• 한국포장학회지
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• 제25권2호
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• pp.57-62
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• 2019

The management of oyster shell disposal is an ongoing challenge in the southern coast of Korea because of continuously dumping the oyster shell in environment. Oyster shell wastes could be a biocidal alternative after calcination using a heat treatment. Calcined oyster shell is normally obtained through thermally conversion of $CaCO_3$ (main component in oyster shell (96%)) into CaO. This study provides a brief overview of oyster shell disposal and its potential as an antimicrobial agent with a focus on calcination process, antimicrobial mechanisms, and packaging applications.

• 에너지공학
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• 제27권1호
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• pp.59-64
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• 2018

In this paper, we investigated the alternative sources of limestone. Oyster shell waste originated from aquaculture that causes a major disposal landfill problem in coastal sectors in southeast Korea. Their inadequate disposal causes a significant environmental problems araised. Bio mineralization leads to the formation of oyster shells and consists $CaCO_3$ as a major phase with a small amount of organic matter. It is a good alternative material source instead of natural lime stone. The utilization of oyster shell waste for industrial applications instead of natural limestone is major advantage for conservation of natural limestone. The present work describes the limestone and oyster shells hydraulic activity and chemical composition and characteristics are most similar for utilization of oyster shell waste instead of natural limestone.

• 에너지공학
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• 제27권1호
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• pp.76-80
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• 2018

The objective of this research paper is to discuss the waste coffee residue disposal and its environmental effects on the environment. As we know, coffee is one of the most demand and swallowed beverages in the world, which leads to large quantities of solid waste. Which can be toxic and a lot of environmental problems occur. In developing countries, there is a lack of proper coffee waste residue management. The coffee beans and residues contain several organic compounds. The wastewater from coffee industry emitted several pollutants (highly concentrated) and it contaminates the soil, ground waters, aquatic life, and also human health. Hence it is essential to treat the coffee waste residues. Mean while, oyster shell waste and its disposal also a big environmental challenge in the coastal regions of southeast Korea. In this paper, we focused the treatment of coffee waste residue with oyster shell waste powder. Primarily, oyster shells are calcinated at higher temperatures and investigated the calcined CaO powder as an anti microbic agent to the bacteria presented in coffee waste residues. We successfully applied calcium oxide from oyster shell waste, as an antimicrobic agent.

• 에너지공학
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• 제27권1호
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• pp.51-58
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• 2018

In this paper, we reported that the influence of advanced functional mineral filler calcium carbonate ($CaCO_3$) extracted from oyster shell waste, which are rich mineral sources of $CaCO_3$. Oyster Shells, available in abundance, have no eminent use and are commonly regarded as waste. Their improper disposal causes a significant level of environmental concern and also results in a waste of natural resources. Recycling shell waste could potentially eliminate the disposal problem, and also turn an otherwise useless waste into high value added products. Oyster shell waste calcination process to produce pure lime (CaO) which have good anti-microbial property for waste water treatment and then focuses on its current applications to treat the coffee waste and its effluents for biological treatment and utilization as a fertilizers.

• 에너지공학
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• 제26권2호
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• pp.39-49
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• 2017

Coffee is one of the most popular and consumed beverages in the world, which leads to a high contents of solid residue known as spent coffee grounds (SCG). As is known, coffee beans contain several classes of health related chemicals, including phenolic compounds, melanoidins, diterpenes, xanthines and carotenoids. The waste water coming out of coffee industries has high concentration of organic pollutants and is very harmful for surrounding water bodies, human health and aquatic life if discharged directly into the surface waters. Hence it is essential to treat and manage the coffee waste. Oyster shells are a waste product from mariculture that creates a major disposal problem in coastal regions of southeast Korea. In the study, the oyster shell waste was used to treat the coffee waste and its effluents. Oyster shells are calcined at $1000^{\circ}C$ for 2 h, and allowed to test the calcined CaO powder ability to inhibit the growth of bacteria in different aging coffee wastes. Calcined oyster shell powder showed anti-bacterial effect that inhibited cell growth of Escherichia coli and other bacterial forms. The antimicrobial activity of calcium oxide from oyster shell waste for biological treatment and utilization as a fertilizers with economic ecofriendly in nature.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.146-147
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• 2013

The oyster shells of about 240,000 tons have been annually produced in south coast of South Korea. However, about 25% of the oyster shells (60,000tons) was recycled as oyster seeding and fertilizer due to the limited amount of consumption for such purposes. The stored amount of oyster shell in the fertilizer manufacturing company is overfilled, and thus cannot accept any more of the waste oyster shells. As a result, landfill and illegal dumping of waste oyster shells have become an increasingly serious issue since 2011. In this research, the problems generated by the oyster shells were investigated through surveying activities. One of the possible alternative solutions that can process large amount of waste economically was found to be the application of oyster shells as a construction materials.

• 청정기술
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• 제21권4호
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• pp.241-247
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• 2015

굴 패각은 한국 남쪽의 해안의 바다 양식 폐기물로써 처리문제로 대두되고 있다. 폐기물인 굴 패각을 실용화하기 위해서, 현지 회사에서 구입한 소성된 굴 패각(COS)에 AITC (allyl isothiocyanate)를 흡착시킨 후 식품 감염 질병을 일으키는 박테리아에 대해 성장억제능력을 시험하였다. COS 분말은 Escherichia coli, Staphylococcus aureus, Salmonella thyphimurium 균에 대해 1% 정도의 농도에서 세균 발육 억제 효과를 3에서 5 log 10 CFU/mL로 나타냄으로써 세균 발육 억제 효과를 보였으며, 순수 AITC의 MIC 결과는 Escherichia coli, Staphylococcus aureus, Salmonella thyphimurium에 대해 각각 1 mg/mL, 0.8 mg/mL 0.7 mg/mL을 나타내었다. 소성된 굴 패각은 소성과정에서 기공이 생성되어 225 mg/g의 AITC를 흡착하였고, FTIR 결과로 COS에 AITC가 흡착이 되었음을 확인하였다. 입자의 특성은 매우 미세한 입자 크기 및 높은 선상 표면을 나타내었다. AITC가 흡착된 소성된 굴 패각(ACOS)은 1% 농도에서 완전히 세균 세포를 억제함에 따라, ACOS는 COS보다 더 나은 항균활성을 나타냄을 확인하였으며, 이는 박테리아에 대해 AITC와 소성된 굴 패각의 상승효과가 있음을 나타내었다.

• 한국표면공학회지
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• 제50권6호
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• pp.531-535
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• 2017

Enormous amount of waste oyster-shell (OS) has a major disposal problem in coastal regions. OSs have attracted much attention for recycling, because these are mainly composed of calcium carbonate with rare impurities. In this study, we demonstrate the calcareous deposit films on steel plate by using OSs on the basic of cathodic protection technique. The composition of the OSs was analyzed by wavelength dispersive X-ray fluorescence spectrometer. Carbon dioxide gas was pumped into distilled water to make carbonic acid solution for dissolution of OS. The calcareous deposit was characterized by second electron microscope (SEM), energy dispersive X-ray analysis (EDX) and X-ray diffraction. Corrosion rates were estimated by measurements of anodic polarization and immersion test. It is confirmed that calcareous deposits on steel plate are formed under all condition of cathodic protection by using waste OS from the SEM and EDX results. Calcareous deposits on steel by OS provide good corrosion resistance by acting as a barrier to oxygen supply to the steel surface.

• 한국건축시공학회지
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• 제14권6호
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• pp.523-529
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• 2014

국내에서는 많은 양의 패류가 생산되고 있으나, 이로 인해 발생하는 대량의 패각을 처리하는데 많은 어려움을 겪고 있다. 따라서 본 연구에서는 이러한 패각을 대량으로 처리하기 위하여 건설재료로서의 가능성을 평가하고자 한다. 모르터의 잔골재를 패각으로 치환하여 흡수율, 압축강도를 측정하고 계면결합 형태를 관찰하였다. 대체적으로 패각의 치환율이 증가함에 따라 흡수율은 증가하였으며, 압축강도는 감소하였다. 예외적으로 꼬막 패각을 치환한 모르터는 치환율이 증가함에 따라 압축강도가 증가하였다. 패각 치환율의 증가에 따른 흡수율의 증가 및 압축강도의 감소는 패각 주위에 발생한 다공성 때문인 것으로 파악되었으며, 꼬막 패각을 치환한 모르터는 패각과 시멘트 입자간의 계면결합 형태가 양호하였기 때문에, 오히려 강도가 상승한 것으로 판단된다.

• 유기물자원화
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• 제9권2호
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• pp.66-70
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• 2001

본 연구에서 밭토양은 부산시의 평균 pH인 인공 산성우(pH=5.34) 조건에서 실험되어졌다. 그리고 산성토양 중 화능을 확인하기 위해 토양산도, CEC(양이온 치환능력)와 K, Ca, Na와 같은 알칼리 금속에 대해 분석하였다. 굴껍질은 치환성 양이온을 다량 함유하고 있기 때문에 산성 토양 개선제로의 역할을 할 수 있을 것이고 하수슬러지의 토양 첨가는 슬러지 처분의 대체 방안으로 기대된다. 본 연구의 목적은 하수슬러지 및 굴껍질의 적정처리방법으로 산성토양에 주입시 그 개선효과를 검토하고자 하였다. 토양과 하수슬러지의 비율을 각각 10:0, 9:1, 8:2, 7:3으로 한 것과 토양 : 하수슬러지와 굴껍질 혼합물의 비율을 각각 9:1, 8:2, 7:3으로 한것을 대상토양에 첨가하였다. 실험 결과, 토양산도는 약간 감소하였고 CEC는 약간 증가하는 경향을 나타내었다. 알칼리 금속의 경우는 실험기간동안 지속적으로 감소되어져 토양산도, CEC와는 다른 농도경향을 나타내었다. 결과적으로 굴껍질이 혼합된 하수슬러지는 산성토양 개선제로서 역할을 할 수 있음을 확인하였다.