| Title | Enhancing carbon sequestration in soil with coal combustion products: a technology for minimising carbon footprints in coal-power generation and agriculture |
| Publication Type | Journal Article |
| Year of Publication | 2015 |
| Authors | Yunusa I.AM, Blair G., Zerihun A., Yang S.J, Wilson S.C, Young I.M |
| Journal | Climatic Change |
| Volume | 131 |
| Pagination | 559-573 |
| Date Published | Aug |
| Type of Article | Article |
| ISBN Number | 0165-0009 |
| Accession Number | WOS:000358179400008 |
| Keywords | CANOLA, EMISSIONS, FLY-ASH, growth, IMPACT, nitrogen, PH |
| Abstract | Coal-fired power generation and agriculture account for more than half of global greenhouse gas emissions, but the coal fly ash (CFA) produced in the former can be a resource for reducing emissions from agriculture to minimise environmental footprints in both industries. Our aim in this study was to test how acidic and alkaline CFA addition could minimise loss of C and N from acidic soil, with or without added manure. We determined composition and structural characteristics of acidic and alkaline CFA for their capacity to adsorb organic carbon, but observed poor adsorption because of low concentrations of cenospheres and unburnt carbon as the primary absorbents in the ash. Addition of CFA had no impact on the loss of carbon or nitrogen from unmanured soil in which concentrations of these nutrients were low. Loss of carbon from manured soil was reduced by 36 % with alkaline ashes and by 3-fold with acidic ashes; while loss of N was 30-50 % lower with acidic ashes, but 28 % higher with alkaline ashes, compared with no ash treatment. The increases in C sparing with CFA addition were achieved not by direct C absorption but by restraining microbial population and respiration, and potentially emissions. Alkaline CFA increased soil pH and if used to substitute just 10 % of lime for ameliorating soil acidity would reduce CO2 emission associated with the mining of the lime and its eventual dissolution in soil by 2.66 Tg or 2.8 % of Australia's annual agricultural emissions. High concentrations of oxides of phosphorus, silicon, titanium and clay particles in acidic ashes, and oxides of cations in alkaline ashes, were associated with potential for promoting C storage and acidity amelioration in soil.
|
| Short Title | Clim. ChangeClim. Change |
| Alternate Journal | Clim. Change |
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Yunusa, Isa A. M. Blair, Graeme Zerihun, Ayalsew Yang, Shenjiao Wilson, Susan C. Young, Iain M.
ADAA; Australian Research Council [LP0455110]; Ash Development Association of Australia (ADAA); UNE Seed Grant
Cenosphere analyses and adsorption experiments were undertaken by Prof Hongwei Hu, Dr Xiangpeng Gao, Prof Shaobin Wang and their teams at Curtin University; Prof Hu also commented on the manuscript. We acknowledge the assistance of Leanne Leslie, Michael Faint, Jan Carruthers, Gabrielle Ray and Ewan Paterson, and methodology advice by Drs S.M. Rabbi, Rebecca Hailing and V. Manoharan, and Assoc Prof Brian Wilson. We thank the reviewers for their helpful comments, and the power stations and the Ash Development Association of Australia (ADAA) for their support. This study was supported with UNE Seed Grant, and evolved from an earlier project funded by ADAA and the Australian Research Council (LP0455110).
17
22
SPRINGER
DORDRECHT
CLIMATIC CHANGE
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