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논문 기본 정보

자료유형
학술저널
저자정보
김우항 (목포해양대학교) Annaliza P. Cainglet (핀란드 오울루 대학교)
저널정보
한국환경기술학회 한국환경기술학회지 한국환경기술학회지 제20권 제6호
발행연도
2019.1
수록면
400 - 408 (9page)

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This study assessed the effects of differing pre-treated oyster shell powder (OSP) concentration (OSP g/L) along with varying pH in the formation of calcium phosphate [Ca3(PO4)2] for the removal of phosphate in the water. The effect of acid on the regeneration of pre-treated OSP was evaluated as well. Each method includes a mixture of the PO43- solution and the pre-treated OSP which were; (1) raw OSP (ROSP) prepared using sun dried oysters hell, (2) heated OSP (HOSP) prepared by heating the shells to 750 ℃ and lastly, (3) NaOH-treated OSP (TOSP) by soaking the oyster shells to 2.5M NaOH solution. Batch and continuous mode tests were done for HOSP and the PO43-removal efficiency after regeneration by 1.2N HCl was investigated. HOSP showed higher removal compared to ROSP of up to 99 % as the pH of the solution increases to pH 10 which signifies that precipitation of Ca3(PO4)2in the form of hydroxyapatite (HAP) took place. Additionally, TOSP showed a high removal efficiency (97.5 % of PO43-removal) as the concentration increases regardless of the increase in pH. The gradual addition of NaOH in the filter column for the continuous test maintained PO43-removal. Regeneration was achieved using 1.2N of HCl solution regardless of the method of addition. Removal efficiency of PO43- was observed to reach 98 % of removal after regeneration.

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