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Related Experiment Videos

Removal of algae by sonication-coagulation.

Guangming Zhang1, Bo Wang, Panyue Zhang

  • 1School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin, China. gmgwen@gmail.com

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|July 21, 2006
PubMed
Summary

Ultrasonic pretreatment significantly improves algae removal from drinking water sources. This ultrasound assisted coagulation method enhances efficiency and reduces coagulant dosage, offering a novel solution for water treatment works.

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Area of Science:

  • Environmental Science
  • Water Treatment Technology

Background:

  • Algae blooms in source water pose significant challenges to drinking water supplies.
  • Conventional treatment methods have limited success in removing algae cells effectively.

Purpose of the Study:

  • To investigate the efficacy of ultrasound assisted coagulation for removing algae cells.
  • To optimize sonication parameters for enhanced algae removal and reduced coagulant dosage.

Main Methods:

  • Applying ultrasonic irradiation as a pretreatment step before coagulation.
  • Evaluating the impact of sonication time, power, pH, and frequency on algae removal efficiency.
  • Measuring changes in turbidity and coagulant dose required for high removal ratios.

Main Results:

Related Experiment Videos

  • Ultrasonic pretreatment significantly enhanced algae cell removal efficiency.
  • A 5-second sonication increased removal efficiency by over 20% with a 0.4-0.8 mg/L coagulant dose.
  • Coagulant dose was reduced by two-thirds to achieve a 90% removal ratio with 5-second sonication.
  • Optimal parameters included 1-second sonication, 48 W power, and pH 8-9.
  • Ultrasonic pretreatment also led to a significant reduction in sample turbidity.

Conclusions:

  • Ultrasound assisted coagulation is an effective technology for removing algae from source water.
  • This method offers substantial reductions in coagulant usage and improves overall water treatment efficiency.
  • The findings provide a basis for implementing this advanced oxidation process in water treatment works to combat algae bloom issues.