title: Comparison of metal lability in air-dried and fresh dewatered drinking water treatment residuals.
abstract: In this work, the labilities of Al, As, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Mo, Ni, Pb, Sr, V and Zn in air-dried (for 60 days) and fresh dewatered WTRs were compared using the Toxicity Characteristic Leaching Procedure (TCLP), fractionation, in vitro digestion and a plant enrichment test. The results showed that the air-dried and fresh dewatered WTRs had different properties, e.g., organic matter composition and available nutrients. The air-dried and fresh dewatered WTRs were non-haf zardous according to the TCLP assessment method used in the United States; however, the metals in the two types of WTRs had different lability. Compared with the metals in the fresh dewatered WTRs, those in the air-dried WTRs tended to be in more stable fractions and also exhibited lower bioaccessibility and bioavailability. Therefore, air-drying can decrease the metal lability and thereby reduce the potential metal pollution risk of WTRs.
authors.affiliation: a The Key Laboratory of Water and Sediment Sciences, Ministry of Education, School of Environment , Beijing Normal University , Beijing , P. R. China.
authors.forename: Changhui
authors.initials: C
authors.lastname: Wang
authors.forename: Yuansheng
authors.initials: Y
authors.lastname: Pei
authors.forename: Yaqian
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D005591:Chemical Fractionation; D002681:China; D060766:Drinking Water / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry*; D008670:Metals / Q000032:analysis / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D060766:Drinking Water; D008670:Metals; D062065:Wastewater
keywords: Air-drying; drinking water treatment residuals; lability; metal; recycle