KR100446250B1 - Control apparatus for sewage and wastewater equipment - Google Patents

Abstract

The present invention relates to a technique for improving the control performance of small and medium-sized sewage and wastewater treatment facilities and enabling remote control via the Internet. The present invention is a sewage treatment facility (1) for removing various contaminants contained in the incoming sewage and waste water below a predetermined level; A PLC device 2 for applying an expert control system to perform an abnormal diagnosis and control function for the sewage treatment facility 1 based on the expertise and experience of an experienced operator; It is located in the sewage treatment plant so that the real-time field data of the sewage treatment facility 1 can be monitored and monitored from the PLC device 2, and the expert control system is applied to the expertise and empirical knowledge of the skilled operators. PC (3) to perform the abnormal diagnosis and control function based on; Receive real-time on-site data of the sewage treatment facility 1 through the PLC device 2 and transmit it to the remote manager PC 6A, 6B, 6C through the high-speed Internet (5). An internet data center 4; Receive real-time on-site data of the sewage treatment facility 1 through the Internet (5) and the web and display the operation status of the site at a remote location as a video, and feed back the control value when an abnormality is found in the operation mode or operation mode or condition Is achieved by the remote manager PCs 6A, 6B, and 6C.

Description

CONTROL APPARATUS FOR SEWAGE AND WASTEWATER EQUIPMENT}

The present invention relates to a technology for improving the control performance of small and medium-sized sewage and wastewater treatment facilities and enabling remote control through the Internet, and in particular, by applying a professional control system to the sewage and wastewater treatment facilities. The present invention relates to a control device of a sewage and wastewater treatment facility that enables to exhibit control levels at a manufacturer level and to be monitored and controlled remotely through a web-based network.

In general, when looking at the actual operation and operation of environmental foundations such as sewage and wastewater treatment facilities, there are many complaints due to false recognition, which is regarded as 3D facilities, and frequent operation of field operators, stability of operation and operation There are many technical difficulties, such as deterioration of efficiency, lack of proper design and lack of standard work management system.

As such, the sewage and wastewater treatment facilities according to the prior art must be operated by operators in the field, resulting in a problem of deterioration in safety and efficiency due to inexperienced operation of operators. It was impossible to take proper measures in case of abnormality.

Accordingly, an object of the present invention is to apply a professional control system to the sewage and wastewater treatment facilities to automatically exhibit a skilled operator-level control performance, and to monitor and control remotely through a web-based network. To provide a control device for wastewater treatment facilities.

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of the control apparatus of the sewage and wastewater treatment facility by this invention.

Figure 2 is a schematic diagram of the sewage treatment plant facilities to which the present invention is applied.

Figure 3 is an illustration of an expert control program of the sewage and wastewater treatment process according to the present invention.

4 is a table showing necessary data and equipment signals for each operation.

Figure 5 is an exemplary view of mode selection according to the influent COD value.

Figure 6 is a table for setting aerobic / anaerobic time and reactor DO value for each mode.

7 is a signal flow diagram illustrating a process for determining aerobic time in a reaction vessel and determining malfunction of the instrument.

8 is a table for determining a change in signal of the exhalation.

9 is an exemplary diagram of a main homepage screen using a web browser.

10A-10C are exemplary views of a driving mode screen for DO, MLSS, and PH control.

Figure 11 is an illustration of an integrated operations center according to the present invention.

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

1: Sewage treatment plant 2: PLC device

3: PC 4: Internet Data Center

5: Internet 6A-6C: PC for remote administrator

1 is an overall block diagram of a control apparatus of a sewage and wastewater treatment facility according to the present invention. As shown in FIG. 1, a sewage treatment facility for removing various contaminants contained in an incoming sewage and wastewater below a predetermined level ( 1) and; A PLC device 2 for applying an expert control system to perform an abnormal diagnosis and control function for the sewage treatment facility 1 based on the expertise and experience of an experienced operator; It is located in the sewage treatment plant so that the real-time field data of the sewage treatment facility 1 can be monitored and monitored from the PLC device 2, and the expert control system is applied to the expertise and empirical knowledge of the skilled operators. PC (3) to perform the abnormal diagnosis and control function based on; Receive real-time on-site data of the sewage treatment facility 1 through the PLC device 2 and transmit it to the remote manager PC 6A, 6B, 6C through the high-speed Internet (5). An internet data center 4; Receive real-time on-site data of the sewage treatment facility 1 through the Internet (5) and the web and display the operation status of the site at a remote location as a video, and feed back the control value when an abnormality is found in the operation mode or operation mode or condition It is composed of PCs (6A), (6B), (6C) for the remote administrator to change the, it will be described in detail with reference to Figures 2 to 11 attached to the operation of the present invention configured as described above as follows. .

In order to monitor and manage the inflow and outflow characteristics of the sewage treatment facility (1), each fille system (9A) and (9B) was installed at the inlet and outlet. Collected and measured representative water quality items (COD, SS, pH, turbidity, CID, etc.), and transmits the results to the PC (3) and the Internet data center (4) in real time through the PLC device (2).

In other words, the Filleco system (9A), (9B) is a real-time remote water quality measurement and unmanned automatic sample collection integrated equipment to automatically collect a sample to secure evidence when the pollutant is discharged above the regulated concentration, COD, Measure four items: SS, pH, and EC. In general, when evaluating the measured data after the installation of the sewage treatment plant 1, the measured data of pH and EC can obtain relatively stable results, while the COD and SS should be measured by UV. Corrective work should be performed on the basis of this to reduce errors in the measured data.

In the aeration method, one multimeter and six measuring sensors are separately provided in the sensor sections 8A and 8A. DO, ORP sensors are installed at the inlet, MLSS, TEMP sensors are installed at the center, and DO, ORP, pH sensors are installed at the outlet. The values detected by the sensor units 8A, 8B are displayed on the monitor of the PC 3 via the PLC device 2, and on the other hand, are transmitted to the Internet data center 4 side.

However, in the present invention, an expert control system for operation support was installed at the site of the sewage treatment facility 1 to monitor and diagnose various types of instrument abnormalities and problems and take appropriate control measures. That is, by applying an expert control system, which is one of the fields of Artificial Intelligence, based on the expertise and experience of experienced operators, an abnormal diagnosis and control algorithm is created and applied to the PLC device (2). Built.

Since deriving the optimal condition of anaerobic / aerobic time is the most important point in the process operation by intermittent aeration method, the expert is controlled to maintain the optimal anaerobic / aerobic time according to the influent characteristics and to implement the rules. A control system was built.

Figure 3 shows an exemplary control program of the sewage and wastewater treatment process according to the present invention, the time of one cycle is 240 minutes.

Figure 4 shows the data of the sensor and the signal of the instrument required when executing the program for each sewage and wastewater treatment process.

The treatment method of the sewage treatment plant to which the present invention is applied treats nitrogen and phosphorus in sewage by introducing the concept of aerobic solid residence time so as to secure sufficient nitrification and dedusting time by repeating aerobic and anaerobic conditions in a single reactor. It is an improved method. At this time, in order to repeatedly maintain the aerobic and anaerobic conditions in the reaction tank to run or stop the air pressure blower, it is controlled by measuring the dissolved oxygen.

In the method to which the present invention is applied, the setting of the time of the intermittent aeration is determined according to the property of the influent. DO changes according to inflow load and microbial activity that change with time, and the oxygen transfer rate does not remain constant, so the dynamic properties of DO change continuously with time. Therefore, the DO concentration should be maintained at an appropriate level so that the microorganisms suitable for the wastewater to be treated can grow well. Maintaining the appropriate DO concentration is very important in terms of cost reduction because most of the power in the activated sludge process is occupied by a motor, a pump, and a blower for DO supply.

In the treatment plant to which the present invention is applied, it is difficult for the inflow of the influent to change as much as the inflow of wastewater due to the inflow of sewage. FIG. 5 shows the operation mode of the intermittent aeration based on the COD values of the fille system 9A and 9B, and selects the first mode (Mode 1) when the COD value of the influent is less than 30 ppm. To operate. In addition, even in the first mode (mode 1) and the second mode (mode 2), even if the same concentration, because of the difference in the flow rate over time was set to the difference of the operation mode. Since the daily change of wastewater flow from the industrial area and the daily change of general sewage are different, the time of aeration was set for 30 minutes from the evening (16:00) even at the same concentration.

The following is the production rule expressed in IF ~ THEN.

* Inflow COD Judgment Mode

Influent COD data = CODin

IF 30 ≤ CODin ≤ 50 THEN Mode 1 (04:00 ~ 16:00)

IF 30 〈CODin ≤ 50 THEN Mode 2 (16:00 ~ 04:00)

IF 50 〈CODin ≤ 70 THEN Mode 3

IF 70 〈CODIN THEN Mode 4

IF CODin 〈30 THEN Alarm: Sensor Check and Repair → Mode 1 Operation

* Determination of DO value and aerobic and anaerobic time

Mode 1 → blower on ⇒ 90 minutes

blower off ⇒ 150 minutes

DO setpoint D _O = 2 mg / l

Mode 2 → blower on ⇒ 120 minutes

blower off ⇒ 120 minutes

DO setpoint D _O = 2 mg / l

Mode 3 → blower on ⇒ 120 minutes

blower off ⇒ 120 minutes

DO setpoint D _O = 3 mg / l

Mode 4 → blower on ⇒ 120 minutes

blower off ⇒ 120 minutes

DO setpoint D _O = 4 mg / l

Figure 6 shows the set time of the exhalation / anaerobic setting time and the DO value of the reactor for each mode, it can be seen that the higher the acquisition properties, the higher the set time of the exhalation and the DO value.

Blowing time control is for optimally maintaining the DO required for activated sludge to oxidize and adsorb soluble and suspended organic materials to form sedimentable flocs.

The purpose of blowing is to provide ① power for floc formation (microorganism, ie activated sludge mass), ② power for preventing sludge sedimentation, and ③ mixing oxygen, organic matter and microorganisms. In the present invention, the DO in the aeration tank is measured and the blowing time is controlled in response to the deviation between the value and the target value. FIG. 7 shows a control process for determining a reaction tank blowing time and determining a malfunction of the instrument when the aerobic / anaerobic time and the reactor DO set value are determined according to the respective modes.

About 60 minutes after the start of the aerobic time in the reactor, the set DO value was changed by comparing the increase in DO value, and a control rule was developed to cope with the influent concentration by increasing and decreasing the blow time of the blower. That is, for 60 minutes, the DO value and the set DO value of the reactor are compared and judged to change the DO set value and the blowing time to maintain the DO value (control target level) of the reactor. Even if the set ratio of aerobic and anaerobic time was 2 hr / 2 hr, the control logic was configured to variably change the operating time by analyzing the maintenance of DO value in the reactor to obtain stable treatment water quality. In addition, through the comparison of DO and ORP values, the malfunction of the instruments (sensors) was identified and the rules for controlling the blowers were simultaneously written.

The following is the production rule of IF ~ THEN.

Instrument malfunction

0 min data: DO = D ₁ ORP = O ₁

60 min data: DO = D ₂ ORP = O ₂

THEN normal mode (maintain the determined mode)

Else: ① Instrument malfunction alarm → Rule # 1 (Sensor inspection and repair)

② Normal mode (Keep determined mode)

Determination of change in expiration time

DO setpoint by influent = D ₀

IF D ₂ ≥ D ₀ THEN Rule # 2 (Normal operation: Keep selected mode)

else: Rule # 3 → Figure 8

On the other hand, the Internet data center (4) receives the real-time field data from the sewage treatment facility (1) through the PLC device (2) for the remote administrator PC (6A) through the high-speed Internet (5) To (6B) and (6C). Therefore, the remote manager can not only check the operation status of the site at a remote location with a video, but also change the operation mode or condition by feeding back control values when an abnormality is found in operation.

In other words, it is possible to control the abnormal situation easily by installing the Internet data center (4) for remote management of the environmental basic facilities and remotely controlling the abnormal situation according to the professional control program installed in the remote monitoring control system. You can easily receive data on the web at any time, and you can receive yearly, monthly, weekly and daily environmental status reports on the Internet in the form of web documents and e-mail. In addition, the manager can receive the analysis data of the load change through the Internet, and can immediately check whether there is an abnormality in the site and automatically or manually perform the proper operation instruction according to the professional control program.

9 illustrates a screen of a main homepage by accessing a web server using a web browser according to the present invention. The homepage is in charge of process management, storage of measured data, video surveillance, manager registration, major process flow chart, and manager's log.In process management, real-time communication of measured data on site enables data flow and trend. The measured data can be used to monitor, diagnose and control abnormal operation and abnormalities and problems of the instrument during normal operation and take appropriate measures.

10A to 10C are diagrams illustrating a screen configuration for controlling DO, MLSS, and PH through the PC for the remote administrator, in which an administrator may change a setting value. That is, the manager can monitor and confirm the sewage treatment plant at a long distance, and if necessary, change the set value and operation method on the Internet to maintain a smooth control state.

11 shows an enlarged application of the present invention in the future. Unmanned and automated management of existing sewage treatment plants can minimize management manpower, excluding unnecessary manpower, and realize non-employment of skilled workers who are difficult to deploy remotely in villages. In particular, as well as unmanned automatic control management of unit sewage treatment facilities scattered all over the country, it is possible to integrate the unit basic facilities and manage the Internet, thus establishing a nationwide facility management network with an inexpensive operation management system.

As described in detail above, the present invention applies an expert control system to a sewage and wastewater treatment facility to automatically exhibit a skilled operator-level control performance, and monitor and control remotely through a web-based network. By doing so, it is possible to operate the sewage and wastewater treatment facilities more stably and efficiently while using lower operating costs.

Claims (5)

A sewage treatment facility (1) for removing various contaminants contained in the introduced sewage and wastewater to a predetermined level or less; Based on the inflow COD concentration and inflow time of the wastewater entering the sewage treatment facility (1), the DO concentration required for the reaction of the microorganisms in the treatment plant is inferred, and the blower device is controlled in consideration of the DO concentration in the reactor and the ORP value The sewage treatment system is based on the expertise and experience of experienced operators by applying a professional control system that improves the quality of treatment water quality and power cost effect by configuring the logic to check the normal operation of the instrument through mutual comparison. A PLC device (2) for performing abnormal diagnosis and control functions for the facility (1); The implementation of the sewage treatment facility (1) from the PLC device (2) in the field to receive and monitor the data, and to apply the control system by applying the control system to perform the abnormal diagnosis and control functions (3); Receive real-time on-site data of the sewage treatment facility 1 through the PLC device 2 and transmit it to the remote manager PC 6A, 6B, 6C through the high-speed Internet (5). An internet data center 4; Receive real-time on-site data and load change analysis data of the sewage treatment facility (1) through the Internet (5) and the web to display the operation status of the site at a remote site as a video, and to find the abnormal situation in the operation to the remote manager A control device for sewage and wastewater treatment facilities, comprising PCs (6A), (6B), and (6C) for remote managers for feeding back control values to change operation modes or conditions. The sewage / wastewater according to claim 1, wherein the inlet and outlet are provided with a fillet system (9A) and (9B) for monitoring and managing the water quality of the influent and the discharged water in real time. Control device of processing equipment. delete delete According to claim 1, the Internet data center (4) is provided to the remote management PCs (6A), (6B), (6C) side through the Internet (5) and the web at the same time, yearly, monthly, weekly , The control device for sewage and wastewater treatment facilities, characterized in that configured to provide a daily environmental status report in the form of web documents and e-mail.