• Title, Summary, Keyword: oyster shell

Search Result 366, Processing Time 0.044 seconds

Fundamental Study on the Probability of Oyster Shell Desiccant Cooling System Driven by Renewable Energy of Photo-Voltaic Effect

  • Kim, Myoung-Jun;Yu, Jik-Su
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.32 no.3
    • /
    • pp.387-393
    • /
    • 2008
  • This paper has dealt with the probability of oyster shell desiccant cooling system driven by renewable energy of photo-volatic effect with fundamental experiment. The test materials for desiccant are activated charcoal, silica-gel, hi-dry, and oyster shell. The experiments were mainly performed with focusing on the observation of surface features, adsorption amounts of the adsorbent species, and the effect of temperature. Oyster shell has sufficient probability for using as desiccant in a air-conditioning system. Moreover, the heat releasing device would be attached in the system, the system based with oyster shell can be operated with high efficiency.

The Submerged Biofilm Process using Oyster-Shell Media for Wastewater Treatment and Prediction (굴패각을 담체로 사용한 침적고정 생물막공법 및 예측)

  • 문병현;이택순
    • Journal of Environmental Science International
    • /
    • v.6 no.6
    • /
    • pp.671-678
    • /
    • 1997
  • This study was conducted to use oyster shell as media for biological wastewater treatment. The comparison between the removal efficiencies of the activated sludge and the submerged biofilm process with oyster shell media (5% of reactor volume) for domestic sewage treatment was made. The contaminant removal efficiencies of the submerged process were higher than that of the activated sludge process. And the removal efficiencies of the submerged biofilm process with oyster shell media of 10% and 18% were Investigated at various loading rate. The removal efficiencies of 10% were higher than that of the 18% during the experimental period. The effluent concentration from the sub- merged bloom process using oyster shell media was prediceted by the Stover-Kincannon model.

  • PDF

Oyster Shell waste is alternative sources for Calcium carbonate (CaCO3) instead of Natural limestone

  • Ramakrishna, Chilakala;Thenepalli, Thriveni;Nam, Seong Young;Kim, Chunsik;Ahn, Ji Whan
    • Journal of Energy Engineering
    • /
    • v.27 no.1
    • /
    • pp.59-64
    • /
    • 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.

Studies on the Adsarption Characteristics of Fluoride Ion-Containing Wastewater by Employing Waste Oyster Shell as an Adsorbent (폐굴껍질을 흡착제로 한 불소폐수 처리특성에 관한 연구)

  • Lee, Jin-Suk;Kim, Dong-Su
    • Journal of Korean Society on Water Environment
    • /
    • v.23 no.2
    • /
    • pp.222-227
    • /
    • 2007
  • The adsorption features of fluoride ion on the oyster shell have been investigated for the purpose of the employment of waste oyster shell as an adsorbent for the treatment of fluoride ion-containing wastewater. The major component of oyster shell was examined to be Ca with minor components of Na, Si, Mg, Al, and Fe. As the initial concentration of fluoride ion was raised, its absorbed amount was enhanced at equilibrium, however, the adsorption ratio of fluoride ion compared with its initial concentration was shown to be decreased. Also, adsorption of fluoride ion onto the oyster shell resulted in the formation of $CaF_2$ in the morphological structure of adsorbent. Kinetic analysis showed that the adsorption reaction of fluoride ion generally followed a second order reaction with decreasing rate constant with the initial concentration of adsorbate. Freundlich model agreed well with the adsorption behavior of fluoride ion at equilibrium and the adsorption reaction of fluoride ion was examined to be endothermic. Several thermodynamic parameters for the adsorption reaction were calculated based on thermodynamic equations and the activation energy for the adsorption of fluoride ion onto oyster shell was estimated to be ca. 13.589 kJ/mole.

Characteristics of Crushed Oyster-shell as a Substitute of Sand for Sand Compaction Pile (모래다짐말뚝(SCP) 재료로서 파쇄 굴패각의 특성조사)

  • 윤길림;윤여원;채광석;권오순
    • Journal of the Korean Geotechnical Society
    • /
    • v.19 no.5
    • /
    • pp.281-290
    • /
    • 2003
  • In order to investigate recycling possibility as a construction material of oyster-shells, the geotechnical characteristics including permeability, confined compression and shear strength of crushed oyster shell were quantitatively examined in terms of fineness modulus and relative density of crushed oyster-shell. Experimental results show that the crushed oyster-shells are lighter than sand in weight, and have similar characteristics on permeability and shear strength to sandy soils. The oyster-shell can be considered as highly crushable material but not much crushable with existing high loads. Based on the laboratory test results, it is highly fudged that the crushed oyster-shell can be a substitute of sand as SCP materials.

Estimation of Genetic Parameters and Breeding Value for Measurement Traits of Pacific Oyster Crassostrea gigas at Nine Months Old (9개월령 참굴의 계측형질에 대한 유전모수 및 육종가 추정)

  • Park, Ki-Yeol;Kim, Hyun-Chul;Kim, Byoung-Hak;Choi, Nack-Joong;Moon, Tae-Seok
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.42 no.6
    • /
    • pp.600-603
    • /
    • 2009
  • Genetic and phenotypic parameter estimates for measurement traits were obtained from pacific oyster Crassostrea gigas at nine months old. For the growth-related traits among nine months old pacific oyster, heritabilities of shell length, shell height, shell width, total weight, body weight and shell weight were estimated as 0.4855, 0.5248, 0.0884, 0.7236, 0.7726 and 0.6957, respectively. Genetic correlations among the growth-related traits of pacific oyster at nines month old, shell length, shell height, shell width, total weight, body weight, shell weight were showing highly positive correlations. Breeding value on growth-related traits of pacific oyster at nine months old were estimated as shell length -7.044-11.870, shell height -11.380-18.370, shell width -1.234-2.831, total weight -8.339-17.140, body weight -1.813-3.507 and shell weight -4.422-8.837. The results show that there is quite substantial additive genetic variance for measurement traits in pacific oyster that can be exploited through selective breeding.

Experiments of Oyster-shell Mixed with Sand for Sand Compaction Pile (모래다짐말뚝(SCP) 지반개량을 위한 굴패각-모래 혼합토 실험연구)

  • Yoon, Gil-Lim;Yoon, Yeo-Won;Chae, Kwang-Seok;An, Young-Chon
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • /
    • pp.162-169
    • /
    • 2004
  • In order to investigate a recycling possibility as a construction material of oyster-shells, the geotechnical characteristics including N-value, confined compression and shear strength for oyster shell mixed soils were quantitatively examined. Experimental results show that the oyster shell mixed soils are lighter than sand in weight, and have similar characteristics of shear strength with sandy soils. Based on the experimental results, it is highly judged that crushed oyster-shell can be a substitute of sand as the SCP method.

  • PDF

Evaluation of strength of waste material mixed concrete using digital image (디지털이미지를 이용한 폐기물 혼합 콘크리트의 강도 평가)

  • Yoon, Hyun-Suk;Lee, Ki-Ho;Park, Jun-Boum
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • /
    • pp.1390-1395
    • /
    • 2005
  • To analyze the effects of oyster shell particles, inserted in the self-hardening matrix such as cement paste, on strength, homogenization analysis using micro structure was used to estimate and assess the apparent elastic modulus of oyster shell particle. DIB modeling technique was used to represent of the micro structure of oyster shell mixed concrete. The results showed that the apparent elastic modulus of LOS (large oyster shell particle) was changed with the amount of LOS inserted. In particular, when the amount of LOS was 200% of the weight of cement, the apparent elastic modulus of LOS tended to decrease rapidly. This could mean that the strength of oyster shell mixed concrete is much affected by LOS inserted material in mixed ratio of 200%.

  • PDF

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

  • Yu, Kwang Sun;Thriveni, Thenepalli;Jegal, Yujin;Whan, Ahn Ji
    • Journal of Energy Engineering
    • /
    • v.26 no.1
    • /
    • pp.62-67
    • /
    • 2017
  • 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.

A brief review on Oyster shells origin and sedimentary evolution for the formation of limestone

  • Ramakrishna, Chilakala;Thriveni, Thenepalli;Whan, Ahn Ji
    • Journal of Energy Engineering
    • /
    • v.27 no.3
    • /
    • pp.48-56
    • /
    • 2018
  • The shell waste biomineralization process has known a tremendous metamorphosis and also the nanostructure with the identification of matrix proteins in oyster shells. However, proteins are represented in minor shell components and they are the major macromolecules that control biocrystal synthesis. Aragonite and calcite were derived from molluscan shells and evaluated the source of carbonate minerals and it helps for the formation of limestone. The oyster shell wastes are large and massive. The paleoecological study of oyster beds has discovered a near-shore and thin Upper Rudeis formation with storm influence during the accumulation of oysters with highly altered by disarticulation, bioerosion, and encrustation. It is possible even in the Paleozoic mollusks provided sufficient carbonate entirely to the source of microcrystalline of limestone. The present review is to discuss paleoecologically a number of oyster shell beds accumulated and sediment to form the different types of limestone during the Middle Miocene time.