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Related Experiment Videos

The vortex concentrator for suspended solids treatment.

J Lee1, K Bang, J Choi

  • 1Department of Environmental Engineering, Chongju National College of Science and Technology, Yonggang, Geosan, Chungbuk, 367-701, Korea. jlee@chongjunc.ac.kr

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 10, 2003
PubMed
Summary

Vortex concentrators effectively reduce suspended solids in stormwater, achieving 65-70% removal efficiency. Optimizing retention time and flow rates, along with a follow-up basin, further enhances treatment performance for cleaner water discharge.

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Wastewater Management

Background:

  • Combined sewer overflows and stormwater runoff contribute significant suspended solids (SS) to waterways.
  • Vortex concentrators are emerging as a popular technology for SS reduction in these scenarios.
  • Effective treatment is crucial for mitigating pollution and improving water quality.

Purpose of the Study:

  • To laboratory investigate the efficacy of vortex concentrators for reducing suspended solids in synthesized stormwater.
  • To evaluate the impact of varying influent SS concentrations on removal efficiency.
  • To determine optimal operational parameters and potential enhancements for vortex concentrator performance.

Main Methods:

  • Synthesized stormwater with sand, granular activated carbon, and sewer sediments was used.

Related Experiment Videos

  • Vortex concentrator tests were conducted with varying surface loading rates (120-850 m3/m2/day) and SS concentrations (300-5,000 mg/L).
  • Jar tests identified optimal coagulant (PAM at 2 mg/L) and settling tests assessed follow-up retention basin effectiveness.

    • Main Results:

    • The vortex concentrator achieved an overall SS removal efficiency of approximately 65% for typical stormwater.
    • Removal efficiency increased with higher influent SS concentrations, reaching 65-70% for concentrations above 1,000 mg/L.
    • Optimal retention time was found to be 0.15-1.0 minutes, and increased foul to overflow ratio also improved efficiency.

    Conclusions:

    • Vortex concentrators are effective for suspended solids reduction in stormwater, particularly at higher concentrations.
    • Operational parameters like retention time and flow ratios significantly influence treatment efficiency.
    • A follow-up retention basin with 5-10 minutes hydraulic retention time can substantially improve overall treatment outcomes.