Electrons recycle concept in a microbial electrolysis cell for biogas upgrading

2021 ◽  
Author(s):  
Lorenzo Cristiani ◽  
Jacopo Ferretti ◽  
Marco Zeppilli
Keyword(s):  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Biogas Upgrading ◽  
Microbial Electrolysis

scholarly journals Bioelectromethanogenesis reaction in a tubular Microbial Electrolysis Cell (MEC) for biogas upgrading

2020 ◽  
Vol 158 ◽  
pp. 23-31 ◽  
Author(s):  
Marco Zeppilli ◽  
Lorenzo Cristiani ◽  
Edoardo Dell’Armi ◽  
Mauro Majone
Keyword(s):  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Biogas Upgrading ◽  
Microbial Electrolysis

scholarly journals Ammonium Recovery and Biogas Upgrading in a Tubular Micro-Pilot Microbial Electrolysis Cell (MEC)

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2723 ◽  
Author(s):  
Lorenzo Cristiani ◽  
Marco Zeppilli ◽  
Cristina Porcu ◽  
Mauro Majone
Keyword(s):  
Nitrogen Recovery ◽  
Electrolysis Cell ◽  
Co2 Removal ◽  
Microbial Electrolysis Cell ◽  
Biogas Upgrading ◽  
Anodic Chamber ◽  
Load Rate ◽  
Cathodic Chamber ◽  
Microbial Electrolysis ◽  
Nitrogen Load Rate

Here, a 12-liter tubular microbial electrolysis cell (MEC) was developed as a post treatment unit for simultaneous biogas upgrading and ammonium recovery from the liquid effluent of an anaerobic digestion process. The MEC configuration adopted a cation exchange membrane to separate the inner anodic chamber and the external cathodic chamber, which were filled with graphite granules. The cathodic chamber performed the CO2 removal through the bioelectromethanogenesis reaction and alkalinity generation while the anodic oxidation of a synthetic fermentate partially sustained the energy demand of the process. Three different nitrogen load rates (73, 365, and 2229 mg N/Ld) were applied to the inner anodic chamber to test the performances of the whole process in terms of COD (Chemical Oxygen Demand) removal, CO2 removal, and nitrogen recovery. By maintaining the organic load rate at 2.55 g COD/Ld and the anodic chamber polarization at +0.2 V vs. SHE (Standard Hydrogen Electrode), the increase of the nitrogen load rate promoted the ammonium migration and recovery, i.e., the percentage of current counterbalanced by the ammonium migration increased from 1% to 100% by increasing the nitrogen load rate by 30-fold. The CO2 removal slightly increased during the three periods, and permitted the removal of 65% of the influent CO2, which corresponded to an average removal of 2.2 g CO2/Ld. During the operation with the higher nitrogen load rate, the MEC energy consumption, which was simultaneously used for the different operations, was lower than the selected benchmark technologies, i.e., 0.47 kW/N·m3 for CO2 removal and 0.88 kW·h/kg COD for COD oxidation were consumed by the MEC while the ammonium nitrogen recovery consumed 2.3 kW·h/kg N.

Hydrogen gas production with an electroformed Ni mesh cathode catalysts in a single-chamber microbial electrolysis cell (MEC)

2015 ◽  
Vol 40 (41) ◽  
pp. 14095-14103 ◽  
Author(s):  
Abudukeremu Kadier ◽  
Yibadatihan Simayi ◽  
K. Chandrasekhar ◽  
Manal Ismail ◽  
Mohd Sahaid Kalil
Keyword(s):  
Gas Production ◽  
Hydrogen Gas ◽  
Electrolysis Cell ◽  
Microbial Electrolysis Cell ◽  
Single Chamber ◽  
Cathode Catalysts ◽  
Microbial Electrolysis
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