광주지역 하수슬러지 중 PAHs 함량 조사 및 유해성 평가 = Investigation of PAH content and hazard assessment in sewage sludge in Gwangju

다국어 초록 (Multilingual Abstract)

In this study, the content of polycyclic aromatic hydrocarbons (PAHs) contained in the sewage sludge generated in Gwangju was investigated. Additionally, the possibility of using the sewage sludge as a resource rather than a waste was confirmed through hazard assessment. The total PAH concentration ranged from 0.66 to 3.73 mg/kg dry weight (d.w.), with a mean concentration of 1.63 mg/ kg d.w. Total PAH concentrations varied significantly with seasonal rainfall and water usage, and the proportion of high molecular weight (HMW)-PAHs was relatively high when affected by wastewater discharged from industrial areas. The source of PAHs was estimated according to the proportion of individual isomers, and it was found that most PAHs were caused by burning fossil fuels or biomass. The PAH concentration in sewage sludge in Gwangju was less than 6 mg/kg, which is the threshold for use on farmland in developed countries, such as countries in Europe. Therefore, the sewage sludge can be used as a resource.