폐수처리시설에서 발생된 유기성 슬러지에 함유된 다환방향족탄화수소의 농도 특성 = Polycyclic Aromatic Hydrocarbons in Industrial Organic Sludge from Wastewater Treatment Facilities in Korea

국문 초록 (Abstract)

이 연구에서는 우리나라에서 유기성 슬러지의 배출량이 많은 6개 주요 산업 업종의 54개 사업장에서 채취한 98개 폐수처리 슬러지에 대하여 PAHs 함량을 조사하였다. 슬러지에 대한 해양배출허용기준과 비교시 C업종의 슬러지는 Nap에 대하여 제1기준과 제2기준을 모두 초과하는 시료가 1건, PC업종의 슬러지에서 Ant와 Fla에 대하여 제2기준을 초과하는 시료가 1건 있었다. Σ16PAHs는 PC> C > CD> PP >WS > FB업종의 순으로 높았다. 슬러지의 육상 이용시 Σ16PAHs 함량농도를 규제하는 EU와 덴마크의 기준과 비교하였을 때 EU의 기준은 PC업종에서 1건, 덴마크 기준은 C업종과 PC업종에서 각 1건의 시료가 초과하였다. 7종 발암성 PAHs에 대한 Σ7PAHs은 상대적으로 PC, CD, C업종에서 높게, PP, WS업종에서 낮았으며, FB업종에서는 검출되지 않았다. 슬러지에서의 PAHs의 농도에 대한 ANOVA 분석결과 발생업종과 채취시기에 의한 영향은 없는 것으로 나타났다. 개별 PAHs간 상관분석결과 4-ring 이상의 HMW PAHs 농도간에 상관성이 높았다. Σ16PAHs와는 0.7 이상의 높은 상관성을 갖는 PAHs는 Acy, Ant, Fla, B(a)A, B(f)F, B(a)P 이었다. 주성분분석의 결과 98개의 슬러지는 전체 데이터의 약 70%의 설명력을 갖는 두 개의 주성분에 의해 세 개의 그룹으로 특성별로 분리될 수 있었다. 국내/외 선행연구와의 비교 결과 Σ16PAHs는 스위스의 연구 결과와 비슷하였다.

다국어 초록 (Multilingual Abstract)

This study presents the concentrations of the polycyclic aromatic hydrocarbons (PAHs) listed as priority pollutants by United States Environmental Protection Agency (US EPA), in 98 sludges from 54 industrial wastewater treatment facilities of South Korea. The mean concentrations of Σ16PAHs were ranged from 32.5μg/kg-dw to 1189.3μg/kg-dw by industries, and the highest content was found in the petrochemical industry, followed by chemical, clothing manufacturing and dying, pulp and papermaking, secondary wastewater treatment, and food/beverage producing industries. Comparisons to the EU and Danish standards of Σ16PAHs in sewage sludge for land application showed only two samples (one from petrochemical, and the other from chemical industry) exceeded the limits. ANOVA test with PAH concentrations as variables revealed no statistically significant influences by industrial types and sampling time (i.e., seasonal variations). Pearson correlations between individual PAHs showed strong relationships (r>0.7) among 4-ring PAHs. Concentrations of acenaphthylene, anthracene, fluoranthene, benzo(a)anthracene, benzo(f)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene presented strong correlations to Σ16PAHs. Principal component analysis discriminated entire samples into three groups by two principal components (PC1 and PC₂) with 70% of data variations, in which industrial types were not of importance, but a dominance of certain PAHs. Samples in group-I, which is high PC1 and low PC₂, were characterized by a dominance of 2-ring PAHs, and in group-II, PC1 and PC₂ showed a linear relation, was dominant 4-ring PAHs. Group-III with low PC1 and high PC₂ includes 17 samples showing a noticeably high contribution of 3-ring PAHs to Σ16PAHs. This study provides concentrations of PAHs in industrial sludges collected from a wide variety of sources (six industrial types) and two seasons of sampling events, and the comparison of Σ16PAHs with other studies are also discussed.

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