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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Environmental Engineers
Journal Basic Information
Journal DOI :
Korean Society of Environmental Engineering
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Volume & Issues
Volume 32, Issue 12 - Dec 2010
Volume 32, Issue 11 - Nov 2010
Volume 32, Issue 10 - Oct 2010
Volume 32, Issue 9 - Sep 2010
Volume 32, Issue 8 - Aug 2010
Volume 32, Issue 7 - Jul 2010
Volume 32, Issue 6 - Jun 2010
Volume 32, Issue 5 - May 2010
Volume 32, Issue 4 - Apr 2010
Volume 32, Issue 3 - Mar 2010
Volume 32, Issue 2 - Feb 2010
Volume 32, Issue 1 - Jan 2010
Selecting the target year
Findings of Microbial Community Structure and Dominant Species in Soils Near Army Bases and Gas Stations
Kim, Jai-Soo ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 227~233
This study examined microbial community structures (MCSs) according to environmental factors through DGGE analysis and comparison in various soils collected from near army bases and gas stations. As a result, the similarities based on DGGE band profiles showed the closer relationship in regional properties than in pollution characteristics, probably due to the degree of weak contamination. The highly contaminated samples with oil revealed low MCS similarities with others in the same region and very low with all the other samples in the other regions. Thus the microbial community structure would more be affected by region-based natural factors than by contamination factors in case of minor pollution. All the dominant culturable bacterial species were involved in firmicutes or high GC Gram+ in a major portion of soil samples and the highly oil-contaminated samples contained Arthrobacter, Bacillus, Methylobacterium, Clavibacter, Streptomyces and Nocardia as reported genera, and Leifsonia as a unreported genus.
Effectiveness of Zeolite and Granular Activated Carbon Addition before Starvation for the Performance Recovering of the Sludge Settleability and Removal Efficiency
Oh, Hye-Ran ; Kim, Sang-Soo ; Moon, Byung-Hyun ; Yoon, Cho-Hee ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 234~240
The effectiveness of adding powdered zeolite and granular activated carbon (GAC) before starvation into biological reactor for recovering its performances was investigated. Two types of carrier addition in Sequencing Batch Reactor (SBR) system for non-saline and saline wastewater were evaluated after starvation periods. During the experiment, settleablity (SVI), floc size, fractal dimension,
, T-N, T-P removal efficiencies and recovery time were monitored. When the wastewater feeding was resumed after starvation period for 5days, the SVI increased at the beginning of resumption and then decreased with time in both types. And the larger the floc size and fractal dimension of floc, the more increased removal efficiency for
, T-N and T-P was also. Its performance recovery was strongly correlated with floc size and fractal dimension of activated sludge. After resuming the wastewater feeding, the SVI, floc size, fractal dimension,
, T-N, T-P removal efficiency of SBR with carrier improved and reached its initial value faster compared to those of SBR without carrier.
Effects of Operating Parameters on Dissolved Ozone and Phenol Degradation in Ozone Contact Reactor
Chung, Jae-Woo ; Park, Jeong-Wook ; Lee, Chun-Sik ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 241~247
The Effects of operating parameters such as initial pH, gaseous ozone concentration, supplied gas flow rate on dissolved ozone concentration and phenol degradation in ozone contact reactor were investigated. Dissolved ozone concentrations were saturated to constant values after a certain ozone contact time. The saturation values were influenced by experimental parameters. Dissolved ozone concentration decreased with the increase of initial pH because the ozone is unstable in high pH regions. The gaseous ozone concentration in a constant gas supply affected the saturation concentration of dissolved ozone and the injection rate of gas with a constant ozone concentration determined the rate to reach dissolved ozone saturation. Effects of operating parameters on phenol degradation were closely related with those of parameters on dissolved ozone concentration. Phenol degradation was enhanced by the increase of initial pH, because the degradation of dissolved ozone gave birth to free radicals which have much higher reactivity with phenol. Increase of gaseous ozone concentration and gas flow rate promoted the phenol degradation through the generation of dissolved ozone which plays the role in phenol degradation. The injection of methanol deteriorated the phenol degradation through the scavenging effect on OH radicals.
Feasibility Study for Removal of Red Tide by Batch Fed Electron Beam Irradiation
Kang, Ho ; Lim, Seon-Ae ; Jeong, Ji-Hyun ; Kim, Yu-Ri ; Han, Beom-Su ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 248~255
This study was carried out to assess the feasibility of the electron beam irradiation as a mean of red tide control in coastal water. Prorocentrum minimum, Prorocentrum micans, Cochlodinium polykrikoides, Heterosigma akashiwo, Alexnadrium catenella were selected and cultured for experiments, and red tide occurring in Tongyeong(2007. 8. 15) was also tested under the same conditions. The irradiation dose were 1 kGy, 2 kGy, 4 kGy and 8 kGy. The result showed 50~65% extinction in red tide cells was observed right after irradiation dose of 1 kGy and 86~97% within 1 day after irradiation, compared with control. Chlorophyll-a concentration of red tide was reduced by 50~64% immediately and it was drastically reduced up to 86~97% 1 day after irradiation. When the culture was irradiated at 1 kGy, 28~47% of s-protein was released immediately, and 77~138% was released 1day after irradiation. 77~212% of s-carbohydrate was excreted after 1 day while 16~45% of s-carbohydrate was excreted immediately. A transmission electron microscope(TEM) observation for the irradiated red tide revealed that the cell was destroyed and intracellular biopolymeric substance was leached out from the damaged cell as a result of electron beam irradiation. These results imply that electron beam irradiation is enable to control red tide by flocculation with extracellular biopolymer. The paralytic shellfish poisoning(PSP) toxin contents produced by Alexandrium catenella was decreased 48% by 1 kGy of electron beam irradiation compared with the unirradiated cells. As a result, electron beam irradiation was effective for detoxication as well as destruction of red tide.
Effect of Salt Concentration on the Aerobic Biodegradability of Sea Food Wastewater
Choi, Yong-Bum ; Kwon, Jae-Hyouk ; Rim, Jay-Myung ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 256~263
The study was performed to evaluate the effects of chloride concentrations on the ultimate aerobic biodegradability and to use the result as the fundamental data for sea food wastewater treatment. When the organic removal efficiency by chloride concentrations (1,400~18,000 mg/L) was evaluated, microbes adapted to the saline at
6,000 mg/L of chloride but treatment efficiency was not improved at
12,000 mg/L of chloride because of delayed reaction time. Functional coefficient
of non-biodegradable soluble organic and inert material production coefficient Yp by microbe metabolism increased as chloride concentrations increased. Soluble organic matter ratio by chloride concentration (0~18,000 mg/L) was 10.8~13.1%, inert material production efficiency by microbes metabolism was evaluated as 7.0~24.6%.
-N removal efficiencies were 96.2, 96.5, 90.2 and 90.3% using original wastewater HRT 18 hr, 6,000 mg/L chloride concentration HRT 22 hr, 12,000 mg/L chloride concentration HRT 30 hr, and 18,000 mg/L chloride concentration HRT 45 hr, respectively. Nitrification process was more sensitive to salt concentration than organic matter removal to salt concentration. Under
6,000 mg/L chloride concentration, conversion rate from
-N was low.
Pre-Treatment of Sewage Sludge by Hydrodynamic Cavitation-II: Enhancement of Digestion Efficiency
Maeng, Jang-Woo ; Lee, Eun-Young ; Bae, Jae-Ho ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 264~270
Waste activated sludge from sewage treatment plants mainly consisted of flocs of bacterial cell, and thus hard to be stabilized anaerobically due to rigid cell walls. One of the pretreatment methods to overcome this barrier is the venturi cavitation system (VCS) adopting hydrodynamic cavitation. This research was conducted to investigate the effects of the pretreatment of waste activated sludge by VCS on the anaerobic digestibility. Depending on the pretreatment period with the VCS, methane production, COD removal and VS removal efficiency increased 41%~45%, 36.5%~43.1% and 18.4~24.1%, respectively, compared to the control case. The increase in methane production from digester was 3.3~4.2 times higher than the theoretical methane potential of the increased SCOD after the VCS pre-treatment. This suggests that the VCS pre-treatment not only increases SCOD but also improves the digestibility of solid fractions. The energy mass balance indicated that the energy consumed for sludge pre-treatment could be recovered by the increased methane production after pre-treatment, suggesting the high potential for field application.
Seasonal Variation of Picoplankton Community in Lake Juam
Cheong, Cheong-Jo ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 271~277
The purpose of this study is to investigate the seasonal variation of picoplankton community in Lake Juam depending on the change of physico-chemical factors such as rainfall, water depth, DO and pH. The concentration of chlorophyll-a was most high as 18.03 mg/
in July when the rainfall and water temperature were highest. The concentration was gradually decreased in October, April and that of January was decreased most low as 1.86 mg/
. The highest concentration of the Chl-a was shown at 2 and 5 m of water depth than surface, and the concentration was gradually decreased when the water depth becomes deep. Overall, microplankton was the highest rate as 33.9~54.2%, nanoplankton was 24.3~30.5% and picoplankton was 21.6~41.2%. Picoplankton was included as considerable concentration in the water of Juam lake. Therefore it is necessary to remove thoroughly the picoplankton in the water treatment processes such coagulation·sedimentation and sand filtration. The protoplasm released from destruction of picoplankton by chlorine has high possibility to cause regrowth of bacteria and pathogenic microorganism in the distribution system by playing the role of the assimilable organic carbon.
Environmental Monitoring of Selected Veterinary Antibiotics in Soils, Sediments and Water Adjacent to a Poultry Manure Composting Facility in Gangwon Province, Korea
Lee, Hyeon-Yong ; Lim, Jung-Eun ; Kim, Sung-Chul ; Kim, Kwon-Rae ; Lee, Sang-Soo ; Kwon, Oh-Kyung ; Yang, Jae-E ; Ok, Yong-Sik ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 278~286
Veterinary antibiotics have been used to treat disease and to promote growth of livestock. However, the total amount of veterinary antibiotics in Korea was much greater than other developed countries, and there is a high potential to release residual of antibiotics to environment. Consequentially, released antibiotics into the environment produces antibiotic resistant bacteria and causes adverse effects on human health. The objective of this research was to monitor antibiotic concentration in the environment adjacent to facilities which compose chicken manure. Total of 10 antibiotics were selected based on the total amount of higher usage in Korea, and its residuals were measured from surface water, soil and sediment. The frequencies of detected antibiotics were ranged 31-92% from soil, 0-93% from water, and 33-93% from sediment. Generally, a higher frequency was observed in soil or sediment than water. Different ranges in concentration among 4 different antibiotic groups was found from not detected(N.D.) to 35.6
for soil, N.D. to 19.2
for water and N.D. to 114.3
for sediment. Our findings suggest that solid phase such as soil and sediment is a critical component to be needed to conduct the environmental impact assessment of antibiotics.
Characteristics of Trace Element Concentrations in Dust by Facilities and Areas in Daegu, Korea
Song, Hee-Bong ; Do, Hwa-Seok ; Kwak, Jin-Hee ; Kim, Jong-Woo ; Kang, Jae-Hyoung ; Phee, Young-Gyu ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 287~295
Dust samples have been collected from streets, schools, subway stations and households in Daegu metropolitan city. Samples were sieved through a 100
mesh and the concentration of 14 elements have been determined using by ICP after acid extraction. Results showed that Ca, Fe, K, Mg, Mn, Na and V were influenced by natural sources while Cd, Cr, Cu, Ni, Pb and Zn were influenced by anthropogenic sources. The measured values were remarkably higher in components from natural sources than in components from anthropogenic sources. In particular, school dust had higher levels of Ca and Pb and subway station dust had higher levels of Cu and Zn. The percentage composition of chemicals from subway stations, households, and schools were remarkably higher in components from anthropogenic sources than that from streets. It is well recognized that anthropogenic sources were affected by indoor dust. Results of pollution index of hazardous heavy metals indicated that schools, households, and subway stations were more contaminated than streets and urban areas typically had higher pollution index than rural areas. The correlation analysis among trace elements seem to suggest that there were correlations between components of soil/road dust resuspension, and components of waste incineration and fuel combustion.
) Process in Drinking Water Treatment
Son, Hee-Jong ; Yoom, Hoon-Sik ; Bin, Jae-Hoon ;
Journal of Korean Society of Environmental Engineers, volume 32, issue 3, 2010, Pages 296~308
The peroxone process overcomes many of the limitations associated with conventional and advanced water treatment systems using chlorine disinfection and ozone oxidation processes. Ozone and hydrogen peroxide generate highly reactive hydroxyl free radical which oxidize various organic compounds and has highly removal efficiency. The key issue to operate peroxone process is developing the method to achieve high process effectiveness when scavengers that inhibit generation of OH radicals or consume OH radicals are co-existing in the process. Also many studies, to minimize inorganic oxidative by-products such as bromate and to reduce disinfection by-products after chlorination behind peroxone process, are needed. And we should consider the excess residual hydrogen peroxide in the water. On-line instruments and control strategies need to be developed to ensure effective and robust operation under conditions of varying load. If problems above mentioned are solved, peroxone process will be applied diversely for water treatment.