Characteristics of selected non-woody invasive alien plants in South Africa and an evaluation of their potential for electricity generation

Mandlakazi Melane, Cori Ham, Martina Meincken

Abstract


Alien invasive plants (AIPs) pose a threat to the existence of plant and animal biodiversity in the ecosystems they invade. They need to be cleared, monitored and eventually eradicated from the landscape. The potential and the economic viability to supply non-woody AIP biomass for electricity generation were assessed in this study, which was conducted on samples from 13 common non-woody AIPs in South Africa, namely: Arundo donax (giant reed), Lantana camara (lantana), Pontederia cordata (pickerel weed), Ricinus communis (castor-oil plant), Opuntia ficus-indica (sweet prickly pear), Solanum mauritianum (bugweed), Atriplex nummularia (saltbush), Cestrum laevigatum (inkberry), Senna didymobotrya (peanut butter cassia), Chromoleana odorata (chromoleana), Eichhornia crassipes (water hyacinth), Cerus jamacaru (queen of the night) and Agave sisilana (sisal plant). Proximate and ultimate analysis was made in order to assess the suitability of the biomass for different thermo-chemical conversion techniques for electricity generation. A financial evaluation of the costs to supply biomass to the plant gate was performed by combining the harvesting, chipping and transport costs. The results showed that the biomass of giant reed, lantana, bugweed, saltbush, inkberry, cassia and Chromoleana may be used to generate electricity through combustion, although the total average cost was approximately 50% higher than that of woody biomass feedstock, requiring a ‘fuel cost subsidy’ to justify their utilisation for energy production.


Keywords


Bio-energy, invasive plants

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References


Ackerman, P., Ham, C., Dovey, S., du Toit, B., de Wet, J., Kunneke, A., Seifert, T., Meincken, M. and von Doderer, C. 2013. State of the art use of forest resi-dues for bioenergy in southern Africa, ICFR Bulletin 03/2013. Institute for Commercial Forestry Research, University of KwaZulu-Natal, Pietermaritzburg, South Africa.

Amaducci, S. and Perego, A. 2015. Field evaluation of Arundo donax clones for bioenergy production. In-dustrial Crops and Products 75: 122–128.

Gorgens, J.F., Carrier, M. and Garcia-Aparicio, M.P. 2014. Biomass quality. In T. Seifert (ed.). Bioenergy from wood: Sustainable production in the tropics, Springer Science and Business Media, Dordrecht: 137–167.

Kitenge, E.M. 2011. Harvesting of invasive wood vegeta-tion (Eucalyptus lehmanii, Leptospermum laeviga-tum, Acacia cyclops) as energy feedstock in the Cape Agulhas plain of South Africa. MSc thesis, University of Stellenbosch, South Africa.

Kolodziej, B., Antonkiewicz, J. and Sugier, D. 2015. Miscanthus×giganteus as a biomass feedstock grown on municipal sewage sludge. Industrial Crops and Products 81:72-82.

Le Maitre, D., Forsyth, G. and Stafford, W. 2011. Inva-sive alien plants biomass assessment. Eskom bio-mass fuel supply study, CSIR version 1.

biochar and bioenergy production. Bi-oresource Technology 140:439–442.

McKendry, P. 2002. Energy production from biomass (part 1): Overview of biomass. Bioresource Technol-ogy 83:37–46.

Meincken, M. 2011. Converting biomass to energy: A South African perspective. Quest 7:4-7.

Meincken, M., Tyhoda, L. 2014. Biomass quality. In T. Seifert (ed.). Bioenergy from wood: Sustainable production in the tropics. Springer Science and Business Media, Dordrecht: 169–184.

Mugido, W., Blignaut, M., De Wet, J., Knipe, A. and Joubert, M. 2014. Determining the feasibility of har-vesting invasive alien plant species for energy. South African Journal of Science 110:1–6.

Munalula, F., Meincken, M. 2009. An evaluation of South African fuelwood with regards to calorific val-ue and environmental impacts. Biomass and Bioen-ergy 33:415–420.

Ofoegbu, C. 2010. An evaluation of the socio-economic impact of timber production with and without the in-clusion of biomass energy production. MSc Thesis, University of Stellenbosch, South Africa.

Pierce, W. 2015. Working for Water IPP procurement programme, techno-economic analysis of biomass to energy projects with alien and invasive species as feedstock. Aurecon South Africa (Pty) Ltd.

Skrifvars, B.J., Lauren, T., Hupa, M., Korbee, R. and Ljung, P. 2004. Ash behaviour in a pulverised wood fired boiler. Fuel 83:1371–1379.

Smit, H.C. 2010. Evaluation of invasive wood species as energy sources. Honours report, Department of For-est and Wood Science, Stellenbosch University, South Africa.

Sokhansanj, S. 2011. The effect of moisture on heating values. In Biomass energy data book, Edition 4, U.S. Department of Energy.

Stahl, R., Henrich, E., Gehrmann, H.J. and Koch, M. 2004. Definition of a standard biomass. RENEW—Renewable Fuels for Advanced Power Trains.

Tanger, P., Field, J.L., Jahn, C.E., De Foort, M.W. and Leach, J.E. 2013. Biomass for thermochemical con-version: targets and challenges. Frontiers in Plant Science 4:1–20.

Von Doderer, C. 2012. Determining sustainable ligno-cellulosic bioenergy systems in the Cape Winelands district municipality, South Africa. PhD thesis, Uni-versity of Stellenbosch, South Africa.

Working for Water 2014. Value added industries’ waste to energy project proposal, Annexure B, version 1.3.

Young, S.L., Gayathri, G. and Keshwani, R.K. 2011. Invasive plant species as potential bioenergy pro-ducers and carbon contributors. Journal of Soil and Water Conservation 66:45-50.




DOI: http://dx.doi.org/10.17159/2413-3051/2017/v28i3a1896

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