• Title/Summary/Keyword: Environmental enrichment

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Biological Dechlorination of Chlorinated Ethylenes by Using Bioelectrochemical System (생물전기화학시스템을 이용한 염화에틸렌의 생물학적 탈염소화)

  • Yu, Jaecheul;Park, Younghyun;Seon, Jiyun;Hong, Seongsuk;Cho, Sunja;Lee, Taeho
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.5
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    • pp.304-311
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    • 2012
  • Chlorinated ethylenes such as perchloroethylene (PCE) and trichloroethylene (TCE) are widely used as industrial solvents and degreasing agents. Because of improper handling, these highly toxic chlorinated ethylenes have been often detected from contaminated soils and groundwater. Biological PCE dechlorination activities were tested in bacterial cultures inoculated with 10 different environmental samples from sediments, sludges, soils, and groundwater. Of these, the sediment using culture (SE 2) was selected and used for establishing an efficient PCE dechlorinating enrichment culture since it showed the highest activity of dechlorination. The cathode chamber of bioelectrochemical system (BES) was inoculated with the enrichment culture and the system with a cathode polarized at -500 mV (Vs Ag/AgCl) was operated under fed-batch mode. PCE was dechlorinated to ethylene via TCE, cis-dichloroethylene, and vinyl chloride. Microbial community analysis with polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) showed that the microbial community in the enrichment culture was significantly changed during the bio-electrochemical PCE dechlorination in the BES. The communities of suspended-growth bacteria and attached-growth bacteria on the cathode surface are also quite different from each other, indicating that there were some differences in their mechanisms receiving electrons from electrode for PCE dechlorination. Further detailed research to investigate electron transfer mechanism would make the bioelctrochemical dechlorination technique greatly useful for bioremediation of soil and groundwater contaminated with chlorinated ethylenes.

Geochemical Study of Coastal Sediments around the Samcheonpo Coal-fired Power Plant (삼천포화력발전소 주변해역 퇴적물의 지구화학적 연구)

  • Lee, Doo-Ho;Lim, Ju-Hwan;Jeong, Yeon-Tae;Jeong, Nyeon-Ho;Kang, Jeong-Won
    • Journal of Environmental Impact Assessment
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    • v.10 no.2
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    • pp.85-98
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    • 2001
  • This study was conducted to investigate the geochemical factors governing the distribution of heavy metals(Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in the marine surface sediment samples collected from the Samcheonpo coal-fired power plant. Variations of absolute metal concentrations were related to those in textural and/or carbonate and organic matter content. Most elements, except for Pb, showed generally lower contents compared with the average shale concentration, and the effect of anthropogenic input appeared to be minimal in the sediments. Computations of LF%(labile fraction) and EF(enrichment factor) based on all trace metal data indicated the presence of mineralogical control for Co, Cr, Cu, Ni, and Zn, and anthropogenic contamination for Pb, which needs to be considered in the design of long term monitoring programmes.

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Characteristics of Heavy Metallic Elements of PM10 for Yellow sand and Non-Yellow sand during Springtime of 2002 at Busan (2002년 부산지역 봄철 황사/비황사시 PM10 중의 중금속 농도 특성)

  • Jeon, Byung-Il
    • Journal of Environmental Impact Assessment
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    • v.12 no.2
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    • pp.99-108
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    • 2003
  • We collected and analyzed PM10 samples to account for the characteristics of heavy metallic elements for yellow sand and non-yellow sand during springtime of 2002 at Busan, The mean PM10 mass concentration for springtime of 2002 was $219.82{\mu}g/m^3$ with the maximum $787.50{\mu}g/m^3$ and the minimum $19.44{\mu}g/m^3$. The mean concentration of metallic elements contained in PM10 are shown as follows : Si>Ca>Fe>Al>Na, respectively. The ratio of mean PM10 mass concentration for yellow sand($362.7{\mu}g/m^3$) to that for non-yellow sand($48.3{\mu}g/m^3$) was 7.5, the significant positive correlation (P<0.05) was found between yellow sand and non-yellow sand. The metallic elements concentration ratios of yellow sand to the non-yellow sand were over 10 times for Al, Ca, Mg, 4~8 times for Fe, Si, Mn. But the concentration of Na, Cu, Zn for non-yellow sand was higher than those of yellow sand. The crustal enrichment factor of Cd, Cu, Pb, Zn, Cr, K, Mn, Na, Ni for yellow sand was higher that of non-yellow sand over 10 times, and concentration rate of soil particles of yellow sand was increased 2.3 times that of nonyellow sand.

Characterization of Sea Salt in PM10 at Inland and Seashore in Busan, Korea

  • Jeon, Byung-Il
    • Journal of Environmental Science International
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    • v.19 no.7
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    • pp.799-806
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    • 2010
  • In an effort to characterize temporal and spatial variability of $PM_{10}$ and to quantitatively estimate contribution of sea salt aerosol to $PM_{10}$ mass in Busan area, twenty four-hour averaged concentration of $PM_{10}$ were measured in two distinct areas, Gwaebeopdong(inland) and Dongsamdong(seashore), Busan for summer and fall, 2007. It was found that sea salt accounted for 2.9% and 9.5% of $PM_{10}$ mass in Gwaebeopdong and Dongsamdong, respectively for the study period, indicating that contribution of sea salt to $PM_{10}$ mass and total ion concentration in seashore area were consistently higher by a factor of three compared to inland area. Temporal analysis suggested that sea salt contributions to $PM_{10}$ in Dongsamdong were higher in summer due to the southerly sea breeze while there was no significant fluctuation of sea salt contribution for the summer and fall months in Gwaebeopdong. Sea salt enrichment factors($EF_{sea}$) of $K^+$ $Ca^{2+}$ and ${SO_4}^{2-}$ (>10) indicated major contributions from anthropogenic sources and EFs of $Mg^{2+}$ and $Cl^-$ exhibited strong association with oceanic origins for both areas.

Heavy metal assessment of marine sediment in selected coastal districts of the Western Region, Ghana

  • Kuranchie-Mensah, Harriet;Osei, Juliet;Atiemo, Sampson M.;Nyarko, Benjamin J.B.;Osae, Shiloh K.;Laar, Cynthia;Ackah, Michael;Buah-Kwofie, Archibold;Blankson-Arthur, Sara;Adeti, Prince J.
    • Advances in environmental research
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    • v.2 no.2
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    • pp.155-166
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    • 2013
  • A preliminary investigation to establish the status of contamination of trace metals in the Western coast of Ghana was conducted prior to the commercial production of crude oil in the area. The study revealed the presence of heavy metals such as Pb (4.00-79.64 mg/kg), As (8.81-236 mg/kg), Cu (12.86-108.06 mg/kg), V (28.07-953.32 mg/kg), Zn (7.08-264.25 mg/kg), Cr (101.69-1366.62 mg/kg), Ni (42.41-451.43 mg/kg), Mn (16.77-1890.45mg/kg), Br (7.66-142.78 mg/kg), Ti (542.03-19960 mg/kg) and Fe (7472.88-97120 mg/kg) at six sites sampled along the coast. With the exception of Ti and Fe which showed no variation in metal concentration, the rest of the metals varied significantly among the sampled locations. Potential ecological risk of metals particularly of Co, As and Br which exhibited extreme enrichment of the sediments indicates considerable metal pollution in the studied areas. The degree of contamination is of particular concern especially to benthic biota that inhabit this environment for survival.

Environmental toxicity and biodegradation of Pseudomonas sp. EL-G527 producing biosurfactant

  • Mi Seon, Cha;Hong Ju, Son;Sang Jun, Lee
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2002.05b
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    • pp.452-454
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    • 2002
  • A biosurfactant-producing microorganism, .Pseudomouos sp. EL-G527 was isolated from activated sludge by enrichment culture when grown on mineral salt medium containing n-hexadecane as a carbon source. The biosurfactant from .Pseudomonar sp. EL-G527 exhibited lesser toxicity to bacterial population than synthetic surfactants and in the biodegradation test, biosurfactant was rapidly degraded and lost its activity as surface active material after 1 day incubation. In this study, the biosurfactant from Pseudomonas sp. EL-G527 was effective surface-active compound, more biodegradable and less toxic to microbial ecosystem than various synthetic surfactants.

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Analysis of Microbial Community During the Anaerobic Dechlorination of Tetrachloroethylene (PCE) in Stream of Gimpo and Inchon Areas (경기도 김포, 인천 서구지역 소하천의 PCE 탈염소화 군집의 선별 및 다양성 분석)

  • Kim, Byung-Hyuk;Baek, Kyung-Hwa;Cho, Dea-Hyun;Sung, Youl-Boong;Ahn, Chi-Yong;Oh, Hee-Mock;Koh, Sung-Cheol;Kim, Hee-Sik
    • Korean Journal of Microbiology
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    • v.45 no.2
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    • pp.140-147
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    • 2009
  • In this study, anaerobic enrichment cultivation was performed with the sediments from the Gimpo and Inchon areas. Lactate as an electron donor and PCE as an electron acceptor was injected into the serum bottle with an anaerobic medium. After the incubation of 8 weeks, the reductive dechlorination of PCE was observed in 7 sites among 16 sites (43%). Three enrichment cultures showed completely dechlorination of PCE to ethene, while four enrichment culture showed transformation of PCE to cis-DCE. The bacterial community structure was analyzed by PCR-DGGE. Dechlorinating bacteria were detected by species-specific primers. The dominant species in seven anaerobic enrichments were found to belong to the genus of Dehalococcoides sp. and Geobacter sp., and Dehalobacter sp.

Analysis of Relationship between Tomato Growth, Vital Response, and Plant-induced Electrical Signal in a Plastic Greenhouse due to Carbon Dioxide Enrichment Treatment (플라스틱 온실 내 이산화탄소 시비에 따른 토마토 생육과 생체 반응 및 Plant-induced Electrical Signal 간 관계 분석)

  • Hee Woong Goo;Gyu Won Lee;Wook Jin Song;Do Hyeon Kim;Hyun Jun Park;Kyoung Sub Park
    • Journal of Bio-Environment Control
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    • v.32 no.4
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    • pp.484-491
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    • 2023
  • Tomatoes in greenhouse are a widely cultivated horticultural crop worldwide, accounting for high production and production value. When greenhouse ventilation is minimized during low temperature periods, CO2 enrichment is often used to increase tomato photosynthetic rate and yield. Plant-induced electrical signal (PIES) can be used as a technology to monitor changes in the biological response of crops due to environmental changes by using the principle of measuring the resistance value, or impedance, within the crop. This study was conducted to investigate the relationship between tomato growth data, vital response, and PIES resulting from CO2 enrichment in greenhouse tomatoes. The growth of tomato treated with CO2 enrichment in the morning was significantly better in all items except stem diameter compared to the control, and PIES values were also higher. The growth of tomato continuously applied with CO2 was better in the treatment groups than control, and there was no significant difference in chlorophyll fluorescence and photosynthesis. However, PIES and SPAD values were higher in the CO2 treatment group than control. CO2 enrichment have a direct relationship with PIES, growth increased, and transpiration increased due to the increased leaf area, resulting in increased water absorption, which appears to be reflected in PIES, which measures vascular impedance. Through this, this study suggests that PIES can be used to monitor crops due to environmental changes, and that PIES is a useful method for non-destructively and continuously monitoring changes of crops.

PRELIMINARY STUDY ON THE ALPHA TRACK ANALYSIS OF SPHERICAL URANIUM METAL PARTICLES

  • Pyo Hyung-Yeol;Kim Jong-Yun;Lee Myung-Ho;Park Yong-Jun;Jee Kwang-Yong;Kim Won-Ho
    • Nuclear Engineering and Technology
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    • v.38 no.4
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    • pp.353-358
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    • 2006
  • Alpha track analysis for the determination of the trace amount of alpha emitting nuclides in a very small particle was performed as an efficient and powerful technique during safeguard inspection. Metal particles with well-defined spherical shape, size and isotopic compositions as a reference material were used to correlate the number of tracks or track diameter with an isotopic composition eventually to identify the uranium enrichment in the environmental swipe samples. Slopes in the number of tracks versus the exposure time curve provide a simple insight into the uranium enrichment of an unknown particle. Low enriched uranium metal particles result in slopes still steeper than the depleted or natural uranium metal particles. In addition, a linear relationship between track diameter and particle size Is thought to be a useful first stage analytical tool as an efficient and convenient inspection guide. The significance of the simple linear model was also judged using the usual statistical tests.

Successful Enrichment of Rarely Found Candidatus Anammoxoglobus propionicus from Leachate Sludge

  • Hsu, Shu-Chuan;Lai, Yen-Chun;Hsieh, Ping-Heng;Cheng, Pun-Jen;Wong, Suen-Shin;Hung, Chun-Hsiung
    • Journal of Microbiology and Biotechnology
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    • v.24 no.7
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    • pp.879-887
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    • 2014
  • Bacteria that mediate the anaerobic oxidation of ammonium (anammox) have been detected in natural ecosystems, as well as various wastewater treatment systems. In this study, sludge from a particular landfill leachate anaerobic treatment system was selected as the incubation seed for anammox microorganism enrichment owing to its possible anammox activity. Transmission electron microscopy observation, denaturing gradient gel electrophoresis analysis, and cloning/sequencing techniques were applied to identify the diversity of anammox microorganisms throughout the incubation. During the early stage of operation, the diversity of anammox microorganisms was similar to the original complex microbes in the seed sludge. However, as incubation time increased, the anammox microorganism diversity within the system that was originally dominated by Candidatus (Ca.) Brocadia sp. was replaced by Ca. Anammoxoglobus propionicus. The domination of Ca. Anammoxoglobus propionicus produced a stable removal of ammonia (70 mg-N/l) and nitrite (90 mg-N/l), and the total nitrogen removal efficiency was maintained at nearly 95%. The fluorescence in situ hybridization results showed that Ca. Anammoxoglobus propionicus was successfully enriched from $1.8{\pm}0.6%$ initially to $65{\pm}5%$ after 481 days of operation. Therefore, the present results demonstrated the feasibility of enriching Ca. Anammoxoglobus propionicus from leachate sludge, even though the original cell count was extremely low. Application of this seldom found anammox organism could offer an alternative to current ammonia-nitrogen treatment.