• 한국건축시공학회지
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• 제14권1호
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• pp.94-101
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• 2014

굴과 꼬막과 같은 패각의 일부는 채묘종과 비료 등으로 재활용 되기도 하나, 대부분 인근 해안에 적치 되거나 불법 매립되고 있는 실정이다. 본 연구에서는 패각의 기초물성을 측정하고 패각을 시멘트 모르터에 혼입할 수 있는 가능성을 평가하고자 하였다. 그 결과 패각을 25% 혼입한 시멘트 모르터의 경우 흡수율과 압축강도가 Plain과 유사하게 측정되었다. 반면 굴패각을 25% 혼입한 경우 Plain에 비해 압축강도가 35% 저하되었으며, 흡수율은 2배로 증가하였다. 따라서 굴을 제외한 나머지 패각을 25% 범위 내에서 시멘트 모르터에 혼입하여 사용하는 것은 가능할 것으로 사료된다. 하지만 굴의 경우 다양한 혼입율을 적용한 추가 실험이 요구될 것으로 판단된다.

• 한국지반공학회논문집
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• 제21권3호
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• pp.79-85
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• 2005

굴양식장에서 무단 투기되거나 임의로 야적 및 매립되어 환경피해와 오염을 유발하는 굴껍질을 유효하게 재활용하기 위한 기반연구를 수행하였다. 본 논문의 연구목적은 굴껍질을 이용하여 지반개량을 목적으로 하는 친환경적인 고화재를 개발하는 것이다. 개발한 고화계는 준설토에 적용하여 그 성능을 실험적으로 규명하였다. 굴껍질 고화재를 혼합한 준설토의 압축강도특성을 파악하기 위해, 준설토의 함수비와 고화계의 혼합비 및 양생일을 변화시켜 실내시험을 수행하였다. 실험결과에 근거하여, 굴껍질을 활용하여 제조된 친환경적 고화계는 지반개량재로 합당한 것을 알 수 있었다.

• 한국염색가공학회지
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• 제29권2호
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• pp.62-68
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• 2017

Coffee sludge and onion shells are known typically as waste resources as well as simultaneously being the raw material for dye having a golden brown color. This research studies the dyeability, functionality, and colors of woolen fabric after being dyed by different dyeing method using coffee sludge and onion shells extract. The woolen fabric was refined and pre-mordanted with tannin. The dyeing process conducted was single-dye, using coffee sludge and onion shells extract, sequential multi-dye, consecutively dyeing with coffee sludge and onion shells, and mixed-dye, blending coffee sludge extract and onion shells extract to dye. The dyeing was measured on the surface color, color fastness, and UV-protection ability. As a result, the expression of various hues of tan using coffee sludge and onion shells extract were shown to be possible. Additionally, single-dye, sequential multi-dye, mixed-dye had generally superiority in color fastness to light, all rating 3 and color fastness to washing, rating 3 or 4, showing relatively stable color fastness to washing. The UV protection ability was shown to be better, especially appearing satisfactory in the UV-B protection, all measured to be over 90%.

• 한국환경보건학회지
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• 제24권3호
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• pp.124-130
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• 1998

This study was to examine the utilization of waste egg snells for removal of heavy metals in laboratory wastewater. It was estimated that pH increasing formed heavy metals into a hydroxide and then settled to remove them. Removal rate of heavy metals were increased as increased dosage, low adsorbate concentration and passed reaction time. Average adsorption volumes of Cr, Cu, Mn and Pb per g were about 1.21 mg, 1.1 mg, 0.96 mg and 1.04 mg, respectively. If we reflected the adsorption capacity(k) and adsorption intensity(1/n) of Freundlich isotherm, we couldn't consider waste egg shells as a good adsorbent. It seemed that heavy metals contained in complex wastewater was removed to be influenced by inital pH, solubilities with passed reaction rime and competitive reaction.

• 한국세라믹학회지
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• 제47권6호
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• pp.524-528
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• 2010

In this study, the structure and properties of waste oyster shell and its phosphorus removal efficiency were investigated. Waste oyster shells are troublesome environmental waste in the coastal region where the oysters are produced. Waste oyster shells were pyrolyzed by bench-scale rotary kiln for its activation. It shows maximum 76% of phosphorus removal efficiency for the municipal wastewater and livestock wastewater. We found that the activated oyster shells can be used as a phosphorus removal agent with the consideration of high efficiency, easy processing, and cost effectiveness.

• 한국환경보건학회지
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• 제26권3호
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• pp.43-49
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• 2000

A laboratory experiments were performed to investigate the effects of several factors on the phosphorus removal by waste oyster shells. The waste oyster shells used in this experiments were crushed particle, calcined particle and extracted solution. A higher efficiencies of phosphorus removal were observed, when a particle size of crushed and calcined particle were smaller. The effluent concentration of phosphorus was around 1.6mg/ι in continuous column experiment which packed with crushed particle of waste oyster shell at the influent concentration of PO4-P of 10 mg/ι. But the clogging of column occurred with increasing of throughput volume of influent. The efficiency of phosphorus removal increased with increasing of dosage amount of crushed, calcined particle and extracted solution. When the calcined particle which contained only about 1/10~1/100 of crushed particle was used, the efficiency of phosphorus removal was correspondingly equivalent to the removal efficiency obtained from crushed particle. The efficiency of phosphorus removal by calcined particle after 9 runs repeated use was decreased about 21.5% as that of the first run. The removal efficiency of 100% could have been achieved at the HRT of 18 hours during the continuous treatment of phosphorus by the solution extracted from calcined particle.

• 수산경영론집
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• 제51권2호
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• pp.71-87
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• 2020

Oysters are the most abundantly harvested type of shellfish in Korea. As export of this marine product increases, oysters have greatly contributed to an increase in fishing income. As the oyster aquaculture industry has rapidly grown since the late 1990s, issues of oyster-shell processing that occur in production processes have re-emerged as important topics in the oyster industry. The amount of oyster shells harvested in 2019 is estimated to be approximately 300,000 tons. With reductions in demand for pyrolytic fertilizer and feed, which are currently the greatest sources of demand, unprocessed shell quantities have doubled compared to 2018, causing them to be an issue once more. Such oyster-shell processing also incurs great costs, and a total of forty-six billion three hundred fifty million Korean won (46,350,000,000 KRW) has been provided from 2009 to 2020 for the use of oyster shells as a resource. According to current Korean laws, oyster shells are considered to be industrial waste if more than 300 kilograms are sent out in a day. Collection and processing must be conducted by a waste-consignment company. Consequently, there are many limitations to the use of oyster shells in Korea as a resource. However, in Japan, only oyster-shell waste is regulated by waste-processing As a result, local governments may apply exceptions when utilized as organic matter. Consequently, in Japan, oyster shells are being used as resources in more diverse fields than in Korea. This study observes the conditions and problems of oyster-shell processing in Korea and attempts to find new domestic oyster-shell resource solutions in light of Japan's recycling practices.

• 자원리싸이클링
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• 제7권3호
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• pp.36-41
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• 1998

본 연구에서는 도금폐수의 처리 및 폐굴껍질의 재활용 방안으로 폐굴껍질의 중화능과 중금속 흡착능을 Bohart-Adam 식에 의한 현장적용인자를 도출하여 향후 폐굴껍질과 유사한 성분을 함유하고 있는 수산폐기물의 재활용 가능성을 고찰해보고자 한다. 국내 해안 양식업 중에 비중이 높은 굴양식업은 다량의 폐굴껍질을 부산물로 발생시키며 이 폐굴껍질은 여러 가지 환경문제를 야기시키고 있다. 이러한 폐굴껍질은 약 93% 정도의 $CaCO_3$성분을 함유하고 있어 산성폐수의 pH 상승에 의한 중화능과 다공질체로서 중금속과 유기물에 대한 높은 흡착효율을 기대 할 수 있다. 여기서, 흡착탑의 사용시간과 흡착효율만 비교해 보면, 흡착탑의 사용시간은 Cr>Fe>Cu 순으로 나타났으나, 흡착효율은 Fe>Cr>Cu 순으로 나타났다. 이것은 흡착효율면에서 Fe이 Cr보다 우수하지만, Fe이 Cr에 비해 고농도이기 때문에 단시간에 배출기준농도에 도달함을 알 수 있다.

• 한국건설순환자원학회지
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• 제11권1호
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• pp.11-16
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• 2016

• 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.