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Feasibility of Recycling Residual Solid from Hydrothermal Treatment of Excess Sludge
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  • Journal title : Environmental Engineering Research
  • Volume 13, Issue 3,  2008, pp.112-118
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2008.13.3.112
 Title & Authors
Feasibility of Recycling Residual Solid from Hydrothermal Treatment of Excess Sludge
Kim, Kyoung-Rean; Fujie, Koichi; Fujisawa, Toshiharu;
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 Abstract
Residual solid in excess sludge treated by hydrothermal reaction was investigated as raw material for its recycling. Treated excess sludge and residual solid were also focused on their content change during hydrothermal reaction. Two kinds of excess sludge, obtained from a local food factory and a municipal wastewater treatment process, were tested under various conditions. Following hydrothermal reaction, depending on the reaction conditions, biodegradable substrates in treated excess sludge appeared to increase. The separated residual solid was a composite composed of organic and inorganic materials. The proportion of carbon varied from 34.0 to 41.6% depending on reaction conditions. Although 1.89% of hazardous materials were detected, SiO2 (Quartz) was a predominant constituent of the residual solid. X-ray diffraction (XRD) experiments revealed that the residual solid was of a partially amorphous state, suggesting that the residual solids could be easily converted to stable and non harmful substances through a stabilization process. Thus, this technology could be successfully used to control excess sludge and its reuse.
 Keywords
Biodegradability improvement;Excess sludge;Hydrothermal reaction;Residual solid;Resource recovery;
 Language
English
 Cited by
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Hydrothermal treatment coupled with mechanical expression at increased temperature for excess sludge dewatering: Heavy metals, volatile organic compounds and combustion characteristics of hydrochar, Chemical Engineering Journal, 2016, 297, 1  crossref(new windwow)
3.
Electrokinetic Separation of Heavy Metals from Wastewater Treatment Sludge, Separation Science and Technology, 2010, 45, 12-13, 1982  crossref(new windwow)
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