Cardboard paper wastewater treatment device

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a cardboard paper wastewater treatment device, which comprises an anaerobic reactor, the anaerobic reactor is provided with an anaerobic water inlet pipeline and an anaerobic water outlet pipeline, the anaerobic water inlet pipeline is communicated with a sludge feeding pump, the sludge feeding pump is communicated with an aerobic excess sludge tank, and the aerobic excess sludge tank is communicated with a sludge discharge pipeline. And the aerobic excess sludge tank is used for storing and culturing excess sludge from the aerobic system. According to the anaerobic treatment process for treating the cardboard paper wastewater by adopting the flocculent sludge instead of conventional granular sludge, the problems of sludge calcification and pipeline scaling are not easy to occur, and the flocculent sludge comes from an aerobic system, does not need to be purchased and can be timely discharged and subjected to pressure filtration.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a device for treating boxboard wastewater. Background Art

[0002] Containerboard, a widely used material in the packaging industry, is commonly known as kraft paper or kraft paper due to its toughness and durability. It is an essential paper type for various cartons. It not only protects goods and facilitates transportation, but also plays a vital role in modern logistics. However, wastewater treatment in the containerboard production process has become a pressing environmental issue.

[0003] A notable characteristic of containerboard wastewater is its high chemical oxygen demand (COD) concentration, a direct reflection of the abundance of organic matter in the wastewater, which significantly impacts water quality. To effectively treat this wastewater, anaerobic systems are widely used as a primary treatment process. Their core approach is to utilize granular sludge, a specialized biomass aggregate. Granular sludge not only boasts a high biomass density and excellent settling properties, but also efficiently decomposes organic matter in an anaerobic environment, converting it into usable gases like methane, thereby reducing wastewater volume and maximizing its resource utilization.

[0004] However, the high calcium ion concentration in containerboard wastewater poses a challenge to this treatment process. Calcium ions in water easily combine with dissolved carbonate, sulfate, and other ions, forming insoluble calcium salt precipitates. In anaerobic systems, these calcium salt precipitates not only cause the surface of the granular sludge to gradually calcify, affecting the activity and structural stability of the sludge, but may also clog the pipes and the interior space of the reactor, causing poor system operation and increased maintenance costs. More seriously, as the degree of granular sludge calcification deepens and pipe scaling intensifies, the efficiency of removing organic matter from the wastewater will be significantly reduced, failing to achieve the expected treatment effect, and may cause secondary pollution to the environment. Utility Model Content

[0005] In order to solve the technical problems in the prior art of using granular sludge for anaerobic treatment of containerboard wastewater, which easily leads to calcification of granular sludge and scaling of pipelines, the utility model provides a containerboard wastewater treatment device.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for treating boxboard wastewater includes an anaerobic reactor. The anaerobic reactor is provided with an anaerobic water inlet pipe and an anaerobic water outlet pipe. The anaerobic water inlet pipe is connected to a sludge dosing pump. The sludge dosing pump is connected to an aerobic excess sludge tank. The aerobic excess sludge tank is used to store and cultivate excess sludge from an aerobic system.

[0008] Using this structural solution, excess sludge from the aerobic system is inoculated into an aerobic excess sludge tank for temporary storage. After simple acclimatization and cultivation, it is introduced into the anaerobic reactor via a sludge dosing pump and anaerobic water inlet pipe, where the containerboard wastewater inside the anaerobic reactor is anaerobically treated. This application utilizes flocculent sludge instead of conventional granular sludge to treat containerboard wastewater. This anaerobic treatment process is less prone to sludge calcification and pipe scaling. Furthermore, the flocculent sludge is derived from the aerobic system, eliminating the need for external procurement and enabling timely discharge and filtration.

[0009] As a preferred implementation method of a device for treating boxboard wastewater, a suspended matter detector is provided on the outlet path of the anaerobic outlet pipe. The suspended matter detector is communicatively connected to the controller, the controller is communicatively connected to the flocculant dosing device, the flocculant dosing device is connected to the flocculant dosing pipe, and the flocculant dosing pipe is connected to the anaerobic inlet pipe.

[0010] By adopting the above structural scheme, the suspended solids concentration in the anaerobically treated wastewater is detected online in real time by the effluent suspended solids detector. If the suspended solids concentration is too high, the controller sends a dosing signal to the flocculant dosing device. The flocculant dosing device introduces flocculant into the anaerobic water inlet pipe through the flocculant dosing pipe, so that the suspended solids in the anaerobic reactor are aggregated, which is convenient for separation and reduces the suspended solids in the anaerobically treated wastewater.

[0011] As a preferred implementation of a containerboard wastewater treatment device, the flocculant dosing device includes a flocculant automatic configuration device and a flocculant dosing pump. The controller is communicatively connected to the flocculant dosing pump, and the flocculant dosing pump is arranged on the path of the flocculant dosing pipeline.

[0012] With the above structural solution, the controller controls the addition of flocculant by controlling the switch of the flocculant addition pump.

[0013] As a preferred implementation of a containerboard wastewater treatment device, the anaerobic effluent pipe is connected to the inclined plate sedimentation tank, the inclined plate sedimentation tank is provided with a sludge discharge pipe, the sludge discharge pipe is connected to the sludge return pump, and the sludge return pump is connected to the anaerobic inlet pipe.

[0014] When the anaerobic reactor discharges water, some sludge will be lost with the flowing water. By adopting the above structural scheme, the lost sludge can be precipitated and recovered in the inclined plate sedimentation tank. The lost sludge will return to the anaerobic reactor through the sludge return pump and the anaerobic water inlet pipe, thereby improving the sludge utilization rate.

[0015] As a preferred implementation of a containerboard wastewater treatment device, the inclined plate sedimentation tank is provided with a separation water outlet pipe, a suspended matter detector is arranged on the outlet path of the separation water outlet pipe, and the separation water outlet pipe is used to connect with the aerobic system.

[0016] As a preferred implementation of a device for treating boxboard wastewater, the bottom of the inclined plate in the inclined plate sedimentation tank is inclined downward toward the side close to the anaerobic reactor, and the sludge discharge pipe is arranged at the bottom of the inclined plate sedimentation tank close to the anaerobic reactor; the separated water outlet pipe is arranged at the top of the inclined plate sedimentation tank away from the anaerobic reactor.

[0017] The above structural solution is conducive to sedimentation and recovery of sludge.

[0018] The beneficial effects of the utility model include:

[0019] The present application adopts flocculent sludge instead of conventional granular sludge to treat the anaerobic treatment process of containerboard wastewater, which is less prone to problems of sludge calcification and pipe scaling. Moreover, the flocculent sludge comes from the aerobic system, does not need to be purchased from outside and can be discharged and filtered in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a device for treating boxboard wastewater in a specific embodiment of the present utility model.

[0022] List of parts and reference numerals:

[0023] 1. Anaerobic reactor; 2. Anaerobic water inlet pipe; 3. Anaerobic water outlet pipe; 4. Sludge dosing pump; 5. Aerobic residual sludge tank; 6. Inclined plate sedimentation tank; 7. Sludge return pump; 8. Separated water outlet pipe; 9. Automatic flocculant configuration device; 10. Flocculant dosing pump. DETAILED DESCRIPTION

[0024] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] Reference Figure 1This embodiment provides a containerboard wastewater treatment device, comprising an anaerobic reactor 1, equipped with an anaerobic inlet pipe 2 and an anaerobic outlet pipe 3. The anaerobic inlet pipe 2 is connected to a sludge dosing pump 4, which is connected to an aerobic excess sludge tank 5, which is used to store and cultivate excess sludge from the aerobic system. The anaerobic outlet pipe 3 is connected to an inclined plate sedimentation tank 6, which is equipped with a sludge discharge pipe. The sludge discharge pipe is located at the bottom of the inclined plate sedimentation tank 6 on the side closest to the anaerobic reactor 1. The bottom of the inclined plates in the inclined plate sedimentation tank 6 slopes downward toward the side closest to the anaerobic reactor 1. The sludge discharge pipe is connected to a sludge return pump 7, which is connected to the anaerobic inlet pipe 2. The inclined plate sedimentation tank 6 is provided with a separation water outlet pipe 8, which is arranged at the top of the inclined plate sedimentation tank 6 on the side away from the anaerobic reactor 1. A suspended matter detector is arranged on the outlet path of the separation water outlet pipe 8, and the separation water outlet pipe 8 is used to communicate with the aerobic system. The suspended matter detector is communicatively connected to the controller, the controller is communicatively connected to the flocculant dosing device, the flocculant dosing device is connected to the flocculant dosing pipe, and the flocculant dosing pipe is connected to the anaerobic water inlet pipe 2. The flocculant dosing device includes a flocculant automatic configuration device 9 and a flocculant dosing pump 10. The controller is communicatively connected to the flocculant dosing pump 10, and the flocculant dosing pump 10 is arranged on the path of the flocculant dosing pipe.

[0026] The working principle of this embodiment is:

[0027] The remaining sludge from the aerobic system is inoculated into an aerobic excess sludge tank 5 for temporary storage. After a brief acclimatization and cultivation process, it is introduced into the anaerobic reactor 1 via a sludge dosing pump 4 and anaerobic inlet pipe 2. The aerobic excess sludge is thoroughly mixed and reacted with the anaerobic inlet water within the anaerobic reactor 1, anaerobically treating the containerboard wastewater within the anaerobic reactor 1 and gradually reducing its chemical oxygen demand (COD). The anaerobic-treated wastewater flows from the anaerobic effluent pipe 3 into the inclined plate sedimentation tank 6. The aerobic excess sludge carried by the anaerobic effluent settles in the inclined plate sedimentation tank 6 for sludge-water separation. After settling, the sludge is transported to the anaerobic inlet pipe 2 via a sludge return pump 7, where it flows back into the anaerobic reactor 1 to participate in the anaerobic reaction. The supernatant from the inclined plate sedimentation tank 6 enters the aerobic system via the separated water effluent pipe 8.

[0028] A suspended matter detector is also provided on the outlet path of the separation water outlet pipe 8. The outlet suspended matter detector detects the suspended matter concentration in the supernatant flowing out of the separation water outlet pipe 8 online in real time. If the suspended matter concentration is too high, the controller sends a dosing signal to the flocculant dosing device. The flocculant dosing device introduces flocculant into the anaerobic water inlet pipe 2 through the flocculant dosing pipe, so that the suspended matter in the anaerobic reactor 1 is polymerized, which is convenient for separation, thereby reducing the suspended matter in the supernatant flowing out of the separation water outlet pipe 8 and reducing the power consumption of the aerobic system.

[0029] Those skilled in the art will understand that the aerobic system is used to treat untreated sewage and / or sewage that has been anaerobic pre-treated. The aerobic system in this embodiment is prior art, and the structure of the aerobic system is prior art.

[0030] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for treating wastewater from containerboard paper, comprising an anaerobic reactor (1), wherein the anaerobic reactor (1) is provided with an anaerobic water inlet pipe (2) and an anaerobic water outlet pipe (3), and wherein: The anaerobic water inlet pipe (2) is connected to the sludge dosing pump (4), and the sludge dosing pump (4) is connected to the aerobic excess sludge tank (5). The aerobic excess sludge tank (5) is used to store and cultivate excess sludge from the aerobic system.

2. The device for treating wastewater from containerboard according to claim 1, characterized in that: A suspended matter detector is provided on the outlet path of the anaerobic outlet pipe (3), the suspended matter detector is communicatively connected to the controller, the controller is communicatively connected to the flocculant dosing device, the flocculant dosing device is communicated with the flocculant dosing pipe, and the flocculant dosing pipe is communicated with the anaerobic inlet pipe (2).

3. The device for treating containerboard wastewater according to claim 2, characterized in that: The flocculant dosing device comprises a flocculant automatic configuration device (9) and a flocculant dosing pump (10). The controller is in communication connection with the flocculant dosing pump (10), and the flocculant dosing pump (10) is arranged on the path of the flocculant dosing pipeline.

4. The device for treating wastewater from containerboard according to claim 2, characterized in that: The anaerobic effluent pipe (3) is connected to the inclined plate sedimentation tank (6), and the inclined plate sedimentation tank (6) is provided with a sludge discharge pipe, which is connected to the sludge return pump (7), and the sludge return pump (7) is connected to the anaerobic inlet pipe (2).

5. The device for treating containerboard wastewater according to claim 4, characterized in that: The inclined plate sedimentation tank (6) is provided with a separation water outlet pipe (8), and the suspended matter detector is arranged on the outlet path of the separation water outlet pipe (8). The separation water outlet pipe (8) is used to communicate with the aerobic system.

6. The device for treating containerboard wastewater according to claim 5, characterized in that: The bottom of the inclined plate in the inclined plate sedimentation tank (6) is inclined downward toward the side close to the anaerobic reactor (1), and the sludge discharge pipe is arranged at the bottom of the inclined plate sedimentation tank (6) on the side close to the anaerobic reactor (1); the separated water outlet pipe (8) is arranged at the top of the inclined plate sedimentation tank (6) on the side away from the anaerobic reactor (1).

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