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

Ye-Eun Lee, Jun-Ho Jo, I-Tae Kim and Yeong-Seok Yoo
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Ye-Eun Lee: 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
Jun-Ho Jo: 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
I-Tae Kim: 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
Yeong-Seok Yoo: 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

Energies, 2018, vol. 11, issue 9, 1-16

Abstract: 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 m 2 ?g −1 and 0.002 to 0.007 cm 3 ?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.

Keywords: food waste; food-waste biochar; pyrolysis; NaCl template; desalination (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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