Weathering of gasification and grate bottom ash in anaerobic conditions

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Weathering of gasification and grate bottom ash in anaerobic conditions. / Sivula, Leena; Ilander, Aki; Väisänen, Ari; Rintala, Jukka.

julkaisussa: Journal of Hazardous Materials, Vuosikerta 174, Nro 1-3, 15.02.2010, s. 344-351.

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Sivula, Leena ; Ilander, Aki ; Väisänen, Ari ; Rintala, Jukka. / Weathering of gasification and grate bottom ash in anaerobic conditions. Julkaisussa: Journal of Hazardous Materials. 2010 ; Vuosikerta 174, Nro 1-3. Sivut 344-351.

Bibtex - Lataa

@article{b6f3757d53404b4cbc515c89dbe29250,

title = "Weathering of gasification and grate bottom ash in anaerobic conditions",

abstract = "The effect of anaerobic conditions on weathering of gasification and grate bottom ash were studied in laboratory lysimeters. The two parallel lysimeters containing the same ash were run in anaerobic conditions for 322 days, after which one was aerated for 132 days. The lysimeters were watered throughout the study and the quality of leachates and changes in the binding of elements into ash were observed. The results show that organic carbon content and initial moisture of ashes are the key parameters affecting the weathering of ashes. In the grate ash the biodegradation of organic carbon produced enough CO2 to regulate pH. In contrast the dry gasification ash, containing little organic carbon, was not carbonated under anaerobic conditions and the pH decreased only after aeration was started. During the aeration the CO2 absorption capacity was not reached, indicating that intense aeration would be needed to fully carbonate gasification ash. The results indicate that in common weathering practice the main emissions-reducing processes are leaching and carbonation due to CO2 from biodegradation. The results of the aeration study suggest that the role of atmospheric CO2 in the weathering process was insignificant.",

keywords = "Aeration, Anaerobic, Carbonation, Gasification ash, Weathering",

author = "Leena Sivula and Aki Ilander and Ari V{\"a}is{\"a}nen and Jukka Rintala",

year = "2010",

month = "2",

day = "15",

doi = "10.1016/j.jhazmat.2009.09.056",

language = "English",

volume = "174",

pages = "344--351",

journal = "Journal of Hazardous Materials",

issn = "0304-3894",

publisher = "Elsevier",

number = "1-3",

}

RIS (suitable for import to EndNote) - Lataa

TY - JOUR

T1 - Weathering of gasification and grate bottom ash in anaerobic conditions

AU - Sivula, Leena

AU - Ilander, Aki

AU - Väisänen, Ari

AU - Rintala, Jukka

PY - 2010/2/15

Y1 - 2010/2/15

N2 - The effect of anaerobic conditions on weathering of gasification and grate bottom ash were studied in laboratory lysimeters. The two parallel lysimeters containing the same ash were run in anaerobic conditions for 322 days, after which one was aerated for 132 days. The lysimeters were watered throughout the study and the quality of leachates and changes in the binding of elements into ash were observed. The results show that organic carbon content and initial moisture of ashes are the key parameters affecting the weathering of ashes. In the grate ash the biodegradation of organic carbon produced enough CO2 to regulate pH. In contrast the dry gasification ash, containing little organic carbon, was not carbonated under anaerobic conditions and the pH decreased only after aeration was started. During the aeration the CO2 absorption capacity was not reached, indicating that intense aeration would be needed to fully carbonate gasification ash. The results indicate that in common weathering practice the main emissions-reducing processes are leaching and carbonation due to CO2 from biodegradation. The results of the aeration study suggest that the role of atmospheric CO2 in the weathering process was insignificant.

AB - The effect of anaerobic conditions on weathering of gasification and grate bottom ash were studied in laboratory lysimeters. The two parallel lysimeters containing the same ash were run in anaerobic conditions for 322 days, after which one was aerated for 132 days. The lysimeters were watered throughout the study and the quality of leachates and changes in the binding of elements into ash were observed. The results show that organic carbon content and initial moisture of ashes are the key parameters affecting the weathering of ashes. In the grate ash the biodegradation of organic carbon produced enough CO2 to regulate pH. In contrast the dry gasification ash, containing little organic carbon, was not carbonated under anaerobic conditions and the pH decreased only after aeration was started. During the aeration the CO2 absorption capacity was not reached, indicating that intense aeration would be needed to fully carbonate gasification ash. The results indicate that in common weathering practice the main emissions-reducing processes are leaching and carbonation due to CO2 from biodegradation. The results of the aeration study suggest that the role of atmospheric CO2 in the weathering process was insignificant.

KW - Aeration

KW - Anaerobic

KW - Carbonation

KW - Gasification ash

KW - Weathering

U2 - 10.1016/j.jhazmat.2009.09.056

DO - 10.1016/j.jhazmat.2009.09.056

M3 - Article

VL - 174

SP - 344

EP - 351

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

SN - 0304-3894

IS - 1-3

ER -

TUTCRIS