• 한국환경보건학회지
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• 제30권5호
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• pp.395-401
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• 2004

In this study, lots of methods have been studing to utilize energy and decrease contaminated effluents. There has been great progress on IGCC (Integrated gasification combined cycle) to reduce thermal energy losses. The following results have been conducted from desulfurization experiments using waste shell to remove $H_{2}S$. Unreacted core model ior desulfuriration rate prediction of sorbent was indicated. These were linear relationship between time and conversion. So co-current diffusion resistance was conducted reaction rate controlling step. The sulfidation rate is likely to be controlled primarily by countercurrent diffusion through the product layer of calcium sulfide(CaS) formed. Maximum desulfurization capacity was observed at 0.631 mm for lime, oyster and hard-shelled mussel. The kinetics of the sorption of $H_{2}S$ by CaO is sensitive to the reaction temperature and particle size at $800^{\circ}C$, and the reaction rate of oyster was faster than the calcined limestone at $700^{\circ}C$.

• 한국지반공학회논문집
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• 제19권5호
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• pp.243-252
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• 2003

저투수성 오염토양을 정화하기 위한 방안으로 환경이중파일 공법을 제안하였다. 환경이중파일은 저투수성 오염지반에 적용되어 배수촉진, 오염정화, 말뚝에 의한 지반지지력 증가의 복합적인 기능을 수행하여 부지를 재활용할 수 있도록 하는 One Step Process 개념의 신기술이다. 기술의 현장적용성을 평가하기 위해 환경이중파일의 배수, 강도, 정화특성을 일련의 실험 등을 통해 평가하였으며, 정화 및 연약지반개량 효과를 얻을 수 있음을 확인할 수 있었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.379-380
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• 2005

• The Plant Pathology Journal
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• 제16권5호
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• pp.283-285
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• 2000

Two field tests were conducted in 1995 to examine the effects of composts and soil amendments on physicochemical properties of soil in relation to Phytophthora root and crown rot of bell pepper. Chitosan, crab shell waste, humate, sewage sludge-yard trimmings, and wood chips were applied to test plots, some of which affected the levels of P, K, Mg, pH, and H. Physicochemical properties were not related with disease incidence, but percent organic matter, estimated nitrogen release, K, and Mg were correlated with total microbial activity. The elements K and Mg were especially responsible for the increased soil microbial activity that could affect development of root and crown rot of pepper.

• 한국환경보건학회지
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• 제22권3호
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• pp.81-87
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• 1996

The purpose of this research is to examine the utilization of oyster shells for neutralization and removal of heavy metal ions in plating wastewater, because oyster shells have been known to be very porous, to have high specific surface area and to have alkaline minerals such as calcium and magnesium. The results obtianed from this research showed that oyster shells had a buffer capacity to neutralize an acidic.alkali system in plating wastewater. Generally, it could be showed that the removal efficiencies of heavy metal ions were very influenced by reaction times and oyster shell dosages. In point of ocean waste, if oyster shells substituted for a valuable adsorbent such as actviated carbon, they could look forward to an expected economical effect.

• 한국재료학회지
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• 제14권2호
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• pp.157-162
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• 2004

The object of this research is to develop a carbon molecular sieve(below CMS) which can separate selectively to convert mixture gases spout at waste landfill into fuel. And this research is meaningful from the viewpoint of a quality improvement of CH$_4$ gas and an utilization of by-product. CMS was prepared using coconut shell powder as starting material and the effects of activators, temperature and modifier on the reaction were investigated in this research. Also, pore diameter, surface area of CMS and adsorption rate were measured and studied by cahn balance and ASAP2010. Its specific surface area and pore distribution were controlled easily at 800^{\circ}C and adsorption rate was very good. The CMS prepared in this research is shown to be able to separate landfill gases very effectively.

• 한국산학기술학회논문지
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• 제7권5호
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• pp.935-939
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• 2006

The environmentally benign inorganic bacterioide was developed by using waste shell as a matrix and its efficacies against various bacteria were examined in this investigation. The inorganic bacteriocide inhibited strongly the growths of various bacteria such as S. aureus and E.coli. The inorganic bacteriocide also showed strong killing effect on the growth of P.acnes which causes the acne on human face. Moreover, this bacteriocide inhibited the activity of lipoxygenase prominently, indicating notable anti-inflammatory activity of the bacteriocide.

• 대한환경공학회지
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• 제30권11호
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• pp.1116-1122
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• 2008

기존의 하수슬러지 소각재를 용융하여 경량 골재로 재활용하는 기술은 물성이 일정하지 않으며, 또한 하수슬러지만 소각 용융한 경우에는 물성이 경량골재 기준을 만족하지 못해 사용이 제한적인 실정이다. 따라서 본 연구에서는 30%의 함수율을 가진 건조 하수슬러지를 대상으로 굴 패각, 폐 주물사, 쇠의 녹과 같은 무기성 폐기물 첨가제를 이용해 CaO/SiO$_2$, SiO$_2$/Al$_2$O$_3$, Fe$_2$O$_3$/SiO$_2$비를 조절하여 낮은 용융온도에서도 균일한 품질의 골재용 슬래그를 생산하고자 하였다. 1,400$^{\circ}C$에서 20분간 용융하였을 때, 굴패각 첨가실험에서는 CaO/SiO$_2$ 비 1.00, 폐 주물사 첨가 실험에서는 SiO$_2$/Al$_2$O$_3$ 비 3.0 그리고 쇠의 녹 첨가 실험에서는 Fe$_2$O$_3$/SiO$_2$비 0.6에서 밀도가 각각 2.24 g/cm$^3$, 2.45 g/cm$^3$, 2.73 g/cm$^3$였으며, 24시간 수 흡수성은 각각 4.72%, 1.44%, 0.37%로 가장 우수한 슬래그 생산이 가능한 것으로 판단되었다. 폐기물 첨가제를 첨가한 용융슬래그를 생산함으로써 자원순환 및 환경오염 방지 효과가 기대된다.

• 한국토양비료학회지
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• 제47권6호
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• pp.443-450
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• 2014

To determine Pb species in soils following the immobilization process, sequential extraction has been used despite the possibility of overestimating Pb species from unintended reactions during chemical extraction. Meanwhile, the application of extended X-ray absorption fine structure (EXAFS) has been shown to provide a more precise result than chemical extraction. In this study, the immobilization of Pb in contaminated soils treated with liming materials such as oyster shell (OS) or eggshell (ES) was evaluated with thermodynamic modelling and EXAFS analysis. Thermodynamic modelling by visual MINTEQ predicted the precipitation of $Pb(OH)_2$ in OS and ES treated soils. In particular, the values of saturation index (SI) for $Pb(OH)_2$ in OS (SI=0.286) and ES (SI=0.453) treated soils were greater than in the control soil (SI=0.281). Linear combination fitting (LCF) analysis confirmed the presence of $C_{12}H_{10}O_{14}Pb_3$ (lead citrate, 44.7%) by citric acid from plant root, Pb-gibbsite (Pb adsorbed gibbsite, 26.4%), and Pb-kaolinite (Pb adsorbed kaolinite, 20.3%) in the control soil. On the other hand, $Pb(OH)_2$ (16.8%), Pb-gibbsite (39.3%), and Pb-kaolinite (25.6%) were observed in the OS treated soil and $Pb(OH)_2$ (55.2%) and Pb-gibbsite (33.8%) were also confirmed in the ES treated soil. Our results indicate that the treatment with OS and ES immobilizes Pb by adsorption of Pb onto the soil minerals as a result of the increase in soil negative charge and the formation of stable $Pb(OH)_2$ under high pH condition of soils.

• International Journal of Industrial Entomology and Biomaterials
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• 제14권1호
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• pp.15-21
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• 2007

Three newly authorized bivoltine silkworm hybrids namely, $CSR2{\times}CSR4$ (productive single hybrid), $(CSR6{\times}CSR26){\times}(CSR2{\times}CSR27)$ (productive double hybrid) and $CSR18{\times}CSR19$ (robust single hybrid) were chosen for the present study. These hybrids were subjected to different temperature and humidity treatments i.e., $25{\pm}$1^{\circ}C and RH $65{\pm}5%$ (control), $30{\pm}1^{\circ}C$, with combinations of low relative humidity (RH $65{\pm}5%$) and high RH ($85{\pm}5%$) at different stages during rearing and spinning of silkworm larvae. The larvae of after 3rd moult were subjected to different thermal and humidity stress till the assessment of cocoon traits. The comparative rearing and reeling performance clearly indicated that the deleterious effect of high temperature and high RH was more pronounced for the majority of traits such as cocoon uniformity, cocoon weight, shell weight, shell percentage, reelability, filament length, raw silk percentage raw silk recovery denier and waste percentage on silk weight than other temperature and RH treatments and this effect was almost similar for all three silkworm hybrids studied. The present investigation clearly indicate that the deleterious effect of high temperature and high RH was more pronounced on rearing and spinning of silkworm larvae than other temperature and RH treatments and similar effect was noticed for all the three silkworm hybrids studied. The cocoon characters can be improved by providing ideal environmental conditions even during spinning stage of larvae affected with high temperature and RH. The study also suggest that high temperature and low humidity has greater effect during rearing stage than spinning stage.