Paper plant sewage pretreatment unit and paper plant sewage treatment station

Abstract

The utility model discloses a paper mill sewage pretreatment unit and a paper mill sewage treatment station, the paper mill sewage pretreatment unit comprises an adjusting tank, a first cooling tower, a second cooling tower and a primary sedimentation tank, a sewage discharge pipe is communicated with a water inlet of the first cooling tower, and a first valve is arranged at the communication part; a water outlet of the first cooling tower is communicated with the interior of the adjusting tank, the sewage discharge pipe is further communicated with the interior of the adjusting tank, a second valve is arranged at the communication position, a water outlet of the adjusting tank is communicated with the interior of the primary settling tank, and a third valve is arranged at the communication position; the water outlet of the adjusting tank is further communicated with the water inlet of the second cooling tower, a fourth valve is arranged at the communicating position of the water outlet of the adjusting tank and the water inlet of the second cooling tower, the water outlet of the second cooling tower is communicated with the interior of the primary sedimentation tank, the structure is simple, water temperature pieces in the adjusting tank and the primary sedimentation tank can be adjusted, and therefore the sewage treatment efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, and in particular relates to a paper mill sewage pretreatment unit and a paper mill sewage treatment station. Background Art

[0002] Papermaking enterprises consume a large amount of water, and their sewage comes from many sources, mainly production wastewater, workshop ditch water and factory rainwater. Since the outlet temperature of production wastewater is usually higher in summer, the water temperature will further increase when it enters the primary sedimentation tank. If the water temperature is not adjusted, this will reduce the treatment efficiency in the anaerobic tank and aerobic tank (mainly reflected in the high water temperature, which leads to reduced activity of anaerobic and aerobic bacteria), and ultimately lead to the treated sewage indicators failing to meet the standards, increasing the enterprise's sewage treatment costs. Although the sewage treatment equipment with document number CN219363423U "MBBR integrated sewage treatment equipment" discloses adjusting the water temperature, it is not suitable for large-scale sewage treatment and cannot meet the wastewater treatment needs of papermaking enterprises. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide a paper mill sewage pretreatment unit which has a simple structure and can treat the sewage of papermaking enterprises and adjust the water temperature in summer.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a paper mill wastewater pretreatment unit, comprising a regulating tank, a first cooling tower, a second cooling tower and a primary sedimentation tank, the sewage discharge pipe is connected to the water inlet of the first cooling tower and a first valve is arranged at the connection point, the water outlet of the first cooling tower is connected to the regulating tank, the sewage discharge pipe is also connected to the regulating tank and a second valve is arranged at the connection point, the water outlet of the regulating tank is connected to the primary sedimentation tank and a third valve is arranged at the connection point, the water outlet of the regulating tank is also connected to the water inlet of the second cooling tower and a fourth valve is arranged at the connection point between the two, and the water outlet of the second cooling tower is connected to the primary sedimentation tank.

[0005] The beneficial effect of the above technical solution is that: in this way, sewage can be discharged directly into the regulating tank through the sewage discharge pipe. When the sewage temperature is high, the sewage discharged from the sewage discharge pipe is first cooled in the first cooling tower and then enters the regulating tank. In this way, the water temperature in the regulating tank can be lowered as a whole, and the sewage in the regulating tank can be discharged into the primary sedimentation tank. When the sewage in the regulating tank is discharged into the primary sedimentation tank, if the sewage temperature in the regulating tank is high, it can be cooled in the second cooling tower and then discharged into the primary sedimentation tank. If the water temperature in the regulating tank is appropriate, it can be directly discharged into the primary sedimentation tank.

[0006] The above technical solution also includes an accident pool, an overflow port is provided at the upper end of the regulating pool, the overflow port of the regulating pool is connected to the accident pool, and the water outlet of the accident pool is connected to the regulating pool through a first water pump.

[0007] The beneficial effect of the above technical solution is that when a failure occurs in the regulating tank or the amount of water flowing in is large and exceeds the load of the regulating tank, part of the sewage can be discharged into the accident tank for temporary storage so that it can be returned to the regulating tank for reprocessing later.

[0008] The above technical solution also includes a rainwater collection pool arranged in the factory area, and the water outlet of the rainwater collection pool is connected to the accident pool through a second water pump.

[0009] The beneficial effect of the above technical solution is that the wastewater collected in the rainwater collection pool in the factory area can be centrally recycled and finally discharged into the accident pool for temporary storage so that it can be returned to the regulating pool at a later time.

[0010] In the above technical solution, a third water pump is provided at the water outlet of the regulating tank, and the water in the regulating tank is pumped to the second cooling tower or the primary sedimentation tank through the third water pump.

[0011] The beneficial effect of the above technical solution is that the sewage in the regulating tank is pumped out through the third water pump.

[0012] The above technical solution also includes a controller, a first temperature sensor is arranged in the regulating tank, a second temperature sensor is arranged at the sewage discharge pipe, the first valve, the second valve, the third valve and the fourth valve are all electrically controlled valves, and the first temperature sensor, the second temperature sensor, the first valve, the second valve, the third valve, the fourth valve and the third water pump are all electrically connected to the controller.

[0013] The beneficial effect of the above technical solution is that it makes the whole paper mill wastewater pretreatment unit highly intelligent.

[0014] In the above technical solution, a plurality of first temperature sensors are arranged in the regulating pool, and the plurality of first temperature sensors are distributed at intervals in the regulating pool.

[0015] The beneficial effect of the above technical solution is that its structure is simple, so that water temperature in different areas of the regulating pool can be monitored.

[0016] The regulating pool in the above technical solution is provided with a floating object collecting assembly, and the floating object collecting assembly is used to collect floating objects floating on the water surface in the regulating pool.

[0017] The beneficial effect of the above technical solution is that the floating object collection component can be used to collect and recycle the floating paper fibers in the regulating tank.

[0018] The above technical solution also includes a slurry pool, which is used to collect the floating objects collected by the floating object collecting assembly and the solid matter settled at the bottom of the primary sedimentation tank.

[0019] The beneficial effect of the above technical solution is that the floating materials in the regulating tank and the sediments in the primary sedimentation tank can be collected through the slurry tank.

[0020] The slag outlet of the slurry pool in the above technical solution is connected to the pulp tank and the sludge pressing workshop respectively.

[0021] The beneficial effect of the above technical solution is that the components collected in the slurry pool can be returned to the papermaking system for reuse or discharged to the sludge pressing workshop to make mud bricks.

[0022] The second purpose of the utility model is to provide a paper mill sewage treatment station which has a simple structure and can efficiently treat paper mill sewage.

[0023] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a paper mill wastewater treatment station comprises the paper mill wastewater pretreatment unit as described above.

[0024] The beneficial effects of the above technical solution are: its structure is simple and its sewage treatment efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a paper mill wastewater pretreatment unit according to an embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure when the paper mill wastewater pretreatment unit according to the embodiment of the utility model is provided with an accident pool;

[0027] Figure 3 This is a schematic structural diagram of a paper mill sewage pretreatment unit provided with a rainwater collection tank according to an embodiment of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the sewage discharge pipe and the temperature sensor provided in the regulating tank in the embodiment of the utility model;

[0029] Figure 5 Schematic diagram of electrical connection of the controller in the embodiment of the present utility model.

[0030] In the figure: 1 regulating tank; 2 first cooling tower; 3 second cooling tower; 4 primary sedimentation tank; 5 second water pump; 6 sewage discharge pipe; 7 first valve; 8 second valve; 9 third valve; 10 fourth valve; 11 accident tank; 12 first water pump; 13 rainwater collection tank; 14 third water pump; 15 controller; 16 first temperature sensor; 17 second temperature sensor; 18 floating object collection component; 19 slurry tank; 20 pulp tank; 21 sludge pressing workshop. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0032] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0035] Example 1

[0036] like Figure 1As shown, this embodiment provides a paper mill wastewater pretreatment unit, including a regulating tank 1, a first cooling tower 2, a second cooling tower 3 and a primary sedimentation tank 4, a sewage discharge pipe 6 is connected to the water inlet of the first cooling tower 2 and a first valve 7 is arranged at the connection, the outlet of the first cooling tower 2 is connected to the regulating tank 1, the sewage discharge pipe 6 is also connected to the regulating tank 1 and a second valve 8 is arranged at the connection, the outlet of the regulating tank 1 is connected to the primary sedimentation tank 4 and a third valve 9 is arranged at the connection, the outlet of the regulating tank 1 is also connected to the water inlet of the second cooling tower 3 and a valve 8 is arranged between the two A fourth valve 10 is provided at the connection point, and the outlet of the second cooling tower 3 is connected with the primary sedimentation tank 4, so that the sewage can be directly discharged into the regulating tank through the sewage discharge pipe. When the sewage temperature is relatively high, the sewage discharged from the sewage discharge pipe is first cooled by the first cooling tower and then enters the regulating tank. In this way, the water temperature in the regulating tank can be lowered as a whole, and the sewage in the regulating tank can be discharged into the primary sedimentation tank. When the sewage in the regulating tank is discharged into the primary sedimentation tank, if the sewage temperature in the regulating tank is relatively high, it can be cooled by the second cooling tower and then discharged into the primary sedimentation tank. If the water temperature in the regulating tank is suitable, it can be directly discharged into the primary sedimentation tank.

[0037] Among them, whether the first cooling tower and the second cooling tower are activated mainly depends on the water temperature in the regulating tank, and its purpose is to control the water temperature in the regulating tank below 37°C (since the subsequent anaerobic bacteria and aerobic bacteria need to release heat in the process of sewage treatment, the water temperature is lowered in advance to avoid the continuous increase in water temperature in the later period, which leads to the decrease in the activity of aerobic sludge and anaerobic sludge. For winter, the water temperature of sewage is low, but it does not affect the efficiency of microorganisms in sewage treatment, because the water temperature in the aerobic tank and anaerobic tank will increase and be at a temperature relatively suitable for the activity of microorganisms).

[0038] like Figure 2 As shown, the above technical scheme also includes an accident pool 11, and an overflow port is provided at the upper end of the regulating pool 1. The overflow port of the regulating pool 1 is connected to the accident pool 11, and the outlet of the accident pool 11 is connected to the regulating pool 1 through the first water pump 12. In this way, when a failure occurs in the regulating pool or the amount of water flowing in is large and exceeds the load of the regulating pool, part of the sewage can be discharged into the accident pool for temporary storage, so that it can be returned to the regulating pool for reprocessing later. In this embodiment, a redundant design of the regulating pool can be achieved by adding an accident pool, which can prevent the regulating pool from losing its function due to a failure, or the amount of sewage flowing in is large and exceeds the processing load of the regulating pool. At this time, the sewage overflowing from the regulating pool can be discharged into the accident pool for temporary storage. Once the regulating pool can normally process the sewage and the processing volume is not in a saturated state, the sewage in the accident pool can be pumped into the regulating pool through the first water pump.

[0039] like Figure 3 As shown, the above technical scheme also includes a rainwater collection pool 13 set up in the factory area. The outlet of the rainwater collection pool 13 is connected to the accident pool 11 through the second water pump 5. In this way, the wastewater collected in the rainwater collection pool in the factory area can be centrally recovered and finally discharged into the accident pool for temporary storage so that it can be returned to the regulating pool later. Since there is dust or pollutants on the ground in the factory area of ​​the papermaking enterprise, the rainwater in the factory area also needs to be recycled and processed to avoid the rainwater in the factory area from being discharged into the municipal pipe network, which will eventually cause environmental pollution (or even pollution spread).

[0040] In the above technical solution, a third water pump 14 is arranged at the water outlet of the regulating tank 1, and the water in the regulating tank 1 is pumped to the second cooling tower 3 or the primary sedimentation tank 4 through the third water pump 14, so that the sewage in the regulating tank is pumped out through the third water pump [in order to improve the safety of the operation of the third water pump, two or three third water pumps can be arranged in parallel, so that when any third water pump is damaged, other third water pumps can be used for alternative operation (of course, a valve is arranged at the water inlet end of each third water pump, and only the valve at the water inlet of the enabled third water pump is opened)].

[0041] like Figure 4 and Figure 5 As shown, the above technical solution also includes a controller 15, a first temperature sensor 16 is provided in the regulating tank 1, a second temperature sensor 17 is provided at the sewage discharge pipe 6, the first valve 7, the second valve 8, the third valve 9 and the fourth valve 10 are all electrically controlled valves, the first temperature sensor 16, the second temperature sensor 17, the first valve 7, the second valve 8, the third valve 9, the fourth valve 10 and the third water pump 14 are all electrically connected to the controller 15, so that the entire paper mill sewage pretreatment unit has a high degree of intelligence, wherein the first valve and the second valve are opened selectively, and the third valve and the fourth valve are also opened selectively (the The controller can adopt an ARM series single-chip microcomputer, and the controller can be set in a control cabinet next to the regulating tank. When the first temperature sensor senses that the water temperature in the regulating tank exceeds 37°C, the third valve is closed and the fourth valve is opened. If the second temperature sensor monitors that the water temperature in the sewage discharge pipe exceeds 37°C at the same time, the first valve is opened and the second valve is closed. When the first temperature sensor senses that the water temperature in the regulating tank is lower than 37°C, the third valve is opened and the fourth valve is closed. At this time, the first valve is closed and the second valve is opened). Of course, only when the third water pump is turned on, the third valve and the fourth valve are selectively turned on.

[0042] In the above technical solution, a plurality of first temperature sensors 16 are arranged in the regulating pool 1, and the plurality of first temperature sensors 16 are distributed at intervals in the regulating pool 1, and the structure is simple, so that the water temperature of different areas in the regulating pool can be monitored (at this time, a plurality of 4-8 first temperature sensors 16 can be arranged, and they are distributed at different positions in the regulating pool, such as a first temperature sensor is arranged at each of the four corners of the regulating pool, and a first temperature sensor is arranged in the middle of the regulating pool. Only when at least two or three of the plurality of first temperature sensors measure a water temperature higher than 37°C, the water temperature in the regulating pool is assumed to exceed 37°C, otherwise it is deemed that the water temperature in the regulating pool is below 37°C. Since both the first temperature sensor and the second temperature sensor have errors due to sensitivity reasons, the measurement error value is allowed to be within ±0.5°C).

[0043] like Figure 3 As shown, the regulating tank 1 in the above technical solution is provided with a floating object collecting assembly 18, and the floating object collecting assembly 18 is used to collect floating objects floating on the water surface of the regulating tank 1, so that the floating object collecting assembly can be used to collect and recycle the floating paper fibers in the regulating tank (the floating object collecting assembly can be similar to the structure disclosed in the document No. CN105107240B "Device for treating floating objects in sewage").

[0044] The above technical solution also includes a slurry pool 19, which is used to collect the floating objects collected by the floating object collection assembly 18 and the solid matter settled at the bottom of the primary sedimentation tank 4, so that the floating objects in the regulating tank and the sediment in the primary sedimentation tank can be collected through the slurry pool (the slurry pool has a stirring paddle, which is equivalent to a stirring tank).

[0045] The slag outlet of the slurry pool 19 in the above technical solution is connected to the pulp tank 20 and the sludge pressing workshop 21 respectively, so that the components collected in the slurry pool can be returned to the papermaking system for reuse or discharged to the sludge pressing workshop to make mud bricks.

[0046] Example 2

[0047] This embodiment provides a paper mill wastewater treatment station, including the paper mill wastewater pretreatment unit as described in Embodiment 1, which has a simple structure and high wastewater treatment efficiency.

[0048] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0049] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A paper mill wastewater pretreatment unit, characterized in that: The invention comprises a regulating tank (1), a first cooling tower (2), a second cooling tower (3) and a primary sedimentation tank (4); a sewage discharge pipe (6) is connected to the water inlet of the first cooling tower (2) and a first valve (7) is arranged at the connection point; a water outlet of the first cooling tower (2) is connected to the regulating tank (1); the sewage discharge pipe (6) is also connected to the regulating tank (1) and a second valve (8) is arranged at the connection point; a water outlet of the regulating tank (1) is connected to the primary sedimentation tank (4) and a third valve (9) is arranged at the connection point; the water outlet of the regulating tank (1) is also connected to the water inlet of the second cooling tower (3) and a fourth valve (10) is arranged at the connection point between the two; and a water outlet of the second cooling tower (3) is connected to the primary sedimentation tank (4).

2. The paper mill wastewater pretreatment unit according to claim 1, characterized in that: It also comprises an accident pool (11), wherein an overflow port is arranged at the upper end of the regulating pool (1), the overflow port of the regulating pool (1) is connected to the accident pool (11), and the water outlet of the accident pool (11) is connected to the regulating pool (1) via a first water pump (12).

3. The paper mill wastewater pretreatment unit according to claim 2, characterized in that: It also includes a rainwater collection pool (13) arranged in the factory area, and the water outlet of the rainwater collection pool (13) is connected to the accident pool (11) through a second water pump (5).

4. The paper mill wastewater pretreatment unit according to claim 1, characterized in that: A third water pump (14) is provided at the water outlet of the regulating tank (1), and the water in the regulating tank (1) is pumped into the second cooling tower (3) or the primary sedimentation tank (4) by the third water pump (14).

5. The paper mill wastewater pretreatment unit according to claim 4, characterized in that: The invention also comprises a controller (15), a first temperature sensor (16) is arranged in the regulating tank (1), a second temperature sensor (17) is arranged at the sewage discharge pipe (6), the first valve (7), the second valve (8), the third valve (9) and the fourth valve (10) are all electrically controlled valves, and the first temperature sensor (16), the second temperature sensor (17), the first valve (7), the second valve (8), the third valve (9), the fourth valve (10) and the third water pump (14) are all electrically connected to the controller (15).

6. The paper mill wastewater pretreatment unit according to claim 4, characterized in that: A plurality of first temperature sensors (16) are arranged in the regulating pool (1), and the plurality of first temperature sensors (16) are distributed at intervals in the regulating pool (1).

7. The paper mill wastewater pretreatment unit according to claim 1, characterized in that: The regulating pond (1) is provided with a floating object collection component (18), and the floating object collection component (18) is used to collect floating objects floating on the water surface of the regulating pond (1).

8. The paper mill wastewater pretreatment unit according to claim 7, characterized in that: It also comprises a slurry pool (19), wherein the slurry pool (19) is used to collect the floating objects collected by the floating object collecting assembly (18) and the solid objects settled at the bottom of the primary sedimentation tank (4).

9. The paper mill wastewater pretreatment unit according to claim 8, characterized in that: The slag outlet of the slag slurry pool (19) is respectively connected to the pulp tank (20) and the sludge pressing workshop (21).

10. A paper mill wastewater treatment station, characterized in that: It comprises a paper mill wastewater pretreatment unit as described in any one of claims 1 to 9.

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