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경상대학교 농화학식품공학과

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Chem. Eng. J., Available online 11 February 2025, 160536 | https://doi.org/10.1016/j.cej.2025.160536 Crop root exudate-responsive fertilizers fabricated by structural conversion of wastewater activated sludges into phenolic polymer-incorporated ceramic-like particles

Nguyen Thanh Phong ^a, Jiwon Kim ^a, Eun-Nam Joe^a, Manar Tag ^a, Jeong Gu Lee ^d, Mira Choi ^e, Kyoung-Soon Chang ^e, Ho Young Yoon ^a,f, Jong-Rok Jeon ^a,b,c

^aDivision of Applied Life Science (BK21Plus), Gyeongsang National University, Jinju 52828 Republic of Korea
^bDepartment of Applied Life Chemistry, Gyeongsang National University, Jinju 52828 Republic of Korea
^cInstitute of Agricultural and Life Science (IALS), Gyeongsang National University, Jinju 52828 Republic of Korea
^dDepartment of Applied Biosciences, Kyungpook National University, Daegu 41566 Republic of Korea
^eDigital Omics Research Center Team, Korea Basic Science Institute, Cheongju 28119 South Korea
^fLaboratory of Natural Materials Technology, Åbo Akademi University, Henrikinkatu 2, Turku FI-20500 Finland

Corresponding authors: Ho Young Yoon, Jong-Rok Jeon

Abstract

Herein, scalable methods are proposed for synthesizing ceramic-like particles from wastewater-derived activated sludge through a combination of heat and acid treatment, followed by alkaline precipitation. During the heat/acid co-treatment, solubilized elements (e.g., P, K, Ca, N, and Fe) and fragmented organic compounds are enriched from the sludge. Subsequently, ceramic-like, low-crystalline particles containing high-molecular-weight phenolics are obtained through alkaline precipitation. Compared to raw sludge, these particles exhibit rapid nutrient release in response to citric acid present in crop root exudates. Notably, the nutrient release kinetics driven by the organic acid surpass those induced by the corresponding HCl-driven pH changes, suggesting that the complexation of phenolics and metal ions in the particles is directly disrupted by organic acids, leading to accelerated particle dissolution. Furthermore, lettuce plants capable of secreting organic acids from their roots are shown to grow more rapidly with the synthesized particles than with raw activated sludge or even commercial chemical fertilizer. These findings confirm that enhanced responsiveness to crop root exudates can be achieved by converting activated sludge into materials enriched with inorganic compounds and phenolic polymers, offering significant benefits for agronomic applications.

논문정보

형식Research article
게재일2025년 02월 (BRIC 등록일 2025-02-12)
연구진국내(교신)+국외 연구진
분야 바이오·의료융합 > 바이오소재

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