Combined natural organic and synthetic inorganic coagulants for surface water treatment

Abstract

Research Article| June 01 2009 Combined natural organic and synthetic inorganic coagulants for surface water treatment Kebreab Ghebremichael; Kebreab Ghebremichael 1UNESCO-IHE- Institute for Water Education, Wesetvest 7, PO Box 3015, Delft 2601, DA, The Netherlands Tel + 31 15 2151772 Fax: +31 15 2122921; E-mail: k.ghebremichael@unesco-ihe.org; www.unesco-ihe.org Search for other works by this author on: This Site PubMed Google Scholar Juliet Abaliwano; Juliet Abaliwano 1UNESCO-IHE- Institute for Water Education, Wesetvest 7, PO Box 3015, Delft 2601, DA, The Netherlands Search for other works by this author on: This Site PubMed Google Scholar Gary Amy Gary Amy 1UNESCO-IHE- Institute for Water Education, Wesetvest 7, PO Box 3015, Delft 2601, DA, The Netherlands*Also at: Technical University of Delft, Stevinweg 1, 2628CN, Delft, The Netherlands Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2009) 58 (4): 267–276. https://doi.org/10.2166/aqua.2009.060 Article history Received: August 01 2008 Accepted: December 20 2008 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 Kebreab Ghebremichael, Juliet Abaliwano, Gary Amy; Combined natural organic and synthetic inorganic coagulants for surface water treatment. Journal of Water Supply: Research and Technology-Aqua 1 June 2009; 58 (4): 267–276. doi: https://doi.org/10.2166/aqua.2009.060 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex The purified coagulant from Moringa oleifera obtained by simple ion exchange purification was used for the removal of turbidity, dissolved organic carbon (DOC) and bacteria from surface water. The natural coagulant was used as a primary coagulant and as a coagulant aid with metal salts. Different water quality and operational parameters such as pH, turbidity and mixing conditions were investigated. Characterization studies using fluorescence excitation emission matrix indicated that the coagulant protein from M. oleifera was a tyrosine-like protein. Turbidity and bacteria (Escherichia coli) removal efficiency of the purified M. oleifera and metal coagulants were similar. While the removal of bacteria by metal salts was mainly due to coagulation/flocculation, the removal by M. oleifera coagulant was as a result of both coagulation and growth inhibition, which is expected to improve sludge microbiological quality. Among the operational parameters, slow mixing time significantly influenced performance of natural coagulant. At optimum dosages, the crude extract increased the DOC of the treated water significantly whereas the purified coagulant showed a significant removal of fulvic-like DOC fraction. When used in combination with metal salts, adding of M. oleifera before the metal salts showed better turbidity and DOC removal than adding it after the metal salts. aluminium sulphate, bacteria, coagulation, DOC, Moringa oleifera, turbidity This content is only available as a PDF. © IWA Publishing 2009 You do not currently have access to this content.