• Title, Summary, Keyword: oyster shell

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Consolidation to Bulk Ceramic Bodies from Oyster Shell Powder (굴 패각 분말로부터 벌크 세라믹 구조체 제조)

  • Cho, Kyeong-Sik;Lee, Hyun-Kwuon;Min, Jae Hong
    • Journal of Korean Powder Metallurgy Institute
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    • v.23 no.3
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    • pp.221-227
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    • 2016
  • Waste oyster shells create several serious problems; however, only some parts of them are being utilized currently. The ideal solution would be to convert the waste shells into a product that is both environmentally beneficial and economically viable. An experimental study is carried out to investigate the recycling possibilities for oyster shell waste. Bulk ceramic bodies are produced from the oyster shell powder in three sequential processes. First, the shell powder is calcined to form calcium oxide CaO, which is then slaked by a slaking reaction with water to produce calcium hydroxide $Ca(OH)_2$. Then, calcium hydroxide powder is formed by uniaxial pressing. Finally, the calcium hydroxide compact is reconverted to calcium carbonate via a carbonation reaction with carbon dioxide released from the shell powder bed during firing at $550^{\circ}C$. The bulk body obtained from waste oyster shells could be utilized as a marine structural porous material.

Determination of calcium content and dissolution characteristics of oyster shell by ICP-AES (유도결합플라즈마 원자방출분광법을 이용한 모려 칼슘의 함량 및 용출 특성 분석)

  • Yang, Dong-Hyug;Lee, Mi-Young
    • Analytical Science and Technology
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    • v.23 no.4
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    • pp.389-394
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    • 2010
  • An ICP-AES method for determination of calcium content and dissolution characteristics of oyster shell (Ostrea gigas) has been developed and validated. Total calcium content in oyster shell was determined using ICPAES. The dissolution characteristics, which would reflect the composition of $CaCO_3$ polymorphs and calcium salts in oyster shell, were also evaluated by dissolution test. The total calcium contents ranged from 31.8 to 39.9% and the dissolution ratios varied from 62.7 to 83.6% (n=15). The determination of calcium content and dissolution characteristics by ICP-AES would provide useful information for the quality control of oyster shell.

The Influence of Aqueous Ionic, Condition on the Adsorption Features of Fluoride Ion on Waste Oyster Shell (수중 이온 환경이 폐굴껍질에 대한 불소 이온의 흡착 양상에 미치는 영향)

  • Lee, Jin-Sook;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
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    • v.23 no.3
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    • pp.314-318
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    • 2007
  • The feasibility of the employment of waste oyster shell as an adsorbent for fluoride ion has been tested by considering the effect ionic condition on the adsorption of fluoride ion on oyster shell. The adsorption capacity of oyster shell for fluoride ion was found not to be significantly influenced by the ionic strength of aqueous environment. The existence of complexing agent such as nitrilotriacetic acid in wastewater decreased the adsorbed amount of fluoride ion by forming a stable complex of $CaT^-$ and the adsorption reaction of fluoride ion on oyster shell was examined to be endothermic. The coexisting heavy metal ionic adsorbate in wastewater hindered the adsorption of fluoride ion, however, its adsorbed amount was increased as the particulate size of adsorbent was decreased. Finally, a serial adsorption column test has been conducted for a practical application of adsorption process and the breakthrough of the column adsorption was observed in 22 hours under the experimental condition.

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

  • Thenepalli, Thriveni;Ramakrishna, Chilakala;Ahn, Ji Whan
    • Journal of Energy Engineering
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    • v.26 no.2
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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.

Permeability and Shear Strength Characteristics of Oyster Shell-Sand Mixture for Application to SCP (모래다짐말뚝(SCP) 적용을 위한 굴패각.모래 혼합토의 투수 및 전단 강도 특성)

  • Yoon, Hyun-Suk;Lee, Ki-Ho;Park, Jun-Boum;Lee, Hyung-Joo
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.863-868
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    • 2004
  • The use of oyster shells is proposed as a substitute construction material for geotechnical applications. To investigate recycling possibility as a substitute of sand compaction pile (SCP) for oyster shells, the geotechnical characteristics including permeability and shear strength of crushed oyster shell, sand and crushed oyster shell-sand mixted soil. Experimental results show that the crushed oyster shells are lighter than sand in weight, and have similar characteristics on permeability to sand. The results of direct shear test show that the measured value of friction angle ${\Phi}$ of crushed oyster shell was lager than that of sand. It would be expected that more angular particles (crushed oyster shells) would interlock more thoroughly than rounded particles (send).

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A study on Calcination Characteristics of Powdered Oyster Shell (굴패각 재활용 방안에 관한 기초연구 -굴패각 소성가공특성-)

  • Kim, Jong-Oh;Lee, Sang Eun;Lee, Chang-Ho
    • Journal of the Korea Organic Resources Recycling Association
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    • v.15 no.1
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    • pp.143-148
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    • 2007
  • The objective of this study was to investigate the proper conditions of calcination and calcium extraction from powdered oyster shell. The physical characteristics such as particle size distribution, surface morphology, and thermal gravity were examined. The following result were obtained. As the powdered oyster shell was ignited in high temperature of $650^{\circ}C$ to $950^{\circ}C$, the calcination reactions was effectively progressed. The amount of weight loss during calcination would be matched with the generation of carbon dioxide gas. In the calcination of powdered oyster shell, the amount of weight loss increased according to the increased of calcination temperature and the decrease of mean particle size. It was founded that the proper temperature and retention time of calcination was $850^{\circ}C$ and 40 minute. In the extraction of calcium into liquid form using acid addition, the calcination oyster shell was more effective than the non-calcinated shell. The liquid calcium extraction technique using the calcinated oyster shell needed more researches considering cost evaluation.

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Effect of Oyster Shell Powder on Soil pH and Growth and Yield of Apple (토양의 산도교정과 사과 생육에 대한 패화석 시용 효과)

  • Lee, Seong-Tae;Lee, Young-Han;Lee, Young-Jin;Lee, Chun-Hee
    • Korean Journal of Soil Science and Fertilizer
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    • v.37 no.6
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    • pp.383-387
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    • 2004
  • Effects of oyster shell powder as a liming material were investigated in an apple orchard. Soil texture of the apple orchard was silty clay loam (Upyeong series with 7% of slope) and topsoil pH was 5.6. Treatments of 1,590 kg oyster shell powder $ha^{-1}$ and calcium-magnesium carbonate as much as oyster shell powder were included in the experiment. With treatments of oyster shell powder and calcium-magnesium carbonate, the length, number and diameter of new branches and the diameter of main, secondary and side branches increased in comparison with control. With oyster shell powder application, soil pH increased from 5.6 to 6.8 at the harvest. In addition, it increased exchangeable Ca from 2.6 to $4.2cmol_c\;kg^{-1}$. But it didn't make any difference in chlorophyll, sugar and malic acid contents. The apple weight per fruit of oyster shell powder application was 9 g more than that of control. Apple yield was highest ($37,000kg\;ha^{-1}$) in the oyster shell powder treatment, and the yield increase was significantly different at 5% level LSD. We concluded that the oyster shell powder can be an alternative of lime and effective to restore soil nutrient balance in apple orchard soil.

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
    • Journal of Energy Engineering
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    • v.27 no.1
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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.

Shear Strength and Compressibility of Oyster Shell-Sand Mixtures for Sand Compaction Pile (SCP공법 적용을 위한 굴패각-모래 혼합토의 전단과 압축특성)

  • Yoon Gil-Lim;Yoon Yeo-Won;Chae Kwang-Seok;Kim Jae-Kwon
    • Journal of the Korean Geotechnical Society
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    • v.20 no.9
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    • pp.17-23
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    • 2004
  • Strength and deformation characteristics of oyster shell-sand mixtures were investigated to utilize waste oyster shell being treated as a waste material. Standard penetration test (SPT) is a common method to obtain in-situ strength in sand. However, in case of oyster shell-sand mixtures, there was no information between SPT N-value and internal friction angle of mixture soils. In this paper SPT experiments from several large scaled model chamber tests and large scaled direct shear tests were carried out with varying unit weight of oyster shell-sand mixtures. Appropriate correlations were in tile study observed among N-value, unit weight and internal friction angle, which make it possible to estimate in-situ strength from SPT and the coefficient of volume compressibility from the confined compression tests to compute the settlement of oyster shell-sand mixtures.

Changes of Soil Properties with Various Soil Amendments in Saemangeum Reclaimed Tidal Saline Soil

  • Lee, Sanghun;Kim, Hong-Kyu;Hwang, Seon-Woong;Lee, Kyeong-Bo
    • Korean Journal of Soil Science and Fertilizer
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    • v.46 no.4
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    • pp.281-287
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    • 2013
  • Due to its high salt content and poor physical properties in reclaimed tidal lands, it is important to ameliorate soil physical properties to improve the efficiency of desalination. The objective of this study was to evaluate the changes of soil properties at Saemangeum reclaimed tidal saline soil with various soil amendments. Field experiment was conducted at Saemangeum reclaimed tidal land in Korea and the dominant soil series was Munpo series (coarse loamy, mixed, nonacid, Mesic, Typic, Fluvaquents). Woodchips, crushed-stone, oyster shell, coal bottom ash, and rice hull were added as soil amendments and mixed into surface soil to improve soil physical properties. There was large variability in soil hardness, but oyster shell treatment was significantly lower soil hardness at surface layer. Soil hardness was not significantly different below 15 cm depth. Infiltration rate was also significantly greater at oyster shell treatment. This may be due to the leaching of Ca ions from oyster shell and improved soil properties. However, there was no statistical significant difference of the soil bulk density, moisture content, and porosity. Improved physical properties increased desalinization rate in soil and retarded the resalinization rate when evapotranspiration rate was high. Although soil salinity was significantly decreased with oyster shell amendment, soil pH was increased that should be made up as a soil amendment. Our results indicated that oyster shell application increased infiltration rate and improved soil hardness, and thus oyster shell could be used to improve soil salinity level at Saemangeum reclaimed tidal saline soil.