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Pilot-Plant Study of Wastewater Sludge Decontamination Using a Ferrous Sulfate Bioleaching Process

Guy Mercier, Patrick Drogui, Jean-François Blais and Myriam Chartier
Water Environment Research
Vol. 78, No. 8 (Aug., 2006), pp. 872-879
Stable URL: http://www.jstor.org/stable/25053595
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Pilot-Plant Study of Wastewater Sludge Decontamination Using a Ferrous Sulfate Bioleaching Process
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Abstract

The objective of this research was to investigate the performance of the ferrous sulfate bioleaching (FSBL) process in a pilot plant for decontamination and stabilization of wastewater sludge. Batch and continuous experiments, conducted with two $4\text{-}{\rm m}^{3}$ bioreactors using indigenous iron-oxidizing bacteria (20% v/v of inoculum) with addition of 4.0 g ferrous sulfate heptahydrate per liter of sludge initially acidified to pH 4.0, were sufficient for effective heavy metal (cadmium, copper, manganese, zinc, and lead) removal yields. The average metal removal yields during the FSBL process were as follows: cadmium (69 to 75%), copper (68 to 70%), manganese (72 to 73%), zinc (65 to 66%), and lead (16%). The FSBL process was also found to be effective in removing both fecal and total coliforms (abatement >5 to 6 log units). The nutrients content (nitrogen, phosphorus, and magnesium) were also preserved in decontaminated sludge.

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