Floating plastic media followed by hollow fiber microfiltration membrane was applied for surface water treatment. The performance of the system in terms of particle and microorganisms was investigated. The floating filter was examined at different filtration rates of 5, 10 and 15 m3/m2.h. Treated water was then fed into a microfiltration unit where different filtration rates were examined at 0.6, 1.0 and 1.4 m3/m2.d. It was found that polyaluminum chloride was the best coagulant for the removal of particle, algae and coliform bacteria. Average turbidity in treated water from the floating plastic media filter was 3.3, 12.2 and 15.5 NTU for raw water of 80 NTU and 12.9, 11.7 and 31.2 NTU for raw water of 160 NTU after 6 hours at the filtration rates of 5, 10 and 15 m3/m2.h, respectively. The microfiltration unit could further reduce the turbidity to 0.2–0.5 NTU with low transmembrane pressure development of 0.3–3.7 kPa. Microfiltration membrane could retain most of algae and coliform bacteria remaining in the effluent from the pretreatment unit. It was found that at higher turbidity, algae and coliform bacteria removal efficiencies were achieved at lower filtration rate of the system of 5 m3/m2.h whereas a higher filtration rate of 15 m3/m2.h yielded better coliphage removal.
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Research Article|
May 01 2005
Particle and microorganism removal in floating plastic media coupled with microfiltration membrane for surface water treatment
C. Chiemchaisri;
*Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Road, Bangkok 10900, Thailand
E-mail: [email protected]
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W. Chiemchaisri;
W. Chiemchaisri
*Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Road, Bangkok 10900, Thailand
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T. Kornboonraksa;
T. Kornboonraksa
*Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Road, Bangkok 10900, Thailand
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C. Dumrongsukit;
C. Dumrongsukit
*Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Road, Bangkok 10900, Thailand
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S. Threedeach;
S. Threedeach
*Department of Environmental Engineering, Kasetsart University, 50 Phaholyothin Road, Bangkok 10900, Thailand
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H. H. Ngo;
H. H. Ngo
**Infrastructure and the Environment Group, School of Civil Engineering, University of Technology, Sydney, NSW, Australia
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S. Vigneswaran
S. Vigneswaran
**Infrastructure and the Environment Group, School of Civil Engineering, University of Technology, Sydney, NSW, Australia
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Water Sci Technol (2005) 51 (10): 93–100.
Citation
C. Chiemchaisri, W. Chiemchaisri, T. Kornboonraksa, C. Dumrongsukit, S. Threedeach, H. H. Ngo, S. Vigneswaran; Particle and microorganism removal in floating plastic media coupled with microfiltration membrane for surface water treatment. Water Sci Technol 1 May 2005; 51 (10): 93–100. doi: https://doi.org/10.2166/wst.2005.0355
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