Suspended mud-water separation device for sewage treatment

Abstract

The invention relates to the technical field of sewage treatment, in particular to a suspended mud-water separation device for sewage treatment, which comprises an aerobic tank water inlet pipe, a sludge sinking separation area, a mud-water separation area and a clear water outlet weir which are sequentially arranged from bottom to top, a data acquisition module; the operation process judgment module is used for determining whether the operation stability of the suspended mud-water separation device is qualified or not based on the granulation degree index; the floc quality judgment module is used for determining whether the quality of the sludge floc is qualified or not based on the Zeta potential of the sludge floc in the sludge-water separation area and optimizing the steam stripping opening degree based on the effective water passing area; the sludge quality judgment module is used for determining whether the treatment capacity of the sludge is qualified or not based on the oxygen consumption rate of the sludge in the sludge-water separation area, and the sludge reduction judgment module is used for determining whether the sludge reduction effect is qualified or not based on the sludge yield coefficient of the aerobic tank so as to optimize a preset granulation index. The operation stability of the suspended mud-water separation device is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a suspended sludge-water separation device for wastewater treatment. Background Technology

[0002] With the increasing severity of global water scarcity and water pollution, wastewater treatment has become a crucial link in protecting the ecological environment and human health. Sludge-water separation, as a vital final unit in biological wastewater treatment processes, directly determines effluent quality and sludge treatment costs through its separation efficiency. Traditional sludge-water separation mainly relies on secondary sedimentation tanks. While technically mature, it suffers from drawbacks such as large footprint, weak resistance to shock loads, and sensitivity to sludge settling performance. Fluctuations in influent water quality or sludge expansion can easily lead to sludge-laden effluent and unstable treatment results. Membrane bioreactors, while achieving efficient solid-liquid separation and increasing sludge concentration, are prone to membrane fouling and clogging, requiring frequent cleaning and replacement. This results in high energy consumption, high operating and maintenance costs, short membrane lifespan, and strict requirements for influent water quality. Other technologies, such as air flotation and centrifugal separation, face challenges related to high energy consumption, complex equipment, and high operating costs. To address the aforementioned technical bottlenecks, it is imperative to develop a sludge-water separation device that combines the reliability of traditional processes with the high efficiency of new technologies. Suspended sludge-water separation devices have emerged to meet this need. These devices achieve solid-liquid separation through a dynamically suspended sludge layer or a suspended media layer, aiming to combine advantages such as efficient sludge retention, resistance to shock loads, low energy consumption, and ease of maintenance. They meet the dual requirements of sludge-water separation efficiency and operational stability for wastewater treatment scenarios of different scales, and are particularly suitable for wastewater treatment systems that require enhanced sludge retention and reflux control, and seek sludge reduction effects.

[0003] Chinese Patent Application Publication No. CN102805956A discloses a vertical pipe-type sludge-water separation treatment device. Its main feature is that the tank wall of the vertical pipe-type sludge-water separation treatment unit is a pipe wall, the tank body has a bottom plate, and the upper part is a top plate with an inspection well on the top plate. Each sludge-water separation treatment unit is internally separated by a space partition plate and a packing material placement plate. Suspended packing material is located below the packing material placement plate. A sedimentation sludge guide pipe is located on the space partition plate, and there are water passage holes on the packing material placement plate. The upper opening of the cleaning pipe is at the inspection well, and the lower opening is at the space partition plate. Inlet and outlet pipes are provided on the upper part of the packing material placement plate and between the packing material placement plate and the space partition plate. The sedimentation sludge guide pipe is installed at the sedimentation hole, and the sludge discharge port of the guide pipe is located below the space partition plate. This device simplifies construction, separates wastewater treatment from sludge treatment, reduces the impact of sludge on wastewater treatment, and is beneficial for stabilizing wastewater quality and improving process controllability.

[0004] The existing technologies also have the following problems: existing sewage treatment sludge-water separation technologies generally have large footprints, weak resistance to shock loads, and are prone to sludge expansion or membrane module blockage. At the same time, the sludge-water separation device is prone to poor operation stability due to excessive sludge production and fluctuations in operating conditions. Summary of the Invention

[0005] Therefore, the present invention provides a suspended sludge-water separation device for sewage treatment, which overcomes the problems of large footprint, weak resistance to shock loads, easy sludge expansion or membrane module blockage in existing sewage treatment sludge-water separation technologies, as well as the poor operational stability of the sludge-water separation device due to excessive sludge production and fluctuations in operating conditions.

[0006] To achieve the above objectives, the present invention provides a suspended sludge-water separation device for wastewater treatment, comprising: The aerobic tank inlet pipe, sludge settling and separation zone, mud-water separation zone and clear water outlet weir are arranged sequentially from bottom to top. The mud-water separation zone is connected to the sludge escape channel, the sludge escape channel is connected to the inlet end of the stripping pipe, and the stripping pipe is equipped with a stripping control valve. The data acquisition module includes a laser particle size distribution sensor for acquiring particle distribution characteristics in wastewater, a flow sensor for acquiring real-time flow rate, and a dissolved oxygen sensor for determining the oxygen consumption rate of sludge in the sludge-water separation zone. The operation process determination module is used to determine whether the operation stability of the suspended sludge-water separation device is qualified based on the comparison result of the particle size index of the sewage in the sludge-water separation zone and the preset particle size index. The floc quality determination module responds to operational instability issues by determining whether the sludge floc quality is acceptable based on the Zeta potential of the sludge flocs in the sludge-water separation zone, and optimizes the stripping opening of the stripping control valve based on the effective water flow area of ​​the sludge-water separation zone under acceptable conditions. The sludge quality assessment module, in response to the sludge flocs failing to meet quality standards, determines whether the sludge treatment capacity is up to standard based on the oxygen consumption rate of the sludge in the sludge-water separation zone. The sludge reduction determination module is used to determine whether the sludge reduction effect is qualified based on the sludge yield coefficient of the aerobic tank, and to optimize the preset granulation index based on the condition that the sludge reduction effect is unqualified.

[0007] Furthermore, the degree of granulation is a weighted sum of the suspended solids concentration coefficient, the median particle size coefficient, and the proportion coefficient of colloidal particles.

[0008] Furthermore, the operation process determination module determines that the operation stability of the suspended mud-water separation device is unqualified based on the comparison result that the particle size index is greater than the preset particle size index.

[0009] Furthermore, under the condition that the operation stability of the suspended sludge-water separation device is unqualified, the floc quality determination module determines that the sludge floc quality is unqualified based on the comparison result that the absolute value of the Zeta potential is greater than the first preset potential or less than the second preset potential.

[0010] Furthermore, under the condition that the operation stability of the suspended sludge-water separation device is unqualified, the floc quality determination module determines that the sludge floc quality is qualified based on the comparison result that the absolute value of the Zeta potential is less than or equal to the first preset potential and greater than or equal to the second preset potential.

[0011] Furthermore, under the condition that the sludge flocs are of qualified quality, the floc quality determination module sets several opening adjustment coefficients to optimize the stripping opening of the stripping control valve based on the area ratio of the effective water passage area to the preset water passage area and the comparison result of the preset area ratio.

[0012] Furthermore, under the condition that the sludge floc quality is unqualified, the sludge quality judgment module determines that the sludge treatment capacity is qualified based on the comparison result that the oxygen consumption rate of the sludge is greater than or equal to a preset rate.

[0013] Furthermore, under the condition that the sludge floc quality is unqualified, the sludge quality judgment module determines that the sludge treatment capacity is unqualified based on the comparison result that the oxygen consumption rate of the sludge is less than the preset rate. The sludge quality determination module sets several opening correction coefficients based on the relative difference between the preset oxygen consumption rate and the oxygen consumption rate to adjust the stripping opening.

[0014] Furthermore, under the condition that the sludge treatment capacity is qualified, the sludge reduction judgment module determines that the sludge reduction effect is unqualified based on the comparison result that the sludge yield coefficient is greater than the preset yield coefficient.

[0015] Furthermore, under the condition that the sludge reduction effect is unqualified, the sludge reduction judgment module sets several index adjustment coefficients to increase the preset granulation index based on the comparison result of the relative difference between the sludge yield coefficient and the preset yield coefficient and the relative difference between the preset yield coefficients.

[0016] Compared with the prior art, the beneficial effects of the present invention are that, in the prior art, the operational stability of mud-water separation devices is easily misjudged due to the decline in separation efficiency. Based on the synergistic effect of suspended solids concentration, median particle size, and proportion of colloidal particles, a particle size index is constructed by weighted summation. This breaks through the limitations of traditional single-parameter judgment, accurately quantifies the actual separation efficiency of the mud-water separation zone from multiple dimensions, captures the operating status of the core functional area of ​​the device from the root, avoids misjudgment caused by fluctuations in operating conditions, and thus ensures that the operating status of the device can be accurately controlled, thereby improving the operational stability of the suspended mud-water separation device.

[0017] Furthermore, this invention addresses the problems in existing technologies where sludge-water separation devices cannot accurately pinpoint the root cause of faults and where blind and ineffective adjustments occur when operation is unstable. It employs a floc quality determination mechanism based on Zeta potential, where the absolute value range of the potential determines the floc cohesion and settling properties. When operational stability is unsatisfactory, the invention first distinguishes between floc quality issues and device operation problems. Then, it sets an opening adjustment coefficient based on the area ratio gradient. By optimizing the opening of the stripping control valve, it achieves precise matching of sludge return rate with sedimentation volume, accurately pinpointing stability issues caused by untimely sludge return, quickly removing deposited sludge, and restoring normal water flow space in the separation zone. This avoids interference from blind adjustments to the device's operation, thereby further improving the operational stability of the suspended sludge-water separation device.

[0018] Furthermore, this invention addresses the problem in existing technologies where the sludge treatment capacity cannot be determined when the sludge floc quality is substandard, and where insufficient sludge activity exacerbates operational instability. It employs an oxygen consumption rate based on microbial aerobic respiration to determine the sludge floc quality. When the sludge floc quality is substandard, a dissolved oxygen sensor at the bottom of the sludge-water separation zone captures the dissolved oxygen decay pattern to determine the oxygen consumption rate, accurately assessing the sludge treatment capacity. Then, based on the relative difference between the preset and actual oxygen consumption rates, an opening correction coefficient is set to adjust the stripping opening, enabling rapid replacement of exhausted sludge with fresh activated sludge. This improves sludge activity and floc quality, completely resolving the problem of reduced separation efficiency due to insufficient sludge treatment capacity, thereby further enhancing the operational stability of the suspended sludge-water separation device.

[0019] Furthermore, this invention addresses the issues in existing technologies where sludge reduction is inadequate, and excessive sludge production can easily lead to device blockage and decreased stability. Based on a sludge yield coefficient to quantify the rationality of system sludge production, when the sludge reduction effect is unsatisfactory, an index adjustment coefficient is set according to the relative difference in yield. This optimizes the preset granulation index to adapt to the naturally low sludge granulation conditions, preventing excessive sludge production from clogging separation components and encroaching on the water passage area. This achieves dynamic matching between the stability judgment benchmark and actual operating conditions, ensuring stable operation of the device under harsh conditions, thereby further improving the operational stability of the suspended sludge-water separation device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the suspended sludge-water separation device for sewage treatment placed in an aerobic tank according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a suspended sludge-water separation device for wastewater treatment according to an embodiment of the present invention; Figure 3 This is a structural block diagram of a suspended sludge-water separation device for wastewater treatment according to an embodiment of the present invention; Figure 4 This is a flowchart for determining whether the operational stability of a suspended mud-water separation device meets the requirements in an embodiment of the present invention; In the diagram: 1. Aerobic tank, 2. Aerobic tank inlet pipe, 3. Sludge settling and separation zone, 4. Sludge-water separation zone, 5. Clear water effluent weir, 6. Sludge escape channel, 7. Steam stripping pipe, 8. Steam stripping control valve, 9. Clear water siphon effluent hose, 10. Effluent control valve. Detailed Implementation

[0021] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0022] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0024] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] Please see Figures 1-4 As shown, Figure 1 This is a schematic diagram of the structure of the suspended sludge-water separation device for sewage treatment placed in an aerobic tank according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a suspended sludge-water separation device for wastewater treatment according to an embodiment of the present invention; Figure 3 This is a structural block diagram of a suspended sludge-water separation device for wastewater treatment according to an embodiment of the present invention; Figure 4 This is a flowchart for determining whether the operational stability of a suspended mud-water separation device is up to standard in an embodiment of the present invention.

[0026] This invention relates to a suspended sludge-water separation device for wastewater treatment. The suspended sludge-water separation device has a modular structure and is entirely suspended below the liquid surface of the aerobic tank 1, comprising: The aerobic tank inlet pipe 2, sludge settling and separation zone 3, mud-water separation zone 4, and clear water outlet weir 5 are arranged sequentially from bottom to top; The aerobic tank inlet pipe 2 is set at a 45° upward angle; The mud-water separation zone 4 is connected to the sludge escape channel 6, the sludge escape channel 6 is connected to the inlet end of the stripping pipe 7, and the output end of the stripping pipe 7 flows back to the aerobic tank 1. The stripping pipe 7 is equipped with a stripping control valve 8. The clear water outlet weir 5 is connected to a clear water siphon outlet hose 9 for allowing clear water to flow out. The outlet end of the clear water siphon outlet hose 9 is equipped with an outlet control valve 10. The outlet position of the clear water siphon outlet hose 9 is lower than the liquid level of the aerobic tank 1. The data acquisition module includes a laser particle size distribution sensor for acquiring particle distribution characteristics in wastewater, a flow sensor for acquiring real-time flow rate, and a dissolved oxygen sensor for determining the oxygen consumption rate of sludge in the sludge-water separation zone 4. The operation process determination module is used to determine whether the operation stability of the suspended sludge-water separation device is qualified based on the comparison result of the particle size index of the sewage in the sludge-water separation zone 4 and the preset particle size index. The floc quality determination module responds to the failure of operational stability by determining whether the sludge floc quality is qualified based on the Zeta potential of the sludge flocs in the sludge-water separation zone 4, and optimizes the stripping opening of the stripping control valve 8 based on the effective water flow area of ​​the sludge-water separation zone 4 under qualified conditions. The sludge quality assessment module, in response to the sludge flocs failing to meet quality standards, determines whether the sludge treatment capacity is up to standard based on the oxygen consumption rate of the sludge in the sludge-water separation zone 4. The sludge reduction determination module is used to determine whether the sludge reduction effect is qualified based on the sludge yield coefficient of aerobic tank 1, and to optimize the preset granulation index based on the condition that the sludge reduction effect is unqualified.

[0027] Specifically, the main body of the suspended mud-water separation device is made of 304 stainless steel and has an overall cylindrical vertical structure. Stainless steel splicing flanges are set on the outside of each functional module, and the flanges and rubber sealing gaskets are spliced ​​into a whole.

[0028] Specifically, the sludge-water separation zone 4 is the core functional area of ​​the suspended sludge-water separation device for achieving deep sludge-water separation. It is connected to the effluent end of the sludge settling separation zone 3. Its horizontal cross-section is consistent with that of the sludge settling separation zone 3, and its vertical height is 30%-40% of the total height of the entire device. The outer side is a stainless steel perforated protective plate integrated with the device body, and the inner side is a layered separation unit. The layered separation unit adopts a composite structure of double-layer packing and microfiltration components. The lower layer is a coarse separation packing layer with a thickness of 200mm-300mm, and the upper layer is a fine separation microfiltration component layer with a thickness of 150mm-200mm. A stainless steel mesh with a pore size of 2mm-3mm is set between the two layers to achieve graded interception and separation.

[0029] The coarse separation packing layer can use modified ceramsite packing with a particle size of 3mm-5mm and a packing porosity of 60%-70%. The packing surface is coated with a hydrophilic coating, such as a polyethylene glycol coating, to prevent sludge particles from adsorbing and clumping. The fine separation microfiltration module layer uses polypropylene hollow fiber microfiltration membrane modules with an inner diameter of 0.8mm-1.0mm, an outer diameter of 1.2mm-1.5mm, and a pore size of 0.1μm-0.2μm. The membrane modules are arranged in a curtain-like pattern with a density of 80 modules / m². 2 -100 roots / m 2 The membrane module is encapsulated in stainless steel slots with epoxy resin at both ends for easy disassembly and replacement.

[0030] The design flow velocity of the empty tower in the sludge-water separation zone 4 is 0.5 m / h-0.8 m / h, and the residence time of the water in the sludge-water separation zone 4 is 15 min-20 min, ensuring sufficient contact between fine suspended solids and colloidal particles and the separation material. Simultaneously, the suspended sludge-water separation device is also equipped with a backwashing structure located at the top of the sludge-water separation zone 4, featuring a backwash pipe connected to an external high-pressure clean water pipe. The backwashing pressure is 0.15 MPa-0.2 MPa, the backwashing frequency is 24 hours / time, and the single backwashing time is 5 min-8 min, preventing clogging of the separation material and microfiltration membrane module.

[0031] Specifically, the aerobic tank inlet pipe 2 is made of 304 stainless steel, and a stainless steel filter screen with a pore size of 3mm-5mm is installed on the inside of the inlet to intercept large particles of debris in the sewage.

[0032] Specifically, the sludge settling and separation zone 3 is a cylindrical cavity structure with a vertical height of 25%-30% of the total height of the suspended sludge-water separation device. The bottom is a conical structure, and the conical bottom is connected to the sludge escape channel 6.

[0033] Specifically, the degree of granulation is a weighted sum of the suspended solids concentration coefficient, the median particle size coefficient, and the colloidal particle proportion coefficient, wherein the weighting coefficient of the suspended solids concentration coefficient is 0.35, the weighting coefficient of the median particle size coefficient is 0.15, and the weighting coefficient of the colloidal particle proportion coefficient is 0.5.

[0034] Specifically, the suspended solids concentration coefficient is determined based on the ratio of the suspended solids concentration at the effluent end of the mud-water separation zone 4 to the suspended solids concentration at the influent end. The detection point at the influent end is the junction of the mud-water separation zone 4 and the sludge settling separation zone 3, and the detection point at the effluent end is the side of the mud-water separation zone 4 near the clear water effluent weir 5. Real-time detection data at both ends are collected simultaneously, and the concentration ratio of suspended solids at the effluent end to that at the influent end is calculated. If the concentration ratio is less than or equal to the first preset ratio of 0.2, then the suspended solids concentration coefficient is 0.2. If the concentration ratio is greater than the first preset ratio of 0.2 and less than or equal to the second preset ratio of 0.5, then the suspended solids concentration coefficient is 0.8. If the concentration ratio is greater than the second preset ratio of 0.5 and less than or equal to the third preset ratio of 0.8, then the suspended solids concentration coefficient is 1.5. If the concentration ratio is greater than the third preset ratio of 0.8, then the suspended solids concentration coefficient is 2.2.

[0035] Specifically, the median particle size coefficient is determined based on the ratio of the median particle size at the effluent end to the median particle size at the influent end of the mud-water separation zone 4. The detection point is consistent with the suspended solids concentration detection point, and real-time detection data at both ends are collected synchronously and the particle size ratio at the effluent end to the influent end is calculated. If the particle size ratio is less than or equal to the first preset ratio of 0.1, the median particle size coefficient is 0.3. If the particle size ratio is greater than the first preset ratio of 0.1 and less than or equal to the second preset ratio of 0.4, then the median particle size coefficient is 0.9. If the particle size ratio is greater than the second preset ratio of 0.4 and less than or equal to the third preset ratio of 0.7, then the median particle size coefficient is 1.6. If the particle size ratio is greater than the third preset ratio of 0.7, then the median particle size coefficient is 2.3.

[0036] Specifically, the colloidal particle proportion coefficient is determined based on the ratio of the colloidal particle proportion at the outlet end of the mud-water separation zone 4 to the colloidal particle proportion at the inlet end. The colloidal particle proportion is the percentage of the mass of colloidal particles to the total mass of suspended particles. The detection point is consistent with the suspended solids concentration detection point. Real-time detection data from both ends are collected synchronously, and the proportion ratio between the outlet end and the inlet end is calculated. If the proportion ratio is less than or equal to the first preset ratio of 0.3, the colloidal particle proportion coefficient is 0.4. If the ratio is greater than the first preset ratio of 0.3 and less than or equal to the second preset ratio of 0.6, then the colloidal particle ratio coefficient is 0.7. If the ratio is greater than the second preset ratio of 0.6, then the colloidal particle ratio coefficient is 1.4.

[0037] Specifically, the concentration of suspended solids can be obtained using an infrared scattering light immersion sensor, and the colloidal particles and particle size can be obtained using a laser particle size distribution sensor; no specific model is limited.

[0038] Specifically, the operation process determination module determines that the operation stability of the suspended mud-water separation device is unqualified based on the comparison result that the particle size index is greater than the preset particle size index. The operation process determination module determines that the operation stability of the suspended mud-water separation device is qualified based on the comparison result that the particle size index is less than or equal to the preset particle size index.

[0039] Specifically, the preset particle size index is 0.8, but the above value is not limited to this, and those skilled in the art can choose a value according to actual needs.

[0040] Specifically, the suspended solids concentration reflects the total interception effect of the separation zone on suspended particles, directly related to the suspended solids content of the effluent. The median particle size reflects the graded interception effect of the separation zone on particles of different sizes, demonstrating the separation zone's ability to retain fine particles. The proportion of colloidal particles reflects the interception effect of the separation zone on the most difficult-to-treat colloidal particles, serving as an indicator for measuring deep separation efficiency. Based on the integration of three key parameters strongly correlated with deep sludge-water separation, the particle size distribution index can accurately quantify the actual efficiency of the core sludge-water separation zone 4 of the device from multiple dimensions. The sludge-water separation zone 4 is the core functional area for achieving deep sludge-water separation in the suspended sludge-water separation device, and the operating status of the device directly determines the overall working effect. The value of the particle size distribution index directly corresponds to the actual separation efficiency of the separation zone. If the separation efficiency meets the standard, the index is within a reasonable range, indicating that the core functional area is operating normally. If the separation efficiency declines, the index rises abnormally, indicating that there is an operational problem in the core functional area. The stability of the core functional area is a prerequisite for the overall stable operation of the device. This index can directly capture the most critical operating status of the device, determining the operational stability of the device from its root cause.

[0041] Specifically, under the condition that the operation stability of the suspended sludge-water separation device is unqualified, the floc quality judgment module determines that the sludge floc quality is unqualified based on the comparison result that the absolute value of the Zeta potential is greater than the first preset potential or less than the second preset potential. The floc quality determination module determines that the sludge flocs are of qualified quality based on the comparison result that the absolute value of the Zeta potential is less than or equal to the first preset potential and greater than or equal to the second preset potential.

[0042] Specifically, the first preset potential is 30mV and the second preset potential is 20mV, but the above values ​​are not limited to these, and those skilled in the art can choose the values ​​according to actual needs.

[0043] Specifically, the Zeta potential is essentially the electrokinetic potential on the surface of sludge flocs. In wastewater treatment, sludge flocs are mostly negatively charged, and the magnitude of this potential determines the electrostatic repulsion between floc particles. If the absolute value of the potential is too high, the repulsion is too strong, and the floc particles cannot attract and aggregate, remaining in a dispersed and fine state, making settling difficult. If the absolute value of the potential is too low, the repulsion is too weak, and although the flocs can aggregate, their structure is loose, easily broken by water flow and aeration, and they lose their settling ability. Only when the flocs are densely aggregated and settle quickly can they be rapidly intercepted in the separation zone. The threshold range of the Zeta potential is the critical state where the sludge flocs achieve optimal aggregation and settling properties. The value within this range directly characterizes whether the flocs possess the quality required for the separation zone. Poor sludge floc quality leads to a decrease in the efficiency of the separation zone, resulting in substandard operational stability of the equipment.

[0044] Specifically, the zeta potential is collected using a dedicated immersion online zeta potential analyzer for wastewater treatment; the specific model is not limited.

[0045] Specifically, under the condition that the sludge flocs are of qualified quality, the floc quality determination module sets several opening adjustment coefficients to optimize the stripping opening of the stripping control valve 8 based on the area ratio of the effective water passage area to the preset water passage area and the comparison result of the preset area ratio.

[0046] Specifically, the floc quality determination module does not optimize the stripping opening of the stripping control valve 8 based on the comparison result that the area ratio is greater than or equal to the first preset area ratio; The floc quality determination module determines, based on the comparison result that the area ratio is less than the first preset area ratio and greater than or equal to the second preset area ratio, to increase the stripping opening of the stripping control valve 8 by a stripping opening adjustment coefficient of 1.2. Based on the comparison result that the area ratio is less than the second preset area ratio, the floc quality determination module determines to increase the stripping opening of the stripping control valve 8 by a second opening adjustment coefficient of 1.5.

[0047] Specifically, the first preset area ratio is 0.7 and the second preset area ratio is 0.5, but the above values ​​are not limited to these, and those skilled in the art can choose values ​​according to actual needs.

[0048] Specifically, the stripping opening of the stripping control valve 8 is the design opening of the stripping control valve 8 under rated operating conditions when the sludge flocs are of acceptable quality, and the value range is 0-60%, with 50% being preferred in this embodiment of the invention.

[0049] Specifically, the method of optimizing the stripping opening using the opening adjustment coefficient is to multiply the selected opening adjustment coefficient by the design opening as the optimized stripping opening.

[0050] Specifically, the effective water flow area is the ratio of the real-time flow rate of the mud-water separation zone 4 to the design water flow velocity in the empty tower. The real-time flow rate of the mud-water separation zone 4 is determined based on the real-time data collected by the flow sensor installed on the inlet pipe 2 of the aerobic tank.

[0051] Specifically, under the condition that the stability of the device operation is not up to standard but the quality of the sludge flocs is up to standard, the failure of sludge-water separation is not caused by the sludge's own aggregation or poor settling performance, but by the fact that the high-efficiency sludge-water separation zone 4 has sludge deposition at the bottom and sludge adhesion on the surface of the separation material due to the untimely sludge return, which causes the effective water flow area to be squeezed and the water flow state to be disordered. The stripping control valve 8 directly controls the sludge return discharge rate and speed, and adjusts its opening by quantitatively changing the effective water flow area gradient, which can quickly remove the deposited sludge and restore the normal water flow space of the separation zone, thus solving the problem of unstable operation from the root.

[0052] Specifically, the sludge quality determination module determines that the sludge treatment capacity is qualified based on the comparison result that the oxygen consumption rate of the sludge is greater than or equal to a preset rate when the sludge floc quality is unqualified. The sludge quality assessment module determines that the sludge treatment capacity is unqualified based on the comparison result that the oxygen consumption rate of the sludge is less than the preset rate.

[0053] Specifically, the preset rate is 15 mg O2 / (L·h), but the above value is not limited to this, and those skilled in the art can choose the value according to actual needs.

[0054] Specifically, the oxygen consumption rate of the sludge in the sludge-water separation zone 4 is determined based on data collected by a dissolved oxygen sensor located at the bottom of the sludge-water separation zone 4, and is the amount of decrease in dissolved oxygen concentration per unit volume of sludge mixture per unit time.

[0055] Specifically, the essence of sludge treatment of wastewater lies in the biochemical degradation capacity of microorganisms in activated sludge against pollutants. Microbial degradation of organic matter requires aerobic respiration, and the oxygen consumption rate directly reflects the respiration intensity and metabolic activity of microorganisms, showing a strong positive correlation. Therefore, the oxygen consumption rate can be used to determine whether the sludge treatment capacity is up to standard. A higher oxygen consumption rate indicates more vigorous microbial metabolism and a stronger ability to degrade pollutants, indicating that the sludge treatment capacity is up to standard. Conversely, a lower oxygen consumption rate indicates that the microorganisms are aging, poisoned, or experiencing activity decline, resulting in a significant decrease in their pollutant degradation capacity, indicating that the sludge treatment capacity is unqualified.

[0056] Specifically, when the sludge quality judgment module is not up to standard in terms of sludge treatment capacity, it sets several opening correction coefficients based on the relative difference between the preset oxygen consumption rate and the oxygen consumption rate to adjust the stripping opening.

[0057] Specifically, the sludge quality determination module determines to increase the stripping opening by using a stripping opening correction coefficient based on the comparison result where the relative difference is greater than or equal to a preset relative difference. Based on the comparison result that the relative difference is less than the preset relative difference, the sludge quality determination module determines to increase the stripping opening by a second opening correction coefficient.

[0058] Specifically, the relative difference between the preset oxygen consumption rate and the oxygen consumption rate is the difference between the preset oxygen consumption rate and the oxygen consumption rate, expressed as a percentage of the preset oxygen consumption rate.

[0059] Specifically, the preset relative difference is 20%, the stripping opening correction coefficient is 1.6, and the second opening correction coefficient is 1.3. However, the above values ​​are not limited to these, and those skilled in the art can also choose values ​​according to actual needs.

[0060] Specifically, when the sludge treatment capacity of the sludge-water separation zone 4 is not up to standard, the stripping opening of the stripping control valve 8 can be increased to quickly return the aged and deactivated sedimented sludge at the bottom of the sludge-water separation zone 4 to the main reaction zone of the aerobic tank 1, so as to avoid the accumulation of dead sludge and deterioration of flocs; at the same time, fresh activated sludge from the aerobic tank 1 can be circulated to the separation zone to replace the ineffective sludge, thereby simultaneously improving the oxygen consumption rate and floc quality.

[0061] Specifically, the method of increasing the stripping opening of the stripping control valve 8 by using the opening correction coefficient is to determine the increased stripping opening by multiplying the selected opening correction coefficient by the design opening.

[0062] Specifically, the sludge reduction determination module determines that the sludge reduction effect is qualified based on the comparison result that the sludge yield coefficient is less than or equal to the preset yield coefficient, provided that the sludge treatment capacity is qualified. The sludge reduction determination module determines that the sludge reduction effect is unqualified based on the comparison result that the sludge yield coefficient is greater than the preset yield coefficient.

[0063] Specifically, the preset yield coefficient is 0.7 kg MLSS / kg COD, but the above value is not limited to this, and those skilled in the art can also choose a value according to actual needs.

[0064] Specifically, qualified sludge treatment capacity only means that activated sludge has normal pollutant degradation capacity. However, if microorganisms proliferate excessively and the system produces too much sludge, a large amount of sludge will accumulate at the bottom of the sludge-water separation zone 4, clogging the separation packing / membrane components, squeezing the effective water flow area, and ultimately causing short circuits in the device's water flow, reduced separation efficiency, and unqualified operational stability.

[0065] Specifically, the sludge yield coefficient is the ratio of the total mass of sludge added to aerobic tank 1 per unit time to the total mass of pollutants removed by aerobic tank 1 per unit time. The total mass of sludge added to aerobic tank 1 per unit time is the product of the change in sludge concentration per unit time and the volume of aerobic tank 1. The total mass of pollutants removed by aerobic tank 1 per unit time is the product of the difference between the influent chemical oxygen demand (COD) concentration and the effluent COD concentration of aerobic tank 1 and the influent flow rate of aerobic tank 1 per unit time.

[0066] Specifically, the influent and effluent chemical oxygen demand (COD) concentrations of aerobic tank 1 are determined based on real-time data collected by COD sensors installed at the influent and effluent ends of aerobic tank 1. The influent flow rate of aerobic tank 1 is determined based on real-time data collected by a flow sensor installed at the influent pipe of aerobic tank 1. The change in sludge concentration is determined by real-time data collected by a sludge concentration sensor installed in aerobic tank 1. The specific model of the sensor is not limited.

[0067] Specifically, when the sludge reduction effect is unqualified, the sludge reduction judgment module optimizes the preset granulation index by setting several index adjustment coefficients based on the comparison result of the relative difference between the sludge yield coefficient and the preset yield coefficient and the relative difference between the preset yield coefficient and the preset yield coefficient.

[0068] Specifically, the sludge reduction determination module determines to optimize the preset granulation index with a first index adjustment coefficient based on the comparison result that the relative difference of yield is greater than or equal to the preset relative difference of yield. The sludge reduction determination module determines to optimize the preset granulation index with a second index adjustment coefficient based on the comparison result that the relative difference in yield is less than the preset relative difference in yield.

[0069] Specifically, the preset yield difference is set at 15%, the first index adjustment coefficient is set at 1.12, and the second index adjustment coefficient is set at 1.08. However, the above values ​​are not limited to these, and those skilled in the art can also choose values ​​according to actual needs.

[0070] Specifically, the relative yield difference is the difference between the sludge yield coefficient and the preset yield coefficient, expressed as a percentage of the preset yield coefficient.

[0071] Specifically, a failure to meet sludge reduction standards indicates excessive sludge production in aerobic tank 1. This leads to a sharp increase in sludge concentration, severe sludge accumulation, and a significant increase in separation load within sludge-water separation zone 4, constituting a severe operating condition. Under such high-sludge production conditions, the large volume and turbulent flow of sludge in sludge-water separation zone 4 prevent the sludge from achieving the high particle size characteristic of normal operation, resulting in a naturally low particle size index. If the original high preset particle size index is still used as the benchmark, the deteriorating operating conditions leading to low particle size may be misinterpreted as separation failure or operational instability, triggering incorrect control commands such as blindly increasing the stripping opening or excessive disturbance. This can exacerbate blockages and disturbances, undermining true operational stability. Therefore, increasing the preset particle size index and proactively lowering the stability threshold allows the benchmark to match the current severe high-sludge production conditions, avoiding the use of high standards for normal operation to judge the state of the device under severe conditions.

[0072] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles 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 all fall within the scope of protection of the present invention.

Claims

1. A suspended sludge-water separation device for wastewater treatment, characterized in that, include: The aerobic tank inlet pipe, sludge settling and separation zone, mud-water separation zone and clear water outlet weir are arranged sequentially from bottom to top. The mud-water separation zone is connected to the sludge escape channel, the sludge escape channel is connected to the inlet end of the stripping pipe, and the stripping pipe is equipped with a stripping control valve. The data acquisition module includes a laser particle size distribution sensor for acquiring particle distribution characteristics in wastewater, a flow sensor for acquiring real-time flow rate, and a dissolved oxygen sensor for determining the oxygen consumption rate of sludge in the sludge-water separation zone. The operation process determination module is used to determine whether the operation stability of the suspended sludge-water separation device is qualified based on the comparison result of the particle size index of the sewage in the sludge-water separation zone and the preset particle size index. The floc quality determination module responds to operational instability issues by determining whether the sludge floc quality is acceptable based on the Zeta potential of the sludge flocs in the sludge-water separation zone, and optimizes the stripping opening of the stripping control valve based on the effective water flow area of ​​the sludge-water separation zone under acceptable conditions. The sludge quality assessment module, in response to the sludge flocs failing to meet quality standards, determines whether the sludge treatment capacity is up to standard based on the oxygen consumption rate of the sludge in the sludge-water separation zone. The sludge reduction determination module is used to determine whether the sludge reduction effect is qualified based on the sludge yield coefficient of the aerobic tank, and to optimize the preset granulation index based on the condition that the sludge reduction effect is unqualified.

2. The suspended sludge-water separation device for wastewater treatment according to claim 1, characterized in that, The degree of granulation is a weighted sum of the suspended solids concentration coefficient, the median particle size coefficient, and the proportion coefficient of colloidal particles.

3. The suspended sludge-water separation device for wastewater treatment according to claim 2, characterized in that, The operation process determination module determines that the operation stability of the suspended mud-water separation device is unqualified based on the comparison result that the particle size index is greater than the preset particle size index.

4. The suspended sludge-water separation device for wastewater treatment according to claim 3, characterized in that, The floc quality determination module determines that the sludge floc quality is unqualified based on the comparison result that the absolute value of the Zeta potential is greater than the first preset potential or less than the second preset potential when the operation stability of the suspended sludge-water separation device is unqualified.

5. The suspended sludge-water separation device for wastewater treatment according to claim 3, characterized in that, The floc quality determination module determines that the sludge flocs are of qualified quality when the operation stability of the suspended sludge-water separation device is unqualified, based on the comparison result that the absolute value of the Zeta potential is less than or equal to the first preset potential and greater than or equal to the second preset potential.

6. The suspended sludge-water separation device for wastewater treatment according to claim 5, characterized in that, Under the condition that the sludge flocs are of qualified quality, the floc quality determination module sets several opening adjustment coefficients based on the area ratio of the effective water passage area to the preset water passage area and the comparison result of the preset area ratio to optimize the stripping opening of the stripping control valve.

7. The suspended sludge-water separation device for wastewater treatment according to claim 4, characterized in that, The sludge quality assessment module determines that the sludge treatment capacity is qualified based on the comparison result that the oxygen consumption rate of the sludge is greater than or equal to a preset rate when the sludge floc quality is unqualified.

8. The suspended sludge-water separation device for wastewater treatment according to claim 4, characterized in that, The sludge quality determination module determines that the sludge treatment capacity is unqualified based on the comparison result that the oxygen consumption rate of the sludge is less than the preset rate when the sludge floc quality is unqualified. The sludge quality determination module sets several opening correction coefficients based on the relative difference between the preset oxygen consumption rate and the oxygen consumption rate to adjust the stripping opening.

9. The suspended sludge-water separation device for wastewater treatment according to claim 7, characterized in that, Under the condition that the sludge treatment capacity is qualified, the sludge reduction judgment module determines that the sludge reduction effect is unqualified based on the comparison result that the sludge yield coefficient is greater than the preset yield coefficient.

10. The suspended sludge-water separation device for wastewater treatment according to claim 9, characterized in that, When the sludge reduction effect is unqualified, the sludge reduction judgment module sets several index adjustment coefficients to increase the preset granulation index based on the comparison result of the relative difference between the sludge yield coefficient and the preset yield coefficient and the relative difference between the preset yield coefficients.

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