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Calcium Alginate Production through Forward Osmosis with Reverse Solute Diffusion and Mechanism Analysis.

Da-Qi Cao1, Kai Tang1, Wen-Yu Zhang2

  • 1Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies/Key Laboratory of Urban Stormwater System and Water Environment, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.

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|February 25, 2023
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Summary
This summary is machine-generated.

This study introduces a new method for producing calcium alginate (Ca-Alg) using forward osmosis (FO) and reverse osmosis. The novel process efficiently recovers alginate from sludge, showing promise for sustainable material production.

Keywords:
calcium alginateelectrospinning nanofiber membraneforward osmosisrecoveryreverse solute diffusionthin film composite forward osmosis membrane

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Materials Science

Background:

  • Alginate recovery from aerobic granular sludge is crucial for sustainable resource utilization.
  • Conventional methods for alginate recovery face challenges in efficiency and environmental impact.
  • Novel approaches are needed to optimize the production of calcium alginate (Ca-Alg).

Purpose of the Study:

  • To propose and investigate a novel method for Ca-Alg production using forward osmosis (FO) and reverse osmosis.
  • To analyze the factors influencing Ca-Alg recovery and reverse solute flux (RSF).
  • To explore the potential of a novel FO membrane for Ca-Alg production.

Main Methods:

  • Formation of Ca-Alg in a sodium alginate (SA) feed solution (FS).
  • Concentration of Ca-Alg via FO using CaCl2 as a draw solution, incorporating Ca2+ reverse osmosis.
  • Characterization of Ca-Alg recovery production (CARP) using scanning electron microscopy and energy dispersive spectroscopy.

Main Results:

  • Observed abnormal reverse solute diffusion with RSF influenced by CaCl2 and alginate concentrations.
  • Identified Ca-Alg recovery production (CARP) on the FO membrane surface, accounting for up to 36.28% of total Ca2+.
  • Demonstrated high water flux and Ca2+ RSF using a novel thin film composite FO membrane.

Conclusions:

  • The proposed FO process with Ca2+ reverse osmosis is effective for Ca-Alg production.
  • CARP formation plays a significant role in controlling Ca-Alg production efficiency.
  • The novel FO membrane shows potential for enhanced Ca-Alg recovery from sludge.