Mobilisation of trace elements during thermal conversion of algae cultivated in ash dam water

Lane, Daniel J., van Eyk, Philip J., de Nys, Rocky, Roberts, David A., Cole, Andrew J., and Ashman, Peter J. (2015) Mobilisation of trace elements during thermal conversion of algae cultivated in ash dam water. Biomass & Bioenergy, 83. pp. 183-195.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/j.biombioe.201...
 
2
2


Abstract

The work presented here assesses the potential for the mobilisation of 11 trace elements (As, Be, Co, Cu, Mn, Ni, Pb, Sb, Se, V, Zn) during the thermal conversion of micro-and macroalgae that were cultivated in ash dam water. The volatility of the trace elements was quantified by mass balances based on elemental analyses of char and ash residues. The residues were prepared in a laboratory-scale fixed-bed reactor at a range of different temperatures (500-1100 degrees C) and gas atmospheres (N-2, 2% O-2 and CO2) to simulate pyrolysis, combustion and gasification processes. The results showed high volatilities for Se (similar to 79-97%) and As (similar to 51-79%) below 500 degrees C. Zn, Pb and Sb were mainly volatilised above 700 degrees C. The different gas atmospheres had little influence on the volatility of these elements, which increased sharply to more than 90% with increasing temperature from 700 to 1100 degrees C. Volatilities for V, Mn, Cu, Co, Ni and Be were relatively minor over the full range of investigated operating conditions. Samples of each alga and their thermal conversion residues were subject to batch leaching in water. All of the tested trace elements, except for Pb and Be, were partially leached from the algae. Vanadium was up to 4-5 times more leachable in the combustion residues than in the algae. The other trace elements were generally less leachable following thermal conversion. The trace elements were more stable in residues prepared under pyrolysis and gasification conditions than in residues prepared under combustion conditions at the same temperature.

Item ID: 42458
Item Type: Article (Refereed Research - C1)
Keywords: algal biomass, thermal conversion, trace elements, volatilisation, leaching
ISSN: 1873-2909
Funders: Australian Research Council (ARC), SQC Pty Ltd, Australian Renewable Energy Agency (ARENA), Advanced Manufacturing Cooperative Research Centre (AMCRC), MDB Energy
Projects and Grants: ARC Linkage Project LP100200616, ARENA Q00150, ARENA 002369, MDB MACRO Energy Program
Date Deposited: 03 Feb 2016 14:54
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 50%
10 TECHNOLOGY > 1099 Other Technology > 109999 Technology not elsewhere classified @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 50%
96 ENVIRONMENT > 9609 Land and Water Management > 960908 Mining Land and Water Management @ 50%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page