• Proceedings of the KSEEG Conference
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• 2001.04a
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• pp.4-6
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• 2001

• Korean Journal of Food Science and Technology
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• v.40 no.1
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• pp.118-121
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• 2008

Guar gum, ${\kappa}$-carrageenan, alginic acid and chitosan were applied to pork as a model system, and evaluated as a substitute for inorganic polyphosphate, which is one of the essential additives in conventional meat processing. The tested materials did not alter the fat content or pH of the pork meat; however, they did affect water holding capacity and cooking loss significantly. The pork with added guar gum and ${\kappa}$-carrageenan exhibited lower cooking loss than the pork with added polyphosphate. Also, theses materials showed no negative coloring effect within the pork meat blends, which suggest the possibility for their application in final products. In addition, the pork processed with guar gum showed a similar emulsion stability to that with polyphosphate. Overall, guar gum and ${\kappa}$-carrageenan were confirmed as possible substitutes for inorganic polyphosphate.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.291-293
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• 2007

인산염을 이용한 구리 고정화 실험의 토양적용가능성을 평가하고자 액상반응실험과 고정화물의 재용출 실험을 수행하였다. 액상반응실험 결과 인산염과 알칼리제 1mole을 넣은 반응에서 99.9% 의 구리제거효율을 보였고 구리의 재용출 농도는 0.64mg/L로 초기농도인 1000mg/L보다 현저히 낮은 값을 나타내었다.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.321-322
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• 2009

when the polluted soil with heavy metal ions was solidified using magnesia-phosphate cement, heavy metal ions were rarely eluted. Furthermore, the results cf SEM-EDS analysis showed that heavy metal ions in polluted soil turns into insoluble solid solution by magnesia-phosphate cement, it come to have the effect to stabilize heavy metals.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.586-589
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• 2001

In this study, phosphate was produced through the solublization of hydroxyapatite and rock phosphate by Pantoea agglomerans, and it was examined the possibility of solublizing insoluble phosphate salt by immobilized P. agglomerans on Ca-alginate bead as support. 520mg/L of phosphate was solublized when P. agglomerans was cultured in HY meclium at $30^{\circ}C$, pH7, 100rpm, during 48hours culture. And solublized phosphate amount was 86.09mg/L when hydroxyapatite in the HY medium was exchanged to rock phosphate. In case of being used immobilized P. agglomerans. 740mg/L of phosphate was solublized in the HY medium, during 120hrs in the same condition. And 182mg/L of phosphate was solublized when rock phosphate was added instead of hydroxyapatite.

• Journal of Navigation and Port Research
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• v.36 no.6
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• pp.459-463
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• 2012

In the present study, experiments have been performed to investigate the effects of the type of adsorbent, pH, and ionic strength on the adsorption of nutrients (nitrate and phosphate in artificial solution) onto the dredged sediment from a coastal fishery. In addition, this study aims to evaluate the possibility of removing the nutrients from the water using the dredged sediment. In the adsorption experiments of the nutrients, the reactions were completed within 10 minutes using ${NO_3}^-$-N($100{\mu}M$, 10mM) and ${PO_4}^{3-}$-P($100{\mu}M$, 10mM). In the steady state, 61% and 77% of the initial amounts were removed respectively for $100{\mu}M$ ${NO_3}^-$-N and $100{\mu}M$ ${PO_4}^{3-}$-P. The thermal treatment of the dredged sediment at $900^{\circ}C$ was not helpful to increase the removal efficiencies of the nutrients. Additives such as CaO and MgO dropped the removal efficiency of ${NO_3}^-$ to 0%, but increased that of ${PO_4}^{3-}$ up to 98%. Adsorption isotherms of ${NO_3}^-$ and ${PO_4}^{3-}$ could be explained by the Freundlich equation ($R^2$>0.99). The adsorption reaction was little influenced by the pH and ionic strength. Based on the results showing short reaction time and considerably high removal efficiencies of the nutrients, it is proposed to apply the dredged sediment from a coastal fishery to removing nutrients such as nitrate and phosphate in the water.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.1
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• pp.136-142
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• 2007

Recent publications have paid attention on the utilization of solid reagents for the removal of substances causing eutrophication, in particular $PO_4^{3-}$ ions. The adsorption of dissolved inorganic phosphate on slag produced by the refining process of iron ore was fundamentally studied for suppressing the liberation of phosphate from wastewater. This study has been conducted in order to find a possibility to improve the phosphate removal and to evaluate the phosphate removal variation to form hydroxyapatite, when the converter slag is used for phosphate removal. The result shows that the converter slag can be applied to remove phosphate using Freundlich isotherm. The size of converter slag, $2{\sim}0.425 mm$ was more efficient than $2{\sim}4.75mm$ to remove phosphate. In particular, 1 mg/L of phosphate can be removed up to 80% of the initial concentration for the continuous column experiment.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.4
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• pp.241-248
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• 2009

A farming area located near an abandoned copper mine in GuPo-ri, Choongchung province is heavily contaminated with heavy metals such as As, Pb, Cd, Cu and Zn of which concentrations are higher than the values typically detected in Korean soil environment. In this work, laboratory and field studies were conducted to examine feasibility of using Ca-citrate-phosphate solution in stabilizing heavy metals in the polluted soils. In laboratory batch experiments with field soil, the addition of Ca-citrate-phosphate solution resulted in decrease of aqueous phase concentration of phosphate and improvement of heavy metal stabilization, compared to those for sterilized soil samples. This indicates that microbial uptake of phosphate may have provided positive effects on availability of phosphate toward heavy metal stabilization. According to microbial community analysis for the field experiment, the use of Ca-citrate-phosphate led to increased diversity of microbial populations, and strict anaerobic microorganisms such as Anaerofilum and Treponema became the most dominant populations in the solution-amended field experiments. These findings suggest that, when Ca-citrate-phosphate is used for heavy metal stabilization in soils, microbial processes may have important roles in improving the stabilization of heavy metals by providing reducing conditions to the treatment locations or/and by making phosphate available to heavy metal stabilization.

• Journal of Korean Society of Environmental Engineers
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• v.30 no.9
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• pp.907-912
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• 2008

In order to reduce the availability of dissolved inorganic phosphorus in surface water, lakes, and estuaries, black shale and zero valent iron can be used as reacitve materials. Sorption of phosphate to sampled sediment, black shale, and zero valent iron was quantitatively evaluated in this research. Effect of coexistence of calcium was also tested, since coexisting ions can enhance the precipitation of phosphate. An empirical kinetic model with fast sorption(k$_t$), slow sorption(k$_s$), and precipitation(k$_p$) was well fitted to experiment data from this research. Langmuir and Freundlich sorption isotherms were also used to evaluated phosphate maximum sorption capacity. Calcium ions at 0, 1 and 5 mM affected the precipitation kinetic coefficient in empirical kinetic model but did not have impact on the maximum sorbed concentration.

• Proceedings of the International Microelectronics And Packaging Society Conference
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• 2002.11a
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• pp.191-194
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• 2002

본 연구는 친환경재료로서 생체, 전자, 환경재료로서 관심이 증가하고 있는 인산염계 저융점 유리의 열적특성 및 결정화에 대한 연구를 진행하였다. $K_2$O-CaO-P$_2$O$_{5}$ 삼성분계 인산염 유리에 대해 P$_2$O$_{5}$ 함량이 40~60mo1% 범위의 조성을 선정하여 전통 용융법에 의해 제조하였으며, 제조된 유리의 전자 패키징 및 저온소결 첨가제용 frit으로의 적용 가능성을 평가하기 위한 기초 연구로서, DSC, TMA를 통해 열적특성을 평가하였다. 제조된 유리의 연화온도는 320-5$50^{\circ}C$였으며, 열팽창 계수는 26~60$\times$$10^{-6}$/$^{\circ}C$의 범위였다. 제조된 유리의 열분석 결과로부터 최적 결정화 온도를 조사하였으며, 결정화 유리를 제조하여 XRD을 통해 결정상을 조사하였다.