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Energies 2014, 7(1), 462-476; doi:10.3390/en7010462

Analysis of Organic and Inorganic Contaminants in Dried Sewage Sludge and By-Products of Dried Sewage Sludge Gasification

1
Institute of Thermal Technology, Silesian University of Technology, Gliwice 44-100, Poland
2
Institute of Water and Wastewater Engineering, Silesian University of Technology, Gliwice 44-100, Poland
*
Author to whom correspondence should be addressed.
Received: 26 November 2013 / Revised: 17 January 2014 / Accepted: 17 January 2014 / Published: 22 January 2014
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Abstract

Organic and inorganic contaminants in sewage sludge may cause their presence also in the by-products formed during gasification processes. Thus, this paper presents multidirectional chemical instrumental activation analyses of dried sewage sludge as well as both solid (ash, char coal) and liquid (tar) by-products formed during sewage gasification in a fixed bed reactor which was carried out to assess the extent of that phenomenon. Significant differences were observed in the type of contaminants present in the solid and liquid by-products from the dried sewage sludge gasification. Except for heavy metals, the characteristics of the contaminants in the by-products, irrespective of their form (solid and liquid), were different from those initially determined in the sewage sludge. It has been found that gasification promotes the migration of certain valuable inorganic compounds from sewage sludge into solid by-products which might be recovered. On the other hand, the liquid by-products resulting from sewage sludge gasification require a separate process for their treatment or disposal due to their considerable loading with toxic and hazardous organic compounds (phenols and their derivatives). View Full-Text
Keywords: sewage sludge; gasification; waste by-products; organic and inorganic compounds sewage sludge; gasification; waste by-products; organic and inorganic compounds
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Werle, S.; Dudziak, M. Analysis of Organic and Inorganic Contaminants in Dried Sewage Sludge and By-Products of Dried Sewage Sludge Gasification. Energies 2014, 7, 462-476.

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