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Disinfection of Thickened Sludge and Biosolids Using Ferrate (FeVIO4 2-)

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Sludge in large quantity is generated as byproducts of wastewater treatment processes. For treating the generated sludge, various approaches have been taken, such as land-filling, ocean dumping, or recycling for beneficial purposes. In the US, about 60% of sludge generated is land applied as a soil conditioner or fertilizer. Due to increasing public concern on the safety of land-applied sludge, various sludge treatment technologies to improve the quality of sludge, especially in terms of pathogen content are being developed or under evaluation. This paper evaluates the performance of ferrate [FeVIO4 2-] as a sludge conditioning agent for sludge from disinfection perspective. With its high oxidizing power, it could disinfect wide ranges of microorganisms, i.e., total heterothrophs, enterococci, coliform, fecal coliform, E. coliform, clostridium perfringens and coliphage. At the rate of under 40 mL ferrate/2 Kg thickened sludge, more than 99% destruction of the microorganisms was achieved. Therefore, ferrate as an alternate conditioning agent (or disinfectant) is promising.
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Document Type: Research Article

Publication date: 2005-01-01

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