Heavy metals mobility in full-scale bioreactor landfill: Initial stage
Resource
Chemosphere 70 (5): 769-777
Journal
Chemosphere
Journal Volume
70
Journal Issue
5
Pages
769-777
Date Issued
2008
Date
2008
Author(s)
Abstract
Selected heavy metals (HMs) including Cd, Cr, Cu, Ni, Pb and Zn initially released from a full-scale bioreactor landfill were monitored over the first 20 months of operation. At the initial landfill stage, the leachate exhibited high HMs release, high organic matter content (27 000-43 000 g l-1 of TOC) and low pH (5-6). By the fifth month of landfilling, the methanogenic stage had been established, and HMs release was reduced below the Chinese National Standards. Total released HMs accounted for less than 1% of landfill deposited during the investigated period. Most landfill HMs were inorganic. Fourier-transform infrared (FT-IR) spectra data and model calculations using Visual MINTEQ indicated that humic substances strongly affected the mobility of organic fractions of HMs in the methanogenic landfill. The initial rates of HMs release could be enhanced by recycling the leachate back to bioreactor landfill, but the total quantity released may be reduced by early establishment of methanogenic stage in bioreactor landfill. © 2007 Elsevier Ltd. All rights reserved.
Subjects
Bioreactor landfill; Heavy metals; Humic substances; Solid-phase fractionation; Visual MINTEQ
Other Subjects
Bioreactors; Fractionation; Heavy metals; Mathematical models; Bioreactor landfill; Humic substances; Solid-phase fractionation; Visual MINTEQ; Land fill; heavy metal; Bioreactors; Fractionation; Heavy metals; Land fill; Mathematical models; bioreactor; FTIR spectroscopy; heavy metal; humic substance; landfill; mobility; recycling; article; bioreactor; chemical model; computer program; concentration (parameters); fractionation; heavy metal removal; humic substance; infrared spectroscopy; landfill; leaching; methanogenic fermentation; pH; solid waste
Type
journal article
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