This thesis provides background information on DFS carried out by the government in an effort to reduce the accident rate, cases of DFS in other advanced countries to study their risk detection, risk assessment, risk control measures, and cases in which application of DFS during the designing phase succesfully led to reduction of the accident rate. Till now, the focus has been on incident responses after the occurance of accidents, it describes the importance of considering safety during the desining process through safety results and cases.

Emissions of polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurnas (PCDFs) in stack gas were analyzed from 21 municipal solid waste incinerators (MSWs) using high resolution gas chromatography equipment with a high resolution mass spectrometer (HRGC/HRMS) in 2015. The concentration of PCDDs/DFs was in the range 0.09 ~ 354.54 pg-TEQ/Sm3 based on the International Toxicity Equivalency Factor (I-TEF) and all MSWs complied with emission standards. The congener distribution of PCDDs/DFs was categorized into one group and two outliers via principal component analysis (PCA). Among the 17 PCDDs/DFs, 1,2,3,4,6,7,8-HpCDD showed the highest mass fraction (20.8%) and 2,3,4,7,8-PeCDF showed the largest TEQ contribution (42.9%).

The use of electrical and electronic products made of low specific gravity and easy processing plastics has increased alongside industrial development. As these products were abandoned, environmental problems such as Dioxine and Furan began to rise. Accordingly, through long-time reviews and discussions, the EU has implemented the Restriction of Hazardous Substances (RoHS) and the Waste Electrical and Electronic Equipment (WEEE) regulations. In addition, the Stockholm Convention was adopted in April 2011 to regulate wastes containing brominated flame retardants. Therefore, the Basel Convention issued technical guidelines and environmentally friendly treatments for wastes containing brominated flame retardants. Proper management and treatment plans that are suitable to Korea’s circumstances are required for Korea to respond to both conventions and changing trends in international POPs management. In this regard, the study identified domestic and international trends in environmental regulations and usages, obtained fundamental data for the management of waste containing brominated flame retardants, and investigated the current status of waste generation in Korea. The results of analyses were used to make a lab-scale incineration reactor as the basis for setting incineration temperature ranges for experiments. After incineration, five general air pollutants (O2, CO, CO2, SOx, and NOx) and three components of BRFs in emission gases and flooring were analyzed to identify whether the PBDEs in waste can be destroyed in a stable and environmental manner during heat treatment. In the analysis, HRMS was used for PBDEs and GC/MS/MS for TBBPA and HBCD. PBDD/DFs was proportionally increased in facilities that had high concentrations of PCDD/DFs during incineration. In conclusion, wastes containing brominated flame retardants in Korea can be incinerated in an environmentally friendly manner.

Recently, serious construction site accidents are increasing. At present, the accident rate of the whole industry is 0.5 ('15), while the accident rate of the construction industry is 0.75 ('15), which is 50% higher than the accident rate of the whole industry. In order to reduce the accident rate of the construction industry to the level of the accident rate of the whole industry, there are various methods such as compliance with specifications, drawing and specification, thorough supervision of management, most importantly, it is necessary to recognize that the safety management of construction work is not the work of the builder only, and that it is the task of all participants of the construction work (contractor, designer, builder, construction management). In addition, it should be based on the institutional part to support that. As a part of this, design for safety was introduced to prevent disasters occurrence in construction work. Design for safety was introduced to prevent disasters occurrence in construction work. In this study, we intend to elaborate domestic and overseas institutions and revitalization plans.

Recently, serious construction site accidents are increasing. At present, the accident rate of the whole industry is 0.5 ('15), while the accident rate of the construction industry is 0.75 ('15), which is 50% higher than the accident rate of the whole industry. In order to reduce the accident rate of the construction industry to the level of the accident rate of the whole industry, there are various methods such as compliance with specifications, drawing and specification, thorough supervision of management, most importantly, it is necessary to recognize that the safety management of construction work is not the work of the builder only, and that it is the task of all participants of the construction work (contractor, designer, builder, construction management). In addition, it should be based on the institutional part to support that. As a part of this, design for safety was introduced to prevent disasters occurrence in construction work. Design for safety was introduced to prevent disasters occurrence in construction work. In this study, we intend to elaborate domestic and overseas institutions and revitalization plans.

Establishment of emission concentrations of PCDDs and PCDFs in emission gases from 85 domestic crematories were measured. The relationship between PCDDs/DFs and several factors such as structure, equipment and operational state of the crematory is discussed. Furthermore, emission of PCDDs/DFs from all crematories in korea is estimated. The following results are obtained: (1) total concentration (2,3,7,8- substituted isomers) of PCDDs/DFs was 0.113 ~ 14.34 ng/ Sm3, whose TEQ concentration was 1.815 ng-TEQ/Sm3; (2) total emission of PCDDs/DFs from crematories in korea was estimated to be 1.815 g-TEQ/yr.

In this study, PCDDs/DFs concentrations in flue gases from 58 crematories and in fly ashes and bottom ashes (mainly bone) from several crematories were measured to grasp the present state of PCDDs/DFs emissions from crematories. The effects of several factors were discussed to prevent PCDDs/DFs emissions from crematories. Total concentration of PCDDs/DFs was ranged from 0.113 to 87.461 ng/Sm3 and toxic equivalent concentration was ranged from 0.019 to 15.347 ng-TEQ/Sm3. As the results obtained in this research, the following measures to reduce PCDDs/DFs emission are recommended for existing crematories: (1) keeping the temperature at < 800oC or < 850oC in main/secondary chambers during a whole cremation, (2) lowering the temperature in the dust collector, (3) installing the high efficiency dust collector and reducing dust concentration to less than 0.02 g/Sm3, and (4) installing the sampling point for monitoring of PCDDs/DFs.

Establishment of emission standard of dioxins from crematories has been needed for their efficient management in korea. In this study, we investigate related regulation, guideline and management of crematory at home and abroad. Either dioxin legal basis or management of countries are compared and analyzed respectively. Crematories were distributed 51 place all over the country and total 265 crematories have been operated in 2000. Korea crematories have been operated 3 steps; incineration, cooling in furnace and collection of bone. This process is similar with Japanese process. But European process is different steps; incineration, keeping the temperature of furnace and collection of bone. In case of Korea, the resynthesis of dioxins in the cooling process due to the dioxin emissions higher than European process. This study has suggested three emission standards of dioxins from crematories based on survey of foreign standards and korean measurement data. The 1st suggested standard is 10 ng-TEQ/Sm3 in present facility, 5 ng-TEQ/Sm3 in new facility, the 2nd suggestion is 5 ng-TEQ/Sm3 in present facility, 1 ng-TEQ/Sm3 in new facility and the 3nd suggestion is 0.5 ng-TEQ/Sm3 in present facility, 0.1 ng-TEQ/Sm3 in new facility. When 2nd suggestion apply, at 2020 dioxin emissions(0.779 g-TEQ/yr) is expected to be approximately 71% reduction compared to 2010 year.

This study aims to monitor the variation of concentration of PCDD/DFs between the gaseous phase-particulate phases in the ambient air of urban area in Korea. This monitoring is evaluated by using the Junge-Pankow model and the Koa absorption model with the application of the Octanol-air partition coefficient. In this study, the ambient air samples were analyzed according to each congener group of the PCDD/DFs by HRGC/HRMS, which have been investigated for the past 5 years. In the results, the annual variation in the concentration level of ∑PCDD/DFs in TSP was increased from 1588 fg/㎥ in 1998 to 5123 fg/㎥ in 2002, and from 31 fg I-TEQ/㎥ to 94 fg I-TEQ/㎥ in the ∑I-TEQ. In the case of PUF of gaseous phase sample, their variation was increased from 1615 fg/㎥ in 1998 to 2237 fg/㎥ in 2002, and in the ∑I-TEQ from 12 fg I-TEQ/㎥ to 17 fg I-TEQ/㎥. The relative coefficient between the gas phase concentration of PCDD/DFs and the temperature was a value of 0.744; the contributive rate of the temperature to the gaseous phase concentration was 0.554. According to the results, the pattern of the coefficient of distribution based on log PL0 is similar to the ambient air of the urban areas.