패각을 이용한 농업용 지속성 담지체의 효과에 대한 연구

오은하 ( Eun Ha Oh ),공승대 ( Seung Dae Kong ) 한국유화학회 2010 한국응용과학기술학회지 Vol.27 No.4

Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. An experimental study was carried out to investigate the recycling possibility of waste oyster shells, which induce environmental pollutions by piling up out at the open or the temporary reclamation. The purpose of this study is to develope eco-friendly binder using waste oyster shells, and to reinforce soils fur soft soil improvement. In this paper, a series of laboratory tests including compressive pot tests were performed to evaluate characteristics of soils treated by developed waste oyster shells with different water content of soils. Based on test results, eco-friendly Supporter manufactured from waste oyster shells were estimated as good resource materials for soft soil improvements. We got the conclusion by a series of experiment, It is verified that change of pH of soil is improved by mixing with oyster shells. The homogenization method for deducing apparent of oyster shells, which can consider micro-structure of mixed soil, is introduced. The improvement treatment leaded to enlarge fluctuation of soil moisture content. The effect of calcium concentration was good though improvement treatment of physical property. In addition, the crop yield in amelioration plots increased. It means that the increase of crop yield was caused by improvement of soil physical properties rather than improvement of calcium concentration.

Impact of Waste Coffee Residue Disposal on the Environment and Anti-microbic Activity of Oyster Shell Waste

Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1

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.

Environmental Effect of the Coffee Waste and Anti-Microbial Property of Oyster Shell Waste Treatment

Thenepalli, Thriveni,Ramakrishna, Chilakala,Ahn, Ji Whan The Korean Society for Energy 2017 에너지공학 Vol.26 No.2

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.

분쇄패각이 시멘트 모르터의 물성에 미치는 영향

김지현,정철우,이재용 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.1

Approximately 240,000 tons of waste shells are produced annually in the south and west coast of South Korea. Some of these waste shells (oyster, cockle) are recycled as seeding collector and fertilizer, but most are dumped illegally near the coast. One of the alternative solutions that can economically utilize a large amount of these waste shells is to apply them to the production of construction materials. In this research, the basic physical properties of waste shells such as oyster, cockle, clam, manila clam were investigated, and were used to prepare cement mortar with a 25% replacement ratio of sand. According to the results, the 28 day compressive strength of cement mortar with cockle and manila clamshells was similar to that of plain cement mortar. The compressive strength decreased by about 18% when clam was used. However, the cement mortar with oyster shell showed about a 35% reduction in 28-day compressive strength, and two times the absorption capacity of plain cement mortar. The reduction in compressive strength and the increase in absorption capacity were mostly associated with the porous nature of the oyster shell. 굴과 꼬막과 같은 패각의 일부는 채묘종과 비료 등으로재활용 되기도 하나, 대부분 인근 해안에 적치 되거나 불법 매립되고 있는 실정이다. 본 연구에서는 패각의 기초물성을 측정하고 패각을 시멘트 모르터에 혼입할 수 있는가능성을 평가하고자 하였다. 그 결과 패각을 25% 혼입한 시멘트 모르터의 경우 흡수율과 압축강도가 Plain과 유사하게 측정되었다. 반면 굴패각을 25% 혼입한 경우Plain에 비해 압축강도가 35% 저하되었으며, 흡수율은 2배로 증가하였다. 따라서 굴을 제외한 나머지 패각을25% 범위 내에서 시멘트 모르터에 혼입하여 사용하는 것은 가능할 것으로 사료된다. 하지만 굴의 경우 다양한 혼입율을 적용한 추가 실험이 요구될 것으로 판단된다.

Extraction of Precipitated Calcium Carbonate from Oyster Shell waste and Its Applications

Ramakrishna, Chilakala,Thenepalli, Thriveni,Nam, Seong Young,Kim, Chunsik,Ahn, Ji Whan The Korean Society for Energy 2018 에너지공학 Vol.27 No.1

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.

패각의 소성 특성 및 지속성 담지체 제조에 관한 연구

김용렬(Yong Ryul Kim),윤철훈(Cheol Hun Yoon) 한국유화학회 2008 한국응용과학기술학회지 Vol.26 No.2

Today, wastes of much quantity by fast industrialization and increase in population, population concentration etc. of modem society are increasing. Much oyster shell is breeding by character and conduct of oyster-industry for a long time among them. Oyster shell which breed by-product in oyster cultivating industry that specific gravity of domestic seashore cultivating industry is high is causing environmental problem by problem and so on hindrance, nature spectacle s waste and health hygiene on administration if it is pollution of district along the coast fishing ground, number of public ownership being stored in open area in seashore. About new material just-in-time through recycling and he of oyster shell by these problem wide that study. Go forward more and investigate special quality that is oyster shell s physical chemistry red in this research and oyster shell oyster shell which cause several environmental problems developing ability agricultural chemicals that use this encapsulating micro by ability carrier that is environmentally application possibility examine wish to.

A Brief Review on Limestone Sources and Oyster Waste Generation-Bantayan

Yu, Kwang Sun,Thriveni, Thenepalli,Jegal, Yujin,Whan, Ahn Ji The Korean Society for Energy 2017 에너지공학 Vol.26 No.1

Limestone is an important commodity in Philippines. Limestone has numerous uses that range from agricultural applications to building materials to medicines. Many limestone products require rock with specific physical and chemical characteristics. Most limestone is biochemical in origin meaning the calcium carbonate in the stone originated from shelled oceanic creatures. In this paper, we reported the natural sources of limestone, geological formation of limestone and the oyster shell waste in Cebu, Bantayan, Philippines were reported. Due to the mining or quarrying in Cebu, Bantayan, in a limestone area poses the threat of groundwater pollution (since limestone is a porous geologic formation with a high transmissivity). The other environmental issue is oyster shell waste. The oyster shell waste is the major source of limestone. We developed and applied appropriate technologies for the extraction of limestone from oyster shell waste and utilizes as high value added material.

Oyster-Zeolite 흡착탑을 이용한 하수의 유기물질과 질소제거

정병길,정유진,박성현,최호은,성낙창 東亞大學校 建設技術硏究所 2005 硏究論文集 Vol.29 No.1

The objective of this study is to investigated the removal possibility of organic matter and nitrogen contained final effluent of sewage treatment plant using oyster-zeolite adsorption column with waste oyster shell and natural zeolite. The raw water was collected the final effluent of Janglim sewage treatment plant in Busan city. The organic matter and T-N removal efficiency ranged from 2~60% and 38~97%, respectively. In conclusion, oyster-zeolite adsorption column could organic matter and nitrogen removal of final effluent of sewage treatment plant and its economical efficiency is enough because of using recycled waste oyster shell and a cheap natural zeolite.

Volatile organic compounds (VOCs) adsorption and thermal insulation study of oyster shell powder

Md. Niamul Haque,Junghyun Kwon,Suwan Ahn,Jongsoo Lee,Sunghyun Kwon 한국해양환경·에너지학회 2015 한국해양환경공학회 학술대회논문집 Vol.2015 No.5

Oyster shell waste has been a serious hazard in many fishery areas in Korea. Oyster waste has also been said to be a promising adsorbent for reducing popular environmental contaminants such as volatile organic compounds (VOC) and thermal conductivity incorporated with building materials also an important characteristics. We investigated those properties in this research. Thermal conductivity measured by thermograph and the concentrations of the contaminants determined by HPLC or FID method in gas chromatography. Based on Fourier’s 2<SUP>nd</SUP> law of heat conduction we found that conductionrelated coefficients and parameters could greatly influence on the thermal profile of oyster shell. 180 minute adsorption study results revealed that the initial concentrations did not seem to make any difference in adsorption performance but higher oyster content strongly lead to higher VOC adsorption. This research was supported by the Fund of Research Promotion Program(2014-03-011), Gyeongsang National University, 2014.

Polyethylenimine-crosslinked calcium silicate hydrate derived from oyster shell waste for removal of Reactive Yellow 2

강수빈,Zhuo Wang,원성욱 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.1

Large amounts of oyster shells are often dumped in natural water and landfills, causing pollution and health/sanitation issues. It is highly desirable to convert oyster shell wastes into high-value-added products. In this study, an oyster shell waste-based adsorbent, polyethylenimine-crosslinked synthesized calcium silicate hydrate (PEI/S-CSH), was developed through a two-step processing route consisting of CSH synthesis and PEI crosslinking. The prepared adsorbent was characterized using FT-IR, XRD, BET, FE-SEM, and Zeta potential analyzer, and the results showed that the PEI/S-CSH was successfully prepared. In addition, the adsorption performance of PEI/S-CSH was investigated for a reactive dye, Reactive Yellow 2 (RY2), and adsorption experiments were conducted for variables such as pH value, initial concentration, and time. The PEI/S-CSH removed more than 90% of the initial RY2 concentration in the pH range of 2–7, and was almost unaffected in the NaCl concentration range of 0.01–0.1 M. The maximum RY2 uptake of PEI/S-CSH by the Langmuir model was estimated to be 235.0 and 156.0 mg/g at pH 2 and 7, respectively. The adsorption equilibrium was affected by the pH change and equilibrium was reached within 10 min at pH 2 and 30 min at pH 7. The reusability of PEI/S-CSH was investigated through repeated adsorption/desorption evaluation for a total of five times. As a result, PEI/S-CSH showed good adsorption/desorption performance for RY2 up to five times. Therefore, PEI/S-CSH can be considered as an adsorbent with high potential for removing reactive dyes.