Gil-Jong Oh

Analytical method for combustible waste contaminated by the HF leakage from industrial process

Abstract: Hydrofluoric acid (HF), a typical inorganic acid, has been used in the industry for its various usageand classified as the toxic compound, because it can cause the pneumonia and pulmonary edema when it wasexposed to respiratory organs. The official environmental analytical method for fluorine and its compound inwaste has not been developed. For this reason, we have faced some problem to treat the contaminated wastesby the HF leakage from industrial process. In this study, prepared for analytical method for combustible waste(crop, trees, etc.) generated from HF leaking accident and to be applied as the official analytical method forfluorine contaminated waste when the fluorine and its compound will be regulated as a hazardous materialby the waste management law later.요약: 불화수소는 유리의 식각, 금속의 녹 제거 등 산업계에서 많이 사용되는 대표적인 무기산이며 노출 시 눈, 코, 목안을 강하게 자극하고, 흡입 시 폐렴, 폐수종 기관지염을 일으키는 대표적인 유독물질에해당하는 화학물질로 구분되어 있다. 현행 폐기물공정시험기준에는 불소화합물에 대한 함량분석방법이마련되어 있지 않아 최근 발생된 불화수소 누출사고로 발생된 불산에 오염된 농작물, 수목 등 가연성 폐기물의 신속하고 안전한 처리방법 마련에 어려움을 겪었다. 본 연구에서는 불화수소 누출사고로 발생된가연성 폐기물(농작물, 수목 등) 중 불소 및 불소화합물의 함량분석방법 마련을 통해 폐기물의 불산 오염여부를 판단하고 적절한 폐기물 처리방법을 제시하고, 향후 이 방법을 폐기물 관리법상에 지정폐기물에 함유된 유해물질로 불소 및 불소화합물에 대한 항목 추가 시 폐기물공정시험기준으로 활용하고자 한다.Key words: Hydrofluoric acid (HF), leaking accident, combustible waste, analytical method

Content characteristics of persistent organic pollutants waste from paint, iron making and steel making process

This study has been carried out in order to effectively manage three groups of unregulated hazardous organic substances (PCDD/DFs, PAHs, PCBs) in South Korea. The investigated substances have been analyzed according to the test methods for hazardous substances in specified wastes provided by the National Institute of Environmental Research, Korea. Total contents of the organic compounds have been determined for hazardous wastes from three major industrial categories (paint, iron removal, steelmaking), such as waste organic solvent, waste paint or dust. By investigating the waste samples for 7 PAHs using GC/MSD, Naphthalene has been detected (N.D~1631.33 mg/kg). The highest Naphthalene concentration, which exceeded the korean marine dumping waste standard, was found in waste organic solvents and waste paints. Although a content analysis of 7 PCB isomers has been conducted, none of these compounds was detected. The analysis of PCDD/DFs has revealed that all samples meet the criterion for low POP content defined in the technical guidelines developed under the Basel Convention. The PCDD/DFs content in dust samples deriving from 10 manufacturing processes (billet, bloom) was determined to be in the range of N.D~5.66 ng I-TEQ/g waste.

Total content characteristics of inorganic and organic substances from wastes from thermal processes

In this study, heavy metals, PCDD/PCDFs, PAHs in wastes generated from thermal processes were analyzed. Waste from lead thermal metalurgy (EWC 10 04) inorganic metal substances in the regulation were detected in the highest concentrations of Pb. EWC 10 04 seems to be a result of the dust. Waste from zinc thermal metalurgy (EWC 10 05) inorganic metal substances in the regulation were detected in high concentration of Zn. EWC 10 05 seems to be a result of the dust. Waste from copper thermal metalurgy (EWC 10 06) Cu in the 651,77 mg/kg to 651 times higher than regulation standard appeared in the copper thermal metallurgy process seems to be a result of dust. The concentrations of PCDD/PCDFs ranged from 0.0005~11.748 ng-TEQ/ g in dust, 0.0027 ng-TEQ/g in fly ash. PCDD/PCDFs content was not detected in excessive value in regulation

Content and leaching characteristics of non-regulated hazardous substances in waste from the paint industry

This study was performed to investigate the contents and leaching characteristics of hazardous wastes from the paint industry. In order to establish a hazardous waste list, samples from industrial discharge have been analyzed for 8 non-regulated inorganic hazardous substances (i.e., Sb, Ni, F, V, Ba, Zn, Be, Se). In more detail, hazardous waste samples from a total of 64 workplaces, e.g. manufacture, formulation, supply and use (MFSU) of coatings, adhesives, sealants and printing inks processing, have been chosen and analyzed. Contents and leaching tests for inorganic metal species in samples show that the non-regulated hazardous substances satisfy all the criteria, while quantitative analyses reveal that some samples of the discharged wastes exceeded the criteria proposed by NIER (National Instituted of Environmental Research). In conclusion, we expect the outcome of this study to align the classification system of hazardous waste management in South Korea with international legislations, and consequently contribute to reduce environmental pollution as well as health risks by toxic wastes.