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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Korean Society of Hazard Mitigation
Journal Basic Information
Journal DOI :
Korean Society of Hazard Mitigation
Editor in Chief :
Moo Jong Park
Volume & Issues
Volume 11, Issue 6 - Dec 2011
Volume 11, Issue 5 - Oct 2011
Volume 11, Issue 4 - Aug 2011
Volume 11, Issue 3 - Jun 2011
Volume 11, Issue 2 - Apr 2011
Volume 11, Issue 1 - Feb 2011
Selecting the target year
Experimental Study on the Fire Resistance of Concrete Filled Steel Tubes according to Concrete Compressive Strengths
Kwon, In-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 1~8
DOI : 10.9798/KOSHAM.2011.11.2.001
Concrete filled steel tubes(CFST) is considered as a column having better structural stability and better performance of fire resistance than that made with H-section and hollow section in itself. To get the fire resistance of the CFST, two kinds of concrete strength were used, 21 MPa, 40 MPa and 4 sorts of the applied loads were calculated and used to the specimens such as 3.5 m long, round and rectangular section. After various fire tests under 4 sorts of load ratios, the fire resistance of the CFST is not possible to get over 1 hour because of the rapid decrease of concrete strength. The below 50% of the applied load is recommended to obtain over 1 hour fire resistance of the CFST.
Performance-based Fire Protection Design of Domestic Super High-rise Buildings - Evaluation by ASET and RSET -
Roh, Hyeong-Ki ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 9~13
DOI : 10.9798/KOSHAM.2011.11.2.009
The Performance-based fire protection design required to construct super high-rise building is the active measure for the evaluation of fire risks and the establishment of fire protection systems on the basis of engineering analysis, which is more efficient and proper than existing prescriptive-based design. This study applied time-line analysis of RSET is required safe egress time and ASET is available safe egress time with the fire and evacuation simulation to analyze. The result of this study showed the sprinkler system increased ASET and fire detection and alarm system reduced RSET efficiently. Reduced evacuation time influences to secure the life safety. Also it is essential to maintain the fire suppression system and fire detection & alarm system properly. Database of fire movement and evacuation action program are useful for the performance-based design.
An Experimental Study of Fatigue and Static Behavior for Composite Deck Member
Kim, Doo-Hwan ; Kim, Young-Chan ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 15~21
DOI : 10.9798/KOSHAM.2011.11.2.015
It is required to accumulate experimental datum that make the theories easy to general technicians in order to use composite material widely on construction field. Therefore, we intend to present base technologies that evaluate static and fatigue performance according to the FRP deck section and offer the basis datum for FRP deck analyses and the design standards. As results of static tests, it can be shown that specimen with fabric direction has higher rigidity than that with normal to fabric direction and convergence for the datum. Due to this reason, it has more stable behavior by structural characteristics of matrix arrangement during destruction. For the fatigue tests, we found that by increasing the number of test repetition, test specimen with fabric direction had an crack just before the destruction, and the contact surface was detached.
Bond Splitting Strength and Behavior of GFRP Reinforcement with Roughened Surface
Moon, Do-Young ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 23~29
DOI : 10.9798/KOSHAM.2011.11.2.023
In this experimental study, bond splitting strength and behavior were evaluated through pull-out tests. The tests were conducted on a GFRP rebar with roughened surface which was produced by Canadian manufacturer. The used variables in this study were rebar diameter, cover depth and compressive strength of concrete. For each variable, five specimens were made and tested to obtain good results. The bond splitting behavior was investigated from the relationship of pull-out force and slip. The experimental bond splitting strength was compared with the predicted strength obtained from the equations presented by some researchers. The results of the comparison demonstrated that the strength could be predicted well by using the Harajli et al`s equation.
Reconstruction of Two-phase Polycrystalline Microstructures of Mechanical Isotropy
Chung, Sang-Yeop ; Han, Tong-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 31~37
DOI : 10.9798/KOSHAM.2011.11.2.031
Understanding of the phase distribution in a multi-phase polycrystalline material is important because it can affect material properties and mechanical behaviors significantly. In this research, probability functions (two-point correlation and lineal-path functions) are used to represent the phase distributions of microstructures. The two-phase microstructures with random phase distribution are reconstructed using probability functions and compared with original samples. Mechanical behaviors of the virtual samples for different directions are evaluated using a finite element method. It is confirmed that microstructures with the same statistical characteristics can be generated using the reconstruction method. It is also demonstrated that the characteristics of the probability functions and mechanical reponses between the original and reconstructed microsturctures are statistically identical.
Evaluation of Effect of Plastic Gradient on the Behavior of Single Grain inside Polycrystalline Solids
Chung, Sang-Yeop ; Han, Tong-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 39~44
DOI : 10.9798/KOSHAM.2011.11.2.039
Plastic gradient from geometrically necessary dislocation(GND) can strongly affect micro-scale plastic behavior of polycrystalline solids. In this research, mechanical behavior of polycrystalline solid is investigated using the finite element method incorporating plastic gradient from GND effect. Gradient hardness coefficient and material length parameter are used to evaluate the effect of the plastic gradient on the behavior of materials. Sensitivity of the modeling parameters on the plastic gradient from GND is presented and effects of plastic gradient and material parameters on the behavior of single crystal inside a polycrystalline aggregate are investigated. It is confirmed that the plastic gradient from GND amplifies hardening response of polycrystals and affects single crystal behavior embedded in polycrystalline solids.
Study on The Heat Transfer and Mechanical Modeling of Fiber-Mixed High Strength Concrete
Shin, Young-Sub ; Han, Tong-Seok ; Youm, Kwang-Soo ; Jeon, Hyun-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 45~52
DOI : 10.9798/KOSHAM.2011.11.2.045
To improve fire-resistance of a high strength concrete against spalling under elevated temperature, fibers can be mixed to provide flow paths of evaporated water to the surface of concrete when heated. In this study, the experiment of a column under fire and mechanical loads is conducted and the material model for predicting temperature of reinforcement steel bar and mechanical behavior of fiber-mixed high strength concrete is suggested. The material model in previous studies is modified by incorporating physical behavior of internal concrete and thermal characteristics of concrete at the elevated temperature. Thermo-mechanical analysis of the fiber-mixed high strength concrete column is conducted using the calibrated material model. The performance of the proposed material model is confirmed by comparing thermo-mechanical analysis results with the experiment of a column under fire and mechanical loads.
Some Thoughts on the Issues and Improvement Strategies for Coastal Zone Safety through Field Survey-Safety Standards
Yi, Gyu-Sei ; Sung, Ik-Hyun ; Bae, Sang-Won ; Lim, Nam-Hyoung ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 53~57
DOI : 10.9798/KOSHAM.2011.11.2.053
Recently, the risk of safety accidents in the coastal zone has been increased due to revitalization of marine leisure and tourism. The effective measures, however, to prevent safety accidents in the coastal zone have not taken with increasing rate of the accidents. The nature of land and sea should be taken into account properly when the countermeasures to prevent the safety accidents in the coastal zone are devised, since the characteristics of land and sea are mixed in the environmental condition of the coastal zone. Through the field survey, this study analyzes the current problems on the safety in the coastal zone. Also, it suggests the future direction of the safety standards in the coastal zone on the basis of the safety improvement direction in the coastal zone.
Vibration Serviceability Evaluation for Pedestrian of Concrete Cable-stayed Bridge by Experimental Method
Kang, Sung-Hoo ; Choi, Bong-Hyun ; Park, Sun-Joon ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 59~66
DOI : 10.9798/KOSHAM.2011.11.2.059
In this study, the vibration serviceability of pedestrian by travelling vehicles on the cable-stayed bridge with concrete tower was studied. Experiment variables were considered travelling speed of vehicles, pavement state of asphalt on the deck and weight of vehicles, preferentially. Especially, pavement grade states were considered by A and C grades by BMS (Bridge Management System) standard. The incremental ratio extent of vibration acceleration responses, asphalt pavement grade C over A, was construed to 1.23~1.43. Only, these results are valid within extent of the Scaled-Weight 228.0~1161.9 km/h kN. The vibration equations for acceleration responses prediction of bridge deck were proposed into three types, reliability 50%, 90%, 95% respectively. These equations can consider asphalt pavement grade, and the vehicle`s weight and travelling velocity, which are the source of vibration, are combined into the term called, `Scaled Weight`.
Development of Non-Shrink Mortar Grouting Type Splice Sleeve
Lee, Young-Ho ; Song, Jae-Joon ; Cho, Jae-Young ; Kim, Do-Hak ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 67~73
DOI : 10.9798/KOSHAM.2011.11.2.067
This study aims to develop an economical precast hollow concrete column with high constructability which consists of only splice sleeve and general reinforcing bar without using PC tendons in order to reduce the construction period and cost. With this purpose, this study performed the finite element analysis and tension test by using some variables such as length of sleeve, diameter of rebar and curing method for suggesting a grouting type splice sleeve which is a new type joint rebar and developing an optimized splice sleeve. As a result, the analysis on the tension performance of splice sleeve did not show any destruction caused by pull-out in reinforcing bar but it only occurred destruction of tension bar or bolt shear rupture from the mechanical defect of sleeve. Therefore, the experiment showed high performance in tension of the suggested splice sleeve and verified the application of precast hollow concrete column.
Energy Ratio Factor and Phase Angle Based Fatigue Prediction Model for Flexible Pavements
Kim, Nak-Seok ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 75~80
DOI : 10.9798/KOSHAM.2011.11.2.075
The main objective of this research is to develop fatigue prediction model for flexible pavements using energy ratio factor and phase angle. The two parameters are considered as fundamental properties of time and temperature dependent viscoelastic asphalt concrete materials. The energy ratio factor is defined as the ratio of the pseudo-total cumulative dissipated energy to the cumulative dissipated energy to failure during the test. The phase angle between the stress and strain ware signals stems from the intrinsic the dependent asphalt mixture behavior. The phase angle was computed and the relationship between the initial mixture stiffness and the initial phase angle is presented. As a result, fatigue prediction model for flexible pavements was proposed using intrinsic properties of viscoelastic asphalt concrete materials.
A Study on Actual Conditions of Industrial Safety Regulations - Based on Petrochemical Plant -
Oh, Hyeong-Geun ; Baek, Dong-Seung ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 81~86
DOI : 10.9798/KOSHAM.2011.11.2.081
Without a special mineral resources in Korea, such as petrochemical industries, electronics and automotive industries to supply the basic material, but remains a key industry locations. Gongjeongsang dealing with hazardous materials, such as a fire or explosion hazard, and from this site sangjonhae safety regulations to protect human and material disaster prevention activities are focused. However, depending on the actual implementation of standardized safety regulations as necessary if not originally intended, proper objectivity and reliability of safety regulations, as well as impaired resulting in a waste of public and private administrative power and petrochemical industries and the competitiveness of the entire drop factor will. Accordingly, this study petrochemical plant is applied to a representative safety regulations, items for their safety are needed and these regulations as being implemented that was identified, according to a study, some of the need for regulation and implementation both in terms of reliability was low.
A Study on the Impermeability of Ground using N.D.S and S.M.I methods
Kim, Ji-Hwan ; Kim, Joon-Jeong ; Cho, Kook-Hwan ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 87~92
DOI : 10.9798/KOSHAM.2011.11.2.087
This paper describes a study on the permeability reduction of the riverbed ground during urban railway tunnel construction. The research is mainly concentrated on the study of the grouting or injection methods among permeability reduction methods which can be adapted in the riverbed ground. The design technology of grouting methods considering the long term hydro-geological behaviour in the riverbed, was suggested. Two injection methods namely, Natural Durable Stabilizer (N.D.S) and Space-Multi Injection Grouting (S.M.I) methods, were introduced as new approach methods which could be adapted to modify the riverbed ground. In order to evaluate the performance of the improved ground by the N.D.S and S.M.I method, a series of pilot tests including the field and laboratory permeability tests, were carried out in the river crossing tunnel construction sites. The results obtained from pilot test program, were also reviewed. The results, the grouting efficiency of the S.M.I method using the non-alkalimeter silica sol is better than that of N.D.S method using cement. In addition, it is anticipated that the current research results are contributed to develop the grouting design technology.
A Study on Seismic Retrofit Design of the Stabilized Piles by 1g Shaking Table Tests and Pseudo-static Analysis
Han, Jin-Tae ; Cho, Jong-Suck ; Yoo, Min-Taek ; Lee, Seung-Hyun ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 93~101
DOI : 10.9798/KOSHAM.2011.11.2.093
Korea has about 70% of its land classified as the mountain area, which has led to cut-slope being the result of substantial road and railway construction. However, there is currently a lack of research about the seismic retrofit design of a slope, even though many earthquakes have recently occurred at home and abroad. In this study, in order to investigate the stabilizing effect of piles against sliding during an earthquake, a series of 1 g shaking table tests and pseudo-static analyses were carried out. As a result, the stabilizing effect of piles against sliding during an earthquake was verified by the 1 g shaking table tests and the most effective result from the pseudo-static analyses was that the installation of the piles on the central part of the slope, where the failure surface included piles unlike the lower part and upper part of the slope. Furthermore, when the pile was installed on the central part of the slope, the change of the safety factor depending on the distance between the center of two piles was evaluated.
Assessment of the Effect of Geographic Factors and Rainfall on Erosion and Deposition
Yu, Wan-Sik ; Lee, Gi-Ha ; Jung, Kwan-Sue ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 103~112
DOI : 10.9798/KOSHAM.2011.11.2.103
This study aims to demonstrate the relationship between various factors and soil erosion or deposition, simulated from distributed rainfall-sediment-runoff model applications. We selected area, overland flow length, local slope as catchment representative characteristics among many important geographic factors and also used the grid-based accumulated rainfall as a representative hydro-climatic factor to assess the effect of these two different types of factors on erosion and deposition. The study catchment was divided based on the Strahler`s stream order method for analysis of the relationship between area and erosion or deposition. Both erosion and deposition increased linearly as the catchment area became larger. Erosion occurred widely throughout the catchment, whereas deposition was observed at the grid-cells near the channel network with short overland flow lengths and mild slopes. In addition, the relationship results between grid-based accumulated rainfall and soil erosion or deposition showed that erosion increased gradually as rainfall amount increased, whereas deposition responded irregularly to variations in rainfall. Within the context of these results, it can be concluded that deposition is closely related with the geographic factors used in this study while erosion is significantly affected by rainfall.
Analysis of the Variability of Annual Precipitation According to the Regional Characteristics
Kim, Gwang-Seob ; Kim, Jong-Pil ; Lee, Gi-Chun ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 113~125
DOI : 10.9798/KOSHAM.2011.11.2.113
In this study, recent trends of the annual precipitation, the annual maximum precipitation of different durations and the rain days over several thresholds(i.e. 0, 10, 20, 40, 60 and 80 mm/day) according to the different local features were analyzed using daily precipitation data of 59 weather stations between 1973 and 2009. To analyze the variability according to the regional characteristics, 59 weather stations were classified by elevations, latitudes, longitudes, river basins, inland or shore(east sea, south sea, west sea) area and the level of urbanization. Results demonstrated that overall trend of variables increases except rain day. Results according to the regional characteristics showed that the increase trend becomes stronger with elevation increase. The increase trend of Han river basin is largest and that of Youngsan river basin is smallest. Also the increase trend becomes stronger with latitude increase and that of East coast is larger than that of South coast since it may be caused by the regional difference of elevation. The increase trend of urban area is larger than that of rural area. Overall trend showed that increase trend becomes stronger with elevation and latitude increase.
Probabilistic Analysis of Independent Storm Events: 1. Construction of Annual Maximum Storm Event Series
Park, Min-Kyu ; Yoo, Chul-Sang ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 127~136
DOI : 10.9798/KOSHAM.2011.11.2.127
In this study, annual maximum storm events are proposed to determined by the return periods considering total rainfall and rainfall intensity together. The rainfall series at Seoul since 1961 are examined and the results are as follows. First, the bivariate exponential distribution is used to determine annual maximum storm events. The parameter estimated annually provides more suitable results than the parameter estimated by whole periods. The chosen annual maximum storm events show these properties. The events with the biggest total rainfall tend to be selected in the wet years and the events with the biggest rainfall intensity in the wet years. These results satisfy the concept of critical storm events which produces the most severe runoff according to soil wetness. The average characteristics of the annual maximum storm events said average rainfall intensity 32.7 mm/hr in 1 hr storm duration(total rainfall 32.7 mm), average rainfall intensity 9.7 mm/hr in 24 hr storm duration(total rainfall 231.6 mm) and average rainfall intensity 7.4 mm/hr in 48 hr storm duration(total rainfall 355.0 mm).
Probabilistic Analysis of Independent Storm Events: 2. Return Periods of Storm Events
Yoo, Chul-Sang ; Park, Min-Kyu ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 137~146
DOI : 10.9798/KOSHAM.2011.11.2.137
In this study, annual maximum storm events are evaluated by applying the bivariate extremal distribution. Rainfall quantiles of probabilistic storm event are calculated using OR case joint return period, AND case joint return period and interval conditional joint return period. The difference between each of three joint return periods was explained by the quadrant which shows probability calculation concept in the bivariate frequency analysis. Rainfall quantiles under AND case joint return periods are similar to rainfall depths in the univariate frequency analysis. The probabilistic storm events overcome the primary limitation of conventional univariate frequency analysis. The application of these storm event analysis provides a simple, statistically efficient means of characterizing frequency of extreme storm event.
Optimal Reservoir Operation Using Goal Programming for Flood Season
Kim, Hye-Jin ; Ahn, Jae-Hwang ; Choi, Chang-Won ; Yi, Jae-Eung ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 147~156
DOI : 10.9798/KOSHAM.2011.11.2.147
The purpose of multipurpose reservoir operation in flood season is to reduce the peak flood at a control point by utilizing flood control storage or to minimize flood damage by controlling release and release time. Therefore, the most important thing in reservoir operation for flood season is to determine the optimal release and release time. In this study, goal programming is used for the optimal reservoir operation in flood season. The goal programming minimizes a sum of deviation from the target value using linear programming or nonlinear programming to obtain the optimal alternative for the problem with more than two objectives. To analyze the applicability of goal programming, the historical storm data are utilized. The goal programming is applied to the reservoir system operation as well as single reservoir operation. Chungju reservoir is selected for single reservoir operation and Andong and Imha reservoirs are selected for reservoir system operation. The result of goal programming is compared with that of HEC-5. As a result, it was found that goal programming could maintain the reservoir level within flood control level at the end of a flood season and also maintain flood discharge within a design flood at a control point for each time step. The goal programming operation is different from the real operation in the sense that all inflows are assumed to be given in advance. However, flood at a control point can be reduced by calculating the optimal release and optimal release time using suitable constraints and flood forecasting system.
Optimal Designs of Urban Watershed Boundary and Sewer Networks to Reduce Peak Outflows
Lee, Jung-Ho ; Jun, Hwan-Don ; Kim, Joong-Hoon ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 157~161
DOI : 10.9798/KOSHAM.2011.11.2.157
Although many researches have been carried out concerning the watershed division in natural areas, it has not been researched for the urban watershed division. If the boundary between two urban areas is indistinct because no natural distinction or no administrative division is between the areas, the boundary between the urban areas that have the different outlets (multi-outlet urban watershed) is determined by only designer of sewer system. The suggested urban watershed division model (UWDM) determines the watershed boundary to reduce simultaneously the peak outflows at the outlets of each watershed. Then, the UWDM determines the sewer network to reduce the peak outflow at outlet by determining the pipe connecting directions between the manholes that have the multi-possible pipe connecting directions. In the UWDM, because the modification of the sewer network changes the superposition effect of the runoff hydrographs in sewer pipes, the optimal sewer layout can reduce the peak outflow at outlet, as much as the superposition effects of the hydrographs are reduced. Therefore, the UWDM can optimize the watershed distinction in multi-outlet urban watershed by determining the connecting directions of the boundary-manholes using the genetic algorithm. The suggested model was applied to a multi-outlet urban watershed of 50.3ha, Seoul, Korea, and the watershed division of this model, the peak outflows at two outlets were decreased by approximately 15% for the design rainfall.
Study on Guideline for the Selection of Small Stream Implementation Projects
Cheong, Tae-Sung ; Kang, Byung-Hwa ; Jeong, Sang-Man ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 163~170
DOI : 10.9798/KOSHAM.2011.11.2.163
Natural stream disasters due to a localized torrential and flash flood has occurring in a small stream especially un-implemented small stream. The survey results during ten years from 2001 to 2010 show that the small stream implementation projects (SSIPs) expenses is increasing with the damages is generally decreasing with variableness in which SSIPs is contributing to disaster prevention in a small stream. This study develop guideline for the selection of SSIPs to support high risk stream at first and save the small streams located on the mountainous area, prevention area and agricultural area which streams have no implementation effects. Developed sub items in guideline are evaluated by stream data collected from 212 small streams where it is proved that sub distance of each item are well arranged by normal distribution. This SSIPs is useful for selecting high risk small stream at first to maximize disaster risk reduction with minimum SSIPs expenses. Also, this SSIPs is used for leading to save small stream on the upstream to minimize flood damages on the down stream with selection a SSIP purchasing agricultural land for preparing flood plane.
Tsunami Force Acting on Coastal Structures
Hong, Seong-Soo ; Ha, Tae-Min ; Cho, Yong-Sik ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 171~177
DOI : 10.9798/KOSHAM.2011.11.2.171
Tsunami forces acting on coastal structures have not been relatively much paid attention by researchers. However, they should be appropriately reflected in design of coastal and harbor facilities. The temporary and permanent tsunami shelters have to be chosen to resist stably against unexpected tsunami forces. There have been only few numerical studies on the tsunami forces acting on coastal and harbor structures. In this study, a practical prediction of tsunami forces is carried out by using a two-dimensional numerical model.
Evaluation of Hydroxyl radical Formation and Energy Distribution in Photolysis Reactor
Nam, Sang-Geon ; Hwang, An-Na ; Cho, Sang-Hyun ; Lim, Myung-Hee ; Kim, Jee-Hyeong ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 179~183
DOI : 10.9798/KOSHAM.2011.11.2.179
In this study, photochemical effects (OH radical formation) in the photoreactor was investigated to analyze UV-C intensity distribution. In addition, The influence radius of the UV-C lamp was measured at various dose of
(Degussa P-25). The photoreactor used in this study was bath type reactor which is made by acrylic and the UV-C lamp (SANKYO DENKI, wavelength : 254 nm, Diameter : 2.2 cm, Length : 18.5 cm) was used as photo source. The maximum electric power consumption of the UV lamp was 10.5 W. The OH radical formation by UV-C was measured by KI dosimetry methods. From the results, the effective OH radical formation was occurred under the following condition. The reasonable distance of UV-C lamp is within 13 cm and the intensity of UV-C lamp should be more than 0.367 mW/
. Moreover, the concentration of catalyst affects on the influence radius of the UV lamp.
Effect of Influent COD Fraction on Nitritation from Wastewater and Piggery wastewater
Gil, Kyun-Gik ; Im, Ji-Yeol ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 185~192
DOI : 10.9798/KOSHAM.2011.11.2.185
BNR process is an effective method to remove high strength nitrogen included in wastewater and piggery wastewater. There have been many former studies about the induction of nitritation which have many advantages than full nitrification and the impacting factors on nitritation. Especially, it is reported that organic matter has a relation with nitritation. In this study, laboratory sacle reactor was operated using effluent of anaerobic digester, piggery wastewater and anaerobic digester effluent of piggery wastewater. After analyzing the operating results, the impact of organic matter on nitritation was analyzed by classified COD fractions. It was showed that nitritation is affected by organic matter especially by Ss. In conclusion, organic matter should be managed not just as a single gross parameter but in a classified form.
Reduced Loads Characteristics Comparison Between Permeable Pavement and Non-point Pollutants Treatment Facility
Gil, Kyung-Ik ; Jeon, Hye-Sun ;
Journal of Korean Society of Hazard Mitigation, volume 11, issue 2, 2011, Pages 193~198
DOI : 10.9798/KOSHAM.2011.11.2.193
This study aimed to provide basic data for permeable pavement application upon design and installation stages by analyzing the effect of permeable pavement used on the facility area rather than using non-point pollutants treatment facility upon development business in accordance with recent trend. To perform this study, the area of development target was separately applied as impermeable and permeable developments so as to compare and analyze the economics of cut pollution load and installation construction cost. Consequently, the processing amount and cut load of non-point pollutant sources are influenced much by permeable and impermeable developments, and it was turned out to be better to develop target river area as permeable area rather than installing non-point pollutants treatment facility of equipment type or natural type upon development to yield smaller discharge load. If we can prepare a countermeasure regulating impermeable area ratio to certain level to manage non-point pollutants upon development based on this result, we can minimize the source of pollution caused by the development.