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Impacts of salt type and concentration on coagulation of humic acid and silica

2013; UWA Publishing; Volume: 62; Issue: 6 Linguagem: Inglês

10.2166/aqua.2013.141

1365-2087

Orren D. Schneider, Lauren Weinrich, Eugenio Giraldo, Mark W. LeChevallier,

Wastewater Treatment and Nitrogen Removal

Research Article| September 01 2013 Impacts of salt type and concentration on coagulation of humic acid and silica Orren D. Schneider; Orren D. Schneider 1American Water, 1025 Laurel Oak Rd, Voorhees, NJ 08043, USA E-mail: orren.schneider@amwater.com Search for other works by this author on: This Site PubMed Google Scholar Lauren A. Weinrich; Lauren A. Weinrich 2American Water, 213 Carriage Lane, Delran, NJ 08075, USA Search for other works by this author on: This Site PubMed Google Scholar Eugenio Giraldo; Eugenio Giraldo 3Natural Systems Utilities, 2 Clerico Lane, Hillsborough, NJ 08844, USA Search for other works by this author on: This Site PubMed Google Scholar Mark W. LeChevallier Mark W. LeChevallier 1American Water, 1025 Laurel Oak Rd, Voorhees, NJ 08043, USA Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2013) 62 (6): 339–349. https://doi.org/10.2166/aqua.2013.141 Article history Received: December 04 2012 Accepted: June 07 2013 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search Citation Orren D. Schneider, Lauren A. Weinrich, Eugenio Giraldo, Mark W. LeChevallier; Impacts of salt type and concentration on coagulation of humic acid and silica. Journal of Water Supply: Research and Technology-Aqua 1 September 2013; 62 (6): 339–349. doi: https://doi.org/10.2166/aqua.2013.141 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Zeta potential distributions of model waters containing silica, humic acid, and differing ionic composition were evaluated. These distributions showed that under high ionic strength and in the presence of divalent cations, positive colloids exist in suspension with neutral and negative colloids. Positive colloids do not form at lower ionic strength or when polyvalent cations are absent. The existence of the positive colloids in suspension with the negative colloids suggests that, while electrodynamically unstable, some stabilizing factor is preventing coagulation. This stabilizing factor is likely adsorbed humic acid causing steric hindrance. Further tests indicated that under the conditions that lead to the existence of positive colloids, removal of humic acid by ferric chloride coagulation is diminished as compared to coagulation in lower ionic strength water or water containing just sodium chloride as the ionic matrix. As positively calcium–humic complexes can increase fouling of desalting membranes through the formation of densely packed fouling layers, understanding the mechanisms of coagulation in high ionic strength waters is crucial to improving performance of desalination operations. coagulation, desalination, organic matter, water treatment, zeta potential This content is only available as a PDF. © Water Research Foundation 2013 You do not currently have access to this content.