Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge. Part 2: Evaluation of ash materials as phosphorus fertilizer
| Autor: | Dorette Sophie Müller-Stöver, Tobias Pape Thomsen, Peder Stoholm, Henrik Hauggaard-Nielsen, Jesper Ahrenfeldt, Ulrik Birk Henriksen, Benny Gøbel |
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| Rok vydání: | 2017 |
| Předmět: |
020209 energy
Sewage chemistry.chemical_element 02 engineering and technology 010501 environmental sciences engineering.material Phosphorus fertilizer ash Coal Ash 01 natural sciences Thermal gasification 0202 electrical engineering electronic engineering information engineering Fluidized bed combustion Char SDG 2 - Zero Hunger Fertilizers Waste Management and Disposal 0105 earth and related environmental sciences Waste management business.industry Phosphorus Temperature Cereal straw Straw Nitrogen Municipal sewage sludge Heavy metals chemistry engineering Environmental science Fertilizer business Sludge |
| Zdroj: | Thomsen, T P, Hauggaard-Nielsen, H, Gøbel, B, Stoholm, P, Ahrenfeldt, J, Henriksen, U B & Müller-Stöver, D S 2017, ' Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge. Part 2: Evaluation of ash materials as phosphorus fertilizer ', Waste Management, vol. 66, pp. 145-154 . https://doi.org/10.1016/j.wasman.2017.04.043 |
| ISSN: | 0956-053X |
| DOI: | 10.1016/j.wasman.2017.04.043 |
| Popis: | The study is part 2 of 2 in an investigation of gasification and co-gasification of municipal sewage sludge in low temperature gasifiers. In this work, solid residuals from thermal gasification and co-gasification of municipal sewage sludge were investigated for their potential use as fertilizer. Ashes from five different low temperature circulating fluidized bed (LT-CFB) gasification campaigns including two mono-sludge campaigns, two sludge/straw mixed fuels campaigns and a straw reference campaign were compared. Experiments were conducted on two different LT-CFBs with thermal capacities of 100kW and 6MW, respectively. The assessment included: (i) Elemental composition and recovery of key elements and heavy metals; (ii) content of total carbon (C) and total nitrogen (N); (iii) pH; (iv) water extractability of phosphorus after incubation in soil; and (v) plant phosphorus response measured in a pot experiment with the most promising ash material. Co-gasification of straw and sludge in LT-CFB gasifiers produced ashes with a high content of recalcitrant C, phosphorus (P) and potassium (K), a low content of heavy metals (especially cadmium) and an improved plant P availability compared to the mono-sludge ashes, thereby showing the best fertilizer qualities among all assessed materials. It was also found that bottom ashes from the char reactor contained even less heavy metals than cyclone ashes. It is concluded that LT-CFB gasification and co-gasification is a highly effective way to purify and sanitize sewage sludge for subsequent use in agricultural systems. |
| Databáze: | OpenAIRE |
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