<abstract xmlns="http://www.w3.org/1999/xhtml">Respirometric tests, carried out in OxiTop system, were used to determine biogas production (BP) from two waste materials, willow bark residue (W) from the chemical industry and brewer’s spent grain (BSG) from the brewing industry. Moreover, the kinetics of BP and the loss of organic compounds (expressed as COD) were investigated. In this investigation, W and BSG were used both in their unchanged forms and after mechanical pretreatment (grinding to a diameter of 1 mm) (W_G and BSG_G). The initial organic load in the bioreactors was 4 kg OM/m3. The BP from W was 154.1 dm3/kg DM (166.6 dm3/kg OM), and from BSG, it was 536.9 dm3/kg DM (559.5 dm3/kg OM). This probably resulted from the fact that the content of lignin that was hard to biodegrade was higher in W than in BSG. Mechanical pretreatment increased BP from W_G to 186.7 dm3/kg DM (201.9 dm3/kg OM), and from BSG_G to 564.0 dm3/kg DM (588.7 dm3/kg OM). The net biogas yield from W and BSG increased by 17% (35 dm3/kg OM) and 5 % (29 dm3/kg OM), respectively. The kinetic coefficient of BP (kB) and the rate of BP (rB) of W were lower than those of BSG. Mechanical pretreatment increased the kB and rB of biogas production from both waste materials.</abstract>

Respirometric tests, carried out in OxiTop system, were used to determine biogas production (BP) from two waste materials, willow bark residue (W) from the chemical industry and brewer’s spent grain (BSG) from the brewing industry. Moreover, the kinetics of BP and the loss of organic compounds (expressed as COD) were investigated. In this investigation, W and BSG were used both in their unchanged forms and after mechanical pretreatment (grinding to a diameter of 1 mm) (W_G and BSG_G). The initial organic load in the bioreactors was 4 kg OM/m3. The BP from W was 154.1 dm3/kg DM (166.6 dm3/kg OM), and from BSG, it was 536.9 dm3/kg DM (559.5 dm3/kg OM). This probably resulted from the fact that the content of lignin that was hard to biodegrade was higher in W than in BSG. Mechanical pretreatment increased BP from W_G to 186.7 dm3/kg DM (201.9 dm3/kg OM), and from BSG_G to 564.0 dm3/kg DM (588.7 dm3/kg OM). The net biogas yield from W and BSG increased by 17% (35 dm3/kg OM) and 5 % (29 dm3/kg OM), respectively. The kinetic coefficient of BP (kB) and the rate of BP (rB) of W were lower than those of BSG. Mechanical pretreatment increased the kB and rB of biogas production from both waste materials.

The impact of mechanical pretreatment on biogas production from waste materials of the chemical and brewing industries

Department of Environmental Biotechnology

University of Warmia and Mazury in Olsztyn

Technical Transactions

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.

Respirometric tests, carried out in OxiTop system, were used to determine biogas production (BP) from two waste materials, willow bark residue (W) from the...

The impact of mechanical pretreatment on biogas production from waste materials of the chemical and brewing industries

Published Online: Nov 18, 2020

Page range: -

Received: Mar 25, 2020

Accepted: Nov 05, 2020

DOI: https://doi.org/10.37705/TechTrans/e2020037

Keywords
willow bark residue, brewer’s spent grain, pretreatment step, kinetics of biogas production and loss of COD, lignocellulosic biomass

© 2020 Katarzyna Bernat et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.

The impact of mechanical pretreatment on biogas production from waste materials of the chemical and brewing industries

Published Online: Nov 18, 2020

Page range: -

Received: Mar 25, 2020

Accepted: Nov 05, 2020

DOI: https://doi.org/10.37705/TechTrans/e2020037

Keywordswillow bark residue, brewer’s spent grain, pretreatment step, kinetics of biogas production and loss of COD, lignocellulosic biomass

© 2020 Katarzyna Bernat et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-ShareAlike 4.0 International License.

Keywords
willow bark residue, brewer’s spent grain, pretreatment step, kinetics of biogas production and loss of COD, lignocellulosic biomass