Engineering Conferences International ECI Digital Archives Pyroliq 2019: Pyrolysis and Liquefaction of Biomass and Wastes Proceedings 6-20-2019 e application of pyrolysis biochar for wastewater treatment Serge Kaliaguine Raoof Bardestani Follow this and additional works at: hps://dc.engconfintl.org/pyroliq_2019 Part of the Engineering Commons
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The application of pyrolysis biochar for wastewater treatment
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Engineering Conferences InternationalECI Digital ArchivesPyroliq 2019: Pyrolysis and Liquefaction ofBiomass and Wastes Proceedings
6-20-2019
The application of pyrolysis biochar for wastewatertreatmentSerge Kaliaguine
Raoof Bardestani
Follow this and additional works at: https://dc.engconfintl.org/pyroliq_2019
Application of pyrolysis biochar in wastewater treatment
Raoof Bardestani, Serge Kaliaguine
Department of Chemical Engineering
Laval University
Pyroliq 2019, June 16-19, 2019
Cork, Ireland
The Pyrovac vacuum pyrolysis process
• Original biochar
pyrolysis of shredded wood comprising 20% volume of spruce/fir and 80% pine with moisture content of 10%, under following conditions:
T=475 °C
Wood residence time: 15 min
Atmosphere pressure
• Mildly oxidized biochar
mild air oxidation under flowing air:
T= 200±10 °C with heating ramp of 3 K min−1
Oxidation duration= 1 h
Air flow rate= 165±10 cm3min−1
SampleSBET
(m2 g-1)
Vtotal
(cm3 g-1)Dpore
(nm)
Yield***
(%)
Original biochar 50* 0.03 1.5 27.8
Oxidized biochar65**
0.04 1.6 20
* Degassing temperature 400 °C under vacuum for 16h** Degassing temperature 300 °C under vacuum for 24h*** Based on mass of anhydrous biomass feedstock
Nitrogen physisorption analysis
Nitrogen adsorption-desorption isotherms DFTpore size distribution
Sample VolatileFixed
carbonAsh C H O N
Original biochar 23.5 75.2 1.3 73.3 4.1 22.5 0.1
Oxidized biochar 41.8 54.7 3.5 71.6 3.0 25.1 0.3
Proximate and elemental analyses (wt.%)
(a) The concentrations of Surface acidic functional
groups by Boehm titration
(a’) surface acidic density and oxygen mass fraction