Separators used in microbial electrochemical technologies: Current status and future prospects

Area of Science:

• Environmental Science
• Electrochemistry
• Materials Science

Background:

• Microbial electrochemical technologies (METs) are green processes for waste treatment and resource recovery.
• Nafion proton exchange membranes (PEM) are standard separators in METs but suffer from high cost, material crossover, and biofouling.
• Alternative separators are needed to improve MET performance and sustainability.

Purpose of the Study:

• To review the current state of porous separators as alternatives to Nafion PEM in METs.
• To analyze the advantages and disadvantages of various porous separator materials.
• To identify future research directions for optimizing porous separators in METs.

Main Methods:

• Literature review of studies on alternative separators for METs.
• Comparative analysis of performance metrics for different separator types.
• Identification of key challenges and opportunities in porous separator development.

Main Results:

• Porous materials like J-cloth, nylon filters, and ceramics enable non-ion selective charge transfer, outperforming PEM in some aspects.
• Low-cost porous separators mitigate issues associated with Nafion PEM, including cost and crossover.
• These materials offer a promising avenue for enhancing the efficiency and economic viability of METs.

Conclusions:

• Porous separators represent a viable and cost-effective alternative to Nafion PEM for microbial electrochemical technologies.
• Further research into optimizing porous material properties and integration is crucial for widespread adoption.
• The development of advanced porous separators can significantly advance sustainable waste treatment and bioenergy production.