ASSESSMENT OF TOXIC ELEMENTS Cu, Cr, Ni, Pb, Cd, Hg, Zn, As AND HEXAVALENT CHROMIUM IN SEWAGE SLUDGE FROM MUNICIPAL WASTEWATER TREATMENT PLANTS BY COMBINED SPECTROSCOPIC TECHNIQUES

作者：Spanos Thomas^*; Ene Antoaneta; Karadjova Irina B

来源：Romanian Journal of Physics, 2015, 60(1-2): 237-245.

• toxic elements
• Cr(VI)
• sewage sludge
• ICP-AES
• ETAAS
• CVAAS techniques
• Northern Greece

The aim of this study was to determine the concentrations of toxic elements Cu, Cr, Ni, Pb, Cd, Zn, Hg, As and Cr(VI) employing spectroscopic techniques ICP-AES, ETAAS and CVAAS, and to assess the possibility of using the sludge for application on agricultural land. Sewage sludge (n=21 samples) was collected in different seasons in the period 2007-2011 from three municipal wastewater treatment plants (WWTPs) in Northern Greece (Kavala, Drama and Palio). Due to the low concentration values (mg/kg dry matter) found for all the metals (Cd: 0.8-7.3, mean 2.13 +/- 1.61; Cr: 13.2-355, mean 103.8 +/- 100.8; Cr(VI): 0.28-4.30, mean 1.56 +/- 1.32; Cu: 51-198, mean 136.5 +/- 45.5; Hg: <0.2; Ni: 8.8-64, mean 29.2 +/- 15.5; Pb: 12-102, mean 62.0 +/- 23.1, Zn: 810-1880, mean 1256.1 +/- 334.3 and Cr(VI): 0.28-4.3, mean 1.56 +/- 1.32), the sewage sludge produced in the WWTPs of all three cities may be used as fertilizer for agricultural soil according to the European Council Directive 86/278/EEC and Greek legislation 80568/4225/91. Although the As content of sludge is not regulated in Greece, the concentrations found in selected sludge samples (6.3-9.2 mg/kg dry matter) must be corroborated with the As concentration in background soil in case that agricultural disposal of sludge is the chosen route.

• 出版日期2015