Now showing1 - 2 of 2
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Tuning membraneless microbial electrolysis cells operation alters efficiency and anodic microbiome toward scalable hydrogen production from sludge-hydrolysate(Elsevier, 2026-01-21); ; ; ; The practical implementation of microbial electrolysis cells (MECs) is hindered by challenges in optimizing system performance with complex substrates. This study addresses that gap by evaluating MECs fed with hydrolysate, an appealing substrate rich in organic-acids. Through systematic variation of substrate concentration (20–60 %), pH (5–8), and applied anodic potential ( 0.2 to +0.4 V vs standard hydrogen electrode [SHE]), the optimal operational conditions were defined as 40 %-hydrolysate, pH 8, and +0.4 V vs SHE, yielding a mean current density of 3.4 A/m2 and coulombic efficiencies (CE) of 38 % and 96 % based on total organic carbon (TOC) and total volatile fatty acids (VFAs), respectively. Scalability was demonstrated using a 10 L rotating disk bioelectrochemical reactor (RDBER) at 0 and 0.4 V vs SHE, achieving a maximum hydrogen production rate of 30.57 L/m2/d and minimal methane formation at 0.4 V. These findings offer a framework for optimizing MECs under real-feedstock conditions.Publicationtype: Journal Article33 15 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Advancing microbial electrolysis cells (MECs) for efficient wastewater-to-energy conversion(2026); The global energy crisis and fossil fuel impacts highlight the need for sustainable energy carriers such as hydrogen. Microbial electrolysis cells (MECs) can generate hydrogen from organic waste, but their optimization under complex feedstock conditions remains challenging. Accordingly, this study focused on optimizing key parameters to enhance MEC performance. Variation in flow velocity (0.2 and 0.8 mm/s) in Geobacter sulfurreducens and Shewanella oneidensis co-culture biofilms, cultivated in a microfluidic bioelectrochemical system, showed that S. oneidensis exhibited a pronounced flow-dependent response. Higher shear stress produced thinner but more electroactive biofilms, linked to biofilm formation through mechanosensing pathways. To further evaluate system performance, the effects of substrate concentration (20–60%), pH (5–8), and applied anodic potential (−0.2 to +0.4 V vs standard hydrogen electrode [SHE]), in a cylindrical microbial electrolysis cell (Cylindrical-MEC) were also studied. Optimal performance was achieved at 40 % hydrolysate, pH 8, and +0.4 V vs. SHE, yielding a mean current density of 3.4 A/ m² and coulombic efficiencies (CE) of 95 %. Metagenomic and PCA analyses revealed that high anodic potential and alkaline pH enriched Geobacter-dominated communities while suppressing methanogens. In a 10-L rotating disk bioelectrochemical reactor (RDBER), operation at 0.4 V vs. SHE achieved a hydrogen production rate of 30.57 L/m²·d with minimal methane formation. The hydrogen produced under these conditions was subsequently utilized for the autotrophic synthesis of acetoin.Publicationtype: Doctoral Thesis45 17