Internal circulation high volume load IC anaerobic reactor
By using a conical water distributor, spiral guide vanes, swirling guide plates, combined packing materials, and ultrasonic transducers in the IC reactor, the problems of short-circuiting and dead zones caused by uneven water distribution were solved, thus improving the wastewater treatment effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RONGTAI ENVIRONMENTAL PROTECTION ENGINEERING TECHNOLOGY CO LTD
- Filing Date
- 2025-04-21
- Publication Date
- 2026-05-15
AI Technical Summary
Uneven water distribution in existing IC reactors leads to short-circuiting and dead zones, affecting the quality of the effluent.
By using a conical water distributor combined with spiral guide vanes and guide plates with the same direction of rotation, along with a combination of packing material with density gradient and an ultrasonic transducer, a gradually changing aperture and co-directional spiral flow are formed, avoiding short-circuiting and dead zones, and enhancing sludge activation and pollutant reaction.
It achieves uniform water distribution, extends wastewater retention time, improves pollutant degradation efficiency, reduces sludge deposition, and ensures stable effluent quality.
Smart Images
Figure CN224242862U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment, and in particular to an internal circulation high volumetric load IC anaerobic reactor. Background Technology
[0002] The IC reactor is a new generation of high-efficiency anaerobic reactor, also known as an internal circulation anaerobic reactor, which is similar to two UASB reactors connected in series. It consists of two reaction chambers, one above the other. Wastewater flows from bottom to top in the reactor, pollutants are adsorbed and degraded by bacteria, and the purified water flows out from the top of the reactor.
[0003] The existing perforated water distributor in the IC reactor is prone to uneven water distribution, with some sewage flowing out rapidly and other sewage remaining for too long, resulting in local sludge accumulation, short-circuiting and dead zones, which cause pollutants to not be fully degraded and affect the quality of the effluent. Utility Model Content
[0004] The purpose of this invention is to provide an internal circulation high volumetric load IC anaerobic reactor to solve the technical problems in the prior art where uneven water distribution in the mixing zone easily leads to short-circuiting and dead zones, affecting the quality of the effluent.
[0005] To achieve the aforementioned objectives, the technical solution of this utility model is as follows:
[0006] An internal circulation high volumetric loading IC anaerobic reactor includes a shell with an inlet pipe at the lower end and a biogas pipe at the upper end. Inside the shell, from bottom to top, are arranged a mixing zone, a first anaerobic zone, a first three-phase separator, a second anaerobic zone, a second three-phase separator, and a gas-liquid separator. The first and second three-phase separators are respectively equipped with a first and a second upflow pipe connected to the gas-liquid separator. The gas-liquid separator is equipped with a return pipe connected to the mixing zone. A conical water distributor is installed in the mixing zone, with the lower end of the return pipe extending into the conical water distributor. The inlet pipe is connected to the side wall of the conical water distributor. A spiral guide vane is installed inside the conical water distributor, and several water distribution holes are provided on the side wall of the conical water distributor, with the diameter of the bottom water distribution holes smaller than that of the top water distribution holes. The gradually changing hole diameter combined with the spiral guide vane achieves a gradient distribution of inlet water pressure, avoiding short-circuiting, ensuring uniform water distribution, and uniform disturbance of the sludge bed. The high static pressure at the bottom increases local resistance and reduces flow velocity by narrowing the orifice diameter; the low static pressure at the top increases resistance and improves flow rate by widening the orifice diameter. The high flow velocity at the small bottom orifices creates shear force, flushing away sludge deposits; the large top orifices reduce the risk of channel blockage. When influent flow fluctuates significantly, the orifice gradient automatically adjusts the distribution ratio in each zone, minimizing the impact on the microbial community.
[0007] Preferably, guide plates with the same direction of rotation are installed on the outer wall of the return pipe within the mixing zone and on the inner wall of the shell. These guide plates cause the wastewater to rotate in the same direction within the annular space, forming a co-directional spiral flow. This reduces local eddies and energy loss, lowers turbulence intensity, and creates a more stable laminar flow state, thereby avoiding local overload or short-circuiting phenomena. It also extends the wastewater retention time, ensuring sufficient reaction of pollutants. Furthermore, the co-directional spiral guides the wastewater along a fixed path, eliminating dead zones and reducing the risk of sludge deposition.
[0008] Preferably, the mixing zone is equipped with three layers of combined packing material, the density of which gradually decreases from the bottom to the top. Combined with the suspended sludge bed, this forms a fixed and suspended composite biofilm, improving sludge retention efficiency. The density gradient adjustment reduces biofilm detachment when COD fluctuates significantly, enhancing shock resistance and minimizing sludge loss. The lower high-density packing material retains large sludge particles, the middle layer promotes biofilm formation, and the upper low-density packing material provides space for microbial attachment.
[0009] Preferably, the combined packing includes a packing frame, on which an activated carbon layer, a ceramic layer, and a suspended ball layer are arranged sequentially from bottom to top.
[0010] Preferably, the second anaerobic zone is equipped with multiple layers of baffles, with the upper and lower layers of baffles arranged alternately, and flow channels formed between adjacent baffles in the same layer. The baffles create a baffle-vortex composite flow pattern, which prolongs the residence time of wastewater in the second anaerobic zone and improves the COD removal rate.
[0011] Preferably, the baffle plate is V-shaped with its opening facing the inner wall of the housing.
[0012] Preferably, an ultrasonic transducer is installed below the combined packing material, and a sleeve is provided on the outside of the ultrasonic transducer. The ultrasonic waves generated by the ultrasonic transducer produce microbubbles in the liquid. When the bubbles collapse, they release local high temperature and high pressure, which directly destroys the recalcitrant organic matter and decomposes it into CO2, H2O and small molecule inorganic substances. At the same time, the ultrasonic vibration loosens the sludge particles attached to the surface of the packing material, reducing clogging.
[0013] The beneficial effects of this utility model are:
[0014] 1. This utility model integrates a conical water distributor and an ultrasonic transducer in the mixing zone to enhance influent mixing and sludge activation; the gradually varying orifice size combined with a spiral guide vane achieves a gradient distribution of influent pressure, with high static pressure at the bottom. By reducing the orifice size, local resistance is increased, and the flow velocity is reduced; the static pressure at the top is low, and the orifice size is enlarged to reduce resistance and increase flow rate. The high flow velocity in the small orifices at the bottom creates shear force, flushing away sludge deposits; the large orifices at the top reduce the risk of channel blockage.
[0015] 2. The guide plates with the same rotation direction make the sewage rotate in the same direction in the annular space, forming a co-directional spiral flow, reducing local eddies and energy loss, reducing turbulence intensity, forming a more stable laminar flow state, and thus avoiding local overload or short-circuiting phenomena; it can also extend the sewage retention time, ensuring that pollutants react fully, and the co-directional spiral guides the sewage to flow along a fixed path, eliminating dead corners and reducing the risk of sludge deposition.
[0016] 3. Use a combination of packing materials with density gradients. The lower layer of high-density packing material traps large sludge particles, the middle layer promotes biofilm formation, and the upper layer of low-density packing material provides space for microbial attachment.
[0017] 4. The V-shaped baffle plate extends the hydraulic residence time and improves the COD removal rate. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the structure of this utility model.
[0019] Figure 2 This is a schematic diagram of the structure of a conical water distributor and a spiral guide vane.
[0020] In the picture:
[0021] 1. Shell; 11. Inlet pipe; 12. Outlet pipe; 13. First upflow pipe; 14. Second upflow pipe; 15. Return pipe; 16. Biogas pipe; 17. Baffle plate; 2. Mixing zone; 21. Conical water distributor; 22. Spiral guide vane; 23. Water distribution hole; 3. First anaerobic zone; 4. First three-phase separator; 5. Second anaerobic zone; 51. Baffle plate; 6. Second three-phase separator; 7. Gas-liquid separator; 8. Combined packing; 81. Packing frame; 82. Activated carbon layer; 83. Ceramic layer; 84. Suspended ball layer; 9. Ultrasonic transducer. Detailed Implementation
[0022] The technical solutions in the embodiments of this utility model will now be clearly and completely described with reference to the accompanying drawings.
[0023] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
[0024] Example 1
[0025] like Figure 1As shown, an internal circulation high volumetric loading IC anaerobic reactor includes a shell 1. Inside the shell 1, from bottom to top, are arranged a mixing zone 2, a first anaerobic zone 3, a first three-phase separator 4, a second anaerobic zone 5, a second three-phase separator 6, and a gas-liquid separator 7. An inlet pipe 11, communicating with the mixing zone 2, is located on the lower side wall of the shell 1. A biogas pipe 16, communicating with the gas-liquid separator 7, is located at the top. An outlet pipe 12, communicating with the upper part of the second three-phase separator 6, is located on the upper side wall. Inside the shell 1, there are a first upflow pipe 13, a second upflow pipe 14, and a return pipe 15. The two ends of the first upflow pipe 13 are connected to the first three-phase separator 4 and the gas-liquid separator 7, respectively. The two ends of the second upflow pipe 14 are connected to the second three-phase separator 6 and the gas-liquid separator 7, respectively. The two ends of the return pipe 15 are connected to the mixing zone 2 and the gas-liquid separator 7, respectively.
[0026] like Figure 1 and Figure 2 As shown, a conical water distributor 21 is provided in the mixing zone 2. The lower end of the return pipe 15 passes through the conical water distributor 21. The inlet pipe 11 is connected to the side wall of the conical water distributor 21. A spiral guide vane 22 is provided inside the conical water distributor 21. Several water distribution holes 23 are provided on the side wall of the conical water distributor 21, and the diameter of the bottom water distribution hole 23 is smaller than that of the top water distribution hole 23. The diameter of the bottom water distribution hole 23 is preferably 5 mm, and the diameter of the top water distribution hole 23 is preferably 8 mm.
[0027] like Figure 1 As shown, guide plates 17 with the same rotation direction are provided on the outer wall of the reflux pipe 15 in the mixing zone 2 and on the inner wall of the shell 1.
[0028] like Figure 1 As shown, the mixing zone 2 is equipped with a three-layer composite packing material 8, with the density of the composite packing material 8 gradually decreasing from the bottom layer to the top layer. The composite packing material 8 includes a packing frame 81, on which, from bottom to top, are arranged an activated carbon layer 82, a ceramic layer 83, and a suspended ball layer 84. The density of the upper layer is 30-50 kg / m³. 3 Middle layer 80-100kg / m 3 The lower layer weighs 120-150 kg / m³ 3 An ultrasonic transducer 9 is installed below the combined packing material 8. The ultrasonic transducer 9 is a piezoelectric ceramic type, such as PZT-4, with a water pressure resistance ≥1MPa, a frequency of 28-40kHz, and a power density of 0.8-1.5W / cm³. 2 To adapt to wastewater environments, the ultrasonic transducer 9 is equipped with a sleeve on the outside. The sleeve is made of PVDF corrosion-resistant material to prevent biofilm adhesion from affecting sound wave transmission.
[0029] like Figure 1As shown, the second anaerobic zone 5 is equipped with multiple layers of baffles 51, with upper and lower layers of baffles 51 arranged alternately. Adjacent baffles 51 in the same layer form flow channels with a width of 200-300 mm, forming a baffle-vortex composite flow pattern. The baffles 51 are V-shaped, with their openings facing the inner wall of the shell 1.
[0030] In summary,
[0031] Wastewater enters the conical distributor 21 through the inlet pipe 11. Under the action of the spiral guide vane 22, the wastewater is discharged from the distribution hole 23. The discharged wastewater mixes with suspended sludge in the mixing zone 2, and after passing through the combined packing material 8, most of the organic matter is converted into biogas. The upflow of the mixed liquid and the intense disturbance of biogas cause the sludge in the mixing zone 2 to expand and fluidize, enhancing the surface contact between the sludge and water, thus maintaining the high activity of the sludge. As the biogas production increases, a portion of the sludge-water mixture is lifted through the first upflow pipe 13 to the gas-liquid separator 7 at the top under the action of biogas. The biogas in the lifted mixture is separated from the sludge and water here and discharged from the treatment system. The sludge-water mixture returns to the conical distributor 21 along the return pipe 15, where it is fully mixed with the inlet water, realizing the internal circulation of the mixed liquid.
[0032] The wastewater treated in the first anaerobic zone 3, except for a portion that is lifted into biogas, enters the second anaerobic zone 5 through the first three-phase separator 4, and then flows into the second three-phase separator 6 through the flow channel of the baffle plate 51. The sludge concentration in this zone is low, and most of the organic matter in the wastewater has already been degraded in the first anaerobic zone 3, therefore the biogas production is relatively small. The biogas is introduced into the gas-liquid separator 7 through the second riser pipe 14.
[0033] After the sludge-water mixture in the second anaerobic zone 5 undergoes solid-liquid separation in the second three-phase separator 6, the supernatant is discharged through the effluent pipe 12, and the settled granular sludge is returned to the sludge bed in the second anaerobic zone 5.
[0034] The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.
Claims
1. A high-volume-load IC anaerobic reactor with internal circulation, comprising a shell, an inlet pipe at the lower end of the shell, and a biogas pipe at the upper end; wherein, from bottom to top, the shell comprises a mixing zone, a first anaerobic zone, a first three-phase separator, a second anaerobic zone, a second three-phase separator, and a gas-liquid separator; the first three-phase separator and the second three-phase separator are respectively provided with a first upflow pipe and a second upflow pipe communicating with the gas-liquid separator; and the gas-liquid separator is provided with a return pipe communicating with the mixing zone; characterized in that, The mixing zone is equipped with a conical water distributor. The lower end of the return pipe is inserted into the conical water distributor. The inlet pipe is connected to the side wall of the conical water distributor. The conical water distributor is equipped with a spiral guide vane. Several water distribution holes are provided on the side wall of the conical water distributor, and the diameter of the water distribution holes at the bottom is smaller than that of the water distribution holes at the top.
2. The internal circulation high volumetric loading IC anaerobic reactor according to claim 1, characterized in that, The return pipe is provided with guide plates with the same direction of rotation on the outer wall of the mixing zone and the inner wall of the shell.
3. The internal circulation high volumetric loading IC anaerobic reactor according to claim 2, characterized in that, The mixing zone is provided with three layers of combined packing material, and the density of the combined packing material gradually decreases from the bottom layer to the top layer.
4. The internal circulation high volumetric loading IC anaerobic reactor according to claim 3, characterized in that, The combined packing includes a packing frame, on which an activated carbon layer, a ceramic layer, and a suspended ball layer are arranged sequentially from bottom to top.
5. The internal circulation high volumetric loading IC anaerobic reactor according to claim 4, characterized in that, The second anaerobic zone is equipped with multiple layers of baffles, with upper and lower layers of baffles arranged alternately, and flow channels formed between adjacent baffles in the same layer.
6. The internal circulation high volumetric loading IC anaerobic reactor according to claim 5, characterized in that, The baffle plate is V-shaped with its opening facing the inner wall of the shell.
7. The internal circulation high volumetric loading IC anaerobic reactor according to claim 5, characterized in that, An ultrasonic transducer is installed below the combined packing material, and a sleeve is provided on the outside of the ultrasonic transducer.