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Published online 20 April 2005
Published in J Environ Qual 34:816-824 (2005)
DOI: 10.2134/jeq2004.0307
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Bioproduction of Ferric Sulfate Used during Heavy Metals Removal from Sewage Sludge

Patrick Drogui, Guy Mercier and Jean-François Blais*

Institut National de la recherche scientifique (INRS-Eau, Terre et Environnement), 490, rue de la Couronne, Québec, QC, Canada G1K 9A9



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  		Fig. 1. Hybrid (chemical and biological) leaching process for heavy metals removal from sewage sludge.

 


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  		Fig. 2. Setup of the ferrous sulfate oxidation bioreactor.

 


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  		Fig. 3. Effect of sludge filtrate concentration on oxidation–reduction potential during batch reactors run tests. SSF, sewage sludge filtrate; 9K, synthetic mineral solution.

 


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  		Fig. 4. Effect of sludge filtrate concentration on ferrous ion concentration during batch reactors run tests. SSF, sewage sludge filtrate; 9K, synthetic mineral solution.

 


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  		Fig. 5. Variation in ferric ion concentration during first continuous reactor run tests. Hydraulic retention time = 48 h. SSF, sewage sludge filtrate; 9K, synthetic mineral solution.

 


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  		Fig. 6. Variation in ferric ion concentration during second continuous reactor run tests. Hydraulic retention time = 48 h. SSF, sewage sludge filtrate; 9K, synthetic mineral solution.

 


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  		Fig. 7. Effect of total organic carbon in sludge filtrate on oxidation–reduction potential and Fe(III) measured during continuous reactor run tests.

 




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