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Lactic Acid and Salt Separation Using Membrane Technology.

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Summary

Researchers explored recovering lactic acid from acid whey waste. While partial separation from salts was achieved using reverse osmosis and electrodialysis, neither method provided sufficient purity for direct use, requiring further purification steps.

Keywords:
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Area of Science:

  • Food Science & Technology
  • Chemical Engineering
  • Environmental Science

Background:

  • Acid whey, a dairy processing by-product, contains valuable components like lactic acid.
  • Current recovery methods for protein and lactose leave a salt and lactic acid mixture.
  • Further valorization of acid whey necessitates efficient lactic acid recovery.

Purpose of the Study:

  • To investigate the recovery of lactic acid from acid whey waste streams.
  • To evaluate the efficacy of low-energy reverse osmosis (RO) and electrodialysis (ED) for lactic acid separation.
  • To determine the feasibility of these processes for industrial application.

Main Methods:

  • Utilized reverse osmosis membranes under varying pressures and pH.
  • Employed electrodialysis with different feed solution compositions.
  • Analyzed separation efficiency based on lactic acid and salt retention/permeation.

Main Results:

  • Reverse osmosis achieved partial separation of lactic acid from potassium chloride, enhanced by low pressure, pH, and temperature.
  • Electrodialysis also yielded partial separation, but lactic acid losses increased with added sodium chloride.
  • Neither RO nor ED provided sufficient purity, indicating challenges with complex feed streams.

Conclusions:

  • Low-energy RO and ED show potential for partial lactic acid recovery from acid whey.
  • Process efficiency is sensitive to operating conditions and feed composition complexity.
  • Further purification steps are essential to obtain high-purity lactic acid from these methods.