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Hidayat, Syarif,Song, Young-Hyun,Park, Joo-Yang Elsevier 2017 Bioresource Technology Vol.240 No.-
<P><B>Abstract</B></P> <P>A continuous flow microbial reverse-electrodialysis electrolysis cell (MREC) was operated under non-buffered substrate with various flow rates of catholyte effluent into anode chamber to investigate the effects on the hydrogen gas production. Adding the catholyte effluent to the anolyte influent resulted in increased salt concentration in the anolyte influent. The increasing anolyte influent salt concentration to 0.23M resulted in improved hydrogen gas production, Coulombic recovery, yield, and hydrogen production rate to 25±1.4mL, 83±5%, 1.49±0.15mol-H<SUB>2</SUB>/mole-COD, 0.91±0.03m<SUP>3</SUP>-H<SUB>2</SUB>/m<SUP>3</SUP>-V<SUB>an</SUB>/day, respectively. These improvements were attributed to the neutral pH rather than increase in anolyte conductivity as there was no significant improvement in the reactor performance when the NaCl was directly added to the reactor. These results show that addition of catholyte effluent into the anode chamber improved the MREC performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The catholyte effluent used instead of buffer saline in MREC reactor. </LI> <LI> Maintain anolyte in neutral pH more necessary rather than increasing conductivity. </LI> <LI> Yield of hydrogen gas was 1.49±0.15mol-H<SUB>2</SUB>/mole-COD. </LI> <LI> Hydrogen gas production rate was 0.91±0.03m<SUP>3</SUP>-H<SUB>2</SUB>/m<SUP>3</SUP>-V<SUB>an</SUB>/day. </LI> <LI> The addition of catholyte effluent into anode chamber improved MREC performance. </LI> </UL> </P>
송영현,Syarif Hidayat,Agus Jatnika Effendi,박주양 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In this research, a novel Microbial reverse-electrodialysis electrolysis struvite-precipitation cell (MRESC)was developed for energy recovery through struvite (MgNH4PO4 6H2O) crystallization and hydrogenproduction concurrently in a single process without any electrical-grid energy consumption. This hybridsystem can effectively transfer the salinity gradient energy to electrical energy as a driving force toproduce hydrogen gas coupled with struvite recovery and organic wastewater degradation. A MRESCcontaining 10 pairs of RED cells, supplied solutions typical of high concentration (600 mM NaCl) and lowconcentration (12 mM NaCl) at 1.0 mL/min, was operated in the fed-batch mode. The rates of hydrogenproduction and struvite crystallization were determined to be 0.71 m3-H2/m3-Van/d and 7.62 g/m2/h,respectively. The gas produced was >92% H2. The Coulombic efficiency was close to or above 100% with aCOD removal of 84 6%, and an overall energy efficiency of 28%. The morphology and structure of themain component of accumulated crystal at the cathode were verified by a scanning electron microscopewith energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction. These results showed that theMRESC system could be used as an effective bioelectrochemical method for energy recovery in the formof pure hydrogen gas and struvite simultaneously.
Byung-Min An,Seok-ju Seo,Syarif Hidayat,Joo-Yang Park 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-
Scaling-up of microbial fuel cells (MFCs) operated in a continuous mode requires technology transferfrom the lab into thefield. The effect of scale-up on the MFC performance was evaluated by comparing themaximum power density and removal efficiency of ethanolamine using two MFC reactors with differentworking volumes. Experiments using a scaled-up MFC with different organic loading rates (OLRs) incontinuous mode were conducted to obtain sustainable electricity production and enhanced treatmentcapacity with afixed hydraulic retention time (HRT) of 6.2 h. In comparative experiments to investigatescale-up effects, the maximum power density significantly decreased from 0.24 to 0.085 W m 2 due tothe increased surface area on the electrode from 25 to 180 cm2. However, satisfactory removal efficienciesof chemical oxygen demand (COD) and ammonia were obtained in the scale-up MFC experiments in thefed-batch mode with different concentrations of ethanolamine (i.e., 100 and 250 mg L 1). In addition,removal efficiencies of COD and ammonia were significantly influenced by experimental conditions inthe continuous mode with different OLRs (0.27, 0.66, and 1.33 g COD L 1 day 1). These resultsdemonstrate the importance of ensuring optimal OLRs as a critical factor for scaling-up an MFC incontinuous mode.