Comparison of phosphorus recovery from incineration and gasification sewage sludge ash

Raimon Parés Viader, Pernille Erland Jensen, Lisbeth M. Ottosen, Tobias Pape Thomsen, Jesper Ahrenfeldt, Henrik Hauggaard-Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ash (SSA), a material which is rich in phosphorus (P), but that it is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock (PR) supply, P recovery from SSA has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms of P extractability using electrodialytic (ED) methods. The results show that comparable recovery rates of P were achieved with a single ED step for incineration SSA and a sequential combination of two ED steps for gasification SSA, which was due to a higher influence of Fe and/or Al in P solubility for the latter. A product with lower level of metallic impurities and comparable to wet process phosphoric acid (WPA) was eventually obtained from gasification SSA. Thus, gasification becomes an interesting alternative to incineration also in terms of P separation.
Original languageEnglish
JournalWater Science and Technology
Volume75
Issue number5
Pages (from-to)1251-1260
ISSN0273-1223
DOIs
Publication statusPublished - 2017

Keywords

  • Electrodialysis
  • Heavy metals
  • Incineration
  • Low-temperature gasification
  • Phosphorus
  • Sewage sludge ash

Cite this

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title = "Comparison of phosphorus recovery from incineration and gasification sewage sludge ash",
abstract = "Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ash (SSA), a material which is rich in phosphorus (P), but that it is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock (PR) supply, P recovery from SSA has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms of P extractability using electrodialytic (ED) methods. The results show that comparable recovery rates of P were achieved with a single ED step for incineration SSA and a sequential combination of two ED steps for gasification SSA, which was due to a higher influence of Fe and/or Al in P solubility for the latter. A product with lower level of metallic impurities and comparable to wet process phosphoric acid (WPA) was eventually obtained from gasification SSA. Thus, gasification becomes an interesting alternative to incineration also in terms of P separation.",
keywords = "Electrodialysis, Heavy metals, Incineration, Low-temperature gasification, Phosphorus, Sewage sludge ash",
author = "{Par{\'e}s Viader}, Raimon and Jensen, {Pernille Erland} and Ottosen, {Lisbeth M.} and Thomsen, {Tobias Pape} and Jesper Ahrenfeldt and Henrik Hauggaard-Nielsen",
year = "2017",
doi = "10.2166/wst.2016.620",
language = "English",
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journal = "Water Science and Technology",
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Comparison of phosphorus recovery from incineration and gasification sewage sludge ash. / Parés Viader, Raimon; Jensen, Pernille Erland; Ottosen, Lisbeth M.; Thomsen, Tobias Pape; Ahrenfeldt, Jesper; Hauggaard-Nielsen, Henrik.

In: Water Science and Technology, Vol. 75, No. 5, 2017, p. 1251-1260.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Comparison of phosphorus recovery from incineration and gasification sewage sludge ash

AU - Parés Viader, Raimon

AU - Jensen, Pernille Erland

AU - Ottosen, Lisbeth M.

AU - Thomsen, Tobias Pape

AU - Ahrenfeldt, Jesper

AU - Hauggaard-Nielsen, Henrik

PY - 2017

Y1 - 2017

N2 - Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ash (SSA), a material which is rich in phosphorus (P), but that it is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock (PR) supply, P recovery from SSA has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms of P extractability using electrodialytic (ED) methods. The results show that comparable recovery rates of P were achieved with a single ED step for incineration SSA and a sequential combination of two ED steps for gasification SSA, which was due to a higher influence of Fe and/or Al in P solubility for the latter. A product with lower level of metallic impurities and comparable to wet process phosphoric acid (WPA) was eventually obtained from gasification SSA. Thus, gasification becomes an interesting alternative to incineration also in terms of P separation.

AB - Incineration of sewage sludge is a common practice in many western countries. Gasification is an attractive option because of its high energy efficiency and flexibility in the usage of the produced gas. However, they both unavoidably produce sewage sludge ash (SSA), a material which is rich in phosphorus (P), but that it is commonly landfilled or used in construction materials. With current uncertainty in phosphate rock (PR) supply, P recovery from SSA has become interesting. In the present work, ashes from incineration and gasification of the same sewage sludge were compared in terms of P extractability using electrodialytic (ED) methods. The results show that comparable recovery rates of P were achieved with a single ED step for incineration SSA and a sequential combination of two ED steps for gasification SSA, which was due to a higher influence of Fe and/or Al in P solubility for the latter. A product with lower level of metallic impurities and comparable to wet process phosphoric acid (WPA) was eventually obtained from gasification SSA. Thus, gasification becomes an interesting alternative to incineration also in terms of P separation.

KW - Electrodialysis

KW - Heavy metals

KW - Incineration

KW - Low-temperature gasification

KW - Phosphorus

KW - Sewage sludge ash

U2 - 10.2166/wst.2016.620

DO - 10.2166/wst.2016.620

M3 - Journal article

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EP - 1260

JO - Water Science and Technology

JF - Water Science and Technology

SN - 0273-1223

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