Flux enhancement in a cross flow nanofiltration by trans-membrane pressure pulsation and flow reversal for the reclamation of waste water


Nanofiltration is gradually evolving from a novel approach into an efficient and eco-friendly unit operation in the arena of separation science and technology. Despite several advantages to its credit, decline in permeate flux or throughput over the period of operation is the major and inevitable drawback of all the pressure driven membrane processes including nanofiltration. This is predominantly attributed to the phenomena of concentration polarization and membrane fouling. Two novel strategies namely trans-membrane pressure pulsation and flow reversal have been proposed to be applied in a nanofiltration process to assess its suitability in the mitigation of permeate flux in a flat sheet module in the present project. The pressure pulsation method is expected to create unsteadiness in the membrane system by generating pulsation periodically, which can sweep the membrane surface when moving downstream. In flow reversal technique frequent change in direction of feed flow will not allow solute particle at the membrane surface to form a stable layer, thereby reducing the chances of solid accumulation at the membrane surface. Wastewater samples containing reactive dye, and some selected heavy metals are planned to be studied. Permeate quality in terms of selected wastewater parameters (like COD, TDS, color, conductivity etc.) will be analyzed. Textural and surface characteristics of the different NF membranes will be studied to analyze the fouling behaviors. Flux decline and its dynamics due to the change of operating parameters will be assessed quantitatively based on a resistance in series model. This work permits a way of flux enhancement in the various flow regimes where build up of concentration polarization considerably reduces the permeate flux. In addition suitability of various cleaning methods to enhance flux recovery and reusability of membrane will also be evaluated.

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Project Info

  • Principal Investigator:
    Dr. Tejal M Patel
  • Co Investigator
    Dr. Kaushik Nath
  • Duration
    2 Years
  • Amount
    Rs .210000
  • Funding Agency
  • tejalpatel@gcet.ac.in
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