EVALUATION OF BACTERIAL CELLULOSE-SODIUM ALGINATE FORWARD OSMOSIS MEMBRANE FOR WATER RECOVERY

Authors

  • Ngan T. B. Dang Chemical Engineering Department, De La Salle University, 2401 Taft Avenue, Manila 1004, Philippines
  • Liza B. Patacsil Chemical Engineering Department, Malayan Colleges Laguna, Pulo Diezmo Road, Cabuyao City, Laguna 4025 Philippines
  • Aileen H. Orbecido Chemical Engineering Department, De La Salle University, 2401 Taft Avenue, Manila 1004, Philippines
  • Ramon Christian P. Eusebio Engineering Science Department, University of the Philippines Los Banos, College, Laguna, Philippines
  • Arnel B. Beltran Chemical Engineering Department, De La Salle University, 2401 Taft Avenue, Manila 1004, Philippines

DOI:

https://doi.org/10.11113/jt.v80.12742

Keywords:

Bacterial cellulose, sodium alginate, forward osmosis, water recovery, composite membrane

Abstract

Water resources are very important to sustain life. However, these resources have been subjected to stress due to population growth, economic and industrial growth, pollution and climate change. With these, the recovery of water from sources such as wastewater, dirty water, floodwater and seawater is a sustainable alternative. The potential of recovering water from these sources could be done by utilizing forward osmosis, a membrane process that exploits the natural osmotic pressure gradient between solutions which requires low energy operation. This study evaluated the potential of forward osmosis (FO) composite membranes fabricated from bacterial cellulose (BC) and modified with sodium alginate. The membranes were evaluated for water flux and salt rejection. The effect of alginate concentrations and impregnation temperatures were evaluated using 0.6 M sodium chloride solution as feed and 2 M glucose solution as the draw solution. The membranes were characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Contact Angle Meter (CAM). The use of sodium alginate in BC membrane showed a thicker membrane (38.3 μm to 67.6 μm), denser structure (shown in the SEM images), and more hydrophilic (contact angle ranges from 28.39° to 32.97°) compared to the pristine BC membrane (thickness = 12.8 μm and contact angle = 66.13°). Furthermore, the alginate modification lowered the water flux of the BC membrane from 9.283 L/m2-h (LMH) to value ranging from 2.314 to 4.797 LMH but the improvement in salt rejection was prominent (up to 98.57%).

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Published

2018-05-16

Issue

Vol. 80 No. 3-2: Membrane for Sustainable Food, Energy, and Environment

Section

Science and Engineering

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How to Cite

EVALUATION OF BACTERIAL CELLULOSE-SODIUM ALGINATE FORWARD OSMOSIS MEMBRANE FOR WATER RECOVERY. (2018). Jurnal Teknologi (Sciences & Engineering), 80(3-2). https://doi.org/10.11113/jt.v80.12742