High-concentration organic wastewater treatment device

Abstract

The utility model discloses a high-concentration organic wastewater treatment device which comprises a tank body, the top end of the tank body is connected with a water inlet pipe through a rotary water distributor, and the interior of the tank body is divided into an electrolytic catalytic oxidation area, an anaerobic reaction area and a sediment backflow area from top to bottom; the electrolytic catalytic oxidation zone is provided with a plurality of titanium-based electrode plates which are arranged in parallel at intervals, a porous ceramic catalyst is filled between the titanium-based electrode plates, the anaerobic reaction zone is divided into a plurality of reaction chambers by a plurality of baffle plates, the adjacent baffle plates in the vertical direction deviate from each other, the bottoms of the baffle plates are provided with flow guide angles, and the flow guide angles are communicated with the reaction chambers. The reaction chamber is filled with a modified polyurethane biological filler; the precipitation reflux zone comprises an inclined tube precipitation layer and a conical sludge hopper, and the conical sludge hopper is connected with the head end of the anaerobic reaction zone through a gas stripping pipe. The high-concentration organic wastewater treatment device has the advantages of being compact in structure, high in high-concentration organic wastewater treatment efficiency and high in impact resistance.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to a device for treating high-concentration organic wastewater. Background Technology

[0002] High-strength organic wastewater refers to industrial or domestic wastewater with a chemical oxygen demand (COD) concentration typically higher than 2000 mg / L (some industry standards may be even higher). Its core characteristics are high concentration of organic pollutants, significant differences in biodegradability, and the potential presence of toxic substances.

[0003] In the field of industrial wastewater treatment, the treatment technology for high-concentration organic wastewater has long relied on multi-stage series process systems, typically a combination of "electrolytic pretreatment + anaerobic digestion + aerobic biological treatment". However, this technology has the following problems:

[0004] 1. Complex structure: The multi-stage reaction tanks are set up independently, occupying a large area and requiring complicated piping connections.

[0005] 2. Low processing efficiency: The electrolysis unit is separated from the biochemical unit, and pollutants need to be lifted multiple times, resulting in low mass transfer efficiency.

[0006] 3. Weak resistance to shock: High-concentration wastewater directly entering the biological treatment unit can easily lead to the inactivation of microorganisms. Utility Model Content

[0007] In view of the shortcomings of the existing technology, this utility model aims to provide a high-concentration organic wastewater treatment device, which is an integrated wastewater treatment device with compact structure, high treatment efficiency and strong shock resistance. Through the synergistic effect of electrolytic catalytic pretreatment and improved ABR anaerobic reactor, it can reduce chemical oxygen demand and improve biodegradability.

[0008] The present invention provides a high-concentration organic wastewater treatment device, comprising a tank body, wherein the top of the tank body is connected to the inlet pipe via a rotating water distributor, and the tank body is divided into an electrolytic catalytic oxidation zone, an anaerobic reaction zone, and a sedimentation reflux zone from top to bottom.

[0009] The electrolytic catalytic oxidation zone is provided with several parallel and spaced titanium-based electrode plates, and porous ceramic catalyst is filled between the titanium-based electrode plates. The anaerobic reaction zone is divided into multiple reaction chambers by several baffles. The vertically adjacent baffles are offset from each other, and the bottom of the baffles is provided with a guide angle. The reaction chambers are filled with modified polyurethane biological packing. The sedimentation reflux zone includes an inclined tube sedimentation layer and a conical sludge hopper. The conical sludge hopper is connected to the head end of the anaerobic reaction zone through an air lift pipe.

[0010] Furthermore, the rotating water distributor includes an annular pipe and a water distribution spray pipe, wherein the annular pipe is connected to the water inlet pipe via a flange.

[0011] Furthermore, the modified polyurethane biofiller has a honeycomb porous structure with iron-carbon microelectrolysis material loaded on its surface.

[0012] Furthermore, the inclined tube sedimentation layer is composed of multiple PVC hexagonal honeycomb inclined tubes, which have an inclined angle with the horizontal plane, and an overflow assembly including an overflow pipe is provided above the PVC hexagonal honeycomb inclined tubes.

[0013] Furthermore, the air lift pipe connects the bottom of the conical sludge hopper to the beginning of the anaerobic reaction zone, the air inlet of the air lift pipe is connected to the excess oxygen in the electrolytic catalytic oxidation zone, and the air lift frequency of the air lift pipe is controlled by a time relay.

[0014] Furthermore, the top of the electrolytic catalytic oxidation zone is equipped with a pH adjustment agent dosing device, including a pH probe, a metering pump, and a storage tank. The pH probe signal is connected to a PLC controller.

[0015] The beneficial effects of this utility model are:

[0016] 1. This utility model achieves structural integration by vertically integrating the three functions of electrolysis, anaerobic digestion, and precipitation into a single tank. This effectively improves the COD removal rate while reducing the floor space and pipeline connections, thereby reducing costs.

[0017] 2. The ·OH radicals generated by electrolysis in the electrolytic catalytic oxidation zone of this invention continue to participate in the reduction reaction in the ABR zone. This synergistic enhancement treatment can improve the removal rate of recalcitrant organic compounds (such as nitrobenzene).

[0018] 3. By setting the anaerobic reaction zone into a multi-chamber structure, this utility model can buffer water quality fluctuations, thereby enhancing its resistance to shocks.

[0019] 4. By setting up a rotating water distributor and combining it with the flow guide angle of the baffle plate, the contact efficiency between wastewater and electrodes or packing can be improved, thereby achieving efficient water distribution and mass transfer.

[0020] 5. By setting up an air lift pipe to drive sludge return using the residual pressure of aeration, sludge self-return is achieved without the need for additional power equipment, thus saving energy consumption. Attached Figure Description

[0021] Figure 1 A cross-sectional structural schematic diagram of a high-concentration organic wastewater treatment device provided by this utility model;

[0022] Figure 2 A schematic diagram of the anaerobic reaction zone of a high-concentration organic wastewater treatment device provided by this utility model;

[0023] In the diagram: 1. Tank body; 2. Inlet pipe; 3. Rotary water distributor; 3. Ring pipe; 31. Water distribution spray pipe; 32. Electrolytic catalytic oxidation zone; 4. Titanium-based electrode plate; 41. Porous ceramic catalyst; 42. Anaerobic reaction zone; 5. Baffle plate; 51. Reaction chamber; 52. Modified polyurethane biological packing; 53. Guide angle; 54. Sedimentation reflux zone; 6. PVC hexagonal honeycomb inclined tube; 61. Conical sludge hopper; 62. Air lift pipe; 7. Overflow pipe; 8. Sludge discharge valve; 9. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0025] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] This utility model discloses a high-concentration organic wastewater treatment device, including a tank 1. The top of the tank 1 is connected to the inlet pipe 2 through a rotating water distributor 3. The inside of the tank 1 is divided into an electrolytic catalytic oxidation zone 4, an anaerobic reaction zone 5 and a sedimentation reflux zone 6 from top to bottom.

[0028] The electrolytic catalytic oxidation zone 4 is provided with several parallel and spaced titanium-based electrode plates 41, and porous ceramic catalysts 42 are filled between the titanium-based electrode plates 41. The anaerobic reaction zone 5 is divided into multiple reaction chambers 52 by several baffles 51. The vertically adjacent baffles 51 are offset from each other, and the bottom of the baffles 51 is provided with a guide angle 54. The reaction chambers 52 are filled with modified polyurethane biological packing material 53. The sedimentation and reflux zone 6 includes an inclined tube sedimentation layer and a conical sludge hopper 62. The conical sludge hopper 62 is connected to the head end of the anaerobic reaction zone 5 through an air lift pipe 7.

[0029] Specifically, by providing several parallel-spaced titanium-based electrode plates 41 in the electrolytic catalytic oxidation zone 4, with porous ceramic catalyst 42 filling the spaces between the titanium-based electrode plates 41, the electrolytic catalytic efficiency can be effectively improved, and local overload can be avoided. The titanium-based electrode plates 41 in the electrolytic catalytic oxidation zone 4 are coated with ruthenium-iridium oxide, and the porous ceramic catalyst 42 is loaded with nano-titanium dioxide. Uniform water distribution in the electrolytic catalytic oxidation zone 4 can be achieved by arranging a rotating water distributor 3. High-concentration organic wastewater enters the electrolysis zone uniformly through the rotating water distributor 3 and can be decomposed into large-molecule organic matter under the action of the electric field and catalyst. In a specific embodiment, the titanium-based electrode plates 41 can be arranged in parallel with a spacing of 50 mm, the filling rate of the porous ceramic catalyst 42 can be selected as 30% (particle size 5-10 mm), and the rotating water distributor 3 covers a radius of 90% of the tank body 1 diameter.

[0030] Anaerobic reaction zone 5 can specifically be an ABR (Anaerobic Baffled Reactor) anaerobic reaction zone 5, such as... Figure 2 As shown, multiple reaction chambers 52 are divided by several baffles 51, with adjacent baffles 51 offset from each other in the vertical direction. A guide angle 54 is provided at the bottom of each baffle 51. The reaction chambers 52 are filled with modified polyurethane biological packing material 53, which can support anaerobic bacterial biofilms. This allows the electrolyzed water to enter the anaerobic reaction zone along the baffles 51, undergo anaerobic degradation in multiple baffle chambers, and then further adsorb pollutants through the packing biofilm. The guide angle 54 can be set to 40-50°, preferably 45°, to promote hydraulic agitation. By rotating the water distributor 3 in combination with the baffles 51 and the guide angle 54, the contact efficiency between wastewater and the electrodes or packing material can be improved, achieving efficient water distribution and mass transfer.

[0031] Furthermore, a 45° guide angle steel plate is welded to the bottom of the guide plate, and the spacing of the baffles 51 decreases step by step.

[0032] Specifically, the guide angle of 54° forces the water flow to form vortices, thereby prolonging the contact time between sludge and wastewater, reducing the COD removal load in the ABR anaerobic reaction zone 5, and optimizing the hydraulic flow pattern. The upward flow velocity generated by the guide angle of 54° reduces sludge loss and prolongs sludge retention time. The decreasing spacing design balances the volumetric load of each chamber, thereby reducing the difference in COD degradation rate between chambers when the influent flow rate fluctuates significantly, thus enhancing resistance to short-circuiting.

[0033] The sedimentation and reflux zone 6 includes an inclined tube sedimentation layer and a conical sludge hopper 62, which is connected to the beginning of the anaerobic reaction zone 5 via an air lift pipe 7.

[0034] The effluent from the anaerobic reaction zone 5 overflows and is discharged after sedimentation in the inclined tube sedimentation layer, while the settled sludge enters the conical sludge hopper 62. The settled sludge can then be automatically returned to the beginning of the anaerobic reaction zone 5 through the air lift pipe 7 or discharged through the sludge discharge valve 9 at the bottom of the tank 1.

[0035] Specifically, in one optional embodiment, the inclined tube sedimentation layer is composed of a plurality of PVC hexagonal honeycomb inclined tubes 61, the PVC hexagonal honeycomb inclined tubes 61 having an inclined angle with the horizontal plane, and an overflow assembly including an overflow pipe 8 is provided above the PVC hexagonal honeycomb inclined tubes 61.

[0036] The PVC honeycomb inclined tube has an angle of inclination of 55-65° with the horizontal plane, and the overflow assembly may also include an overflow port and an adjustable overflow weir. In this embodiment, by setting the PVC hexagonal honeycomb inclined tube 61 and the overflow assembly, the sedimentation efficiency, resistance to shock loads, and sludge concentration rate can be effectively improved.

[0037] Specifically, the upper end of the PVC honeycomb inclined tube is connected to the overflow pipe 8, and the lower end of the PVC honeycomb inclined tube has a reserved sludge discharge gap, which is connected to the conical sludge hopper 62 by a guide plate to prevent clogging. After sedimentation in the PVC honeycomb inclined tube, the clean water rises and overflows from the top of the PVC honeycomb inclined tube, and then overflows from the overflow pipe 8. The specific installation method of the overflow component and the related overflow principle are existing conventional technologies, and therefore will not be described in detail here.

[0038] This invention integrates electrolysis, anaerobic digestion, and sedimentation into a single tank to achieve structural integration, reducing floor space and piping connections. This provides a compact, efficient, and impact-resistant integrated wastewater treatment device. Furthermore, through the synergistic effect of electrolytic catalytic pretreatment and an improved ABR anaerobic reactor, COD is reduced and biodegradability is improved.

[0039] The auxiliary components of this utility model may also include a pH adjustment agent dosing port provided at the top of the tank 1, a sludge discharge valve 9 provided at the bottom, and a sampling port provided on the side wall.

[0040] In one alternative embodiment, the rotating water distributor 3 includes an annular pipe 31 and a water distribution nozzle 32, with the annular pipe 31 connected to the water inlet pipe 2 via a flange.

[0041] Specifically, the water distribution nozzle 32 is connected to the bottom of the annular pipe 31. By setting the annular pipe 31 and the water distribution nozzle 32, the uniformity of water distribution can be improved, ensuring the flow rate of the electrolytic catalytic oxidation zone 4 is stable, which is beneficial to extending the electrode life. At the same time, it is beneficial to use the centrifugal force of rotation to make suspended matter gather at the outer edge of the water distributor to prevent clogging. In addition, the rotational power can be fully utilized by the pressure energy of the inlet water, which is more energy-efficient than traditional mechanical stirring water distribution.

[0042] In one alternative embodiment, the modified polyurethane biofiller 53 is a honeycomb porous structure with iron-carbon microelectrolysis material loaded on its surface.

[0043] Specifically, the iron-carbon microelectrolysis-supported honeycomb packing material has a pore size of 5-8 mm. In this embodiment, the iron-carbon packing material generates Fe²⁺ and [H], which can break the azo bonds of recalcitrant azo dyes (such as Congo red), thereby increasing the subsequent biodegradation rate and achieving microelectrolysis-assisted biodegradation. Simultaneously, due to the large surface roughness of the packing material, the biofilm shedding rate is correspondingly low, thus ensuring biofilm stability. Furthermore, because iron ions complex with heavy metals, methanogens can maintain high activity even at high Cu²⁺ concentrations, thus enhancing their resistance to toxicity.

[0044] In one alternative embodiment, the air lift pipe 7 connects the bottom of the conical sludge hopper 62 to the beginning of the anaerobic reaction zone 5. The air inlet of the air lift pipe 7 is connected to the excess oxygen in the electrolytic catalytic oxidation zone 4. The air lift frequency of the air lift pipe 7 is controlled by a time relay.

[0045] Specifically, the gas lift pipe 7 is driven by the electrolysis tail gas. The gas lift pipe 7 uses the residual pressure of aeration to drive the sludge return without the need for additional power equipment. Therefore, it can achieve zero-power return, which is beneficial to saving energy consumption. The return frequency can be automatically controlled by controlling the frequency through a time relay.

[0046] In one optional embodiment, a pH adjustment agent dosing device is provided at the top of the electrolytic catalytic oxidation zone 4, including a pH probe, a metering pump and a storage tank, and the pH probe signal is connected to a PLC controller.

[0047] Specifically, the linkage between the pH probe and the metering pump is beneficial for real-time control of the pH of the electrolytic catalytic oxidation zone 4, thereby ensuring the stability of the pH value of the electrolytic catalytic oxidation zone 4 and protecting the electrode; at the same time, the reaction efficiency of the electrolytic catalytic oxidation zone 4 can be improved by adjusting the pH value to a suitable reaction range.

[0048] The working process of this utility model is as follows:

[0049] High-concentration organic wastewater enters the catalytic oxidation zone evenly through the inlet pipe 2 and the rotating water distributor 3. Under the action of the electric field generated by the titanium-based electrode plate 41 and the porous ceramic catalyst 42, it is decomposed into large molecular organic matter. After electrolysis, the wastewater enters the anaerobic reaction zone 5 along the baffle plate 51. It undergoes anaerobic degradation in the multi-stage baffle reaction chamber 52, where the modified polyurethane biological packing 53 further adsorbs pollutants. Afterward, it enters the sedimentation and reflux zone 6. After sedimentation in the inclined tube sedimentation layer, the purified water overflows and is discharged through the overflow pipe 8. The settled sludge can be automatically returned to the beginning of the anaerobic reaction zone 5 through the air lift pipe 7 or discharged through the sludge discharge valve 9 at the bottom of the tank 1.

[0050] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for treating high-concentration organic wastewater, characterized in that, It includes a tank (1), the top of which is connected to the water inlet pipe (2) via a rotating water distributor (3). The tank (1) is divided into an electrolytic catalytic oxidation zone (4), an anaerobic reaction zone (5), and a sedimentation reflux zone (6) from top to bottom. The electrolytic catalytic oxidation zone (4) is provided with several parallel and spaced titanium-based electrode plates (41), and porous ceramic catalysts (42) are filled between the titanium-based electrode plates (41). The anaerobic reaction zone (5) is divided into multiple reaction chambers (52) by several baffles (51). The baffles (51) adjacent to each other in the vertical direction are offset from each other. The bottom of the baffles (51) is provided with a guide angle (54). The reaction chambers (52) are filled with modified polyurethane biological packing material (53). The sedimentation reflux zone (6) includes an inclined tube sedimentation layer and a conical sludge hopper (62). The conical sludge hopper (62) is connected to the head end of the anaerobic reaction zone (5) through an air lift pipe (7).

2. The high-concentration organic wastewater treatment device according to claim 1, characterized in that, The rotating water distributor (3) includes an annular pipe (31) and a water distribution nozzle (32), and the annular pipe (31) is connected to the water inlet pipe (2) through a flange.

3. The high-concentration organic wastewater treatment device according to claim 1, characterized in that, The modified polyurethane biofiller (53) has a honeycomb porous structure with iron-carbon microelectrolysis material loaded on its surface.

4. The high-concentration organic wastewater treatment device according to claim 1, characterized in that, The inclined tube sedimentation layer is composed of multiple PVC hexagonal honeycomb inclined tubes (61), the PVC hexagonal honeycomb inclined tubes (61) have an inclined angle with the horizontal plane, and an overflow assembly including an overflow pipe (8) is provided above the PVC hexagonal honeycomb inclined tubes (61).

5. The high-concentration organic wastewater treatment device according to claim 1, characterized in that, The air lift pipe (7) connects the bottom of the conical sludge hopper (62) to the head of the anaerobic reaction zone (5). The air inlet of the air lift pipe (7) is connected to the excess oxygen in the electrolytic catalytic oxidation zone (4). The air lift frequency of the air lift pipe (7) is controlled by a time relay.

6. The high-concentration organic wastewater treatment device according to claim 1, characterized in that, The top of the electrolytic catalytic oxidation zone (4) is equipped with a pH adjustment agent dosing device, including a pH probe, a metering pump and a storage tank. The pH probe signal is connected to the PLC controller.

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