the three-stage sediment tank 35 to store sediment. A trapezoidal linear motor 37 is fixedly connected to the trapezoidal sediment scraper 34 to provide the power for reciprocating motion, so that the trapezoidal sediment scraper 34 can achieve reciprocating motion.

[0026] After the secondary barrier 22 intercepts large particles of sediment, the sedimented wastewater is pumped to the surface of the high-density filter screen 29 by the first-stage pump 28 to filter out the small sediments and enter the filter tank 30. Then the qualified wastewater is discharged. After the wastewater is discharged, the trapezoidal linear motor 37 scrapes the sediment to the tertiary sediment tank 35 through the trapezoidal sediment scraper 34.

[0027] Working principle: During operation, chromium wastewater first enters wastewater equalization tank 2, then enters pH adjustment chamber 5. Acidic reagent is added to pH adjustment chamber 5 via acid tank 6 to adjust the pH value to 2-3. The wastewater with pH 2-3 then enters reduction reaction chamber 8, where reducing agent from reduction tank 9 is added via a rotary dosing device to reduce hexavalent chromium to trivalent chromium. The trivalent chromium wastewater then enters primary sedimentation chamber 23, where hydroxide is added via hydroxide tank 26 to adjust the pH to 8-9, forming chromium hydroxide precipitate. The wastewater and precipitate then pass through secondary baffle 21 into secondary sedimentation chamber 24, where flocculant is added via flocculant tank 27. Finally, the wastewater passes through the primary sedimentation chamber... Pump 28 pumps the settled wastewater from the secondary sedimentation chamber 24 to the surface of the high-density filter screen 29 in the tertiary sedimentation chamber 25. The wastewater then enters the filter tank 30 through the high-density filter screen 29, where it is temporarily stored. The wastewater that meets the standards is then discharged from the drain outlet 31 through a pipe. The baffles of the secondary sedimentation tank 33 and the tertiary sedimentation tank 35 are then removed to connect the sedimentation tanks with the sedimentation chambers. The linear motor is then started to make the flat sediment scraper 32 and the trapezoidal sediment scraper 34 move back and forth, scraping the secondary sediment into the secondary sedimentation tank 33 and the tertiary sediment into the tertiary sedimentation tank 35, which is connected to the side wall of the filter tank 30.

[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A device for removing chromium from chromium-containing wastewater, characterized by comprising: Include: Wastewater conditioning tank (2), the wastewater conditioning tank (2) is fixedly connected with wastewater conditioning box (4) through pipeline, the wastewater conditioning box (4) is fixedly connected with wastewater treatment box (20) through pipeline, the wastewater conditioning box (4) is provided with a first baffle (7) in the middle, the first baffle (7) divides wastewater conditioning box (4) into PH adjusting cavity (5) and reduction reaction cavity (8), the inner wall of wastewater treatment box (20) is fixedly connected with second baffle (21), the lower inner wall of wastewater treatment box (20) is fixedly connected with second baffle (22), the second baffle (21), second baffle (22) divides wastewater treatment box (20) into first sedimentation cavity (23), second sedimentation cavity (24), third sedimentation cavity (25), the pipeline is connected with pump; The reduction reaction cavity (8) is provided with a rotating reagent adding device (10) inside, the rotating reagent adding device (10) includes a motor protection shell (17), the inside of the motor protection shell (17) is fixedly connected with a reversible motor (16), the lower surface of the motor protection shell (17) is threadedly connected with a base (18), the output end of the reversible motor (16) is fixedly connected with a main shaft (12), the side surface of the main shaft (12) is rotatably connected with an outer shell (13) and an inner cylinder (15), the inner cylinder (15) and the outer shell (13) are connected by a flow guide pipe (14), the upper surface of the outer shell (13) is fixedly connected with a reagent feeding hopper (11), the middle part of the flow guide pipe (14) is fixedly connected with a rotating blade (19) by a connecting rod; The upper surface of the second baffle (22) is fixedly connected with a first-stage water pump (28), the input end of the first-stage water pump (28) is fixedly connected in the deep part of the second sedimentation cavity (24) by a pipeline, the upper inner wall of the third sedimentation cavity (25) is provided with a high-density filter screen (29), and the output end of the first-stage water pump (28) is fixedly connected on the surface of the high-density filter screen (29) by a pipeline.

2. The apparatus for removing chromium from wastewater containing chromium according to claim 1, characterized by The upper inner wall of the wastewater conditioning tank (2) is fixedly connected with a primary filter screen (3), and the upper surface of the wastewater conditioning tank (2) is fixedly connected with a chromium wastewater inlet (1) by a pipeline.

3. The apparatus for removing chromium from wastewater containing chromium according to claim 1, characterized by The PH adjusting cavity (5), the reduction reaction cavity (8) and the first sedimentation cavity (23) are all provided with a stirring device, the stirring device includes a motor, the output end of the motor is fixedly connected with a stirring rod, and the side surface of the stirring rod is fixedly connected with a stirring blade.

4. The apparatus for removing chromium from wastewater containing chromium according to claim 1, characterized by The surface of the PH adjusting cavity (5) is fixedly connected with an acid tank (6) through a connecting pipe, the surface of the reduction reaction cavity (8) is connected with a reduction tank (9) through a connecting pipe, the upper surface of the first sedimentation cavity (23) is fixedly connected with a hydroxide tank (26) through a connecting pipe, and the upper surface of the second sedimentation cavity (24) is fixedly connected with a flocculating agent tank (27) through a connecting pipe.

5. The apparatus for removing chromium from wastewater containing chromium according to claim 1, characterized by The lower inner wall of the secondary precipitation cavity (24) is slidably connected with a flat sludge scraping plate (32), the lower side wall of the secondary precipitation cavity (24) is fixedly connected with a secondary sludge tank (33), and the flat sludge scraping plate (32) is fixedly connected with a straight plate linear motor (36).

6. The apparatus for removing chromium from wastewater containing chromium according to claim 1, characterized by The lower surface of the high-density filter screen (29) is fixedly connected with a filtered water tank (30), the inside of the filtered water tank (30) is fixedly connected with a drain (31) through a pipeline, the upper surface of the high-density filter screen (29) is slidably connected with a trapezoidal sludge scraping plate (34), the side wall of the filtered water tank (30) is fixedly connected with the side wall of a tertiary sludge tank (35), and the trapezoidal sludge scraping plate (34) is fixedly connected with a trapezoidal linear motor (37).

Images