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Open AccessArticle

Influence of NaCl Concentration on Food-Waste Biochar Structure and Templating Effects

by Ye-Eun Lee 1,2, Jun-Ho Jo 1, I-Tae Kim 1 and Yeong-Seok Yoo 1,2,*
1
Division of Environment and Plant Engineering, Korea Institute of Civil Engineering and Building Technology, 283 Goyang- daero, Ilsanseo-gu Goyang-si, Gyeonggi-do 10223, Korea
2
Department of Construction Environment Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
*
Author to whom correspondence should be addressed.
Energies 2018, 11(9), 2341; https://doi.org/10.3390/en11092341
Received: 3 August 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Biomass Chars: Elaboration, Characterization and Applications Ⅱ)
Food-waste-derived biochar structures obtained through pyrolysis and with different NaCl concentrations were investigated. Increased NaCl concentration in the samples inhibited cellulose and lignin decomposition, ultimately increasing the biochar yield by 2.7% for 20%-NaCl concentration. NaCl added in solution state exhibited templating effects, with maximum increases in the Brunauer–Emmett–Teller (BET) surface area and pore volume of 1.23 to 3.50 m2∙g−1 and 0.002 to 0.007 cm3∙g−1, respectively, after washing. Adding a high concentration (20%) of NaCl reduced the BET surface area. In contrast, the mean pore diameter increased owing to the increased NaCl clustering area. Increased NaCl clustering with increased added NaCl was shown to have positive effects on NaCl removal by washing. Furthermore, as the NaCl adhered to the KCl scattered in the food waste, a high NaCl concentration also had positive effects on KCl removal. This study reports on an investigation on the effects of varying NaCl concentrations injected in solution form on the structure of food-waste biochar during pyrolysis. The templating effect was considered using both added NaCl and NaCl already contained in the food waste, with implementation of a desalination process essential for food-waste treatment for recycling. View Full-Text
Keywords: food waste; food-waste biochar; pyrolysis; NaCl template; desalination food waste; food-waste biochar; pyrolysis; NaCl template; desalination
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Lee, Y.-E.; Jo, J.-H.; Kim, I.-T.; Yoo, Y.-S. Influence of NaCl Concentration on Food-Waste Biochar Structure and Templating Effects. Energies 2018, 11, 2341.

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