Title: Laboratory evaluation of a water-treatment sequence using Moringa oleifera seed coagulant

Authors: Hitendra Bhuptawat, G.K. Folkard, Sanjeev Chaudhari

Addresses: Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India. ' Department of Engineering, University of Leicester, Leicester LE1, 7RH, UK. ' Centre for Environmental Science and Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India

Abstract: A water extract of Moringa. oleifera seed was applied to a treatment sequence comprising coagulation-flocculation-sedimentation-sand filtration. Model waters (kaolinite suspensions) of turbidities 10, 100, 300 and 700 NTU were prepared. For the 10 NTU water, the optimum dose was only evident when sand filtration was incorporated into the treatment sequence. For the higher water turbidities tested, a relatively broad optimum dose range exists post filtration. After filter ripening, the filtrate turbidities obtained for the 300 and 700 NTU raw water turbidities were 1 NTU and 3 NTU respectively. Headloss development was gradual giving relatively long filter runs.

Keywords: coagulation; flocculation; sediment; filtration; natural coagulants; Moringa oleifera seed; water treatment; sand filtration; water turbidities.

DOI: 10.1504/IJW.2007.015221

International Journal of Water, 2007 Vol.3 No.3, pp.299 - 315

Published online: 27 Sep 2007 *

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