Effects of voltage application on hydrogen production performance and stabilization in an electro-supported dynamic membrane bioreactor
Abstract
Introduction: A novel electro-supported dynamic membrane bioreactor (EDMBR) was by integrating electrode function into a dynamic membrane module made of a stainless steel mesh support with a pore size of 444 mm. This work aimed to investigate the effects of voltage application on stabilization time, hydrogen production performance, metabolic pathway shift, and microbial community change during continuous hydrogen production.
Methods: Two independent EDMBR systems were operated under continuous conditions at different applied voltages ranging from 30 to 700 mV. Hydrogen production performance, soluble byproducts, suspended biomass, biofilm concentration, and microbial community were analyzed under different operational conditions.
Results: Voltage application in the EDMBR influenced both process stabilization and biological responses during continuous biohydrogen production. Electrical input was associated with accelerated stabilization time through improved biomass retention, whereas sustained voltage application was related to a shift in metabolic pathways and changes in microbial community. Voltage application reduced the stabilization time required to reach pseudo-steady-state from 8 days to 3 days. However, excessive electrical input was associated with decreased hydrogen production performance and localized corrosion of the electro-supported mesh under elevated current density conditions.
Discussion: These results indicate a trade-off between rapid stabilization and…
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