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Leveraging Turbidity and Thromboelastography for Complementary Clot Characterization

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Turbidity control on dissolved air flotation process using fuzzy logic.

Rodolpho Rodrigues Fonseca¹, Ivan Carlos Franco², José Pedro Thompson³

¹Department of Chemical Engineering, Federal University of Sergipe, Marechal Rondon Avenue, São Cristóvão, SE, Brazil.

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|February 16, 2019

Summary

Fuzzy logic control improved clean water turbidity regulation in dissolved air flotation (DAF) processes. This advanced control strategy outperformed traditional methods, optimizing water recycling and reducing operational efforts.

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Area of Science:

Environmental Engineering
Process Control
Water Treatment Technologies

Background:

Dissolved air flotation (DAF) is crucial for water treatment.
Controlling turbidity in DAF processes is essential for clean water production.
Traditional PID controllers may have limitations in complex DAF operations.

Purpose of the Study:

To explore fuzzy logic control for clean water turbidity in DAF.
To compare fuzzy logic control with traditional PID strategies.
To optimize actuator control effort and water recycling.

Main Methods:

Implemented three control strategies: SISO I (Saturator Pressure MV), SISO II (Recycle Stream Valve MV), and MISO (Fuzzy Logic Control).
Evaluated performance using Integral Absolute Error (IAE) and actuator control efforts (ECV01, ECV02).
Focused on manipulating saturator vessel flow output for turbidity regulation.

Main Results:

Recycle stream valve opening proved a better manipulated variable than saturator pressure for DAF turbidity control.
Both SISO II and MISO strategies effectively regulated the process variable.
MISO fuzzy logic control reduced IAE by 11.24% compared to SISO II, despite higher valve control effort.

Conclusions:

Fuzzy logic control offers superior performance for clean water turbidity regulation in DAF systems.
The MISO fuzzy logic approach enhances process control efficiency.
This method prevents excessive clean water use in recycling streams.