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  • Volume 1, Issue 5-6

Impact of pretreatment on UF operation and removal of dissolved organics

A. Braghetta, M. Price, C. Hentz, E. Stevenson, C. Kolkhorst
Published June 2001, 1 (5-6) 331-339;
A. Braghetta
Montgomery Watson, 1340 Treat Blvd., Suite 300, Walnut Creek, CA USA, 925-933-2250
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M. Price
Montgomery Watson, 1340 Treat Blvd., Suite 300, Walnut Creek, CA USA, 925-933-2250
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C. Hentz
Montgomery Watson, 1340 Treat Blvd., Suite 300, Walnut Creek, CA USA, 925-933-2250
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E. Stevenson
Alameda County Water District, 43885 South Grimmer Blvd., Fremont, CA USA
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C. Kolkhorst
Montgomery Watson, 613 Northwest Loop 410, Suite 195, San Antonio, TX USA
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Abstract

Pilot testing of low-pressure membrane filtration (microfiltration and ultrafiltration) was performed on surface waters at two different pilot locations: the Alameda County Water District (ACWD) in Fremont, CA and the Medina River outside San Antonio, TX. Clarification pretreatment and adsorption pretreatment were evaluated at each site for impacts on operational membrane performance and on removal of dissolved organic compounds including total organic carbon (TOC), UV254, color and precursors to disinfection by-products. At the ACWD test site, studies were also conducted with spiking of taste and odor-causing compounds. In both pilot studies, clarification pretreatment was demonstrated to achieve some apparent improvement in operating efficiency. For example, an apparent increase in sustainable flux between 25% and 50% was demonstrated for clarified feedwater operation as compared to raw feedwater operation at the ACWD pilot site. Removal of dissolved organic compounds was achieved primarily through the pretreatment with clarification and/or addition of powdered activated carbon (PAC); however, some reduction of TOC and color was achieved via membrane filtration presumably due to removal of particulate/colloidal constituents.

  • Clarification
  • microfiltration
  • PAC adsorption
  • ultrafiltration
  • © IWA Publishing 2001

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Water Science and Technology: Water Supply: 18 (2)
  Volume 1, Issue 5-6

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Impact of pretreatment on UF operation and removal of dissolved organics
A. Braghetta, M. Price, C. Hentz, E. Stevenson, C. Kolkhorst
Water Science and Technology: Water Supply Jun 2001, 1 (5-6) 331-339;
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Impact of pretreatment on UF operation and removal of dissolved organics
A. Braghetta, M. Price, C. Hentz, E. Stevenson, C. Kolkhorst
Water Science and Technology: Water Supply Jun 2001, 1 (5-6) 331-339;

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Keywords

Clarification
microfiltration
PAC adsorption
ultrafiltration
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