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

Abstract

The invention discloses an efficient iron-carbon reactor for organic wastewater pretreatment and wastewater treatment equipment. The efficient iron-carbon reactor comprises a water and gas distribution device, the water and gas distribution device comprises a perforated plate fixed in the reactor chamber body and a plurality of second aeration pieces uniformly distributed on the perforated plate; the gas-liquid mixture passes through the perforated plate through the second aeration piece to reach the iron-carbon filler; the second aeration piece 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; a gas-liquid inlet is formed in the bottom of the gas-liquid inlet pipe; the aeration cap is provided with a plurality of barrier strips which are uniformly distributed on the circumference, and a gas-liquid slit is formed between every two adjacent barrier strips; the sum of the areas of all the gas-liquid slits is smaller than or equal to the area of the gas-liquid inlet; the wastewater treatment equipment comprises the high-efficiency iron-carbon reactor, a thermal hydrolysis reactor and a Fenton reactor. Uniform water and gas distribution is realized through two times of aeration.

Description

Technical Field

[0001] The present invention relates to the field of wastewater treatment, in particular to a high-efficiency iron-carbon reactor and wastewater treatment equipment for pretreating organic wastewater. Background Art

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

[0003] Iron-carbon micro-electrolysis technology is a wastewater treatment process that uses iron and carbon as electrodes to spontaneously generate a weak electric current in acidic wastewater, thereby degrading pollutants in the wastewater. Compared to other advanced oxidation processes, iron-carbon micro-electrolysis technology is widely used in wastewater treatment in various industries, including chemical, printing and dyeing, electroplating, and pharmaceuticals, due to its high efficiency, low cost, and ease of operation. It is particularly suitable for treating high-concentration, high-color, and difficult-to-degrade concentrated organic wastewater.

[0004] However, there are the following problems in the iron-carbon micro-electrolysis reactor: Uneven water and gas distribution: Traditional iron-carbon micro-electrolysis reactors usually use simple bottom perforated tubes to distribute water and gas, which leads to turbulent water flow, dead zones, and inability to ensure reaction uniformity. Summary of the Invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a high-efficiency iron-carbon reactor and wastewater treatment equipment for pre-treating organic wastewater, which has the advantage of uniform water and gas distribution.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A high-efficiency iron-carbon reactor and wastewater treatment equipment for pre-treating organic wastewater, comprising a reactor chamber, a first aeration device, a water and air distribution device and an iron-carbon filler; the bottom of the reactor chamber is connected to a water inlet pipe, and the upper part is connected to an exhaust and drainage assembly; the first aeration device comprises a first aeration mechanism; the first aeration mechanism, the water and air distribution device and the iron-carbon filler are arranged in the reactor chamber from bottom to top; the water and air distribution device comprises a perforated plate fixed in the reactor chamber and a plurality of second aeration members evenly distributed on the perforated plate; a gas-liquid mixture passes through the perforated plate through the second aeration member to reach the iron-carbon filler; the second aeration member comprises 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 a plurality of circumferentially evenly distributed ribs and gas-liquid slits are formed between adjacent ribs; the sum of the areas of all the gas-liquid slits is less than or equal to the area of ​​the gas-liquid inlet.

[0007] By adopting the above technical solution, high-concentration organic wastewater enters the bottom of the reactor chamber through the water inlet pipe, and then the first aeration mechanism aerates at the bottom of the reactor chamber to make the distribution of substances in the high-concentration organic wastewater more uniform, and then the gas-liquid mixture passes through the second aeration piece on the perforated plate and enters the upper side of the perforated plate, at this time the iron-carbon filler decomposes the pollutants in the wastewater, and finally the exhaust and drainage components are used for exhaust and drainage; when the gas-liquid mixture passes through the second aeration piece on the perforated plate, the presence of the baffles will increase the outflow resistance, thereby forming resistance water distribution, and at the same time, since the sum of the areas between all the baffles is less than or equal to the area of ​​the gas-liquid inlet, the resistance water distribution is further improved, and this large resistance water distribution ensures that the outflow rate of all gas-liquid slits is basically equal, thereby achieving uniform water and gas distribution, which is beneficial to the subsequent uniform reaction with the iron-carbon filler, and at the same time ensures a stable rising flow state in the reactor chamber.

[0008] 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; and a bottom cross-section of the distribution cavity is larger than a cross-section of the gas-liquid inlet pipe.

[0009] The bottom cross-section of the distribution chamber is larger than the cross-section of the gas-liquid inlet pipe.

[0010] 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, and the gas-liquid mixture enters the distribution chamber from the gas-liquid inlet pipe more easily, thereby reducing resistance and reducing the loss of kinetic energy of the gas-liquid mixture. As a result, the gas-liquid mixture can have a greater speed when subsequently passing through the gas-liquid slit, and the aeration effect is better.

[0011] Optionally, the volume of the distribution chamber is adjustable.

[0012] By adopting the above technical solution, there will inevitably be processing errors in the processing of the second aeration component, which will make the aeration effect unable to reach the expected effect. In addition, the aeration effects required in different scenarios are 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.

[0013] Optionally, the upper part of the gas-liquid inlet pipe forms an adjusting pipe portion; the adjusting pipe portion passes through the perforated plate and the intermediate support plate in sequence; the adjusting pipe portion is coaxially arranged with the intermediate support plate and threadedly connected; a connecting nut is threaded on the adjusting pipe portion; the connecting nut and the intermediate support plate clamp the perforated plate.

[0014] By adopting the above technical solution, by changing the position of the connecting nut on the adjusting tube, the length of the adjusting tube extending into the distribution chamber can be changed, thereby changing the volume of the distribution chamber. This has a simple structure, is easy to operate, and is conducive to quickly adjusting the volume of the distribution chamber.

[0015] Optionally, a nut anti-rotation assembly is provided on the connecting nut; the nut anti-rotation assembly is used to limit the spiral rotation of the connecting nut along the adjusting tube portion.

[0016] By adopting the above technical solution, the nut stop assembly limits the connecting nut from rotating spirally along the adjusting tube portion, so that the length of the adjusting tube portion extending into the distribution chamber will not be accidentally changed due to rotating the connecting nut, thereby reducing the possibility of misoperation.

[0017] Optionally, the baffle includes an arc portion and a vertical portion arranged from top to bottom; the aeration cap also includes an annular connecting bottom ring; the bottom of the baffle is connected to the connecting bottom ring; the gas and 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 threaded on the gas and liquid inlet pipe; the connecting bottom ring is coaxially connected to the adjusting nut; the aeration cap vertically passes through the perforated plate; the intermediate support plate is detachably connected to the perforated plate.

[0018] By adopting the above technical solution, the second aeration element can be driven to move vertically upward and downward as a whole by rotating the adjusting nut on the gas-liquid inlet pipe, thereby changing the volume of the distribution chamber. This has a simple structure, is easy to operate, and is conducive to quickly adjusting the volume of the distribution chamber.

[0019] Optionally, the aeration cap is in an umbrella shape; the gas-liquid slits gradually widen from top to bottom or have the same width from top to bottom; and the width of the gas-liquid slits is 2-5 mm.

[0020] By adopting the above technical solution, the aeration cap is in the shape of an umbrella, which can evenly disperse the pressure exerted by the iron-carbon filler on the aeration cap, reducing the possibility of deformation of the aeration cap. In addition, the width of the gas-liquid slit is 2-5mm, which effectively prevents the loss of small iron-carbon fillers. Optionally, a filter cover is detachably connected to the bottom of the gas-liquid inlet pipe.

[0021] By adopting the above technical solution, the presence of the filter cover effectively prevents impurities such as suspended matter in the wastewater from entering the second aeration element.

[0022] Optionally, a perforated plate limiting device is provided in the reactor chamber body; 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 fixedly connected to the reactor chamber body respectively; the perforated plate is located between the lower support frame and the upper pressure frame and is clamped by both.

[0023] 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 the connection structure and reducing the possibility of the perforated plate being damaged when it is directly fixed to the reactor chamber body.

[0024] A wastewater treatment device comprises the above-mentioned high-efficiency iron-carbon reactor, warm hydrolysis reactor and Fenton reactor; the warm hydrolysis reactor is detachably connected to the water inlet end of the water inlet pipe; the Fenton reactor is detachably connected to the water outlet end of the exhaust and drainage component.

[0025] By adopting the above technical solutions, flocculation sedimentation, Fenton, hydrolysis and other processes can be combined according to water conditions to greatly increase the organic load of the system and cope with the variable water quality and conditions of high-concentration organic water. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the reactor chamber portion omitted according to the first embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the cross-section structure of the first embodiment of the present invention.

[0028] Figure 3 1 is a schematic top view of the structure of the first aeration mechanism according to the first embodiment of the present invention.

[0029] Figure 4 It is a schematic structural diagram of a top view of the lower support frame of the first embodiment of the present invention.

[0030] Figure 5 It is a schematic structural diagram of a top view of a perforated plate according to the first embodiment of the present invention.

[0031] Figure 6It is a structural schematic diagram of the second aeration element of the first embodiment of the present invention.

[0032] Figure 7 It is a schematic structural diagram of the cross section of the second aeration element according to the first embodiment of the present invention.

[0033] Figure 8 It is a schematic structural diagram of the cross section of the second aeration element of the second embodiment of the present invention.

[0034] Figure 9 The present invention Figure 8 Schematic diagram of the partially enlarged structure of A in the middle.

[0035] Figure 10 3 is a schematic structural diagram of a cross section of the second aeration element of the third embodiment of the present invention.

[0036] Description of reference numerals: 10. Reactor chamber; 11. Water inlet pipe; 12. Manhole; 13. Water outlet pipe; 14. Exhaust pipe; 20. Perforated plate limiter; 21. Support tube; 22. Circular steel plate; 23. Grid support frame; 231. Grid body; 232. Angle steel ring; 24. Angle steel strip; 30. First aeration device; 31. Aeration inlet pipe; 32. First aeration mechanism; 33. Aeration main pipe; 34. Aeration branch pipe; 40. Water and air distribution device; 50, perforated plate; 500, reserved hole; 501, limit jack; 502, side connection hole; 51, fan-shaped plate; 60. Second aeration element; 61. Gas-liquid inlet pipe; 610. Gas-liquid inlet; 611. Adjustment pipe; 612. Gas-liquid inlet; 62. Intermediate support plate; 620. Intermediate connecting screw hole; 621. Connecting screw; 622. Vertical sliding hole; 63. Aeration cap; 630. Distribution chamber; 631. Stop bar; 6311. Circular arc portion; 6312. Vertical portion; 632. Gas-liquid slit; 6321. First slit; 6322. Second slit; 633. Connecting bottom ring; 64. Connecting nut; 640. Radial expansion slot; 641. Externally threaded hole; 642. Radial adjustment screw; 643. Stop block; 65. Filter cover; 66. Adjustment nut. 70. Iron-carbon filler; 80. Water outlet weir. DETAILED DESCRIPTION

[0037] The following is combined with Figures 1-10 The present invention is described in further detail.

[0038] Example 1: Disclose a high-efficiency iron-carbon reactor for pretreatment of organic wastewater, referring to Figure 1 and Figure 2 , including a reactor chamber body 10, a perforated plate limiting device 20, a first aeration device 30, a water and air distribution device 40, an iron-carbon filler 70 and a water outlet weir 80; the bottom of the reactor chamber body 10 is connected to a water inlet pipe 11, and the upper part is connected to an exhaust and drainage assembly; the exhaust and drainage assembly includes a water outlet pipe 13 connected to the reactor chamber body 10 and an exhaust pipe 14 arranged on the top of the water outlet pipe 13; valves are provided on the water outlet pipe 13 and the exhaust pipe 14; the first aeration mechanism 32, the water and air distribution device 40, the iron-carbon filler 70 and the water outlet weir 80 are arranged in the reactor chamber body 10 from bottom to top; the water and air distribution device 40 includes a perforated plate 50 fixed in the reactor chamber body 10 and a plurality of second aeration elements 60 evenly distributed on the perforated plate 50; the perforated plate 50 supports the iron-carbon filler 70; the gas-liquid mixture passes through the perforated plate 50 through the second aeration element 60 to reach the iron-carbon filler 70.

[0039] 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 tubes 21; the grid support frame 23 includes a grid body 231 and an angle steel ring 232 fixed around the grid body 231; the circular steel plate 22 is welded to the bottom of the intersection of the grid body 231; the support tube 21 corresponds to the circular steel plate 22 one by one and its upper end is welded to the circular steel plate 22 and its lower end is welded to the bottom of the reactor chamber body 10; the grid support frame 23 is welded to the inner wall of the reactor chamber body 10 through the angle steel ring 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 strip 24 is pressed on the perforated plate 50 and its two ends are respectively welded to the inner wall of the reactor chamber body 10.

[0040] refer to Figure 5 Because the perforated plate 50 has a diameter of nearly 5m, handling and assembly are complex. Therefore, the perforated plate 50 is welded together from four 90-degree sector plates 51. During installation, the four sectors 51 are first placed on the welded grid support frame 23, then assembled into a complete perforated plate 50, which is then welded together. The perforated plate 50 is made of PP. Several 30mm diameter pre-formed holes 500 are formed in the sector plates 51 for installing the second aerator 60. The pre-formed holes 500 are arranged in a rectangular array, with spacing of 300-500mm between adjacent pre-formed holes 500.

[0041] The iron-carbon filler 70 is spherical and has a diameter of 30-50 mm, a specific surface area of ​​1-1.4 m2 / g, a porosity of 60-70%, and a chemical composition including refined iron powder, carbon, a proprietary catalyst, and an activator.

[0042] refer to Figure 6 and Figure 7 The second aerator 60 includes a straight, tubular 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 by the intermediate support plate 62 and are coaxially arranged. A gas-liquid inlet 61 has a gas-liquid inlet 610 at its bottom. A distribution chamber 630 is formed between the aeration cap 63 and the intermediate support plate 62. The bottom cross-section of the distribution chamber 630 is larger than the cross-section of the gas-liquid inlet pipe 61. This facilitates the passage of the gas-liquid mixture from the gas-liquid inlet pipe 61 into the distribution chamber 630, reducing resistance and kinetic energy loss. The second aerator 60 is made of ABS.

[0043] refer to Figure 6 and Figure 7 The aeration cap 63 includes a number of circumferentially evenly distributed baffles 631; gas-liquid slits 632 are formed between adjacent baffles 631; in order to make the outflow rate of all gas-liquid slits 632 roughly 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 in the shape of an umbrella to evenly disperse the pressure applied by the iron-carbon filler 70; all gas-liquid slits 632 become wider from top to bottom or have the same width from top to bottom; the width of all gas-liquid slits 632 is 2-5mm, which effectively prevents the loss of small-grain iron-carbon fillers, so that even if backwashing is performed, the loss of iron-carbon fillers will not be large, which is conducive to cleaning the iron-carbon fillers 70 by backwashing, slowing down the speed of hardening and passivation of the iron-carbon fillers 70, and improving the treatment effect of the iron-carbon fillers 70. The gas-liquid inlet pipe 61 has an external thread formed on its outer cylindrical surface. During installation, the gas-liquid inlet pipe 61 of the second aerator 60 passes through the reserved hole 500 from top to bottom, and is then connected to the perforated plate 50 through the gasket and connecting nut 64 sleeved on the gas-liquid inlet pipe 61.

[0044] refer to Figure 6 and Figure 7 In order to prevent impurities such as suspended matter 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. In order to facilitate disassembly and assembly, the filter cover 65 is screwed to the bottom of the gas-liquid inlet pipe 61.

[0045] refer to Figure 1-Figure 3The first aeration device 30 includes an aeration inlet pipe 31 and a first aeration mechanism 32. The aeration inlet pipe 31 vertically enters the reactor chamber 10 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 fan. 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 a plurality of 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. Aeration holes are arranged at a 45-degree angle at the bottom of the aeration branch pipe 34. The aeration holes are divided into two groups and the two groups of aeration holes are symmetrically arranged with respect to the vertical symmetry plane of the aeration main pipe 33. The aperture of the aeration holes is 5-8 mm, and the spacing between adjacent aeration holes is 150-300 mm. In order to increase the position stability of the first aeration mechanism 32 and improve the aeration quality, the aeration branch pipe 34 is connected to the support pipe 21 through a fastener.

[0046] refer to Figure 1 and Figure 2 The outlet weir 80 is fixed on the inner wall of the reactor chamber 10 and has two annular weir bodies coaxially arranged 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.

[0047] For subsequent inspection and maintenance, two inspection holes 12 distributed vertically are provided at the lower portion of the reactor chamber body 10; the inspection holes 12 face the bottom of the water distribution aeration layer and the iron-carbon layer.

[0048] Generally, an iron-carbon reactor needs to be added with acid to ensure that the pH inside the tank is stable. In order to reduce the footprint of the iron-carbon reactor, a pipeline mixer can be connected to the outside of the reactor chamber 10 to achieve external acid addition.

[0049] Example 2: The difference between Example 2 and Example 1 is: Figure 8 and Figure 9The relative position of the middle support plate 62 and the gas-liquid inlet pipe 61 is adjustable; the gas-liquid inlet pipe 61 includes an adjusting pipe portion 611 located at the upper part and a gas-liquid inlet portion 612 located at the lower part; the inner diameters of the gas-liquid inlet pipe 61 and the gas-liquid inlet portion 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 portion 612; an external thread is formed on the adjusting pipe portion 611; the connecting nut 64 is screwed on the adjusting pipe portion 611; a coaxially arranged middle connecting screw hole 620 is formed on the middle support plate 62; the adjusting pipe portion 611 is threadedly connected to the middle 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 portion 611, and then screw the adjusting tube portion 611 into the middle connecting screw hole 620 until the connecting nut 64 rests against the bottom surface of the perforated plate 50. In this way, the length of the adjusting tube portion 611 extending into the distribution chamber 630 can be controlled, thereby adjusting the volume of the distribution chamber 630, which can change the pressure in the distribution chamber 630, thereby changing 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.

[0050] In order to prevent the aeration cap 63 from accidentally rotating and affecting the adjustment speed during adjustment, refer to Figure 8 A plurality of limiting posts 623 evenly distributed around the circumference are formed on the bottom surface of the middle support plate 62, and a plurality of limiting insertion holes 501 for the limiting posts 623 to be inserted from top to bottom are formed on the perforated plate 50.

[0051] In order to prevent the connecting nut 64 from accidentally rotating and accidentally changing the length of the regulating tube portion 611 extending into the distribution chamber 630, refer to Figure 8 and Figure 9 A nut stop assembly is provided on the connecting nut 64; the nut stop assembly is used to limit the spiral rotation of the connecting nut 64 along the adjusting tube portion 611, thereby reducing the possibility of misoperation.

[0052] refer to Figure 9At least one radial expansion groove 640 is formed on the inner surface of the connecting nut 64; the nut rotation stop assembly includes a stop pressure block 643 and a radial adjustment screw 642; the stop pressure block 643 is radially movable and arranged in the radial expansion groove 640 and an internal thread portion identical to the internal thread of the connecting nut 64 is formed on the inner wall; a radially arranged external threaded hole 641 is formed on the outer wall of the radial expansion groove 640; the radial adjustment screw 642 passes through and is screwed into the external threaded hole 641; the axial direction of the radial adjustment screw 642 is the same as the moving direction of the stop pressure block 643; in order to facilitate the rotation of the radial adjustment screw 642, a regular hexagonal groove-shaped rotation drive groove is formed on the outer end surface of the radial adjustment screw 642; when the connecting nut 64 is rotated to the appropriate position, the internal thread portion presses against the external thread portion of the adjustment 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 pressure block 643. When the stop pressure block 643 does not play a limiting role, the tension spring pulls the stop pressure block 643 outward and separates it from the external threaded portion of the adjusting tube 611, reducing the impact on the external threaded portion of the adjusting tube 611.

[0053] Of course, at least one radial bolt can also be directly threaded radially onto the connecting nut 64. When the connecting nut 64 needs to be stopped, the radial bolt is rotated so that it rotates inward and rests against the external threaded portion of the adjusting tube 611. In order to reduce accidental damage to the external threaded portion on the adjusting tube 611, a soft damping part, such as a rubber block, can be fixed on the inner end of the radial bolt.

[0054] Example 3: The difference between Example 3 and Example 1 is: Figure 10 The middle support plate 62 is connected to the gas-liquid inlet pipe 61 as a whole, and the aeration cap 63 and the middle support plate 62 are arranged to slide relative to each other vertically; the second aeration element 60 is connected to the perforated plate 50 through the middle support plate 62.

[0055] refer to Figure 10The stop bar 631 includes an arc 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 arc 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 stop bar 631 is connected to the connecting bottom ring 633; ​​the middle support plate 62 is formed with a plurality of vertical sliding members for the vertical movement of the vertical portion 6312 Hole 622; a sealing ring is provided in the vertical sliding hole 622 so that the vertical portion 6312 can slide vertically and sealed in the vertical sliding hole 622; an adjusting nut 66 is screwed on the gas-liquid inlet pipe 61; a rotating groove is formed on the adjusting nut 66 to cooperate with the connecting bottom ring 633; ​​the connecting bottom ring 633 is coaxially connected to the adjusting nut 66 by means of 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.

[0056] refer to Figure 10 A plurality of connecting screws 621 are formed on the bottom surface of the middle support plate 62; a plurality of side connecting holes 502 are formed on the perforated plate 50; the side connecting holes 502 correspond to the connecting screws 621 one by one; the connecting screws 621 pass through the side connecting holes 502 on the corresponding side from top to bottom and are screwed with connecting nuts 64.

[0057] In order to cope with the variable water quality and water conditions of concentrated organic water, the water inlet end of the water inlet pipe of the high-efficiency iron-carbon reactor and the water outlet end of the exhaust and drainage assembly of Examples 1 to 3 can be connected to other reactors through flanges to form a wastewater treatment equipment. For example, the water inlet end of the water inlet pipe of the high-efficiency iron-carbon reactor is connected to the warm hydrolysis reactor, and the water inlet end of the water inlet pipe is connected to the Fenton reactor. The wastewater treatment equipment thus formed is used to remove AOX and COD in the wastewater. After the wastewater reacts in the medium-temperature hydrolysis reactor, it enters the high-efficiency iron-carbon reactor through the lifting water pump, and then the first aeration device 30 is turned on and the exhaust pipe 14 is opened. After a residence time of 8 hours, the water is discharged from the outlet weir 80 to the Fenton reactor. The AOX removal rate of this wastewater treatment equipment is more than 90%, and the COD removal rate is more than 60%.

[0058] 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, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-efficiency iron-carbon reactor for pre-treatment of organic wastewater, comprising a reactor chamber (10), a first aeration device (30), a water and air distribution device (40), and an iron-carbon filler (70); the bottom of the reactor chamber (10) is connected to a water inlet pipe (11), and the top is connected to 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 filler (70) are arranged in the reactor chamber (10) from bottom to top; and characterized in that: The water and gas distribution device (40) includes a perforated plate (50) fixed in the reactor chamber (10) and a plurality of second aeration elements (60) uniformly distributed on the perforated plate (50); the gas-liquid mixture passes through the perforated plate (50) through the second aeration element (60) and reaches the iron-carbon filler (70); the second aeration element (60) includes 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) has a gas-liquid inlet (610); the aeration cap (63) has a plurality of circumferentially uniformly distributed ribs (631) and gas-liquid slits (632) are formed between adjacent ribs (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).

2. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 1, characterized in that: The second aeration element (60) comprises an annular intermediate support plate (62) located between the aeration cap (63) and the gas-liquid inlet pipe (61); a distribution cavity (630) is formed between the intermediate support plate (62) and the aeration cap (63); and a bottom cross-section of the distribution cavity (630) is larger than a cross-section of the gas-liquid inlet pipe (61).

3. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 2, characterized in that: The volume of the distribution chamber (630) is adjustable.

4. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 3, characterized in that: The upper portion of the gas-liquid inlet pipe (61) forms an adjusting pipe portion (611); the adjusting pipe portion (611) passes through the perforated plate (50) and the intermediate support plate (62) in sequence; the adjusting pipe portion (611) and the intermediate support plate (62) are coaxially arranged and threadedly connected; a connecting nut (64) is threadedly connected to the adjusting pipe portion (611); the connecting nut (64) and the intermediate support plate (62) clamp the perforated plate (50).

5. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 4, characterized in that: A nut rotation-stopping assembly is provided on the connecting nut (64); the nut rotation-stopping assembly is used to limit the spiral rotation of the connecting nut (64) along the adjusting tube portion (611).

6. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 3, characterized in that: The stop bar (631) includes an arc portion (6311) and a vertical portion (6312) arranged from top to bottom; the aeration cap (63) also includes an annular connecting bottom ring (633); the bottom of the stop bar (631) is connected to the connecting bottom ring (633); the gas-liquid inlet pipe (61) and the intermediate support plate (62) are connected as a whole; the intermediate support plate (62) is formed with a plurality of vertical sliding holes (622) for vertical movement of the vertical portion (6312); an adjusting nut (66) is screwed onto the gas-liquid inlet pipe (61); the connecting bottom ring (633) is coaxially rotatably connected to the adjusting nut (66); the aeration cap (63) vertically passes through the perforated plate (50); and the intermediate support plate (62) is detachably connected to the perforated plate (50).

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

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

9. The high-efficiency iron-carbon reactor for pretreatment of organic wastewater according to claim 1, characterized in that: A perforated plate limiting device (20) is provided in the reactor chamber body (10); the perforated plate limiting device (20) comprises 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 body (10); the perforated plate (50) is located between the lower support frame and the upper pressure frame and is clamped by the two.

10. A wastewater treatment device, characterized in that: It comprises a high-efficiency iron-carbon reactor, a warm hydrolysis reactor and a Fenton reactor as described in any one of claims 1 to 9; the warm hydrolysis reactor is connected to the water inlet end of the water inlet pipe (11); and the Fenton reactor is connected to the water outlet end of the exhaust and drainage component.

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