A fully automatic multi-stage separation system for treating polluted water

Abstract

The present invention relates to the field of sewage treatment, and in particular to a fully automatic multi-stage separation polluted water treatment system, comprising: a sewage treatment unit, for collecting sewage and sequentially performing coarse filtration, fine filtration and disinfection treatment; a data acquisition unit, for collecting demand information; a drainage monitoring unit, for determining the drainage state according to the effective working time or drainage frequency of different drainage ends, and determining the sewage pretreatment method according to the drainage state; a data analysis unit, for determining the analysis control method according to the difference state of sewage after pretreatment; a control and adjustment unit, for determining the outlet flow state according to the outlet flow change value and the outlet flow detection value, and adjusting the rotation speed according to the outlet flow state, or adjusting the swing period; in the present invention, the sewage treatment parameters are adjusted according to the actual sewage treatment effect, thereby improving the sewage treatment efficiency.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a fully automatic multi-stage separation polluted water treatment system. Background Art

[0002] Sewage treatment is of great significance to environmental protection and sustainable development in modern society. Through effective sewage treatment, pollution to natural water bodies can be reduced, water resources can be protected from destruction, and sustainable use of water resources can be ensured. Many factories that discharge a large amount of organic matter in wastewater, especially industries with high standards for sewage treatment, are equipped with multi-stage separation sewage treatment systems. However, in actual applications, the water quality of wastewater at the discharge end is unstable, and wastewater collected from different collection ends is mixed randomly, which can easily lead to the operating parameters of the sewage treatment system being unable to meet the actual purification needs, resulting in poor sewage treatment effects. Therefore, how to improve the treatment efficiency of the sewage treatment system is an urgent problem to be solved by technicians in this field.

[0003] Chinese Patent Publication No. CN113321296A discloses an MBR integrated equipment and its MBR sewage treatment method, the equipment comprises: a sewage pool, an inlet pipe is arranged above the sewage pool, a water suction pump is arranged on the right side of the sewage pool, the input end of the water suction pump is fixedly connected to the water pipe, the other side of the water pipe is fixedly connected to the MBR membrane assembly, the MBR membrane assembly is located in the sewage pool, a clean water pool is arranged on the right side of the water suction pump, the output end of the water suction pump is output to the clean water pool through the fixed water pipe, a backwash pump is arranged on the right side of the clean water pool, the backwash pump is fixedly connected to the MBR membrane assembly through the water pipe, an air pump is arranged on the left side of the sewage pool, the output end of the air pump is fixedly connected to the aeration assembly, the aeration assembly is located at the bottom of the MBR membrane assembly in the sewage pool, the MBR membrane assembly comprises a bracket, the bracket is fixedly connected in the sewage pool, the diaphragm assembly is fixedly connected in the bracket, the diaphragm assembly comprises a connector, and a connecting pipe is arranged in the connector. It can be seen that the MBR integrated equipment and its MBR sewage treatment method have the following problems: when applied to sewage treatment scenarios with multiple discharge ends, the sewage treatment working mode cannot be adjusted according to the actual sewage pollution situation, resulting in a single working mode that cannot effectively meet the actual sewage treatment needs. Summary of the invention

[0004] To this end, the present invention provides a fully automatic multi-stage separation polluted water treatment system to overcome the problem that sewage treatment equipment in the prior art cannot adjust the sewage treatment mode according to the actual sewage pollution situation, resulting in a single working mode that cannot effectively meet the actual sewage treatment needs.

[0005] To achieve the above object, the present invention provides a fully automatic multi-stage separation polluted water treatment system, comprising:

[0006] The sewage treatment unit is used to collect sewage and sequentially perform coarse filtration, fine filtration and disinfection treatment;

[0007] A data collection unit connected to the sewage treatment unit for collecting demand information;

[0008] A drainage monitoring unit, which is connected to the sewage treatment unit and the data acquisition unit, and is used to determine the drainage status according to the effective working time or drainage frequency of different drainage ends, and determine the sewage pretreatment method according to the drainage status;

[0009] A data analysis unit connected to the sewage treatment unit and the data acquisition unit, for determining a sewage difference state according to the organic matter content of the pre-treated sewage and the sewage proportion at the second drainage end, and determining an analysis control method according to the sewage difference state;

[0010] a control and adjustment unit connected to the sewage treatment unit and the data acquisition unit, for determining an outlet flow state according to an outlet flow change value and an outlet flow detection value, and adjusting a rotation speed of a first rotation of the rotating shaft, or adjusting a rotation period of a second rotation of the rotating shaft according to the outlet flow state;

[0011] The rotation speed is adjusted or the rotation period is adjusted in different analysis control modes.

[0012] Furthermore, the sewage treatment unit comprises:

[0013] A drainage module, comprising a first drainage end connected to the production end and a second drainage end connected to the outdoor collection end, for collecting sewage from different areas;

[0014] A coarse filtration module, which is connected to the drainage module and is used to remove solid impurities in the water by coarse filtration of the sewage collected at the drainage end;

[0015] A membrane reaction module, which is connected to the coarse filtration module and is used to perform fine filtration and purification on the sewage after the coarse filtration;

[0016] A disinfection module, which is connected to the membrane reaction module and is used to disinfect the sewage discharged from the membrane reaction module;

[0017] The membrane reaction module comprises a water tank, a membrane reactor and a rotating shaft. The membrane reactor is arranged inside the water tank and connected to the rotating shaft. The rotating shaft is externally connected to a control device for controlling the rotating shaft to perform a first rotation and a second rotation.

[0018] The first rotation is that the rotating shaft rotates in situ around its own central axis, and the second rotation is that the rotating shaft rotates along the central axis of the water tank. During the second rotation, there is an angle between the central axis of the rotating shaft and the central axis of the water tank.

[0019] When the rotating shaft rotates, the membrane reactor is driven to rotate in the water tank.

[0020] Further, the drainage monitoring unit determines the drainage state according to the effective working time of the first drainage end and the drainage frequency of the second drainage end, including that the effective working time of the first drainage end is within the first preset effective working time range or the drainage frequency of the second drainage end is greater than the preset drainage frequency, or,

[0021] The effective working time of the first drainage end is within a second preset effective working time range and the drainage frequency of the second drainage end is less than or equal to the preset drainage frequency.

[0022] Furthermore, the drainage monitoring unit determines a sewage pretreatment method according to the drainage status, including sequentially treating the sewage from the first drainage end and the second drainage end, or mixing the sewage from the first drainage end and the sewage from the second drainage end.

[0023] Furthermore, the data analysis unit determines whether to introduce sewage intermittently according to the difference state of the sewage, and the interval time between two adjacent introductions of sewage is positively correlated with the difference degree of the sewage.

[0024] Further, the data analysis unit determines the sewage difference state according to the organic matter content of the pretreated sewage and the sewage proportion at the second drainage end, including that the organic matter content of the pretreated sewage is greater than the preset organic matter content or the sewage proportion at the second drainage end is greater than the preset reference proportion.

[0025] Alternatively, the organic matter content of the pretreated sewage is less than a preset organic matter content and the sewage proportion at the second drainage end is less than or equal to a preset reference proportion.

[0026] Furthermore, the control and adjustment unit periodically determines and analyzes the control mode according to the water flow state, including adjusting the rotation speed or adjusting the rotation period.

[0027] Furthermore, the control and adjustment unit determines the water outflow state according to the water outflow change value and the water outflow detection value, including that the water outflow reference value is less than or equal to the preset water outflow reference value, or that the water outflow reference value is greater than the preset water outflow reference value and the water outflow change value is greater than the preset water outflow change value.

[0028] Furthermore, the control and regulation unit increases and regulates the rotation speed according to the water flow reference value.

[0029] The increase in the rotation speed is negatively correlated with the reference value of the water outlet flow rate;

[0030] The rotation speed is the speed of the first rotation of the rotation shaft.

[0031] Furthermore, the control and regulation unit performs a reduction regulation on the rotation period according to the change value of the water flow rate.

[0032] The reduction amount of the rotation period is negatively correlated with the change value of the water outlet flow rate;

[0033] The rotation period is the interval between two adjacent second rotations of the rotation axis.

[0034] Compared with the prior art, the beneficial effect of the present invention lies in that, in the technical scheme of the present invention, the sewage at the production end and the outdoor collected sewage are distinguished, and the drainage status is determined according to the effective working time of the first drainage end and the drainage frequency of the second drainage end, respectively. The drainage status is used to characterize the frequency of outdoor precipitation and the influence of the sewage discharge at the production end on the sewage quality, so as to select a more effective sewage pretreatment method accordingly, so that the sewage pretreatment method is more in line with the actual working scene, avoiding the problem of poor sewage treatment efficiency caused by direct mixing of sewage of different water qualities for sewage treatment, and further improving the sewage treatment effect of the present invention.

[0035] Furthermore, the data analysis unit in the present invention determines whether to introduce sewage intermittently according to the difference state of sewage, and determines whether the inorganic content in the sewage will affect the operating stability of the membrane reaction module through the difference state of sewage. Therefore, by intermittently introducing sewage, the problem of excessive environmental fluctuations in the sewage membrane reaction module caused by the introduction of a large amount of organic matter is avoided, thereby improving the operating stability of the membrane reaction module.

[0036] Furthermore, the control and regulation unit in the present invention periodically determines and analyzes the control mode according to the outlet water flow state, effectively characterizes the blockage condition of the membrane reaction module through the outlet water flow state, and selects different regulation modes according to different outlet water flow states, thereby effectively improving the treatment effect of the membrane reaction module.

[0037] Furthermore, in the present invention, the membrane reactor is arranged inside the water tank and connected to the rotating shaft. The rotating shaft is externally connected to a control device for controlling the rotating shaft to perform a first rotation and a second rotation. The rotating shaft performs in-situ self-rotation around its own central axis, thereby increasing the shear force of the sewage entering the membrane reactor and increasing the uniformity of sludge distribution in the water tank, thereby effectively alleviating the blockage of the membrane reactor. Moreover, through the second rotation of the rotating shaft along the central axis of the water tank, the impact force at the sewage inlet end of the membrane reactor is changed, and the blockage of the membrane reactor is alleviated by the fluctuating impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a unit connection diagram of a fully automatic multi-stage separation polluted water treatment system according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of a membrane reaction module according to an embodiment of the present invention;

[0040] Figure 3 This is a flow chart of determining a sewage pretreatment method according to a drainage state according to an embodiment of the present invention;

[0041] Figure 4 This is a flow chart of an embodiment of the present invention for determining an analysis control method according to the water flow state;

[0042] In the figure: water tank 1, membrane reactor 2, rotating shaft 3, water outlet pipe 4, mud discharge pipe 5, suction pump 6. DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0045] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0046] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] See also Figure 1 As shown, it is a unit connection diagram of a fully automatic multi-stage separation polluted water treatment system according to an embodiment of the present invention. The present invention provides a fully automatic multi-stage separation polluted water treatment system, comprising:

[0048] The sewage treatment unit is used to collect sewage and sequentially perform coarse filtration, fine filtration and disinfection treatment;

[0049] A data collection unit connected to the sewage treatment unit for collecting demand information;

[0050] A drainage monitoring unit, which is connected to the sewage treatment unit and the data acquisition unit, and is used to determine the drainage status according to the effective working time or drainage frequency of different drainage ends, and determine the sewage pretreatment method according to the drainage status;

[0051] A data analysis unit connected to the sewage treatment unit and the data acquisition unit, for determining a sewage difference state according to the organic matter content of the pre-treated sewage and the sewage proportion at the second drainage end, and determining an analysis control method according to the sewage difference state;

[0052] a control and adjustment unit connected to the sewage treatment unit and the data acquisition unit, for determining an outlet flow state according to an outlet flow change value and an outlet flow detection value, and adjusting a rotation speed of a first rotation of the rotating shaft, or adjusting a rotation period of a second rotation of the rotating shaft according to the outlet flow state;

[0053] The rotation speed is adjusted or the rotation period is adjusted in different analysis control modes.

[0054] The demand information includes the effective working time of the first drainage end, the drainage frequency of the second drainage end, the organic matter content of the pretreated sewage, and the maximum water flow in the outlet pipe.

[0055] See also Figure 2 As shown, it is a schematic diagram of the structure of the membrane reaction module of an embodiment of the present invention, and the sewage treatment unit includes:

[0056] A drainage module, comprising a first drainage end connected to the production end and a second drainage end connected to the outdoor collection end, for collecting sewage from different areas;

[0057] A coarse filtration module, which is connected to the drainage module and is used to remove solid impurities in the water by coarse filtration of the sewage collected at the drainage end;

[0058] A membrane reaction module, which is connected to the coarse filtration module and is used to perform fine filtration and purification on the sewage after the coarse filtration;

[0059] A disinfection module, which is connected to the membrane reaction module and is used to disinfect the sewage discharged from the membrane reaction module;

[0060] The membrane reaction module includes a water tank 1, a membrane reactor 2 and a rotating shaft 3. The membrane reactor 2 is arranged inside the water tank 1 and connected to the rotating shaft 3. The rotating shaft 3 is externally connected to a control device for controlling the rotating shaft 3 to perform a first rotation and a second rotation.

[0061] The first rotation is that the rotating shaft 3 rotates in situ around its own central axis, and the second rotation is that the rotating shaft 3 rotates along the central axis of the water tank 1. During the second rotation, there is an angle between the central axis of the rotating shaft 3 and the central axis of the water tank 1.

[0062] When the rotating shaft 3 rotates, the membrane reactor 2 is driven to rotate in the water tank 1;

[0063] The membrane reactor 2 is connected to a water outlet pipe 4, in which a power pump is provided to discharge the filtered sewage. The membrane reactor 2 is also connected to a sludge discharge pipe 5, which is used to suck the sludge out of the water tank 1 through a suction pump 6.

[0064] The water outlet pipe 4 has bending and deformation capabilities.

[0065] Please refer to Figure 1 , Figure 2 as well as Figure 3 As shown, the drainage monitoring unit determines the drainage state according to the effective working time of the first drainage end and the drainage frequency of the second drainage end, including a first preset drainage state in which the effective working time of the first drainage end is within a first preset effective working time range or the drainage frequency of the second drainage end is greater than a preset drainage frequency,

[0066] Or a second preset drainage state in which the effective working time of the first drainage end is within a second preset effective working time range and the drainage frequency of the second drainage end is less than or equal to the preset drainage frequency.

[0067] The present invention is applied to factory sewage treatment. The first drainage end is connected to the production end of the factory to collect factory production wastewater. The second drainage end is connected to the outdoor sewage / rainwater collection device to collect outdoor drainage. The effective working time of the first drainage end is the operating time of the target discharge workshop. The drainage frequency of the second drainage end is related to the rainfall and the number of rainfalls.

[0068] Among them, the target emission workshop is set by the user, and the workshop whose organic matter content in the discharged wastewater is greater than the user's demand is recorded as the target emission workshop. The operating time of the target emission workshop can be determined by a monitoring device to monitor the operating time of the machine that will discharge wastewater; if the rainfall is greater than the effective rainfall, the drainage frequency of the second drainage end = the number of rainfalls in the most recent monitoring period, if the rainfall is less than the effective rainfall, the drainage frequency of the second drainage end is 0.

[0069] The values ​​within the first preset effective working time range are all greater than the preset effective working time reference value, and the values ​​within the second preset effective working time range are all less than the preset effective working time reference value. The user can determine the preset effective working time reference value according to the emission capacity of the target emission workshop. The greater the emission capacity of the target emission workshop, the smaller the preset effective working time reference value. A value of the preset effective working time reference value is provided, which is 6h. The effective precipitation can be set by the user. Due to the fact that the initial outdoor rainwater in the factory environment is often accompanied by a large amount of sludge and impurity particles, the greater the effective precipitation, the smaller the sludge content of the outdoor collected sewage in a single monitoring period. A value of the effective precipitation is provided, which is 25mm, and the monitoring period is 15 days.

[0070] Specifically, the drainage monitoring unit determines the sewage pretreatment method according to the drainage status, including treating the sewage from the first drainage end and the second drainage end in sequence under the first preset drainage state, or mixing the sewage from the first drainage end and the second drainage end under the second preset drainage state.

[0071] Specifically, when processing sequentially, the drainage monitoring unit will transmit sequential processing reminder information to the user, reminding the user to manually control and adjust the sewage treatment unit; when processing mixedly, the drainage monitoring unit controls the sewage treatment unit to pass the sewage from the first drainage end and the second drainage end into a buffer tank for mixing.

[0072] Specifically, the data analysis unit determines whether to introduce sewage intermittently according to the difference state of sewage, and the interval time between two adjacent sewage introductions is positively correlated with the difference degree of sewage.

[0073] Specifically, if the organic matter content of the pretreated sewage is greater than the preset organic matter content or the proportion of sewage at the second drainage end is greater than the preset reference proportion, the sewage is intermittently introduced to pass the mixed sewage in the buffer tank into the sewage treatment unit at intervals, and the amount of sewage introduced each time is the same; sewage difference = organic matter content / preset organic matter content + proportion of sewage at the second drainage end / preset reference proportion. It is worth noting that if the organic matter content of the pretreated sewage is greater than the preset organic matter content and the proportion of sewage at the second drainage end is greater than the preset reference proportion, the introduction interval time adopts the maximum introduction interval time, which is set by the user, and the maximum processing time required for the amount of sewage introduced each time is the maximum introduction interval time.

[0074] If the organic matter content of the pretreated sewage is less than the preset organic matter content and the sewage proportion at the second drainage end is less than or equal to the preset reference proportion, there is no need to use intermittent sewage introduction.

[0075] Specifically, the data analysis unit determines the sewage difference state according to the organic matter content of the pretreated sewage and the sewage proportion at the second drainage end, including a first sewage difference state in which the organic matter content of the pretreated sewage is greater than a preset organic matter content or the sewage proportion at the second drainage end is greater than a preset reference proportion,

[0076] Or, a second sewage difference state in which the organic matter content of the pretreated sewage is less than a preset organic matter content and the sewage proportion at the second drainage end is less than or equal to a preset reference proportion.

[0077] Specifically, the organic matter content is the COD detection value of the mixed sewage in the buffer tank. The COD detection is obtained through the COD sensor in the buffer tank. The preset organic matter content = COD detection value in the membrane reaction module + 200 mg / L. The sewage at the second drainage end accounts for = the amount of sewage at the second drainage end / (the amount of sewage at the first drainage end + the amount of sewage at the second drainage end). The preset reference ratio is 50%.

[0078] Specifically, the control and adjustment unit periodically determines and analyzes the control mode according to the water flow state, including adjusting the rotation speed or adjusting the rotation period.

[0079] Specifically, the control and adjustment unit determines the water outflow state according to the water outflow change value and the water outflow detection value, including a first water outflow state in which the water outflow reference value is less than or equal to a preset water outflow reference value, or a second water outflow state in which the water outflow reference value is greater than the preset water outflow reference value and the water outflow change value is greater than the preset water outflow change value.

[0080] Specifically, the change in water flow rate is the value obtained by subtracting the maximum water flow rate in the water outlet pipe detected in the current monitoring cycle from the maximum water flow rate in the water outlet pipe detected in the most recent monitoring cycle from the current monitoring cycle. The maximum water flow rate is the maximum value detected by the water flow monitoring device. The unit of water flow rate is m 3 / min, the preset water flow rate change value is 10% of the preset water flow rate reference value, and the preset water flow rate detection value is 0.5m 3 / min, the user can determine the value of the preset water outlet flow detection value according to the filtration capacity of the membrane reactor in the actual application scenario.

[0081] Specifically, the control and regulation unit increases the rotation speed according to the water flow reference value under the first water flow state.

[0082] The increase in the rotation speed is negatively correlated with the reference value of the water outlet flow rate;

[0083] The rotation speed is the speed of the first rotation of the rotation shaft.

[0084] Specifically, the second water flow state of the control and adjustment unit is reduced and adjusted according to the change value of the water flow for the rotation period.

[0085] The reduction amount of the rotation period is negatively correlated with the change value of the water outlet flow rate;

[0086] The rotation period is the interval between two adjacent second rotations of the rotation axis.

[0087] The rotation cycle is the interval between each second rotation of the rotating shaft. The rotating shaft performs a second rotation after each rotation cycle, and the rotating shaft continues to perform the first rotation.

[0088] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fully automatic multi-stage separation system for treating polluted water, characterized in that: include: The sewage treatment unit is used to collect sewage and sequentially perform coarse filtration, fine filtration and disinfection treatment, and the sewage treatment unit includes: A drainage module, comprising a first drainage end connected to the production end and a second drainage end connected to the outdoor collection end, for collecting sewage from different areas; A coarse filtration module, which is connected to the drainage module and is used to remove solid impurities in the water by coarse filtration of the sewage collected at the drainage end; A membrane reaction module, which is connected to the coarse filtration module and is used to perform fine filtration and purification on the sewage after the coarse filtration; A disinfection module, which is connected to the membrane reaction module and is used to disinfect the sewage discharged from the membrane reaction module; The membrane reaction module comprises a water tank, a membrane reactor and a rotating shaft. The membrane reactor is arranged inside the water tank and connected to the rotating shaft. The rotating shaft is externally connected to a control device for controlling the rotating shaft to perform a first rotation and a second rotation. The first rotation is that the rotating shaft rotates in situ around its own central axis, and the second rotation is that the rotating shaft rotates along the central axis of the water tank. During the second rotation, there is an angle between the central axis of the rotating shaft and the central axis of the water tank. When the rotating shaft rotates, it drives the membrane reactor to rotate in the water tank; A data collection unit connected to the sewage treatment unit for collecting demand information; A drainage monitoring unit, which is connected to the sewage treatment unit and the data acquisition unit, and is used to determine the drainage status according to the effective working time or drainage frequency of different drainage ends, and determine the sewage pretreatment method according to the drainage status; A data analysis unit is connected to the sewage treatment unit and the data collection unit, and is used to determine the sewage difference state according to the organic matter content of the pre-treated sewage and the sewage proportion at the second drainage end. and determining to adjust the rotation speed or the rotation period according to the difference state of the sewage; A control and regulation unit is connected to the sewage treatment unit and the data acquisition unit, and is used to determine the state of the water flow rate according to the water flow rate change value and the water flow rate detection value. And the rotation speed of the first rotation of the rotating shaft is adjusted according to the water flow state, or the rotation period of the second rotation of the rotating shaft is adjusted.

2. The fully automatic multi-stage separation polluted water treatment system according to claim 1 is characterized in that: The drainage monitoring unit determines the drainage state according to the effective working time of the first drainage end and the drainage frequency of the second drainage end, including that the effective working time of the first drainage end is within the first preset effective working time range or the drainage frequency of the second drainage end is greater than the preset drainage frequency, Or the effective working time of the first drainage end is within a second preset effective working time range and the drainage frequency of the second drainage end is less than or equal to the preset drainage frequency.

3. The fully automatic multi-stage separation polluted water treatment system according to claim 2 is characterized in that: The drainage monitoring unit determines the sewage pretreatment method according to the drainage status, including sequentially treating the sewage from the first drainage end and the second drainage end, or mixing the sewage from the first drainage end and the sewage from the second drainage end.

4. The fully automatic multi-stage separation polluted water treatment system according to claim 3 is characterized in that: The data analysis unit determines whether to introduce sewage intermittently according to the difference state of sewage. The interval time between two adjacent sewage introductions is positively correlated with the difference degree of sewage.

5. The fully automatic multi-stage separation polluted water treatment system according to claim 4 is characterized in that: The data analysis unit determines the sewage difference state according to the organic matter content of the pretreated sewage and the sewage proportion at the second drainage end, including that the organic matter content of the pretreated sewage is greater than the preset organic matter content or the sewage proportion at the second drainage end is greater than the preset reference proportion. Alternatively, the organic matter content of the pretreated sewage is less than a preset organic matter content and the sewage proportion at the second drainage end is less than or equal to a preset reference proportion.

6. The fully automatic multi-stage separation polluted water treatment system according to claim 5 is characterized in that: The control and adjustment unit periodically determines and analyzes the control mode according to the water flow state, including adjusting the rotation speed or adjusting the rotation period.

7. The fully automatic multi-stage separation polluted water treatment system according to claim 6 is characterized in that: The control and adjustment unit determines the water outflow state according to the water outflow change value and the water outflow detection value, including that the water outflow reference value is less than or equal to the preset water outflow reference value, or that the water outflow reference value is greater than the preset water outflow reference value and the water outflow change value is greater than the preset water outflow change value.

8. The fully automatic multi-stage separation polluted water treatment system according to claim 7 is characterized in that: The control and regulation unit increases and regulates the rotation speed according to the water flow reference value. The increase in the rotation speed is negatively correlated with the reference value of the water flow rate; The rotation speed is the speed of the first rotation of the rotation shaft.

9. The fully automatic multi-stage separation polluted water treatment system according to claim 8 is characterized in that: The control and regulation unit reduces and regulates the rotation cycle according to the change in the water flow rate. The reduction amount of the rotation period is negatively correlated with the change value of the water outlet flow rate; The rotation period is the interval between two adjacent second rotations of the rotation axis.

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