Increasing plant phosphorus availability in thermally treated sewage sludge by post-process oxidation and particle size management
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Increasing plant phosphorus availability in thermally treated sewage sludge by post-process oxidation and particle size management. / Müller-Stöver, Dorette; Thompson, Rhys; Lu, Changyong; Thomsen, Tobias Pape; Glaesner, Nadia; Bruun, Sander.
In: Waste Management, Vol. 120, 2021, p. 716-724.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Increasing plant phosphorus availability in thermally treated sewage sludge by post-process oxidation and particle size management
AU - Müller-Stöver, Dorette
AU - Thompson, Rhys
AU - Lu, Changyong
AU - Thomsen, Tobias Pape
AU - Glaesner, Nadia
AU - Bruun, Sander
PY - 2021
Y1 - 2021
N2 - Thermal conversion of phosphorus (P)-rich waste materials such as sewage sludge offers several advantages: generation of bioenergy, concentration of plant nutrients and the destruction of organic pollutants. Different thermal processes modify the feedstock's chemical and physical structure in differing ways, which also affects P speciation and plant availability in the residual ashes or carbonization products. This study assessed to which extent the P plant availability of ashes and chars produced from one batch of sewage sludge by incineration, pyrolysis or gasification was affected by particle size management and post-process oxidation. Overall, a smaller particle size of the materials as well as post-process oxidation of non-oxidized materials increased the amount of plant-available P in the soil. In a pot experiment, all the materials increased plant biomass compared with the untreated control, but the pyrolysis chars had a substantially greater fertiliser value than the gasification ashes, while the two tested incineration ashes differed in their P fertilizing effect. P availability in non-oxidized materials was partly related to lower process temperatures and lower levels of crystallinity. However, downstream oxidation simultaneously increased crystallinity and P availability in a pyrolysis char and gasification ashes, resulting in an increase in plant P uptake of up to 60%. Results indicate that the oxidation of poorly soluble Fe-phosphates may contribute to the positive effect on P availability. The results suggest that changes to the design and settings of the thermal conversion processes of sewage sludge offer considerable potential for improving P availability in the residual material. (C) 2020 Elsevier Ltd. All rights reserved.
AB - Thermal conversion of phosphorus (P)-rich waste materials such as sewage sludge offers several advantages: generation of bioenergy, concentration of plant nutrients and the destruction of organic pollutants. Different thermal processes modify the feedstock's chemical and physical structure in differing ways, which also affects P speciation and plant availability in the residual ashes or carbonization products. This study assessed to which extent the P plant availability of ashes and chars produced from one batch of sewage sludge by incineration, pyrolysis or gasification was affected by particle size management and post-process oxidation. Overall, a smaller particle size of the materials as well as post-process oxidation of non-oxidized materials increased the amount of plant-available P in the soil. In a pot experiment, all the materials increased plant biomass compared with the untreated control, but the pyrolysis chars had a substantially greater fertiliser value than the gasification ashes, while the two tested incineration ashes differed in their P fertilizing effect. P availability in non-oxidized materials was partly related to lower process temperatures and lower levels of crystallinity. However, downstream oxidation simultaneously increased crystallinity and P availability in a pyrolysis char and gasification ashes, resulting in an increase in plant P uptake of up to 60%. Results indicate that the oxidation of poorly soluble Fe-phosphates may contribute to the positive effect on P availability. The results suggest that changes to the design and settings of the thermal conversion processes of sewage sludge offer considerable potential for improving P availability in the residual material. (C) 2020 Elsevier Ltd. All rights reserved.
KW - Sewage sludge
KW - Phosphorus fertiliser
KW - Pyrolysis
KW - Gasification
KW - Incineration
KW - TOXIC LEVELS
KW - SOIL
KW - INCINERATION
KW - ASH
KW - PYROLYSIS
KW - RECOVERY
KW - BIOCHAR
KW - BIOAVAILABILITY
KW - GASIFICATION
KW - SPECIATION
U2 - 10.1016/j.wasman.2020.10.034
DO - 10.1016/j.wasman.2020.10.034
M3 - Journal article
C2 - 33199241
VL - 120
SP - 716
EP - 724
JO - Waste Management
JF - Waste Management
SN - 0956-053X
ER -
ID: 255681786