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Algae separation from urban landscape water using a high density microbubble layer enhanced by micro-flocculation.

Shuwen Chen1, Jingcheng Xu1, Jia Liu1

  • 1Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, 200092 China

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|September 17, 2014
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Summary

High-density microbubble layers and micro-flocculation effectively remove algae from urban water. This method enhances water purification by reducing algae, chemical oxygen demand, nitrogen, and phosphorus.

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Area of Science:

  • Environmental Science
  • Water Treatment Engineering
  • Applied Chemistry

Background:

  • Eutrophication causes algal blooms, complicating conventional water treatment processes.
  • Urban landscape water sources are particularly susceptible to algal overgrowth.
  • Effective algae removal is crucial for water purification and ecosystem health.

Purpose of the Study:

  • To investigate the efficacy of high-density microbubble layers combined with micro-flocculation for algae removal.
  • To determine the optimal operational parameters for this combined treatment method.
  • To assess the impact of microbubble characteristics on treatment performance.

Main Methods:

  • Utilized a high-density microbubble layer system integrated with micro-flocculation.
  • Systematically varied parameters including pressure, hydraulic loading, microbubble layer height, and flocculation dosage.
  • Analyzed removal efficiencies for algae, chemical oxygen demand (COD), nitrogen, and phosphorus.

Main Results:

  • Achieved maximum removal efficiencies for algae, COD, nitrogen, and phosphorus under specific conditions: 0.42 MPa pressure, 5 m/h hydraulic loading, 4 mg/L flocculation dosage, and a 130 cm microbubble layer height.
  • Demonstrated that microbubble size, clearance distance, and concentration are influenced by applied pressure and microbubble layer height.
  • Identified optimal conditions for efficient algae separation and water purification.

Conclusions:

  • The combined microbubble layer and micro-flocculation technique offers a viable alternative for algae separation in urban landscape water.
  • This method significantly improves water quality by removing algae and associated pollutants.
  • The findings provide valuable insights for optimizing microbubble-based water treatment technologies.