Element speciation in UK biomass power plant residues based on composition, mineralogy, microstructure and leaching

FUEL

卷:211

Article

Bogush, Anna A.¹  Stegemann, Julia A.¹  Williams, Richard²  Wood, Ian G.³ 

[1] UCL, CREE, Dept Civil Environm & Geomat Engn CEGE, Chadwick Bldg,Gower St, London E1 6QG, England

[2] NERC Ctr Ecol & Hydrol CEH, Maclean Bldg,Benson Lane, Wallingford OX10 8BB, Oxon, England

[3] UCL, Dept Earth Sci, Gower St, London WC1E 6BT, England

关键词: Biomass;    Bottom ash;    Fly ash;    APC residue;    Element speciation;    Leaching;    Phosphorous;    Potassium;    Fertiliser;   

DOI  :  10.1016/j.fuel.2017.09.103

来源: Elsevier

【 摘 要 】

Biomass ash management is an escalating issue in many countries because of increasing numbers of biomass power plants. Comprehensive characterization of biomass ashes with emphasis on element speciation, and solubility of nutrients (e.g., K and P) and pollutants is essential for potential utilization of these residues for soil nutrition. All the UK biomass ashes investigated, whether from combustion of poultry litter, meat and bone meal, and straw, were alkaline and contained high concentrations of P, K, and Ca. The biomass air pollution control (APC) residues were enriched in K, Cl, S and Zn, and contained less lithophile elements, such as Al, Ca, P, Mg, Si, Ti, and Ba, compared to the bottom ashes. P appeared in: 1) bottom ashes as apatite and other phosphates (potassium hydrogen phosphate and potassium iron phosphate in the bottom ashes from combustion of poultry litter); 2) APC residues from combustion of poultry litter as potassium sodium calcium phosphate. K is present mainly in sylvite, arcanite, and some phosphates. Na, K, Cl, and S were easily leached by water from the biomass APC residues. However, water leaching of P, Ca, and Mg was very low, with leaching of P possibly controlled by hydroxyapatite. Aqueous Zn, Cu and Pb appear to prevail in the form of neutral and anionic hydroxide complexes, which are toxic and easily accessible chemical forms for live organisms. Application of the poultry litter bottom ashes as a PK fertiliser in agriculture is appropriate. However, direct application of APC residues to agricultural fields is not appropriate but recovery of K and P from that material should be considered.

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