Hydrothermal liquefaction aqueous phase treatment and hydrogen production using electro-oxidation

TY - JOUR

T1 - Hydrothermal liquefaction aqueous phase treatment and hydrogen production using electro-oxidation

AU - Matayeva, Aisha

AU - Biller, Patrick

N1 - Publisher Copyright: © 2021 The Author(s)

PY - 2021/9

Y1 - 2021/9

N2 - Post-hydrothermal liquefaction (HTL) aqueous phase treatment is an emerging issue and must be addressed for the commercial application of the HTL process. This study investigates the simultaneous production of hydrogen and reduction of chemical oxygen demand by applying electro-oxidation using boron doped diamond electrodes. Two types of hydrothermal liquefaction aqueous phases produced from wheat straw and sewage sludge are investigated and the largest chemical oxygen demand removal (82 and 99%) and hydrogen production rates (2.0 and 1.8 NL/h) were attained at the highest current density. However, a positive energy return on investment of an integrated HTL-electro oxidation process can only be achieved at the lowest current density where the removal of organics and hydrogen production is lower. Analysis via GC–MS and GC-FID shows that complex aromatic compounds are degraded first through the formation of organic acids that are oxidized only with longer residence times and more severe current densities.

AB - Post-hydrothermal liquefaction (HTL) aqueous phase treatment is an emerging issue and must be addressed for the commercial application of the HTL process. This study investigates the simultaneous production of hydrogen and reduction of chemical oxygen demand by applying electro-oxidation using boron doped diamond electrodes. Two types of hydrothermal liquefaction aqueous phases produced from wheat straw and sewage sludge are investigated and the largest chemical oxygen demand removal (82 and 99%) and hydrogen production rates (2.0 and 1.8 NL/h) were attained at the highest current density. However, a positive energy return on investment of an integrated HTL-electro oxidation process can only be achieved at the lowest current density where the removal of organics and hydrogen production is lower. Analysis via GC–MS and GC-FID shows that complex aromatic compounds are degraded first through the formation of organic acids that are oxidized only with longer residence times and more severe current densities.

KW - Aqueous phase

KW - Electrochemical oxidation

KW - Hydrogen

KW - Hydrothermal liquefaction

KW - Sewage sludge

KW - Wheat straw

UR - http://www.scopus.com/inward/record.url?scp=85109038705&partnerID=8YFLogxK

U2 - 10.1016/j.enconman.2021.114462

DO - 10.1016/j.enconman.2021.114462

M3 - Journal article

AN - SCOPUS:85109038705

SN - 0196-8904

VL - 244

JO - Energy Conversion and Management

JF - Energy Conversion and Management

M1 - 114462

ER -