NDLI: Co-Combustion of Municipal Sludge With Wood/Coal in CFB: Enrichment of Phosphorous and Cadmium in Ashes

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	A˚mand, Lars-Erik Leckner, Bo Hansson, Leif Norrlo¨w, Olof
Copyright Year	2003
Abstract	Municipal sludge, originating from two wastewater treatment plants in Sweden, has been burned together with wood pellets or bituminous coal in a circulating fluidised bed (CFB) boiler equipped with a secondary cyclone and bag filter for fly ash removal. Such co-combustion is an alternative to mono-combustion of sludge. The sludge is burned in either mechanically dewatered or pre-dried form. The mechanically dewatered sludge was fed with a pump, but pre-dried sludge could be fed by the fuel feed system normally used for coal. Both types of sludge were burned with either wood-pellets or coal as main fuel under identical operating conditions, typical for a CFB boiler. The focus was on ash balances and on analysis of fuels and ashes to obtain concentrations of relevant species. The presence of phosphorous (P) is of special interest in relation to trace elements, such as mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr), copper (Cu), nickel (Ni) and zinc (Zn). For this reason a comparison has been made between these trace elements and phosphorous in the various ashes and the original sludge as well as other sources of phosphorous that could be used for agricultural purposes. The results show that sewage sludge and fly ash, after combustion of sludge, contain similar amounts of phosphorous as other phosphorous sources for agricultural use, but the levels of trace elements in relation to phosphorous (Hg, Cd, Pb, Cr, Cu) are higher than in animal manure and artificial fertilizer and higher than the present limits in Sweden.
Sponsorship	Advanced Energy Systems
Starting Page	883
Ending Page	908
Page Count	26
File Format	PDF
ISBN	0791836800
DOI	10.1115/FBC2003-098
e-ISBN	0791836754
Conference Proceedings	17th International Conference on Fluidized Bed Combustion
Language	English
Publisher Date	2003-05-18
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Boilers Combustion Fuels Wastewater treatment Fertilizers Fly ash Filters Sewage Pumps Wood products Ash Coal Nickel Co-firing Copper Fluidized beds
Content Type	Text
Resource Type	Article

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