KR100628908B1 - Method and apparatus for instrumentation and control of membrane coupled activated sludge method and reactor operating anoxic/anaerobic process alternatively for removal of nitrogen and phosphorus - Google Patents

Abstract

The present invention provides a measurement control method and apparatus for an anoxic and anaerobic process alternating membrane separation activated sludge process for simultaneous treatment of nitrogen and phosphorus. According to this, it is easy to operate, easy to maintain, processing efficiency and processing by measuring and controlling the return cost, return time for anoxic and anaerobic process shift operation, sludge waste amount, aeration amount and blower operation for intermittent membrane cleaning. Capacity can be maximized and running costs can be reduced to achieve economic effects. In addition, since the return flow rate is controlled according to the inflow flow rate, the concentration of the effluent nitrate nitrogen can be properly maintained, and the sludge waste amount can be smoothly removed to adjust the sludge waste so that the appropriate solids residence time (SRT) is maintained. Furthermore, since the anaerobic / anaerobic reaction is controlled according to the internal state of the anaerobic / anaerobic alternating operation reactor through automatic measurement control, the concentration of nitrogen and phosphorus in the treated water can be reduced by efficiently using the organic matter in the influent.

Anaerobic, anaerobic, shift operation, measurement control, return cost, return time, sludge waste volume, aeration amount, blower, internal conveying pump

Description

Method and apparatus for instrumentation and control of membrane coupled activated sludge method and reactor operating anoxic / anaerobic process alternatively for removal of nitrogen and phosphorus}

Figure 1 is a schematic diagram showing the anaerobic and anaerobic processes of the anaerobic and anaerobic process alternating membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus.

Figure 2 is a schematic diagram showing a measurement control device of an oxygen-free and anaerobic process alternate operation type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention.

Figure 3 is a flow chart showing the internal transfer pump measurement control of the anaerobic and anaerobic process alternating operation membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention.

Figure 4 is a flow chart showing the blower measurement control of the anaerobic and anaerobic process alternating operation membrane separation activated sludge method for the simultaneous treatment of nitrogen and phosphorus according to the present invention.

* Description of the symbols for the main parts of the drawings *

R1: anaerobic / anaerobic shift reactor R2: aerobic reactor

F1: inflow water F2: treated water

F3: Return Flow F4: Surplus Sludge

A1: Submersible Agitator A2: Transfer Pump

A3: Blower FM1: Inflow Flowmeter

FM2: Return Flow Meter FM3: Surplus Sludge Flow Meter

S1: redox potential sensor S2: dissolved oxygen concentration (DO) sensor

C1: PC C2: Analog / Digital Converter

The present invention relates to a method and apparatus for measuring and controlling anoxic and anaerobic alternating operation type membrane separation activated sludge method for simultaneous treatment of nitrogen and phosphorus, and in detail, an anoxic process and an anaerobic process by intermittent internal conveying according to a time interval. By using a membrane separation activated sludge system composed of two reactors, an anaerobic / anaerobic alternating reactor and an aerobic reactor equipped with immersion separators operated continuously, nitrogen and phosphorus are simultaneously mixed with organic matter in sewage and wastewater. In the operation of the advanced sewage and wastewater treatment method, it is easy and efficient to measure and control the return cost, the return time for the anaerobic and anaerobic process shift operation, the sludge waste amount, the aeration amount and the operation of the blower for intermittent membrane cleaning. Simultaneous treatment of nitrogen and phosphorus due to its large capacity and low operating cost For it relates to anaerobic and anaerobic process shift operating membrane separation process measurement and control of the activated sludge process and apparatus.

When nitrogen and phosphorus contained in sewage and wastewater are discharged without treatment, it causes eutrophication of rivers and lakes, which adversely affects water resources and aquatic ecosystems, and especially when infants drink large amounts of nitrate nitrogen. May cause cyanosis and require treatment. Therefore, several advanced treatment methods have been devised for the treatment of nitrogen and phosphorus, which are becoming more regulated, and representative processes include Modified Ludzack-Ettinger (MLE), A ₂ O, University of Cape Town (UCT), and Modified University (MUCT). bio-treatment techniques such as of Cape Town and VIP Initiative Plant.

However, these typical processes consist of several reactors and internal circulating pumps, which are difficult to maintain optimum conditions for the removal of nitrogen and phosphorus and are very complicated to operate. It is difficult to keep the concentration of the microorganisms high. In addition, the processes have many problems in efficient treatment due to the inflow of fluctuations of microorganisms due to the impact load, such as fluctuations in inflow load and influx of toxic substances, to reduce the water quality or the loss of active microorganisms. In addition, two or more independent reactors and the end of the sedimentation tank must be installed, so it takes up a large site and is not suitable for small and medium-sized sewage and wastewater treatment.

In order to solve this problem, various sewage and wastewater advanced treatment methods using membrane activated sludge methods using a separator for solid-liquid separation have been tried. However, even in this case, it is necessary to arrange several reactors for the advanced treatment, and there are disadvantages such as difficulty in removing phosphorus.

One such conventional treatment method is a "drainage treatment method (Japanese Patent Laid-Open No. 7-100486). This method consists of a first treatment tank which induces nitrification and denitrification through an intermittent aeration and a second treatment tank which is equipped with an immersion type membrane for solid-liquid separation to remove nitrogen and allow continuous suction filtration. However, this method cannot create an anaerobic condition for the removal of phosphorus, so that phosphorus removal cannot be effectively achieved, and a second treatment tank is separately installed for continuous suction filtration to prevent contamination of the membrane. Since additional aeration is required, the energy cost of the aeration is doubled.

Another conventional method is an apparatus and method for removing biological nitrogen phosphorus using an immersion membrane (Korean Patent Publication No. 2002-44820). This method induces simultaneous removal of nitrogen and phosphorus by installing anaerobic tank, anaerobic tank, aerobic tank and degassing tank sequentially. However, in this case, an anaerobic tank should be additionally used for phosphorus removal, and in the case of sewage with a low C / N ratio, which is a characteristic of domestic sewage, most of the carbon source is used for denitrification in an anaerobic tank installed at the front end. There is a disadvantage that there is a limit to the removal of phosphorus due to the lack of a carbon source required for phosphorus release.

By the present inventors to solve the problems of the prior art, the anoxic / anaerobic alternating reactor and the immersion type separation membrane is continuously operated by an anoxic process and the anaerobic process by alternating internal transport over time intervals An anaerobic and anaerobic process alternating membrane separation sludge process for the simultaneous treatment of nitrogen and phosphorus, which employs two reactors of the aerobic reactor equipped with this, has been proposed (see Korean Patent No. 412330).

Figure 1a schematically shows an anoxic treatment process in the "oxygen-free and anaerobic alternating membrane separation sludge process for the simultaneous treatment of nitrogen and phosphorus," Figure 1b is an anoxic for the simultaneous treatment of nitrogen and phosphorus And anaerobic shift type membrane separation activated sludge process ", which schematically shows the anaerobic treatment process.

As shown in Figure 1, the device according to the "oxygen-free and anaerobic alternating type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus, the oxygen-free / anaerobic alternating type of activated sludge mixture from the aerobic reaction tank (5) An anoxic / anaerobic alternating reactor (2) equipped with a stirrer (3) to alternate between anoxic conditions and anaerobic conditions by intermittently interposing the internal conveying pump (4) to be returned to the reactor (2) at a time interval; And an aerobic reaction tank 5 equipped with an immersion type separation membrane 6 in which continuous aeration and membrane filtration are performed.

The "oxygen-free and anaerobic process-operated membrane separation activated sludge process for simultaneous treatment of nitrogen and phosphorus" is characterized by the characteristics of a continuous batch reactor capable of high-treatment with low site and a continuous reactor with a high treatment capacity, and a stable outflow. It is combined with membrane separation method that can satisfy the water quality.Its operation enables stable operation, responds quickly and appropriately to the occurrence of abnormalities, increases productivity, and further reduces workforce's work. There is a need to automate its operation.

On the other hand, with the development of computers in recent years, with the emergence of reliable measurement equipment, a lot of researches are being conducted to monitor sewage or wastewater treatment plants and to perform diagnosis and process control using data obtained therefrom.

In this way, measurement equipment is installed in the process to grasp the quantitative and qualitative data of the process to monitor the status and use the data to operate the equipment or device in the most optimal state.

As an example of measurement control, the measurement control of a wastewater treatment plant is known a lot. For example, there is a method of operating a blower operation of a continuous batch reactor in a process method by attaching a timer to set the blower operation and the non-operation time.

In addition, other methods for performing real-time measurement are known. For example, control techniques have been developed that utilize absolute or time-varying values using redox potential (ORP), hydrogen (pH), and dissolved oxygen (DO) sensors <US 5,303,308 A: US 5624565 A; US 6,093,322 A; US 6,527,956 B1; See JP 1994-055190>.

In addition, in the case of continuous reactors, a technique for controlling the amount of air supplied to the aerobic tank by measuring DO is known <US 4,537,682 A; 0,112,829 A1>, a method for controlling the return rate by calculating the difference between the influent and the anoxic ORP values is also presented (see US 5,733,456 A).

However, these conventional measurement methods are not suitable for the "oxygen-free and anaerobic process alternating membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus" and the measurement method or apparatus for automatic operation of the process in real time yet. Has not been developed.

Accordingly, the present invention is to solve the problems of the prior art as described above, the object of the present invention is easy to operate, can maximize the processing efficiency and processing capacity, can reduce the running cost and economical To provide a measurement control method and apparatus suitable for anoxic and anaerobic alternating operation type membrane separation activated sludge process for simultaneous treatment of nitrogen, phosphorus and phosphorus.

In order to achieve the object as described above, the measurement control method of the anaerobic and anaerobic process alternating operation type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention, the anaerobic process, sewage, sewage, or wastewater (A) inflowing into an anaerobic / anaerobic alternating reactor as an inflow source water; (B) operating an internal transfer pump that is operated intermittently to continuously transport internally the nitrate nitrogen generated in the aerobic reaction tank to make the anaerobic / anaerobic shift driving reactor anoxic; (C) converting the nitrate nitrogen supplied through the internal transport of step (b) into nitrogen gas by using the organic material in the continuously introduced inflow water as a carbon source; (D) flowing the denitrification-treated mixture in step (c) to the subsequent aerobic reaction tank; Under the aerobic conditions of the aerobic reaction tank with continuous aeration by a blower, the nitrification process for converting organic nitrogen and ammonia nitrogen supplied from the influent by the nitrification microorganism into nitrate nitrogen and the organic matter oxidation process for decomposing the remaining organic matter are carried out. Step (e); And (f) continuously discharging the treated water using an immersion type membrane installed in the aerobic reaction tank, and the anaerobic process continuously replaces anaerobic / anaerobic operation by using sewage, sewage, or wastewater as inflow water. Introducing into the reactor (a '); Stopping the operation of the internal transfer pump operating intermittently to stop the internal transport of nitrate nitrogen generated in the aerobic reaction tank to make the anaerobic / anaerobic shift driving reactor anaerobic (b '); (C ') releasing phosphorus to dephosphorized microorganisms by using organic matter in the continuously introduced influent water as a carbon source in an anaerobic state in which denitrification of nitrogen nitrate is depleted due to the stop of internal transport of step (b); (D ') flowing over the microorganisms having released phosphorus in the step (c') to an aerobic reaction tank followed; Under the aerobic conditions of the aerobic reaction tank with continuous aeration by the blower, the concentration of dissolved phosphorus in the aerobic reaction tank is reduced by the phosphorus excess intake of the phosphorus-releasing microorganism in the step (d '), and at the same time, the organic matter supplied from the influent by the nitrifying microorganism (E ') proceeding with the nitrification process for converting nitrogen and ammonia nitrogen to nitrate nitrogen and the organic matter oxidation process for decomposing the remaining organic matter; Continuously discharging the treated water from which phosphorus has been removed using an immersion membrane installed in the aerobic reaction tank (f '); And (g ') discharging the sludge in a state in which the phosphorus in the step (e') is excessively ingested and discharging the phosphorus, wherein the anaerobic process and the anaerobic process of the anaerobic / anaerobic shift driving reactor are performed. The classification is based on the internal transport of nitrate nitrogen by the internal transport pump, and the nitrogen and phosphorus treatment for the simultaneous treatment of nitrogen and phosphorus, which alternates between the anaerobic process for denitrification and the anaerobic process for phosphorus release, is carried out. A measurement control method of an advanced wastewater treatment method, comprising: a conveyance ratio control step (S1) of maintaining a ratio of an internal conveyance flow rate of the nitrate nitrogen to an inflow flow rate of the inflowing raw water; A conveyance time control step (S2) of continuously measuring a redox potential (ORP) value in the anoxic / anaerobic alternating operation reactor and determining whether to operate the internal conveying pump in response to the measured value; Blower control step (S3) of continuously measuring the dissolved oxygen concentration (DO) in the aerobic reaction tank when the internal transfer pump is operating and adjusting the rotational speed of the blower to maintain a constant level of the dissolved oxygen concentration (DO) ); And a sludge waste amount control step (S4) of determining the sludge waste amount according to Equation 1 below to discard the sludge.

Where FR is the sludge waste rate (m ³ / day), S _{anaerobic / anaerobic shift reactor} is the sludge concentration in the anaerobic / anaerobic shift reactor (kg / m ³ ), and S _{aerobic reactor} is the sludge concentration in the aerobic reactor (kg / m ³ ), V _{anaerobic / anaerobic reactor} is the volume of anoxic / anaerobic reactor (m ³ ), V _{aerobic reactor} is the volume of aerobic reactor (m ³ ), and SRT _d is the set average solid residence time ( Solids Retention Time (SRT) (in days).

In the step S1, it is preferable to control the ratio of the internal transport flow rate of nitrate nitrogen to the inflow flow rate of the incoming raw water through a proportional controller.

Further, the step S2 is continued in the state that the internal conveying pump is operating, continuously measuring the redox potential (ORP) in the oxygen-free / anaerobic alternating reactor type reaction tank when the redox potential (ORP) value is less than -100mV. To operate the internal transfer pump, stop the operation of the internal transfer pump when the ORP value exceeds -100 mV, and in the state where the internal transfer pump is not operated, the anoxic / anaerobic shift It is preferable to operate the internal transfer pump when the redox potential (ORP) in the operating reactor is continuously measured so that the redox potential (ORP) becomes less than -400 mV.

In the step S3, when the internal transfer pump is not operated, it is preferable to perform a process of cleaning the membrane by maximizing the rotational speed of the blower for a predetermined time.

And, in the step S3, in the state in which the internal conveying pump is operating, adjusting the rotational speed of the blower so that the dissolved oxygen concentration (DO) in the aerobic reaction tank is not less than 2.0mg / l, the internal conveying pump is operated In a state where it is not, it is preferable to measure the operation stop time of the internal transfer pump and to clean the membrane by maximizing the rotational speed of the blower when the operation stop time is more than 1 minute and less than 10 minutes.

In the step S4, when the sludge waste amount is determined, the SRT _d of Equation 1 is preferably 20 days.

In order to achieve the above object, the measurement control device of the anaerobic and anaerobic process alternating operation type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention, the inflow source of sewage, sewage, or wastewater is continuous An anaerobic / anaerobic shift reactor equipped with a stirrer introduced into the reactor; An aerobic reactor equipped with a blower to cause organic matter oxidation, nitrification reaction, and excessive intake of phosphorus in an aerobic state; An internal transfer pump for returning nitrate nitrogen generated from the aerobic reaction tank to the anoxic / anaerobic alternating operation reactor; And an immersion type separation membrane mounted in the aerobic reaction tank for continuously discharging the treated water through membrane filtration, wherein the separation between the anoxic process and the anaerobic process in the anoxic / anaerobic alternating reactor is performed by the internal transfer pump. The operation of the sewage and wastewater treatment system for simultaneous treatment of nitrogen and phosphorus in which the anoxic process for denitrification takes place and the anaerobic process for releasing phosphorus, which are classified according to the internal transport of nitrate nitrogen, is performed. An instrument for controlling measurement, comprising: a redox potential measuring sensor (ORP) measuring an redox potential (ORP) inside an anaerobic / anaerobic alternating reactor; Dissolved oxygen concentration (DO) sensor for measuring the dissolved oxygen concentration (DO) in the aerobic reaction tank; An inflow flow meter for measuring and controlling the flow rate of the inflow source water; A conveying flow meter for measuring and controlling the inner conveying flow rate; Excess sludge flowmeter for measuring and controlling the amount of waste sludge discharged from the aerobic reaction tank; And a processor for controlling the internal conveying pump, the blower, and the respective flowmeters in response to the measured value information input from the sensors and the flowmeters.

In addition, the processor is preferably composed of a digital input / output computer and an analog / digital converter (A / D converter) for converting the output digital signal to an analog signal to output and converts the input analog signal into a digital signal. .

Hereinafter, a measurement control method and apparatus for an anoxic and anaerobic process alternating operation type membrane separation activated sludge method for simultaneous treatment of nitrogen and phosphorus according to the present invention will be described in detail with reference to the drawings.

Figure 2 is a schematic diagram showing a measurement control device of an oxygen-free and anaerobic process alternate operation type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention.

As shown in Fig. 2, first, an anoxic and anaerobic process alternating operation type membrane separation activated sludge device for simultaneous treatment of nitrogen and phosphorus to which the present invention is applied, and an anoxic / anaerobic alternating reactor type R1 of a front end as a reaction tank And an aerobic reaction tank (R2) to cause organic matter oxidation, nitrification reaction, and excessive intake of phosphorus in an aerobic state in which a downstream immersion membrane is installed and a blower is installed.

And, as a driver, ON / to return the nitrate nitrogen to the anoxic / anaerobic alternating reactor (R1) from the water agitator (A1) for stirring the anoxic / anaerobic alternating reactor type reaction tank and the aerobic reaction tank (R2) An internal transfer pump A2 capable of OFF control and a blower A3 capable of controlling a rotation speed for aeration of the call-based coagulation R2 are provided.

The anoxic / anaerobic alternating reactor R1 denitrates the conveyed nitrogen nitrate using organic matter in raw water F1 when there is a return flow F3 from the aerobic reaction tank R2 by a return pump. Anoxic conditions are formed in the reactor R1. And when the said conveyance flow F3 is stopped, it becomes anaerobic condition in which phosphorus discharge | release takes place using the organic substance in raw water F1. Meanwhile, in the aerobic reaction tank R2, oxygen is continuously supplied by the blower A3, and treated water F2 is continuously discharged through the membrane.

Unlike the conventional activated sludge method using the secondary settling tank, the aerobic reaction tank (R2) separates the sludge and the treated water through membrane separation, and the sludge of the aerobic reaction tank (R2) is returned as it is. At this time, the sludge concentration inside the aerobic reaction tank (R2) is maintained very high and can maintain a high solids residence time (SRT) is advantageous for nitrification. During operation, the sludge concentration in the anaerobic / anaerobic shift reactor (R1) is 8,000 mg / l, and the sludge concentration in the aerobic reactor (R2) is 10,000 mg / l. Surplus sludge (F4) is continuously discarded in small amounts in order to facilitate the uptake of aspiration in the aerobic reaction tank (R2).

The measurement control apparatus of the apparatus provided with such reaction tanks R1 and R2 and drivers A1, A2 and A3 is as follows.

As a measuring instrument, a redox potential measuring sensor S1 for measuring the redox potential ORP inside the anaerobic / anaerobic alternating reactor R1 is installed inside the anoxic / anaerobic alternating reactor R1. . In addition, a dissolved oxygen concentration (DO) measuring sensor (S2) for measuring the dissolved oxygen concentration (DO) in the aerobic reaction tank (R2) is installed inside the aerobic reaction tank (R2).

In addition, an inflow flowmeter (FM1) capable of measuring and controlling the inflow of the inflow water as a measurement and a controller is provided at one side of the flow path of the inflow water, and the return flow meter for measuring and controlling the internal transport flow of nitrate nitrogen ( FM2) is provided at one side of the conveying path, and an excess sludge flowmeter FM3 capable of measuring and controlling the sludge waste amount is provided at one side of the excess sludge disposal furnace.

PC (Personal computer) is a processor as a base control system electrically connected to the measuring device (S1, S2) or the measuring instrument and controller (FM1, FM2, FM3) and the internal transfer pump (A2) and the blower (A3) by wire or wirelessly. ) And digital / analog converters together.

That is, the PC C1, a system control device, monitors and stores data collected from each of the instruments S1 and S2 (or the measurement and controller FM1, FM2, and FM3) through the MMI (Man Machine Interface). Send the required output signal according to the algorithm. The output digital value is sent to the corresponding drivers A2 and A3 (or the measurement and controller FM1, FM2 and FM3) via the digital / analog converter C2 as analog values. On the other hand, the analog values measured and sent from the respective measuring instruments S1 and S2 (or the measuring and controller FM1, FM2 and FM3) are converted into digital values through the digital / analog converter C2 and then returned to the PC C1. It is input, and the output process is repeated.

The specific control process using such a measuring device is as follows.

First, the carrier ratio control (Step 1) in this invention is explained in full detail. Since the flow rate of inflow water varies with season and time, the return cost varies according to season and time when the internal return flow rate is set constant. The conveyance ratio affects the concentration of the effluent nitrate nitrogen, but when the conveyance ratio is low, the concentration of the effluent nitrate nitrogen is high, and when the conveyance ratio is high, the pump operation cost is required without increasing the efficiency. Therefore, in order to maintain the transport ratio optimally, it is preferable to control each flow rate such that the transport flow rate is a constant ratio according to the inflow flow rate, and in particular, it is preferable to control the transport ratio by a proportional control method using a proportional controller (installed in the PC).

Next, the conveyance time control (Step 2) in this invention is explained in full detail. Figure 3 is a flow chart showing the internal transfer pump measurement control of the anaerobic and anaerobic process alternating operation membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus according to the present invention.

As shown in FIG. 3, influent water is continuously injected into an anaerobic / anaerobic alternating reactor, and the value of the ORP measuring sensor is continuously output to the PC. At this time, if the value of ORP is less than -100 mV while the internal transport pump is in operation, continue to operate the internal transport pump and if the value of ORP exceeds -100 mV, the internal transport pump Stops operation. The higher the ORP value, the higher the amount of oxidized material. If the value is too high, the oxygen and nitrate nitrogen in the anaerobic / anaerobic alternating reactor is flown by the flow returned from the aerobic reactor. It means a higher concentration. Furthermore, if the dissolved oxygen concentration is high, the organic matter in the raw water is used to reduce oxygen and thus denitrification efficiency, so the redox potential should be controlled so as not to exceed -100 mV. On the other hand, when the return flow is stopped, anaerobic conditions are formed, and the reaction is performed until the redox potential (ORP) is lowered to -400 mV so that nitrate nitrogen can be completely denitrified and biological release can occur sufficiently. And, when the ORP value falls below -400 mV, the transfer pump is operated again to switch to anoxic conditions.

Next, blower control (Step 3) in this invention is explained in full detail. 4 is a flow chart showing blower measurement control of an anaerobic and anaerobic process alternating operation type membrane separation activated sludge method according to the present invention.

In an aerobic reactor, ammonia nitrogen is oxidized to nitrate nitrogen, and the minimum required dissolved oxygen concentration (DO) is 0.5 mg / l and the optimal dissolved oxygen concentration (DO) is 2.0 mg / l. Therefore, by using the Proportional-Integrate-Derivative (PID) controller (designed in the PC), the rotation speed of the blower is adjusted based on the current dissolved oxygen concentration (DO) value in a proportional-integral-derivative manner. Operate so that the dissolved oxygen concentration (DO) in the aerobic reactor does not drop below 2.0 mg / l. As such, the dissolved oxygen concentration (DO) concentration in the aerobic reaction tank affects the reaction inside the anaerobic / anaerobic shift type reactor in the section where the return pump operates, so that the dissolved oxygen concentration (DO) is 2.0 mg / l. Keep it at

On the other hand, when the operation stop time is measured by the operation type of the conveying pump, if the operation stop time is more than 1 minute and less than 10 minutes, the membrane is cleaned by maximizing the output of the blower for cleaning the membrane. That is, if the conveying pump continues to be stopped after about 1 minute after the operation of the conveying pump stops, the membrane is cleaned by maximizing the output of the blower, and about 10 minutes after the conveying pump stops operating. When the conveyance starts again, the blower is controlled to lower the dissolved oxygen concentration (DO) to an appropriate level so that the increased dissolved oxygen concentration (DO) value does not enter the anaerobic / anaerobic shift reactor.

Next, sludge waste volume control (Step 4) in this invention is explained in full detail. Sludge disposal is necessary to maintain the microbial concentration and solids retention time (SRT) properly in the reactor, which requires a long solids retention time (SRT) for nitrification and a short solids retention time (SRT) for phosphorus removal. This is required, and microbial disposal is continuously performed so that microorganisms with a long solid residence time (SRT) and microorganisms with a short solid residence time (SRT) can coexist. The sludge waste amount is determined by Equation 1 below.

[Equation 1]

Where FR is the sludge waste rate (m ³ / day), S _{anaerobic / anaerobic shift reactor} is the sludge concentration in the anaerobic / anaerobic shift reactor (kg / m ³ ), and S _{aerobic reactor} is the sludge concentration in the aerobic reactor (kg / m ³ ), V _{anaerobic / anaerobic reactor} is the volume of the anaerobic / anaerobic reactor (m ³ ), V aerobic reactor is the volume _of the aerobic reactor (m ³ ), and SRT _d is the set average solid residence time. (Solids Retention Time; SRT) (in days).

In determining the sludge waste flow rate, it is preferable that the average solid residence time (SRT), that is, the SRT _d in [Equation 1], is determined by operating the waste amount so as to be 20 days in both nitrification and phosphorus removal.

Although the present invention has been described in detail above with reference to the drawings, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and such modifications and variations are included in the appended claims. It is natural to belong.

As described above, according to the measurement control method and apparatus of the anoxic and anaerobic process alternating operation type membrane separation activated sludge process for the simultaneous treatment of nitrogen and phosphorus of the present invention, the return cost, the transfer time for the anaerobic and anaerobic process alternating operation, By measuring and controlling the operation of the blower for sludge waste, aeration and intermittent membrane cleaning, it is easy to operate, easy to maintain, maximizes processing efficiency and processing capacity, and can reduce operating costs. Achieve effect. In addition, since the return flow rate is controlled according to the inflow flow rate, the concentration of the effluent nitrate nitrogen can be properly maintained, and the sludge waste amount can be smoothly removed to adjust the sludge waste so that the appropriate solids residence time (SRT) is maintained. Furthermore, since the anaerobic / anaerobic reaction is controlled according to the internal state of the anaerobic / anaerobic alternating reactor through automatic measurement control, the concentration of nitrogen and phosphorus in the treated water can be reduced by efficiently using the organic matter in the influent. In addition, the automatic measurement control enables flexible operation without the driver having to adjust the reaction time arbitrarily according to the inflow water characteristics and concentration changes.In general, the operating cost of the blower accounts for 70% of the operation cost of the advanced processing method. By controlling the dissolved oxygen concentration (DO) in the aerobic tank, the excess power cost can also be reduced.

Claims (8)

An anaerobic process, (A) continuously introducing the sewage, sewage, or wastewater into the anoxic / anaerobic alternating reactor as an inflow source water; (B) operating an internal transfer pump that is operated intermittently to continuously transport internally the nitrate nitrogen generated in the aerobic reaction tank to make the anaerobic / anaerobic shift driving reactor anoxic; (C) converting the nitrate nitrogen supplied through the internal transport of step (b) into nitrogen gas by using the organic material in the continuously introduced inflow water as a carbon source; (D) flowing the denitrification-treated mixture in step (c) to the subsequent aerobic reaction tank; Under the aerobic conditions of the aerobic reaction tank with continuous aeration by a blower, the nitrification process for converting the organic nitrogen and ammonia nitrogen supplied from the influent by the nitrification microorganism into nitrate nitrogen and the organic matter oxidation process for decomposing the remaining organic matter are carried out. Step (e); And (f) continuously discharging the treated water using an immersion type membrane installed in the aerobic reaction tank. Anaerobic process, Introducing sewage, sewage, or wastewater into the anoxic / anaerobic alternating reactor with continuous inflow (a '); Stopping the operation of the internal transfer pump operating intermittently to stop the internal transport of nitrate nitrogen generated in the aerobic reaction tank to make the anaerobic / anaerobic shift driving reactor anaerobic (b '); (C ') releasing phosphorus to dephosphorus microorganisms by using organic materials in continuously introduced inflow water as a carbon source in an anaerobic state in which nitrate nitrogen is denitrated and depleted due to the stop of internal transport of step (b); (D ') flowing over the microorganisms having released phosphorus in the step (c') to an aerobic reaction tank followed; Under the aerobic conditions of the aerobic reaction tank with continuous aeration by the blower, the concentration of dissolved phosphorus in the aerobic reaction tank is reduced by the phosphorus excess intake of the phosphorus-releasing microorganism in the step (d '), and at the same time, the organic matter supplied from the influent by the nitrifying microorganism (E ') proceeding with the nitrification process for converting nitrogen and ammonia nitrogen to nitrate nitrogen and the organic matter oxidation process for decomposing the remaining organic matter; Continuously discharging the treated water from which phosphorus has been removed using an immersion membrane installed in the aerobic reaction tank (f '); And discharging the sludge in a state in which the phosphorus in the step (e ') is excessively ingested to discharge the phosphorus (g'), The anaerobic process and the anaerobic process in the anoxic / anaerobic shift type reaction tank are divided according to the presence or absence of the internal transport of nitrate nitrogen by an internal transfer pump, and the anoxic process for removing nitrogen and the release of phosphorus for the removal of nitrogen. As a measurement control method of the sewage and wastewater advanced treatment method for simultaneously treating nitrogen and phosphorus in which anaerobic processes are alternately performed, A conveyance ratio control step (S1) of maintaining a ratio of the internal conveyance flow rate of the nitrate nitrogen to the inflow flow rate of the inflowing raw water; A transfer time control step (S2) of continuously measuring a redox potential (ORP) value in the anaerobic / anaerobic alternating operation reactor and determining whether to operate the internal transfer pump in response to the measured value; Blower control step (S3) of continuously measuring the dissolved oxygen concentration (DO) in the aerobic reaction tank when the internal transfer pump is operating and adjusting the rotational speed of the blower to maintain a constant level of the dissolved oxygen concentration (DO) ); And At the time of the sludge disposal, the sludge waste amount control step (S4) to determine the sludge waste amount according to the following [Equation 1]; and the aerobic and anaerobic process alternate operation for the simultaneous treatment of nitrogen and phosphorus, characterized in that it comprises a METHOD CONTROL METHOD OF TYPE Membrane Separation Activated Sludge Process. [Equation 1]

Where FR is the sludge waste rate (m ³ / day), S _{anaerobic / anaerobic shift reactor} is the sludge concentration in the anaerobic / anaerobic shift reactor (kg / m ³ ), and S _{aerobic reactor} is the sludge concentration in the aerobic reactor (kg / m ³ ), V _{anaerobic / anaerobic reactor} is the volume of anoxic / anaerobic reactor (m ³ ), V _{aerobic reactor} is the volume of aerobic reactor (m ³ ), and SRT _d is the set average solid residence time ( Solids Retention Time (SRT) (in days). The method of claim 1, wherein the step S1, Control method of anoxic and anaerobic alternating operation type membrane separation activated sludge process for simultaneous treatment of nitrogen and phosphorus, characterized by controlling the ratio of the internal transport flow rate of nitrate nitrogen to the inflow of influent raw water through a proportional controller . The method of claim 1, wherein the step S2, While the internal transfer pump is operating, the redox potential (ORP) in the anoxic / anaerobic alternating reactor is continuously measured to continuously measure the internal transfer pump when the ORP value is -100 mV or less. Stop the operation of the internal transfer pump when the ORP value exceeds -100 mV, and in the state where the internal transfer pump is not operated, the redox in the anoxic / anaerobic alternating reactor. Anoxic and anaerobic process alternating membrane for simultaneous treatment of nitrogen and phosphorus, characterized in that the internal transfer pump is operated when the ORP value is continuously measured and the redox potential is less than -400 mV. Instrumentation control method of separation activated sludge method. The method of claim 1, wherein the step S3, When the internal transfer pump is not operating, the process of cleaning the membrane to maximize the rotational speed of the blower for a predetermined period of time characterized in that the process for operating an oxygen-free and anaerobic process alternate separation membrane separation sludge for nitrogen and phosphorus treatment Method of measurement control of construction method. The method of claim 4, wherein the step S3, In the state where the internal transfer pump is operating, the rotational speed of the blower is adjusted so that the dissolved oxygen concentration (DO) in the aerobic reaction tank is not less than 2.0 mg / l, and the internal transfer pump is not operated. By measuring the operation stop time of the internal transfer pump, if the operation stop time is more than 1 minute and less than 10 minutes, the oxygen-free and anaerobic process alternately for simultaneous treatment of nitrogen and phosphorus, characterized in that the membrane is cleaned by maximizing the rotational speed of the blower. MEASURING CONTROL METHOD OF DRIVING MEMBRANE ACTIVE SLUDGE PROCESS The method of claim 1, wherein the step S4, When the sludge waste amount is determined, the SRT _d of [Equation 1] is set to 20 days. Control method of anoxic and anaerobic process alternating type membrane separation activated sludge process for simultaneous treatment of nitrogen and phosphorus. An anaerobic / anaerobic alternating reactor equipped with a stirrer to continuously introduce inflow water of sewage, sewage, or wastewater; An aerobic reactor equipped with a blower to cause organic matter oxidation, nitrification reaction, and excessive intake of phosphorus in an aerobic state; An internal transfer pump for returning nitrate nitrogen generated from the aerobic reaction tank to the anoxic / anaerobic alternating operation reactor; And an immersion type membrane mounted in the aerobic reaction tank for continuously discharging the treated water through membrane filtration, The anoxic process and the anaerobic process in the anoxic / anaerobic alternating reactor may be classified according to the presence or absence of the internal transport of nitrate nitrogen by the internal transfer pump, and the anoxic process for removing nitrogen and release of phosphorus. As a measurement control device for the operation of the sewage and wastewater advanced processing apparatus for simultaneously treating nitrogen and phosphorus in which anaerobic processes are alternately performed, A redox potential sensor for measuring an redox potential (ORP) in the anaerobic / anaerobic alternating reactor; Dissolved oxygen concentration (DO) sensor for measuring the dissolved oxygen concentration (DO) in the aerobic reaction tank; An inflow flow meter for measuring and controlling the flow rate of the inflowing raw water; A conveying flow meter for measuring and controlling the inner conveying flow rate; Excess sludge flowmeter for measuring and controlling the amount of waste sludge discharged from the aerobic reaction tank; And Anoxic and anaerobic process alternating for simultaneous processing of nitrogen and phosphorus, comprising: a processor for controlling the internal conveying pump, the blower, and the respective flowmeters in response to measured value information input from the sensors and flowmeters Instrumentation control device of driving membrane separation activated sludge method. The method of claim 7, wherein the processor, Simultaneous nitrogen and phosphorus comprising a digital input / output computer and an analog / digital converter (A / D converter) for converting and outputting the digital signal to an analog signal and converting the input analog signal into a digital signal. Instrument for control of anaerobic and anaerobic process alternating membrane separation activated sludge process for treatment.

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