Effect of pH, Temperature, Dissolved Oxygen, and Flow Rate of Overlying Water on Heavy Metals Release from Storm Sewer SedimentsReportar como inadecuado




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Journal of ChemistryVolume 2013 2013, Article ID 434012, 11 pages

Research Article

School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China

Department of Sustainable City Planning, Beijing Tsinghua Tong Heng Urban Planning and Design Institute, Beijing 100085, China

Received 5 August 2013; Revised 23 September 2013; Accepted 3 November 2013

Academic Editor: Yuangen Yang

Copyright © 2013 Haiyan Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The concentrations and the amount of cumulative release of heavy metals Zn, Cu, Cd, Cr, and Pb in contaminated sediments collected from combined sewer system were investigated in order to provide a complete overview of the key variables affecting the heavy metals release from storm sewer sediments. The heavy metals release rates were affected to a much greater extent in the low pH 4–7 condition than in high pH 8–10 condition. At higher temperature 30–35°C the release rates of metals were increased more rapidly than at low temperature. The release of Zn, Cu, Cr, and Pb appeared to increase under the aerobic condition during the first 150 min and then the concentration kept stable. Moreover, the adsorption of these metals and the release of Cd occurred in the anaerobic condition. The flow rate significantly affected the release amount of Zn, Pb, and Cr, while it slightly affected the concentration of Cu and Cd. This study reflects that any change of pH, temperature, dissolved oxygen, and flow rate of overlying water all cause the different variations of the concentrations of heavy metals.





Autor: Haiyan Li, Anbang Shi, Mingyi Li, and Xiaoran Zhang

Fuente: https://www.hindawi.com/



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