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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Water and Wastewater
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Journal DOI :
The Korean Society of Water and Wastewater
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Volume & Issues
Volume 22, Issue 6 - Dec 2008
Volume 22, Issue 5 - Oct 2008
Volume 22, Issue 4 - Aug 2008
Volume 22, Issue 3 - Jun 2008
Volume 22, Issue 2 - Apr 2008
Volume 22, Issue 1 - Feb 2008
Selecting the target year
Technical Reports : The evaluation of T-P removal and dewaterability under the operation change in KIDEA process
Yeon, Seung-Jun ; Her, Hee-Seung ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 179~182
Technical Reports : Enhancement of Removal Efficiency in a Bio-Reactor by External Carbon Supply
Choi, In-Sik ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 183~186
Substrate Interactions in the Biodegradation of Volatile Organic Compounds by a Yeast Strain
Jang, Hyun-Sup ; Jeong, Mi-Young ; Shin, Shoung-Kyu ; Song, Ji-Hyeon ; Hwang, Sun-Jin ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 187~193
Biological removal capacities for volatile organic compounds (VOCs) were determined using a yeast strain, Candida tropicalis. In this study, VOCs including toluene, benzene, p-xylene, and styrene as single substrates or mixtures were tested in the batch culture of the yeast strain. In addition, a kinetic model was applied to evaluate substrate interactions between the VOCs. The yeast strain was able to biodegrade each VOC effectively as a growth substrate, implying it could applied to wide range of VOCs. When the yeast strain was subjected to VOCs in mixtures, the biodegradation rate of one substrate were either increased (stimulated) or decreased (inhibited) by the presence of the others. Both benzene and toluene were inhibited by the other VOCs, and substrate interaction parameters estimated in the model indicated that styrene was the strongest inhibitor for the benzene and toluene biodegradation. Meanwhile, the biodegradation of p-xylene and styrene was stimulated by the presence of either benzene or toluene. The biodegradation rate of p-xylene was significantly increased especially by the presence of toluene, and the styrene biodegradation was enhanced greatly by the benzene addition. The results of the substrate interaction by the yeast strain suggest that the biodegradation rates for the VOCs in mixtures should be carefully evaluated. Furthermore, the competitive inhibition coefficient could be applied as a useful index to determine the substrate interaction
Distribution of average intervent times between adjacent rainfall events for overflow risk-based design of storm-water infiltration basin
Kim, Dae-Geun ; Park, Sun-Jung ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 195~203
This study collected the latest 30-year (1976~2005) continuous rainfall data hourly recorded at 61 meterological observatories in Korea. The continuous rainfall data was divided into individual rainfall events. In addition, distribution charts of average intervent times between adjacent rainfall events were created to facilitate the application to the overflow risk-based design of storm-water infiltration basin. This study shows that the one-parameter exponential distribution is suitable for the frequency distribution of the average intervent times for the domestic rainfall data. Distribution charts of the average intervent times were created for 4 hour and 6 hour of storm separation time, respectively. The inland Gyeongsangbuk-do and Western coastal area had relatively longer average intervent times, whereas Southern coastal area and Jeju-do had relatively shorter average intervent times.
Bacterial regrowth in biofilms formed in granular activated carbon filter adsorbers and the bacterial isolation and identification
Lee, Gyu-Cheol ; Park, Jong-Geun ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 205~212
This study aimed to investigate the biofilm formation, bacterial regrowth, and bacterial community structure in the granular-activated carbon (GAC) filter adsorbers (FAs) used in water treatment plants. In 2005 and 2006, raw water, settled water, GAC FA by depth, and filtered water were collected twice a year from water treatment plants (WTPs) B and S. The number of heterotrophic bacteria, including mesophilic and psychrophilic bacteria, in such collected waters was investigated along with the total number of coliforms therein. Heterotrophic bacteria were detected in most samples, mainly at the surface layers of the GAC FAs, and fewer such bacteria were found in the lower and bottom layers. An increase in the bacterial number, however, was observed in the samples from various depths of the GAC FAs in WTPs B and S compared with the surface layers. An increase in the bacterial number was also detected in the filtered water. This may indicate that there is a regrowth of the bacteria in the GAC FA. Considering, however, that heterotrophic bacteria were not found in the filtered water, it can be deduced that most bacteria are removed in the chlorination process. Coliforms were detected at the surface layer of the GAC FAs, but their regrowth was not observed. MicroLog systems were used to identify the bacteria community distribution. Eight genera and 14 species, including Pseudomonas spp., were detected in WTP B, and 8 genera and 9 species, including Aeromonas spp., in WTP S. Further studies are required to elucidate their role in the biofilms in water treatment processes.
Prediction Models to Control Pro-chlorination in Water Treatment Plant
Shin, Gang-Wook ; Lee, Kyung-Hyuk ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 213~218
Prediction models for post-chlorination require complicated information of reaction time, chlorine dosage considering flow rate as well as environmental conditions such as turbidity, temperature and pH. In order to operate post-chlorination process effectively, the correlations between inlet and outlet of clear well were investigated to develop prediction models of chlorine dosages in post-chlorination process. Correlations of environmental conditions including turbidity and chlorine dosage were investigated to predict residual chlorine at the outlet of clear well. A linear regression model and autoregressive model were developed to apply for the post-chlorination which take place time delay due to detention in clear well tank. The results from autoregressive model show the correlationship of 0.915～0.995. Consequently, the autoregressive model developed in this study would be applicable for real time control for post chlorination process. As a result, the autoregressive model for post chlorination which take place time delay and have multi parameters to control system would contribute to water treatment automation system by applying the process control algorithm.
Evaluation of bioflocculation and settling characteristics for MLSS from a Biological Nutrient Removal Plant
Lee, Byong-Hi ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 219~225
Evaluating and designing secondary clarifier require to define characteristics of influent MLSS (Mixed Liquor Suspended Solids). In this study, bioflocculation and settling characteristics for MLSS from a Biological Nutrient Removal (BNR) plant located in near Seoul were measured. MLSS concentrations in bioreactor were about 2,500mg/L in summer and about 4,000mg/L in winter, respectively. Tests showed that there was not much bioflocculation occurred in secondary clarifier. Average ESS/DSS (Effluent Suspended Solids/Dispersed Suspended Solids) was 100%. From the settling tests, ZSV (Zone Settling Velocity) and settling constant (n) in Vesilind equation were estimated at different MLSS temperatures. SVI (Sludge Volume Index) and SSVI (Stirred Sludge Volume Index) were also measured at different temperatures. It was found that ZSV was positively correlated with temperature and n was inversely proportional to temperature. SVI and SSVI had very similar values at about 25℃ of MLSS, However, SVI had more than 2 times higher values than SSVI at below 20℃ of MLSS. Temperature effect must be considered to design and evaluate secondary clarifier.
Masking Effect of Chlorine on Algae-related Taste and Odor in Drinking Water Supplies
Kim, Young-Il ; Lee, Yu-Jeong ; Shin, Heung-Sup ; Bae, Byung-Uk ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 227~232
The masking effect of chlorine on algae-related taste and odor(T&O) compounds has long been an important issue for water suppliers. In this study, masking experiments with chlorine were performed on two kinds of treated water and one of raw water. After adding chlorine(0 to 0.8 mg/L) to water samples, odor intensity was evaluated by a newly developed sensory method(2-out-of-5 odor test) for three days along with the measurement of residual chlorine concentration. Even though the relationship between the residual chlorine concentration and odor reported by the sensory analysts was not always coincident, it was proved that residual chlorine more than a certain concentration could completely mask both added geosmin and naturally occurring T&O compounds. For the sand-filtered water spiked with 10 ng/L of geosmin, 0.12-0.18 mg/L of residual chlorine was necessary to achieve complete masking. In the case of GAC-filtered water, 10 ng/L of spiked geosmin was completely masked by 0.15-0.1 mg/L of residual chlorine. Combined ozone and GAC was not enough to treat raw water spiked with 300 ng/L of geosmin. In this experiment, sensory analysts were able to detect earthy or musty odors from the treated water. From a masking experiment with raw water taken from the Daechung Reservoir, it was found that fishy odor was more difficult to mask with chlorine than earthy odor. As the chlorine residual declined, the analysts began to notice the original odor and the fishy odor was noticed earlier than the earthy odor.
Estimation of Optimum Capacity for Rainwater Storage Facilities based on Mass Balance and Economic Analysis
Kim, Young-Min ; Lee, Sang-Ho ; Lee, Jung-Hun ; Kim, Ree-Ho ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 233~238
Recently, rainwater harvesting facilities have increasingly constructed mainly in elementary schools and government buildings. Nevertheless, few methods are available for efficient planning and design of rainwater harvesting facilities by considering the weather conditions and purpose of rainwater management in each site, which may lead to a construction of uneconomic facilities. The current method estimates the size of rainwater storage tank by multiplying the size of building or plottage with a certain ratio and has many limitations. In this study, we first developed a method for planning and design of rainwater storage facilities using RainstockTM model, which is based on mass balance, and economic analysis. Then, the model was applied for the design of a rainwater harvesting facility in a building with the catchment area of 1,000 ㎡. The model calculation indicated that the economic feasibility of rainwater harvesting depends on not only the size of storage tank but also the water usage rate. When the water usage rate is 1 ㎥/day, the rainwater harvesting facility is not cost-effective regardless of the size of the storage tank. With increasing the water usage rate, the economical efficiency of the facility was improved for a specific size of the storage tank. Based on the model calculation, the optimum tank sizes for 5 ㎥/day and 10 ㎥/day of water usage rates were 24 ㎥ and 57 ㎥, respectively. It is expected that the model is useful for optimization of rainwater storage facilities in planning and designing steps.
Analysis of relationship between daily inflow rate fluctuation and surface wave transfer velocity in water treatment processes
Park, No-Suk ; Lim, Seong-Eun ; Kim, Seong-Su ; Hwang, Jun-Sik ; Jung, Nahm Chung ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 239~243
The fluctuation of inlet flow to a water treatment plant makes a serious problem that it can change the outlet flow-rate from each process abruptly, and ultimately occur the detachment of the attached particles inside each unit process. Also, since it takes very short time for the surface wave occurred from the fluctuation of inlet flow to reach the latter processes, it is impossible for operators to cope with that stably. Therefore this study was conducted to suggest the methodology for accurately predicting the travel time of surface wave occurred from the fluctuation of inlet flow to reach the latter process. Through the experiment, which was carried out for the full-scale water treatment plants (capacity : 2,000m3/d), it could be confirmed that the flow rate fluctuation from equalization tank produce the surface wave. And the wave transfer velocity is a function of the hydraulic radius and the length of each open type tanks which are comprised in the latter processes.
The comparison of the adsorption characteristic of heavy metals onto soil mixed with food compost using retardation coefficient
Joo, You-Yoen ; Kang, Seon-Hong ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 245~250
Adsorption experiment was carried out to find the adsorption capacity and characteristics of heavy metals(Cd, Pb) onto soil and mixed soil with food compost. Result showed that mixed soil having higher organic content adsorbed more heavy metal than soil, indicating that food compost can be used effectively to prevent soil pollution. Linear adsorption isotherm which adopted to find the adsorption characteristics was used to calculate Retardation Factor(R). The value of Retardation Factor(R)s of Pb and Cd in mixed soil, found as 34.54, 24.42 respectively, are higher than those in soil which were found as 4.64, 3.67, respectively. The value of Retardation Factor(R) using Freundlich adsorption isotherm could be presented by the functions of concentration and showed similar result as the linear one. But Freundlich adsorption isotherm showed higher relationship than linear one and the retardation factor(R) from freundlich adsorption isotherm was thought as more effective method to assess adsorption capacity because it could reflect gradient and intercept of the isotherm.
The assessment of the adsorption and movement of Pb in mixed soil with food compost using model
Joo, You-Yoen ; Kang, Seon-Hong ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 251~257
Food compost, having a higher organic contents than soil, could be an alternative material to prevent the proliferation of heavy metals contamination in soil. In this study we used a convection-dispersion local equilibrium sorption model(CDE) and a two-site non-equilibrium sorption model to find the effects on the adsorption and transportation of Pb by mixing food compost with soil and we also tried to find the effect of velocity and concentration of the injected solution on the characteristics of Pb. We measured Pb concentrations in injection-liquid and in effluent, and then applied them to CXTFIT program. As a result of column experiments, some parameters(D, R, β, ω) used in two-site non-equilibrium adsorption model were obtained. Characteristics of Pb adsorption and transport were analyzed using the parameters(D, R, β, ω) obtained from the CXTFIT program, We could know that mixed soil with food compost showed a higher adsorption capacity from the retardation factor(R) calculated from the breakthrough curve(BTCs) of Pb. Rs of soil and mixed soil are 20.45, 37.45 respectively, indicating that the adsorption and the transportation characteristics could be accessed quantitatively by using of two-site non-equilibrium sorption model.
A Study on characteristics analysis of autotrophic denitrification microbial community using sulfur granule
Yoon, Su Chul ; Joo, Jae-Young ; Nam, Duck-Hyun ; Park, Chul-Hwi ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 259~265
The representative microorganism of autotrophic denitrification using sulfur granule, oxidizes the reduction from S and performs denitrification by reducing NO3--N to N2 gas. The sampling of autotrophic denitrification microorganisms has been performed from foreshore sludge, condensed sludge, and active sludge, but the analysis of autotrophic denitrification microbial community characteristics has been lacking. Based on the separation and identification of each sample using the PCR and DGGE methodologies, many types of sulfuric microorganisms and autotrophic denitrification microorganisms were found.
Determination of operating factor and characteristics of membrane fouling on hybrid coagulation pretreatment-UF system in drinking water treatment
Moon, Seong-Yong ; Yun, Jong-Sub ; Kim, Seung-Hyun ;
Journal of Korean Society of Water and Wastewater, volume 22, issue 2, 2008, Pages 267~274