A novel process of adsorption cum enhanced coagulation-flocculation spiked with magnetic nanoadsorbents for the removal of aromatic and hydrophobic fraction of natural organic matter along with turbidity from drinking water

摘要

The present study developed a novel conjugate process for the removal of aromatic, hydrophobic fraction of natural organic matter and turbidity from drinking water supplies. Magnetic nanoadsorbents were synthesized under laboratory conditions and their surface properties were enhanced by surface modifiers followed by their characterization. The synthesized magnetic nanoadsorbents was then used in combination with conventional aluminum and iron coagulants for the removal of both natural organic matter and turbidity from drinking water. Adsorption cum enhanced coagulation-flocculation study was conducted in two different stages i.e. adsorption of natural organic matter by magnetic nanoadsorbents (stage 1) followed by coagulation-flocculation experiments using conventional coagulants like alum and ferric chloride (stage 2). Study indicated that magnetic nanoadsorbents-alum conjugate process is efficient in removing trihalomethane precursors. Significant removal of dissolved organic matter (98.7%), ultra violet absorbance at 254 nm (99.7%) and trihalomethane formation potential (91%) was achieved. The overall study showed that the developed magnetic nanoadsorbents-alum conjugate process is highly efficient in removing the trihalomethane precursors with a marked reduction in the overall cost for its large scale application. (C) 2019 Elsevier Ltd. All rights reserved.