Title: Global supply of freshwater: the role of treatment wetlands

Authors: Lauchlan H. Fraser, Mark E. Bradford, David N. Steer

Addresses: Department of Biology, University of Akron, Akron, OH 44325-3908, USA. Department of Biology, University of Akron, Akron, OH 44325-3908, USA. Department of Geology, University of Akron, Akron, OH 44325-4101, USA

Abstract: In 2000, humans used approximately 60% of run-off that is geographically and temporally accessible. With projected increases in population, humans may use between 72-99% (depending on whether per capita increases are factored) of accessible run-off by 2025, even accounting for new dam construction. Wetlands have the capability to filter polluted water and could therefore potentially affect access to freshwater. Based on an estimated 2507 km³/year of total wastewater produced in 2025 and a standard flow rate of wastewater at 5 cm/day, our model predicts that the construction of 171,114 km² of treatment wetlands can potentially reduce human appropriation of annual run-off to 64% by 2025, with additional freshwater returns of up to 23% of annual run-off.

Keywords: wastewater treatment; constructed wetland; global model.

DOI: 10.1504/IJESD.2003.003327

International Journal of Environment and Sustainable Development, 2003 Vol.2 No.2, pp.174 - 183

Published online: 28 Aug 2003 *

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