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ISSN : 1229-3431(Print)
ISSN : 2287-3341(Online)
Journal of the Korean Society of Marine Environment and Safety Vol.25 No.7 pp.906-913
DOI : https://doi.org/10.7837/kosomes.2019.25.7.906

Evaluation of Nutrients Removal using Pyrolyzed Oyster Shells

Ilwon Jeong*,Hee-eun Woo**,In-Cheol Lee***,Jinsoo Kim****,Jinsoo Kim***†
*, ***, ** Graduate student, Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea
*** Professor, Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea
**** Legislative Researcher, National Assembly Research Service, Seoul 07233, Korea
* First Author : jeongiw@gmail.com, 051-629-6590
Corresponding Author : hoikim@pknu.ac.kr, 051-629-6590

Abstract

To evaluate the removal performance of PO4-P and NH3-N, laboratory experiments were conducted by filling a container with oyster shells, pyrolyzed at 100℃ (POS100), 600℃ (POS600) and 800℃ (POS800), and passing artificial wastewaters through the container. The pH in the effluent was found to increase due to CaO eluted from oyster shell. Removal amounts of PO4-P of ~23.1 mg/kg, 16.1 mg/kg, and 15.9 mg/kg were obtained when POS100, POS600, and POS800, respectively, were used; therefore, the highest PO4-P removal amount was obtained when POS100 was used. It is considered that Ca and dolomite in the oyster shells adsorbed and precipitated PO4-P. Removal amounts of NH3-N were of ~3.56 mg/kg, 5.72 mg/kg, and 3.97 mg/kg were obtained when POS100, POS600, and POS800, respectively, were used The low removal rate for NH3-N is probably due to unstable nitrification, use of sealed containers, and the effect of NH3-N being converted to NH4 + upon increasing pH. Based on these results, pyrolyzed oyster shell is expected to promote changes in PO4-P and NH3-N concentrations through chemical reactions. These results can also be used for basic research in the development of wastewater treatment.

소성온도에 따른 굴 패각의 영양염 제거 성능 평가

정일원*,우희은**,이인철***,김진수****,김경회***†
*, ** 부경대학교 해양공학과 대학원생, *** 부경대학교 해양공학과 교수, **** 국회입법조사처 국토해양팀 입법조사관

초록

소성 굴 패각의 PO4-P 및 NH3-N의 제거성능을 평가하기 위해 100℃(POS100), 600℃(POS600), 800℃(POS800)로 소성시킨 굴 패각을 시료충전층에 채워 인공오수를 통과시키는 실내실험을 통해 PO4-P 및 NH3-N의 제거 성능을 확인하였다. 시료충전층을 통과한 유출수는 굴 패각에서 용출된 CaO의 영향으로 pH가 상승한 것으로 조사되었다. PO4-P 제거량은 최대 약 23.1 mg/kg(POS100), 16.1 mg/kg(POS600), 15.9 mg/kg(POS800)으로, POS100의 PO4-P 제거량이 높게 나타난 것으로 확인되었다. PO4-P 제거 요인으로는 굴 패각의 Ca 및 Dolomite가 PO4-P를 흡착·침전시킨 것으로 판단된다. NH3-N 제거량은 최대 약 3.56 mg/kg(POS100), 5.72 mg/kg(POS600), 3.97 mg/kg(POS800)으로 나타났다. NH3-N의 제거율이 낮은 요인으로는 불안정한 질산화 과정, pH의 상승으로 인해 NH3-N가 NH4 +로 변환된 영향 등의 복합적인 원인으로 판단된다. 이상의 결과를 통해 소성 굴 패각은 화학 반응을 통해 PO4-P 및 NH3-N 농도를 감소시킨 것으로 판단되며, 본 연구의 결과는 향후 소성 굴 패각을 활용한 하수처리 기술개발을 위한 기초자료로 활용 될 수 있을 것으로 판단된다.

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