Fabrication of Mg-Doped Sargassum Biochar for Phosphate and Ammonium Recovery

Ye-Eun Lee, Yoonah Jeong, Dong-Chul Shin, Kwang-Ho Ahn, Jin-Hong Jung and I-Tae Kim
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Ye-Eun Lee: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
Yoonah Jeong: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
Dong-Chul Shin: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
Kwang-Ho Ahn: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
Jin-Hong Jung: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea
I-Tae Kim: Department of Environmental Research, Korea Institute of Civil Engineering and Building Technology, Goyang-daero 283, Ilsanseo-gu, Goyang-si 10223, Gyeonggi-do, Korea

Sustainability, 2021, vol. 13, issue 22, 1-15

Abstract: Biochars prepared from macro-algae have a lower C/N ratio compared to lignocellulosic biochar, which is advantageous for direct nutrition. In particular, Sargassum , a marine macro-algae, has a high Mg content; hence, it can be expected to adsorb P and N simultaneously. In this study, Sargassum horneri biochar (SB), pyrolyzed at 400, 500, and 600 °C, was doped with innate Mg through water leaching, and nutrient recovery from the wastewater-mimicking solution was confirmed. The biochar pyrolyzed at 600 °C showed maximum Mg adsorption during water leaching, and the efficiency of K and Na removal was also high, at 92.7% and 91.9%, respectively. The addition of MgCl 2 during pyrolysis and high ion exchange did not show distinct advantages for surface modification and nutrient adsorption. X-ray photoelectron spectroscopy analysis confirmed the participation of biochar in the surface adsorption of Mg and PO 4 recovery. The PO 4 sorption capacity of biochar reached >120 mg·g −1 , while the sorption capacity for NH 4 was low, at 22.8–28.2 mg·g −1 , suggesting that Mg-surface-doped SB presented excellent phosphorus recovery. Hence, upgrading an adsorbent as a wastewater-treatment material and soil ameliorant that recovers nutrients using innate Mg from Sargassum is possible through appropriate surface modification.

Keywords: phosphate recovery; ammonia recovery; Mg doping; Sargassum horneri; algal biochar (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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