Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge

Part 2: Evaluation of ash materials as phosphorus fertilizer

Bidragets oversatte titel: Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge. Part 2: Evaluation of ash materials as phosphorus fertilizer

Tobias Pape Thomsen, Henrik Hauggaard-Nielsen, Benny Gøbel, Peder Stoholm, Jesper Ahrenfeldt, Ulrik Birk Henriksen, Dorette Sophie Müller-Stöver

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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 100 kW and 6 MW, 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.
OriginalsprogEngelsk
TidsskriftWaste Management
Vol/bind66
Sider (fra-til)145-154
Antal sider9
ISSN0956-053X
StatusUdgivet - 2017

Emneord

  • Fosfor
  • forgasning
  • Spildevandsslam
  • gødning
  • energi-og stofstrømme
  • vedvarende energi
  • landbrug
  • tungmetaller

Citer dette

Thomsen, Tobias Pape ; Hauggaard-Nielsen, Henrik ; Gøbel, Benny ; Stoholm, Peder ; Ahrenfeldt, Jesper ; Henriksen, Ulrik Birk ; Müller-Stöver, Dorette Sophie. / Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge : Part 2: Evaluation of ash materials as phosphorus fertilizer. I: Waste Management. 2017 ; Bind 66. s. 145-154.
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title = "Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge: Part 2: Evaluation of ash materials as phosphorus fertilizer",
abstract = "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 100 kW and 6 MW, 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.",
keywords = "Fosfor, forgasning, Spildevandsslam, g{\o}dning, energi-og stofstr{\o}mme, vedvarende energi, landbrug, tungmetaller, municipal sewage sludge, cereal straw, thermal gasification, phosphorous, fertilizer, heavy metals",
author = "Thomsen, {Tobias Pape} and Henrik Hauggaard-Nielsen and Benny G{\o}bel and Peder Stoholm and Jesper Ahrenfeldt and Henriksen, {Ulrik Birk} and M{\"u}ller-St{\"o}ver, {Dorette Sophie}",
year = "2017",
language = "English",
volume = "66",
pages = "145--154",
journal = "Waste Management",
issn = "0956-053X",
publisher = "Pergamon Press",

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Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge : Part 2: Evaluation of ash materials as phosphorus fertilizer. / Thomsen, Tobias Pape; Hauggaard-Nielsen, Henrik; Gøbel, Benny; Stoholm, Peder; Ahrenfeldt, Jesper; Henriksen, Ulrik Birk; Müller-Stöver, Dorette Sophie.

I: Waste Management, Bind 66, 2017, s. 145-154.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Low temperature circulating fluidized bed gasification and co-gasification of municipal sewage sludge

T2 - Part 2: Evaluation of ash materials as phosphorus fertilizer

AU - Thomsen, Tobias Pape

AU - Hauggaard-Nielsen, Henrik

AU - Gøbel, Benny

AU - Stoholm, Peder

AU - Ahrenfeldt, Jesper

AU - Henriksen, Ulrik Birk

AU - Müller-Stöver, Dorette Sophie

PY - 2017

Y1 - 2017

N2 - 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 100 kW and 6 MW, 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.

AB - 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 100 kW and 6 MW, 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.

KW - Fosfor

KW - forgasning

KW - Spildevandsslam

KW - gødning

KW - energi-og stofstrømme

KW - vedvarende energi

KW - landbrug

KW - tungmetaller

KW - municipal sewage sludge

KW - cereal straw

KW - thermal gasification

KW - phosphorous

KW - fertilizer

KW - heavy metals

M3 - Journal article

VL - 66

SP - 145

EP - 154

JO - Waste Management

JF - Waste Management

SN - 0956-053X

ER -