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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 30, Issue 12 - Dec 2008
Volume 30, Issue 11 - Nov 2008
Volume 30, Issue 10 - Oct 2008
Volume 30, Issue 9 - Sep 2008
Volume 30, Issue 8 - Aug 2008
Volume 30, Issue 7 - Jul 2008
Volume 30, Issue 6 - Jun 2008
Volume 30, Issue 5 - May 2008
Volume 30, Issue 4 - Apr 2008
Volume 30, Issue 3 - Mar 2008
Volume 30, Issue 2 - Feb 2008
Volume 30, Issue 1 - Jan 2008
Selecting the target year
Effect of Monochloramine and Dimethylamine Concentrations on the NDMA Formation
Kim, Jong-O ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 755~759
As a disinfection byproduct, N-nitrosodimethylamine(NDMA) formation was studied according to chlorine, nitrogen, and carbon composition related to monochloramine and dimethylamine(DMA) concentrations. The highest NDMA formation was observed when the dimethylamine/monochloramine ratio was close to 1, and the formation was rapidly decreased when the ratio was less or greater than 1. The formation of NDMA increased with increasing chlorine/nitrogen ratio indicating the chlorine is a limiting factor. A rapid disinfection byproduct was formed at 72 hour contact time in this study. As the previous researches, pH was a significant factor for the NDMA formation.
Development of Turbid Water Prediction Model for the Imha Dam Watershed using HSPF
Yi, Hye-Suk ; Kim, Jeong-Kon ; Lee, Sang-Uk ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 760~767
A watershed model was constructed using HSPF(Hydrological Simulation Program - Fortran) for predicting flow and suspended solid in the Imha dam watershed. The whole watershed was divided into 33 sub-watersheds in the watershed model, which was calibrated for flow using measured data from 2001 to 2007. The accuracy of watershed model prediction was evaluated using statistical coefficients of R
(Correlation coefficient) and graphical comparison. Then, the model was calibrated for suspended solid using field data measured during 3 major rainfall events in July 2006, and then validated against data obtained in 2 rainfall events from July to August in 2007. Overall, the model showed good agreements with the field measurements for flow and suspended solid. The watershed model constructed in this study can provide flow and suspended solid entering the Imha reservoir and will be utilized for turbid water management in linkage with reservoir water quality models.
Effect of Solidified/Stabilized Sewage Sludge using Neutral Solidifying Chemical Agent and Alkaline Agent as Landfill Cover on Decomposition of Organic Matter in Lysimeter
Kim, Hye-Jin ; Park, Jin-Kyu ; Song, Sang-Hoon ; Lee, Nam-Hoon ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 768~774
To evaluate the effect of the solidified/stabilized sewage sludge on landfill sites, lysimeter tests were conducted. Lysimeters (LR1, LR2, and LR3) were filled with the material(Compost : Fodder : Sand = 10 : 10 : 80) and covered with different types of the cover soils, the G solidified sludge produced from the neutral solidifying chemical agent(LR1), the A solidified sludge produced from the alkali solidifying chemical agent(LR2), and the weathered granite soil(LR3). Those lysimeters were kept at the temperature controlled room with 30
for about 450 days. As the results, it was appeared LR2 > LR1 > LR3 that total gas production rate(L), gas production rate(L/VS(kg)) and cumulative gas(CO
) production. There were not significant differences at decrease of the COD
in the leachate from LR1 and LR3. Thus, it had been shown that the use of the G solidified sludge as cover soil did not affect the COD
in the leachate. The COD
from LR2 had been increased since around 250 days because solidified/stabilized sewage sludge became re-slurry. T-N and T-P from LR3 also were higher than LR1 and LR2. Also were, the use of the solidified/stabilized sewage sludge as a cover soil, therefore, did not affect the T-N and T-Pconcentrations in the leachate.
The Sludge Conditioning and Dewatering Properties of Waste Sludge with Metal Salt
Lee, Chang-Han ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 775~780
Sludge conditioning is widely used to improve aggregation and dewaterability of waste sludge in sludge treatment processes. The study aims to examine quantitative correlations between coagulant dosage and sludge cake dewaterability using three kinds of coagulants, such as an aluminum sulfate, a ferric chloride, and a poly aluminum chloride(PAC). When an aluminum sulfate, a ferric chloride, and a PAC were injected with 0.79
1.19 mmol/g, 0.61
1.25 mmol/g TSS, and 0.21
0.39 mmol/g TSS, respectively, specific resistances to filtration of the sludge were decreased at 95.0% or more. This study shows that the correlation between coagulant dosage per g sludge(D) and normalized specific resistance to filtration(R) could be expressed by the exponential functions.
Application of Statistical Analysis for Optimization of Organic Wastes Acidogenesis
Jeong, Emma ; Kim, Hyun-Woo ; Nam, Joo-Youn ; Oh, Sae-Eun ; Hong, Seung-Mo ; Shin, Hang-Sik ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 781~788
This study shows how to find out optimum co-substrate conditions and continuous operating parameters for maximum acidification of three different organic wastes - livestock wastewater, sewage sludge and food waste. Design of experiments and statistical analysis were revealed as appropriate optimization schemes in this study. Analyses of data obtained from batch tests demonstrated the optimum substrate mixing ratio, which was determined by maximum total volatile fatty acids(TVFA) increase and soluble chemical oxygen demand(SCOD) increase simultaneously. Suggested optimum mixing ratio of livestock wastewater, sewage sludge and food waste was 0.4 : 1.0 : 1.1 based on COD, respectively. Response surface methodology(RSM) contributed to find out optimum operating parameter - hydraulic retention time(HRT) and substrate concentration - for the semi-continuous acidogenic fermentation of mixed organic wastes. The optimum condition for maximum TVFA increase was 2 days of HRT and 29,237 mg COD/L. Empirical equations obtained through regression analysis could predict that TVFA increase would be 73%. To confirm the validity of the statistical experimental strategies, a confirmation experiment was conducted under the obtained optimum conditions, and relative error between theoretical and experimental results was within 4%. This result reflects that using statistical and RSM technique can be effectively used for the optimization of real waste treatment processes.
Biodeodorization of Trimethylamine by Biofilter Packed with Waste Tire-Chips
Park, Hun-Ju ; Kim, Chang-Gyun ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 789~797
This study was conducted to investigate removal characteristics of gaseous trimethylamine(TMA) through biofilter packed with waste tire-chips. The sludge in this experiment was collected from an activated sludge operated in a wastewater treatment facility treating malodorous pollutants. The nominal amount of collected sludge was inoculated through packing materials in the filter. The removal efficiencies for varying concentrations and SVs(Space velocity) were assessed based on TMA, COD
-N and EPS(Extracellular Polymeric Substances) in leachate, since biofilter had been steady-stately operated. The influent concentration of 10 ppm of TMA was removed to approximately 95% regardless of changing SV at 120 and 180 hr
, but it was lowered to 80 to 90% at SV 240 hr
. As influent concentration was gradually increased from 5 to 55 ppm, the removal efficiencies of TMA were initially high for 95% in the range of 5 to 10 ppm, but lowered to 80% for 10 to 30 ppm. As a part of kinetic study for TMA decomposition, V
(maximum substrate removal rate) and
(substrate infinity coefficient) were 14.3 g
and 0.043 g
, respectively while adapted period was shown in the range of 100 to 150 hr. Also, the EPS concentration was consistently observed from the leachate showing 100 to 200 ppm, which indicates that biofilm has been continuously formed and sustained throughout tire-chips packed reactor.
Metal Corrosion Mechanism by Sulfate-reducing and Iron-oxidizing Bacteria in Saline System and its Optimal Inactivation
Sung, Eun-Hae ; Han, Ji-Sun ; Kim, Chang-Gyun ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 798~807
Due to economic impairment derived from metal corrosion of pumping station installed around coastal area, it was needed for related cause-effect to be investigated for understanding practical corrosion behavior and providing proper control. This research was thus carried out to determine whether the microbe can influence on metal corrosion along with its control in the laboratory. For this study, groundwater was sampled from the underground pump station(i.e. I Gas Station) where corrosion was observed. Microbial diversity on the samples were then obtained by 16S rDNA methods. From this, microbial populations showing corrosion behaviors against metals were reported as Leptothrix sp.(Iron oxidizing) and Desulfovibrio sp.(Sulfur reducing) Iron oxidizing bacteria were dominantly participating in the corrosion of iron, while sulfate reducing bacteria were more preferably producing precipitate of iron. In case of galvanized steel and stainless steel, iron oxidizing bacteria not only enhanced the corrosion, but also generated its scale of precipitate. Sulfate reducing bacteria had zinc steel corroded greater extent than that of iron oxidizing bacteria. In the inactivation test, chlorine or UV exposure could efficiently control bacterial growth. However as the inactivation intensity being increased beyond a threshold level, corrosion rate was unlikely escalated due to augmented chemical effect. It is decided that microbial corrosion could be differently taken place depending upon type of microbes or materials, although they were highly correlated. It could be efficiently retarded by given disinfection practices.
Remediation of Mine Tailings Contaminated with Arsenic and Heavy Metals: Removal of Arsenic by Soil Washing
Kim, Tae-Suk ; Kim, Myoung-Jin ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 808~816
In the present paper, a study has been performed on remediating mine tailings around abandoned mine contaminated with high concentrations of arsenic and heavy metals using the technique of soil washing. Through the removal experiment of arsenic, the optimal conditions in the type and concentration of washing reagent, mixing ratio of mine tailings and washing reagent, and washing time were derived. Results showed that the most effective washing reagents to remove arsenic from mine tailings were oxalic acid(72% removal efficiency) and phosphoric acid(65%), while the oxalic acid(89%) was the most effective in removing the heavy metals containing Cu. In addition, the most economical and efficient washing concentration was 0.25 M and the most suitable washing time was 30 minutes. The optimal mixing ratio of mine tailings and washing reagent was 1 : 20(mass/vol) from the viewpoint of minimization of wastewater produced after the washing, as well as the washing effectiveness. Although the mixture of washing reagents did not help in removal of arsenic, it could lead to much elevated synergy effect on removing Cu and Zn, compared with the single reagent.
Microwave-assisted Photocatalytic Degradation of Methylene Blue
Kim, Yu-Bong ; Jo, A-Ra ; Ra, Deog-Gwan ; Park, Jae-Hyeon ; Kim, Sun-Jae ; Jung, Sang-Chul ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 817~822
In this study, the photocatalytic degradation of methylene blue in TiO
particles-dispersed water solution was carried out by irradiating microwave and UV light simultaneously. A microwave-discharged electrodeless UV lamp was developed to use microwave and UV simultaneously for photocatalytic reactions. The results of photocatalytic degradation of methylene blue showed that the decomposition rate increased with the microwave intensity, the circulating fluid velocity, and the amount of TiO
particles and auxiliary oxidizing agents added. Especially, the rate constant of H
-added photocatalytic reaction increased about three times from 0.0075 min
to 0.0250 min
when microwave was additionally irradiated. This study demonstrates that the microwave irradiation can play a very important role in photocatalytic degradation using peroxides although it is not easy to quantitatively assess the effect of microwave on photocatalytic reactions from the experimental data of this study.
Color Removal of Rhodamine B by Photoelectrochemical Process using Powder TiO
Kim, Dong-Seog ; Park, Young-Seek ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 823~830
The feasibility study for the application of the photoelectrocatalytic decolorization of Rhodamine B(RhB) was performed in the slurry photoelectrochemical reactor with powder TiO
. The photoelectrocatalytic process was consisted of powder TiO
, Pt electrode and three 8 W UV-C lamps. The effects of operating conditions, such as current, electrolyte, air flow rate and electrode material were evaluated. The experimental results showed that optimum TiO
dosage and current in photoelectrocatalytic process were 0.4 g/L and 0.02 A, respectively. It was found that the RhB could be degraded more efficiently by this photoelectrocatalytic process than the sum of the two individual oxidation processes(photocatalytic and electrolytic process). It demonstrated a synergetic effect between the photo- and electrochemical catalysis. Photoelectrocatalytic process was affected to air flow rate and optimum air flow rate was 2 L/min. The electrode material and NaCl effect of decolorization of RhB were not significant within the experiment conditions.
The Characteristics of Microbial Population Community Structure by an Addition of External Carbon Source in BNR Process for Low C/N Ratio Sewage Treatment
Yoon, Cho-Hee ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 831~838
This study investigated the characteristics of nitrogen removal and microbial community in a lab-scale A
O activated sludge process filled with the fluidized media at an aerebic basin. The change of microbial community was monitored based on quinone profiles of activated sludge according to feeding sewage with/without external carbon source. Low C/N ratio(COD
/T-N of 1.24) sewage was fed. The obtained results from this study were as follows; Ubiquinone(UQ) in the influent was in the descending order of UQ-8, UQ-10 and UQ-9. Menaquinone(MK) was simpler and much less than UQ. The ratio of UQ/MK was less than 0.41 and the dissimilarity was below 0.26. Without an external carbon source, MK-8 was the dominant species and there were 3 kinds of quinone species and low DQ and EQ values in an anaerobic basin. The ratio of UQ/MK increased to 2.3 in an anoxic basin. In an oxic basin, UQ-7 and UQ-8 were the dominant species. UQ-7 was dominating in suspended microorganisms, while UQ-8 was in attached microorganisms. With an external carbon source addition, MK-8 decreased but UQ-8 increased in an anaerobic basin. So did quinone species, DQ and EQ values. There was also a change in an anoxic basin with the improvement of denitrification. UQ-8 decreased instead, MK-7 and MK-8 increased. UQ/MK ratio decreased 2.3 to 1.4. It means that the dominant species change from Pseudomonas sp. to Bacillus and Micrococcus species. etc. In an oxic basin, UQ-8 replaced UQ-7 in suspended microorganisms and UQ-10 replaced UQ-8 in attached microbials. This seemed related with the growth of Nitrosomonas and Nitrobactor species.
Reduction of Dehydrated Cake by the Optimization of Flocculation Factors and the Single Flocculant/Dual Flocculation System
Kim, Hyung-Jun ; Bae, Young-Han ; Lee, Sang-Hee ;
Journal of Korean Society of Environmental Engineers, volume 30, issue 8, 2008, Pages 839~846
The flocculation characteristics of polyacrylamide base flocculants were estimated to reduce the moisture content of the dehydrated cakes. The dewaterability for sewage sludge was found to have a marked effect depending on the flocculant type, agitating speed and time, kind of dissolution water, etc. The optimal agitating speed and time were 700 rpm and 3 sec, respectively, in this experimental condition. and the dewaterability was proportion to the agitating speed upto 700rpm. When recycle water as the dissolution water was used, the solution viscosity of all kind of flocculants was decreased. However, the change of its viscosity are not proportioned to the dewaterabilities for each flocculant. Flocculation system of combinations of the first and sencond flocculation using single flocculant was investigated. Effects of the ratio of first and second dosage for dual flocculation on the dewaterability were also investigated. The optimum conditions of dual flocculation system are 75% and 50% as first dosages for low and high viscous flocculant for total dosage of common flocculation, respectively. Based on the results, an overall mechanism of dual flocculation system is proposed and it is envisaged that optimization of flocculation processes in this way can result in considerable savings in cost.