Efficient iron-carbon reactor for pretreatment of organic wastewater and wastewater treatment equipment

Abstract

The application discloses a high-efficiency iron-carbon reactor for organic wastewater pretreatment and a wastewater treatment device. The high-efficiency iron-carbon reactor comprises a water and gas distribution device; the water and gas distribution device comprises a perforated plate fixed in a reactor chamber body and a plurality of second aeration members uniformly distributed on the perforated plate; a gas-liquid mixture passes through the second aeration members and the perforated plate to reach iron-carbon fillings; the second aeration member comprises a gas-liquid inlet pipe at the lower part and an aeration cap at the upper part; the gas-liquid inlet pipe and the aeration cap are coaxially arranged; the bottom of the gas-liquid inlet pipe is provided with a gas-liquid inlet; the aeration cap is provided with a plurality of uniformly distributed baffle strips in the circumferences, and gas-liquid slits are formed between adjacent baffle strips; the sum of the areas of all the gas-liquid slits is less than or equal to the area of the gas-liquid inlet; the wastewater treatment device comprises the high-efficiency iron-carbon reactor, a warm hydrolysis reactor and a Fenton reactor; and the application realizes uniform water and gas distribution through twice aeration.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a high-efficiency iron-carbon reactor and wastewater treatment equipment for the pretreatment of organic wastewater. Background Technology

[0002] High-concentration organic wastewater refers to industrial wastewater containing large amounts of organic matter, characterized by high COD concentration, complex composition, poor biodegradability, and high toxicity. Advanced oxidation processes (AOPs) degrade recalcitrant macromolecular pollutants into low-toxicity or non-toxic small molecules by generating strong oxidizing free radicals. AOPs are widely used in the pretreatment of high-concentration organic wastewater, with common methods including the Fenton process, the iron-carbon process, and ozone catalytic oxidation.

[0003] Iron-carbon microelectrolysis technology is a wastewater treatment process that uses iron and carbon as electrodes to spontaneously generate a weak current in acidic wastewater, thereby decomposing pollutants in the wastewater. Compared with other advanced oxidation methods, iron-carbon microelectrolysis technology is widely used in wastewater treatment in various industries such as chemical, printing and dyeing, electroplating, and pharmaceutical due to its high efficiency, low cost, and simple operation. It is especially suitable for treating high-concentration, high-color, and recalcitrant organic wastewater.

[0004] However, the following problems exist in the iron-carbon micro-electrolysis reactor:

[0005] Uneven water and gas distribution: Traditional iron-carbon micro-electrolysis reactors typically use simple bottom perforated pipes for water and gas distribution, which leads to turbulent water flow, dead zones, and an inability to guarantee the uniformity of the reaction. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a high-efficiency iron-carbon reactor and wastewater treatment equipment for organic wastewater pretreatment, which has the advantage of uniform water and gas distribution.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-efficiency iron-carbon reactor and wastewater treatment equipment for organic wastewater pretreatment includes a reactor chamber, a first aeration device, a water and air distribution device, and iron-carbon packing. The reactor chamber has a water inlet pipe connected to its bottom and an exhaust and drainage assembly connected to its top. The first aeration device includes a first aeration mechanism. The first aeration mechanism, the water and air distribution device, and the iron-carbon packing are arranged from bottom to top within the reactor chamber. The water and air distribution device includes a perforated plate fixed within the reactor chamber and several second aeration elements evenly distributed on the perforated plate. A gas-liquid mixture passes through the perforated plate via the second aeration elements and reaches the iron-carbon packing. The second aeration element includes a lower gas-liquid inlet pipe and an upper aeration cap. The gas-liquid inlet pipe and the aeration cap are coaxially arranged. The bottom of the gas-liquid inlet pipe has a gas-liquid inlet. The aeration cap has several circumferentially evenly distributed baffles, and gas-liquid slits are formed between adjacent baffles. The sum of the areas of all the gas-liquid slits is less than or equal to the area of ​​the gas-liquid inlet.

[0009] By adopting the above technical solution, high-concentration organic wastewater enters the bottom of the reactor chamber through the inlet pipe. Then, the first aeration mechanism aerates the wastewater at the bottom of the reactor chamber, making the distribution of substances in the high-concentration organic wastewater more uniform. The gas-liquid mixture then enters the upper side of the perforated plate through the second aeration element. At this time, the iron-carbon packing decomposes the pollutants in the wastewater. Finally, the exhaust and drainage components are used for exhaust and drainage. When the gas-liquid mixture passes through the second aeration element on the perforated plate, the presence of baffles increases the outflow resistance, thus forming a resistance water distribution. At the same time, since the sum of the areas between all baffles is less than or equal to the area of ​​the gas-liquid inlet, the resistance water distribution is further improved. This high-resistance water distribution ensures that the outflow of all gas-liquid slits is basically equal, thereby achieving uniform water and gas distribution, which is beneficial for the subsequent uniform reaction with the iron-carbon packing and ensures a stable upward flow in the reactor chamber.

[0010] Optionally, the second aeration element includes an annular intermediate support plate located between the aeration cap and the gas-liquid inlet pipe; a distribution cavity is formed between the intermediate support plate and the aeration cap; the bottom cross-section of the distribution cavity is larger than the cross-section of the gas-liquid inlet pipe.

[0011] The bottom cross-section of the distribution chamber is larger than the cross-section of the gas-liquid inlet pipe.

[0012] By adopting the above technical solution, the bottom cross-section of the distribution chamber is larger than the cross-section of the gas-liquid inlet pipe, making it easier for the gas-liquid mixture to enter the distribution chamber from the gas-liquid inlet pipe, reducing resistance and minimizing the loss of kinetic energy of the gas-liquid mixture. This allows it to have a greater speed when passing through the gas-liquid slit, resulting in better aeration.

[0013] Optionally, the volume of the dispensing cavity can be adjusted.

[0014] By adopting the above technical solution, there will inevitably be processing errors during the processing of the second aeration element, which will make the aeration effect not reach the expected level. In addition, the aeration effect required for different scenarios is also different. By adjusting the volume of the distribution chamber, the pressure at the inner end of the gas-liquid slit can be changed within a certain range, thereby changing the outflow velocity of the gas-liquid slit and adjusting the aeration effect.

[0015] Optionally, the upper part of the gas-liquid inlet pipe forms an adjustment pipe section; the adjustment pipe section passes through the perforated plate and the intermediate support plate in sequence; the adjustment pipe section and the intermediate support plate are coaxially arranged and threadedly connected; a connecting nut is screwed onto the adjustment pipe section; the connecting nut and the intermediate support plate clamp the perforated plate.

[0016] By adopting the above technical solution, the length of the adjusting tube extending into the distribution cavity can be changed by altering the position of the connecting nut on the adjusting tube, thereby changing the volume of the distribution cavity. This structure is simple, easy to operate, and facilitates rapid adjustment of the volume of the distribution cavity.

[0017] Optionally, the connecting nut is provided with a nut anti-rotation component; the nut anti-rotation component is used to restrict the connecting nut from rotating helically along the adjusting tube.

[0018] By adopting the above technical solution, the nut anti-rotation assembly restricts the connecting nut from rotating along the adjusting tube, thus preventing accidental changes in the length of the adjusting tube extending into the distribution cavity due to rotating the connecting nut, and reducing the possibility of misoperation.

[0019] Optionally, the baffle bar includes an arc portion and a vertical portion arranged from top to bottom; the aeration cap also includes a circular connecting bottom ring; the bottom of the baffle bar is connected to the connecting bottom ring; the gas-liquid inlet pipe is integrated with the intermediate support plate; the intermediate support plate is formed with a plurality of vertical sliding holes for vertical movement of the vertical portion; an adjusting nut is screwed onto the gas-liquid inlet pipe; the connecting bottom ring is coaxially rotatably connected to the adjusting nut; the aeration cap passes vertically through the perforated plate; the intermediate support plate and the perforated plate are detachably connected.

[0020] By adopting the above technical solution, the second aeration element can be vertically raised and lowered by rotating the adjusting nut on the gas-liquid inlet pipe, thereby changing the volume of the distribution chamber. This structure is simple, easy to operate, and facilitates rapid adjustment of the volume of the distribution chamber.

[0021] Optionally, the aeration cap is umbrella-shaped; the gas-liquid slits gradually widen from top to bottom or have equal widths from top to bottom; the width of the gas-liquid slits is 2-5 mm.

[0022] By adopting the above technical solution, the umbrella-shaped aeration cap allows for the uniform distribution of pressure applied to the aeration cap by the iron-carbon packing material, reducing the possibility of deformation. Furthermore, the 2-5mm width of the gas-liquid slit effectively prevents the loss of small iron-carbon packing particles.

[0023] Optionally, a filter cover may be detachably connected to the bottom of the gas-liquid inlet pipe.

[0024] By adopting the above technical solution, the presence of the filter cover effectively prevents suspended solids and other impurities in the wastewater from entering the second aeration element.

[0025] Optionally, a perforated plate limiting device is provided inside the reactor chamber; the perforated plate limiting device includes a lower support frame and an upper pressure frame; the lower support frame and the upper pressure frame are respectively fixedly connected to the reactor chamber; the perforated plate is located between the lower support frame and the upper pressure frame and is clamped by both.

[0026] By adopting the above technical solution, the perforated plate is clamped by the lower support frame and the upper pressure frame, so that the perforated plate does not need to be directly fixed to the reactor chamber body, reducing the setting of connection structure and reducing the possibility of damage to the perforated plate when it is directly fixed to the reactor chamber body.

[0027] A wastewater treatment device includes the aforementioned high-efficiency iron-carbon reactor, medium-temperature hydrolysis reactor, and Fenton reactor; the medium-temperature hydrolysis reactor is detachably connected to the inlet end of the inlet pipe; and the Fenton reactor is detachably connected to the outlet end of the exhaust and drainage assembly.

[0028] By adopting the above technical solutions, flocculation sedimentation, Fenton, hydrolysis and other processes can be combined according to water conditions to greatly improve the organic load of the system and cope with the changing water quality and conditions of high-concentration organic water. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the reactor chamber body of Embodiment 1 of the present invention, with the latter omitted.

[0030] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 1 of the present invention.

[0031] Figure 3 This is a top view of the first aeration mechanism of Embodiment 1 of the present invention.

[0032] Figure 4 This is a top view of the lower support frame of Embodiment 1 of the present invention.

[0033] Figure 5 This is a top view of the perforated plate according to Embodiment 1 of the present invention.

[0034] Figure 6 This is a schematic diagram of the structure of the second aeration element in Embodiment 1 of the present invention.

[0035] Figure 7 This is a cross-sectional structural schematic diagram of the second aeration element in Embodiment 1 of the present invention.

[0036] Figure 8 This is a cross-sectional structural schematic diagram of the second aeration element in Embodiment 2 of the present invention.

[0037] Figure 9 This is the invention Figure 8 A magnified structural diagram of part A in the diagram.

[0038] Figure 10 This is a cross-sectional structural schematic diagram of the second aeration element in Embodiment 3 of the present invention.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10. Reactor chamber body; 11. Inlet pipe; 12. Inspection hole; 13. Outlet pipe; 14. Exhaust pipe;

[0041] 20. Perforated plate limiting device; 21. Support pipe; 22. Circular steel plate; 23. Mesh support frame; 231. Mesh main body; 232. Angle steel ring; 24. Angle steel pressure strip;

[0042] 30. First aeration device; 31. Aeration inlet pipe; 32. First aeration mechanism; 33. Main aeration pipe; 34. Branch aeration pipe;

[0043] 40. Water and air distribution device;

[0044] 50. Perforated plate; 500. Reserved hole; 501. Limiting insertion hole; 502. Side connection hole; 51. Sector plate;

[0045] 60. Second aerator; 61. Gas-liquid inlet pipe; 610. Gas-liquid inlet; 611. Adjusting pipe section; 612. Gas-liquid entry section; 62. Intermediate support plate; 620. Intermediate connecting screw hole; 621. Connecting screw; 622. Vertical sliding hole; 623. Limiting post; 63. Aeration cap; 630. Distribution chamber; 631. Baffle; 6311. Arc section; 6312. Vertical section; 632. Gas-liquid slit; 6321. First slit; 6322. Second slit; 633. Connecting bottom ring; 64. Connecting nut; 640. Radial expansion groove; 641. External threaded hole; 642. Radial adjusting screw; 643. Stop block; 65. Filter cover; 66. Adjusting nut;

[0046] 70. Iron-carbon filler;

[0047] 80. Outflow weir. Detailed Implementation

[0048] The following is in conjunction with the appendix Figures 1-10 The present invention will be described in further detail below.

[0049] Example 1: A high-efficiency iron-carbon reactor for the pretreatment of organic wastewater is disclosed, with reference to... Figure 1 and Figure 2 The reactor includes a reactor chamber 10, a perforated plate limiting device 20, a first aeration device 30, a water and air distribution device 40, an iron-carbon packing material 70, and an outlet weir 80. The bottom of the reactor chamber 10 is connected to an inlet pipe 11, and the top is connected to an exhaust and drainage assembly. The exhaust and drainage assembly includes an outlet pipe 13 connected to the reactor chamber 10 and an exhaust pipe 14 located at the top of the outlet pipe 13. Valves are installed on both the outlet pipe 13 and the exhaust pipe 14. The first aeration device 32, the water and air distribution device 40, the iron-carbon packing material 70, and the outlet weir 80 are arranged from bottom to top within the reactor chamber 10. The water and air distribution device 40 includes a perforated plate 50 fixed within the reactor chamber 10 and several second aeration elements 60 evenly distributed on the perforated plate 50. The perforated plate 50 supports the iron-carbon packing material 70. The gas-liquid mixture passes through the perforated plate 50 and reaches the iron-carbon packing material 70 via the second aeration elements 60.

[0050] refer to Figure 1 , Figure 2 and Figure 4 The perforated plate limiting device 20 includes a lower support frame and an upper pressure frame. The lower support frame includes a grid support frame 23, several circular steel plates 22, and several support pipes 21. The grid support frame 23 includes a grid body 231 and angle steel rings 232 fixed around the grid body 231. The circular steel plates 22 are welded to the bottom of the intersection of the grid body 231. The support pipes 21 correspond one-to-one with the circular steel plates 22, and their upper ends are welded to the circular steel plates 22, and their lower ends are welded to the bottom of the reactor chamber 10. The grid support frame 23 is welded to the inner wall of the reactor chamber 10 through the angle steel rings 232. The upper pressure frame includes several angle steel strips 24. The perforated plate 50 is placed on the grid support frame 23, and then the angle steel strips 24 are pressed on the perforated plate 50 and their two ends are welded to the inner wall of the reactor chamber 10 respectively.

[0051] refer to Figure 5Because the diameter of the perforated plate 50 is close to 5m, the overall handling and assembly are quite troublesome. Therefore, the perforated plate 50 is made of four 90-degree fan-shaped plates 51 welded together. During installation, the four fan-shaped plates 51 are first placed on the welded mesh support frame 23, then assembled into a complete perforated plate 50, and finally welded together. The perforated plate 50 is made of PP material. Several φ30mm reserved holes 500 are formed on the fan-shaped plates 51. The reserved holes 500 are used to install the second aeration element 60. The reserved holes 500 of the perforated plate 50 are distributed in a rectangular array, and the spacing between adjacent reserved holes 500 is 300-500mm.

[0052] The iron-carbon filler 70 is spherical with a diameter of 30-50 mm, a specific surface area of ​​1-1.4 m² / g, a porosity of 60-70%, and its chemical composition must include refined iron powder, carbon, proprietary catalyst, and activator.

[0053] refer to Figure 6 and Figure 7 The second aeration element 60 includes a straight cylindrical gas-liquid inlet pipe 61, an annular intermediate support plate 62, and an aeration cap 63. The gas-liquid inlet pipe 61 and the aeration cap 63 are connected as one unit by the intermediate support plate 62 and are coaxially arranged. The bottom of the gas-liquid inlet pipe 61 has a gas-liquid inlet 610. A distribution cavity 630 is formed between the aeration cap 63 and the intermediate support plate 62, and the bottom cross-section of the distribution cavity 630 is larger than the cross-section of the gas-liquid inlet pipe 61. This makes it easier for the gas-liquid mixture to enter the distribution cavity 630 from the gas-liquid inlet pipe 61, reducing resistance and minimizing the loss of kinetic energy of the gas-liquid mixture. The second aeration element 60 is made of ABS material.

[0054] refer to Figure 6 and Figure 7The aeration cap 63 includes several circumferentially distributed baffles 631; gas-liquid slits 632 are formed between adjacent baffles 631; in order to make the outflow of all gas-liquid slits 632 approximately the same, the sum of the areas of all gas-liquid slits 632 is less than or equal to the area of ​​the gas-liquid inlet 610, and the ratio of the sum of the areas of all gas-liquid slits 632 to the area of ​​the gas-liquid inlet 610 is 0.8-1; wherein the aeration cap 63 is umbrella-shaped to uniformly distribute the pressure applied by the iron-carbon packing 70; all gas-liquid slits 632 gradually widen from top to bottom or have equal width from top to bottom; the width of all gas-liquid slits 632 is 2-5mm, which effectively prevents the loss of small iron-carbon packing particles, so that even if backwashing is performed, the loss of iron-carbon packing will not be large, which is conducive to cleaning the iron-carbon packing 70 through backwashing, slowing down the rate of iron-carbon packing 70 caking and passivation, and improving the treatment effect of iron-carbon packing 70. The outer cylindrical surface of the gas-liquid inlet pipe 61 is formed with external threads. During installation, the gas-liquid inlet pipe 61 of the second aeration element 60 passes through the reserved hole 500 from top to bottom, and then is connected to the perforated plate 50 by the gasket and connecting nut 64 fitted on the gas-liquid inlet pipe 61.

[0055] refer to Figure 6 and Figure 7 To prevent suspended solids and other impurities in the wastewater from entering the second aeration element 60, a filter cover 65 is connected to the bottom of the gas-liquid inlet pipe 61. For easy disassembly and assembly, the filter cover 65 is screwed to the bottom of the gas-liquid inlet pipe 61.

[0056] refer to Figures 1-3 The first aeration device 30 includes an aeration inlet pipe 31 and a first aeration mechanism 32. The aeration inlet pipe 31 enters the reactor chamber 10 vertically from top to bottom and passes through the perforated plate 50. The outer end of the aeration inlet pipe 31 is connected to an air supply device such as a blower. The first aeration mechanism 32 is lower than the water and air distribution device 40. The first aeration mechanism 32 includes an aeration main pipe 33 and several aeration branch pipes 34. The aeration branch pipes 34 are arranged vertically on both sides of the aeration main pipe 33 in a fishbone pattern. One end of the aeration main pipe 33 is connected to the aeration inlet pipe 31 and the other end is blocked. One end of the aeration branch pipe 34 is connected to the aeration main pipe 33 and the other end is blocked. The bottom of the aeration branch pipe 34 is provided with aeration holes inclined at 45 degrees. The aeration holes are divided into two groups and the two groups of aeration holes are symmetrically arranged with respect to the vertical surface of the aeration main pipe 33. The diameter of the aeration holes is 5-8 mm and the spacing between adjacent aeration holes is 150-300 mm. To increase the positional stability of the first aeration mechanism 32 and improve the aeration quality, the aeration branch pipe 34 is connected to the support pipe 21 by fasteners.

[0057] refer to Figure 1 and Figure 2The outlet weir 80 is fixed on the inner wall of the reactor chamber 10 and has two annular weirs arranged coaxially with the reactor chamber 10; the outlet pipe 13 is connected to the bottom of the outlet weir 80, so that the gas-liquid mixture overflowing from the outlet weir 80 flows out from the outlet pipe 13.

[0058] For subsequent inspection and maintenance, two inspection holes 12 are provided at the bottom of the reactor chamber 10, one above the other; the inspection holes 12 are directly opposite the bottom of the water distribution and aeration layer and the iron-carbon layer.

[0059] Generally, iron-carbon reactors require the addition of acid to ensure the pH stability inside the tank. In order to reduce the footprint of iron-carbon reactors, a pipe mixer can be connected to the outside of the reactor chamber 10 to achieve external acid addition.

[0060] Example 2: The difference between Example 2 and Example 1 is as follows: (Refer to...) Figure 8 and Figure 9 The relative position of the intermediate support plate 62 and the gas-liquid inlet pipe 61 is adjustable; the gas-liquid inlet pipe 61 includes an upper regulating pipe section 611 and a lower gas-liquid inlet section 612; the inner diameters of the gas-liquid inlet pipe 61 and the gas-liquid inlet section 612 are the same; the outer diameter of the gas-liquid inlet pipe 61 is larger than the outer diameter of the gas-liquid inlet section 612; the regulating pipe section 611 is formed with external threads; the connecting nut 64 is screwed onto the regulating pipe section 611; the intermediate support plate 62 is formed with a coaxially arranged intermediate connecting screw hole 620; the regulating pipe section 611 is threaded into the intermediate connecting screw hole 620 and the two have good sealing performance. During operation, first adjust the relative position of the connecting nut 64 and the adjusting tube 611. Then, screw the adjusting tube 611 into the middle connecting screw hole 620 until the connecting nut 64 abuts against the bottom surface of the perforated plate 50. This controls the length of the adjusting tube 611 extending into the distribution chamber 630, thereby adjusting the volume of the distribution chamber 630. This changes the pressure inside the distribution chamber 630, which in turn changes the pressure at the inner end of the gas-liquid slit 632 within a certain range, thereby changing the outflow velocity of the gas-liquid slit 632 and adjusting the aeration effect.

[0061] To prevent the aeration cap 63 from accidentally rotating during adjustment and affecting the adjustment speed, please refer to... Figure 8 The bottom surface of the intermediate support plate 62 is formed with several circumferentially evenly distributed limiting posts 623, and the perforated plate 50 is formed with several limiting holes 501 for the limiting posts 623 to be inserted from top to bottom.

[0062] To prevent accidental rotation of the connecting nut 64 from unintentionally altering the length of the adjusting tube 611 extending into the distribution cavity 630, refer to... Figure 8 and Figure 9 The connecting nut 64 is provided with a nut anti-rotation component; the nut anti-rotation component is used to limit the connecting nut 64 from rotating along the adjusting tube 611, thereby reducing the possibility of misoperation.

[0063] refer to Figure 9 The inner surface of the connecting nut 64 is formed with at least one radial expansion groove 640; the nut anti-rotation assembly includes a stop block 643 and a radial adjusting screw 642; the stop block 643 is radially movable within the radial expansion groove 640 and has an internal thread portion formed on its inner sidewall that is the same as the internal thread of the connecting nut 64; an externally threaded hole 641 is formed on the outer sidewall of the radial expansion groove 640; the radial adjusting screw 642 passes through and is screwed into the external threaded hole 641; the axial direction of the radial adjusting screw 642 is the same as the moving direction of the stop block 643; to facilitate the rotation of the radial adjusting screw 642, a regular hexagonal groove-shaped rotation drive groove is formed on the outer end face of the radial adjusting screw 642; when the connecting nut 64 is rotated to the appropriate position, the internal thread portion abuts against the external thread portion of the adjusting tube portion 611, so that the connecting nut 64 is not easily rotated accidentally. In fact, a tension spring can be connected between the outer wall of the radial expansion groove 640 and the stop block 643. When the stop block 643 does not have a limiting function, the tension spring pulls the stop block 643 outward and separates it from the external thread of the regulating tube 611, thereby reducing the impact on the external thread of the regulating tube 611.

[0064] Alternatively, at least one radial bolt can be directly screwed onto the connecting nut 64. When the connecting nut 64 needs to be stopped, the radial bolt is rotated to move inward and abut against the external thread of the adjusting tube 611. In order to reduce accidental damage to the external thread on the adjusting tube 611, a soft damping element, such as a rubber block, can be fixed to the inner end of the radial bolt.

[0065] Example 3: The difference between Example 3 and Example 1 is as follows: (Refer to...) Figure 10 The intermediate support plate 62 is integrated with the gas-liquid inlet pipe 61, and the aeration cap 63 is vertically slidably disposed relative to the intermediate support plate 62; the second aeration element 60 is connected to the perforated plate 50 through the intermediate support plate 62.

[0066] refer to Figure 10The baffle 631 includes an arcuate portion 6311 and a vertical portion 6312 arranged from top to bottom; the gas-liquid slit 632 includes a first slit 6321 located between adjacent arcuate portions 6311 and a second slit 6322 located between adjacent vertical portions 6312; the aeration cap 63 also includes an annular connecting bottom ring 633; ​​the bottom of the baffle 631 is connected to the connecting bottom ring 633; ​​the intermediate support plate 62 is formed with a plurality of vertical sliding joints for vertical movement of the vertical portion 6312. Hole 622; A sealing ring is provided inside the vertical sliding hole 622 so that the vertical part 6312 can slide vertically and sealed within the vertical sliding hole 622; An adjusting nut 66 is screwed onto the gas-liquid inlet pipe 61; The adjusting nut 66 is formed with a rotating groove that mates with the connecting bottom ring 633; ​​The connecting bottom ring 633 is coaxially rotatably connected to the adjusting nut 66 via the rotating groove; The lower part of the aeration cap 63 passes through the reserved hole 500 of the perforated plate 50; The intermediate support plate 62 is detachably connected to the perforated plate 50.

[0067] refer to Figure 10 A number of connecting screws 621 are formed on the bottom surface of the intermediate support plate 62; a number of side connecting holes 502 are formed on the perforated plate 50; the side connecting holes 502 correspond one-to-one with the connecting screws 621; the connecting screws 621 pass through the corresponding side connecting holes 502 from top to bottom and are screwed with connecting nuts 64.

[0068] To address the varying water quality conditions of concentrated organic water, the inlet end of the inlet pipe and the outlet end of the exhaust and drainage components of the high-efficiency iron-carbon reactors in Examples 1 to 3 can be connected to other reactors via flanges to form a wastewater treatment device. For example, a mesothermal hydrolysis reactor can be connected to the inlet end of the inlet pipe of the high-efficiency iron-carbon reactor, and a Fenton reactor can be connected to the inlet end of the inlet pipe. The wastewater treatment device thus formed is used to remove AOX and COD from the wastewater. After the wastewater reacts in the mesothermal hydrolysis reactor, it enters the high-efficiency iron-carbon reactor through a booster pump. The first aeration device 30 is turned on and the exhaust pipe 14 is opened. After an 8-hour retention time, the wastewater exits from the effluent weir 80 and flows to the Fenton reactor. This wastewater treatment device has an AOX removal rate of over 90% and a COD removal rate of over 60%.

[0069] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An efficient iron-carbon reactor for pretreatment of organic wastewater, comprising a reactor chamber body (10), a first aeration device (30), a water and air distribution device (40), and iron-carbon fillers (70); the bottom of the reactor chamber body (10) is connected with a water inlet pipe (11), and the upper part is connected with an exhaust and drainage assembly; the first aeration device (30) comprises a first aeration mechanism (32); the first aeration mechanism (32), the water and air distribution device (40), and the iron-carbon fillers (70) are arranged in the reactor chamber body (10) from bottom to top; characterized in that: The water and air distribution device (40) comprises a perforated plate (50) fixed in the reactor chamber body (10) and a plurality of second aeration members (60) uniformly distributed on the perforated plate (50); the gas-liquid mixture passes through the second aeration members (60) and the perforated plate (50) to reach the iron-carbon filler (70); the second aeration member (60) comprises a lower gas-liquid inlet pipe (61) and an upper aeration cap (63); the gas-liquid inlet pipe (61) and the aeration cap (63) are coaxially arranged; the bottom of the gas-liquid inlet pipe (61) is provided with a gas-liquid inlet (610); the aeration cap (63) is provided with a plurality of circumferentially uniformly distributed bars (631) and the gas-liquid slits (632) are formed between adjacent bars (631); the sum of the areas of all the gas-liquid slits (632) is less than or equal to the area of the gas-liquid inlet (610); The second aeration member (60) comprises a circular ring-shaped intermediate support plate (62) between the aeration cap (63) and the gas-liquid inlet pipe (61); the intermediate support plate (62) and the aeration cap (63) form a distribution cavity (630); the volume of the distribution cavity (630) is adjustably arranged and is adjusted by a volume adjusting mechanism; the structure of the volume adjusting mechanism is as follows: the upper part of the gas-liquid inlet pipe (61) forms an adjusting pipe part (611), the adjusting pipe part (611) passes through the perforated plate (50) and the intermediate support plate (62) in sequence, the adjusting pipe part (611) is coaxially arranged with the intermediate support plate (62) and is screw-connected, the adjusting pipe part (611) is screw-connected with a connecting nut (64), and the connecting nut (64) and the intermediate support plate (62) clamp the perforated plate (50).

2. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: The bottom cross section of the distribution cavity (630) is larger than the cross section of the gas-liquid inlet pipe (61).

3. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: The connecting nut (64) is provided with a nut rotation-stopping assembly; the nut rotation-stopping assembly is used to limit the screw rotation of the connecting nut (64) along the adjusting pipe part (611).

4. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: Another structure of the volume adjusting mechanism is as follows: the bar (631) comprises a circular arc part (6311) and a vertical part (6312) arranged from top to bottom; the aeration cap (63) further comprises a circular ring-shaped connecting bottom ring (633); the bottom of the bar (631) is connected with the connecting bottom ring (633); the gas-liquid inlet pipe (61) is integrally connected with the intermediate support plate (62); the intermediate support plate (62) is formed with a plurality of vertical sliding holes (622) for vertical movement of the vertical part (6312); the gas-liquid inlet pipe (61) is screw-connected with an adjusting nut (66); the connecting bottom ring (633) is coaxially rotationally connected on the adjusting nut (66); the aeration cap (63) vertically passes through the perforated plate (50); and the intermediate support plate (62) is detachably connected with the perforated plate (50).

5. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: The aeration cap (63) is umbrella-shaped; the gas-liquid slit (632) is gradually widened from top to bottom or has equal width from top to bottom; the width of the gas-liquid slit (632) is 2-5 mm.

6. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: The bottom of the gas-liquid inlet pipe (61) is detachably connected with a filter cover (65).

7. The high-efficiency iron-carbon reactor for pretreating organic wastewater according to claim 1, characterized in that: The reactor chamber body (10) is provided with a perforated plate limiting device (20); the perforated plate limiting device (20) comprises a lower support frame and an upper pressing frame; the lower support frame and the upper pressing frame are fixedly connected with the reactor chamber body (10) respectively; the perforated plate (50) is located between the lower support frame and the upper pressing frame and is clamped by the two.

8. A wastewater treatment apparatus, characterized by: The high-efficiency iron-carbon reactor, the medium-temperature hydrolysis reactor and the Fenton reactor of any one of claims 1-7 are included; the medium-temperature hydrolysis reactor is connected with the water inlet end of the water inlet pipe (11); the Fenton reactor is connected with the water outlet end of the exhaust and drainage assembly.

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