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Floc characterisation by analysis of laser beam attenuation
M T Chambino1, A Correia, J Coelho
1Instituto Nacional de Engenharia e Tecnologia Industrial, Estrada do Paço do Lumiar, 1649-038 Lisboa, Portugal.
Environmental Technology
|September 17, 2004
Summary
A new photosedimentation method accurately characterizes water flocs using light beams and settling. This technique measures floc size and density, aiding water quality control and environmental pollution monitoring.
Area of Science:
- Environmental Science
- Analytical Chemistry
- Water Treatment Technology
Background:
- Increasing demand for quality water necessitates effective environmental pollution control.
- Monitoring particles in water and wastewater treatment is crucial for quality assurance.
- Development of advanced control devices for water quality monitoring is essential.
Purpose of the Study:
- To develop a novel photosedimentation method for floc characterization.
- To combine gravitational settling with photoelectric measurements for particle analysis.
- To establish a method for determining floc size and density.
Main Methods:
- Particles settling through a light beam are measured via light attenuation.
- Voltage/time signals from a detector system are analyzed.
- Calibration tests with different light sources and detectors were performed, followed by analysis of flocculated suspensions.
Main Results:
- The photosedimentation method determines particle size distribution based on light beam attenuation.
- Floc characteristics, including size and density, are derived from signal analysis.
- Floc properties were correlated with formation conditions like mixing and polymer concentration.
Conclusions:
- A prototype photosedimentation device was designed and implemented.
- The developed method is suitable for laboratory and field applications.
- This technique offers a valuable tool for water quality control and pollution monitoring.