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Title: Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products

Abstract

Microbial electrolysis cells have the potential to generate renewable hydrogen from underused waste streams, however current devices have not reached very large productivity targets using real waste products at any scale. This study used a waste from fermented corn stover known as corn stover fermentation product to reach performance metrics that could be commercialized, if adequately scaled. Average current densities in MECs with mature biofilms reached 17.9 +/- 1.6 A/m2 at an organic loading rate of 30 grams of chemical oxygen demand per liter of anode volume per day (g/L-day), reaching a maximum current density of 27.2 +/- 2.9 A/m2. Hydrogen productivities reached 20.2 +/- 2.0 L of H2 per L anode volume per day (L/L-day). These represent the highest current densities and highest hydrogen productivities using a complex feedstock in a microbial electrolysis cell. Organic acids and sugars present in untreated substrate were converted at high percentages in MECs, with most above 90% conversion, at organic loading rates of 10, 20, and 30 g/L-day. The effect of periodic high liquid flow rates through the anode on performance was assessed. These tests, called pulsing, showed that hydrogen productivities and current densities increased most dramatically as flow was pulsed every hourmore » at a baseline flow rate of 0.3 mL/min. These productivities show promise for high performance systems, if adequate scale up can be achieved.« less

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
OSTI Identifier:
1596246
Alternate Identifier(s):
OSTI ID: 1702703
Report Number(s):
NREL/JA-5100-75546
Journal ID: ISSN 0306-2619
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 259; Journal Issue: C; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; microbial electrolysis; corn stover fermentation; commercial hydrogen productivity; renewable energy; BCPL

Citation Formats

Satinover, Scott J., Schell, Daniel J., and Borole, Abhijeet P.. Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products. United States: N. p., 2020. Web. https://doi.org/10.1016/j.apenergy.2019.114126.
Satinover, Scott J., Schell, Daniel J., & Borole, Abhijeet P.. Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products. United States. https://doi.org/10.1016/j.apenergy.2019.114126
Satinover, Scott J., Schell, Daniel J., and Borole, Abhijeet P.. Sat . "Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products". United States. https://doi.org/10.1016/j.apenergy.2019.114126. https://www.osti.gov/servlets/purl/1596246.
@article{osti_1596246,
title = {Achieving high hydrogen productivities of 20 L/L-day via microbial electrolysis of corn stover fermentation products},
author = {Satinover, Scott J. and Schell, Daniel J. and Borole, Abhijeet P.},
abstractNote = {Microbial electrolysis cells have the potential to generate renewable hydrogen from underused waste streams, however current devices have not reached very large productivity targets using real waste products at any scale. This study used a waste from fermented corn stover known as corn stover fermentation product to reach performance metrics that could be commercialized, if adequately scaled. Average current densities in MECs with mature biofilms reached 17.9 +/- 1.6 A/m2 at an organic loading rate of 30 grams of chemical oxygen demand per liter of anode volume per day (g/L-day), reaching a maximum current density of 27.2 +/- 2.9 A/m2. Hydrogen productivities reached 20.2 +/- 2.0 L of H2 per L anode volume per day (L/L-day). These represent the highest current densities and highest hydrogen productivities using a complex feedstock in a microbial electrolysis cell. Organic acids and sugars present in untreated substrate were converted at high percentages in MECs, with most above 90% conversion, at organic loading rates of 10, 20, and 30 g/L-day. The effect of periodic high liquid flow rates through the anode on performance was assessed. These tests, called pulsing, showed that hydrogen productivities and current densities increased most dramatically as flow was pulsed every hour at a baseline flow rate of 0.3 mL/min. These productivities show promise for high performance systems, if adequate scale up can be achieved.},
doi = {10.1016/j.apenergy.2019.114126},
journal = {Applied Energy},
number = C,
volume = 259,
place = {United States},
year = {2020},
month = {2}
}

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