Intermittent Aeration SBR-Based Sewage Treatment System

Abstract

The present invention relates to an intermittent aeration SBR-based wastewater treatment system comprising an inflow tank (10), an equalization tank (20), an SBR reaction tank (30), an aeration section (40), a treatment tank (50), a stirrer (100), and an artificial intelligence control section (300). The stirrer (100) comprises a rotating shaft (110), a plurality of blades (120), an angle adjustment section (130), a first blade (124), and a second blade (126), and is configured such that the inclination angle of the blades (120) is variable, thereby improving the uniformity of mixing inside the reaction tank and reducing the variation in the concentration of the mixed liquid and the occurrence of stagnant areas. In addition, the artificial intelligence control section (300) is configured to stably perform nitrification and denitrification reactions by controlling the aeration time, non-aeration time, the rotation speed of the stirrer, and the blade inclination angle based on dissolved oxygen (DO), oxidation-reduction potential (ORP), MLSS concentration, and mixing state. Accordingly, the present invention can reduce energy consumption while ensuring stable treatment efficiency and sedimentation stability even under various inflow load conditions.

Description

Technology Field

[0001] The present invention relates to the field of wastewater treatment technology, and more specifically, to a small-scale wastewater treatment system based on an intermittent aeration SBR (Sequencing Batch Reactor) for treating domestic sewage, wastewater generated in rural and island areas, wastewater from small-scale industrial sites, or distributed domestic wastewater.

[0002] In particular, the present invention relates to a small-scale wastewater treatment system based on intermittent aeration SBR that can improve the mixing uniformity and sedimentation stability of the mixed liquid and reduce local dissolved oxygen and sludge concentration variations that may occur during intermittent aeration operation by providing a stirrer with a variable blade angle inside the reaction tank in an SBR process that sequentially performs inflow, reaction, sedimentation, and discharge processes within a single reaction tank.

[0003] In addition, the present invention relates to a small-scale wastewater treatment system based on intermittent aeration SBR that can maintain stable biological treatment efficiency under various operating conditions by analyzing the wastewater inflow load, mixed liquid concentration, dissolved oxygen (DO) concentration, oxidation-reduction potential (ORP), sludge settling characteristics, and the mixing state inside the reactor in real time, and controlling the rotation speed of the agitator, the blade inclination angle, and the intermittent aeration cycle based on artificial intelligence accordingly. Background Technology

[0004] Generally, biological treatment processes used to treat domestic sewage and wastewater include activated sludge processes, Sequencing Batch Reactors (SBRs), catalytic oxidation processes, and membrane separation processes. Among these, the SBR process has the advantage of not requiring separate sedimentation tanks or return sludge facilities, as it can sequentially perform fill, react, settle, draw, and idle processes within a single reactor.

[0005] In particular, the SBR process utilizing intermittent aeration allows for the performance of both nitrification and denitrification reactions within the same reactor by repeatedly switching between aerated and non-aerated states. This offers the advantage of improving nitrogen removal efficiency while reducing energy consumption. Furthermore, the intermittent aeration method is recognized as a suitable process for wastewater treatment facilities because it can lower operating costs by reducing blower operating time.

[0006] However, conventional intermittent aeration SBR systems had a problem in that the distribution of dissolved oxygen (DO) inside the reactor became uneven and localized uneven mixing zones were formed during the process of repeatedly switching between aeration and non-aeration states. In particular, while excessive mixing occurred in some areas due to the inflow of air during aeration, the mixing force was insufficient during non-aeration, which could result in uneven sludge settling, localized dead zones, and variations in sludge concentration.

[0007] In addition, most conventional agitators consist of a simple rotating structure with a fixed blade angle, which has limitations in actively responding to changes in the concentration of influent wastewater, changes in sludge concentration, changes in the flow state inside the reactor, and changes in intermittent aeration operating conditions. Consequently, under certain operating conditions, there were problems such as reduced sedimentation stability due to excessive mixing, or conversely, uneven sludge settling and reduced treatment efficiency due to insufficient mixing.

[0008] In particular, for relatively small-scale wastewater treatment systems, fluctuations in inflow rate and pollution load are significant, and wastewater characteristics can change rapidly depending on the season or time of day; therefore, it is crucial to stably maintain the mixing state inside the reactor according to operating conditions. However, conventional intermittent aeration SBR systems often control aeration rate or stirring speed using simple fixed values, which has presented a problem in that it is difficult to maintain an appropriate mixing state in response to changes in actual operating conditions.

[0009] In addition, conventional technology lacked the technology to actively control the operating conditions of the intermittent aeration cycle and the agitator by comprehensively analyzing the mixing state inside the reactor, sludge settling characteristics, changes in DO concentration, and changes in ORP. Consequently, problems such as increased energy consumption, reduced settling stability, and decreased treatment efficiency continued to occur.

[0011] [Prior Art Literature]

[0012] [Patent Literature]

[0013] Korean Patent Publication No. 10-2025-0174803 (December 15, 2025) The problem to be solved

[0014] The objective of the present invention is to provide an intermittent aeration SBR-based wastewater treatment system capable of maintaining a stable mixing state according to changes in operating conditions within an SBR reactor to which an intermittent aeration method is applied.

[0015] In addition, the objective of the present invention is to provide an intermittent aeration SBR-based wastewater treatment system that can improve the uniformity of mixing inside the reactor and reduce sludge concentration variation and local dead zones by including a stirrer in which the angle of inclination of the blade can be adjusted in response to changes in the wastewater inflow rate, organic load, mixed liquid concentration, and intermittent aeration operating conditions.

[0016] Furthermore, the objective of the present invention is to provide an intermittent aeration SBR-based wastewater treatment system capable of maintaining a stable mixing state and sedimentation stability even under operating conditions where aeration and non-aeration states are repeated, by applying a blade structure capable of folding and returning according to changes in fluid resistance.

[0017] In addition, the objective of the present invention is to provide an intermittent aeration SBR-based wastewater treatment system capable of maintaining stable biological treatment efficiency under various operating conditions by analyzing the dissolved oxygen (DO) concentration, oxidation-reduction potential (ORP), mixed liquid concentration, sludge settling characteristics, and mixing state inside the reactor in real time, and controlling the rotation speed of the agitator, the blade inclination angle, and the intermittent aeration cycle based on artificial intelligence accordingly.

[0018] Furthermore, the objective of the present invention is to provide an intermittent aeration SBR-based wastewater treatment system that reduces unnecessary energy consumption by actively adjusting the aeration time, non-aeration time, and sedimentation time according to operating conditions, and enables stable performance of nitrification and denitrification reactions.

[0019] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0020] The technical problem of the present invention as described above is achieved by the following means.

[0021] (1) In an intermittent aeration SBR-based wastewater treatment system,

[0022] Inflow tank (10) into which domestic wastewater or industrial wastewater flows;

[0023] An equalization tank (20) that stores wastewater passing through an inflow tank (10) and mitigates fluctuations in flow rate and water quality;

[0024] An SBR reactor (30) equipped with an internal stirrer (100) and sequentially performing inflow, reaction, sedimentation, and discharge processes for wastewater introduced from an equalization tank (20);

[0025] An aeration unit (40) that supplies air to the above SBR reactor (30);

[0026] A treated water tank (50) for storing treated water discharged during the discharge stage of the above SBR reactor (30); and

[0027] It includes an artificial intelligence control unit (300) that controls the operating state of the agitator (100) according to changes in the characteristics of the wastewater, and

[0028] The above stirrer (100) is,

[0029] A rotating shaft (110) that transmits rotational force;

[0030] A plurality of blades (120) coupled to the above-mentioned rotating shaft (110) to form a fluid flow; and

[0031] It includes a rotation drive unit (140) that rotates the above rotation shaft (110), and

[0032] The blade (120) has a blade shaft (122) as its central axis, and the blade shaft (122) is installed to be rotatable about the rotation axis (110).

[0033] The above-mentioned stirrer (100) includes an angle adjustment unit (130) that rotates the blade shaft (122) to adjust the inclination angle of the blade (120), and

[0034] The above angle adjustment unit (130) is,

[0035] An operating space (131) formed inside the above-mentioned rotating shaft (110);

[0036] An operating shaft (132) installed to be movable along the above operating space (131);

[0037] A control drive unit (133) that moves the above operating shaft (132) in the longitudinal direction of the operating space;

[0038] A driven gear (134) installed at the end of the blade shaft (122) of the blade (120);

[0039] A drive block (135) coupled to the above-mentioned operating shaft (132) and moved together with it;

[0040] and a rack gear (136) formed in the drive block (135) to mesh with the driven gear (134);

[0041] Includes,

[0042] The above blade (120) is,

[0043] A first blade (124) and a second blade (126) are arranged on both sides based on the blade shaft (122) and formed to be foldable;

[0044] and a blade original position part (128) that returns the folded first blade (124) and second blade (126) to an unfolded state;

[0045] Includes,

[0046] An intermittent aeration SBR-based wastewater treatment system characterized in that the first blade (124) and the second blade (126) are each composed of a first blade piece (125) and a second blade piece (127) that are segmented into multiple parts and formed to be individually foldable.

[0047] (2) In the above (1), the artificial intelligence control unit (300) is,

[0048] A properties sensing unit (310) that collects sensing information from sensors installed in the inflow tank (10), equalization tank (20), SBR reaction tank (30), aeration unit (40), and treatment tank (50);

[0049] A process state judgment unit (320) that determines the process state of the current SBR operation stage based on data collected from the above-mentioned shape sensing unit (310);

[0050] A load prediction unit (330) that predicts the inflow load in a subsequent cycle based on past and present data collected from the equalization tank (20) and the SBR reactor (30);

[0051] A stirring condition calculation unit (340) that calculates the rotational speed of the stirrer (100) and the inclination angle of the blade (120) based on information collected from a sensor installed in the SBR reactor (30);

[0052] A mixing non-uniformity prediction unit (350) that predicts the possibility of mixing non-uniformity based on information collected from a sensor installed in an SBR reactor (30);

[0053] A cycle control unit (360) that controls the time of the inflow stage, reaction stage, sedimentation stage and discharge stage of the SBR reactor (30);

[0054] A control signal output unit (370) that outputs the control value calculated by the above stirring condition calculation unit (340) and cycle control unit (360);

[0055] and an operation data learning unit (380) that updates the operation conditions and process control values ​​of the stirrer (100) by storing and learning information collected from the above-mentioned shape sensing unit (310), the judgment result from the process state judgment unit (320), the calculated value from the stirring condition calculation unit (340), the prediction result from the mixing non-uniformity prediction unit (350), and the control result from the cycle control unit (360);

[0056] An intermittent aeration SBR-based wastewater treatment system characterized by including

[0057] (3) In the above (1),

[0058] The above rotational shaft (110) is composed of a plurality of unit shafts (111) interconnected in series, and

[0059] The above operating shaft (132) is formed by connecting a plurality of unit shafts (132a) in series, and

[0060] The above blade original positioning part (128) includes a torsion spring, and one end of the torsion spring is fixed to the blade shaft (122), and the other end is fixed to the first blade (124) or the second blade (126), characterized by an intermittent aeration SBR-based wastewater treatment system. Effects of the invention

[0062] According to the present invention, by applying a stirrer with an adjustable blade angle to the inside of an SBR reactor, the mixing state inside the reactor can be stably maintained even under operating conditions where aeration and non-aeration states are repeated, thereby improving the uniformity of mixing and reducing variations in sludge concentration and the occurrence of local stagnation zones.

[0063] In addition, according to the present invention, by including a structure in which the first blade and the second blade fold and return according to changes in fluid resistance, it is possible to maintain a stable mixing state in response to changes in wastewater inflow load, changes in the concentration of the mixed liquid, and changes in intermittent aeration operating conditions. In particular, while securing sufficient mixing force in the aeration state, it is possible to suppress excessive stirring in the non-aeration state and the sedimentation stage, thereby improving the stability of sludge sedimentation.

[0064] In addition, according to the present invention, since a plurality of first blade pieces and second blade pieces can each be individually folded and returned, the mixing state can be actively changed according to changes in fluid resistance inside the reaction vessel, thereby having the effect of forming a stable mixed flow even under various operating conditions.

[0065] In addition, according to the present invention, the dissolved oxygen (DO) concentration, oxidation-reduction potential (ORP), mixed liquid concentration, and sludge settling characteristics inside the reaction tank are analyzed in real time, and accordingly, the rotation speed of the agitator, the blade inclination angle, and the intermittent aeration cycle are controlled based on artificial intelligence, thereby enabling stable nitrification and denitrification reactions and reducing fluctuations in treatment efficiency.

[0066] In addition, according to the present invention, since the aeration time, non-aeration time, and sedimentation time can be actively adjusted according to operating conditions, energy consumption can be reduced by decreasing unnecessary blower operation, and stable treatment performance can be secured even in distributed wastewater treatment facilities. Brief explanation of the drawing

[0067] Figure 1 is an overall configuration diagram of an intermittent aeration SBR-based wastewater treatment system according to the present invention. Figure 2 is an overall configuration diagram of a stirrer according to an embodiment of the present invention. FIG. 3 is a detailed structural diagram of a blade and a blade shaft according to an embodiment of the present invention. FIG. 4 is a structural diagram of a rotation axis and an angle adjustment unit according to an embodiment of the present invention. FIG. 5 is an operating state diagram of a foldable blade according to an embodiment of the present invention. FIG. 6 is a structural diagram of a foldable blade and blade piece according to an embodiment of the present invention. Specific details for implementing the invention

[0068] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0069] Throughout the specification, when a part is described as "comprising" or "including" a component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, the term "...part" as used in the specification refers to a unit that performs at least one function or operation. Additionally, "one (a or an)," "one," "the," and similar related terms may be used in the context describing the invention (particularly in the context of the following claims) to include both singular and plural forms, unless otherwise indicated in the specification or clearly contradicted by the context.

[0070] In describing the embodiments of the present invention, specific descriptions of known functions or configurations will be omitted if it is determined that such detailed descriptions could unnecessarily obscure the essence of the invention. Furthermore, the terms described below are defined in consideration of their functions in the embodiments of the present invention, and these definitions may vary depending on the intentions or practices of the user or operator. Therefore, such definitions should be based on the content throughout this specification.

[0071] Figure 1 illustrates the overall configuration of an intermittent aeration SBR-based small-scale wastewater treatment system including a variable flow agitator according to one embodiment of the present invention.

[0072] The intermittent aeration SBR-based small-scale wastewater treatment system according to the present invention may be configured to include an inflow tank (10), an equalization tank (20), an SBR reaction tank (30), an aeration section (40), a treatment tank (50), and an artificial intelligence control section (300) in order to remove organic matter, nitrogen components, and suspended solids contained in domestic wastewater, wastewater from rural or island areas, wastewater from small-scale industrial sites, or dispersed domestic wastewater. In addition, a stirrer (100) for stirring the mixture may be installed inside the SBR reaction tank (30).

[0073] The above inlet tank (10) is configured to receive domestic wastewater or industrial wastewater first, and is configured to remove some of the debris, coarse solids, and suspended solids contained in the inlet wastewater and to mitigate instantaneous fluctuations in the inlet flow rate. The above inlet tank (10) may include a screen, a sedimentation tank, or a debris removal section, and the wastewater that has passed through the above inlet tank (10) is supplied to the equalization tank (20).

[0074] The wastewater flowing into the inflow tank (10) may have, for example, a COD (Chemical Oxygen Demand, hereinafter COD) of 100 to 800 mg / L, a BOD (Biochemical Oxygen Demand, hereinafter BOD) of 60 to 500 mg / L, a SS (Suspended Solids, hereinafter SS) of 80 to 600 mg / L, a total nitrogen (TN) of 20 to 100 mg / L, an ammonia nitrogen (NH₄-N) of 10 to 70 mg / L, and a total phosphorus (TP) of 2 to 15 mg / L. In addition, the pH of the inflow wastewater may be in the range of 6.0 to 8.5, and the inflow flow rate may vary in the range of 0.3 to 3.0 times the average flow rate over time. The inflow tank (10) may be configured to mitigate the direct transmission of such inflow fluctuations to the downstream equalization tank (20) and the SBR reactor (30).

[0075] The equalization tank (20) is configured to store wastewater that has passed through the inflow tank (10) for a certain period of time while mitigating fluctuations in flow rate and water quality. The equalization tank (20) may include a properties detection sensor (21) and a selective circulation mixing unit (22) inside. The properties detection sensor (21) can measure the COD, SS, turbidity, viscosity, pH, water temperature, and flow rate of the wastewater, and the measured values ​​can be transmitted to an artificial intelligence control unit (300) and used as preliminary input values ​​to calculate the reaction cycle of the SBR reactor (30), aeration conditions, and driving conditions of the stirrer (100).

[0076] The above-mentioned selective circulation mixing unit (22) can be configured to circulate a portion of the mixture inside the equalization tank (20) to mitigate local deviations in flow rate, COD, SS, viscosity, and turbidity, and to reduce the occurrence of non-uniformity in properties due to sedimentation or concentration.

[0077] To this end, the selective circulation mixing unit (22) may include a circulation pump, circulation piping, control valve, and a plurality of discharge nozzles for sucking the internal mixture of the equalization tank (20) and re-discharging it back into the equalization tank (20). The plurality of discharge nozzles may be arranged to face different heights or different directions of the equalization tank (20) to mitigate local deviations in COD, SS, viscosity, and turbidity of the influent wastewater and to reduce the occurrence of sedimentation or stagnation areas. Additionally, the selective circulation mixing unit (22) may be configured to be selectively driven or to have the circulation amount variably controlled when the change in viscosity, SS, turbidity, or flow rate measured by the characteristic detection sensor (21) is greater than or equal to a reference value, thereby mitigating load fluctuations of the downstream SBR reactor (30).

[0078] The equalization tank (20) can be operated under a hydraulic retention time (HRT) of 0.5 to 6 hours, and the selective circulation mixing unit (22) can be operated under low-speed stirring conditions in the range of 20 to 80 rpm. The wastewater in the equalization tank (20) may have characteristics in the range of COD 80 to 700 mg / L, BOD 50 to 450 mg / L, SS 50 to 500 mg / L, turbidity 50 to 400 NTU, and viscosity 1 to 15 mPa·s. Accordingly, abrupt changes in the inflow load are prevented from being directly transmitted to the SBR reactor (30), and the stability of intermittent aeration operation can be improved.

[0079] The above SBR reactor (30) is a core biological reactor that sequentially performs inflow, reaction, sedimentation, and discharge processes for wastewater introduced from the equalization tank (20). The above SBR reactor (30) can be configured to perform biological organic matter removal, nitrification, denitrification, sedimentation, and discharge of treated water in a time-divided manner within a single reactor. The above SBR reactor (30) can repeat the inflow stage, non-aeration mixing stage, aeration reaction stage, sedimentation stage, and discharge stage as a single operation cycle.

[0080] The mixture of the above SBR reactor (30) can be maintained in the range of MLSS (activated sludge suspended solids, hereinafter MLSS) 2,000 to 8,000 mg / L and MLVSS (activated sludge suspended volatile solids, hereinafter MLVSS) 1,200 to 5,500 mg / L, and the dissolved oxygen (DO) in the reaction stage can be maintained in the range of 1.0 to 4.0 mg / L when aerated and 0.5 mg / L or less when not aerated. In addition, the redox potential (ORP) can be maintained in the range of -50 to -250 mV during the non-aerated or denitrification stage, the pH can be maintained in the range of 6.5 to 8.5, and the water temperature can be maintained in the range of 10 to 35℃. One operation cycle of the above SBR reactor (30) can be set to a range of 4 to 12 hours, and, for example, may consist of an inflow stage of 0.5 to 2 hours, a reaction stage of 2 to 8 hours, a sedimentation stage of 0.5 to 2 hours, and a discharge stage of 0.2 to 1 hour.

[0081] An agitator (100) is installed inside the above SBR reactor (30), and the agitator (100) is configured to uniformly mix the mixture inside the reactor to reduce the variation in the concentration of the mixture and the occurrence of stagnation areas. In particular, the agitator (100) can be operated under different driving conditions during the aeration stage, the non-aeration mixing stage, and the stabilization stage before sedimentation, and the rotational speed and blade inclination angle can be variably controlled according to the viscosity of the wastewater, MLSS concentration, inflow load, and intermittent aeration cycle state.

[0082] The aeration unit (40) is a known configuration for supplying air to the SBR reactor (30) and may include a blower, an air supply pipe, and an air diffuser. The blower may be repeatedly operated and stopped according to the control of the artificial intelligence control unit (300), and the air diffuser may be positioned at the bottom or side of the SBR reactor (30) to supply air in the form of microbubbles. The aeration unit (40) may be operated in an intermittent aeration mode in which aeration time and non-aeration time are repeated, and accordingly, nitrification and denitrification reactions may be repeatedly performed within the same reactor.

[0083] The air supply amount of the aeration unit (40) can be set to a range of 0.2 to 2.0 m³ / min per 1 m³ of effective volume of the SBR reactor (30), and the aeration time can be repeated in a range of 10 to 90 minutes, and the non-aeration time in a range of 10 to 120 minutes. For example, the aeration time may be increased during high-load operation, and the non-aeration time may be increased when a denitrification reaction is required. In addition, if the DO concentration is lower than the target value, the airflow of the blower or the aeration time may be increased, and if the DO concentration is maintained above the target value, the operating time of the blower may be decreased.

[0084] The above-mentioned treatment tank (50) is configured to store treated water discharged during the discharge stage of the SBR reactor (30). The above-mentioned treatment tank (50) may be configured to discharge the treated water to the outside or supply it to a reuse process, and may further include a disinfection unit, a discharge pump, or a treated water quality sensor as needed. The treated water stored in the above-mentioned treatment tank (50) may have a water quality such as, for example, BOD 10 mg / L or less, COD 30 mg / L or less, SS 10 mg / L or less, total nitrogen (TN) 20 mg / L or less, total phosphorus (TP) 2.0 mg / L or less, and turbidity 5 NTU or less.

[0085] The artificial intelligence control unit (300) is configured to analyze changes in the characteristics of the incoming wastewater, the operating state of the SBR reactor (30), the operating state of the aeration unit (40), and the driving state of the agitator (100), and accordingly, to control the intermittent aeration cycle and the driving conditions of the agitator (100). Preferably, the artificial intelligence control unit (300) may include a characteristics sensing unit (310), a process state judgment unit (320), a load prediction unit (330), a stirring condition calculation unit (340), a mixing non-uniformity prediction unit (350), a cycle control unit (360), a control signal output unit (370), and an operation data learning unit (380).

[0086] The above-mentioned properties sensing unit (310) is configured to collect sensing information including water quality and operating status information of each treatment stage by being connected to sensors installed in the inflow tank (10), equalization tank (20), SBR reaction tank (30), aeration unit (40), and treatment tank (50). The above-mentioned properties sensing unit (310) can collect COD, BOD, SS, turbidity, viscosity, flow rate, pH, water temperature, ammoniacal nitrogen, nitrate nitrogen, total nitrogen, total phosphorus, dissolved oxygen, redox potential, MLSS, MLVSS, sludge interface height, and treated water turbidity in real time or periodically.

[0087] The process state judgment unit (320) is configured to determine the process state of the current SBR operation stage using data collected from the characteristics sensing unit (310). For example, the process state judgment unit (320) can determine the nitrification progress state by analyzing DO concentration and ammonia nitrogen concentration during the aeration stage, and determine the denitrification progress state by analyzing ORP (oxidation-reduction potential, hereinafter ORP) and nitrate nitrogen concentration during the non-aeration stage. In addition, during the sedimentation stage, it can determine sedimentation stability by analyzing sludge interface height, turbidity, and sedimentation velocity.

[0088] The load prediction unit (330) is configured to predict the inflow load in a subsequent cycle based on past and present data collected from the equalization tank (20) and the SBR reactor (30). The load prediction unit (330) can calculate the expected organic load, nitrogen load, and mixed liquid viscosity change in the next operating cycle using the time-dependent change patterns of the inflow rate, COD, BOD, SS, ammoniacal nitrogen, and viscosity. Accordingly, the load prediction unit (330) can provide the predicted value to the subsequent control unit so that the rotation speed of the stirrer (100), the blade inclination angle, and the aeration time are increased in advance when a high load inflow is expected.

[0089] The above stirring condition calculation unit (340) is configured to calculate the driving conditions of the stirrer (100) based on the mixing state, viscosity, MLSS concentration, DO concentration, ORP, and current operating stage of the SBR reactor (30). The above stirring condition calculation unit (340) can set the rotational speed of the stirrer (100) and the inclination angle of the blade (120) (or the amount of movement of the operating shaft (132)) as control variables. For example, if the mixing non-uniformity increases during the non-aeration reaction stage, the stirring condition calculation unit (340) can improve the mixing state by increasing the rotational speed and expanding the blade inclination angle, and during the sedimentation stage, it can ensure sludge sedimentation stability by decreasing the rotational speed or stopping the stirrer (100).

[0090] The above mixing non-uniformity prediction unit (350) is configured to predict the possibility of mixing non-uniformity based on the MLSS concentration deviation, DO concentration deviation, turbidity, viscosity, and stirring status information of the SBR reactor (30). The above mixing non-uniformity prediction unit (350) can determine that there is a high possibility of a local stagnation area being formed inside the reactor if the MLSS deviation or DO deviation measured at multiple points inside the reactor is greater than or equal to a reference value, or if an increase in viscosity and a decrease in flow rate occur simultaneously.

[0091] The cycle control unit (360) is configured to control the time of the inflow stage, reaction stage, sedimentation stage, and discharge stage of the SBR reactor (30). The cycle control unit (360) can calculate the aeration time, non-aeration time, sedimentation time, and discharge time based on DO concentration, ORP change rate, ammonia nitrogen concentration, nitrate nitrogen concentration, and sludge settling characteristics. For example, if the ammonia nitrogen concentration is above a reference value, the aeration time can be increased, if the nitrate nitrogen concentration is above a reference value, the non-aeration time can be increased, and if the sludge settling ability decreases, the sedimentation time can be increased.

[0092] The above control signal output unit (370) is configured to transmit the control value determined by the stirring condition calculation unit (340) and the cycle control unit (360) to the actual driving device. The above control signal output unit (370) can output a rotational speed control signal to the motor driving unit of the stirrer (100) and output a movement control signal of the operating shaft (132) to the control driving unit (133). In addition, the control signal output unit (370) can be connected to the blower (41), the inlet pump, the discharge pump, the discharge valve, and, if necessary, the sludge discharge valve so that the operating conditions of each device can be adjusted according to the process state.

[0093] The above-mentioned operation data learning unit (380) stores and learns the operation data collected from the characteristics sensing unit (310), the judgment result of the process state judgment unit (320), the control value of the stirring condition calculation unit (340), the prediction result of the mixing non-uniformity prediction unit (350), and the control result of the cycle control unit (360), thereby updating the optimal operation conditions and process control values ​​of the stirrer (100). The above-mentioned operation data learning unit (380) learns the correlation between the change in inflow load, aeration time, non-aeration time, the driving conditions of the stirrer (100), sedimentation stability, and the quality of the treated water, and subsequently calculates the optimal stirring conditions and cycle operation conditions under the same or similar inflow conditions.

[0094] The process state judgment unit (320) above can calculate a process state index P to quantitatively determine the operating state of the SBR reactor (30). For example, the process state index P can be calculated by assigning weights to the normalized values ​​of the inflow COD, SS, viscosity, MLSS, DO deviation, ORP deviation, and ammonia nitrogen concentration, and can be defined by the following formula.

[0095]

[0096] Here, C n is the normalized COD value, S n is the normalized SS value, μ n is the normalized viscosity value, M n is the normalized MLSS value, D n is the deviation value from the target DO, O n is the deviation value from the target ORP, N n represents the normalized ammonia nitrogen value, and inside represents the weight of each item. The process state judgment unit (320) can determine that the process state index P is above a reference value and is in a high load or unstable operating state.

[0097] The load prediction unit (330) can calculate a predicted load value L(t+1) using inflow characteristic data from the current time and past time to predict the inflow load in the next operating cycle. For example, the predicted load value L(t+1) is the current inflow load L(t), the previous inflow load L(t-1), and the flow rate change rate ΔQ t and viscosity change rate Δμ t It can be calculated using the following formula.

[0098]

[0099] Here, L(t) represents the COD load, BOD load, or nitrogen load at the current time point, and inside is a prediction coefficient corrected by the driving data learning unit (380). The load prediction unit (330) can generate a control value to preemptively increase the stirring intensity, aeration time, or reaction time of the SBR reactor (30) when the predicted load value is greater than or equal to the reference value.

[0100] The above stirring condition calculation unit (340) can calculate the rotational speed N and blade inclination angle θ of the stirrer (100) according to the mixing state of the SBR reactor (30). For example, the above stirring condition calculation unit (340) can calculate control variables so that the following objective function J is minimized.

[0101]

[0102] Here, F represents mixing non-uniformity, E represents energy consumption index, D represents deviation from target DO, and S represents sludge settling instability, and inside represents the weight of each item. The stirring condition calculation unit (340) can select a combination of rotational speed N and blade inclination angle θ that minimizes the objective function J and set it as the driving condition of the stirrer (100).

[0103] The above mixing non-uniformity prediction unit (350) can calculate the mixing non-uniformity F to quantitatively evaluate the mixing state of the SBR reactor (30). In one embodiment, the mixing non-uniformity F can be defined by the following equation.

[0104]

[0105] Here, ΔMLSS represents the MLSS concentration deviation value measured at multiple locations of the SBR reactor (30), and ΔDO represents the dissolved oxygen concentration deviation value measured at multiple locations, and T n is the normalized turbidity value, μ n represents a normalized viscosity value, N represents the rotational speed of the stirrer (100), and H represents a mixing uniformity index calculated based on the MLSS deviation at multiple points inside the SBR reactor (30). Also, inside represents a weighting coefficient to reflect the influence of each variable.

[0106] The cycle control unit (360) can calculate a cycle control value G to quantitatively control the intermittent aeration cycle. For example, the cycle control value G can be defined by the following equation using ammonia nitrogen concentration, nitrate nitrogen concentration, DO recovery rate, ORP change rate, and sludge settling instability.

[0107]

[0108] Here, NH 4n is the normalized ammonia nitrogen concentration, NO 3n is the normalized nitrate nitrogen concentration, R DO is DO recovery speed, R ORP is the ORP change rate, S S is sludge settling instability, inside represents the weight of each item. The cycle control unit (360) can adjust the aeration time, non-aeration time, sedimentation time, and discharge time according to the cycle control value G.

[0109] The above-mentioned driving data learning unit (380) can correct the weights of each algorithm using the difference between the actual processing result and the predicted result. For example, the driving data learning unit (380) predicts the processing number COD (COD pred ), predicted total nitrogen (TN pred ), predicted SS(SS pred ) and predicted DO(DO pred The loss function E using the error between ) and the actual measurement (obs). loss It is possible to calculate and update each weight so that the above loss function is reduced. inside represents the weight of each item.

[0110]

[0111] Accordingly, the artificial intelligence control unit (300) can repeatedly learn the correlation between the change in the characteristics of the influent wastewater, the driving conditions of the agitator (100), the intermittent aeration cycle, and the water quality of the treated water, and calculate the optimal process control value under the same or similar operating conditions.

[0112] Hereinafter, the contents of the present invention will be explained in detail with reference to an example of a stirrer (100) mounted inside an SBR reactor (30).

[0113] As shown in FIG. 2, the above-mentioned stirrer (100) is a device installed inside the SBR reactor (30) to receive rotational force and stir a mixture of wastewater and activated sludge, and includes a rotating shaft (110) that transmits rotational force by a rotary drive unit (140) and a plurality of blades (120) coupled to the rotating shaft (110) to form a fluid flow.

[0114] The above-mentioned stirrer (100) is configured to improve the uniformity of mixing of the mixture by forming a mixing flow inside the SBR reaction tank (30) through rotation. Accordingly, the above-mentioned stirrer (100) can perform the function of reducing the variation in the concentration of the mixture inside the SBR reaction tank (30) and reducing the occurrence of stagnant areas inside the treatment tank.

[0115] As shown in FIGS. 2 and 3, each of the above blades (120) has a blade shaft (122) as its central axis, and the blade shaft (122) is installed to be rotatable on a rotation axis (110).

[0116] Preferably, the blade shaft (122) is installed in the center of the blade (120) and can be rotatably supported with respect to the rotation axis (110) by a bearing. Accordingly, the blade (120) rotates as a whole by the rotation of the rotation axis (110), while the angle of inclination can be adjusted around the blade shaft (122).

[0117] The above-described stirrer (100) further includes an angle adjustment unit (130) that adjusts the inclination angle of the blade (120) by rotating the blade shaft (122). The angle adjustment unit (130) may include an operating space (131), an operating shaft (132), an adjustment drive unit (133), a driven gear (134), a drive block (135), and a rack gear (136).

[0118] The above operating space (131) is formed inside the rotation shaft (110), and the rotation shaft (110) may have a plurality of unit shafts (111) of a certain length connected in series, and in this case, the operating space (131) formed inside each unit shaft (111) may be formed to be in communication with each other.

[0119] The above operating shaft (132) is installed to be movable along the operating space (131) and may be formed as a single unit or may be formed by connecting a plurality of unit shafts (132a) having a certain length in series. The upper end of the above operating shaft (132) may be formed to protrude upward from the rotation axis (110), and the control drive unit (133) is installed adjacent to the upper end of the rotation axis (110) and configured to move the above operating shaft (132) in the longitudinal direction (or vertical direction) of the operating space (131).

[0120] The above-mentioned driven gear (134) is installed at the end of the blade shaft (122) of each blade (120) and can be positioned within the operating space (131) of the rotation axis (110). The above-mentioned driving block (135) is coupled to the operating shaft (132) and moves together with the operating shaft (132), and can be positioned at a location corresponding to each blade (120) installed on the rotation axis (110).

[0121] In the above-mentioned drive block (135), block protrusions (135a) may be formed protruding on both sides relative to the driven gear (134), and a rack gear (136) that meshes with the driven gear (134) is formed on the block protrusions (135a).

[0122] As in one embodiment illustrated in FIG. 3, when a plurality of blades (120) are installed radially with respect to a rotation axis (110), a plurality of block protrusions (135a) corresponding to each blade (120) may be formed on the outer circumference of the drive block (135), and a rack gear (136) formed on each block protrusion (135a) may mesh with a corresponding driven gear (134). Accordingly, the inclination angle of the plurality of blades (120) can be adjusted simultaneously or in conjunction by the movement of a single operating shaft (132).

[0123] When examining the operating state of the angle adjustment unit (130) as shown in FIG. 4, when the operating shaft (132) moves along the operating space (131) by the adjustment drive unit (133), the drive block (135) coupled to the operating shaft (132) moves together. At this time, the rack gear (136) of the drive block (135) moves linearly, and the driven gear (134) meshed with the rack gear (136) rotates, and the blade shaft (122) rotates according to the rotation of the driven gear (134), thereby the inclination angle of the blade (120). The stirring direction and stirring intensity of the fluid can be controlled according to the viscosity, MLSS concentration, flow rate, and SBR operation stage of the wastewater.

[0124] In addition, the blade (120) can be configured to variably form a mixing state in response to changes in fluid resistance by means of a folding structure of the first blade (124) and the second blade (126). Accordingly, a stable mixing state can be maintained even when changes in the viscosity of wastewater or the flow rate of the mixture occur, and excessive mixing can be mitigated during the sedimentation stage, thereby improving the stability of sludge sedimentation.

[0125] Each of the above blades (120) may include a first blade (124), a second blade (126), and a blade original position portion (128), as shown in FIGS. 3 and 5. The first blade (124) and the second blade (126) may be positioned on both sides relative to the blade shaft (122) and may be formed to be foldable according to fluid resistance.

[0126] The above blade original position part (128) is an elastic configuration and performs the function of returning the folded first blade (124) and second blade (126) to an unfolded state (or restoring the position by restoring force).

[0127] Here, the blade return portion (128) uses a torsion spring as shown in FIG. 3 in one embodiment, and one end of the torsion spring is fixed to the blade shaft (122) and the other end is fixed to the first blade (124) or the second blade (126), and is returned to its original position by a force that returns it to its original state after being folded according to the degree of fluid resistance.

[0128] That is, the first blade (124) and the second blade (126) can repeat folding and returning operations based on the blade shaft (122) according to the flow rate, viscosity, and sludge concentration of the wastewater when the stirrer (100) rotates. Since the mixing state inside the SBR reactor (30) can be formed in response to various operating conditions through this folding and returning operation, it can contribute to improving the uniformity of mixing and reducing localized sludge deposition.

[0129] Additionally, as illustrated in FIG. 6, the first blade (124) and the second blade (126) may be composed of a plurality of first blade segments (125) and second blade segments (127). Each of the plurality of first blade segments (125) and second blade segments (127) is formed to be individually foldable and can be returned to its original state by the blade original position portion (128). Accordingly, instead of the entire blade being deformed uniformly, individual folding and return can be achieved for each part where fluid resistance is significant, thereby improving responsiveness to changes in wastewater characteristics and SBR operation stages.

[0130] As such, the stirrer (100) of the present invention can variably form a mixed flow inside the treatment tank by a combination of a rotating shaft (110), a blade (120), an angle adjustment part (130), a first blade (124), a second blade (126), a first blade piece (125), and a second blade piece (127). Accordingly, the present invention can improve the uniformity of mixing inside the SBR reaction tank (30) and reduce the variation in the concentration of the mixed liquid and the occurrence of local stagnation areas.

[0131] The operating conditions and treatment results of a small-scale wastewater treatment system based on intermittent aeration SBR according to one embodiment of the present invention are described in more detail below. However, the following embodiments are merely examples to aid in understanding the present invention, and the scope of the present invention is not limited thereto.

[0132] [Example]

[0133] Hereinafter, the operating conditions and treatment results of a small-scale wastewater treatment system based on intermittent aeration SBR according to one embodiment of the present invention will be explained in more detail by way of example. However, the following examples are merely illustrative to aid in understanding the present invention, and the scope of the present invention is not limited thereto.

[0134] In this embodiment, an intermittent aeration SBR-based wastewater treatment system was constructed for influent wastewater mixed with domestic wastewater from rural areas and restaurant wastewater, comprising an influent tank (10), an equalization tank (20), an SBR reaction tank (30), an aeration unit (40), a treatment tank (50), and an artificial intelligence control unit (300).

[0135] The average characteristics of the raw water flowing into the inflow tank (10) were COD 520 mg / L, BOD 310 mg / L, SS 340 mg / L, total nitrogen (TN) 58 mg / L, ammonia nitrogen (NH₄-N) 36 mg / L, total phosphorus (TP) 6.8 mg / L, pH 7.2, and turbidity 210 NTU. The inflow tank (10) was configured to include a screen for removing coarse debris and was operated to have an effective retention time of about 30 minutes to relieve the instantaneous inflow load.

[0136] The wastewater that passed through the inflow tank (10) was supplied to the equalization tank (20), and the equalization tank (20) was operated under a hydraulic retention time (HRT) of 3 hours. A properties detection sensor (21) installed in the equalization tank (20) was configured to measure COD, SS, turbidity, viscosity, pH, water temperature, and flow rate, and the selective circulation mixing unit (22) was operated under low-speed stirring conditions of 45 rpm. At this time, the average viscosity of the wastewater in the equalization tank (20) was measured as 5.8 mPa·s, the average turbidity as 185 NTU, and the average SS as 290 mg / L.

[0137] The wastewater that passed through the equalization tank (20) was supplied to the SBR reactor (30). The SBR reactor (30) was configured with an effective volume of 12 m³ and a single operation cycle was set to 6 hours so that it could be operated repeatedly 4 times a day. The single operation cycle consisted of an inflow stage of 1 hour, a reaction stage of 3 hours and 30 minutes, a sedimentation stage of 1 hour, and a discharge stage of 30 minutes. In the reaction stage, the aeration time of 30 minutes and the non-aeration time of 30 minutes were repeated using an intermittent aeration method.

[0138] The mixture of the above SBR reactor (30) was maintained at MLSS 4,800 mg / L and MLVSS 3,200 mg / L, and the dissolved oxygen (DO) was maintained at 2.2 mg / L during the aeration stage, and the dissolved oxygen (DO) was operated to be lowered to 0.3 mg / L or less during the non-aeration stage. In addition, the oxidation-reduction potential (ORP) was maintained at -130 mV during the non-aeration stage, and the pH was operated at 7.1 and the water temperature at 23℃.

[0139] The above aeration unit (40) is configured to include a known blower, an air supply pipe, and a diffuser, and the blower is controlled to operate intermittently by an artificial intelligence control unit (300). In this embodiment, the air supply amount of the aeration unit (40) is set to 0.8 m³ / min per 1 m³ of effective volume of the SBR reactor (30), and the aeration time is set to increase up to 40 minutes when the ammonia nitrogen concentration increases above a reference value. Conversely, when the nitrate nitrogen concentration increases and the ORP is maintained higher than the target range, the non-aeration time is set to increase up to 45 minutes.

[0140] A stirrer (100) illustrated in FIGS. 2 to 6 is installed inside the SBR reactor (30). The stirrer (100) is configured to include a rotating shaft (110), a plurality of blades (120), an angle adjustment unit (130), a first blade (124), a second blade (126), a first blade piece (125), and a second blade piece (127). The rotational speed of the stirrer (100) is basically set to 100 rpm and is configured to be variably controlled within the range of 60 to 150 rpm by an artificial intelligence control unit (300). In addition, the basic inclination angle of the blade (120) is set to 28° and is set to increase up to 45° when the degree of non-uniformity of mixing increases or the viscosity of the mixed liquid increases.

[0141] In particular, the first blade (124) and the second blade (126) of the agitator (100) are configured to partially fold and return according to changes in the flow rate, viscosity, and sludge concentration of the mixed liquid. Accordingly, a sufficient mixing state is maintained during the aeration stage and the non-aeration reaction stage, and during the sedimentation stage, the rotation speed of the agitator (100) is reduced to 20 rpm or less or stopped to ensure sludge sedimentation stability.

[0142] The artificial intelligence control unit (300) is configured to include a properties sensing unit (310), a process state judgment unit (320), a load prediction unit (330), a stirring condition calculation unit (340), a mixing non-uniformity prediction unit (350), a cycle control unit (360), a control signal output unit (370), and an operation data learning unit (380). The properties sensing unit (310) is configured to measure COD, SS, turbidity, viscosity, flow rate, pH, water temperature, ammoniacal nitrogen, nitrate nitrogen, DO, ORP, MLSS, sludge interface height, and treated water turbidity.

[0143] The artificial intelligence control unit (300) calculated the degree of mixing non-uniformity based on the MLSS concentration deviation, DO concentration deviation, and turbidity measured at multiple points inside the reactor. In this embodiment, it was set to determine that the risk of mixing non-uniformity has increased if the MLSS concentration deviation is 650 mg / L or more or the DO deviation is 0.8 mg / L or more. In this case, the artificial intelligence control unit (300) controlled the rotation speed of the stirrer (100) to increase from 100 rpm to 135 rpm and to expand the blade inclination angle from 28° to 40°.

[0144] In addition, the cycle control unit (360) is configured to adjust the aeration time, non-aeration time, sedimentation time, and discharge time based on the ammonia nitrogen concentration, nitrate nitrogen concentration, DO recovery rate, ORP change rate, and sludge sedimentation state. In this embodiment, when the ammonia nitrogen concentration is 12 mg / L or higher, the aeration time is increased from 30 minutes to 40 minutes, and when the nitrate nitrogen concentration is 18 mg / L or higher, the non-aeration time is increased from 30 minutes to 45 minutes. In addition, during the sedimentation stage, if the sludge interface height is higher than the reference value or the turbidity of the treated water increases, the sedimentation time is controlled to be increased from 60 minutes to 75 minutes.

[0145] As a result of operating continuously for about 90 days under the above conditions, the variation in the concentration of the mixed liquid and the variation in the DO concentration inside the SBR reactor (30) decreased, and it was confirmed that a stable biological reaction was maintained even when switching between aeration and non-aeration. In addition, the sludge settling properties were maintained stably during the sedimentation stage, so the SS and turbidity of the treated water were kept low.

[0146] Operating conditions according to an embodiment of the present invention division Driving conditions division Driving conditions Incoming COD 520 mg / L Reaction step 3.5 hr Inflow BOD 310 mg / L Sedimentation stage 1 hr Inflow SS 340 mg / L Discharge stage 0.5 hr Total nitrogen (TN) inflow 58 mg / L Aeration time 30 min Influent ammonia nitrogen (NH4-N) 36 mg / L Non-aeration time 30 min Total Phosphorus Inflow (TP) 6.8 mg / L MLSS 4,800 mg / L Inflow pH 7.2 MLVSS 3,200 mg / L Inflow turbidity 210 NTU Aeration stage DO 2.2 mg / L Equalization tank HRT 3hr Non-aeration phase DO 0.3 mg / L or less Equalization tank stirring speed 45 rpm Non-aeration phase ORP -130 mV SBR reactor effective volume 12㎥ Air supply amount 0.8 m³ / min / m³ 1 driving cycle 6 hr basic rotation speed of the stirrer 100 rpm Inflow stage 1hr Stirrer variable rotation speed 60~150 rpm Basic blade bevel angle 28° Maximum blade inclination angle 45°

[0147] In addition, Table 2 shows the changes in water quality of the influent and treated water according to an embodiment of the present invention.

[0148] Changes in influent and treated water quality division Inflow water treated water COD (mg / L) 520 18 BOD (mg / L) 310 5 SS (mg / L) 340 6 Total Nitrogen (TN) (mg / L) 58 13 Ammonia nitrogen (NH4-N) 36 2.1 Total Phosphorus (TP) (mg / L) 6.8 1.1 Turbidity (NTU) 210 3.2

[0149] In addition, in this embodiment, to verify the variable mixing control effect of the stirrer (100), the operation results were compared with a comparative example in which a general stirrer with a fixed blade angle was applied. In the comparative example, instead of the stirrer (100) of the present invention, a general propeller-type stirrer with a fixed blade angle was installed in the SBR reactor (30), and the rotation speed was fixed at 100 rpm. Other than that, the influent water characteristics, SBR operation cycle, aeration conditions, MLSS concentration, and sedimentation conditions were maintained identically to the embodiment of the present invention.

[0150] Comparison of operating performance based on stirrer structure division Examples of the present invention Comparative example Mixing uniformity index 0.94 0.72 MLSS concentration deviation 280 mg / L 760 mg / L DO deviation ±0.25 mg / L ±0.90 mg / L Frequency of occurrence of stagnation areas Very low height turbidity of treated water during sedimentation stage 3.2 NTU 8.7 NTU Sludge settling stability excellence commonly Nitrogen removal rate 77.6 % 63.4 % Energy usage 14% decrease from baseline Standard level

[0151] Here, the above mixing uniformity index was calculated based on the MLSS concentration deviation measured at multiple points inside the SBR reactor (30). The above mixing uniformity index can be calculated by normalizing the standard deviation of the MLSS concentration between measurement points to the average concentration.

[0152] From the above results, it was confirmed that the intermittent aeration SBR-based wastewater treatment system including the stirrer (100) according to the present invention can improve the uniformity of mixing and sedimentation stability inside the reaction tank even under intermittent aeration operating conditions, and can reduce energy consumption due to the operation of the blower and stirrer while stably maintaining nitrogen removal efficiency.

[0153] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0154] 10: Inflow tank 20 : Equalization 21 : Star formation detection sensor 22: Selective Circulation Mixing Unit 30 : SBR reactor 40: Aeration section 50 : Treatment tank 100 : Stirrer 110 : Rotation axis 120 : Blade 122 : Blade shaft 124 : 1st Blade 125: The First Blade Arc 126 : 2nd Blade 127: The Second Blade Arc 128 : Blade original position part 130 : Angle adjustment part 131 : Operating space 132 : Operating shaft 133 : Control drive unit 134 : Driven gear 135 : Drive block 135a : Block protrusion 136 : Rack gear 300 : Artificial Intelligence Control Unit 310 : Character Sensing Unit 320 : Process Status Judgment Unit 330 : Load Prediction Unit 340 : Stirring Condition Calculation Unit 350 : Mixing Non-uniformity Prediction Unit 360 : Cycle Control Unit 370 : Control signal output section 380 : Driving Data Learning Department

Claims

Claim 1 In an intermittent aeration SBR-based wastewater treatment system, the system comprises: an inlet tank (10) into which domestic wastewater or industrial wastewater flows; an equalization tank (20) that stores wastewater passing through the inlet tank (10) and mitigates fluctuations in flow rate and water quality; an SBR reactor (30) equipped with an agitator (100) inside and sequentially performs inflow, reaction, sedimentation, and discharge processes for wastewater flowing in from the equalization tank (20); an aeration unit (40) that supplies air to the SBR reactor (30); a treated water tank (50) that stores treated water discharged during the discharge stage of the SBR reactor (30); and an artificial intelligence control unit (300) that controls the operating state of the agitator (100) according to changes in the characteristics of the wastewater, wherein the agitator (100) comprises: a rotating shaft (110) that transmits rotational force; and a plurality of blades (120) coupled to the rotating shaft (110) to form a fluid flow. and a rotary drive unit (140) for rotating a plurality of blades by rotating the rotary shaft (110); wherein the blade (120) has a blade shaft (122) as a central axis, and the blade shaft (122) is installed to be rotatable with respect to the rotary shaft (110); and the stirrer (100) includes an angle adjustment unit (130) for adjusting the inclination angle of the blade (120), wherein the angle adjustment unit (130) comprises: an operating space (131) formed inside the rotary shaft (110); an operating shaft (132) installed to be movable along the operating space (131); an adjustment drive unit (133) for moving the operating shaft (132) in the longitudinal direction of the operating space; a driven gear (134) installed at the end of the blade shaft (122) to rotate the blade shaft; a drive block (135) coupled to the operating shaft (132) and moving together; and the A rack gear (136) formed in the drive block (135) to mesh with the driven gear (134); and the blade (120) comprises a first blade (124) and a second blade (126) that are formed to be foldable and arranged on both sides with respect to the blade shaft (122);and a blade original position unit (128) for returning the folded first blade (124) and second blade (126) to an unfolded state; wherein the first blade (124) and second blade (126) are each composed of a first blade piece (125) and a second blade piece (127) formed to be individually foldable by being segmented into multiple parts, and the artificial intelligence control unit (300) comprises: a properties sensing unit (310) for collecting sensing information from sensors installed in the inflow tank (10), equalization tank (20), SBR reactor (30), aeration unit (40), and treatment tank (50); a process state judgment unit (320) for determining the process state of the current SBR operation stage based on data collected from the properties sensing unit (310); and predicting the inflow load in the subsequent cycle based on past and present data collected from the equalization tank (20) and the SBR reactor (30). A load prediction unit (330); a stirring condition calculation unit (340) that calculates the rotational speed of the stirrer (100) and the inclination angle of the blade (120) based on information collected from a sensor installed in the SBR reactor (30); a mixing non-uniformity prediction unit (350) that predicts the possibility of mixing non-uniformity based on information collected from a sensor installed in the SBR reactor (30); a cycle control unit (360) that controls the time of the inflow stage, reaction stage, sedimentation stage, and discharge stage of the SBR reactor (30); a control signal output unit (370) that outputs the control value calculated by the stirring condition calculation unit (340) and the cycle control unit (360); and storing and learning the information collected by the properties sensing unit (310), the judgment result from the process state judgment unit (320), the calculated value from the stirring condition calculation unit (340), the prediction result from the mixing non-uniformity prediction unit (350), and the control result from the cycle control unit (360). An operation data learning unit (380) that updates the operating conditions and process control values ​​of the stirrer (100);An intermittent aeration SBR-based wastewater treatment system comprising: a rotating shaft (110) in which a plurality of unit shafts (111) are interconnected in series; an operating shaft (132) formed by a plurality of unit shafts (132a) being connected in series; and a blade original positioning part (128) comprising a torsion spring, wherein one end of the torsion spring is fixed to the blade shaft (122) and the other end is fixed to the first blade (124) or the second blade (126). Claim 2 delete Claim 3 delete

Images