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Removal of phosphate from water by paper mill sludge biochar

Authors
Zhang, MingLin, KunLi, XiaodianWu, LijunYu, JieCao, ShuangZhang, DongXu, LihengParikh, Sanjai J.Ok, Yong Sik
Issue Date
15-1월-2022
Publisher
ELSEVIER SCI LTD
Keywords
Phosphate; Biochar; Adsorption; Paper mill sludge; Zero-valent iron (ZVI); One-step process; Waste-to-wealth strategy
Citation
ENVIRONMENTAL POLLUTION, v.293
Indexed
SCIE
SCOPUS
Journal Title
ENVIRONMENTAL POLLUTION
Volume
293
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137530
DOI
10.1016/j.envpol.2021.118521
ISSN
0269-7491
Abstract
Biochar modification by metals and metal oxides is considered a practical approach for enhancing the adsorption capacity of anionic compounds such as phosphate (P). This study obtained paper mill sludge (PMS) biochar (PMSB) via a one-step process by pyrolyzing PMS waste containing ferric salt to remove anionic P from water. The ferric salt in the sludge was transformed into ferric oxide and zero-valent-iron (Fe0) in N2 atmosphere at pyrolysis temperatures ranging from 300 to 800 degrees C. The maximum adsorption (Qm) of the PMSBs for P ranged from 9.75 to 25.19 mg P/g. Adsorption is a spontaneous and endothermic process, which implies chemisorption. PMSB obtained at 800 degrees C (PMSB800) exhibited the best performance for P removal. Fe0 in PMSB800 plays a vital role in P removal via adsorption and coprecipitation, such as forming the equivalent to Fe-O-P ternary complex. Furthermore, the possible chemical precipitation of P by CaO decomposed from calcite (CaCO3; an additive of paper production that remains in PMS) may also contribute to the removal of P by PMSB800. Moreover, PMSBs can be easily separated magnetically from water after application and adsorption. This study achieved a waste-to-wealth strategy by turning waste PMS into a metal/metal oxide-embedded biochar with excellent P removal capability and simple magnetic separation properties via a one-step pyrolysis process.
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College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles

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