Papermaking wastewater treatment system

Abstract

The utility model relates to a papermaking wastewater treatment system which comprises an acidification tank, an anaerobic mechanism, an anaerobic sedimentation tank, a circulating pipeline, a first sludge discharge pump, an oxidation ditch and a deep treatment mechanism, and the anaerobic mechanism is connected with the acidification tank through a pipeline; a water inlet of the anaerobic sedimentation tank is connected with a water outlet of the anaerobic mechanism through a pipeline; one end of the circulating pipeline is connected with a sludge discharge port of the anaerobic sedimentation tank, and the other end of the circulating pipeline is connected to a pipeline between the anaerobic mechanism and the acidification tank; the first sludge discharge pump is arranged on the circulating pipeline and is used for conveying sludge in the anaerobic sedimentation tank into the anaerobic mechanism; a water inlet of the oxidation ditch is connected with a water outlet of the anaerobic sedimentation tank through a pipeline; the deep treatment mechanism is connected with the oxidation channel through a pipeline, and the deep treatment mechanism is used for performing deep purification treatment on the wastewater. The papermaking wastewater treatment system disclosed by the utility model reduces anaerobic sludge loss, ensures the treatment efficiency of an anaerobic mechanism, ensures the standard-reaching rate of wastewater treatment, and improves the environmental protection property.

Description

Technical Field

[0001] The utility model relates to the technical field of papermaking wastewater treatment, in particular to a papermaking wastewater treatment system. Background Art

[0002] In papermaking production, waste paper, straw, wood pulp, etc. are mostly used as papermaking raw materials. The production of pulp and paper generally consists of processes such as pulping, washing pulp, bleaching, and papermaking. Pulping in the paper industry includes alkaline pulping, chemi-mechanical pulping, and mechanical pulping; wastewater will be generated during papermaking production. If the wastewater is directly discharged, it will pollute the environment and is not conducive to environmental protection.

[0003] Therefore, it is necessary to further treat the wastewater before discharging it to the outside, so as to meet the discharge standards. At present, during the process of treating wastewater, the anaerobic sludge is easily lost when the effluent of the anaerobic mechanism directly enters the aerobic section, and the suspended solids at the back end of the wastewater treatment increase, resulting in non-compliance of the wastewater treatment and being not conducive to environmental protection. Summary of the Utility Model

[0004] For this reason, it is necessary to provide a papermaking wastewater treatment system to solve the technical problems that during the current process of treating wastewater, the anaerobic sludge is easily lost when the effluent of the anaerobic mechanism directly enters the aerobic section, and the suspended solids at the back end of the wastewater treatment increase, resulting in non-compliance of the wastewater treatment and being not conducive to environmental protection.

[0005] To achieve the above object, the inventor provides a papermaking wastewater treatment system, including:

[0006] An acidification tank;

[0007] An anaerobic mechanism, which is connected to the acidification tank through a pipeline;

[0008] An anaerobic sedimentation tank, the water inlet of which is connected to the water outlet of the anaerobic mechanism through a pipeline;

[0009] A circulation pipeline, one end of which is connected to the sludge discharge port of the anaerobic sedimentation tank, and the other end of which is connected to the pipeline between the anaerobic mechanism and the acidification tank;

[0010] A first sludge pump, which is arranged on the circulation pipeline and is used to transport the sludge in the anaerobic sedimentation tank into the anaerobic mechanism;

[0011] An oxidation ditch, the water inlet of which is connected to the water outlet of the anaerobic sedimentation tank through a pipeline;

[0012] And a deep treatment mechanism, which is connected to the oxidation ditch through a pipeline and is used to deeply purify and treat the wastewater.

[0013] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a control switch, and the control switch is arranged on the circulation pipeline.

[0014] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a collecting tank, a multi-disk thickener and a primary sedimentation thickener;

[0015] The multi-disk thickener is connected with the collecting tank through a pipeline, and the collecting tank is used for collecting and storing the sewage from the production workshop;

[0016] The primary sedimentation thickener is connected with the multi-disk thickener through a pipeline;

[0017] The acidification tank is connected with the primary sedimentation thickener through a pipeline.

[0018] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a secondary sedimentation tank and a final sedimentation tank;

[0019] The secondary sedimentation tank is connected with the water outlet of the oxidation ditch through a pipeline;

[0020] The advanced treatment mechanism is connected with the secondary sedimentation tank through a pipeline;

[0021] The final sedimentation tank is connected with the advanced treatment mechanism through a pipeline.

[0022] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a biochemical sludge thickener, a physical and chemical sludge thickener and a filter press mechanism;

[0023] The biochemical sludge thickener is connected with the secondary sedimentation tank through a pipeline, and the biochemical sludge thickener is connected with the filter press mechanism through a pipeline;

[0024] The physical and chemical sludge thickener is connected with the final sedimentation tank through a pipeline, and the physical and chemical sludge thickener is connected with the filter press mechanism through a pipeline;

[0025] The primary sedimentation thickener is connected with the filter press mechanism through a pipeline;

[0026] The filter press mechanism is used for oozing out the liquid in the sludge.

[0027] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a recycled water tank, the recycled water tank is connected with the final sedimentation tank through a pipeline, and the recycled water tank is used for recycling and storing the treated wastewater.

[0028] As a preferred structure of the present utility model, the papermaking wastewater treatment system further includes a first water pump, a control mechanism and a first detection mechanism;

[0029] The reused water tank is connected to the main pipe of the fire-fighting pipeline in the production workshop through a pipeline;

[0030] The first water pump is arranged on the pipeline between the reused water tank and the main pipe of the fire-fighting pipeline. The first water pump is electrically connected to the control mechanism, and the first water pump is used to transport the treated sewage in the reused water tank to the fire-fighting pipeline;

[0031] The first detection mechanism is arranged on the main pipe of the fire-fighting pipeline. The first detection mechanism is electrically connected to the control mechanism, and the first detection mechanism is used to detect the water pressure in the main pipe of the fire-fighting pipeline;

[0032] The control mechanism is used to receive and feedback the detection signal of the first detection mechanism, and control the start or stop of the first water pump.

[0033] As a preferred structure of the present utility model, the paper-making wastewater treatment system further includes a spray pond, a second water pump, a control mechanism and a second detection mechanism;

[0034] The spray pond is connected to the reused water tank through a pipeline;

[0035] The second water pump is arranged on the pipeline between the spray pond and the reused water tank,

[0036] The spray pond is connected to the multi-disc thickener through a pipeline, and the spray pond is used to supply water to the disc thickener;

[0037] The second detection mechanism is arranged in the spray pond. The second detection mechanism is electrically connected to the control mechanism, and the second detection mechanism is used to detect the water level height in the spray pond;

[0038] The control mechanism is used to receive and feedback the detection signal of the second detection mechanism, and control the start or stop of the second water pump.

[0039] As a preferred structure of the present utility model, the paper-making wastewater treatment system further includes a biogas pressure stabilizing cabinet, and the anaerobic mechanism is connected to the biogas pressure stabilizing cabinet through a gas pipe.

[0040] As a preferred structure of the present utility model, the paper-making sewage recycling system further includes a first connecting pipeline and a third water pump;

[0041] One end of the first connecting pipeline is connected to the acidification tank, and the other end of the first connecting pipeline is connected to the oxidation ditch;

[0042] The third water pump is arranged on the first connecting pipeline, and the third water pump is used to directly transport the sewage in the acidification tank to the oxidation ditch.

[0043] Different from the prior art, the beneficial effects of the above technical solution are as follows: In the papermaking wastewater treatment system of the present utility model, during the wastewater treatment process, the effluent from the anaerobic mechanism first enters the anaerobic sedimentation tank for sedimentation, avoiding the direct entry of the effluent from the anaerobic mechanism into the oxidation ditch, reducing the loss of anaerobic sludge. The supernatant of the anaerobic sedimentation tank flows into the oxidation ditch for further treatment, and the sedimented anaerobic sludge in the anaerobic sedimentation tank is recycled back into the anaerobic mechanism through the first sludge pump from the circulation pipeline, thereby reducing the loss of anaerobic sludge, ensuring the treatment efficiency of the anaerobic mechanism, avoiding or reducing the increase in suspended solids at the back end of wastewater treatment, ensuring the compliance rate of wastewater treatment, and improving environmental protection.

[0044] The above description of the content of the utility model is only an overview of the technical solution of this application. In order to enable those of ordinary skill in the art to more clearly understand the technical solution of this application, and thus be able to implement it based on the content described in the specification and the drawings, and in order to make the above objects, other objects, features, and advantages of this application more easily understood, the following is described in conjunction with the specific embodiments and drawings of this application. Brief Description of the Drawings

[0045] The drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of the specific embodiments of this application and other related contents, and should not be considered as a limitation to this application.

[0046] In the drawings of the specification:

[0047] Figure 1 It is one of the flow schematic diagrams of the papermaking wastewater treatment system described in the specific embodiment;

[0048] Figure 2 It is the second flow schematic diagram of the papermaking wastewater treatment system described in the specific embodiment;

[0049] Figure 3 It is the third flow schematic diagram of the papermaking wastewater treatment system described in the specific embodiment;

[0050] Figure 4 It is the partial flow schematic diagram of the papermaking wastewater treatment system described in the specific embodiment;

[0051] Figure 5 It is the circuit connection schematic diagram of the papermaking wastewater treatment system described in the specific embodiment. The reference numerals involved in the above drawings are described as follows:

[0052] 1, collecting tank,

[0053] 2, multi-disc thickener,

[0054] 3, primary sedimentation thickening tank,

[0055] 4, acidification tank,

[0056] 5, anaerobic mechanism,

[0057] 6. Anaerobic sedimentation tank

[0058] 7. Circulation pipeline

[0059] 8. First sludge discharge pump

[0060] 9. Control switch

[0061] 10. Oxidation ditch

[0062] 11. Secondary sedimentation tank

[0063] 12. Advanced treatment mechanism

[0064] 121. Coagulation reaction tank

[0065] 122. Coagulation sedimentation tank

[0066] 123. Fenton reaction tank

[0067] 124. Fenton sedimentation tank

[0068] 13. Final sedimentation tank

[0069] 14. Reclaimed water tank

[0070] 15. Biochemical sludge thickening tank

[0071] 16. Physicochemical sludge thickening tank

[0072] 17. Filter press mechanism

[0073] 18. First water pump

[0074] 19. Fire pipeline

[0075] 20. Second water pump

[0076] 21. Spraying pool

[0077] 22. Biogas pressure stabilizing cabinet

[0078] 23. First connecting pipeline

[0079] 24. Third water pump

[0080] 25. Control mechanism

[0081] 26. First detection mechanism

[0082] 27. Second detection mechanism Specific implementation mode

[0083] To elaborate on the possible application scenarios, technical principles, specific implementable solutions, achievable objectives and effects of this application in detail, the following will be described in detail with reference to the specific examples listed and in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application, so they are only examples and cannot be used to limit the protection scope of this application.

[0084] As used herein, the mention of "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The term "embodiment" that appears in various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0085] Unless otherwise defined, the meanings of the technical terms used herein are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0086] In the description of this application, the phrase "and / or" is an expression used to describe the logical relationship between objects, indicating that three relationships may exist. For example, A and / or B means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this article generally represents an "or" logical relationship between the associated objects before and after.

[0087] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary or secondary, or order relationship between these entities or operations.

[0088] Without more limitations, in this application, the use of "including", "comprising", "having" or other similar expressions in a statement is intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method or product including the described elements, so that a process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0089] Similar to the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the base number; expressions such as "above", "below", and "within" are understood to include the base number. In addition, in the description of the embodiments of this application, the meaning of "multiple" is two or more (including two), and similar expressions related to "many" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise specifically and clearly defined.

[0090] In the description of the embodiments of this application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of this application or for the reader to understand, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, so it cannot be understood as a limitation to the embodiments of this application. In addition, in the context, it should also be understood that when it is mentioned that one element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0091] Unless otherwise clearly specified or limited, in the description of the embodiments of this application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art to which this application belongs, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0092] Please refer to Figures 1 to 5 , this embodiment relates to a papermaking wastewater treatment system, including:

[0093] An acidification tank 4; the acidification tank 4 is a tank body that ferments to produce acidic substances by microbial degradation of organic matter. The wastewater in the acidification tank 4 is decomposed by microorganisms into sugars, fatty acids, and amino acids, and some organic acids, such as acetic acid and propionic acid, will be produced by the microorganisms during this process. These organic acids can lower the pH value of the wastewater to about 4.5 - 5.0, creating conditions for the subsequent treatment of the sewage.

[0094] Anaerobic mechanism 5, the anaerobic mechanism 5 is connected to the acidification tank 4 through a pipeline; the main function of the anaerobic mechanism 5 is to remove organic substances from the wastewater and reduce the emission of harmful gases. The anaerobic mechanism 5 can effectively degrade and transform organic pollutants in the wastewater, such as suspended solids, organic matter, grease, etc., reduce the concentration of organic matter and the content of COD (chemical oxygen demand). Moreover, the anaerobic mechanism 5 can also convert organic matter into reusable anaerobic digestion products, such as methane, etc. The anaerobic mechanism 5 can achieve the purification and resource utilization of wastewater, meeting the requirements of environmental protection and sustainable development. Specifically, in this embodiment, the anaerobic mechanism 5 is composed of an upflow anaerobic reactor and an upflow multi-stage treatment anaerobic reactor. Among them, the bleaching wastewater and the papermaking wastewater are respectively passed through the upflow anaerobic reactor and the upflow multi-stage treatment anaerobic reactor, and through anaerobic microbial treatment, the COD of the wastewater is removed, saving the floor area and having a high COD removal rate.

[0095] Anaerobic sedimentation tank 6, the inlet of the anaerobic sedimentation tank 6 is connected to the outlet of the anaerobic mechanism 5 through a pipeline; among them, the water discharged from the anaerobic mechanism 5 first enters the anaerobic sedimentation tank 6 for sedimentation to reduce the loss of anaerobic sludge.

[0096] Circulation pipeline 7, one end of the circulation pipeline 7 is connected to the sludge discharge port of the anaerobic sedimentation tank 6, and the other end of the circulation pipeline 7 is connected to the pipeline between the anaerobic mechanism 5 and the acidification tank 4. Through the circulation pipeline 7, the sludge sedimentation tank is circularly transported into the anaerobic mechanism 5 to reduce the loss of anaerobic sludge and ensure the treatment efficiency of the anaerobic mechanism 5.

[0097] First sludge pump 8, the first sludge pump 8 is arranged on the circulation pipeline 7, and the first sludge pump 8 is used to transport the sludge in the anaerobic sedimentation tank 6 into the anaerobic mechanism 5, thereby reducing the loss of anaerobic sludge and ensuring the treatment efficiency of the anaerobic mechanism 5.

[0098] Oxidation ditch 10, the inlet of the oxidation ditch 10 is connected to the outlet of the anaerobic sedimentation tank 6 through a pipeline; the oxidation ditch 10 converts organic pollutants into harmless substances through a biological reaction process, and at the same time realizes the recovery of energy and the reuse of water. In this process, the organic matter in the wastewater is decomposed into smaller organic molecules, and then sequentially oxidized and degraded by microorganisms into carbon dioxide and water, and is converted into the energy required by itself through an oxidation-reduction reaction, so as to achieve the effect of nitrogen and phosphorus removal.

[0099] And a deep treatment mechanism 12, the deep treatment mechanism 12 is connected to the oxidation ditch 10 through a pipeline, and the deep treatment mechanism 12 is used to carry out deep purification treatment on the wastewater to further treat the wastewater and improve the environmental protection performance.

[0100] Specifically, in the papermaking wastewater treatment system of this embodiment, during the wastewater treatment process, the effluent from the anaerobic mechanism 5 first enters the anaerobic sedimentation tank 6 for sedimentation, avoiding the direct entry of the effluent from the anaerobic mechanism 5 into the oxidation ditch 10 and reducing the loss of anaerobic sludge. The supernatant of the anaerobic sedimentation tank 6 flows into the oxidation ditch 10 for further treatment. The sedimented anaerobic sludge in the anaerobic sedimentation tank 6 is recycled back into the anaerobic mechanism 5 through the first sludge pump from the circulation pipeline 7, thereby reducing the loss of anaerobic sludge, ensuring the treatment efficiency of the anaerobic mechanism 5. At the same time, the COD (chemical oxygen demand) of the influent to the oxidation ditch 10 decreases by 20%, avoiding or reducing the increase in suspended solids at the back end of the wastewater treatment, ensuring the compliance rate of wastewater treatment, and improving environmental protection.

[0101] Optionally, in some embodiments, as Figures 1 to 5 shown, the papermaking wastewater treatment system further includes a control switch 9, and the control switch 9 is arranged on the circulation pipeline 7, wherein the control switch 9 is used to control the on-off of the circulation pipeline 7 to prevent the wastewater in the acidification tank 4 from flowing into the anaerobic sedimentation tank 6. Specifically, the control switch 9 is a solenoid valve or a manual valve.

[0102] Optionally, in some embodiments, as Figures 1 to 5 shown, the papermaking wastewater treatment system further includes a collecting tank 1, a multi-disc thickener 2, and a primary sedimentation thickener 3; the multi-disc thickener 2 is connected to the collecting tank 1 through a pipeline, and the collecting tank 1 is used to collect and store the sewage from the production workshop; the multi-disc thickener 2 is an efficient dewatering device, and its advantages include a large surface area, a small floor area, the ability to increase production capacity by increasing the number of discs, a high pulp concentration, and less solid loss. In this embodiment, the multi-disc thickener 2 is used to replace the traditional inclined screen for pressing pulp, and the multi-disc thickener 2 has the advantages of a small floor area, a high pulp recovery rate, a high degree of automation, and a reduction in manpower and material resources. The primary sedimentation thickener 3 is connected to the multi-disc thickener 2 through a pipeline; the acidification tank 4 is connected to the primary sedimentation thickener 3 through a pipeline. In this embodiment, the primary sedimentation thickener 3 is used to replace the primary sedimentation tank, and the primary sedimentation thickener 3 has the advantages of a sludge storage function, a reduction in the number of thickeners, and space savings.

[0103] Optionally, in some embodiments, as Figures 1 to 5 shown, the papermaking wastewater treatment system further includes a secondary sedimentation tank 11 and a final sedimentation tank 13; the secondary sedimentation tank 11 is connected to the outlet of the oxidation ditch 10 through a pipeline; the advanced treatment mechanism 12 is connected to the secondary sedimentation tank 11 through a pipeline; the final sedimentation tank 13 is connected to the advanced treatment mechanism 12 through a pipeline. By providing the secondary sedimentation tank 11 and the final sedimentation tank 13, the sludge in the wastewater is further sedimented to ensure the wastewater treatment effect. Specifically, as Figure 4As shown, the advanced treatment mechanism 12 in this embodiment includes a coagulation reaction tank 121, a coagulation sedimentation tank 122, a Fenton reaction tank 123, and a Fenton sedimentation tank 124. The coagulation reaction tank 121, the coagulation sedimentation tank 122, the Fenton reaction tank 123, and the Fenton sedimentation tank 124 are sequentially connected by pipelines. The wastewater is subjected to advanced purification treatment through the coagulation reaction tank 121, the coagulation sedimentation tank 122, the Fenton reaction tank 123, and the Fenton sedimentation tank 124 to further treat the wastewater and improve environmental protection.

[0104] Optionally, in some embodiments, such as Figures 1 to 5 As shown, the papermaking wastewater treatment system further includes a biochemical sludge thickening tank 15, a physicochemical sludge thickening tank 16, and a filter pressing mechanism 17. The biochemical sludge thickening tank 15 is connected to the secondary sedimentation tank 11 by a pipeline, and the biochemical sludge thickening tank 15 is connected to the filter pressing mechanism 17 by a pipeline. The physicochemical sludge thickening tank 16 is connected to the final sedimentation tank 13 by a pipeline, and the physicochemical sludge thickening tank 16 is connected to the filter pressing mechanism 17 by a pipeline. The primary sedimentation thickening tank 3 is connected to the filter pressing mechanism 17 by a pipeline. The filter pressing mechanism 17 is used to exude the liquid in the sludge. The biochemical sludge thickening tank 15 is also called the deep dewatering tank of the aeration tank. Its treatment principle is to expose the biochemical sludge to the air and utilize the oxygen in the air to allow the microorganisms in the sludge to carry out oxidation decomposition, so that the organic matter in the sludge is degraded, thereby achieving the purpose of thickening. The physicochemical sludge thickening tank 16 is a device that treats sludge with chemical agents to cause redox reactions, accelerate the evaporation of water and the aggregation of sludge particles, thereby achieving sludge thickening. Its treatment principle is to mix the sludge with chemical agents and carry out mixing and reaction under certain conditions, so that the water in the sludge evaporates and the sludge particles coagulate to achieve the purpose of thickening. The sludge is thickened through the biochemical sludge thickening tank 15 and the physicochemical sludge thickening tank 16, and then the sludge is filter-pressed by the filter pressing mechanism 17 to exude the water in the sludge, and the sludge is further treated. The filter pressing mechanism 17 is a plate-width filter press.

[0105] Optionally, in some embodiments, such as Figures 1 to 5 As shown, the papermaking wastewater treatment system further includes a reused water tank 14. The reused water tank 14 is connected to the final sedimentation tank 13 by a pipeline, and the reused water tank 14 is used to recycle and store the treated wastewater. By recycling and storing the treated wastewater through the reused water tank 14, the water resources can be recycled, avoiding waste of water resources and improving environmental protection. It should be noted that the number of reused water tanks 14 is not limited in this embodiment and can be one or more.

[0106] Optionally, in some embodiments, such as Figures 1 to 5As shown, the papermaking wastewater treatment system further includes a first water pump 18, a control mechanism 25, and a first detection mechanism 26; the reuse water tank 14 is connected to the main pipe of the fire protection pipeline 19 in the production workshop through a pipeline; by using the wastewater in the reuse water tank 14 for the fire protection pipeline 19 in the fire protection field, so as to carry out fire extinguishing, effectively recycle the wastewater, save water resources, reduce the use of fresh water, reduce costs, reduce the sewage discharge, reduce environmental pollution, improve environmental protection, achieve energy conservation and emission reduction, and realize clean production. The first water pump is arranged on the pipeline between the reuse water tank 14 and the main pipe of the fire protection pipeline 19, the first water pump 18 is electrically connected to the control mechanism 25, and the first water pump 18 is used to transport the treated sewage in the reuse water tank 14 to the fire protection pipeline 19; the first detection mechanism 26 is arranged on the main pipe of the fire protection pipeline 19, the first detection mechanism 26 is electrically connected to the control mechanism 25, and the first detection mechanism 26 is used to detect the water pressure in the main pipe of the fire protection pipeline 19; the control mechanism 25 is used to receive and feedback the detection signal of the first detection mechanism 26 and control the start or stop of the first water pump 18. Specifically, in this embodiment, the water pressure in the main pipe of the fire protection pipeline 19 is monitored in real time by the first detection mechanism 26. When the water pressure detected by the first detection mechanism 26 is lower than the preset value, the first detection mechanism 26 sends a signal to the control mechanism 25. After receiving the signal, the control mechanism 25 makes an identification and feedback, and controls the first water pump 18 to start, and transports the wastewater in the reuse water tank 14 into the fire protection pipeline 19 to achieve automatic water replenishment. Among them, the control mechanism 25 is a DCS controller. The first detection mechanism 26 is a pressure sensor. It should be noted that the preset value in this embodiment is 0.5 MPa.

[0107] Optionally, in some embodiments, such as Figures 1 to 5As shown, the paper-making wastewater treatment system further includes a spray pond 21, a second water pump 20, a control mechanism 25, and a second detection mechanism 27; the spray pond 21 is connected to the recycled water tank 14 through a pipeline; the second water pump 20 is arranged on the pipeline between the spray pond 21 and the recycled water tank 14, and the spray pond 21 is connected to the multi-disc thickener 2 through a pipeline. The spray pond 21 is used to supply water to the disc thickener, so as to effectively recycle the wastewater, save water resources, reduce the use of fresh water, reduce costs, reduce the sewage discharge volume, reduce environmental pollution, improve environmental protection, achieve energy conservation and emission reduction, and realize clean production. The second detection mechanism 27 is arranged in the spray pond 21, and the second detection mechanism 27 is electrically connected to the control mechanism 25. The second detection mechanism 27 is used to detect the water level height in the spray pond 21; the control mechanism 25 is used to receive and feedback the detection signal of the second detection mechanism 27, and control the start or stop of the second water pump 20. Specifically, in this embodiment, the water level height of the spray pond 21 is monitored in real time by the second detection mechanism 27. When the water level height detected by the second detection mechanism 27 is lower than the preset value, the second detection mechanism 27 sends a signal to the control mechanism 25. After receiving the signal, the control mechanism 25 makes an identification and feedback, and controls the second water pump 20 to start, and conveys the wastewater in the recycled water tank 14 to the spray pond 21 to achieve automatic water replenishment, and the spray pond 21 supplies water to the multi-disc thickener 2. The control mechanism 25 is a DCS controller. The second detection mechanism 27 is a liquid level sensor. It should be noted that the size of the preset value in this embodiment can be determined according to the actual situation (such as: the size or height of the poly-spray pond 21, etc.).

[0108] Optionally, in some embodiments, such as Figure 2 and Figure 3 As shown, the paper-making wastewater treatment system further includes a biogas pressure stabilizing tank 22. The anaerobic mechanism 5 is connected to the biogas pressure stabilizing tank 22 through a gas pipe. The biogas generated by the anaerobic reaction of the anaerobic mechanism 5 is transported to the biogas pressure stabilizing tank 22 through the gas pipe for storage for use by the equipment in the production workshop.

[0109] Optionally, in some embodiments, such as Figure 3As shown, the papermaking sewage recycling system further includes a first connecting pipeline 23 and a third water pump 24; one end of the first connecting pipeline 23 is connected to the acidification tank 4, and the other end of the first connecting pipeline 23 is connected to the oxidation ditch 10; the third water pump 24 is arranged on the first connecting pipeline 23, and the third water pump 24 is used to directly transport the sewage in the acidification tank 4 into the oxidation ditch 10. Specifically, when the nitrogen content of the sewage in the reclaimed water tank 14 exceeds the preset value standard, the third water pump 24 is started, and the wastewater in the acidification tank 4 is directly transported into the oxidation ditch 10 through the first connecting pipeline 23 by the third water pump 24. Since the wastewater in the acidification tank 4 is decomposed into sugar, fatty acids and amino acids by microorganisms, the sugar decomposed in the acidification tank 4 is used to replace the carbon source to supplement and balance the carbon-nitrogen ratio of the oxidation ditch 10, so as to ensure the best carbon-nitrogen ratio of the oxidation ditch 10, improve the denitrification efficiency of the oxidation ditch 10, reduce the addition of organic matter into the oxidation ditch 10, reduce the chemical consumption, reduce the cost, reduce the number of surface aerators turned on, and reduce the energy consumption. According to the actual feedback, the cost of adding organic matter is reduced by 0.5 yuan per ton of water; the power consumption is reduced by 0.1 yuan per ton of water. It should be noted that the preset value of the nitrogen content of the wastewater can be adjusted and set according to the actual situation. In this embodiment, the preset value of the nitrogen content of the wastewater is 5 mg / L. It should be noted that in this embodiment, when the nitrogen content exceeds the preset value, the third water pump 24 pumps about 10% of the sewage in the acidification tank 4 directly into the oxidation ditch 10, and the remaining 90% of the sewage in the acidification tank 4 flows into the anaerobic mechanism 5. The proportion of the extracted wastewater can be adjusted according to the actual situation. The nitrogen content of the sewage in the reclaimed water tank 14 can be detected by an ammonia nitrogen detector.

[0110] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solutions obtained by equivalent structure or equivalent process substitution or modification based on the essential concept of the present application and using the content recorded in the text and drawings of the specification of the present application, as well as those directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are all included in the patent protection scope of the present application.

Claims

1. A papermaking wastewater treatment system, characterized in that: include: Acidification pond; An anaerobic mechanism, wherein the anaerobic mechanism is connected to the acidification tank via a pipeline; An anaerobic sedimentation tank, wherein the water inlet of the anaerobic sedimentation tank is connected to the water outlet of the anaerobic mechanism through a pipeline; A circulation pipeline, one end of which is connected to the mud discharge port of the anaerobic sedimentation tank, and the other end of which is connected to the pipeline between the anaerobic mechanism and the acidification tank; a first sludge pump, the first sludge pump being arranged on the circulation pipeline, and the first sludge pump being used for conveying the sludge in the anaerobic sedimentation tank to the anaerobic mechanism; An oxidation ditch, wherein the water inlet of the oxidation ditch is connected to the water outlet of the anaerobic sedimentation tank through a pipeline; And a deep treatment mechanism, the deep treatment mechanism is connected to the oxidation channel through a pipeline, and the deep treatment mechanism is used for deep purification of wastewater.

2. The papermaking wastewater treatment system according to claim 1, characterized in that: The papermaking wastewater treatment system also includes a control switch, which is arranged on the circulation pipeline.

3. The papermaking wastewater treatment system according to claim 1, characterized in that: The papermaking wastewater treatment system also includes a water collection tank, a multi-disc thickener and a primary sedimentation thickener; The multi-disc concentrator is connected to the water collection tank via a pipeline, and the water collection tank is used to collect and store sewage from the production workshop; The primary sedimentation and concentrating tank is connected to the multi-disc concentrator via a pipeline; The acidification tank is connected to the primary sedimentation and concentration tank through a pipeline.

4. The papermaking wastewater treatment system according to claim 3, characterized in that: The papermaking wastewater treatment system also includes a secondary sedimentation tank and a final sedimentation tank; The secondary sedimentation tank is connected to the water outlet of the oxidation ditch through a pipeline; The deep treatment mechanism is connected to the secondary sedimentation tank via a pipeline; The final sedimentation tank is connected to the deep treatment mechanism through a pipeline.

5. The papermaking wastewater treatment system according to claim 4, characterized in that: The papermaking wastewater treatment system also includes a biochemical sludge concentration tank, a physicochemical sludge concentration tank and a filter press mechanism; The biochemical sludge concentration tank is connected to the secondary sedimentation tank through a pipeline, and the biochemical sludge concentration tank is connected to the filter press mechanism through a pipeline; The physicochemical sludge thickening tank is connected to the final sedimentation tank through a pipeline, and the physicochemical sludge thickening tank is connected to the filter press mechanism through a pipeline; The primary sedimentation and concentration tank is connected to the filter press mechanism through a pipeline; The filter press mechanism is used to extract liquid from the sludge.

6. The papermaking wastewater treatment system according to claim 4, characterized in that: The papermaking wastewater treatment system also includes a reuse water pool, which is connected to the final sedimentation tank through a pipeline, and the reuse water pool is used to recycle and store treated wastewater.

7. The papermaking wastewater treatment system according to claim 6, characterized in that: The papermaking wastewater treatment system also includes a first water pump, a control mechanism and a first detection mechanism; The reuse water pool is connected to the main pipe of the fire protection pipeline in the production workshop through a pipeline; The first water pump is arranged on the pipeline between the reuse water pool and the main pipe of the fire-fighting pipeline, the first water pump is electrically connected to the control mechanism, and the first water pump is used to transport the treated sewage in the reuse water pool to the fire-fighting pipeline; The first detection mechanism is arranged on the main pipe of the fire-fighting pipeline, the first detection mechanism is electrically connected to the control mechanism, and the first detection mechanism is used to detect the water pressure in the main pipe of the fire-fighting pipeline; The control mechanism is used to receive the detection signal fed back from the first detection mechanism and control the start or stop of the first water pump.

8. The papermaking wastewater treatment system according to claim 6 or 7, characterized in that: The papermaking wastewater treatment system also includes a spray water pool, a second water pump, a control mechanism and a second detection mechanism; The spray water pool is connected to the reuse water pool through a pipeline; The second water pump is arranged on the pipeline between the spray water pool and the reuse water pool. The spray water pool is connected to the multi-disc concentrator via a pipeline, and the spray water pool is used to supply water to the disc concentrator; The second detection mechanism is arranged in the spray water pool, the second detection mechanism is electrically connected to the control mechanism, and the second detection mechanism is used to detect the water level in the spray water pool; The control mechanism is used to receive the detection signal fed back from the second detection mechanism and control the start or shut down of the second water pump.

9. The papermaking wastewater treatment system according to claim 1, characterized in that: The papermaking wastewater treatment system further comprises a biogas pressure stabilizing cabinet, and the anaerobic mechanism is connected to the biogas pressure stabilizing cabinet via an air pipe.

10. The papermaking wastewater treatment system according to claim 6, characterized in that: The papermaking wastewater recycling system also includes a first connecting pipeline and a third water pump; One end of the first connecting pipeline is connected to the acidification tank, and the other end of the first connecting pipeline is connected to the oxidation ditch; The third water pump is arranged on the first connecting pipeline, and the third water pump is used to directly transport the sewage in the acidification tank to the oxidation ditch.

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