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• W42972135 abstract "The operation of the core stages of a sediment remediation process - the conditioning of anoxic sludge by plants and the solid-bed leaching of heavy metals using microbially produced sulfuric acid - was tested on a pilot scale using a highly polluted river sediment. Sediment conditioning was performed in 50 m 3 basins at sludge depths of 2 m. During one vegetation period the anoxic dredged sludge turned into a soil-like oxic material and became permeable to water. Reed canary grass (Phalaris arundinacea) was found to be best suited for conditioning. Bioleaching was carried out in an aerated solid- bed reactor with a 2,000 L working volume using soil-like oxic sediment supplemented with 2% sulfur. When applying conditioned sediment, the heat production by microbial oxidation of organic matter increased the temperature up to 50°C, which temporarily inhibited the sulfur-oxidizing bacteria. Under optimum process conditions the heavy metals were solubilized within a few weeks. Zn, Cd, Ni, Co and Mn were leached by up to 80%. Cu was partially dissolved, while Cr and Pb proved nearly immobile. Sediments conditioned by plants and long-term stored oxic sediments were leached with the same efficiency. In total, 60-65% of the heavy metal load was removed after 6 weeks." @default.
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• W42972135 date "2003-01-01" @default.
• W42972135 modified "2023-09-27" @default.
• W42972135 title "A bioremediation process for heavy metal contaminated sediments: efficiency at pilot scale." @default.
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