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

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...

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Bibliographic Details
Published in:Energies (Basel) 2018-09, Vol.11 (9), p.2341
Main Authors: Lee, Ye-Eun, Jo, Jun-Ho, Kim, I-Tae, Yoo, Yeong-Seok
Format: Article
Language:English
Subjects:
Cellulose
Charcoal
Clustering
desalination
Food
Food processing
Food waste
food-waste biochar
Lignin
NaCl template
Potassium chloride
Pyrolysis
Salt
Sodium chloride
Surface area
Waste treatment
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11092341