• Title/Summary/Keyword: waste-water

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Isolation of A Bacterial Strain Which Baa Specific Tolerance Against The Cadmium (카드뮴에 특이적(特異的)인 내성균(耐性菌)의 분리(分離))

  • Park, Chan-Sung;Choi, Kyoung-Ho
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.8 no.1
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    • pp.25-30
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    • 1979
  • A bacterial strain which showed a remarkable tolerance against cadmium was isolated from waste water and identified as a member of Staphylococcus aureus. Heavy metal ions, at the concentration of 10 ppm and other than cadmium, inhibited at least by 30 per cent of turbidometric growth of the organism. The organism exhibited a normal pattern of growth with increasing concentration of cadmium up to 50 ppm. However, they were unable to grow in the concomitant presence of cadmium higher than 500 ppm. In spite of the drastic growth inhibition of cadmium, the organism was able to grow even in the concomitant presence of 500 ppm cadmium when it was previously cultivated for 15 hours with exposing to 10 ppm cadmium or lead.

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Fruits Extracts Mediated Synthesis of Zinc Oxide Nanoparticles Using Rubus coreanus and its Catalytic Activity for Degradation of Industrial Dye

  • Rupa, Esrat Jahan;Gokulanathan, Anandapadmanaban;Ahn, Jong-Chan;Mathiyalagan, Ramya;Markus, Josua;Elizabeth, Jimenez Perez Zuly;Soshnikova, Veronika;Kim, Yeon-Ju;Yang, Deok-Chun
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2018.04a
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    • pp.93-93
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    • 2018
  • This study disclosed the aqueous fruits extract of Rubus coreanus as a sustainable agent for the synthesis of Rubus coreanus zinc oxide nanoparticle (Rc-ZnO Nps) using as a reducing and capping precursor for co-precipitation method. The development of Rc-ZnO was assured by white precipitated powder and analyzed by spectroscopic and analytical instruments. The UV-visible (UV-Vis) studies indicate the maximum absorbance at 357nm which confirmed the formation of ZnO Nps and the purity, functional group and monodispersity were assured by field emission transmission electron microscopy (FE-TEM), Fourier Transform Infrared (FTIR) Spectroscopy and dynamic light scattering (DLS). The X-ray powder diffraction (XRD) data revealed the Nps is 23.16 nm in size, crystalline in nature and possess hexagonal wurtzite structure. The Rc-ZnO Nps were subjected for catalytic studies. The Malachite Green dye was degraded by Rc- ZnO NPs in both dark and light (100 W tungsten) conditions and it degraded about 90% at 4 hours observation in both cases. The biodegradable, low cost Rc-ZnO NPs can be a better weapon for waste water treatment.

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A study on improvement of Investment Incentive Acts for Attracting Companies in Gangwon (강원지역 기업유치 활성화를 위한 지원제도의 개선방안에 관한 연구)

  • Park, Kon-Young;La, Kong-Woo
    • International Commerce and Information Review
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    • v.17 no.1
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    • pp.115-134
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    • 2015
  • Stable economic growth and job creation through the attracting companies is a major challenge for local governments. Companies are asked to select a place to invest and finally considering the conditions. Local governments will take advantage of a variety of incentives to attract companies the means to overcome the unfavorable position relative to conditions. Investment incentives should be applied differently depending on the investment objective, investment, corporate investment period. However, Local governments has developed a similar promotion activities through support under the same legal system. This does not result in a substantial investment activities. In this study, we derive the Introduction of differentiated support system for Gangwon Province. In particular, logistics and waste water treatment cost support, upward adjustment of training subsidies were looking for concrete improvements in the investment support system.

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Influence of Painting Materials based on Wasted Oil and Applying Timing on Carbonation and Chloride Resistances of High Volume SCM Concrete (폐유지류를 중심으로 한 도포제 종류 및 도포시기 변화가 혼화재 다량치환 콘크리트의 탄산화 및 염해저항성에 미치는 영향)

  • Han, Cheon-Goo;Choi, Young-Doo
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.3 no.3
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    • pp.228-236
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    • 2015
  • In this research, the influence of painting materials and applying timing on carbonation and chloride resistances of high volume SCMs concrete was evaluated. As a durability improving method, comparative tests were conducted with painting materials of ERCO (emulsified refined cooking oil), RCO (refined cooking oil), WR (water repellent agent), and ERCO + WR and with painting timings of right after demolding, and 28 days after the wet curing. From the experiment results, in the case of carbonation and chloride resistance, the carbonation depth and chloride penetration depth were decreased when the painting materials were applied in 28 days of wet curing. Additionally, for painting materials, with the order of ERCO, RCO, ERCO+WR, and WR, the carbonation and chloride penentration was delayed. Hence it is considered that ERCO shows the most favorable performance of resistance against carbonation and chloride penetration.

Extraction Characteristics of $Cr^{6+}$ from Aqueous Solutions with PC-88A, Alamine 336 and Aliquat 336 (PC-88A, Alamine 336 및 Aliquat 336에 의한 수용액중$Cr^{6+}$의 추출특성)

  • Kim Sung Gyu;Lee Hwa Young;Oh Jong Kee
    • Resources Recycling
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    • v.11 no.6
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    • pp.18-23
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    • 2002
  • A study on the solvent extraction of hexavalent chromium from aqueous solutions has been investigated. The results showed that the extraction efficiency of chromium increased in proportion to extractant concentration. Aliquat 336 of quarternary amine effectively extracted hexavalent chromium and was superior to Alamine 336. And the stabilizers like polyhydric alcohols of octanol, decanol and dodecanol showed the similar effect fur prevention of third phase and a little promotion of extraction efficiency in comparison with non-use of polyhydric alcohols. On the other hand, in solvent extraction of hexavalent chromium from aqueous solutions, the hexavalent chromium was completely extracted at pH range lower than 7 with 1% Aliquat 336 as extractant and 5% decanol as stabilizer and the hexavalent chromium in extractant was completely stripped with 1M sodium hydroxide solution in the stripping step.

Basic Properties of Concrete with Ultrafine-Blaine Air Cooling Slag as Admixture (초미분말 서냉 슬래그를 혼화재로 사용한 콘크리트의 기초적 특성)

  • Heo, Jae-Hyuk;Jeong, Sung-Wook;Her, Jae-Won;Lim, Nam-Gi
    • Journal of the Korea Institute of Building Construction
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    • v.9 no.2
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    • pp.77-83
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    • 2009
  • In this study, a test has been carried out to solve the problem with ground granulated blast-furnace slag, low early strength & lack of supply and to find out a way to use as concrete admixture of the ultrafine blaine air cooling slag which is all disposed as the by product of air cooling slag and its test was conducted to the replacement rate of ultrafine blaine air cooling slag & mixing condition of every concrete admixtures by type for the purpose of obtaining later a basic data for practical use of the cement that used ultrafine blaine air cooling slag by conducting comparative analysis. If ultrafine-blaine air cooling slag is used to the concrete following the results, a high efficiency water reducing agent won't be needed much for flow acquisition due to a high increase in flow, and the stripping time of concrete form will be shortened thanks to the acquisition of early strength, And though, it has the problems with long term strength which is similar or a little lower than the 3 types of ground granulated blast-furnace slag, it's still applicable as the substitute materials for 3 types of ground granulated blast-furnace slag at 10, 15% replacement rate of ultrafine-blaine air cooling slag, at which it shows higher activation index than 3 types of ground granulated blast-furnace slag.

Conducting Polymers with Functional Dopants and their Applications in Energy, Environmental Technology, and Nanotechnology

  • Kim, Sung Yeol;Song, Hyun-Kon
    • Clean Technology
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    • v.21 no.1
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    • pp.12-21
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    • 2015
  • Development of novel conducting polymers (CPs) is expected to facilitate the advancement of functional materials used for energy, environmental, and nanotechnology. Recent research efforts are focused on doping CPs with functional dopants to enhance their performance or add additional functions that are not inherent in CPs. This review surveys literatures about the doped CPs focusing on the roles of functional dopants, unlike other reviews focusing on the development of new conducting polymer backbones. The functional dopants presented in this review include redox active molecules, carbon nanomaterials, biopolymers, and chelating molecules. Depending on the dopants and their physicochemical properties, the doped CPs can be used for a variety of applications such as polymer batteries, membranes for waste water treatment, and chemical sensors. A major challenge of the CPs is presented and the ways to overcome the challenge is also suggested for the future development of stable, high performance CPs.

The Morphological Characteristics of Anaerobic Granular Sludge (혐기성 입상슬러지의 형태학적 특성)

  • Shin, Hang Sik;Bae, Byung Uk;Paik, Byung Cheon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.11 no.2
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    • pp.91-98
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    • 1991
  • In this paper, the microscopic results of granular sludge from the two-phase UASB reactors are presented, particularly on the acidogenic phase where the distillery waste water is directly delivered. Distillery wastewater as a feed contained SS of 3.6~10.6 g/l and COD of 17.3~30.4 g/l. A 12.5 l and a 4.7 l UASB reactors were used for acidogenic and methanogenic phases, repectively. Morphological studies on the granular sludge consortia were made with both scanning and transmission electron microscopies. It was interesting enough to find the different colored and shaped granules at the acidogenic on the 90th day and at the methanogenic phase on the 120th day. The acidogenic granular sludge mainly consisted of acidogenic bacteria, such as long chains of large rods, short plump rods, and various size of cocci. Whereas the filamentous bacteria of Methanothrix spp. prevail in the methanogenic granule, with dirverse bacteria entrapped therein.

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A Study on the Energy Reduction of a Heating Network Through the Application of an Absorption Heat Pump (열원조건 분석 통한 흡수식 히트펌프 적용 열에너지 네트워크의 에너지 절감 예측)

  • Na, Sun-Ik;Lee, Young-Soo;Baik, Young-Jin;Lee, Gilbong
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.5
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    • pp.239-248
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    • 2017
  • At the $21^{st}$ Conference of the Parties (COP) of the United Nations Climate change Conference, representatives of the 195 member countries reached an agreement requiring all participating countries, including Korea, to establish proactive measures to fight climate change. Under this vision, energy network technologies are deemed as a key site of research towards meeting this goal. Herein, the headquarters of the Korea Institute of Energy Research (KIER) is a worthy site for carrying out energy network technology research insofar as it contains various heat sources. To prepare for this research, a study was conducted analyzing the heat sources at KIER based on measured data. The study also consisted of developeding simulation models to predict the amount of energy savings that could be derived by replacing an absorption chiller/heater with an absorption heat pump during winter seasons. In our simulation results, we observed a primary energy saving ratio of 65~72% based on the water temperature from the heat source of a coal power plant.

APEX(Agricultural Policy/Environmental eXtender) Model: An Emerging Tool for Agricultural Environmental Analyses

  • Kim, Min Kyeong;Choi, Soon Kun;Jung, Goo Buk;Kim, Myung Hyun;Hong, Seong Chang;So, Kyu Ho;Jeong, Jae Hak
    • Korean Journal of Soil Science and Fertilizer
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    • v.47 no.3
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    • pp.187-190
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    • 2014
  • The agricultural policy/Environmental eXtender (APEX) model was developed by the Blackland Research and Extension Center in Temple, Texas. APEX is a flexible and dynamic tool that is capable of simulating a wide array of management practices, cropping systems, and other land uses across a broad range of agricultural landscapes, including whole farms and small watersheds. The model can be configured for novel land management strategies, such as filter strip impacts on pollutant losses from upslope crop fields, vegetated grassed waterways in combination with filter strip impacts, and land application of manure removed from livestock feedlots or waste storage ponds. The APEX model has continually evolved since its inception, and the process of adaptation and modification will likely continue as use of the model expands for an ever-increasing range of environmental problems and conditions. Several improvements to specific model subroutines have already been initiated, while other potential improvements have been identified that will require future research and code modification efforts.