• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.266-268
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• 2004

대부분의 유기물은 토양의 특성에 따라 그 흡착 및 탈착 양상이 다르며 이는 오염물질의 토양에서의 지속성 및 이동성에 영향을 미치게 된다. 본 연구에서는 대표적인 유기오염물인 PAH(Polycyclic Aromatic Hydrocarbon)에 대하여 흡착 및 탈착과 오염물질의 미생물 분해 등을 통한 제거 기작과의 연관성을 연구하고자 한다. PAH의 이론적인 미생물분해반응식은 열역학적 이론을 바탕으로 하는 반쪽반응방법을 사용하여 예측할 수 있다. 오염물과 토양의 특성에 따른 흡착 및 탈착 양상을 파악하고, 앞에서 구한 미생물 분해반응식을 이용하여 이론적 분해량을 예측하면 오염물의 생물학적 이용성과 노출량을 결정할 수 있다 이를 위하여 본 연구에서는 토양의 여러 특성을 분석한 후, PAH의 미생물 분해량 및 분해율을 측정하고자 한다. 실험을 통하여 실제 토양에서 측정된 PAH 분해량과 위의 이론적 분해량 예측 결과 사이의 관계를 토양의 특성을 이용하여 설명할 수 있으며 나아가 오염물질의 생물학적이용성에 관하여 개략적으로 일반화된 예측 모형을 얻을 수 있을 것이다. 본 연구를 통하여 토양과 유기오염물질, 미생물간의 상호 작용에 대한 이해를 높이고 보다 실질적인 유기오염물의 생물학적 이용성을 예측할 수 있는 방안을 마련할 수 있을 것이다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.3B
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• pp.303-310
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• 2009

Natural zeolite is widely used as sorbents and bio-media materials because it is cheap as well as it has efficient porous structures and large cation exchange. In this study, the effect of metal cations $(Na^+,\;Ca^{2+},\;Mg^{2+},\;Al^{3+})$ adsorbed to natural zeolite on the microorganism attachment was investigated. Metal-modified zeolites (MMZ) were prepared with 0.01 M, 0.02 M and 0.1 M NaCl, $CaCl_2$, $MgCl_2$ and $AlCl_3$ solutions respectively, which concentrations were equivalent to 10%, 20% and 100% of cation exchange capacity (CEC) of natural zeolite. Pseudomonas putida was used as microorganism which was cultivated in Beef Extract Medium at $26^{\circ}C$. The microorganism attachment to MMZ was increased more than natural zeolite. The amount of bacterial adhesion to MMZ and natural zeolite were $Mg^{2+}>natural>Na^+>Al^{3+}>Ca^{2+}$ under 10% of CEC, $Mg^{2+}>Ca^{2+}>Al^{3+}>natural>Na^+$ under 20% of CEC and $Ca^{2+}>Mg^{2+}>natural>Al^{3+}>Na^+$ under 100% of CEC. Especially, Mg-modified zeolite (Mg-MZ) showed the highest amount of bacterial adhesion, which increased the microorganism attachment 60% higher than natural zeolite under 10% of CEC. However, the amount of bacterial adhesion was decreased as the concentration of metal cations modified to zeolite were increased, showing that the increased amounts were 60% under 10% of CEC, 50% under 20% of CEC and 10% under 100% of CEC in Mg-MZ. Additionally, the effect of $Mg^{2+}$ in solution on the bacterial adhesion was investigated in order to compare it with the effect of $Mg^{2+}$ adsorbed to zeolite. The maximum quantity of bacterial adhesion to Mg-MZ was not different from the amount of microorganism attachment to the natural zeolite when $Mg^{2+}$ solution was added.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.685-688
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• 2001

We prepared D,L-phenylalanine imprinted membrane by a wet phase method. Template was imprinted in the step of copolymerization or implanted by mixing template and DMSO solution containing copolymer. The adsorption selectivity of each membrane was investigated.

• Proceedings of the Korean Fiber Society Conference
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• 1998.04a
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• pp.338-341
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• 1998

악취의 주원인은 염기성 취기의 대표인 암모니아, 산성 취기의 대표인 황화수소, 그리고 트리메틸아민이며, 이들은 법정 악취물질로써 지정되어 있다$^1$. 이와 같은 악취를 없애는 소취기구는 활성탄 및 제오라이트 등과 같은 물질에 대한 물리적 흡착에 의한 것, 산화제 및 환원제에 의한 화학반응에 의한 것, 미생물 및 효소에 의한 생물학적 반응에 의한 것으로 대별되지만, 물리 흡착은 재방출의 문제가 있고 화학 및 생물학적 반응에는 소취성분 자체의 유해성 및 반응후 물질의 유해성이 문제가 되는 경우가 있다.(중략)

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1997.11a
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• pp.57-60
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• 1997

양액재배용 고형배지로서 Rockwool 이나 Perlite둥이 사용되고 있다. 이는 농가 경제적 부담이 클 뿐만 아니라, 사용후 폐기시에도 환경보존의 문제점이 있다. 양액재배용 고형배지로 활용할 경우 공극이 많아 가볍고 수분 보유량과 통기성이 좋은 이점도 있으나 화산쇄설물의 일종으로 양분을 흡착하거나 송이가 함유하고 있는 성분들을 방출하는 특성이 있는 것으로 예상되나 확실한 조사가 되어있지 않다. (중략)

• Food Engineering Progress
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• v.13 no.2
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• pp.138-146
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• 2009

The crude polysaccharide fraction from fruit body of Auricularia auricula were obtained by using hot water extraction and ethanol precipitation. As the crude polysaccharide fraction contained the brownish dark colored compounds, the adsorption study of pigments from the crude polysaccharide using activated carbon was carried out. The pigment compounds showed an absorption characteristic with $\lambda_{max}$ of 230 nm and the absorbance at 230 nm was taken as color intensity. Adsorption capacity of pigment depended on increase of the activated carbon to sample loading ratio. The adsorption capacity increased with increase of pH and temperature in the pH range of 3.0-7.0 and temperature range of 25-40$^{\circ}C$, but decreased in the temperature range of 40-70$^{\circ}C$. The optimum capacity was obtained at addition of 16.7 mg activated carbon per mL sample solution (concentration = 3 mg/mL) at pH of 7.0 and temperature of 40$^{\circ}C$. Treatment for 10 min was sufficient to achieve the 80% decolorization and 1.25 fold purification of polysaccharide. Langmuir isotherm and pseudo second-order kinetic model provided the best fitting for adsorption of the brownish dark colored compounds onto powdered active carbon. The activation energies of adsorption from the Langmuir isotherm parameter in the ranges of 25-40$^{\circ}C$ and 40-70$^{\circ}C$ was -2.54 and 4.38 kcal/g, respectively. The results of low activation energy also indicated that the adsorption process was a physical adsorption which was controlled by diffnsion.

• Journal of Environmental Policy
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• v.13 no.2
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• pp.65-98
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• 2014

Plastics of the marine environment are broken gradually down into smaller particles by chemical weathering, called "microplastic". Microplastics absorb organic pollutants that are persistent bioaccumulative substances. If marine animals ingested microplastic added to contaminant, it will lead to a bioaccumation through the food web. It eventually destroy health of marine environment and is harmful to marine top predators including humans. Also, Microplastics can impact marine animals by leaching the endocrine disruptor in microplastic itself as well as playing an adsorbent role of organic pollutants. Persistent and bioaccumulative substances in Korea have been regulated in terms of chemical risk but existing regulations largely have been limited in land-based source management of microplastic. Thus, the harmful impact will be increased whether the microplastics absorbed contaminants. To prevent risk of persistent bioaccumulative substances, this study suggests the following: (1) the strict management of microplastic by designating the hazardous substances, (2) expand the use of biodegradable plastic, (3) the effort for reuse and recycle, (4) the expand of microplastic clean-up programs.

• Journal of Korea Soil Environment Society
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• v.2 no.2
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• pp.61-72
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• 1997

This research aims to remove the heavy metals, nonbiodegradable COD(NBDCOD), and color using the coal waste. The experimental by heat treatment was performed to advance the adsorption capacity. The results are as follows ; i) The coal waste had the adsorption capacity of heavy metals and the rates were in the range of 20 to 30 percents. ii) The heat treatment was the optimum condition that the reaction time was 6 hours at $500^{\circ}C$, , iii) In the column experimen, non-treated coal waste removed the COD and color in the range of 20 to 60 percents. iv) Heat-treated coal waste showed higher removal rate of the color in biological effluent, and heavy metal and COD removal rates were changed by the filteration rates.

• Journal of the Korean Magnetics Society
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• v.16 no.6
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• pp.293-299
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• 2006

Magnetic nanoparticles were prepared by thermal decomposition and adsorbed with lecithin by applying ultrasonic. The size and saturation magnetization of magnetic nanoparticles were observed with different lecithin concentration, and the maximum tolerated dose (HTD) and toxicity of magnetic fluid was investigated through a biological test. The thickness of lecithin-adsorption layer increased non-linearly with increasing amounts of added lecithin, and the desirable adsorption amount was observed in the lecithin concentration of 20%(w/v). The dispersibility and magnetic properties of lecithin-adsorbed magnetic nanoparticles were most excellent when the ultrasonic exposure time was 1.5h. Also, the maximum tolerated concentration with best cell viability was $32{\mu}g/ml$ in vitro test, and lecithin-adsorbed magnetic fluids improved the biocompatibility by 1.2 times compared with bare magnetite fluids in vivo.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.6
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• pp.318-324
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• 2017

We evaluated geosmin and MIB biodegradation and adsorption mechanism of biological activated carbon (BAC) and anthracite biofilter. In steady state of BAC process, the geosmin and MIB were completely removed at the 30 min empty bed contact time (EBCT) even though low water temperature ($9^{\circ}C$) in which the activity of attached bacteria decreased. When the water temperature was $26^{\circ}C$, the microbial biomass and activity were higher at the upper layer of the biofilm than at $9^{\circ}C$, and the microbial biomass and activity decreased as the depth was deeper. This is because when the water temperature is high, the biodegradable organic matter (BOM) removal rate in the upper layer is high and the BOM amount that can't be supplied to the lower layer. The Removal rate of geosmin and MIB by BAC process did not show a significant difference compare to activity-inhibited BAC by treated with azide and the biofilter also removed the geosmin and MIB by biological action. It means geosmin and MIB could be removed by competitive relationship between adsorption and biodegradation.