ni casestudy cs 15816

8/11/2019 NI CaseStudy Cs 15816

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Real-Time Monitoring of pH and Water Levels and Automation of Chlorine Control in Sewage Treatment Usi

CompactRIO and LabVIEW

Author(s):

Cherie DY J. Arao - Adamson University

Perdi L. Barbadillo - Adamson University

Nelson JR. G. Biscocho - Adamson UniversityKrizzel M. Silapan - Adamson University

Ardinne E. Sugian - Adamson University

The sustainability of available water resources and treatment of wastewater are a global concern. The cleanliness of surface water is most important in ensuring sustainable use.

Water is used for agriculture, industry, and domestic consumption; therefore efficient use and water monitoring are potential constraints for home, office, or industrial water

management system.

The Adamson University sewage treatment plant (STP) treats wastewater to comply with different republic acts and department orders set forth by the government. These laws

involve wastewater treatment and other bodies of water, specifically the Philippine Clean Water Act of 2004, the Toxic Substances and Hazardous and Nuclear Wastes Control Act of

1990, and the DENR Administrative Order Nos. 34 and 35. Initially, the STP is manually monitored with random pH level testing. This is important because wastewater must be

precisely and correctly treated for proper use.

The STP releases used water to monitor and treat. We keep thlae water clean and free from contaminants to ensure product quality and acceptable exposure levels through

treatment. We need to collect samples, monitor them, and test the pH levels to remove and eliminate storage risks and any additional toxic chemicals it contains. Because a portion

of this water is partially reused among toilets, this procedure must be dependable and accurate.

Proper monitoring of wastewater treatment in the STP ensures water sustainability linked to sensing and automation.

Study Background

The law of conservation of mass states that matter is neither created nor destroyed. When water is produced and disposed, waste does not disappear it has to go somewhere.

The STP reduces the total amount of waste water disposed, and then a portion of the treated water is reused.

The Philippine Clean Water Act of 2004 (RA 9275) aims to improve water quality, regulate and manage water pollution, design water quality management areas, and prepare a

national sewerage and septage management program. This act, which is designed to protect Philippine water bodies from pollutions created by different sources suggests a variety

of ways to manage the pollution that affects the countrys water.

Electronic engineering students at Adamson University took on this project when they learned about the declining quality of fresh water sources due to pollution that leads to a

shortage in the freshwater supply. To help with waste water treatment, our proposal assists with STP monitoring for the continuous supply of treated wastewater.

Hardware Setup

The NI cRIO-9073 is the main controller of the system (see Figure 1). The NI 9474 and NI 9203 C Series modules directly connect to the controller to acquire pH and water levels,

respectively. The servo motor automates the control and/or flow of chlorine when needed. A pH transmitter provides a standard 4 mA to 20 mA current output proportional to the pH

measured. The two pH sensors and two water-level sensors detect according to the set algorithm of programs, and then the computer displays the results..

Program Development

At the start of the process, the pH and water level sensors in the tank, come in contact with the sewage treatment water to detect whether it is an acid, base, or neutral and identify

the water level. The system distinguishes treated water with a pH level higher than nine as base, pH lower than six as acid, and an obtained pH value equal to seven as neutral. If the

water level of the tank, does not reach the specific critica l level, the system goes back to start and senses the water level. However, when the water level reaches its maximum

amount, it may overflow and activates the alarm in the server. The pH and water level detection, is communicated to the CompactRIO control ler and its modules, which transmit the

data to the servers PC via Ethernet cable. See Figure 2 for the system flow chart.

Measurement Matrix

Tables 1, 2, and 3 are the matrices of the STP measurement system. A particular ampere reading is equivalent to the same pH level as water level except that it is expressed in feet

and percentages depending on the volume of the tank. We used this matrix throughout system development.

Final Testing

Trial 2 of the final pH testing in equalization and clean water tanks showed great improvement (see Table 4). One sample was equivalent to 5 seconds of deployment in the system.

The table displays the results of pH and water level and indicates if the alarm was triggered. A pH level of 6 to -9 was acceptable per DO recommendations. The water level

increased and the pressure sensor could still measure it. The external chlorine tank showed no significant changes at 100 percent full.

"With a system based on CompactRIO and LabVIEW, the Adamson

University sewage treatment plant now has a solution that closely

monitors the pH and water level of the equalization and clean water

tanks in real-time without having to take samples to analyze in alaboratory outside the university."- Cherie DY J. Arao, Adamson University

The Challenge:

Designing a system for Adamson Universitys sewage treatment plant (STP) to automate chlorine control and monitor the pH and

water level for equalization and clean water tanks in real time.

The Solution:

Using NI CompactRIO along with NI DAQ hardware programmed with NI LabVIEW and the LabVIEW Real-Time Module to

automate and monitor the STP.

Figure 1. System Block Diagram of Real-Time

Monitoring of pH and Water Level and Automation

of Chlorine Control.


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Measurement may be the same in pH and water level but different in current reading. Water level reading percentage changes based on matrix of measurement. We now can control

the chlorine tank in the office with the servo motor.

Remote, Rugged Monitoring

With a system based on nd , the Adamson University sewage treatment plant now has solution that closely monitor the pH and water level of the equalizationCompactRIO a LabVIEW

and clean water tanks in real-time without having to take samples to analyze in a laboratory outside the university. The chlorine tank is automated for complete monitoring and

treatment, and the system generates data- logging reports for tracking.

The integrated system with a real-time processor suited the demands of our STP project. With its ruggedness, it can stand inevitable weather conditions at the site of thecRIO-9073

project. With the built-in Ethernet port, it can communicate via the network from the site to the base station.

We used the C Series DAQ module with eight analog current input channels as the main frame for the pH and water level sensors of the system. The moduleNI 9203 NI 9474

directly connected to a variety of industrial devices such as the servo motor the system.

We used LabVIEW to develop complicated VIs for the project. The enhances the system by helping us set up real-time targets to build, debug, andLabVIEW Real-Time Module

deploy real-time applications.

Author Information:

Cherie DY J. Arao

Adamson University

900 San Marcelino St., Ermita, Manila

1000

Philippines

Tel: 639153532395

[email protected]

Figure 1. System Block Diagram of Real-Time Monitoring of pH and Water Level and Automation of Chlorine Control.
http://www.ni.com/compactrio/http://www.ni.com/labview/http://sine.ni.com/nips/cds/view/p/lang/en/nid/205621http://sine.ni.com/nips/cds/view/p/lang/en/nid/205621http://sine.ni.com/nips/cds/view/p/lang/en/nid/208805http://sine.ni.com/nips/cds/view/p/lang/en/nid/208823http://sine.ni.com/nips/cds/view/p/lang/en/nid/209855http://sine.ni.com/nips/cds/view/p/lang/en/nid/209855http://sine.ni.com/nips/cds/view/p/lang/en/nid/208823http://sine.ni.com/nips/cds/view/p/lang/en/nid/208805http://sine.ni.com/nips/cds/view/p/lang/en/nid/205621http://www.ni.com/labview/http://www.ni.com/compactrio/


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Figure 2. Flowchart of System Software.


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Table 1. Matrix of Measurement of Corresponding pH Level With Respect to Current and Interpretation


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Table 2. Matrix of Measurement of Corresponding Water Level With Respect to Current Percentage at 5 Feet


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Table 3. Matrix of Measurement of Corresponding Water Level With Respect to Current and Percentage at 35 Feet

Table 4. Data Results for the Final Testing of Sensors at STP


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Table 5. Data Log


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Figure 3. Project Site, Side 1


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Figure 4. Equalization Tank With pH Probe and Transmitter Installed

Figure 5. pH Transmitter at Equalization Tank


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Figure 6. pH Transmitter in Clean Water Tank


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Figure 7. pH and Water Level Sensor Installed

Figure 8. Chlorine Tank With Servo Motor Installed


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Figure 9. Servo Motor Installed at Knob of Tank to Control Flow


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Figure 10. Central Processing Unit


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Figure 11. Project Site: Side 2


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Figure 12. Final VI. Composed of Sub-VIs to Complete Process


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Figure 13. User Interface

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