Abstract
The study assessed the speciation of heavy metals in sewage sludge. Sewage sludge samples were collected from three full-scale sewage treatment plants which employ different treatment processes. Sewage sludge samples from activated sludge process (ASP), UASB reactor (UASBR) and moving bed bioreactor (MBBR), and one anaerobically digested activated sludge (ASP-AD) was collected during different seasons of the year. Modified sequential extraction process was used classifying metals into acid-soluble/exchangeable fraction (F1), reducible fraction (F2), oxidizable fraction (F3) and residual fraction (F4). Five heavy metals, namely chromium, copper, mercury, lead and zinc, were analysed for different fractions. Among the heavy metals, Zn (1317–1448 mg/kg) and Cu (925–1196 mg/kg) contents were the highest, followed by Cr (129–151 mg/kg), Pb (60–86 mg/kg), and Hg (18–34 mg/kg). Concentrations of all heavy metals tested except mercury in MBBR were within the limits set by different agencies.
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Garg, S., Ahammed, M.M., Shaikh, I. (2021). Heavy Metal Fractionation in Aerobic and Anaerobic Sewage Sludge. In: Thomas, J., Jayalekshmi, B., Nagarajan, P. (eds) Current Trends in Civil Engineering . Lecture Notes in Civil Engineering, vol 104. Springer, Singapore. https://doi.org/10.1007/978-981-15-8151-9_2
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