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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Environmental Health Sciences
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Journal DOI :
Korean Society of Environmental Health
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Volume & Issues
Volume 34, Issue 6 - Dec 2008
Volume 34, Issue 5 - Oct 2008
Volume 34, Issue 4 - Aug 2008
Volume 34, Issue 3 - Jun 2008
Volume 34, Issue 2 - Apr 2008
Volume 34, Issue 1 - Feb 2008
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Effect of Methyl tert-butyl Ether and Its Metabolites on the Microbial Population: Comparison of Soil Samples from Rice Field, Leek Patch and Tidal Mud Flat
Cho, Won-Sil ; Cho, Kyung-Suk ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 403~413
DOI : 10.5668/JEHS.2008.34.6.403
Toxic effect of methyl tert-butyl ether (MTBE), tert-butyl alcohol (TBA) and formaldehyde (FA) on microbial activity and diversity was compared in rice field, leek patch, and tidal mud flat soil samples. MTBE, TBA and FA with different concentrations were added into microcosms containing these soil samples, and placed at room temperature for 30 days. Then the microbial activities such as dehydrogenase and viable cell numbers and microbial community using a DGGE (Denaturing gradient gel electrophoresis) fingerprinting method were measured. Among the samples, dehydrogenase activity in rice field was inhibited the most by MTBE, TBA and FA. The toxic effect was higher according to the following orders: FA > MTBE > TBA. Dominant species in the microcosms contaminated with MTBE, TBA and FA were Chloroflex, Bacilli, gamma-proteobacteria in the rice field sample, Sphingobacteria, Flavobacteria, Actinobacteria, Bacilli, gamma-proteobacteria in the leek patch sample, and Sphingobacteria, Flavobacteria, delta-proteobacteria, gamma-proteobacteria in the tidal mud flat sample.
Estimation of Methane Generation Rate and Potential Methane Generation Capacity at Cheongju Megalo Landfill Site Based on LandGEM Model
Hong, Sang-Pyo ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 414~422
DOI : 10.5668/JEHS.2008.34.6.414
Methane is a potent greenhouse gas and methane emissions from landfill sites have been linked to global warming. In this study, LandGEM (Landfill Gas Emission Model) was applied to predict landfill gas quantity over time, and then this result was compared with the data surveyed on the site, Cheongju Megalo Landfill. LandGEM allows the input of site-specific values for methane generation rate (k) and potential methane generation capacity
, but in this study, k value of 0.04/yr and
/ton were considered to be most appropriate for reflecting non-arid temperate region conventional landfilling like Cheongju Megalo Landfill. Relatively high discrepancies between the surveyed data and the predicted data about landfill gas seems to be derived from insufficient compaction of daily soil-cover, inefficient recovery of landfill gas and banning of direct landfilling of food waste in 2005. This study can be used for dissemination of information and increasing awareness about the benefits of recovering and utilizing LFG (landfill gas) and mitigating greenhouse gas emissions.
NADH Variation and Process Control with NADH Fluorometer in Full Scale Biological Nutrient Removal Process
Kim, Han-Lae ; Cho, Jong-Bok ; Cho, Il-Hyoung ; Lee, Jin-Woo ; Chang, Soon-Woong ; Lee, Si-Jin ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 423~432
DOI : 10.5668/JEHS.2008.34.6.423
In this study, we investigated the possibility of auto control and the proper operating factors in the BNR(Biological Nutrient Removal) process using an NADH(Reduced Nicotinamide Adenine Dinucleotide) fluorometer, which characterized the emitted fluorescence when activated by flashes of UV light at 460 nm. In terms of finding adequate operating parameters, results indicted that nitrification efficiency decreased in the controlled DO while denitrification efficiency decreased in the controlled pH. The above results indicated that controlled operating condition after combination with NADH, DO and pH was resonable. Result obtained from the correlation between NADH and pH showed that variation trend of influent loading was similar to those of NADH and pH, and also the variation cycle was repeated on a daily basis. Consequently, this result showed the increase of BOD loading caused the nitrification efficiency to decrease because air-flow, required for nitrification, was reduced, and so the NADH value was increased. From these results, it is possible to use NADH flourimetry to assess the variation of organic load and nitrification efficiency in the case of small change in influent pH such as in sewage and also to handle and operate the load variation in the auto control system using the NADH fluorometer.
Immunoassay for Monitoring Pesticide Contamination in Agricultural Products
Park, Eun-Kee ; Lee, Hu-Jang ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 433~438
DOI : 10.5668/JEHS.2008.34.6.433
Much of the increase in agricultural productivity over the past half century has been due to the control of the pests with synthetic pesticides. The use of these pesticides has caused environmental problems and public health concern. The guidelines of maximum residue levels of pesticides in agricultural products has been well documented but more careful monitoring of their residues is required. Pyrethorid class pesticides are dominant in modern agricultural industry but public health concerns have been recently considered. The major route of pesticide exposure is the diet and with improved surveillance of pyrethorid residues in agricultural products their exposure should be controlled and minimized. In suitable products with reduced matrix effects such as agricultural products, aqueous samples, fruits and vegetables the use of immunoassays for pyrethorid residue monitoring could satisfy this requirement. Immunoassays have several advantages, namely they are highly sensitive, selective and cost-effective and enable large-scale sample handling and analysis in the laboratory.
Removal of Rhodamine B in Water by Ultraviolet Radiation Combined with Electrolysis(I)
Park, Young-Seek ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 439~445
DOI : 10.5668/JEHS.2008.34.6.439
The feasibility study for the application of the removal and mineralization of Rhodamine B (RhB) was performed in a batch electrochemical reactor. The electro/UV process was consisted of DSA (dimensionally stable anode) electrode and UV-C or ozone lamp. The experimental results showed that RhB removal by the ozone lamp was higher than that of the UV-C lamp. Optimum current of the electro/UV process was 1 A. The electrochemical, UV and electro/UV process could completely degrade RhB, while a prolonged treatment was necessary to reach a high level RhB mineralization. It was observed that RhB removal in electro/UV process is similar to the sum of the UV and electrolytic decolorization. However, it was found that the COD of RhB could be degraded more efficiently by the electro/UV process (90.2 %) than the sum of the two individual oxidation processes [UV (19.7%) and electrolytic process (50.8%)]. A synergetic effect was demonstrated between the UV and electrolysis.
Sewage Treatment Using a Modified DNR Process
Choi, Jin-Taek ; Nam, Se-Yong ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 446~451
DOI : 10.5668/JEHS.2008.34.6.446
In this study, the removal characteristics of organic components and nutrients of sewage taken from the Suwon area were investigated in a lab-scale modified DNR (Daewoo Nutrient Removal) process. The modified DNR process consisted of a sludge denitrification tank, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary anoxic tank and a secondary aerobic tank. The proposed process with the average C/N ratio of 3.5 was performed for the sewage treatment. The results were compared with other existing DNR processes. The organic fractions in sewage were analyzed by measuring the oxygen uptake rate. The resulting removal efficiencies of SS, BOD, COD, TN and TP were 93.1%, 95.5%, 86.1%, 67.8% and 80.6%, respectively.
Anaerobic/Aerobic Biological Reaction Characteristics of the Marine Products Industry Wastewater
Choi, Yong-Bum ; Kim, Gau-You ; Kwon, Jae-Hyouk ;
Korean Journal of Environmental Health Sciences, volume 34, issue 6, 2008, Pages 452~458
DOI : 10.5668/JEHS.2008.34.6.452
This study was undertaken to establish the biological reaction characteristics of the marine products industry wastewater which contains high concentrations of organic matter and saline. As the S/I is varied from 0.3 to 1.2, the results were follows : the observed ultimate anaerobic biodegradability varied from 72.0 to 88.0%, the first order reaction rate varied from 0.1735 to
and the second order reaction rate varied from 0.0132 to
. When S/I was 0.9, the first order reaction rate had a maximum value, but the variations of the second order reaction rate were less than 1st-order reaction rate. When the operation time exceeded 2 days the gas production rapidly increased. The source of this rapid increase was due to that the activity of the granular sludge used in this study being faster than that of conventional sludge. Under aerobic condition, the characteristics of organic matter were as follows: the marine industry wastewater used in this study contained about 81% of biodegradable matter, and it was divided into readily biodegradable COD(Ss), slowly biodegradable COD(Xs), soluble COD(Si) and inert suspended COD (Xi). The percentages of each COD were 87.3%, 23.9%, 6.4% and 12.4% respectively.