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Enhancing flexible fiber filter (3FM) performance using in-line coagulation.

J J Lee1, M K Jeong, J H Im

  • 1Department of Environmental Engineering, Pusan National University, Busan, Korea. herolee38@pusan.ac.kr

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|June 7, 2006
PubMed
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This study explores using flexible fiber filters for producing drinking water from surface water. Adding coagulants like polyaluminium chloride (PAC) significantly improved removal efficiency and filtration time.

Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Filtration Science

Background:

  • Tertiary wastewater treatment commonly uses deep bed filtration.
  • Flexible fiber filter packing has been developed for large-scale wastewater treatment.
  • Its application for producing drinking water from surface water requires investigation.

Purpose of the Study:

  • To assess the feasibility of flexible fiber filtration for drinking water production from surface water.
  • To enhance the removal efficiency of fiber filters using in-line coagulant injection.
  • To optimize filtration parameters for effective water treatment.

Main Methods:

  • Pilot-scale experiments were conducted using polyamide fiber filters with 93% bed porosity.
  • Nak-dong River water was treated with coagulants: alum, poly-styrene-sulfonate-maleic-anhydride (PSOM), and polyaluminium chloride (PAC).

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  • Coagulants were administered via an in-line injection method.

    • Main Results:

    • In-line coagulant injection, particularly low dosages (1-5 mg/L) of PAC and PSOM, increased filter removal efficiency.
    • 1 mg/L of PAC resulted in the longest filtration duration.
    • An optimal filtration velocity of 120 m/hr was determined based on filtration time, filtrate quality, and volume.
    • Long-term operation achieved a stable effluent quality of 0.4 NTU.

    Conclusions:

    • Flexible fiber filtration, enhanced with in-line coagulant injection, is a viable technology for producing drinking water from surface water.
    • Polyaluminium chloride (PAC) at 1 mg/L offers an effective balance between efficiency and filtration time.
    • Optimized filtration at 120 m/hr ensures consistent high-quality effluent suitable for drinking water standards.