• Journal of the Korean GEO-environmental Society
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• v.17 no.11
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• pp.23-33
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• 2016

This study evaluated the stability and deformation subsea foundation after implementation of the contaminant isolation method by covering the contaminated materials using Zeolite and sands under subsea condition. The appropriate contaminant adsorption materials used in this study was selected as Zeolite based on the existing research results due to its efficiency. Safety (or stability) was evaluated by calculation and to analyze deformation after completing the contaminant isolation method. The minimum safety factors from slope stability analyses results were 30.1 and 11.2 depending on subsea submerged conditions and the amount of the maximum primary consolidation settlement from consolidation analysis results was 209.2 mm. In addition, change of consolidation amount with increasing consolidation time was evaluated based on consolidation degree.

• Resources Recycling
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• v.7 no.5
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• pp.13-18
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• 1998

This study was carried out to understand the properties of the E.A.F. steel-making dusts for stabilization processing. The properties are related to mincral composition, shape, particle size, magnetism, density, porosity and leaching characteristic. the dust particles, the size of which ranges from sub-micron to tens-micron, were mainly spherical like balls that were agglomerated each other: the large particles were generally Fe-rich and the small particles were spherical like balls that were agglomerated each other: the large particles were franklinite (ZnFe$_{2}O_{4}$), magnetite (Fe$_{3}O_{4}$) and zincite (ZnO) by XRD analysis. When the dusts were sieved by a wet process, the particle fraction over 200 mesh had 1.5 wt.% with magnetite and quartz. The particles in the size range of 200-500 mesh consisted of magnetite, franklinite. The 82 wt.% of the steel-making dusts were occupied by the particles finer than 500 mesh and contained franklinite and zincite as main mineralogical compositions. When the dusts of around 78% porosity compressed under the load of approximately 1 KPa, the porosity decreased to 68% and to 535 under around 13 KPa. When the E.A.F. dusts were leached according to the Korea standard leaching procedure on the waster, the heavy metals exceeding the leaching criteria were cadmium, lead and mercury.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.185.2-185.2
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• 2011

1900년대 이후 산업발전에 따른 인구의 도시 집중화로 인한 하수량 증가에 따라 하수슬러지 발생량이 점차 증가하게 되면서 하수슬러지 처리에 관한 문제 등이 제기되기 시작하였다. 국내의 경우 2003년 하수슬러지의 매립이 금지된 후, 발생슬러지 대부분을 해양투기 등을 통해 처리하여왔다. 2009년 기준으로 국내에서 발생되는 하수슬러지량과 처리 분포를 살펴보면 전국 433개소 하수처리장에서 1일 평균 8,295톤(3,028천톤/년)이 발생되고 있으며, 이 중 47%가 해양투기 되고 있는 실정이다. 그러나 해양투기마저도 런던협약'96의정서 가입으로 2012년부터 금지됨에 따라 국내에서는 슬러지처리 및 재활용 방안과 관련한 연구개발이 활발히 진행되고 있는 중이다. 하수슬러지 처리 및 재활용기술의 경우 다양한 공법 등이 개발 중에 있으나 설비의 불안정 및 높은 투자비 등으로 인해 아직까지 상용화 된 설비 등은 많지 않은 실정이다. 이에 따라 본 연구에서는 POSCO 건설에서 개발한 슬러지 연료화 기술을 통해 생산된 슬러지 탄을 석탄 화력발전소 등에 석탄 보조연료로 활용할 수 있는 방안을 강구하여 상용화 가능한 혼소 기술을 개발하고자 하였다. 슬러지탄(발열량 3.000kcal 이상)을 석탄 화력발전소 보일러에 일정 비율로 혼소하여 슬러지탄의 품질평가, 중금속 용출시험 및 함량분석, 잔재물의 중금속 용출시험 등을 실시하였으며, 그 결과 모든 시험항목에서 연료화 관련 법적기준을 만족하는 것으로 나타났다. 슬러지탄을 화력발전소에 혼소하여 사용할 경우, 2012년부터 시행예정인 RPS(Renewable Portfolio Standard)법 대응 및 석탄사용량 저감 등을 통한 $CO_2$ 저감으로 저탄소 녹색성장의 자원순환사회를 구축하는 데 이바지 할 것으로 판단된다.

• Journal of fish pathology
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• v.14 no.2
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• pp.59-64
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• 2001

A complementary DNA encoding metallothionein(MT), a heavy metal-responsive protein was cloned from a cartilaginous shark species. Scyliorhinus torazame. An expressed sequence tag(EST)from the shark liver, which showed high similarity with a MT gene, was isolated and its full-length sequence(390bp)was determined. The putative shark MT cDNA sequence contained an open reading frame consisting 68 amino acids and 182bp of 3-untranslated region including the poly (A+) signal. The deduced amino acid sequence was 41-54% identical to those of other animals including mammals and fish species. Tiger shark MT cDNA showed high conservation in the Cys regions. however, peculiarly contained not only additional five amino acids just prior to the conserved beta-domain but also a Ser residue at C terminal, which has not been seen in other MT sequences.

• Microbiology and Biotechnology Letters
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• v.39 no.2
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• pp.182-187
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• 2011

In this study, A bacterium with an ability to resist toxic heavy metals was isolated from reeds in wetland. The isolated strain was identified to Alcaligenes sp. KC-1 by 16S rDNA sequencing. Heavy metals such as Pb, $Cr^{6+}$, Cd, Zn and Cu were supplied to media. The ecotoxic treat of the heavy metals on the growth of strain KC-1 was performed when the isolated strain Alcaligenes sp. KC-1 cultured with Cu ranging from 0 mM to 20 mM. It showed the resistance of $EC_{50}$(7.34 mM) and cell growth ($OD_{600\;nm}$ : 0.83 after 42 hours) when it was cultured in Cu.

• The Journal of Natural Sciences
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• v.5 no.2
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• pp.19-24
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• 1992

To find out the extent of air pollution in Taejon city, we investigated the concents of heavy metals in barks of trees in principal roadside, the outer block of a roadside and Pomunsan Park. Among the road-side trees in these areas, Platanus orientalis, Ginkgo biloba and Liriodendron tulipifera have been chosen. And we analyzed the relationship between the content of heavy metal of the barks and the traffic volume expressed by cars passing through for an hour. The range of contents of the lead in barks of the trees in the roadside and Pomunsan Park were respectively 2-1109 ppm and 5-11 ppm. Generally the contents of lead of barks of the trees in roadside was much higher than that in Pomunsan Park. And there has been positive correlation between the traf-fic volume and the content of lead in the barks. The more cars passing through for an hour, the higher the maximum in contents of lead in the barks of roadside trees. By the way the contents of cadmium in barks of the roadside trees was slightly higher than that in Pomunsan Park and was little variable.

• Journal of the Korea Organic Resources Recycling Association
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• v.10 no.1
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• pp.61-67
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• 2002

Sawdust, peat, and sawdust+peat were used as bulking agent in the compost production process using three different origin of manure; cow, pig, and chicken. The organic content and individual N, P, K content of the final manure compost were higher when peat or peat+sawdust were used to control the moisture. The carbon to nitrogen ratio and moisture content were low when peat or peat+sawdust were employed. In the case of cow and pig manure compost produced with peat or peat+sawdust, beneficial microorganism content was also higher than that of the manure samples produced with sawdust only. These results indicate that peat can be a useful component in the production of high quality manure compost.

• Journal of Life Science
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• v.15 no.1 s.68
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• pp.94-99
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• 2005

Sixty four bacterial colonies which were able to oxidize the manganese were isolated from soil samples in Mokcheon and Ochang area. Among them, one bacterial strain was selected for this study based on its higher manganese oxidation, and this selected bacterial strain was identified as Aeromonas sp. MN44 through physiological-biochemical test and analysis of its 16s rRNA sequence. Aeromonas sp. MN44 was able to utilize lactose but did not utilize various carbohydrates as a sole carbon source. Aeromonas sp. MN44 showed a very sensitive to antibiotics such as kanamycin, chloramphenicol, ampicillin, tetracycline and spectinomycin, and heavy metal such as cadmium. But this strain showed a high resistance up to mg/ml unit to heavy metals such as lithium and manganese. Optimal manganese oxidation condition of Aeromonas sp. MN44 was pH 7.4 and manganese oxidation activity was inhibited by proteinase K and boiling treatment. So, we concluded that this factor was protein. The manganese oxidizing factor produced by Aeromonas sp. MN44 was partial purified by ammonium sulfate precipitation, DEAE-Toyopearl 650M ion exchange chromatography and Sephadex gel filtration chromatography. Its molecular mass was about 113 kDa.

• Journal of Navigation and Port Research
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• v.38 no.6
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• pp.601-606
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• 2014

Lab scale experiment study was carried out for biological treatment process development in shipboard. SBR(Sequence Batch Reactor) process with BM(Beneficial Microorganisms) was investigated for practical application on shipboard sewage treatment. From the results it was suggested that SBR process with BM might be a suitable process in terms of harmful materials removal. By adding BM to SBR system, the useful species of microorganisms and EPS(Extracellar Polymetric Substances) in sludge was increased. It was found that the biodegrability and harmful organic compounds like VOCs and harmful inorganic compounds like heavy metals. was reduced over 70%. As far as reclamation water is considered, this process is very advantageous to special environments such as cruise ships, because the method of adding BM makes it unnecessary to add other facilities on the SBR system.

• Korean Journal of Food Science and Technology
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• v.7 no.1
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• pp.1-6
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• 1975

The changes of heavy metal amounts (Sn, Pb and Fe) in the Commercial white peach can between lacquered and plain can were investigated according to storage period which indicated as follows. 1. Lacquered and plain can, both of can got on increasing on all of heavy metal with expanding storage period. 2. Lacquered can showed that the heavy metal were on the decreased than plain can, while amounts of tin was considerably decreased. 3. Amounts of iron was proportionally increased with the increasing of detinning amounts. 4. Amounts of hazardous metal in all of the 6 commercial products were not reached at harmfull level of Korean food sanitation law.