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Area of Science:

  • Membrane science and technology
  • Electrochemistry
  • Fluid dynamics

Background:

  • Bacterial cellulose membranes are utilized in various separation processes.
  • Understanding transport phenomena and instabilities in membrane systems is crucial for process optimization.
  • Concentration boundary layers and hydrodynamic instabilities can significantly impact membrane performance.

Purpose of the Study:

  • To investigate the time-current characteristics of bacterial cellulose membrane systems under different concentration configurations.
  • To analyze the influence of initial concentration quotient on membrane current pulsations and hydrodynamic instabilities.
  • To compare the temporal changes in membrane currents between configurations with lower and higher concentrations above the membrane.

Main Methods:

  • Experimental setup involving bacterial cellulose membranes in a horizontal plane with NaCl solutions.
  • Time-current measurements under varying concentration gradients.
  • Analysis of hydrodynamic instabilities using Fast Fourier Transform (FFT) and Short Time Fourier Transform (STFT).

Main Results:

  • Stable concentration boundary layers formed with lower concentration solutions above the membrane.
  • Current pulsations, indicative of hydrodynamic instabilities, were observed with higher concentrations above the membrane and a sufficiently large initial concentration quotient ((Ch/Cl)o).
  • Increased (Ch/Cl)o led to higher pulsation frequencies and altered amplitudes; FFT showed a non-linear dependence of signal power on (Ch/Cl)o, peaking at 2500.
  • STFT analysis revealed increased amplitudes and activity of instabilities over time and frequency with rising (Ch/Cl)o, with significant activity observed within the first 50 minutes for (Ch/Cl)o > 2500.

Conclusions:

  • The configuration with higher concentration above the membrane is prone to hydrodynamic instabilities, manifesting as current pulsations.
  • (Ch/Cl)o is a critical parameter influencing the frequency, amplitude, and temporal dynamics of these instabilities.
  • STFT analysis of current difference signals provides enhanced resolution for studying hydrodynamic instabilities in membrane systems.