Coagulation mechanism of salt solution-extracted active component in Moringa oleifera seeds

Article English OPEN
Okuda, Tetsuji ; Baes, Aloysius U. ; Nishijima, Wataru ; Okada, Mitsumasa (2001)
  • Publisher: Elsevier
  • Journal: Water Research, volume 35, issue 3, pages 830-834 (issn: 0043-1354)
  • Related identifiers: doi: 10.1016/S0043-1354(00)00296-7
  • Subject: salt extraction | bivalent cation | coagulation | natural coagulant | 519 | moringa oleifera

This study focuses on the coagulation mechanism by the purified coagulant solution (MOC-SC-PC) with the coagulation active component extracted from M. oleifera seeds using salt solution. The addition of MOC-SC-PC into tap water formed insoluble matters. The formation was responsible for kaolin coagulation. On the other hand, insoluble matters were not formed when the MOC-SC-PC was added into distilled water. The formation was affected by Ca2+ or other bivalent cations which may connect each molecule of the coagulation active component in MOC-SC-PC and form netlike structure. The coagulation mechanism of MOC-SC-PC seemed to be an enmeshment by the insoluble matters with netlike structure. In case of Ca2+ ion (bivalent cations), at least 0.2mM was necessary for coagulation at 0.3 mg-C l-1 dose of MOC-SC-PC. Other coagulation mechanisms like compression of double layer, interparticle bridging or charge neutralization were not responsible for the coagulation by MOC-SC-PC.
Share - Bookmark