국내 축산폐수처리시설의 금속원소 잔류실태 조사
Contamination of Metal Elements in Livestock WastewaterTreatment Plants in Korea
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초록
In this study, quality control was performed to analyze metal elements for sludge and water samples in livestock wastewater treatment plants. The detection and fate of 16 metal elements in influent, sludge and effluent were also evaluated. Method detection limit (MDL) and limit of quantification (LOQ) of target elements for sludge samples were 0.02-0.17 mg/kg and 0.07-0.56 mg/kg, respectively. For water samples, MDL and LOQ were 0.01-0.13 mg/L and 0.03-0.41 mg/L, respectively. Recoveries of metal elements were 67.6-113.6% for sludge samples and 87.7-120.6% for water samples, with a good precision. Metal elements for sludge samples were detected in a broad range. For example, some elements such as Ag, Cd, Co were below the LOQ. The concentrations of Pb, Cr, Cu, and Ni were 9.16-30.42 mg/kg, N.D-22.65 mg/kg, 364.26-1678.81 mg/kg, Ni N.D-32.37 mg/kg, respectively. For water samples, the concentrations of essential elements such as Ca, K, and Na were in the hundreds to thousands of mg/L range. Among some elements detected in the effluent, such as Al, Ca, Cu, Fe, K, Mg, Na, and Zn, the concentrations of regulated elements (Cu and Zn) were below the effluent water quality standards.
Abstract
In this study, quality control was performed to analyze metal elements for sludge and water samples in livestock wastewater treatment plants. The detection and fate of 16 metal elements in influent, sludge and effluent were also evaluated. Method detection limit (MDL) and limit of quantification (LOQ) of target elements for sludge samples were 0.02-0.17 mg/kg and 0.07-0.56 mg/kg, respectively. For water samples, MDL and LOQ were 0.01-0.13 mg/L and 0.03-0.41 mg/L, respectively. Recoveries of metal elements were 67.6-113.6% for sludge samples and 87.7-120.6% for water samples, with a good precision. Metal elements for sludge samples were detected in a broad range. For example, some elements such as Ag, Cd, Co were below the LOQ. The concentrations of Pb, Cr, Cu, and Ni were 9.16-30.42 mg/kg, N.D-22.65 mg/kg, 364.26-1678.81 mg/kg, Ni N.D-32.37 mg/kg, respectively. For water samples, the concentrations of essential elements such as Ca, K, and Na were in the hundreds to thousands of mg/L range. Among some elements detected in the effluent, such as Al, Ca, Cu, Fe, K, Mg, Na, and Zn, the concentrations of regulated elements (Cu and Zn) were below the effluent water quality standards.
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