A coking wastewater advanced treatment device

Abstract

The application relates to a coking wastewater advanced treatment device, which comprises an aerobic tank, a horizontal shaft is arranged in the aerobic tank along the water flow direction, a plurality of coaxial rotating discs are arranged on the shaft at intervals, the rotating disc is hollow, the surface of the rotating disc is hollowed out, and the rotating disc is filled with bacteria culture fillers; a screw rod is arranged at the bottom of the inner side of the aerobic tank, the screw rod is parallel to the shaft, the same side ends of the shaft and the screw rod pass out of the aerobic tank, and the passing-out end of the shaft is in transmission connection with the passing-out end of the screw rod; a sludge discharge pipe is arranged at the bottom of the side wall of the aerobic tank, a vertical scraper is arranged at the bottom of the inner side of the aerobic tank, screw holes are arranged on the scraper, and the screw rod is matched with the screw holes. The bacteria film and the attachments on the surface of the fillers can be stripped through mutual collision and friction between the fillers, so that water flow exchange in and out of the fillers is smoother.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a deep treatment device for coking wastewater. Background Technology

[0002] Coking wastewater mainly comes from coke refining, coal gas purification and coking by-product recovery. It contains a large amount of macromolecular recalcitrant organic matter and high concentrations of ammonia nitrogen. The conventional biological treatment method is to use an anoxic-aerobic system, i.e., the O / A system or its variants, which treats the wastewater by sequentially using anaerobic bacteria in the anoxic tank and aerobic bacteria in the aerobic tank. The carrier for aerobic bacteria can be activated sludge or porous culture media.

[0003] The advantage of using porous bacterial culture media is that it can provide more surface area for microorganisms to attach, and the media can adsorb suspended solids in wastewater. However, when using porous bacterial culture filter media, as microorganisms multiply, not only will sludge deposits be generated on the surface of the media, but a bacterial film will also be formed, which will prevent wastewater from exchanging inside and outside the media and reduce the microbial treatment efficiency of the aerobic tank.

[0004] In addition, some existing literature points out that the effluent treated by the biological system still contains some toxic substances that are difficult to degrade, such as total cyanide and polycyclic aromatic hydrocarbons. Therefore, an electrolytic cell is added after the biological system. The cell has an anode plate and a cathode plate. The remaining toxic substances are treated by the electrolytic reaction of oxygen, catalyst and motor in the electrolytic cell. However, some dirt will adhere to the electrode plate after the reaction, which will affect the treatment efficiency of electrocatalytic oxidation. Summary of the Invention

[0005] To address the problems existing in the above-mentioned technologies, the present invention provides a deep treatment device for coking wastewater, comprising an aerobic tank, a horizontal shaft arranged along the water flow direction inside the aerobic tank, a plurality of coaxial turntables spaced apart on the shaft, the turntables being hollow with perforated surfaces and filled with bacterial culture packing; a screw is arranged at the bottom inner side of the aerobic tank, the screw being parallel to the shaft, the same-side ends of the shaft and the screw extending out of the aerobic tank, and the extending ends of the shaft and the screw being drively connected; a sludge discharge pipe is arranged at the bottom sidewall of the aerobic tank, and a vertical scraper is arranged at the bottom inner side of the aerobic tank, the scraper having screw holes, and the screw engaging with the screw holes.

[0006] The aerobic tank has a semi-circular internal cross-section, and a settling trough is provided at the bottom of the aerobic tank. The settling trough extends along the axis of the shaft. The sludge discharge pipe is connected to the settling trough. The scraper is located inside the settling trough.

[0007] The settling tank is equipped with a guide rod, which is parallel to the screw, and the scraper is slidably connected to the guide rod.

[0008] The turntable has adjacent scraper bars on both sides.

[0009] It also includes an electrolytic cell, which is equipped with two vertical electrode plates, namely an anode plate and a cathode plate, and is used to further treat the effluent from the aerobic tank.

[0010] The electrolytic cell has two fixed pipes on its side wall, through which water from the aerobic tank is fed into the electrolytic cell. The two fixed pipes are directly opposite the two electrode plates, and the electrode plates are parallel to the axis of the fixed pipes. A vertical rotating rod is fixedly installed on the top of the electrode plate, and a driving device is mounted on the top of the electrolytic cell to drive the electrode plate to rotate.

[0011] The fixed tube is fitted with a movable tube on its outer side. Multiple through holes are spaced apart along the axial direction on the sidewalls of both the fixed tube and the movable tube. The length of the movable tube is less than the length of the fixed tube. A door panel is provided at the end of the movable tube near the electrode plate, and the top of the door panel is pivotally connected to the movable tube. A vertical rod is fixedly installed at the top of the movable tube. A connecting frame is fitted around the rotating rod, and two connecting rods are fixedly installed on both sides of the connecting frame. The end of one connecting rod is pivotally connected to the top of the vertical rod, and the end of the other connecting rod is pivotally connected to the top of the electrode plate. The pivot point at the top of the electrode plate is located on the side of the rotating rod away from the fixed tube.

[0012] The electrode plate includes a vertically arranged frame, and the rotating rod is fixedly arranged on the top of the frame. Two elastic conductive sheets are arranged inside the frame, and the outer edge of the elastic conductive sheets is connected to the inner edge of the frame. A cavity is formed between the two elastic conductive sheets, and the cavity can expand and contract.

[0013] A support plate is provided inside the cavity, and the outer edge of the support plate is fixedly connected to the inner edge of the frame.

[0014] The beneficial effects of this invention are: it can peel off the bacterial film and attached substances on the surface of the packing material through mutual collision and friction between the packing materials, making the water exchange inside and outside the packing material smoother;

[0015] Furthermore, the electrode plates can be cleaned by rotating them. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is the front view of the present invention;

[0018] Figure 2 This is a schematic diagram of the aerobic tank of the present invention;

[0019] Figure 3 This is a cross-sectional view of the aerobic tank of the present invention;

[0020] Figure 4 This is a schematic diagram of the electrolytic cell of the present invention;

[0021] Figure 5 This is a schematic diagram of the fixed tube and the movable tube of the present invention;

[0022] Figure 6 This is a structural diagram of the electrode plate of the present invention.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Aerobic tank; 11. Shaft; 111. Sprocket; 12. Turntable; 121. Scraper; 13. Settling tank; 14. Screw; 15. Guide rod; 16. Scraper; 17. Inlet pipe; 18. Sludge discharge pipe.

[0025] 2. Electrolytic cell;

[0026] 3. Electrode plate; 31. Rotating rod; 32. Connecting frame; 33. Connecting rod;

[0027] 301. Plate frame; 302. Elastic conductive sheet; 303. Support plate;

[0028] 41. Fixed tube; 42. Movable tube; 43. Through hole; 44. Vertical rod; 45. Door panel;

[0029] 5. Water pipes. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] like Figure 1 , Figure 2 and Figure 3 As shown in the embodiment, a coking wastewater deep treatment device is provided, including an aerobic tank 1, which is used to receive the effluent from the anoxic tank in the A / O system of wastewater biochemical treatment;

[0032] A horizontal shaft 11 is installed in the aerobic tank 1 along the water flow direction. Multiple coaxial turntables 12 are installed at intervals on the shaft 11. The turntables 12 are hollow and have open surfaces. They are filled with bacterial culture packing materials, such as spherical polyurethane packing materials, zeolite, and other porous packing materials. The density of the packing material is greater than that of the sewage, and the particle size is 3-5 cm. The packing material is filled no higher than the liquid surface of the aerobic tank 1.

[0033] A screw 14 is installed at the bottom of the inner side of the aerobic tank 1. The screw 14 is parallel to the shaft 11. The ends of the shaft 11 and the screw 14 on the same side protrude from the aerobic tank 1. Both the protruding ends of the shaft 11 and the protruding ends of the screw 14 are equipped with sprockets 111 and are connected by chain drive. The shaft 11 is driven by a motor.

[0034] A sludge discharge pipe 18 is installed at the bottom of the side wall of aerobic tank 1, and a vertical scraper 16 is installed at the bottom of the inner side of aerobic tank 1. A screw hole is provided on the scraper 16, and the screw rod 14 is engaged with the screw hole.

[0035] The aerobic tank 1 has a semi-circular internal cross-section, and a settling trough 13 is provided at the bottom of the bottom surface of the aerobic tank 1, which extends along the axis of the shaft 11.

[0036] The sludge discharge pipe 18 is connected to the settling tank 13. Preferably, there are two sludge discharge pipes 18, which are respectively connected to both ends of the settling tank 13.

[0037] The scraper 16 is located inside the settling tank 13, and can be moved by the drive screw 14.

[0038] A guide rod 15 is provided in the settling tank 13. The guide rod 15 is parallel to the screw 14. A guide hole is provided on the scraper 16. The guide rod 15 passes through the guide hole and guides the scraper 16.

[0039] Furthermore, adjacent scraper bars 121 are provided on both sides of the turntable 12.

[0040] The working principle of an aerobic tank is as follows:

[0041] The effluent from the anoxic tank enters the aerobic tank 1 through the inlet pipe 17. The aerobic tank 1 is aerated, and the water flows through multiple turntables 12 in sequence. The turntables 12 rotate continuously, and the internal bacterial packing material rolls continuously. Through the mutual collision and friction between the packing materials, the bacterial film and attached substances on the surface of the packing material are peeled off. The peeled bacterial film forms sludge, which settles downward and is guided by the inner side of the aerobic tank 1 to be concentrated in the settling trough 13.

[0042] The turntable 12 rotates in both directions, causing the scraper 16 to reciprocate within the settling trough 13, pushing the sludge in the settling trough 13 toward the sludge discharge pipe 18, and opening the sludge discharge pipe 18 to discharge the sludge.

[0043] Since the wastewater still contains high levels of total cyanide and polycyclic aromatic hydrocarbons after the O / A biological treatment system, it can be further treated with electrocatalytic oxidation, such as... Figure 1 , Figures 4 to 6 As shown, it also includes an electrolytic cell 2, which is located downstream of the aerobic tank 1 and is connected to the aerobic tank 1 via a water pipe 5. A water pump supplies water to the water pipe 5. Two vertical electrode plates 3 are installed in the electrolytic cell 2, which are the anode plate and the cathode plate, respectively. The biochemical effluent from the aerobic tank 1 is further treated by electrocatalytic oxidation in the electrolytic cell 2 to remove total cyanide and polycyclic aromatic hydrocarbons, so as to meet the standard of GB16171-2012.

[0044] However, during the electrocatalysis process, the electrode plates will gradually be loaded with deposits, which will affect the electrocatalysis efficiency. Therefore, two fixed pipes 41 can be set on the side wall of the electrolytic cell 2. The water in the aerobic tank 1 is pumped into the fixed pipes 41 through the water pipe 5 and then input into the electrolytic cell 2.

[0045] Two fixed tubes 41 are directly opposite to two electrode plates 3, and the electrode plates 3 are parallel to the axis of the fixed tubes 41.

[0046] A vertical rotating rod 31 is fixedly installed on the top of the electrode plate 3. A driving device, which can be two motors, is installed on the top of the electrolytic cell 2. The output shafts of the two motors drive the two rotating rods 31 to rotate, thereby controlling the rotation of the electrode plate 3.

[0047] A movable tube 42 is sleeved on the outside of the fixed tube 41. Multiple through holes 43 are provided at intervals along the axial direction on the side walls of the fixed tube 41 and the movable tube 42. The length of the movable tube 42 is less than the length of the fixed tube 41. A door plate 45 is provided at one end of the movable tube 42 near the electrode plate 3. The top end of the door plate 45 is pivotally connected to the movable tube 42. Preferably, a torsion spring (not shown) can be provided on the pivot shaft. One leg of the torsion spring is connected to the door plate 45, and the other leg is connected to the outer wall of the movable tube 42. When the door plate 45 is closed, the torsion spring is not under force.

[0048] A vertical rod 44 is fixedly installed at the top of the movable tube 42;

[0049] A connecting frame 32 is fitted around the rotating rod 31. Two connecting rods 33 are fixedly installed on both sides of the connecting frame 32. The end of one connecting rod 33 is pivotally connected to the top of the vertical rod 44, and the end of the other connecting rod 44 is pivotally connected to the top of the electrode plate 3. The pivot point at the top of the electrode plate 3 is located on the side of the rotating rod 31 away from the fixed tube 41.

[0050] When it is necessary to clean the electrode plate 3, rotate the electrode plate 3 counterclockwise by 90 degrees so that the fixed tube 41 is perpendicular to it. During the rotation of the electrode plate 3, the connecting rod 33 drives the vertical rod 44 to move away from the electrode plate 3, which in turn drives the movable tube 42 to move in the same direction. The fixed tube 41 lifts the door panel 45. The through holes 43 on the two tubes are staggered, so that the water flow is concentrated and sprayed out from the water outlet of the fixed tube 41 to rinse the electrode plate 3.

[0051] Afterwards, the electrode plate 3 is reset, which drives the movable tube 42 to move toward the electrode plate 3. The door plate 45 rotates downward under its own weight and the action of the torsion spring, and the through hole 43 on the fixed tube 41 and the movable tube 42 overlap.

[0052] At this time, the door panel 45 can only block part of the water flow and does not need to be completely closed. The water is dispersed through the gaps in the door panel 45 and the through hole 43, so the torsion spring is not necessary.

[0053] Alternatively, with a torsion spring installed, the door panel 45 is fully closed, and the water is dispersed only through the overlapping through-holes 43.

[0054] Then rotate electrode plate 3 90 degrees clockwise and reset it to clean the other side of electrode plate 3.

[0055] Since the deposits on the electrode plate 3 may adhere firmly to form a film or layer, such as scale formed by calcium and magnesium ions on the cathode plate, the electrode plate 3 can be further configured as follows: the electrode plate 3 includes a vertically arranged plate frame 301, and a rotating rod 31 is fixedly arranged on the top of the plate frame 301.

[0056] Two elastic conductive sheets 302 are provided inside the plate frame 301. The outer edge of the elastic conductive sheet 302 is connected to the inner edge of the plate frame 301. The elastic conductive sheet 302 can be made of conductive rubber in the prior art.

[0057] A cavity is provided between the two elastic conductive sheets 302, and a support plate 302 is provided inside the cavity. The outer edge of the support plate 302 is fixedly connected to the inner edge of the plate frame 301, and air holes can be provided on the support plate 302.

[0058] The top of the plate frame 301 is equipped with a connector and an exhaust nozzle, both of which are connected to the interior of the cavity. The exhaust nozzle is equipped with a solenoid valve. Before rotating the electrode plate 3 to clean it, air is injected into the cavity through the connector, causing the two elastic conductive sheets 302 to expand, increasing their outer surface area and creating an arc, which opens up the attached film or layer, and the broken edges of the scale layer are raised. Then, the electrode plate 3 is rotated and rinsed with the water inlet of the electrolytic cell 2. During the rinsing process, some air can be released through the exhaust nozzle. When the water flow impacts the elastic conductive sheets 302, it will cause them to fluctuate, increasing the cleaning effect of the attached film or scale layer. After cleaning, the exhaust nozzle is opened again to completely release the internal gas, and the electrode plate 3 can be returned to its position.

[0059] It should be noted that the scope of protection claimed in this application is the aerobic tank in a conventional O / A system and the electrolytic tank added subsequently;

[0060] However, it's not simply a matter of setting up an oxygenation tank and an electrolysis tank; existing technologies can still be expanded as needed, for example:

[0061] Oil removal tank, settling tank, premixing and equalization tank, etc. in the pretreatment system;

[0062] Alternatively, a conventional settling tank can be added between the aerobic tank and the electrolysis tank.

[0063] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A deep treatment device for coking wastewater, characterized in that, It includes an aerobic tank, in which a horizontal shaft is set along the water flow direction, and multiple coaxial turntables are set at intervals on the shaft. The turntables are hollow, the surface of the turntables is hollowed out, and the turntables are filled with culture medium. A screw is installed at the bottom of the inner side of the aerobic tank. The screw is parallel to the shaft. The ends of the shaft and the screw on the same side protrude from the aerobic tank. The protruding end of the shaft is connected to the protruding end of the screw. A sludge discharge pipe is installed at the bottom of the side wall of the aerobic tank, and a vertical scraper is installed at the bottom of the inner side of the aerobic tank. The scraper has screw holes, and the screw is engaged with the screw holes. It also includes an electrolytic cell, which is equipped with two vertical electrode plates, namely an anode plate and a cathode plate, and the electrolytic cell is used to further treat the effluent from the aerobic tank; Two fixed pipes are installed on the side wall of the electrolytic cell, and water in the aerobic tank is fed into the electrolytic cell through the fixed pipes. The two fixed tubes are directly opposite the two electrode plates, and the electrode plates are parallel to the axis of the fixed tubes; A vertical rotating rod is fixedly installed on the top of the electrode plate, and a driving device is mounted on the top of the electrolytic cell, which can drive the electrode plate to rotate. A movable tube is sleeved on the outside of the fixed tube. Multiple through holes are spaced apart along the axial direction on the sidewalls of the fixed tube and the movable tube. The length of the movable tube is less than the length of the fixed tube. A door plate is provided at one end of the movable tube near the electrode plate. The top of the door plate is pivotally connected to the movable tube. A vertical rod is fixedly installed at the top of the movable tube; A connecting frame is fitted around the rotating rod, and two connecting rods are fixedly installed on both sides of the connecting frame. The end of one of the connecting rods is pivotally connected to the top of the vertical rod, and the end of the other connecting rod is pivotally connected to the top of the electrode plate. The pivot point of the top of the electrode plate is located on the side of the rotating rod away from the fixed tube. The electrode plate includes a vertically arranged plate frame, and the rotating rod is fixedly arranged on the top of the plate frame; Two elastic conductive sheets are provided inside the plate frame, and the outer edge of the elastic conductive sheets is connected to the inner edge of the plate frame. A cavity is provided between the two elastic conductive sheets, and the cavity is capable of expanding and contracting.

2. The deep treatment device for coking wastewater according to claim 1, characterized in that, The aerobic tank has a semi-circular internal cross-section, and a settling trough is provided at the bottom of the bottom surface of the aerobic tank, which extends along the axis of the shaft. The sludge discharge pipe is connected to the settling tank; The scraper is located inside the settling trough.

3. The deep treatment device for coking wastewater according to claim 2, characterized in that, A guide rod is provided inside the settling tank. The guide rod is parallel to the screw, and the scraper is slidably connected to the guide rod.

4. The deep treatment device for coking wastewater according to claim 2, characterized in that, The turntable has adjacent scraper bars on both sides.

5. The deep treatment device for coking wastewater according to claim 1, characterized in that, A support plate is provided inside the cavity, and the outer edge of the support plate is fixedly connected to the inner edge of the frame.

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