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Leaching of phosphorous from ashes of co-combustion of sewage sludge and wood

Anita Pettersson ; Bengt-Åke Andersson ; Britt-Marie Steenari (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Lars-Erik Åmand (Institutionen för energi och miljö, Energiteknik) ; Bo Leckner (Institutionen för energi och miljö, Energiteknik)
In Proceedings of the 18th International Conference on Fluidized Bed Combustion--FBC2005 held in Toronto, Ontario, Canada, May 22-25, 2005 Vol. 18 (2005), p. FBC2005-78017.
[Konferensbidrag, refereegranskat]

Municipal sewage sludge has a high concentration of phosphorus, which should be recovered because phosphorus is a limited natural resource. In this work, sewage sludge was co-fired with wood in a FBC boiler. The aim of the investigating was to study the solubility of phosphorus in the ashes, by leaching as an alternative to the phosphorous recovery method of using the ashes directly on farmlands. The fly ashes from the boiler's secondary cyclone and bag filter were leached at various pH-values and the release of phosphorus was measured. Only acidic leaching was applied. The ashes precipitated with Al2(SO4)3 released nearly all phosphorus at a pH-value of 1, whereas the ashes precipitated with Fe2(SO4)3 did not release all phosphorus even at the very low pH of 0.5. The concentrations of phosphorous in the leachate must be compared with liquid phosphorus sources such as human urine or liquid animal manure used as fertilisers. This may result in that the leachate has to be processed further. A continuation of the work to investigate to what extent the leachate is contami-nated with toxic trace elements is necessary.

Nyckelord: Combustion, phosphorous, leaching sewage sludge, wood


The 18th International Conference on Fluidized Bed Combustion, FBC2005, was held in May 22-25 in Toronto, Ontario, Canada. The proceedings were published electronically (on a CD) by the American Society of Mechanical Engineers, (ASME). The conference was sponsored by ASME, CANMET Energy Technology Centre-Ottawa (CETC-Ottawa), Alstom Power Inc, Austrian Energy and Environment AG and Greenfield Research. Lufei Jia from CETC-Ottawa was the conference Chairman.



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Denna post skapades 2006-08-25. Senast ändrad 2016-08-15.
CPL Pubid: 7070

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för energi och miljö, Energiteknik

Ämnesområden

Energi
Hållbar utveckling
Termisk energiteknik
Miljöteknik

Chalmers infrastruktur

Chalmers Kraftcentral (CK)