Recovery of nutrients from biofuel ash via organic acid-facilitated solid-liquid extraction.

Autor: Drapanauskaitė D; Lithuanian Research Centre for Agriculture and Forestry, Instituto al.1, LT-58344, Akademija, Kedainiai District, Lithuania. Electronic address: donata.drapanauskaite@lammc.lt., Barčauskaitė K; Lithuanian Research Centre for Agriculture and Forestry, Instituto al.1, LT-58344, Akademija, Kedainiai District, Lithuania., Bunevičienė K; Lithuanian Research Centre for Agriculture and Forestry, Instituto al.1, LT-58344, Akademija, Kedainiai District, Lithuania., Urbonavičius M; Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania., Varnagiris Š; Center for Hydrogen Energy Technologies, Lithuanian Energy Institute, 3 Breslaujos, 44403 Kaunas, Lithuania., Baltrusaitis J; Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, PA, 18015, USA.
Jazyk: angličtina
Zdroj: Chemosphere [Chemosphere] 2024 Sep; Vol. 363, pp. 142945. Date of Electronic Publication: 2024 Jul 24.
DOI: 10.1016/j.chemosphere.2024.142945
Abstrakt: Solid-liquid extraction was investigated to obtain selected major plant nutrients (P, K, Ca, Mg) from biofuel ash using weak organic acids like salicylic acid, citric acid, and oxalic acid as sacrificial leaching agents. In this study, three organic acids were compared to determine the most effective leaching agent for maximizing the P, K, Ca, and Mg extraction from biofuel ash. The findings indicated that 0.1 M citric acid was the most efficient for plant nutrient recovery, with 81.9% of P recovered after 30 min, 82.4% of Ca, 76.8% of Mg, and 47.3% of K. after 120 min. The highest amount of K, with 59.3% was recovered after 180 min of extraction with 0.1 M oxalic acid. However, recovery of P-80.7% was lower, and much lower recovery of Ca-2.3%, and Mg-68.6% after 180 min of extraction with 0.1 M oxalic acid. The leachates were not contaminated with heavy metals, just 0.47 mg/L of Zn, 7.67 mg/L of Al, and 1.99 mg/L of Fe were detected after 180 min of extraction with 0.1 M oxalic acid. The formation of calcium oxalates after extraction with 0.1 M oxalic acid was seen by SEM-EDS. The findings indicated that to achieve the highest recovery of all beneficial nutrients (P, K, Ca, Mg) different extraction times and different extraction agents are required.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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